newgrf.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
 
#include <stdarg.h>
 
#include "debug.h"
#include "fileio_func.h"
#include "engine_func.h"
#include "engine_base.h"
#include "bridge.h"
#include "town.h"
#include "newgrf_engine.h"
#include "newgrf_text.h"
#include "fontcache.h"
#include "currency.h"
#include "landscape.h"
#include "newgrf_cargo.h"
#include "newgrf_house.h"
#include "newgrf_sound.h"
#include "newgrf_station.h"
#include "industrytype.h"
#include "industry_map.h"
#include "newgrf_canal.h"
#include "newgrf_townname.h"
#include "newgrf_industries.h"
#include "newgrf_airporttiles.h"
#include "newgrf_airport.h"
#include "newgrf_object.h"
#include "rev.h"
#include "fios.h"
#include "strings_func.h"
#include "date_func.h"
#include "string_func.h"
#include "network/core/config.h"
#include <map>
#include "smallmap_gui.h"
#include "genworld.h"
#include "error.h"
#include "vehicle_func.h"
#include "language.h"
#include "vehicle_base.h"
#include "road.h"
 
#include "table/strings.h"
#include "table/build_industry.h"
 
#include "safeguards.h"
 
/* TTDPatch extended GRF format codec
 * (c) Petr Baudis 2004 (GPL'd)
 * Changes by Florian octo Forster are (c) by the OpenTTD development team.
 *
 * Contains portions of documentation by TTDPatch team.
 * Thanks especially to Josef Drexler for the documentation as well as a lot
 * of help at #tycoon. Also thanks to Michael Blunck for his GRF files which
 * served as subject to the initial testing of this codec. */
 
static std::vector<GRFFile *> _grf_files;
 
const std::vector<GRFFile *> &GetAllGRFFiles()
{
  return _grf_files;
}
 
byte _misc_grf_features = 0;
 
static uint32 _ttdpatch_flags[8];
 
GRFLoadedFeatures _loaded_newgrf_features;
 
static const uint MAX_SPRITEGROUP = UINT8_MAX; 
 
struct GrfProcessingState {
private:
  struct SpriteSet {
    SpriteID sprite;  
    uint num_sprites; 
  };
 
  std::map<uint, SpriteSet> spritesets[GSF_END];
 
public:
  /* Global state */
  GrfLoadingStage stage;    
  SpriteID spriteid;        
 
  /* Local state in the file */
  SpriteFile *file;         
  GRFFile *grffile;         
  GRFConfig *grfconfig;     
  uint32 nfo_line;          
 
  /* Kind of return values when processing certain actions */
  int skip_sprites;         
 
  /* Currently referenceable spritegroups */
  const SpriteGroup *spritegroups[MAX_SPRITEGROUP + 1];
 
  void ClearDataForNextFile()
  {
    this->nfo_line = 0;
    this->skip_sprites = 0;
 
    for (uint i = 0; i < GSF_END; i++) {
      this->spritesets[i].clear();
    }
 
    memset(this->spritegroups, 0, sizeof(this->spritegroups));
  }
 
  void AddSpriteSets(byte feature, SpriteID first_sprite, uint first_set, uint numsets, uint numents)
  {
    assert(feature < GSF_END);
    for (uint i = 0; i < numsets; i++) {
      SpriteSet &set = this->spritesets[feature][first_set + i];
      set.sprite = first_sprite + i * numents;
      set.num_sprites = numents;
    }
  }
 
  bool HasValidSpriteSets(byte feature) const
  {
    assert(feature < GSF_END);
    return !this->spritesets[feature].empty();
  }
 
  bool IsValidSpriteSet(byte feature, uint set) const
  {
    assert(feature < GSF_END);
    return this->spritesets[feature].find(set) != this->spritesets[feature].end();
  }
 
  SpriteID GetSprite(byte feature, uint set) const
  {
    assert(IsValidSpriteSet(feature, set));
    return this->spritesets[feature].find(set)->second.sprite;
  }
 
  uint GetNumEnts(byte feature, uint set) const
  {
    assert(IsValidSpriteSet(feature, set));
    return this->spritesets[feature].find(set)->second.num_sprites;
  }
};
 
static GrfProcessingState _cur;
 
 
template <VehicleType T>
static inline bool IsValidNewGRFImageIndex(uint8 image_index)
{
  return image_index == 0xFD || IsValidImageIndex<T>(image_index);
}
 
class OTTDByteReaderSignal { };
 
class ByteReader {
protected:
  byte *data;
  byte *end;
 
public:
  ByteReader(byte *data, byte *end) : data(data), end(end) { }
 
  inline byte *ReadBytes(size_t size)
  {
    if (data + size >= end) {
      /* Put data at the end, as would happen if every byte had been individually read. */
      data = end;
      throw OTTDByteReaderSignal();
    }
 
    byte *ret = data;
    data += size;
    return ret;
  }
 
  inline byte ReadByte()
  {
    if (data < end) return *(data)++;
    throw OTTDByteReaderSignal();
  }
 
  uint16 ReadWord()
  {
    uint16 val = ReadByte();
    return val | (ReadByte() << 8);
  }
 
  uint16 ReadExtendedByte()
  {
    uint16 val = ReadByte();
    return val == 0xFF ? ReadWord() : val;
  }
 
  uint32 ReadDWord()
  {
    uint32 val = ReadWord();
    return val | (ReadWord() << 16);
  }
 
  uint32 ReadVarSize(byte size)
  {
    switch (size) {
      case 1: return ReadByte();
      case 2: return ReadWord();
      case 4: return ReadDWord();
      default:
        NOT_REACHED();
        return 0;
    }
  }
 
  const char *ReadString()
  {
    char *string = reinterpret_cast<char *>(data);
    size_t string_length = ttd_strnlen(string, Remaining());
 
    if (string_length == Remaining()) {
      /* String was not NUL terminated, so make sure it is now. */
      string[string_length - 1] = '\0';
      grfmsg(7, "String was not terminated with a zero byte.");
    } else {
      /* Increase the string length to include the NUL byte. */
      string_length++;
    }
    Skip(string_length);
 
    return string;
  }
 
  inline size_t Remaining() const
  {
    return end - data;
  }
 
  inline bool HasData(size_t count = 1) const
  {
    return data + count <= end;
  }
 
  inline byte *Data()
  {
    return data;
  }
 
  inline void Skip(size_t len)
  {
    data += len;
    /* It is valid to move the buffer to exactly the end of the data,
     * as there may not be any more data read. */
    if (data > end) throw OTTDByteReaderSignal();
  }
};
 
typedef void (*SpecialSpriteHandler)(ByteReader *buf);
 
static const uint NUM_STATIONS_PER_GRF = 255; 
 
struct GRFTempEngineData {
  enum Refittability {
    UNSET    =  0,  
    EMPTY,          
    NONEMPTY,       
  };
 
  uint16 cargo_allowed;
  uint16 cargo_disallowed;
  RailTypeLabel railtypelabel;
  uint8 roadtramtype;
  const GRFFile *defaultcargo_grf; 
  Refittability refittability;     
  uint8 rv_max_speed;      
  CargoTypes ctt_include_mask; 
  CargoTypes ctt_exclude_mask; 
 
  void UpdateRefittability(bool non_empty)
  {
    if (non_empty) {
      this->refittability = NONEMPTY;
    } else if (this->refittability == UNSET) {
      this->refittability = EMPTY;
    }
  }
};
 
static GRFTempEngineData *_gted;  
 
static uint32 _grm_engines[256];
 
static uint32 _grm_cargoes[NUM_CARGO * 2];
 
struct GRFLocation {
  uint32 grfid;
  uint32 nfoline;
 
  GRFLocation(uint32 grfid, uint32 nfoline) : grfid(grfid), nfoline(nfoline) { }
 
  bool operator<(const GRFLocation &other) const
  {
    return this->grfid < other.grfid || (this->grfid == other.grfid && this->nfoline < other.nfoline);
  }
 
  bool operator == (const GRFLocation &other) const
  {
    return this->grfid == other.grfid && this->nfoline == other.nfoline;
  }
};
 
static std::map<GRFLocation, SpriteID> _grm_sprites;
typedef std::map<GRFLocation, byte*> GRFLineToSpriteOverride;
static GRFLineToSpriteOverride _grf_line_to_action6_sprite_override;
 
void CDECL grfmsg(int severity, const char *str, ...)
{
  char buf[1024];
  va_list va;
 
  va_start(va, str);
  vseprintf(buf, lastof(buf), str, va);
  va_end(va);
 
  Debug(grf, severity, "[{}:{}] {}", _cur.grfconfig->filename, _cur.nfo_line, buf);
}
 
static GRFFile *GetFileByGRFID(uint32 grfid)
{
  for (GRFFile * const file : _grf_files) {
    if (file->grfid == grfid) return file;
  }
  return nullptr;
}
 
static GRFFile *GetFileByFilename(const char *filename)
{
  for (GRFFile * const file : _grf_files) {
    if (strcmp(file->filename, filename) == 0) return file;
  }
  return nullptr;
}
 
static void ClearTemporaryNewGRFData(GRFFile *gf)
{
  gf->labels.clear();
}
 
static GRFError *DisableGrf(StringID message = STR_NULL, GRFConfig *config = nullptr)
{
  GRFFile *file;
  if (config != nullptr) {
    file = GetFileByGRFID(config->ident.grfid);
  } else {
    config = _cur.grfconfig;
    file = _cur.grffile;
  }
 
  config->status = GCS_DISABLED;
  if (file != nullptr) ClearTemporaryNewGRFData(file);
  if (config == _cur.grfconfig) _cur.skip_sprites = -1;
 
  if (message != STR_NULL) {
    delete config->error;
    config->error = new GRFError(STR_NEWGRF_ERROR_MSG_FATAL, message);
    if (config == _cur.grfconfig) config->error->param_value[0] = _cur.nfo_line;
  }
 
  return config->error;
}
 
struct StringIDMapping {
  uint32 grfid;     
  StringID source;  
  StringID *target; 
};
typedef std::vector<StringIDMapping> StringIDMappingVector;
static StringIDMappingVector _string_to_grf_mapping;
 
static void AddStringForMapping(StringID source, StringID *target)
{
  *target = STR_UNDEFINED;
  _string_to_grf_mapping.push_back({_cur.grffile->grfid, source, target});
}
 
static StringID TTDPStringIDToOTTDStringIDMapping(StringID str)
{
  /* StringID table for TextIDs 0x4E->0x6D */
  static const StringID units_volume[] = {
    STR_ITEMS,      STR_PASSENGERS, STR_TONS,       STR_BAGS,
    STR_LITERS,     STR_ITEMS,      STR_CRATES,     STR_TONS,
    STR_TONS,       STR_TONS,       STR_TONS,       STR_BAGS,
    STR_TONS,       STR_TONS,       STR_TONS,       STR_BAGS,
    STR_TONS,       STR_TONS,       STR_BAGS,       STR_LITERS,
    STR_TONS,       STR_LITERS,     STR_TONS,       STR_ITEMS,
    STR_BAGS,       STR_LITERS,     STR_TONS,       STR_ITEMS,
    STR_TONS,       STR_ITEMS,      STR_LITERS,     STR_ITEMS
  };
 
  /* A string straight from a NewGRF; this was already translated by MapGRFStringID(). */
  assert(!IsInsideMM(str, 0xD000, 0xD7FF));
 
#define TEXTID_TO_STRINGID(begin, end, stringid, stringend) \
  static_assert(stringend - stringid == end - begin); \
  if (str >= begin && str <= end) return str + (stringid - begin)
 
  /* We have some changes in our cargo strings, resulting in some missing. */
  TEXTID_TO_STRINGID(0x000E, 0x002D, STR_CARGO_PLURAL_NOTHING,                      STR_CARGO_PLURAL_FIZZY_DRINKS);
  TEXTID_TO_STRINGID(0x002E, 0x004D, STR_CARGO_SINGULAR_NOTHING,                    STR_CARGO_SINGULAR_FIZZY_DRINK);
  if (str >= 0x004E && str <= 0x006D) return units_volume[str - 0x004E];
  TEXTID_TO_STRINGID(0x006E, 0x008D, STR_QUANTITY_NOTHING,                          STR_QUANTITY_FIZZY_DRINKS);
  TEXTID_TO_STRINGID(0x008E, 0x00AD, STR_ABBREV_NOTHING,                            STR_ABBREV_FIZZY_DRINKS);
  TEXTID_TO_STRINGID(0x00D1, 0x00E0, STR_COLOUR_DARK_BLUE,                          STR_COLOUR_WHITE);
 
  /* Map building names according to our lang file changes. There are several
   * ranges of house ids, all of which need to be remapped to allow newgrfs
   * to use original house names. */
  TEXTID_TO_STRINGID(0x200F, 0x201F, STR_TOWN_BUILDING_NAME_TALL_OFFICE_BLOCK_1,    STR_TOWN_BUILDING_NAME_OLD_HOUSES_1);
  TEXTID_TO_STRINGID(0x2036, 0x2041, STR_TOWN_BUILDING_NAME_COTTAGES_1,             STR_TOWN_BUILDING_NAME_SHOPPING_MALL_1);
  TEXTID_TO_STRINGID(0x2059, 0x205C, STR_TOWN_BUILDING_NAME_IGLOO_1,                STR_TOWN_BUILDING_NAME_PIGGY_BANK_1);
 
  /* Same thing for industries */
  TEXTID_TO_STRINGID(0x4802, 0x4826, STR_INDUSTRY_NAME_COAL_MINE,                   STR_INDUSTRY_NAME_SUGAR_MINE);
  TEXTID_TO_STRINGID(0x482D, 0x482E, STR_NEWS_INDUSTRY_CONSTRUCTION,                STR_NEWS_INDUSTRY_PLANTED);
  TEXTID_TO_STRINGID(0x4832, 0x4834, STR_NEWS_INDUSTRY_CLOSURE_GENERAL,             STR_NEWS_INDUSTRY_CLOSURE_LACK_OF_TREES);
  TEXTID_TO_STRINGID(0x4835, 0x4838, STR_NEWS_INDUSTRY_PRODUCTION_INCREASE_GENERAL, STR_NEWS_INDUSTRY_PRODUCTION_INCREASE_FARM);
  TEXTID_TO_STRINGID(0x4839, 0x483A, STR_NEWS_INDUSTRY_PRODUCTION_DECREASE_GENERAL, STR_NEWS_INDUSTRY_PRODUCTION_DECREASE_FARM);
 
  switch (str) {
    case 0x4830: return STR_ERROR_CAN_T_CONSTRUCT_THIS_INDUSTRY;
    case 0x4831: return STR_ERROR_FOREST_CAN_ONLY_BE_PLANTED;
    case 0x483B: return STR_ERROR_CAN_ONLY_BE_POSITIONED;
  }
#undef TEXTID_TO_STRINGID
 
  if (str == STR_NULL) return STR_EMPTY;
 
  Debug(grf, 0, "Unknown StringID 0x{:04X} remapped to STR_EMPTY. Please open a Feature Request if you need it", str);
 
  return STR_EMPTY;
}
 
StringID MapGRFStringID(uint32 grfid, StringID str)
{
  if (IsInsideMM(str, 0xD800, 0xE000)) {
    /* General text provided by NewGRF.
     * In the specs this is called the 0xDCxx range (misc persistent texts),
     * but we meanwhile extended the range to 0xD800-0xDFFF.
     * Note: We are not involved in the "persistent" business, since we do not store
     * any NewGRF strings in savegames. */
    return GetGRFStringID(grfid, str);
  } else if (IsInsideMM(str, 0xD000, 0xD800)) {
    /* Callback text provided by NewGRF.
     * In the specs this is called the 0xD0xx range (misc graphics texts).
     * These texts can be returned by various callbacks.
     *
     * Due to how TTDP implements the GRF-local- to global-textid translation
     * texts included via 0x80 or 0x81 control codes have to add 0x400 to the textid.
     * We do not care about that difference and just mask out the 0x400 bit.
     */
    str &= ~0x400;
    return GetGRFStringID(grfid, str);
  } else {
    /* The NewGRF wants to include/reference an original TTD string.
     * Try our best to find an equivalent one. */
    return TTDPStringIDToOTTDStringIDMapping(str);
  }
}
 
static std::map<uint32, uint32> _grf_id_overrides;
 
static void SetNewGRFOverride(uint32 source_grfid, uint32 target_grfid)
{
  _grf_id_overrides[source_grfid] = target_grfid;
  grfmsg(5, "SetNewGRFOverride: Added override of 0x%X to 0x%X", BSWAP32(source_grfid), BSWAP32(target_grfid));
}
 
static Engine *GetNewEngine(const GRFFile *file, VehicleType type, uint16 internal_id, bool static_access = false)
{
  /* Hack for add-on GRFs that need to modify another GRF's engines. This lets
   * them use the same engine slots. */
  uint32 scope_grfid = INVALID_GRFID; // If not using dynamic_engines, all newgrfs share their ID range
  if (_settings_game.vehicle.dynamic_engines) {
    /* If dynamic_engies is enabled, there can be multiple independent ID ranges. */
    scope_grfid = file->grfid;
    uint32 override = _grf_id_overrides[file->grfid];
    if (override != 0) {
      scope_grfid = override;
      const GRFFile *grf_match = GetFileByGRFID(override);
      if (grf_match == nullptr) {
        grfmsg(5, "Tried mapping from GRFID %x to %x but target is not loaded", BSWAP32(file->grfid), BSWAP32(override));
      } else {
        grfmsg(5, "Mapping from GRFID %x to %x", BSWAP32(file->grfid), BSWAP32(override));
      }
    }
 
    /* Check if the engine is registered in the override manager */
    EngineID engine = _engine_mngr.GetID(type, internal_id, scope_grfid);
    if (engine != INVALID_ENGINE) {
      Engine *e = Engine::Get(engine);
      if (e->grf_prop.grffile == nullptr) e->grf_prop.grffile = file;
      return e;
    }
  }
 
  /* Check if there is an unreserved slot */
  EngineID engine = _engine_mngr.GetID(type, internal_id, INVALID_GRFID);
  if (engine != INVALID_ENGINE) {
    Engine *e = Engine::Get(engine);
 
    if (e->grf_prop.grffile == nullptr) {
      e->grf_prop.grffile = file;
      grfmsg(5, "Replaced engine at index %d for GRFID %x, type %d, index %d", e->index, BSWAP32(file->grfid), type, internal_id);
    }
 
    /* Reserve the engine slot */
    if (!static_access) {
      EngineIDMapping *eid = _engine_mngr.data() + engine;
      eid->grfid           = scope_grfid; // Note: this is INVALID_GRFID if dynamic_engines is disabled, so no reservation
    }
 
    return e;
  }
 
  if (static_access) return nullptr;
 
  if (!Engine::CanAllocateItem()) {
    grfmsg(0, "Can't allocate any more engines");
    return nullptr;
  }
 
  size_t engine_pool_size = Engine::GetPoolSize();
 
  /* ... it's not, so create a new one based off an existing engine */
  Engine *e = new Engine(type, internal_id);
  e->grf_prop.grffile = file;
 
  /* Reserve the engine slot */
  assert(_engine_mngr.size() == e->index);
  _engine_mngr.push_back({
      scope_grfid, // Note: this is INVALID_GRFID if dynamic_engines is disabled, so no reservation
      internal_id,
      type,
      std::min<uint8>(internal_id, _engine_counts[type]) // substitute_id == _engine_counts[subtype] means "no substitute"
  });
 
  if (engine_pool_size != Engine::GetPoolSize()) {
    /* Resize temporary engine data ... */
    _gted = ReallocT(_gted, Engine::GetPoolSize());
 
    /* and blank the new block. */
    size_t len = (Engine::GetPoolSize() - engine_pool_size) * sizeof(*_gted);
    memset(_gted + engine_pool_size, 0, len);
  }
  if (type == VEH_TRAIN) {
    _gted[e->index].railtypelabel = GetRailTypeInfo(e->u.rail.railtype)->label;
  }
 
  grfmsg(5, "Created new engine at index %d for GRFID %x, type %d, index %d", e->index, BSWAP32(file->grfid), type, internal_id);
 
  return e;
}
 
EngineID GetNewEngineID(const GRFFile *file, VehicleType type, uint16 internal_id)
{
  uint32 scope_grfid = INVALID_GRFID; // If not using dynamic_engines, all newgrfs share their ID range
  if (_settings_game.vehicle.dynamic_engines) {
    scope_grfid = file->grfid;
    uint32 override = _grf_id_overrides[file->grfid];
    if (override != 0) scope_grfid = override;
  }
 
  return _engine_mngr.GetID(type, internal_id, scope_grfid);
}
 
static void MapSpriteMappingRecolour(PalSpriteID *grf_sprite)
{
  if (HasBit(grf_sprite->pal, 14)) {
    ClrBit(grf_sprite->pal, 14);
    SetBit(grf_sprite->sprite, SPRITE_MODIFIER_OPAQUE);
  }
 
  if (HasBit(grf_sprite->sprite, 14)) {
    ClrBit(grf_sprite->sprite, 14);
    SetBit(grf_sprite->sprite, PALETTE_MODIFIER_TRANSPARENT);
  }
 
  if (HasBit(grf_sprite->sprite, 15)) {
    ClrBit(grf_sprite->sprite, 15);
    SetBit(grf_sprite->sprite, PALETTE_MODIFIER_COLOUR);
  }
}
 
static TileLayoutFlags ReadSpriteLayoutSprite(ByteReader *buf, bool read_flags, bool invert_action1_flag, bool use_cur_spritesets, int feature, PalSpriteID *grf_sprite, uint16 *max_sprite_offset = nullptr, uint16 *max_palette_offset = nullptr)
{
  grf_sprite->sprite = buf->ReadWord();
  grf_sprite->pal = buf->ReadWord();
  TileLayoutFlags flags = read_flags ? (TileLayoutFlags)buf->ReadWord() : TLF_NOTHING;
 
  MapSpriteMappingRecolour(grf_sprite);
 
  bool custom_sprite = HasBit(grf_sprite->pal, 15) != invert_action1_flag;
  ClrBit(grf_sprite->pal, 15);
  if (custom_sprite) {
    /* Use sprite from Action 1 */
    uint index = GB(grf_sprite->sprite, 0, 14);
    if (use_cur_spritesets && (!_cur.IsValidSpriteSet(feature, index) || _cur.GetNumEnts(feature, index) == 0)) {
      grfmsg(1, "ReadSpriteLayoutSprite: Spritelayout uses undefined custom spriteset %d", index);
      grf_sprite->sprite = SPR_IMG_QUERY;
      grf_sprite->pal = PAL_NONE;
    } else {
      SpriteID sprite = use_cur_spritesets ? _cur.GetSprite(feature, index) : index;
      if (max_sprite_offset != nullptr) *max_sprite_offset = use_cur_spritesets ? _cur.GetNumEnts(feature, index) : UINT16_MAX;
      SB(grf_sprite->sprite, 0, SPRITE_WIDTH, sprite);
      SetBit(grf_sprite->sprite, SPRITE_MODIFIER_CUSTOM_SPRITE);
    }
  } else if ((flags & TLF_SPRITE_VAR10) && !(flags & TLF_SPRITE_REG_FLAGS)) {
    grfmsg(1, "ReadSpriteLayoutSprite: Spritelayout specifies var10 value for non-action-1 sprite");
    DisableGrf(STR_NEWGRF_ERROR_INVALID_SPRITE_LAYOUT);
    return flags;
  }
 
  if (flags & TLF_CUSTOM_PALETTE) {
    /* Use palette from Action 1 */
    uint index = GB(grf_sprite->pal, 0, 14);
    if (use_cur_spritesets && (!_cur.IsValidSpriteSet(feature, index) || _cur.GetNumEnts(feature, index) == 0)) {
      grfmsg(1, "ReadSpriteLayoutSprite: Spritelayout uses undefined custom spriteset %d for 'palette'", index);
      grf_sprite->pal = PAL_NONE;
    } else {
      SpriteID sprite = use_cur_spritesets ? _cur.GetSprite(feature, index) : index;
      if (max_palette_offset != nullptr) *max_palette_offset = use_cur_spritesets ? _cur.GetNumEnts(feature, index) : UINT16_MAX;
      SB(grf_sprite->pal, 0, SPRITE_WIDTH, sprite);
      SetBit(grf_sprite->pal, SPRITE_MODIFIER_CUSTOM_SPRITE);
    }
  } else if ((flags & TLF_PALETTE_VAR10) && !(flags & TLF_PALETTE_REG_FLAGS)) {
    grfmsg(1, "ReadSpriteLayoutRegisters: Spritelayout specifies var10 value for non-action-1 palette");
    DisableGrf(STR_NEWGRF_ERROR_INVALID_SPRITE_LAYOUT);
    return flags;
  }
 
  return flags;
}
 
static void ReadSpriteLayoutRegisters(ByteReader *buf, TileLayoutFlags flags, bool is_parent, NewGRFSpriteLayout *dts, uint index)
{
  if (!(flags & TLF_DRAWING_FLAGS)) return;
 
  if (dts->registers == nullptr) dts->AllocateRegisters();
  TileLayoutRegisters &regs = const_cast<TileLayoutRegisters&>(dts->registers[index]);
  regs.flags = flags & TLF_DRAWING_FLAGS;
 
  if (flags & TLF_DODRAW)  regs.dodraw  = buf->ReadByte();
  if (flags & TLF_SPRITE)  regs.sprite  = buf->ReadByte();
  if (flags & TLF_PALETTE) regs.palette = buf->ReadByte();
 
  if (is_parent) {
    if (flags & TLF_BB_XY_OFFSET) {
      regs.delta.parent[0] = buf->ReadByte();
      regs.delta.parent[1] = buf->ReadByte();
    }
    if (flags & TLF_BB_Z_OFFSET)    regs.delta.parent[2] = buf->ReadByte();
  } else {
    if (flags & TLF_CHILD_X_OFFSET) regs.delta.child[0]  = buf->ReadByte();
    if (flags & TLF_CHILD_Y_OFFSET) regs.delta.child[1]  = buf->ReadByte();
  }
 
  if (flags & TLF_SPRITE_VAR10) {
    regs.sprite_var10 = buf->ReadByte();
    if (regs.sprite_var10 > TLR_MAX_VAR10) {
      grfmsg(1, "ReadSpriteLayoutRegisters: Spritelayout specifies var10 (%d) exceeding the maximal allowed value %d", regs.sprite_var10, TLR_MAX_VAR10);
      DisableGrf(STR_NEWGRF_ERROR_INVALID_SPRITE_LAYOUT);
      return;
    }
  }
 
  if (flags & TLF_PALETTE_VAR10) {
    regs.palette_var10 = buf->ReadByte();
    if (regs.palette_var10 > TLR_MAX_VAR10) {
      grfmsg(1, "ReadSpriteLayoutRegisters: Spritelayout specifies var10 (%d) exceeding the maximal allowed value %d", regs.palette_var10, TLR_MAX_VAR10);
      DisableGrf(STR_NEWGRF_ERROR_INVALID_SPRITE_LAYOUT);
      return;
    }
  }
}
 
static bool ReadSpriteLayout(ByteReader *buf, uint num_building_sprites, bool use_cur_spritesets, byte feature, bool allow_var10, bool no_z_position, NewGRFSpriteLayout *dts)
{
  bool has_flags = HasBit(num_building_sprites, 6);
  ClrBit(num_building_sprites, 6);
  TileLayoutFlags valid_flags = TLF_KNOWN_FLAGS;
  if (!allow_var10) valid_flags &= ~TLF_VAR10_FLAGS;
  dts->Allocate(num_building_sprites); // allocate before reading groundsprite flags
 
  uint16 *max_sprite_offset = AllocaM(uint16, num_building_sprites + 1);
  uint16 *max_palette_offset = AllocaM(uint16, num_building_sprites + 1);
  MemSetT(max_sprite_offset, 0, num_building_sprites + 1);
  MemSetT(max_palette_offset, 0, num_building_sprites + 1);
 
  /* Groundsprite */
  TileLayoutFlags flags = ReadSpriteLayoutSprite(buf, has_flags, false, use_cur_spritesets, feature, &dts->ground, max_sprite_offset, max_palette_offset);
  if (_cur.skip_sprites < 0) return true;
 
  if (flags & ~(valid_flags & ~TLF_NON_GROUND_FLAGS)) {
    grfmsg(1, "ReadSpriteLayout: Spritelayout uses invalid flag 0x%x for ground sprite", flags & ~(valid_flags & ~TLF_NON_GROUND_FLAGS));
    DisableGrf(STR_NEWGRF_ERROR_INVALID_SPRITE_LAYOUT);
    return true;
  }
 
  ReadSpriteLayoutRegisters(buf, flags, false, dts, 0);
  if (_cur.skip_sprites < 0) return true;
 
  for (uint i = 0; i < num_building_sprites; i++) {
    DrawTileSeqStruct *seq = const_cast<DrawTileSeqStruct*>(&dts->seq[i]);
 
    flags = ReadSpriteLayoutSprite(buf, has_flags, false, use_cur_spritesets, feature, &seq->image, max_sprite_offset + i + 1, max_palette_offset + i + 1);
    if (_cur.skip_sprites < 0) return true;
 
    if (flags & ~valid_flags) {
      grfmsg(1, "ReadSpriteLayout: Spritelayout uses unknown flag 0x%x", flags & ~valid_flags);
      DisableGrf(STR_NEWGRF_ERROR_INVALID_SPRITE_LAYOUT);
      return true;
    }
 
    seq->delta_x = buf->ReadByte();
    seq->delta_y = buf->ReadByte();
 
    if (!no_z_position) seq->delta_z = buf->ReadByte();
 
    if (seq->IsParentSprite()) {
      seq->size_x = buf->ReadByte();
      seq->size_y = buf->ReadByte();
      seq->size_z = buf->ReadByte();
    }
 
    ReadSpriteLayoutRegisters(buf, flags, seq->IsParentSprite(), dts, i + 1);
    if (_cur.skip_sprites < 0) return true;
  }
 
  /* Check if the number of sprites per spriteset is consistent */
  bool is_consistent = true;
  dts->consistent_max_offset = 0;
  for (uint i = 0; i < num_building_sprites + 1; i++) {
    if (max_sprite_offset[i] > 0) {
      if (dts->consistent_max_offset == 0) {
        dts->consistent_max_offset = max_sprite_offset[i];
      } else if (dts->consistent_max_offset != max_sprite_offset[i]) {
        is_consistent = false;
        break;
      }
    }
    if (max_palette_offset[i] > 0) {
      if (dts->consistent_max_offset == 0) {
        dts->consistent_max_offset = max_palette_offset[i];
      } else if (dts->consistent_max_offset != max_palette_offset[i]) {
        is_consistent = false;
        break;
      }
    }
  }
 
  /* When the Action1 sets are unknown, everything should be 0 (no spriteset usage) or UINT16_MAX (some spriteset usage) */
  assert(use_cur_spritesets || (is_consistent && (dts->consistent_max_offset == 0 || dts->consistent_max_offset == UINT16_MAX)));
 
  if (!is_consistent || dts->registers != nullptr) {
    dts->consistent_max_offset = 0;
    if (dts->registers == nullptr) dts->AllocateRegisters();
 
    for (uint i = 0; i < num_building_sprites + 1; i++) {
      TileLayoutRegisters &regs = const_cast<TileLayoutRegisters&>(dts->registers[i]);
      regs.max_sprite_offset = max_sprite_offset[i];
      regs.max_palette_offset = max_palette_offset[i];
    }
  }
 
  return false;
}
 
static CargoTypes TranslateRefitMask(uint32 refit_mask)
{
  CargoTypes result = 0;
  for (uint8 bit : SetBitIterator(refit_mask)) {
    CargoID cargo = GetCargoTranslation(bit, _cur.grffile, true);
    if (cargo != CT_INVALID) SetBit(result, cargo);
  }
  return result;
}
 
static void ConvertTTDBasePrice(uint32 base_pointer, const char *error_location, Price *index)
{
  /* Special value for 'none' */
  if (base_pointer == 0) {
    *index = INVALID_PRICE;
    return;
  }
 
  static const uint32 start = 0x4B34; 
  static const uint32 size  = 6;      
 
  if (base_pointer < start || (base_pointer - start) % size != 0 || (base_pointer - start) / size >= PR_END) {
    grfmsg(1, "%s: Unsupported running cost base 0x%04X, ignoring", error_location, base_pointer);
    return;
  }
 
  *index = (Price)((base_pointer - start) / size);
}
 
enum ChangeInfoResult {
  CIR_SUCCESS,    
  CIR_DISABLED,   
  CIR_UNHANDLED,  
  CIR_UNKNOWN,    
  CIR_INVALID_ID, 
};
 
typedef ChangeInfoResult (*VCI_Handler)(uint engine, int numinfo, int prop, ByteReader *buf);
 
static ChangeInfoResult CommonVehicleChangeInfo(EngineInfo *ei, int prop, ByteReader *buf)
{
  switch (prop) {
    case 0x00: // Introduction date
      ei->base_intro = buf->ReadWord() + DAYS_TILL_ORIGINAL_BASE_YEAR;
      break;
 
    case 0x02: // Decay speed
      ei->decay_speed = buf->ReadByte();
      break;
 
    case 0x03: // Vehicle life
      ei->lifelength = buf->ReadByte();
      break;
 
    case 0x04: // Model life
      ei->base_life = buf->ReadByte();
      break;
 
    case 0x06: // Climates available
      ei->climates = buf->ReadByte();
      break;
 
    case PROP_VEHICLE_LOAD_AMOUNT: // 0x07 Loading speed
      /* Amount of cargo loaded during a vehicle's "loading tick" */
      ei->load_amount = buf->ReadByte();
      break;
 
    default:
      return CIR_UNKNOWN;
  }
 
  return CIR_SUCCESS;
}
 
static ChangeInfoResult RailVehicleChangeInfo(uint engine, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  for (int i = 0; i < numinfo; i++) {
    Engine *e = GetNewEngine(_cur.grffile, VEH_TRAIN, engine + i);
    if (e == nullptr) return CIR_INVALID_ID; // No engine could be allocated, so neither can any next vehicles
 
    EngineInfo *ei = &e->info;
    RailVehicleInfo *rvi = &e->u.rail;
 
    switch (prop) {
      case 0x05: { // Track type
        uint8 tracktype = buf->ReadByte();
 
        if (tracktype < _cur.grffile->railtype_list.size()) {
          _gted[e->index].railtypelabel = _cur.grffile->railtype_list[tracktype];
          break;
        }
 
        switch (tracktype) {
          case 0: _gted[e->index].railtypelabel = rvi->engclass >= 2 ? RAILTYPE_ELECTRIC_LABEL : RAILTYPE_RAIL_LABEL; break;
          case 1: _gted[e->index].railtypelabel = RAILTYPE_MONO_LABEL; break;
          case 2: _gted[e->index].railtypelabel = RAILTYPE_MAGLEV_LABEL; break;
          default:
            grfmsg(1, "RailVehicleChangeInfo: Invalid track type %d specified, ignoring", tracktype);
            break;
        }
        break;
      }
 
      case 0x08: // AI passenger service
        /* Tells the AI that this engine is designed for
         * passenger services and shouldn't be used for freight. */
        rvi->ai_passenger_only = buf->ReadByte();
        break;
 
      case PROP_TRAIN_SPEED: { // 0x09 Speed (1 unit is 1 km-ish/h)
        uint16 speed = buf->ReadWord();
        if (speed == 0xFFFF) speed = 0;
 
        rvi->max_speed = speed;
        break;
      }
 
      case PROP_TRAIN_POWER: // 0x0B Power
        rvi->power = buf->ReadWord();
 
        /* Set engine / wagon state based on power */
        if (rvi->power != 0) {
          if (rvi->railveh_type == RAILVEH_WAGON) {
            rvi->railveh_type = RAILVEH_SINGLEHEAD;
          }
        } else {
          rvi->railveh_type = RAILVEH_WAGON;
        }
        break;
 
      case PROP_TRAIN_RUNNING_COST_FACTOR: // 0x0D Running cost factor
        rvi->running_cost = buf->ReadByte();
        break;
 
      case 0x0E: // Running cost base
        ConvertTTDBasePrice(buf->ReadDWord(), "RailVehicleChangeInfo", &rvi->running_cost_class);
        break;
 
      case 0x12: { // Sprite ID
        uint8 spriteid = buf->ReadByte();
        uint8 orig_spriteid = spriteid;
 
        /* TTD sprite IDs point to a location in a 16bit array, but we use it
         * as an array index, so we need it to be half the original value. */
        if (spriteid < 0xFD) spriteid >>= 1;
 
        if (IsValidNewGRFImageIndex<VEH_TRAIN>(spriteid)) {
          rvi->image_index = spriteid;
        } else {
          grfmsg(1, "RailVehicleChangeInfo: Invalid Sprite %d specified, ignoring", orig_spriteid);
          rvi->image_index = 0;
        }
        break;
      }
 
      case 0x13: { // Dual-headed
        uint8 dual = buf->ReadByte();
 
        if (dual != 0) {
          rvi->railveh_type = RAILVEH_MULTIHEAD;
        } else {
          rvi->railveh_type = rvi->power == 0 ?
            RAILVEH_WAGON : RAILVEH_SINGLEHEAD;
        }
        break;
      }
 
      case PROP_TRAIN_CARGO_CAPACITY: // 0x14 Cargo capacity
        rvi->capacity = buf->ReadByte();
        break;
 
      case 0x15: { // Cargo type
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        uint8 ctype = buf->ReadByte();
 
        if (ctype == 0xFF) {
          /* 0xFF is specified as 'use first refittable' */
          ei->cargo_type = CT_INVALID;
        } else if (_cur.grffile->grf_version >= 8) {
          /* Use translated cargo. Might result in CT_INVALID (first refittable), if cargo is not defined. */
          ei->cargo_type = GetCargoTranslation(ctype, _cur.grffile);
        } else if (ctype < NUM_CARGO) {
          /* Use untranslated cargo. */
          ei->cargo_type = ctype;
        } else {
          ei->cargo_type = CT_INVALID;
          grfmsg(2, "RailVehicleChangeInfo: Invalid cargo type %d, using first refittable", ctype);
        }
        break;
      }
 
      case PROP_TRAIN_WEIGHT: // 0x16 Weight
        SB(rvi->weight, 0, 8, buf->ReadByte());
        break;
 
      case PROP_TRAIN_COST_FACTOR: // 0x17 Cost factor
        rvi->cost_factor = buf->ReadByte();
        break;
 
      case 0x18: // AI rank
        grfmsg(2, "RailVehicleChangeInfo: Property 0x18 'AI rank' not used by NoAI, ignored.");
        buf->ReadByte();
        break;
 
      case 0x19: { // Engine traction type
        /* What do the individual numbers mean?
         * 0x00 .. 0x07: Steam
         * 0x08 .. 0x27: Diesel
         * 0x28 .. 0x31: Electric
         * 0x32 .. 0x37: Monorail
         * 0x38 .. 0x41: Maglev
         */
        uint8 traction = buf->ReadByte();
        EngineClass engclass;
 
        if (traction <= 0x07) {
          engclass = EC_STEAM;
        } else if (traction <= 0x27) {
          engclass = EC_DIESEL;
        } else if (traction <= 0x31) {
          engclass = EC_ELECTRIC;
        } else if (traction <= 0x37) {
          engclass = EC_MONORAIL;
        } else if (traction <= 0x41) {
          engclass = EC_MAGLEV;
        } else {
          break;
        }
 
        if (_cur.grffile->railtype_list.size() == 0) {
          /* Use traction type to select between normal and electrified
           * rail only when no translation list is in place. */
          if (_gted[e->index].railtypelabel == RAILTYPE_RAIL_LABEL     && engclass >= EC_ELECTRIC) _gted[e->index].railtypelabel = RAILTYPE_ELECTRIC_LABEL;
          if (_gted[e->index].railtypelabel == RAILTYPE_ELECTRIC_LABEL && engclass  < EC_ELECTRIC) _gted[e->index].railtypelabel = RAILTYPE_RAIL_LABEL;
        }
 
        rvi->engclass = engclass;
        break;
      }
 
      case 0x1A: // Alter purchase list sort order
        AlterVehicleListOrder(e->index, buf->ReadExtendedByte());
        break;
 
      case 0x1B: // Powered wagons power bonus
        rvi->pow_wag_power = buf->ReadWord();
        break;
 
      case 0x1C: // Refit cost
        ei->refit_cost = buf->ReadByte();
        break;
 
      case 0x1D: { // Refit cargo
        uint32 mask = buf->ReadDWord();
        _gted[e->index].UpdateRefittability(mask != 0);
        ei->refit_mask = TranslateRefitMask(mask);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
      }
 
      case 0x1E: // Callback
        ei->callback_mask = buf->ReadByte();
        break;
 
      case PROP_TRAIN_TRACTIVE_EFFORT: // 0x1F Tractive effort coefficient
        rvi->tractive_effort = buf->ReadByte();
        break;
 
      case 0x20: // Air drag
        rvi->air_drag = buf->ReadByte();
        break;
 
      case PROP_TRAIN_SHORTEN_FACTOR: // 0x21 Shorter vehicle
        rvi->shorten_factor = buf->ReadByte();
        break;
 
      case 0x22: // Visual effect
        rvi->visual_effect = buf->ReadByte();
        /* Avoid accidentally setting visual_effect to the default value
         * Since bit 6 (disable effects) is set anyways, we can safely erase some bits. */
        if (rvi->visual_effect == VE_DEFAULT) {
          assert(HasBit(rvi->visual_effect, VE_DISABLE_EFFECT));
          SB(rvi->visual_effect, VE_TYPE_START, VE_TYPE_COUNT, 0);
        }
        break;
 
      case 0x23: // Powered wagons weight bonus
        rvi->pow_wag_weight = buf->ReadByte();
        break;
 
      case 0x24: { // High byte of vehicle weight
        byte weight = buf->ReadByte();
 
        if (weight > 4) {
          grfmsg(2, "RailVehicleChangeInfo: Nonsensical weight of %d tons, ignoring", weight << 8);
        } else {
          SB(rvi->weight, 8, 8, weight);
        }
        break;
      }
 
      case PROP_TRAIN_USER_DATA: // 0x25 User-defined bit mask to set when checking veh. var. 42
        rvi->user_def_data = buf->ReadByte();
        break;
 
      case 0x26: // Retire vehicle early
        ei->retire_early = buf->ReadByte();
        break;
 
      case 0x27: // Miscellaneous flags
        ei->misc_flags = buf->ReadByte();
        _loaded_newgrf_features.has_2CC |= HasBit(ei->misc_flags, EF_USES_2CC);
        break;
 
      case 0x28: // Cargo classes allowed
        _gted[e->index].cargo_allowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(_gted[e->index].cargo_allowed != 0);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
 
      case 0x29: // Cargo classes disallowed
        _gted[e->index].cargo_disallowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(false);
        break;
 
      case 0x2A: // Long format introduction date (days since year 0)
        ei->base_intro = buf->ReadDWord();
        break;
 
      case PROP_TRAIN_CARGO_AGE_PERIOD: // 0x2B Cargo aging period
        ei->cargo_age_period = buf->ReadWord();
        break;
 
      case 0x2C:   // CTT refit include list
      case 0x2D: { // CTT refit exclude list
        uint8 count = buf->ReadByte();
        _gted[e->index].UpdateRefittability(prop == 0x2C && count != 0);
        if (prop == 0x2C) _gted[e->index].defaultcargo_grf = _cur.grffile;
        CargoTypes &ctt = prop == 0x2C ? _gted[e->index].ctt_include_mask : _gted[e->index].ctt_exclude_mask;
        ctt = 0;
        while (count--) {
          CargoID ctype = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
          if (ctype == CT_INVALID) continue;
          SetBit(ctt, ctype);
        }
        break;
      }
 
      case PROP_TRAIN_CURVE_SPEED_MOD: // 0x2E Curve speed modifier
        rvi->curve_speed_mod = buf->ReadWord();
        break;
 
      case 0x2F: // Engine variant
        ei->variant_id = buf->ReadWord();
        break;
 
      case 0x30: // Extra miscellaneous flags
        ei->extra_flags = static_cast<ExtraEngineFlags>(buf->ReadDWord());
        break;
 
      default:
        ret = CommonVehicleChangeInfo(ei, prop, buf);
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult RoadVehicleChangeInfo(uint engine, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  for (int i = 0; i < numinfo; i++) {
    Engine *e = GetNewEngine(_cur.grffile, VEH_ROAD, engine + i);
    if (e == nullptr) return CIR_INVALID_ID; // No engine could be allocated, so neither can any next vehicles
 
    EngineInfo *ei = &e->info;
    RoadVehicleInfo *rvi = &e->u.road;
 
    switch (prop) {
      case 0x05: // Road/tram type
        /* RoadTypeLabel is looked up later after the engine's road/tram
         * flag is set, however 0 means the value has not been set. */
        _gted[e->index].roadtramtype = buf->ReadByte() + 1;
        break;
 
      case 0x08: // Speed (1 unit is 0.5 kmh)
        rvi->max_speed = buf->ReadByte();
        break;
 
      case PROP_ROADVEH_RUNNING_COST_FACTOR: // 0x09 Running cost factor
        rvi->running_cost = buf->ReadByte();
        break;
 
      case 0x0A: // Running cost base
        ConvertTTDBasePrice(buf->ReadDWord(), "RoadVehicleChangeInfo", &rvi->running_cost_class);
        break;
 
      case 0x0E: { // Sprite ID
        uint8 spriteid = buf->ReadByte();
        uint8 orig_spriteid = spriteid;
 
        /* cars have different custom id in the GRF file */
        if (spriteid == 0xFF) spriteid = 0xFD;
 
        if (spriteid < 0xFD) spriteid >>= 1;
 
        if (IsValidNewGRFImageIndex<VEH_ROAD>(spriteid)) {
          rvi->image_index = spriteid;
        } else {
          grfmsg(1, "RoadVehicleChangeInfo: Invalid Sprite %d specified, ignoring", orig_spriteid);
          rvi->image_index = 0;
        }
        break;
      }
 
      case PROP_ROADVEH_CARGO_CAPACITY: // 0x0F Cargo capacity
        rvi->capacity = buf->ReadByte();
        break;
 
      case 0x10: { // Cargo type
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        uint8 ctype = buf->ReadByte();
 
        if (ctype == 0xFF) {
          /* 0xFF is specified as 'use first refittable' */
          ei->cargo_type = CT_INVALID;
        } else if (_cur.grffile->grf_version >= 8) {
          /* Use translated cargo. Might result in CT_INVALID (first refittable), if cargo is not defined. */
          ei->cargo_type = GetCargoTranslation(ctype, _cur.grffile);
        } else if (ctype < NUM_CARGO) {
          /* Use untranslated cargo. */
          ei->cargo_type = ctype;
        } else {
          ei->cargo_type = CT_INVALID;
          grfmsg(2, "RailVehicleChangeInfo: Invalid cargo type %d, using first refittable", ctype);
        }
        break;
      }
 
      case PROP_ROADVEH_COST_FACTOR: // 0x11 Cost factor
        rvi->cost_factor = buf->ReadByte();
        break;
 
      case 0x12: // SFX
        rvi->sfx = GetNewGRFSoundID(_cur.grffile, buf->ReadByte());
        break;
 
      case PROP_ROADVEH_POWER: // Power in units of 10 HP.
        rvi->power = buf->ReadByte();
        break;
 
      case PROP_ROADVEH_WEIGHT: // Weight in units of 1/4 tons.
        rvi->weight = buf->ReadByte();
        break;
 
      case PROP_ROADVEH_SPEED: // Speed in mph/0.8
        _gted[e->index].rv_max_speed = buf->ReadByte();
        break;
 
      case 0x16: { // Cargoes available for refitting
        uint32 mask = buf->ReadDWord();
        _gted[e->index].UpdateRefittability(mask != 0);
        ei->refit_mask = TranslateRefitMask(mask);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
      }
 
      case 0x17: // Callback mask
        ei->callback_mask = buf->ReadByte();
        break;
 
      case PROP_ROADVEH_TRACTIVE_EFFORT: // Tractive effort coefficient in 1/256.
        rvi->tractive_effort = buf->ReadByte();
        break;
 
      case 0x19: // Air drag
        rvi->air_drag = buf->ReadByte();
        break;
 
      case 0x1A: // Refit cost
        ei->refit_cost = buf->ReadByte();
        break;
 
      case 0x1B: // Retire vehicle early
        ei->retire_early = buf->ReadByte();
        break;
 
      case 0x1C: // Miscellaneous flags
        ei->misc_flags = buf->ReadByte();
        _loaded_newgrf_features.has_2CC |= HasBit(ei->misc_flags, EF_USES_2CC);
        break;
 
      case 0x1D: // Cargo classes allowed
        _gted[e->index].cargo_allowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(_gted[e->index].cargo_allowed != 0);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
 
      case 0x1E: // Cargo classes disallowed
        _gted[e->index].cargo_disallowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(false);
        break;
 
      case 0x1F: // Long format introduction date (days since year 0)
        ei->base_intro = buf->ReadDWord();
        break;
 
      case 0x20: // Alter purchase list sort order
        AlterVehicleListOrder(e->index, buf->ReadExtendedByte());
        break;
 
      case 0x21: // Visual effect
        rvi->visual_effect = buf->ReadByte();
        /* Avoid accidentally setting visual_effect to the default value
         * Since bit 6 (disable effects) is set anyways, we can safely erase some bits. */
        if (rvi->visual_effect == VE_DEFAULT) {
          assert(HasBit(rvi->visual_effect, VE_DISABLE_EFFECT));
          SB(rvi->visual_effect, VE_TYPE_START, VE_TYPE_COUNT, 0);
        }
        break;
 
      case PROP_ROADVEH_CARGO_AGE_PERIOD: // 0x22 Cargo aging period
        ei->cargo_age_period = buf->ReadWord();
        break;
 
      case PROP_ROADVEH_SHORTEN_FACTOR: // 0x23 Shorter vehicle
        rvi->shorten_factor = buf->ReadByte();
        break;
 
      case 0x24:   // CTT refit include list
      case 0x25: { // CTT refit exclude list
        uint8 count = buf->ReadByte();
        _gted[e->index].UpdateRefittability(prop == 0x24 && count != 0);
        if (prop == 0x24) _gted[e->index].defaultcargo_grf = _cur.grffile;
        CargoTypes &ctt = prop == 0x24 ? _gted[e->index].ctt_include_mask : _gted[e->index].ctt_exclude_mask;
        ctt = 0;
        while (count--) {
          CargoID ctype = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
          if (ctype == CT_INVALID) continue;
          SetBit(ctt, ctype);
        }
        break;
      }
 
      case 0x26: // Engine variant
        ei->variant_id = buf->ReadWord();
        break;
 
      case 0x27: // Extra miscellaneous flags
        ei->extra_flags = static_cast<ExtraEngineFlags>(buf->ReadDWord());
        break;
 
      default:
        ret = CommonVehicleChangeInfo(ei, prop, buf);
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult ShipVehicleChangeInfo(uint engine, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  for (int i = 0; i < numinfo; i++) {
    Engine *e = GetNewEngine(_cur.grffile, VEH_SHIP, engine + i);
    if (e == nullptr) return CIR_INVALID_ID; // No engine could be allocated, so neither can any next vehicles
 
    EngineInfo *ei = &e->info;
    ShipVehicleInfo *svi = &e->u.ship;
 
    switch (prop) {
      case 0x08: { // Sprite ID
        uint8 spriteid = buf->ReadByte();
        uint8 orig_spriteid = spriteid;
 
        /* ships have different custom id in the GRF file */
        if (spriteid == 0xFF) spriteid = 0xFD;
 
        if (spriteid < 0xFD) spriteid >>= 1;
 
        if (IsValidNewGRFImageIndex<VEH_SHIP>(spriteid)) {
          svi->image_index = spriteid;
        } else {
          grfmsg(1, "ShipVehicleChangeInfo: Invalid Sprite %d specified, ignoring", orig_spriteid);
          svi->image_index = 0;
        }
        break;
      }
 
      case 0x09: // Refittable
        svi->old_refittable = (buf->ReadByte() != 0);
        break;
 
      case PROP_SHIP_COST_FACTOR: // 0x0A Cost factor
        svi->cost_factor = buf->ReadByte();
        break;
 
      case PROP_SHIP_SPEED: // 0x0B Speed (1 unit is 0.5 km-ish/h)
        svi->max_speed = buf->ReadByte();
        break;
 
      case 0x0C: { // Cargo type
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        uint8 ctype = buf->ReadByte();
 
        if (ctype == 0xFF) {
          /* 0xFF is specified as 'use first refittable' */
          ei->cargo_type = CT_INVALID;
        } else if (_cur.grffile->grf_version >= 8) {
          /* Use translated cargo. Might result in CT_INVALID (first refittable), if cargo is not defined. */
          ei->cargo_type = GetCargoTranslation(ctype, _cur.grffile);
        } else if (ctype < NUM_CARGO) {
          /* Use untranslated cargo. */
          ei->cargo_type = ctype;
        } else {
          ei->cargo_type = CT_INVALID;
          grfmsg(2, "RailVehicleChangeInfo: Invalid cargo type %d, using first refittable", ctype);
        }
        break;
      }
 
      case PROP_SHIP_CARGO_CAPACITY: // 0x0D Cargo capacity
        svi->capacity = buf->ReadWord();
        break;
 
      case PROP_SHIP_RUNNING_COST_FACTOR: // 0x0F Running cost factor
        svi->running_cost = buf->ReadByte();
        break;
 
      case 0x10: // SFX
        svi->sfx = GetNewGRFSoundID(_cur.grffile, buf->ReadByte());
        break;
 
      case 0x11: { // Cargoes available for refitting
        uint32 mask = buf->ReadDWord();
        _gted[e->index].UpdateRefittability(mask != 0);
        ei->refit_mask = TranslateRefitMask(mask);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
      }
 
      case 0x12: // Callback mask
        ei->callback_mask = buf->ReadByte();
        break;
 
      case 0x13: // Refit cost
        ei->refit_cost = buf->ReadByte();
        break;
 
      case 0x14: // Ocean speed fraction
        svi->ocean_speed_frac = buf->ReadByte();
        break;
 
      case 0x15: // Canal speed fraction
        svi->canal_speed_frac = buf->ReadByte();
        break;
 
      case 0x16: // Retire vehicle early
        ei->retire_early = buf->ReadByte();
        break;
 
      case 0x17: // Miscellaneous flags
        ei->misc_flags = buf->ReadByte();
        _loaded_newgrf_features.has_2CC |= HasBit(ei->misc_flags, EF_USES_2CC);
        break;
 
      case 0x18: // Cargo classes allowed
        _gted[e->index].cargo_allowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(_gted[e->index].cargo_allowed != 0);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
 
      case 0x19: // Cargo classes disallowed
        _gted[e->index].cargo_disallowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(false);
        break;
 
      case 0x1A: // Long format introduction date (days since year 0)
        ei->base_intro = buf->ReadDWord();
        break;
 
      case 0x1B: // Alter purchase list sort order
        AlterVehicleListOrder(e->index, buf->ReadExtendedByte());
        break;
 
      case 0x1C: // Visual effect
        svi->visual_effect = buf->ReadByte();
        /* Avoid accidentally setting visual_effect to the default value
         * Since bit 6 (disable effects) is set anyways, we can safely erase some bits. */
        if (svi->visual_effect == VE_DEFAULT) {
          assert(HasBit(svi->visual_effect, VE_DISABLE_EFFECT));
          SB(svi->visual_effect, VE_TYPE_START, VE_TYPE_COUNT, 0);
        }
        break;
 
      case PROP_SHIP_CARGO_AGE_PERIOD: // 0x1D Cargo aging period
        ei->cargo_age_period = buf->ReadWord();
        break;
 
      case 0x1E:   // CTT refit include list
      case 0x1F: { // CTT refit exclude list
        uint8 count = buf->ReadByte();
        _gted[e->index].UpdateRefittability(prop == 0x1E && count != 0);
        if (prop == 0x1E) _gted[e->index].defaultcargo_grf = _cur.grffile;
        CargoTypes &ctt = prop == 0x1E ? _gted[e->index].ctt_include_mask : _gted[e->index].ctt_exclude_mask;
        ctt = 0;
        while (count--) {
          CargoID ctype = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
          if (ctype == CT_INVALID) continue;
          SetBit(ctt, ctype);
        }
        break;
      }
 
      case 0x20: // Engine variant
        ei->variant_id = buf->ReadWord();
        break;
 
      case 0x21: // Extra miscellaneous flags
        ei->extra_flags = static_cast<ExtraEngineFlags>(buf->ReadDWord());
        break;
 
      default:
        ret = CommonVehicleChangeInfo(ei, prop, buf);
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult AircraftVehicleChangeInfo(uint engine, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  for (int i = 0; i < numinfo; i++) {
    Engine *e = GetNewEngine(_cur.grffile, VEH_AIRCRAFT, engine + i);
    if (e == nullptr) return CIR_INVALID_ID; // No engine could be allocated, so neither can any next vehicles
 
    EngineInfo *ei = &e->info;
    AircraftVehicleInfo *avi = &e->u.air;
 
    switch (prop) {
      case 0x08: { // Sprite ID
        uint8 spriteid = buf->ReadByte();
        uint8 orig_spriteid = spriteid;
 
        /* aircraft have different custom id in the GRF file */
        if (spriteid == 0xFF) spriteid = 0xFD;
 
        if (spriteid < 0xFD) spriteid >>= 1;
 
        if (IsValidNewGRFImageIndex<VEH_AIRCRAFT>(spriteid)) {
          avi->image_index = spriteid;
        } else {
          grfmsg(1, "AircraftVehicleChangeInfo: Invalid Sprite %d specified, ignoring", orig_spriteid);
          avi->image_index = 0;
        }
        break;
      }
 
      case 0x09: // Helicopter
        if (buf->ReadByte() == 0) {
          avi->subtype = AIR_HELI;
        } else {
          SB(avi->subtype, 0, 1, 1); // AIR_CTOL
        }
        break;
 
      case 0x0A: // Large
        SB(avi->subtype, 1, 1, (buf->ReadByte() != 0 ? 1 : 0)); // AIR_FAST
        break;
 
      case PROP_AIRCRAFT_COST_FACTOR: // 0x0B Cost factor
        avi->cost_factor = buf->ReadByte();
        break;
 
      case PROP_AIRCRAFT_SPEED: // 0x0C Speed (1 unit is 8 mph, we translate to 1 unit is 1 km-ish/h)
        avi->max_speed = (buf->ReadByte() * 128) / 10;
        break;
 
      case 0x0D: // Acceleration
        avi->acceleration = buf->ReadByte();
        break;
 
      case PROP_AIRCRAFT_RUNNING_COST_FACTOR: // 0x0E Running cost factor
        avi->running_cost = buf->ReadByte();
        break;
 
      case PROP_AIRCRAFT_PASSENGER_CAPACITY: // 0x0F Passenger capacity
        avi->passenger_capacity = buf->ReadWord();
        break;
 
      case PROP_AIRCRAFT_MAIL_CAPACITY: // 0x11 Mail capacity
        avi->mail_capacity = buf->ReadByte();
        break;
 
      case 0x12: // SFX
        avi->sfx = GetNewGRFSoundID(_cur.grffile, buf->ReadByte());
        break;
 
      case 0x13: { // Cargoes available for refitting
        uint32 mask = buf->ReadDWord();
        _gted[e->index].UpdateRefittability(mask != 0);
        ei->refit_mask = TranslateRefitMask(mask);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
      }
 
      case 0x14: // Callback mask
        ei->callback_mask = buf->ReadByte();
        break;
 
      case 0x15: // Refit cost
        ei->refit_cost = buf->ReadByte();
        break;
 
      case 0x16: // Retire vehicle early
        ei->retire_early = buf->ReadByte();
        break;
 
      case 0x17: // Miscellaneous flags
        ei->misc_flags = buf->ReadByte();
        _loaded_newgrf_features.has_2CC |= HasBit(ei->misc_flags, EF_USES_2CC);
        break;
 
      case 0x18: // Cargo classes allowed
        _gted[e->index].cargo_allowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(_gted[e->index].cargo_allowed != 0);
        _gted[e->index].defaultcargo_grf = _cur.grffile;
        break;
 
      case 0x19: // Cargo classes disallowed
        _gted[e->index].cargo_disallowed = buf->ReadWord();
        _gted[e->index].UpdateRefittability(false);
        break;
 
      case 0x1A: // Long format introduction date (days since year 0)
        ei->base_intro = buf->ReadDWord();
        break;
 
      case 0x1B: // Alter purchase list sort order
        AlterVehicleListOrder(e->index, buf->ReadExtendedByte());
        break;
 
      case PROP_AIRCRAFT_CARGO_AGE_PERIOD: // 0x1C Cargo aging period
        ei->cargo_age_period = buf->ReadWord();
        break;
 
      case 0x1D:   // CTT refit include list
      case 0x1E: { // CTT refit exclude list
        uint8 count = buf->ReadByte();
        _gted[e->index].UpdateRefittability(prop == 0x1D && count != 0);
        if (prop == 0x1D) _gted[e->index].defaultcargo_grf = _cur.grffile;
        CargoTypes &ctt = prop == 0x1D ? _gted[e->index].ctt_include_mask : _gted[e->index].ctt_exclude_mask;
        ctt = 0;
        while (count--) {
          CargoID ctype = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
          if (ctype == CT_INVALID) continue;
          SetBit(ctt, ctype);
        }
        break;
      }
 
      case PROP_AIRCRAFT_RANGE: // 0x1F Max aircraft range
        avi->max_range = buf->ReadWord();
        break;
 
      case 0x20: // Engine variant
        ei->variant_id = buf->ReadWord();
        break;
 
      case 0x21: // Extra miscellaneous flags
        ei->extra_flags = static_cast<ExtraEngineFlags>(buf->ReadDWord());
        break;
 
      default:
        ret = CommonVehicleChangeInfo(ei, prop, buf);
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult StationChangeInfo(uint stid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (stid + numinfo > NUM_STATIONS_PER_GRF) {
    grfmsg(1, "StationChangeInfo: Station %u is invalid, max %u, ignoring", stid + numinfo, NUM_STATIONS_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate station specs if necessary */
  if (_cur.grffile->stations == nullptr) _cur.grffile->stations = CallocT<StationSpec*>(NUM_STATIONS_PER_GRF);
 
  for (int i = 0; i < numinfo; i++) {
    StationSpec *statspec = _cur.grffile->stations[stid + i];
 
    /* Check that the station we are modifying is defined. */
    if (statspec == nullptr && prop != 0x08) {
      grfmsg(2, "StationChangeInfo: Attempt to modify undefined station %u, ignoring", stid + i);
      return CIR_INVALID_ID;
    }
 
    switch (prop) {
      case 0x08: { // Class ID
        StationSpec **spec = &_cur.grffile->stations[stid + i];
 
        /* Property 0x08 is special; it is where the station is allocated */
        if (*spec == nullptr) *spec = new StationSpec();
 
        /* Swap classid because we read it in BE meaning WAYP or DFLT */
        uint32 classid = buf->ReadDWord();
        (*spec)->cls_id = StationClass::Allocate(BSWAP32(classid));
        break;
      }
 
      case 0x09: { // Define sprite layout
        uint16 tiles = buf->ReadExtendedByte();
        statspec->renderdata.clear(); // delete earlier loaded stuff
        statspec->renderdata.reserve(tiles);
 
        for (uint t = 0; t < tiles; t++) {
          NewGRFSpriteLayout *dts = &statspec->renderdata.emplace_back();
          dts->consistent_max_offset = UINT16_MAX; // Spritesets are unknown, so no limit.
 
          if (buf->HasData(4) && *(uint32*)buf->Data() == 0) {
            buf->Skip(4);
            extern const DrawTileSprites _station_display_datas_rail[8];
            dts->Clone(&_station_display_datas_rail[t % 8]);
            continue;
          }
 
          ReadSpriteLayoutSprite(buf, false, false, false, GSF_STATIONS, &dts->ground);
          /* On error, bail out immediately. Temporary GRF data was already freed */
          if (_cur.skip_sprites < 0) return CIR_DISABLED;
 
          static std::vector<DrawTileSeqStruct> tmp_layout;
          tmp_layout.clear();
          for (;;) {
            /* no relative bounding box support */
            DrawTileSeqStruct &dtss = tmp_layout.emplace_back();
            MemSetT(&dtss, 0);
 
            dtss.delta_x = buf->ReadByte();
            if (dtss.IsTerminator()) break;
            dtss.delta_y = buf->ReadByte();
            dtss.delta_z = buf->ReadByte();
            dtss.size_x = buf->ReadByte();
            dtss.size_y = buf->ReadByte();
            dtss.size_z = buf->ReadByte();
 
            ReadSpriteLayoutSprite(buf, false, true, false, GSF_STATIONS, &dtss.image);
            /* On error, bail out immediately. Temporary GRF data was already freed */
            if (_cur.skip_sprites < 0) return CIR_DISABLED;
          }
          dts->Clone(tmp_layout.data());
        }
 
        /* Number of layouts must be even, alternating X and Y */
        if (statspec->renderdata.size() & 1) {
          grfmsg(1, "StationChangeInfo: Station %u defines an odd number of sprite layouts, dropping the last item", stid + i);
          statspec->renderdata.pop_back();
        }
        break;
      }
 
      case 0x0A: { // Copy sprite layout
        byte srcid = buf->ReadByte();
        const StationSpec *srcstatspec = _cur.grffile->stations[srcid];
 
        if (srcstatspec == nullptr) {
          grfmsg(1, "StationChangeInfo: Station %u is not defined, cannot copy sprite layout to %u.", srcid, stid + i);
          continue;
        }
 
        statspec->renderdata.clear(); // delete earlier loaded stuff
        statspec->renderdata.reserve(srcstatspec->renderdata.size());
 
        for (const auto &it : srcstatspec->renderdata) {
          NewGRFSpriteLayout *dts = &statspec->renderdata.emplace_back();
          dts->Clone(&it);
        }
        break;
      }
 
      case 0x0B: // Callback mask
        statspec->callback_mask = buf->ReadByte();
        break;
 
      case 0x0C: // Disallowed number of platforms
        statspec->disallowed_platforms = buf->ReadByte();
        break;
 
      case 0x0D: // Disallowed platform lengths
        statspec->disallowed_lengths = buf->ReadByte();
        break;
 
      case 0x0E: // Define custom layout
        while (buf->HasData()) {
          byte length = buf->ReadByte();
          byte number = buf->ReadByte();
 
          if (length == 0 || number == 0) break;
 
          if (statspec->layouts.size() < length) statspec->layouts.resize(length);
          if (statspec->layouts[length - 1].size() < number) statspec->layouts[length - 1].resize(number);
 
          const byte *layout = buf->ReadBytes(length * number);
          statspec->layouts[length - 1][number - 1].assign(layout, layout + length * number);
 
          /* Validate tile values are only the permitted 00, 02, 04 and 06. */
          for (auto &tile : statspec->layouts[length - 1][number - 1]) {
            if ((tile & 6) != tile) {
              grfmsg(1, "StationChangeInfo: Invalid tile %u in layout %ux%u", tile, length, number);
              tile &= 6;
            }
          }
        }
        break;
 
      case 0x0F: { // Copy custom layout
        byte srcid = buf->ReadByte();
        const StationSpec *srcstatspec = _cur.grffile->stations[srcid];
 
        if (srcstatspec == nullptr) {
          grfmsg(1, "StationChangeInfo: Station %u is not defined, cannot copy tile layout to %u.", srcid, stid + i);
          continue;
        }
 
        statspec->layouts = srcstatspec->layouts;
        break;
      }
 
      case 0x10: // Little/lots cargo threshold
        statspec->cargo_threshold = buf->ReadWord();
        break;
 
      case 0x11: // Pylon placement
        statspec->pylons = buf->ReadByte();
        break;
 
      case 0x12: // Cargo types for random triggers
        if (_cur.grffile->grf_version >= 7) {
          statspec->cargo_triggers = TranslateRefitMask(buf->ReadDWord());
        } else {
          statspec->cargo_triggers = (CargoTypes)buf->ReadDWord();
        }
        break;
 
      case 0x13: // General flags
        statspec->flags = buf->ReadByte();
        break;
 
      case 0x14: // Overhead wire placement
        statspec->wires = buf->ReadByte();
        break;
 
      case 0x15: // Blocked tiles
        statspec->blocked = buf->ReadByte();
        break;
 
      case 0x16: // Animation info
        statspec->animation.frames = buf->ReadByte();
        statspec->animation.status = buf->ReadByte();
        break;
 
      case 0x17: // Animation speed
        statspec->animation.speed = buf->ReadByte();
        break;
 
      case 0x18: // Animation triggers
        statspec->animation.triggers = buf->ReadWord();
        break;
 
      case 0x1A: { // Advanced sprite layout
        uint16 tiles = buf->ReadExtendedByte();
        statspec->renderdata.clear(); // delete earlier loaded stuff
        statspec->renderdata.reserve(tiles);
 
        for (uint t = 0; t < tiles; t++) {
          NewGRFSpriteLayout *dts = &statspec->renderdata.emplace_back();
          uint num_building_sprites = buf->ReadByte();
          /* On error, bail out immediately. Temporary GRF data was already freed */
          if (ReadSpriteLayout(buf, num_building_sprites, false, GSF_STATIONS, true, false, dts)) return CIR_DISABLED;
        }
 
        /* Number of layouts must be even, alternating X and Y */
        if (statspec->renderdata.size() & 1) {
          grfmsg(1, "StationChangeInfo: Station %u defines an odd number of sprite layouts, dropping the last item", stid + i);
          statspec->renderdata.pop_back();
        }
        break;
      }
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult CanalChangeInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (id + numinfo > CF_END) {
    grfmsg(1, "CanalChangeInfo: Canal feature 0x%02X is invalid, max %u, ignoring", id + numinfo, CF_END);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    CanalProperties *cp = &_cur.grffile->canal_local_properties[id + i];
 
    switch (prop) {
      case 0x08:
        cp->callback_mask = buf->ReadByte();
        break;
 
      case 0x09:
        cp->flags = buf->ReadByte();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult BridgeChangeInfo(uint brid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (brid + numinfo > MAX_BRIDGES) {
    grfmsg(1, "BridgeChangeInfo: Bridge %u is invalid, max %u, ignoring", brid + numinfo, MAX_BRIDGES);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    BridgeSpec *bridge = &_bridge[brid + i];
 
    switch (prop) {
      case 0x08: { // Year of availability
        /* We treat '0' as always available */
        byte year = buf->ReadByte();
        bridge->avail_year = (year > 0 ? ORIGINAL_BASE_YEAR + year : 0);
        break;
      }
 
      case 0x09: // Minimum length
        bridge->min_length = buf->ReadByte();
        break;
 
      case 0x0A: // Maximum length
        bridge->max_length = buf->ReadByte();
        if (bridge->max_length > 16) bridge->max_length = UINT16_MAX;
        break;
 
      case 0x0B: // Cost factor
        bridge->price = buf->ReadByte();
        break;
 
      case 0x0C: // Maximum speed
        bridge->speed = buf->ReadWord();
        if (bridge->speed == 0) bridge->speed = UINT16_MAX;
        break;
 
      case 0x0D: { // Bridge sprite tables
        byte tableid = buf->ReadByte();
        byte numtables = buf->ReadByte();
 
        if (bridge->sprite_table == nullptr) {
          /* Allocate memory for sprite table pointers and zero out */
          bridge->sprite_table = CallocT<PalSpriteID*>(7);
        }
 
        for (; numtables-- != 0; tableid++) {
          if (tableid >= 7) { // skip invalid data
            grfmsg(1, "BridgeChangeInfo: Table %d >= 7, skipping", tableid);
            for (byte sprite = 0; sprite < 32; sprite++) buf->ReadDWord();
            continue;
          }
 
          if (bridge->sprite_table[tableid] == nullptr) {
            bridge->sprite_table[tableid] = MallocT<PalSpriteID>(32);
          }
 
          for (byte sprite = 0; sprite < 32; sprite++) {
            SpriteID image = buf->ReadWord();
            PaletteID pal  = buf->ReadWord();
 
            bridge->sprite_table[tableid][sprite].sprite = image;
            bridge->sprite_table[tableid][sprite].pal    = pal;
 
            MapSpriteMappingRecolour(&bridge->sprite_table[tableid][sprite]);
          }
        }
        break;
      }
 
      case 0x0E: // Flags; bit 0 - disable far pillars
        bridge->flags = buf->ReadByte();
        break;
 
      case 0x0F: // Long format year of availability (year since year 0)
        bridge->avail_year = Clamp(buf->ReadDWord(), MIN_YEAR, MAX_YEAR);
        break;
 
      case 0x10: { // purchase string
        StringID newone = GetGRFStringID(_cur.grffile->grfid, buf->ReadWord());
        if (newone != STR_UNDEFINED) bridge->material = newone;
        break;
      }
 
      case 0x11: // description of bridge with rails or roads
      case 0x12: {
        StringID newone = GetGRFStringID(_cur.grffile->grfid, buf->ReadWord());
        if (newone != STR_UNDEFINED) bridge->transport_name[prop - 0x11] = newone;
        break;
      }
 
      case 0x13: // 16 bits cost multiplier
        bridge->price = buf->ReadWord();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult IgnoreTownHouseProperty(int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  switch (prop) {
    case 0x09:
    case 0x0B:
    case 0x0C:
    case 0x0D:
    case 0x0E:
    case 0x0F:
    case 0x11:
    case 0x14:
    case 0x15:
    case 0x16:
    case 0x18:
    case 0x19:
    case 0x1A:
    case 0x1B:
    case 0x1C:
    case 0x1D:
    case 0x1F:
      buf->ReadByte();
      break;
 
    case 0x0A:
    case 0x10:
    case 0x12:
    case 0x13:
    case 0x21:
    case 0x22:
      buf->ReadWord();
      break;
 
    case 0x1E:
      buf->ReadDWord();
      break;
 
    case 0x17:
      for (uint j = 0; j < 4; j++) buf->ReadByte();
      break;
 
    case 0x20: {
      byte count = buf->ReadByte();
      for (byte j = 0; j < count; j++) buf->ReadByte();
      break;
    }
 
    case 0x23:
      buf->Skip(buf->ReadByte() * 2);
      break;
 
    default:
      ret = CIR_UNKNOWN;
      break;
  }
  return ret;
}
 
static ChangeInfoResult TownHouseChangeInfo(uint hid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (hid + numinfo > NUM_HOUSES_PER_GRF) {
    grfmsg(1, "TownHouseChangeInfo: Too many houses loaded (%u), max (%u). Ignoring.", hid + numinfo, NUM_HOUSES_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate house specs if they haven't been allocated already. */
  if (_cur.grffile->housespec == nullptr) {
    _cur.grffile->housespec = CallocT<HouseSpec*>(NUM_HOUSES_PER_GRF);
  }
 
  for (int i = 0; i < numinfo; i++) {
    HouseSpec *housespec = _cur.grffile->housespec[hid + i];
 
    if (prop != 0x08 && housespec == nullptr) {
      /* If the house property 08 is not yet set, ignore this property */
      ChangeInfoResult cir = IgnoreTownHouseProperty(prop, buf);
      if (cir > ret) ret = cir;
      continue;
    }
 
    switch (prop) {
      case 0x08: { // Substitute building type, and definition of a new house
        HouseSpec **house = &_cur.grffile->housespec[hid + i];
        byte subs_id = buf->ReadByte();
 
        if (subs_id == 0xFF) {
          /* Instead of defining a new house, a substitute house id
           * of 0xFF disables the old house with the current id. */
          HouseSpec::Get(hid + i)->enabled = false;
          continue;
        } else if (subs_id >= NEW_HOUSE_OFFSET) {
          /* The substitute id must be one of the original houses. */
          grfmsg(2, "TownHouseChangeInfo: Attempt to use new house %u as substitute house for %u. Ignoring.", subs_id, hid + i);
          continue;
        }
 
        /* Allocate space for this house. */
        if (*house == nullptr) *house = CallocT<HouseSpec>(1);
 
        housespec = *house;
 
        MemCpyT(housespec, HouseSpec::Get(subs_id));
 
        housespec->enabled = true;
        housespec->grf_prop.local_id = hid + i;
        housespec->grf_prop.subst_id = subs_id;
        housespec->grf_prop.grffile = _cur.grffile;
        housespec->random_colour[0] = 0x04;  // those 4 random colours are the base colour
        housespec->random_colour[1] = 0x08;  // for all new houses
        housespec->random_colour[2] = 0x0C;  // they stand for red, blue, orange and green
        housespec->random_colour[3] = 0x06;
 
        /* Make sure that the third cargo type is valid in this
         * climate. This can cause problems when copying the properties
         * of a house that accepts food, where the new house is valid
         * in the temperate climate. */
        if (!CargoSpec::Get(housespec->accepts_cargo[2])->IsValid()) {
          housespec->cargo_acceptance[2] = 0;
        }
        break;
      }
 
      case 0x09: // Building flags
        housespec->building_flags = (BuildingFlags)buf->ReadByte();
        break;
 
      case 0x0A: { // Availability years
        uint16 years = buf->ReadWord();
        housespec->min_year = GB(years, 0, 8) > 150 ? MAX_YEAR : ORIGINAL_BASE_YEAR + GB(years, 0, 8);
        housespec->max_year = GB(years, 8, 8) > 150 ? MAX_YEAR : ORIGINAL_BASE_YEAR + GB(years, 8, 8);
        break;
      }
 
      case 0x0B: // Population
        housespec->population = buf->ReadByte();
        break;
 
      case 0x0C: // Mail generation multiplier
        housespec->mail_generation = buf->ReadByte();
        break;
 
      case 0x0D: // Passenger acceptance
      case 0x0E: // Mail acceptance
        housespec->cargo_acceptance[prop - 0x0D] = buf->ReadByte();
        break;
 
      case 0x0F: { // Goods/candy, food/fizzy drinks acceptance
        int8 goods = buf->ReadByte();
 
        /* If value of goods is negative, it means in fact food or, if in toyland, fizzy_drink acceptance.
         * Else, we have "standard" 3rd cargo type, goods or candy, for toyland once more */
        CargoID cid = (goods >= 0) ? ((_settings_game.game_creation.landscape == LT_TOYLAND) ? CT_CANDY : CT_GOODS) :
            ((_settings_game.game_creation.landscape == LT_TOYLAND) ? CT_FIZZY_DRINKS : CT_FOOD);
 
        /* Make sure the cargo type is valid in this climate. */
        if (!CargoSpec::Get(cid)->IsValid()) goods = 0;
 
        housespec->accepts_cargo[2] = cid;
        housespec->cargo_acceptance[2] = abs(goods); // but we do need positive value here
        break;
      }
 
      case 0x10: // Local authority rating decrease on removal
        housespec->remove_rating_decrease = buf->ReadWord();
        break;
 
      case 0x11: // Removal cost multiplier
        housespec->removal_cost = buf->ReadByte();
        break;
 
      case 0x12: // Building name ID
        AddStringForMapping(buf->ReadWord(), &housespec->building_name);
        break;
 
      case 0x13: // Building availability mask
        housespec->building_availability = (HouseZones)buf->ReadWord();
        break;
 
      case 0x14: // House callback mask
        housespec->callback_mask |= buf->ReadByte();
        break;
 
      case 0x15: { // House override byte
        byte override = buf->ReadByte();
 
        /* The house being overridden must be an original house. */
        if (override >= NEW_HOUSE_OFFSET) {
          grfmsg(2, "TownHouseChangeInfo: Attempt to override new house %u with house id %u. Ignoring.", override, hid + i);
          continue;
        }
 
        _house_mngr.Add(hid + i, _cur.grffile->grfid, override);
        break;
      }
 
      case 0x16: // Periodic refresh multiplier
        housespec->processing_time = std::min<byte>(buf->ReadByte(), 63u);
        break;
 
      case 0x17: // Four random colours to use
        for (uint j = 0; j < 4; j++) housespec->random_colour[j] = buf->ReadByte();
        break;
 
      case 0x18: // Relative probability of appearing
        housespec->probability = buf->ReadByte();
        break;
 
      case 0x19: // Extra flags
        housespec->extra_flags = (HouseExtraFlags)buf->ReadByte();
        break;
 
      case 0x1A: // Animation frames
        housespec->animation.frames = buf->ReadByte();
        housespec->animation.status = GB(housespec->animation.frames, 7, 1);
        SB(housespec->animation.frames, 7, 1, 0);
        break;
 
      case 0x1B: // Animation speed
        housespec->animation.speed = Clamp(buf->ReadByte(), 2, 16);
        break;
 
      case 0x1C: // Class of the building type
        housespec->class_id = AllocateHouseClassID(buf->ReadByte(), _cur.grffile->grfid);
        break;
 
      case 0x1D: // Callback mask part 2
        housespec->callback_mask |= (buf->ReadByte() << 8);
        break;
 
      case 0x1E: { // Accepted cargo types
        uint32 cargotypes = buf->ReadDWord();
 
        /* Check if the cargo types should not be changed */
        if (cargotypes == 0xFFFFFFFF) break;
 
        for (uint j = 0; j < 3; j++) {
          /* Get the cargo number from the 'list' */
          uint8 cargo_part = GB(cargotypes, 8 * j, 8);
          CargoID cargo = GetCargoTranslation(cargo_part, _cur.grffile);
 
          if (cargo == CT_INVALID) {
            /* Disable acceptance of invalid cargo type */
            housespec->cargo_acceptance[j] = 0;
          } else {
            housespec->accepts_cargo[j] = cargo;
          }
        }
        break;
      }
 
      case 0x1F: // Minimum life span
        housespec->minimum_life = buf->ReadByte();
        break;
 
      case 0x20: { // Cargo acceptance watch list
        byte count = buf->ReadByte();
        for (byte j = 0; j < count; j++) {
          CargoID cargo = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
          if (cargo != CT_INVALID) SetBit(housespec->watched_cargoes, cargo);
        }
        break;
      }
 
      case 0x21: // long introduction year
        housespec->min_year = buf->ReadWord();
        break;
 
      case 0x22: // long maximum year
        housespec->max_year = buf->ReadWord();
        break;
 
      case 0x23: { // variable length cargo types accepted
        uint count = buf->ReadByte();
        if (count > lengthof(housespec->accepts_cargo)) {
          GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
          error->param_value[1] = prop;
          return CIR_DISABLED;
        }
        /* Always write the full accepts_cargo array, and check each index for being inside the
         * provided data. This ensures all values are properly initialized, and also avoids
         * any risks of array overrun. */
        for (uint i = 0; i < lengthof(housespec->accepts_cargo); i++) {
          if (i < count) {
            housespec->accepts_cargo[i] = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
            housespec->cargo_acceptance[i] = buf->ReadByte();
          } else {
            housespec->accepts_cargo[i] = CT_INVALID;
            housespec->cargo_acceptance[i] = 0;
          }
        }
        break;
      }
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
/* static */ const LanguageMap *LanguageMap::GetLanguageMap(uint32 grfid, uint8 language_id)
{
  /* LanguageID "MAX_LANG", i.e. 7F is any. This language can't have a gender/case mapping, but has to be handled gracefully. */
  const GRFFile *grffile = GetFileByGRFID(grfid);
  return (grffile != nullptr && grffile->language_map != nullptr && language_id < MAX_LANG) ? &grffile->language_map[language_id] : nullptr;
}
 
template <typename T>
static ChangeInfoResult LoadTranslationTable(uint gvid, int numinfo, ByteReader *buf, T &translation_table, const char *name)
{
  if (gvid != 0) {
    grfmsg(1, "LoadTranslationTable: %s translation table must start at zero", name);
    return CIR_INVALID_ID;
  }
 
  translation_table.clear();
  for (int i = 0; i < numinfo; i++) {
    uint32 item = buf->ReadDWord();
    translation_table.push_back(BSWAP32(item));
  }
 
  return CIR_SUCCESS;
}
 
static std::string ReadDWordAsString(ByteReader *reader)
{
  char output[5];
  for (int i = 0; i < 4; i++) output[i] = reader->ReadByte();
  output[4] = '\0';
  StrMakeValidInPlace(output, lastof(output));
 
  return std::string(output);
}
 
static ChangeInfoResult GlobalVarChangeInfo(uint gvid, int numinfo, int prop, ByteReader *buf)
{
  /* Properties which are handled as a whole */
  switch (prop) {
    case 0x09: // Cargo Translation Table; loading during both reservation and activation stage (in case it is selected depending on defined cargos)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->cargo_list, "Cargo");
 
    case 0x12: // Rail type translation table; loading during both reservation and activation stage (in case it is selected depending on defined railtypes)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->railtype_list, "Rail type");
 
    case 0x16: // Road type translation table; loading during both reservation and activation stage (in case it is selected depending on defined railtypes)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->roadtype_list, "Road type");
 
    case 0x17: // Tram type translation table; loading during both reservation and activation stage (in case it is selected depending on defined railtypes)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->tramtype_list, "Tram type");
 
    default:
      break;
  }
 
  /* Properties which are handled per item */
  ChangeInfoResult ret = CIR_SUCCESS;
  for (int i = 0; i < numinfo; i++) {
    switch (prop) {
      case 0x08: { // Cost base factor
        int factor = buf->ReadByte();
        uint price = gvid + i;
 
        if (price < PR_END) {
          _cur.grffile->price_base_multipliers[price] = std::min<int>(factor - 8, MAX_PRICE_MODIFIER);
        } else {
          grfmsg(1, "GlobalVarChangeInfo: Price %d out of range, ignoring", price);
        }
        break;
      }
 
      case 0x0A: { // Currency display names
        uint curidx = GetNewgrfCurrencyIdConverted(gvid + i);
        StringID newone = GetGRFStringID(_cur.grffile->grfid, buf->ReadWord());
 
        if ((newone != STR_UNDEFINED) && (curidx < CURRENCY_END)) {
          _currency_specs[curidx].name = newone;
        }
        break;
      }
 
      case 0x0B: { // Currency multipliers
        uint curidx = GetNewgrfCurrencyIdConverted(gvid + i);
        uint32 rate = buf->ReadDWord();
 
        if (curidx < CURRENCY_END) {
          /* TTDPatch uses a multiple of 1000 for its conversion calculations,
           * which OTTD does not. For this reason, divide grf value by 1000,
           * to be compatible */
          _currency_specs[curidx].rate = rate / 1000;
        } else {
          grfmsg(1, "GlobalVarChangeInfo: Currency multipliers %d out of range, ignoring", curidx);
        }
        break;
      }
 
      case 0x0C: { // Currency options
        uint curidx = GetNewgrfCurrencyIdConverted(gvid + i);
        uint16 options = buf->ReadWord();
 
        if (curidx < CURRENCY_END) {
          _currency_specs[curidx].separator.clear();
          _currency_specs[curidx].separator.push_back(GB(options, 0, 8));
          /* By specifying only one bit, we prevent errors,
           * since newgrf specs said that only 0 and 1 can be set for symbol_pos */
          _currency_specs[curidx].symbol_pos = GB(options, 8, 1);
        } else {
          grfmsg(1, "GlobalVarChangeInfo: Currency option %d out of range, ignoring", curidx);
        }
        break;
      }
 
      case 0x0D: { // Currency prefix symbol
        uint curidx = GetNewgrfCurrencyIdConverted(gvid + i);
        std::string prefix = ReadDWordAsString(buf);
 
        if (curidx < CURRENCY_END) {
          _currency_specs[curidx].prefix = prefix;
        } else {
          grfmsg(1, "GlobalVarChangeInfo: Currency symbol %d out of range, ignoring", curidx);
        }
        break;
      }
 
      case 0x0E: { // Currency suffix symbol
        uint curidx = GetNewgrfCurrencyIdConverted(gvid + i);
        std::string suffix = ReadDWordAsString(buf);
 
        if (curidx < CURRENCY_END) {
          _currency_specs[curidx].suffix = suffix;
        } else {
          grfmsg(1, "GlobalVarChangeInfo: Currency symbol %d out of range, ignoring", curidx);
        }
        break;
      }
 
      case 0x0F: { //  Euro introduction dates
        uint curidx = GetNewgrfCurrencyIdConverted(gvid + i);
        Year year_euro = buf->ReadWord();
 
        if (curidx < CURRENCY_END) {
          _currency_specs[curidx].to_euro = year_euro;
        } else {
          grfmsg(1, "GlobalVarChangeInfo: Euro intro date %d out of range, ignoring", curidx);
        }
        break;
      }
 
      case 0x10: // Snow line height table
        if (numinfo > 1 || IsSnowLineSet()) {
          grfmsg(1, "GlobalVarChangeInfo: The snowline can only be set once (%d)", numinfo);
        } else if (buf->Remaining() < SNOW_LINE_MONTHS * SNOW_LINE_DAYS) {
          grfmsg(1, "GlobalVarChangeInfo: Not enough entries set in the snowline table (" PRINTF_SIZE ")", buf->Remaining());
        } else {
          byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS];
 
          for (uint i = 0; i < SNOW_LINE_MONTHS; i++) {
            for (uint j = 0; j < SNOW_LINE_DAYS; j++) {
              table[i][j] = buf->ReadByte();
              if (_cur.grffile->grf_version >= 8) {
                if (table[i][j] != 0xFF) table[i][j] = table[i][j] * (1 + _settings_game.construction.map_height_limit) / 256;
              } else {
                if (table[i][j] >= 128) {
                  /* no snow */
                  table[i][j] = 0xFF;
                } else {
                  table[i][j] = table[i][j] * (1 + _settings_game.construction.map_height_limit) / 128;
                }
              }
            }
          }
          SetSnowLine(table);
        }
        break;
 
      case 0x11: // GRF match for engine allocation
        /* This is loaded during the reservation stage, so just skip it here. */
        /* Each entry is 8 bytes. */
        buf->Skip(8);
        break;
 
      case 0x13:   // Gender translation table
      case 0x14:   // Case translation table
      case 0x15: { // Plural form translation
        uint curidx = gvid + i; // The current index, i.e. language.
        const LanguageMetadata *lang = curidx < MAX_LANG ? GetLanguage(curidx) : nullptr;
        if (lang == nullptr) {
          grfmsg(1, "GlobalVarChangeInfo: Language %d is not known, ignoring", curidx);
          /* Skip over the data. */
          if (prop == 0x15) {
            buf->ReadByte();
          } else {
            while (buf->ReadByte() != 0) {
              buf->ReadString();
            }
          }
          break;
        }
 
        if (_cur.grffile->language_map == nullptr) _cur.grffile->language_map = new LanguageMap[MAX_LANG];
 
        if (prop == 0x15) {
          uint plural_form = buf->ReadByte();
          if (plural_form >= LANGUAGE_MAX_PLURAL) {
            grfmsg(1, "GlobalVarChanceInfo: Plural form %d is out of range, ignoring", plural_form);
          } else {
            _cur.grffile->language_map[curidx].plural_form = plural_form;
          }
          break;
        }
 
        byte newgrf_id = buf->ReadByte(); // The NewGRF (custom) identifier.
        while (newgrf_id != 0) {
          const char *name = buf->ReadString(); // The name for the OpenTTD identifier.
 
          /* We'll just ignore the UTF8 identifier character. This is (fairly)
           * safe as OpenTTD's strings gender/cases are usually in ASCII which
           * is just a subset of UTF8, or they need the bigger UTF8 characters
           * such as Cyrillic. Thus we will simply assume they're all UTF8. */
          WChar c;
          size_t len = Utf8Decode(&c, name);
          if (c == NFO_UTF8_IDENTIFIER) name += len;
 
          LanguageMap::Mapping map;
          map.newgrf_id = newgrf_id;
          if (prop == 0x13) {
            map.openttd_id = lang->GetGenderIndex(name);
            if (map.openttd_id >= MAX_NUM_GENDERS) {
              grfmsg(1, "GlobalVarChangeInfo: Gender name %s is not known, ignoring", name);
            } else {
              _cur.grffile->language_map[curidx].gender_map.push_back(map);
            }
          } else {
            map.openttd_id = lang->GetCaseIndex(name);
            if (map.openttd_id >= MAX_NUM_CASES) {
              grfmsg(1, "GlobalVarChangeInfo: Case name %s is not known, ignoring", name);
            } else {
              _cur.grffile->language_map[curidx].case_map.push_back(map);
            }
          }
          newgrf_id = buf->ReadByte();
        }
        break;
      }
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult GlobalVarReserveInfo(uint gvid, int numinfo, int prop, ByteReader *buf)
{
  /* Properties which are handled as a whole */
  switch (prop) {
    case 0x09: // Cargo Translation Table; loading during both reservation and activation stage (in case it is selected depending on defined cargos)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->cargo_list, "Cargo");
 
    case 0x12: // Rail type translation table; loading during both reservation and activation stage (in case it is selected depending on defined railtypes)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->railtype_list, "Rail type");
 
    case 0x16: // Road type translation table; loading during both reservation and activation stage (in case it is selected depending on defined roadtypes)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->roadtype_list, "Road type");
 
    case 0x17: // Tram type translation table; loading during both reservation and activation stage (in case it is selected depending on defined tramtypes)
      return LoadTranslationTable(gvid, numinfo, buf, _cur.grffile->tramtype_list, "Tram type");
 
    default:
      break;
  }
 
  /* Properties which are handled per item */
  ChangeInfoResult ret = CIR_SUCCESS;
  for (int i = 0; i < numinfo; i++) {
    switch (prop) {
      case 0x08: // Cost base factor
      case 0x15: // Plural form translation
        buf->ReadByte();
        break;
 
      case 0x0A: // Currency display names
      case 0x0C: // Currency options
      case 0x0F: // Euro introduction dates
        buf->ReadWord();
        break;
 
      case 0x0B: // Currency multipliers
      case 0x0D: // Currency prefix symbol
      case 0x0E: // Currency suffix symbol
        buf->ReadDWord();
        break;
 
      case 0x10: // Snow line height table
        buf->Skip(SNOW_LINE_MONTHS * SNOW_LINE_DAYS);
        break;
 
      case 0x11: { // GRF match for engine allocation
        uint32 s = buf->ReadDWord();
        uint32 t = buf->ReadDWord();
        SetNewGRFOverride(s, t);
        break;
      }
 
      case 0x13: // Gender translation table
      case 0x14: // Case translation table
        while (buf->ReadByte() != 0) {
          buf->ReadString();
        }
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
 
static ChangeInfoResult CargoChangeInfo(uint cid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (cid + numinfo > NUM_CARGO) {
    grfmsg(2, "CargoChangeInfo: Cargo type %d out of range (max %d)", cid + numinfo, NUM_CARGO - 1);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    CargoSpec *cs = CargoSpec::Get(cid + i);
 
    switch (prop) {
      case 0x08: // Bit number of cargo
        cs->bitnum = buf->ReadByte();
        if (cs->IsValid()) {
          cs->grffile = _cur.grffile;
          SetBit(_cargo_mask, cid + i);
        } else {
          ClrBit(_cargo_mask, cid + i);
        }
        break;
 
      case 0x09: // String ID for cargo type name
        AddStringForMapping(buf->ReadWord(), &cs->name);
        break;
 
      case 0x0A: // String for 1 unit of cargo
        AddStringForMapping(buf->ReadWord(), &cs->name_single);
        break;
 
      case 0x0B: // String for singular quantity of cargo (e.g. 1 tonne of coal)
      case 0x1B: // String for cargo units
        /* String for units of cargo. This is different in OpenTTD
         * (e.g. tonnes) to TTDPatch (e.g. {COMMA} tonne of coal).
         * Property 1B is used to set OpenTTD's behaviour. */
        AddStringForMapping(buf->ReadWord(), &cs->units_volume);
        break;
 
      case 0x0C: // String for plural quantity of cargo (e.g. 10 tonnes of coal)
      case 0x1C: // String for any amount of cargo
        /* Strings for an amount of cargo. This is different in OpenTTD
         * (e.g. {WEIGHT} of coal) to TTDPatch (e.g. {COMMA} tonnes of coal).
         * Property 1C is used to set OpenTTD's behaviour. */
        AddStringForMapping(buf->ReadWord(), &cs->quantifier);
        break;
 
      case 0x0D: // String for two letter cargo abbreviation
        AddStringForMapping(buf->ReadWord(), &cs->abbrev);
        break;
 
      case 0x0E: // Sprite ID for cargo icon
        cs->sprite = buf->ReadWord();
        break;
 
      case 0x0F: // Weight of one unit of cargo
        cs->weight = buf->ReadByte();
        break;
 
      case 0x10: // Used for payment calculation
        cs->transit_days[0] = buf->ReadByte();
        break;
 
      case 0x11: // Used for payment calculation
        cs->transit_days[1] = buf->ReadByte();
        break;
 
      case 0x12: // Base cargo price
        cs->initial_payment = buf->ReadDWord();
        break;
 
      case 0x13: // Colour for station rating bars
        cs->rating_colour = buf->ReadByte();
        break;
 
      case 0x14: // Colour for cargo graph
        cs->legend_colour = buf->ReadByte();
        break;
 
      case 0x15: // Freight status
        cs->is_freight = (buf->ReadByte() != 0);
        break;
 
      case 0x16: // Cargo classes
        cs->classes = buf->ReadWord();
        break;
 
      case 0x17: // Cargo label
        cs->label = buf->ReadDWord();
        cs->label = BSWAP32(cs->label);
        break;
 
      case 0x18: { // Town growth substitute type
        uint8 substitute_type = buf->ReadByte();
 
        switch (substitute_type) {
          case 0x00: cs->town_effect = TE_PASSENGERS; break;
          case 0x02: cs->town_effect = TE_MAIL; break;
          case 0x05: cs->town_effect = TE_GOODS; break;
          case 0x09: cs->town_effect = TE_WATER; break;
          case 0x0B: cs->town_effect = TE_FOOD; break;
          default:
            grfmsg(1, "CargoChangeInfo: Unknown town growth substitute value %d, setting to none.", substitute_type);
            FALLTHROUGH;
          case 0xFF: cs->town_effect = TE_NONE; break;
        }
        break;
      }
 
      case 0x19: // Town growth coefficient
        buf->ReadWord();
        break;
 
      case 0x1A: // Bitmask of callbacks to use
        cs->callback_mask = buf->ReadByte();
        break;
 
      case 0x1D: // Vehicle capacity muliplier
        cs->multiplier = std::max<uint16>(1u, buf->ReadWord());
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
 
static ChangeInfoResult SoundEffectChangeInfo(uint sid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (_cur.grffile->sound_offset == 0) {
    grfmsg(1, "SoundEffectChangeInfo: No effects defined, skipping");
    return CIR_INVALID_ID;
  }
 
  if (sid + numinfo - ORIGINAL_SAMPLE_COUNT > _cur.grffile->num_sounds) {
    grfmsg(1, "SoundEffectChangeInfo: Attempting to change undefined sound effect (%u), max (%u). Ignoring.", sid + numinfo, ORIGINAL_SAMPLE_COUNT + _cur.grffile->num_sounds);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    SoundEntry *sound = GetSound(sid + i + _cur.grffile->sound_offset - ORIGINAL_SAMPLE_COUNT);
 
    switch (prop) {
      case 0x08: // Relative volume
        sound->volume = buf->ReadByte();
        break;
 
      case 0x09: // Priority
        sound->priority = buf->ReadByte();
        break;
 
      case 0x0A: { // Override old sound
        SoundID orig_sound = buf->ReadByte();
 
        if (orig_sound >= ORIGINAL_SAMPLE_COUNT) {
          grfmsg(1, "SoundEffectChangeInfo: Original sound %d not defined (max %d)", orig_sound, ORIGINAL_SAMPLE_COUNT);
        } else {
          SoundEntry *old_sound = GetSound(orig_sound);
 
          /* Literally copy the data of the new sound over the original */
          *old_sound = *sound;
        }
        break;
      }
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult IgnoreIndustryTileProperty(int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  switch (prop) {
    case 0x09:
    case 0x0D:
    case 0x0E:
    case 0x10:
    case 0x11:
    case 0x12:
      buf->ReadByte();
      break;
 
    case 0x0A:
    case 0x0B:
    case 0x0C:
    case 0x0F:
      buf->ReadWord();
      break;
 
    case 0x13:
      buf->Skip(buf->ReadByte() * 2);
      break;
 
    default:
      ret = CIR_UNKNOWN;
      break;
  }
  return ret;
}
 
static ChangeInfoResult IndustrytilesChangeInfo(uint indtid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (indtid + numinfo > NUM_INDUSTRYTILES_PER_GRF) {
    grfmsg(1, "IndustryTilesChangeInfo: Too many industry tiles loaded (%u), max (%u). Ignoring.", indtid + numinfo, NUM_INDUSTRYTILES_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate industry tile specs if they haven't been allocated already. */
  if (_cur.grffile->indtspec == nullptr) {
    _cur.grffile->indtspec = CallocT<IndustryTileSpec*>(NUM_INDUSTRYTILES_PER_GRF);
  }
 
  for (int i = 0; i < numinfo; i++) {
    IndustryTileSpec *tsp = _cur.grffile->indtspec[indtid + i];
 
    if (prop != 0x08 && tsp == nullptr) {
      ChangeInfoResult cir = IgnoreIndustryTileProperty(prop, buf);
      if (cir > ret) ret = cir;
      continue;
    }
 
    switch (prop) {
      case 0x08: { // Substitute industry tile type
        IndustryTileSpec **tilespec = &_cur.grffile->indtspec[indtid + i];
        byte subs_id = buf->ReadByte();
 
        if (subs_id >= NEW_INDUSTRYTILEOFFSET) {
          /* The substitute id must be one of the original industry tile. */
          grfmsg(2, "IndustryTilesChangeInfo: Attempt to use new industry tile %u as substitute industry tile for %u. Ignoring.", subs_id, indtid + i);
          continue;
        }
 
        /* Allocate space for this industry. */
        if (*tilespec == nullptr) {
          *tilespec = CallocT<IndustryTileSpec>(1);
          tsp = *tilespec;
 
          memcpy(tsp, &_industry_tile_specs[subs_id], sizeof(_industry_tile_specs[subs_id]));
          tsp->enabled = true;
 
          /* A copied tile should not have the animation infos copied too.
           * The anim_state should be left untouched, though
           * It is up to the author to animate them */
          tsp->anim_production = INDUSTRYTILE_NOANIM;
          tsp->anim_next = INDUSTRYTILE_NOANIM;
 
          tsp->grf_prop.local_id = indtid + i;
          tsp->grf_prop.subst_id = subs_id;
          tsp->grf_prop.grffile = _cur.grffile;
          _industile_mngr.AddEntityID(indtid + i, _cur.grffile->grfid, subs_id); // pre-reserve the tile slot
        }
        break;
      }
 
      case 0x09: { // Industry tile override
        byte ovrid = buf->ReadByte();
 
        /* The industry being overridden must be an original industry. */
        if (ovrid >= NEW_INDUSTRYTILEOFFSET) {
          grfmsg(2, "IndustryTilesChangeInfo: Attempt to override new industry tile %u with industry tile id %u. Ignoring.", ovrid, indtid + i);
          continue;
        }
 
        _industile_mngr.Add(indtid + i, _cur.grffile->grfid, ovrid);
        break;
      }
 
      case 0x0A: // Tile acceptance
      case 0x0B:
      case 0x0C: {
        uint16 acctp = buf->ReadWord();
        tsp->accepts_cargo[prop - 0x0A] = GetCargoTranslation(GB(acctp, 0, 8), _cur.grffile);
        tsp->acceptance[prop - 0x0A] = Clamp(GB(acctp, 8, 8), 0, 16);
        break;
      }
 
      case 0x0D: // Land shape flags
        tsp->slopes_refused = (Slope)buf->ReadByte();
        break;
 
      case 0x0E: // Callback mask
        tsp->callback_mask = buf->ReadByte();
        break;
 
      case 0x0F: // Animation information
        tsp->animation.frames = buf->ReadByte();
        tsp->animation.status = buf->ReadByte();
        break;
 
      case 0x10: // Animation speed
        tsp->animation.speed = buf->ReadByte();
        break;
 
      case 0x11: // Triggers for callback 25
        tsp->animation.triggers = buf->ReadByte();
        break;
 
      case 0x12: // Special flags
        tsp->special_flags = (IndustryTileSpecialFlags)buf->ReadByte();
        break;
 
      case 0x13: { // variable length cargo acceptance
        byte num_cargoes = buf->ReadByte();
        if (num_cargoes > lengthof(tsp->acceptance)) {
          GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
          error->param_value[1] = prop;
          return CIR_DISABLED;
        }
        for (uint i = 0; i < lengthof(tsp->acceptance); i++) {
          if (i < num_cargoes) {
            tsp->accepts_cargo[i] = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
            /* Tile acceptance can be negative to counteract the INDTILE_SPECIAL_ACCEPTS_ALL_CARGO flag */
            tsp->acceptance[i] = (int8)buf->ReadByte();
          } else {
            tsp->accepts_cargo[i] = CT_INVALID;
            tsp->acceptance[i] = 0;
          }
        }
        break;
      }
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult IgnoreIndustryProperty(int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  switch (prop) {
    case 0x09:
    case 0x0B:
    case 0x0F:
    case 0x12:
    case 0x13:
    case 0x14:
    case 0x17:
    case 0x18:
    case 0x19:
    case 0x21:
    case 0x22:
      buf->ReadByte();
      break;
 
    case 0x0C:
    case 0x0D:
    case 0x0E:
    case 0x10:
    case 0x1B:
    case 0x1F:
    case 0x24:
      buf->ReadWord();
      break;
 
    case 0x11:
    case 0x1A:
    case 0x1C:
    case 0x1D:
    case 0x1E:
    case 0x20:
    case 0x23:
      buf->ReadDWord();
      break;
 
    case 0x0A: {
      byte num_table = buf->ReadByte();
      for (byte j = 0; j < num_table; j++) {
        for (uint k = 0;; k++) {
          byte x = buf->ReadByte();
          if (x == 0xFE && k == 0) {
            buf->ReadByte();
            buf->ReadByte();
            break;
          }
 
          byte y = buf->ReadByte();
          if (x == 0 && y == 0x80) break;
 
          byte gfx = buf->ReadByte();
          if (gfx == 0xFE) buf->ReadWord();
        }
      }
      break;
    }
 
    case 0x16:
      for (byte j = 0; j < 3; j++) buf->ReadByte();
      break;
 
    case 0x15:
    case 0x25:
    case 0x26:
    case 0x27:
      buf->Skip(buf->ReadByte());
      break;
 
    case 0x28: {
      int num_inputs = buf->ReadByte();
      int num_outputs = buf->ReadByte();
      buf->Skip(num_inputs * num_outputs * 2);
      break;
    }
 
    default:
      ret = CIR_UNKNOWN;
      break;
  }
  return ret;
}
 
static bool ValidateIndustryLayout(const IndustryTileLayout &layout)
{
  const size_t size = layout.size();
  if (size == 0) return false;
 
  for (size_t i = 0; i < size - 1; i++) {
    for (size_t j = i + 1; j < size; j++) {
      if (layout[i].ti.x == layout[j].ti.x &&
          layout[i].ti.y == layout[j].ti.y) {
        return false;
      }
    }
  }
 
  bool have_regular_tile = false;
  for (size_t i = 0; i < size; i++) {
    if (layout[i].gfx != GFX_WATERTILE_SPECIALCHECK) {
      have_regular_tile = true;
      break;
    }
  }
 
  return have_regular_tile;
}
 
static ChangeInfoResult IndustriesChangeInfo(uint indid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (indid + numinfo > NUM_INDUSTRYTYPES_PER_GRF) {
    grfmsg(1, "IndustriesChangeInfo: Too many industries loaded (%u), max (%u). Ignoring.", indid + numinfo, NUM_INDUSTRYTYPES_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate industry specs if they haven't been allocated already. */
  if (_cur.grffile->industryspec == nullptr) {
    _cur.grffile->industryspec = CallocT<IndustrySpec*>(NUM_INDUSTRYTYPES_PER_GRF);
  }
 
  for (int i = 0; i < numinfo; i++) {
    IndustrySpec *indsp = _cur.grffile->industryspec[indid + i];
 
    if (prop != 0x08 && indsp == nullptr) {
      ChangeInfoResult cir = IgnoreIndustryProperty(prop, buf);
      if (cir > ret) ret = cir;
      continue;
    }
 
    switch (prop) {
      case 0x08: { // Substitute industry type
        IndustrySpec **indspec = &_cur.grffile->industryspec[indid + i];
        byte subs_id = buf->ReadByte();
 
        if (subs_id == 0xFF) {
          /* Instead of defining a new industry, a substitute industry id
           * of 0xFF disables the old industry with the current id. */
          _industry_specs[indid + i].enabled = false;
          continue;
        } else if (subs_id >= NEW_INDUSTRYOFFSET) {
          /* The substitute id must be one of the original industry. */
          grfmsg(2, "_industry_specs: Attempt to use new industry %u as substitute industry for %u. Ignoring.", subs_id, indid + i);
          continue;
        }
 
        /* Allocate space for this industry.
         * Only need to do it once. If ever it is called again, it should not
         * do anything */
        if (*indspec == nullptr) {
          *indspec = new IndustrySpec;
          indsp = *indspec;
 
          *indsp = _origin_industry_specs[subs_id];
          indsp->enabled = true;
          indsp->grf_prop.local_id = indid + i;
          indsp->grf_prop.subst_id = subs_id;
          indsp->grf_prop.grffile = _cur.grffile;
          /* If the grf industry needs to check its surrounding upon creation, it should
           * rely on callbacks, not on the original placement functions */
          indsp->check_proc = CHECK_NOTHING;
        }
        break;
      }
 
      case 0x09: { // Industry type override
        byte ovrid = buf->ReadByte();
 
        /* The industry being overridden must be an original industry. */
        if (ovrid >= NEW_INDUSTRYOFFSET) {
          grfmsg(2, "IndustriesChangeInfo: Attempt to override new industry %u with industry id %u. Ignoring.", ovrid, indid + i);
          continue;
        }
        indsp->grf_prop.override = ovrid;
        _industry_mngr.Add(indid + i, _cur.grffile->grfid, ovrid);
        break;
      }
 
      case 0x0A: { // Set industry layout(s)
        byte new_num_layouts = buf->ReadByte();
        uint32 definition_size = buf->ReadDWord();
        uint32 bytes_read = 0;
        std::vector<IndustryTileLayout> new_layouts;
        IndustryTileLayout layout;
 
        for (byte j = 0; j < new_num_layouts; j++) {
          layout.clear();
 
          for (uint k = 0;; k++) {
            if (bytes_read >= definition_size) {
              grfmsg(3, "IndustriesChangeInfo: Incorrect size for industry tile layout definition for industry %u.", indid);
              /* Avoid warning twice */
              definition_size = UINT32_MAX;
            }
 
            layout.push_back(IndustryTileLayoutTile{});
            IndustryTileLayoutTile &it = layout.back();
 
            it.ti.x = buf->ReadByte(); // Offsets from northermost tile
            ++bytes_read;
 
            if (it.ti.x == 0xFE && k == 0) {
              /* This means we have to borrow the layout from an old industry */
              IndustryType type = buf->ReadByte();
              byte laynbr = buf->ReadByte();
              bytes_read += 2;
 
              if (type >= lengthof(_origin_industry_specs)) {
                grfmsg(1, "IndustriesChangeInfo: Invalid original industry number for layout import, industry %u", indid);
                DisableGrf(STR_NEWGRF_ERROR_INVALID_ID);
                return CIR_DISABLED;
              }
              if (laynbr >= _origin_industry_specs[type].layouts.size()) {
                grfmsg(1, "IndustriesChangeInfo: Invalid original industry layout index for layout import, industry %u", indid);
                DisableGrf(STR_NEWGRF_ERROR_INVALID_ID);
                return CIR_DISABLED;
              }
              layout = _origin_industry_specs[type].layouts[laynbr];
              break;
            }
 
            it.ti.y = buf->ReadByte(); // Or table definition finalisation
            ++bytes_read;
 
            if (it.ti.x == 0 && it.ti.y == 0x80) {
              /* Terminator, remove and finish up */
              layout.pop_back();
              break;
            }
 
            it.gfx = buf->ReadByte();
            ++bytes_read;
 
            if (it.gfx == 0xFE) {
              /* Use a new tile from this GRF */
              int local_tile_id = buf->ReadWord();
              bytes_read += 2;
 
              /* Read the ID from the _industile_mngr. */
              int tempid = _industile_mngr.GetID(local_tile_id, _cur.grffile->grfid);
 
              if (tempid == INVALID_INDUSTRYTILE) {
                grfmsg(2, "IndustriesChangeInfo: Attempt to use industry tile %u with industry id %u, not yet defined. Ignoring.", local_tile_id, indid);
              } else {
                /* Declared as been valid, can be used */
                it.gfx = tempid;
              }
            } else if (it.gfx == GFX_WATERTILE_SPECIALCHECK) {
              it.ti.x = (int8)GB(it.ti.x, 0, 8);
              it.ti.y = (int8)GB(it.ti.y, 0, 8);
 
              /* When there were only 256x256 maps, TileIndex was a uint16 and
                * it.ti was just a TileIndexDiff that was added to it.
                * As such negative "x" values were shifted into the "y" position.
                *   x = -1, y = 1 -> x = 255, y = 0
                * Since GRF version 8 the position is interpreted as pair of independent int8.
                * For GRF version < 8 we need to emulate the old shifting behaviour.
                */
              if (_cur.grffile->grf_version < 8 && it.ti.x < 0) it.ti.y += 1;
            }
          }
 
          if (!ValidateIndustryLayout(layout)) {
            /* The industry layout was not valid, so skip this one. */
            grfmsg(1, "IndustriesChangeInfo: Invalid industry layout for industry id %u. Ignoring", indid);
            new_num_layouts--;
            j--;
          } else {
            new_layouts.push_back(layout);
          }
        }
 
        /* Install final layout construction in the industry spec */
        indsp->layouts = new_layouts;
        break;
      }
 
      case 0x0B: // Industry production flags
        indsp->life_type = (IndustryLifeType)buf->ReadByte();
        break;
 
      case 0x0C: // Industry closure message
        AddStringForMapping(buf->ReadWord(), &indsp->closure_text);
        break;
 
      case 0x0D: // Production increase message
        AddStringForMapping(buf->ReadWord(), &indsp->production_up_text);
        break;
 
      case 0x0E: // Production decrease message
        AddStringForMapping(buf->ReadWord(), &indsp->production_down_text);
        break;
 
      case 0x0F: // Fund cost multiplier
        indsp->cost_multiplier = buf->ReadByte();
        break;
 
      case 0x10: // Production cargo types
        for (byte j = 0; j < 2; j++) {
          indsp->produced_cargo[j] = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
        }
        break;
 
      case 0x11: // Acceptance cargo types
        for (byte j = 0; j < 3; j++) {
          indsp->accepts_cargo[j] = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
        }
        buf->ReadByte(); // Unnused, eat it up
        break;
 
      case 0x12: // Production multipliers
      case 0x13:
        indsp->production_rate[prop - 0x12] = buf->ReadByte();
        break;
 
      case 0x14: // Minimal amount of cargo distributed
        indsp->minimal_cargo = buf->ReadByte();
        break;
 
      case 0x15: { // Random sound effects
        indsp->number_of_sounds = buf->ReadByte();
        uint8 *sounds = MallocT<uint8>(indsp->number_of_sounds);
 
        try {
          for (uint8 j = 0; j < indsp->number_of_sounds; j++) {
            sounds[j] = buf->ReadByte();
          }
        } catch (...) {
          free(sounds);
          throw;
        }
 
        if (HasBit(indsp->cleanup_flag, CLEAN_RANDOMSOUNDS)) {
          free(indsp->random_sounds);
        }
        indsp->random_sounds = sounds;
        SetBit(indsp->cleanup_flag, CLEAN_RANDOMSOUNDS);
        break;
      }
 
      case 0x16: // Conflicting industry types
        for (byte j = 0; j < 3; j++) indsp->conflicting[j] = buf->ReadByte();
        break;
 
      case 0x17: // Probability in random game
        indsp->appear_creation[_settings_game.game_creation.landscape] = buf->ReadByte();
        break;
 
      case 0x18: // Probability during gameplay
        indsp->appear_ingame[_settings_game.game_creation.landscape] = buf->ReadByte();
        break;
 
      case 0x19: // Map colour
        indsp->map_colour = buf->ReadByte();
        break;
 
      case 0x1A: // Special industry flags to define special behavior
        indsp->behaviour = (IndustryBehaviour)buf->ReadDWord();
        break;
 
      case 0x1B: // New industry text ID
        AddStringForMapping(buf->ReadWord(), &indsp->new_industry_text);
        break;
 
      case 0x1C: // Input cargo multipliers for the three input cargo types
      case 0x1D:
      case 0x1E: {
          uint32 multiples = buf->ReadDWord();
          indsp->input_cargo_multiplier[prop - 0x1C][0] = GB(multiples, 0, 16);
          indsp->input_cargo_multiplier[prop - 0x1C][1] = GB(multiples, 16, 16);
          break;
        }
 
      case 0x1F: // Industry name
        AddStringForMapping(buf->ReadWord(), &indsp->name);
        break;
 
      case 0x20: // Prospecting success chance
        indsp->prospecting_chance = buf->ReadDWord();
        break;
 
      case 0x21:   // Callback mask
      case 0x22: { // Callback additional mask
        byte aflag = buf->ReadByte();
        SB(indsp->callback_mask, (prop - 0x21) * 8, 8, aflag);
        break;
      }
 
      case 0x23: // removal cost multiplier
        indsp->removal_cost_multiplier = buf->ReadDWord();
        break;
 
      case 0x24: { // name for nearby station
        uint16 str = buf->ReadWord();
        if (str == 0) {
          indsp->station_name = STR_NULL;
        } else {
          AddStringForMapping(str, &indsp->station_name);
        }
        break;
      }
 
      case 0x25: { // variable length produced cargoes
        byte num_cargoes = buf->ReadByte();
        if (num_cargoes > lengthof(indsp->produced_cargo)) {
          GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
          error->param_value[1] = prop;
          return CIR_DISABLED;
        }
        for (uint i = 0; i < lengthof(indsp->produced_cargo); i++) {
          if (i < num_cargoes) {
            CargoID cargo = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
            indsp->produced_cargo[i] = cargo;
          } else {
            indsp->produced_cargo[i] = CT_INVALID;
          }
        }
        break;
      }
 
      case 0x26: { // variable length accepted cargoes
        byte num_cargoes = buf->ReadByte();
        if (num_cargoes > lengthof(indsp->accepts_cargo)) {
          GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
          error->param_value[1] = prop;
          return CIR_DISABLED;
        }
        for (uint i = 0; i < lengthof(indsp->accepts_cargo); i++) {
          if (i < num_cargoes) {
            CargoID cargo = GetCargoTranslation(buf->ReadByte(), _cur.grffile);
            indsp->accepts_cargo[i] = cargo;
          } else {
            indsp->accepts_cargo[i] = CT_INVALID;
          }
        }
        break;
      }
 
      case 0x27: { // variable length production rates
        byte num_cargoes = buf->ReadByte();
        if (num_cargoes > lengthof(indsp->production_rate)) {
          GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
          error->param_value[1] = prop;
          return CIR_DISABLED;
        }
        for (uint i = 0; i < lengthof(indsp->production_rate); i++) {
          if (i < num_cargoes) {
            indsp->production_rate[i] = buf->ReadByte();
          } else {
            indsp->production_rate[i] = 0;
          }
        }
        break;
      }
 
      case 0x28: { // variable size input/output production multiplier table
        byte num_inputs = buf->ReadByte();
        byte num_outputs = buf->ReadByte();
        if (num_inputs > lengthof(indsp->accepts_cargo) || num_outputs > lengthof(indsp->produced_cargo)) {
          GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LIST_PROPERTY_TOO_LONG);
          error->param_value[1] = prop;
          return CIR_DISABLED;
        }
        for (uint i = 0; i < lengthof(indsp->accepts_cargo); i++) {
          for (uint j = 0; j < lengthof(indsp->produced_cargo); j++) {
            uint16 mult = 0;
            if (i < num_inputs && j < num_outputs) mult = buf->ReadWord();
            indsp->input_cargo_multiplier[i][j] = mult;
          }
        }
        break;
      }
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static void DuplicateTileTable(AirportSpec *as)
{
  AirportTileTable **table_list = MallocT<AirportTileTable*>(as->num_table);
  for (int i = 0; i < as->num_table; i++) {
    uint num_tiles = 1;
    const AirportTileTable *it = as->table[0];
    do {
      num_tiles++;
    } while ((++it)->ti.x != -0x80);
    table_list[i] = MallocT<AirportTileTable>(num_tiles);
    MemCpyT(table_list[i], as->table[i], num_tiles);
  }
  as->table = table_list;
  HangarTileTable *depot_table = MallocT<HangarTileTable>(as->nof_depots);
  MemCpyT(depot_table, as->depot_table, as->nof_depots);
  as->depot_table = depot_table;
  Direction *rotation = MallocT<Direction>(as->num_table);
  MemCpyT(rotation, as->rotation, as->num_table);
  as->rotation = rotation;
}
 
static ChangeInfoResult AirportChangeInfo(uint airport, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (airport + numinfo > NUM_AIRPORTS_PER_GRF) {
    grfmsg(1, "AirportChangeInfo: Too many airports, trying id (%u), max (%u). Ignoring.", airport + numinfo, NUM_AIRPORTS_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate industry specs if they haven't been allocated already. */
  if (_cur.grffile->airportspec == nullptr) {
    _cur.grffile->airportspec = CallocT<AirportSpec*>(NUM_AIRPORTS_PER_GRF);
  }
 
  for (int i = 0; i < numinfo; i++) {
    AirportSpec *as = _cur.grffile->airportspec[airport + i];
 
    if (as == nullptr && prop != 0x08 && prop != 0x09) {
      grfmsg(2, "AirportChangeInfo: Attempt to modify undefined airport %u, ignoring", airport + i);
      return CIR_INVALID_ID;
    }
 
    switch (prop) {
      case 0x08: { // Modify original airport
        byte subs_id = buf->ReadByte();
 
        if (subs_id == 0xFF) {
          /* Instead of defining a new airport, an airport id
           * of 0xFF disables the old airport with the current id. */
          AirportSpec::GetWithoutOverride(airport + i)->enabled = false;
          continue;
        } else if (subs_id >= NEW_AIRPORT_OFFSET) {
          /* The substitute id must be one of the original airports. */
          grfmsg(2, "AirportChangeInfo: Attempt to use new airport %u as substitute airport for %u. Ignoring.", subs_id, airport + i);
          continue;
        }
 
        AirportSpec **spec = &_cur.grffile->airportspec[airport + i];
        /* Allocate space for this airport.
         * Only need to do it once. If ever it is called again, it should not
         * do anything */
        if (*spec == nullptr) {
          *spec = MallocT<AirportSpec>(1);
          as = *spec;
 
          memcpy(as, AirportSpec::GetWithoutOverride(subs_id), sizeof(*as));
          as->enabled = true;
          as->grf_prop.local_id = airport + i;
          as->grf_prop.subst_id = subs_id;
          as->grf_prop.grffile = _cur.grffile;
          /* override the default airport */
          _airport_mngr.Add(airport + i, _cur.grffile->grfid, subs_id);
          /* Create a copy of the original tiletable so it can be freed later. */
          DuplicateTileTable(as);
        }
        break;
      }
 
      case 0x0A: { // Set airport layout
        byte old_num_table = as->num_table;
        free(as->rotation);
        as->num_table = buf->ReadByte(); // Number of layaouts
        as->rotation = MallocT<Direction>(as->num_table);
        uint32 defsize = buf->ReadDWord();  // Total size of the definition
        AirportTileTable **tile_table = CallocT<AirportTileTable*>(as->num_table); // Table with tiles to compose the airport
        AirportTileTable *att = CallocT<AirportTileTable>(defsize); // Temporary array to read the tile layouts from the GRF
        int size;
        const AirportTileTable *copy_from;
        try {
          for (byte j = 0; j < as->num_table; j++) {
            const_cast<Direction&>(as->rotation[j]) = (Direction)buf->ReadByte();
            for (int k = 0;; k++) {
              att[k].ti.x = buf->ReadByte(); // Offsets from northermost tile
              att[k].ti.y = buf->ReadByte();
 
              if (att[k].ti.x == 0 && att[k].ti.y == 0x80) {
                /*  Not the same terminator.  The one we are using is rather
                 * x = -80, y = 0 .  So, adjust it. */
                att[k].ti.x = -0x80;
                att[k].ti.y =  0;
                att[k].gfx  =  0;
 
                size = k + 1;
                copy_from = att;
                break;
              }
 
              att[k].gfx = buf->ReadByte();
 
              if (att[k].gfx == 0xFE) {
                /* Use a new tile from this GRF */
                int local_tile_id = buf->ReadWord();
 
                /* Read the ID from the _airporttile_mngr. */
                uint16 tempid = _airporttile_mngr.GetID(local_tile_id, _cur.grffile->grfid);
 
                if (tempid == INVALID_AIRPORTTILE) {
                  grfmsg(2, "AirportChangeInfo: Attempt to use airport tile %u with airport id %u, not yet defined. Ignoring.", local_tile_id, airport + i);
                } else {
                  /* Declared as been valid, can be used */
                  att[k].gfx = tempid;
                }
              } else if (att[k].gfx == 0xFF) {
                att[k].ti.x = (int8)GB(att[k].ti.x, 0, 8);
                att[k].ti.y = (int8)GB(att[k].ti.y, 0, 8);
              }
 
              if (as->rotation[j] == DIR_E || as->rotation[j] == DIR_W) {
                as->size_x = std::max<byte>(as->size_x, att[k].ti.y + 1);
                as->size_y = std::max<byte>(as->size_y, att[k].ti.x + 1);
              } else {
                as->size_x = std::max<byte>(as->size_x, att[k].ti.x + 1);
                as->size_y = std::max<byte>(as->size_y, att[k].ti.y + 1);
              }
            }
            tile_table[j] = CallocT<AirportTileTable>(size);
            memcpy(tile_table[j], copy_from, sizeof(*copy_from) * size);
          }
          /* Free old layouts in the airport spec */
          for (int j = 0; j < old_num_table; j++) {
            /* remove the individual layouts */
            free(as->table[j]);
          }
          free(as->table);
          /* Install final layout construction in the airport spec */
          as->table = tile_table;
          free(att);
        } catch (...) {
          for (int i = 0; i < as->num_table; i++) {
            free(tile_table[i]);
          }
          free(tile_table);
          free(att);
          throw;
        }
        break;
      }
 
      case 0x0C:
        as->min_year = buf->ReadWord();
        as->max_year = buf->ReadWord();
        if (as->max_year == 0xFFFF) as->max_year = MAX_YEAR;
        break;
 
      case 0x0D:
        as->ttd_airport_type = (TTDPAirportType)buf->ReadByte();
        break;
 
      case 0x0E:
        as->catchment = Clamp(buf->ReadByte(), 1, MAX_CATCHMENT);
        break;
 
      case 0x0F:
        as->noise_level = buf->ReadByte();
        break;
 
      case 0x10:
        AddStringForMapping(buf->ReadWord(), &as->name);
        break;
 
      case 0x11: // Maintenance cost factor
        as->maintenance_cost = buf->ReadWord();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult IgnoreObjectProperty(uint prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  switch (prop) {
    case 0x0B:
    case 0x0C:
    case 0x0D:
    case 0x12:
    case 0x14:
    case 0x16:
    case 0x17:
      buf->ReadByte();
      break;
 
    case 0x09:
    case 0x0A:
    case 0x10:
    case 0x11:
    case 0x13:
    case 0x15:
      buf->ReadWord();
      break;
 
    case 0x08:
    case 0x0E:
    case 0x0F:
      buf->ReadDWord();
      break;
 
    default:
      ret = CIR_UNKNOWN;
      break;
  }
 
  return ret;
}
 
static ChangeInfoResult ObjectChangeInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (id + numinfo > NUM_OBJECTS_PER_GRF) {
    grfmsg(1, "ObjectChangeInfo: Too many objects loaded (%u), max (%u). Ignoring.", id + numinfo, NUM_OBJECTS_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate object specs if they haven't been allocated already. */
  if (_cur.grffile->objectspec == nullptr) {
    _cur.grffile->objectspec = CallocT<ObjectSpec*>(NUM_OBJECTS_PER_GRF);
  }
 
  for (int i = 0; i < numinfo; i++) {
    ObjectSpec *spec = _cur.grffile->objectspec[id + i];
 
    if (prop != 0x08 && spec == nullptr) {
      /* If the object property 08 is not yet set, ignore this property */
      ChangeInfoResult cir = IgnoreObjectProperty(prop, buf);
      if (cir > ret) ret = cir;
      continue;
    }
 
    switch (prop) {
      case 0x08: { // Class ID
        ObjectSpec **ospec = &_cur.grffile->objectspec[id + i];
 
        /* Allocate space for this object. */
        if (*ospec == nullptr) {
          *ospec = CallocT<ObjectSpec>(1);
          (*ospec)->views = 1; // Default for NewGRFs that don't set it.
          (*ospec)->size = OBJECT_SIZE_1X1; // Default for NewGRFs that manage to not set it (1x1)
        }
 
        /* Swap classid because we read it in BE. */
        uint32 classid = buf->ReadDWord();
        (*ospec)->cls_id = ObjectClass::Allocate(BSWAP32(classid));
        (*ospec)->enabled = true;
        break;
      }
 
      case 0x09: { // Class name
        ObjectClass *objclass = ObjectClass::Get(spec->cls_id);
        AddStringForMapping(buf->ReadWord(), &objclass->name);
        break;
      }
 
      case 0x0A: // Object name
        AddStringForMapping(buf->ReadWord(), &spec->name);
        break;
 
      case 0x0B: // Climate mask
        spec->climate = buf->ReadByte();
        break;
 
      case 0x0C: // Size
        spec->size = buf->ReadByte();
        if (GB(spec->size, 0, 4) == 0 || GB(spec->size, 4, 4) == 0) {
          grfmsg(0, "ObjectChangeInfo: Invalid object size requested (0x%x) for object id %u. Ignoring.", spec->size, id + i);
          spec->size = OBJECT_SIZE_1X1;
        }
        break;
 
      case 0x0D: // Build cost multipler
        spec->build_cost_multiplier = buf->ReadByte();
        spec->clear_cost_multiplier = spec->build_cost_multiplier;
        break;
 
      case 0x0E: // Introduction date
        spec->introduction_date = buf->ReadDWord();
        break;
 
      case 0x0F: // End of life
        spec->end_of_life_date = buf->ReadDWord();
        break;
 
      case 0x10: // Flags
        spec->flags = (ObjectFlags)buf->ReadWord();
        _loaded_newgrf_features.has_2CC |= (spec->flags & OBJECT_FLAG_2CC_COLOUR) != 0;
        break;
 
      case 0x11: // Animation info
        spec->animation.frames = buf->ReadByte();
        spec->animation.status = buf->ReadByte();
        break;
 
      case 0x12: // Animation speed
        spec->animation.speed = buf->ReadByte();
        break;
 
      case 0x13: // Animation triggers
        spec->animation.triggers = buf->ReadWord();
        break;
 
      case 0x14: // Removal cost multiplier
        spec->clear_cost_multiplier = buf->ReadByte();
        break;
 
      case 0x15: // Callback mask
        spec->callback_mask = buf->ReadWord();
        break;
 
      case 0x16: // Building height
        spec->height = buf->ReadByte();
        break;
 
      case 0x17: // Views
        spec->views = buf->ReadByte();
        if (spec->views != 1 && spec->views != 2 && spec->views != 4) {
          grfmsg(2, "ObjectChangeInfo: Invalid number of views (%u) for object id %u. Ignoring.", spec->views, id + i);
          spec->views = 1;
        }
        break;
 
      case 0x18: // Amount placed on 256^2 map on map creation
        spec->generate_amount = buf->ReadByte();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult RailTypeChangeInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  extern RailtypeInfo _railtypes[RAILTYPE_END];
 
  if (id + numinfo > RAILTYPE_END) {
    grfmsg(1, "RailTypeChangeInfo: Rail type %u is invalid, max %u, ignoring", id + numinfo, RAILTYPE_END);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    RailType rt = _cur.grffile->railtype_map[id + i];
    if (rt == INVALID_RAILTYPE) return CIR_INVALID_ID;
 
    RailtypeInfo *rti = &_railtypes[rt];
 
    switch (prop) {
      case 0x08: // Label of rail type
        /* Skipped here as this is loaded during reservation stage. */
        buf->ReadDWord();
        break;
 
      case 0x09: { // Toolbar caption of railtype (sets name as well for backwards compatibility for grf ver < 8)
        uint16 str = buf->ReadWord();
        AddStringForMapping(str, &rti->strings.toolbar_caption);
        if (_cur.grffile->grf_version < 8) {
          AddStringForMapping(str, &rti->strings.name);
        }
        break;
      }
 
      case 0x0A: // Menu text of railtype
        AddStringForMapping(buf->ReadWord(), &rti->strings.menu_text);
        break;
 
      case 0x0B: // Build window caption
        AddStringForMapping(buf->ReadWord(), &rti->strings.build_caption);
        break;
 
      case 0x0C: // Autoreplace text
        AddStringForMapping(buf->ReadWord(), &rti->strings.replace_text);
        break;
 
      case 0x0D: // New locomotive text
        AddStringForMapping(buf->ReadWord(), &rti->strings.new_loco);
        break;
 
      case 0x0E: // Compatible railtype list
      case 0x0F: // Powered railtype list
      case 0x18: // Railtype list required for date introduction
      case 0x19: // Introduced railtype list
      {
        /* Rail type compatibility bits are added to the existing bits
         * to allow multiple GRFs to modify compatibility with the
         * default rail types. */
        int n = buf->ReadByte();
        for (int j = 0; j != n; j++) {
          RailTypeLabel label = buf->ReadDWord();
          RailType rt = GetRailTypeByLabel(BSWAP32(label), false);
          if (rt != INVALID_RAILTYPE) {
            switch (prop) {
              case 0x0F: SetBit(rti->powered_railtypes, rt);               FALLTHROUGH; // Powered implies compatible.
              case 0x0E: SetBit(rti->compatible_railtypes, rt);            break;
              case 0x18: SetBit(rti->introduction_required_railtypes, rt); break;
              case 0x19: SetBit(rti->introduces_railtypes, rt);            break;
            }
          }
        }
        break;
      }
 
      case 0x10: // Rail Type flags
        rti->flags = (RailTypeFlags)buf->ReadByte();
        break;
 
      case 0x11: // Curve speed advantage
        rti->curve_speed = buf->ReadByte();
        break;
 
      case 0x12: // Station graphic
        rti->fallback_railtype = Clamp(buf->ReadByte(), 0, 2);
        break;
 
      case 0x13: // Construction cost factor
        rti->cost_multiplier = buf->ReadWord();
        break;
 
      case 0x14: // Speed limit
        rti->max_speed = buf->ReadWord();
        break;
 
      case 0x15: // Acceleration model
        rti->acceleration_type = Clamp(buf->ReadByte(), 0, 2);
        break;
 
      case 0x16: // Map colour
        rti->map_colour = buf->ReadByte();
        break;
 
      case 0x17: // Introduction date
        rti->introduction_date = buf->ReadDWord();
        break;
 
      case 0x1A: // Sort order
        rti->sorting_order = buf->ReadByte();
        break;
 
      case 0x1B: // Name of railtype (overridden by prop 09 for grf ver < 8)
        AddStringForMapping(buf->ReadWord(), &rti->strings.name);
        break;
 
      case 0x1C: // Maintenance cost factor
        rti->maintenance_multiplier = buf->ReadWord();
        break;
 
      case 0x1D: // Alternate rail type label list
        /* Skipped here as this is loaded during reservation stage. */
        for (int j = buf->ReadByte(); j != 0; j--) buf->ReadDWord();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult RailTypeReserveInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  extern RailtypeInfo _railtypes[RAILTYPE_END];
 
  if (id + numinfo > RAILTYPE_END) {
    grfmsg(1, "RailTypeReserveInfo: Rail type %u is invalid, max %u, ignoring", id + numinfo, RAILTYPE_END);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    switch (prop) {
      case 0x08: // Label of rail type
      {
        RailTypeLabel rtl = buf->ReadDWord();
        rtl = BSWAP32(rtl);
 
        RailType rt = GetRailTypeByLabel(rtl, false);
        if (rt == INVALID_RAILTYPE) {
          /* Set up new rail type */
          rt = AllocateRailType(rtl);
        }
 
        _cur.grffile->railtype_map[id + i] = rt;
        break;
      }
 
      case 0x09: // Toolbar caption of railtype
      case 0x0A: // Menu text
      case 0x0B: // Build window caption
      case 0x0C: // Autoreplace text
      case 0x0D: // New loco
      case 0x13: // Construction cost
      case 0x14: // Speed limit
      case 0x1B: // Name of railtype
      case 0x1C: // Maintenance cost factor
        buf->ReadWord();
        break;
 
      case 0x1D: // Alternate rail type label list
        if (_cur.grffile->railtype_map[id + i] != INVALID_RAILTYPE) {
          int n = buf->ReadByte();
          for (int j = 0; j != n; j++) {
            _railtypes[_cur.grffile->railtype_map[id + i]].alternate_labels.push_back(BSWAP32(buf->ReadDWord()));
          }
          break;
        }
        grfmsg(1, "RailTypeReserveInfo: Ignoring property 1D for rail type %u because no label was set", id + i);
        FALLTHROUGH;
 
      case 0x0E: // Compatible railtype list
      case 0x0F: // Powered railtype list
      case 0x18: // Railtype list required for date introduction
      case 0x19: // Introduced railtype list
        for (int j = buf->ReadByte(); j != 0; j--) buf->ReadDWord();
        break;
 
      case 0x10: // Rail Type flags
      case 0x11: // Curve speed advantage
      case 0x12: // Station graphic
      case 0x15: // Acceleration model
      case 0x16: // Map colour
      case 0x1A: // Sort order
        buf->ReadByte();
        break;
 
      case 0x17: // Introduction date
        buf->ReadDWord();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult RoadTypeChangeInfo(uint id, int numinfo, int prop, ByteReader *buf, RoadTramType rtt)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  extern RoadTypeInfo _roadtypes[ROADTYPE_END];
  RoadType *type_map = (rtt == RTT_TRAM) ? _cur.grffile->tramtype_map : _cur.grffile->roadtype_map;
 
  if (id + numinfo > ROADTYPE_END) {
    grfmsg(1, "RoadTypeChangeInfo: Road type %u is invalid, max %u, ignoring", id + numinfo, ROADTYPE_END);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    RoadType rt = type_map[id + i];
    if (rt == INVALID_ROADTYPE) return CIR_INVALID_ID;
 
    RoadTypeInfo *rti = &_roadtypes[rt];
 
    switch (prop) {
      case 0x08: // Label of road type
        /* Skipped here as this is loaded during reservation stage. */
        buf->ReadDWord();
        break;
 
      case 0x09: { // Toolbar caption of roadtype (sets name as well for backwards compatibility for grf ver < 8)
        uint16 str = buf->ReadWord();
        AddStringForMapping(str, &rti->strings.toolbar_caption);
        break;
      }
 
      case 0x0A: // Menu text of roadtype
        AddStringForMapping(buf->ReadWord(), &rti->strings.menu_text);
        break;
 
      case 0x0B: // Build window caption
        AddStringForMapping(buf->ReadWord(), &rti->strings.build_caption);
        break;
 
      case 0x0C: // Autoreplace text
        AddStringForMapping(buf->ReadWord(), &rti->strings.replace_text);
        break;
 
      case 0x0D: // New engine text
        AddStringForMapping(buf->ReadWord(), &rti->strings.new_engine);
        break;
 
      case 0x0F: // Powered roadtype list
      case 0x18: // Roadtype list required for date introduction
      case 0x19: { // Introduced roadtype list
        /* Road type compatibility bits are added to the existing bits
         * to allow multiple GRFs to modify compatibility with the
         * default road types. */
        int n = buf->ReadByte();
        for (int j = 0; j != n; j++) {
          RoadTypeLabel label = buf->ReadDWord();
          RoadType rt = GetRoadTypeByLabel(BSWAP32(label), false);
          if (rt != INVALID_ROADTYPE) {
            switch (prop) {
              case 0x0F: SetBit(rti->powered_roadtypes, rt);               break;
              case 0x18: SetBit(rti->introduction_required_roadtypes, rt); break;
              case 0x19: SetBit(rti->introduces_roadtypes, rt);            break;
            }
          }
        }
        break;
      }
 
      case 0x10: // Road Type flags
        rti->flags = (RoadTypeFlags)buf->ReadByte();
        break;
 
      case 0x13: // Construction cost factor
        rti->cost_multiplier = buf->ReadWord();
        break;
 
      case 0x14: // Speed limit
        rti->max_speed = buf->ReadWord();
        break;
 
      case 0x16: // Map colour
        rti->map_colour = buf->ReadByte();
        break;
 
      case 0x17: // Introduction date
        rti->introduction_date = buf->ReadDWord();
        break;
 
      case 0x1A: // Sort order
        rti->sorting_order = buf->ReadByte();
        break;
 
      case 0x1B: // Name of roadtype
        AddStringForMapping(buf->ReadWord(), &rti->strings.name);
        break;
 
      case 0x1C: // Maintenance cost factor
        rti->maintenance_multiplier = buf->ReadWord();
        break;
 
      case 0x1D: // Alternate road type label list
        /* Skipped here as this is loaded during reservation stage. */
        for (int j = buf->ReadByte(); j != 0; j--) buf->ReadDWord();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult RoadTypeChangeInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  return RoadTypeChangeInfo(id, numinfo, prop, buf, RTT_ROAD);
}
 
static ChangeInfoResult TramTypeChangeInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  return RoadTypeChangeInfo(id, numinfo, prop, buf, RTT_TRAM);
}
 
 
static ChangeInfoResult RoadTypeReserveInfo(uint id, int numinfo, int prop, ByteReader *buf, RoadTramType rtt)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  extern RoadTypeInfo _roadtypes[ROADTYPE_END];
  RoadType *type_map = (rtt == RTT_TRAM) ? _cur.grffile->tramtype_map : _cur.grffile->roadtype_map;
 
  if (id + numinfo > ROADTYPE_END) {
    grfmsg(1, "RoadTypeReserveInfo: Road type %u is invalid, max %u, ignoring", id + numinfo, ROADTYPE_END);
    return CIR_INVALID_ID;
  }
 
  for (int i = 0; i < numinfo; i++) {
    switch (prop) {
      case 0x08: { // Label of road type
        RoadTypeLabel rtl = buf->ReadDWord();
        rtl = BSWAP32(rtl);
 
        RoadType rt = GetRoadTypeByLabel(rtl, false);
        if (rt == INVALID_ROADTYPE) {
          /* Set up new road type */
          rt = AllocateRoadType(rtl, rtt);
        } else if (GetRoadTramType(rt) != rtt) {
          grfmsg(1, "RoadTypeReserveInfo: Road type %u is invalid type (road/tram), ignoring", id + numinfo);
          return CIR_INVALID_ID;
        }
 
        type_map[id + i] = rt;
        break;
      }
      case 0x09: // Toolbar caption of roadtype
      case 0x0A: // Menu text
      case 0x0B: // Build window caption
      case 0x0C: // Autoreplace text
      case 0x0D: // New loco
      case 0x13: // Construction cost
      case 0x14: // Speed limit
      case 0x1B: // Name of roadtype
      case 0x1C: // Maintenance cost factor
        buf->ReadWord();
        break;
 
      case 0x1D: // Alternate road type label list
        if (type_map[id + i] != INVALID_ROADTYPE) {
          int n = buf->ReadByte();
          for (int j = 0; j != n; j++) {
            _roadtypes[type_map[id + i]].alternate_labels.push_back(BSWAP32(buf->ReadDWord()));
          }
          break;
        }
        grfmsg(1, "RoadTypeReserveInfo: Ignoring property 1D for road type %u because no label was set", id + i);
        /* FALL THROUGH */
 
      case 0x0F: // Powered roadtype list
      case 0x18: // Roadtype list required for date introduction
      case 0x19: // Introduced roadtype list
        for (int j = buf->ReadByte(); j != 0; j--) buf->ReadDWord();
        break;
 
      case 0x10: // Road Type flags
      case 0x16: // Map colour
      case 0x1A: // Sort order
        buf->ReadByte();
        break;
 
      case 0x17: // Introduction date
        buf->ReadDWord();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static ChangeInfoResult RoadTypeReserveInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  return RoadTypeReserveInfo(id, numinfo, prop, buf, RTT_ROAD);
}
 
static ChangeInfoResult TramTypeReserveInfo(uint id, int numinfo, int prop, ByteReader *buf)
{
  return RoadTypeReserveInfo(id, numinfo, prop, buf, RTT_TRAM);
}
 
static ChangeInfoResult AirportTilesChangeInfo(uint airtid, int numinfo, int prop, ByteReader *buf)
{
  ChangeInfoResult ret = CIR_SUCCESS;
 
  if (airtid + numinfo > NUM_AIRPORTTILES_PER_GRF) {
    grfmsg(1, "AirportTileChangeInfo: Too many airport tiles loaded (%u), max (%u). Ignoring.", airtid + numinfo, NUM_AIRPORTTILES_PER_GRF);
    return CIR_INVALID_ID;
  }
 
  /* Allocate airport tile specs if they haven't been allocated already. */
  if (_cur.grffile->airtspec == nullptr) {
    _cur.grffile->airtspec = CallocT<AirportTileSpec*>(NUM_AIRPORTTILES_PER_GRF);
  }
 
  for (int i = 0; i < numinfo; i++) {
    AirportTileSpec *tsp = _cur.grffile->airtspec[airtid + i];
 
    if (prop != 0x08 && tsp == nullptr) {
      grfmsg(2, "AirportTileChangeInfo: Attempt to modify undefined airport tile %u. Ignoring.", airtid + i);
      return CIR_INVALID_ID;
    }
 
    switch (prop) {
      case 0x08: { // Substitute airport tile type
        AirportTileSpec **tilespec = &_cur.grffile->airtspec[airtid + i];
        byte subs_id = buf->ReadByte();
 
        if (subs_id >= NEW_AIRPORTTILE_OFFSET) {
          /* The substitute id must be one of the original airport tiles. */
          grfmsg(2, "AirportTileChangeInfo: Attempt to use new airport tile %u as substitute airport tile for %u. Ignoring.", subs_id, airtid + i);
          continue;
        }
 
        /* Allocate space for this airport tile. */
        if (*tilespec == nullptr) {
          *tilespec = CallocT<AirportTileSpec>(1);
          tsp = *tilespec;
 
          memcpy(tsp, AirportTileSpec::Get(subs_id), sizeof(AirportTileSpec));
          tsp->enabled = true;
 
          tsp->animation.status = ANIM_STATUS_NO_ANIMATION;
 
          tsp->grf_prop.local_id = airtid + i;
          tsp->grf_prop.subst_id = subs_id;
          tsp->grf_prop.grffile = _cur.grffile;
          _airporttile_mngr.AddEntityID(airtid + i, _cur.grffile->grfid, subs_id); // pre-reserve the tile slot
        }
        break;
      }
 
      case 0x09: { // Airport tile override
        byte override = buf->ReadByte();
 
        /* The airport tile being overridden must be an original airport tile. */
        if (override >= NEW_AIRPORTTILE_OFFSET) {
          grfmsg(2, "AirportTileChangeInfo: Attempt to override new airport tile %u with airport tile id %u. Ignoring.", override, airtid + i);
          continue;
        }
 
        _airporttile_mngr.Add(airtid + i, _cur.grffile->grfid, override);
        break;
      }
 
      case 0x0E: // Callback mask
        tsp->callback_mask = buf->ReadByte();
        break;
 
      case 0x0F: // Animation information
        tsp->animation.frames = buf->ReadByte();
        tsp->animation.status = buf->ReadByte();
        break;
 
      case 0x10: // Animation speed
        tsp->animation.speed = buf->ReadByte();
        break;
 
      case 0x11: // Animation triggers
        tsp->animation.triggers = buf->ReadByte();
        break;
 
      default:
        ret = CIR_UNKNOWN;
        break;
    }
  }
 
  return ret;
}
 
static bool HandleChangeInfoResult(const char *caller, ChangeInfoResult cir, uint8 feature, uint8 property)
{
  switch (cir) {
    default: NOT_REACHED();
 
    case CIR_DISABLED:
      /* Error has already been printed; just stop parsing */
      return true;
 
    case CIR_SUCCESS:
      return false;
 
    case CIR_UNHANDLED:
      grfmsg(1, "%s: Ignoring property 0x%02X of feature 0x%02X (not implemented)", caller, property, feature);
      return false;
 
    case CIR_UNKNOWN:
      grfmsg(0, "%s: Unknown property 0x%02X of feature 0x%02X, disabling", caller, property, feature);
      FALLTHROUGH;
 
    case CIR_INVALID_ID: {
      /* No debug message for an invalid ID, as it has already been output */
      GRFError *error = DisableGrf(cir == CIR_INVALID_ID ? STR_NEWGRF_ERROR_INVALID_ID : STR_NEWGRF_ERROR_UNKNOWN_PROPERTY);
      if (cir != CIR_INVALID_ID) error->param_value[1] = property;
      return true;
    }
  }
}
 
/* Action 0x00 */
static void FeatureChangeInfo(ByteReader *buf)
{
  /* <00> <feature> <num-props> <num-info> <id> (<property <new-info>)...
   *
   * B feature
   * B num-props     how many properties to change per vehicle/station
   * B num-info      how many vehicles/stations to change
   * E id            ID of first vehicle/station to change, if num-info is
   *                 greater than one, this one and the following
   *                 vehicles/stations will be changed
   * B property      what property to change, depends on the feature
   * V new-info      new bytes of info (variable size; depends on properties) */
 
  static const VCI_Handler handler[] = {
    /* GSF_TRAINS */        RailVehicleChangeInfo,
    /* GSF_ROADVEHICLES */  RoadVehicleChangeInfo,
    /* GSF_SHIPS */         ShipVehicleChangeInfo,
    /* GSF_AIRCRAFT */      AircraftVehicleChangeInfo,
    /* GSF_STATIONS */      StationChangeInfo,
    /* GSF_CANALS */        CanalChangeInfo,
    /* GSF_BRIDGES */       BridgeChangeInfo,
    /* GSF_HOUSES */        TownHouseChangeInfo,
    /* GSF_GLOBALVAR */     GlobalVarChangeInfo,
    /* GSF_INDUSTRYTILES */ IndustrytilesChangeInfo,
    /* GSF_INDUSTRIES */    IndustriesChangeInfo,
    /* GSF_CARGOES */       nullptr, // Cargo is handled during reservation
    /* GSF_SOUNDFX */       SoundEffectChangeInfo,
    /* GSF_AIRPORTS */      AirportChangeInfo,
    /* GSF_SIGNALS */       nullptr,
    /* GSF_OBJECTS */       ObjectChangeInfo,
    /* GSF_RAILTYPES */     RailTypeChangeInfo,
    /* GSF_AIRPORTTILES */  AirportTilesChangeInfo,
    /* GSF_ROADTYPES */     RoadTypeChangeInfo,
    /* GSF_TRAMTYPES */     TramTypeChangeInfo,
  };
  static_assert(GSF_END == lengthof(handler));
 
  uint8 feature  = buf->ReadByte();
  uint8 numprops = buf->ReadByte();
  uint numinfo  = buf->ReadByte();
  uint engine   = buf->ReadExtendedByte();
 
  if (feature >= GSF_END) {
    grfmsg(1, "FeatureChangeInfo: Unsupported feature 0x%02X, skipping", feature);
    return;
  }
 
  grfmsg(6, "FeatureChangeInfo: Feature 0x%02X, %d properties, to apply to %d+%d",
                 feature, numprops, engine, numinfo);
 
  if (handler[feature] == nullptr) {
    if (feature != GSF_CARGOES) grfmsg(1, "FeatureChangeInfo: Unsupported feature 0x%02X, skipping", feature);
    return;
  }
 
  /* Mark the feature as used by the grf */
  SetBit(_cur.grffile->grf_features, feature);
 
  while (numprops-- && buf->HasData()) {
    uint8 prop = buf->ReadByte();
 
    ChangeInfoResult cir = handler[feature](engine, numinfo, prop, buf);
    if (HandleChangeInfoResult("FeatureChangeInfo", cir, feature, prop)) return;
  }
}
 
/* Action 0x00 (GLS_SAFETYSCAN) */
static void SafeChangeInfo(ByteReader *buf)
{
  uint8 feature  = buf->ReadByte();
  uint8 numprops = buf->ReadByte();
  uint numinfo = buf->ReadByte();
  buf->ReadExtendedByte(); // id
 
  if (feature == GSF_BRIDGES && numprops == 1) {
    uint8 prop = buf->ReadByte();
    /* Bridge property 0x0D is redefinition of sprite layout tables, which
     * is considered safe. */
    if (prop == 0x0D) return;
  } else if (feature == GSF_GLOBALVAR && numprops == 1) {
    uint8 prop = buf->ReadByte();
    /* Engine ID Mappings are safe, if the source is static */
    if (prop == 0x11) {
      bool is_safe = true;
      for (uint i = 0; i < numinfo; i++) {
        uint32 s = buf->ReadDWord();
        buf->ReadDWord(); // dest
        const GRFConfig *grfconfig = GetGRFConfig(s);
        if (grfconfig != nullptr && !HasBit(grfconfig->flags, GCF_STATIC)) {
          is_safe = false;
          break;
        }
      }
      if (is_safe) return;
    }
  }
 
  SetBit(_cur.grfconfig->flags, GCF_UNSAFE);
 
  /* Skip remainder of GRF */
  _cur.skip_sprites = -1;
}
 
/* Action 0x00 (GLS_RESERVE) */
static void ReserveChangeInfo(ByteReader *buf)
{
  uint8 feature  = buf->ReadByte();
 
  if (feature != GSF_CARGOES && feature != GSF_GLOBALVAR && feature != GSF_RAILTYPES && feature != GSF_ROADTYPES && feature != GSF_TRAMTYPES) return;
 
  uint8 numprops = buf->ReadByte();
  uint8 numinfo  = buf->ReadByte();
  uint8 index    = buf->ReadExtendedByte();
 
  while (numprops-- && buf->HasData()) {
    uint8 prop = buf->ReadByte();
    ChangeInfoResult cir = CIR_SUCCESS;
 
    switch (feature) {
      default: NOT_REACHED();
      case GSF_CARGOES:
        cir = CargoChangeInfo(index, numinfo, prop, buf);
        break;
 
      case GSF_GLOBALVAR:
        cir = GlobalVarReserveInfo(index, numinfo, prop, buf);
        break;
 
      case GSF_RAILTYPES:
        cir = RailTypeReserveInfo(index, numinfo, prop, buf);
        break;
 
      case GSF_ROADTYPES:
        cir = RoadTypeReserveInfo(index, numinfo, prop, buf);
        break;
 
      case GSF_TRAMTYPES:
        cir = TramTypeReserveInfo(index, numinfo, prop, buf);
        break;
    }
 
    if (HandleChangeInfoResult("ReserveChangeInfo", cir, feature, prop)) return;
  }
}
 
/* Action 0x01 */
static void NewSpriteSet(ByteReader *buf)
{
  /* Basic format:    <01> <feature> <num-sets> <num-ent>
   * Extended format: <01> <feature> 00 <first-set> <num-sets> <num-ent>
   *
   * B feature       feature to define sprites for
   *                 0, 1, 2, 3: veh-type, 4: train stations
   * E first-set     first sprite set to define
   * B num-sets      number of sprite sets (extended byte in extended format)
   * E num-ent       how many entries per sprite set
   *                 For vehicles, this is the number of different
   *                         vehicle directions in each sprite set
   *                         Set num-dirs=8, unless your sprites are symmetric.
   *                         In that case, use num-dirs=4.
   */
 
  uint8  feature   = buf->ReadByte();
  uint16 num_sets  = buf->ReadByte();
  uint16 first_set = 0;
 
  if (num_sets == 0 && buf->HasData(3)) {
    /* Extended Action1 format.
     * Some GRFs define zero sets of zero sprites, though there is actually no use in that. Ignore them. */
    first_set = buf->ReadExtendedByte();
    num_sets = buf->ReadExtendedByte();
  }
  uint16 num_ents = buf->ReadExtendedByte();
 
  if (feature >= GSF_END) {
    _cur.skip_sprites = num_sets * num_ents;
    grfmsg(1, "NewSpriteSet: Unsupported feature 0x%02X, skipping %d sprites", feature, _cur.skip_sprites);
    return;
  }
 
  _cur.AddSpriteSets(feature, _cur.spriteid, first_set, num_sets, num_ents);
 
  grfmsg(7, "New sprite set at %d of feature 0x%02X, consisting of %d sets with %d views each (total %d)",
    _cur.spriteid, feature, num_sets, num_ents, num_sets * num_ents
  );
 
  for (int i = 0; i < num_sets * num_ents; i++) {
    _cur.nfo_line++;
    LoadNextSprite(_cur.spriteid++, *_cur.file, _cur.nfo_line);
  }
}
 
/* Action 0x01 (SKIP) */
static void SkipAct1(ByteReader *buf)
{
  buf->ReadByte();
  uint16 num_sets  = buf->ReadByte();
 
  if (num_sets == 0 && buf->HasData(3)) {
    /* Extended Action1 format.
     * Some GRFs define zero sets of zero sprites, though there is actually no use in that. Ignore them. */
    buf->ReadExtendedByte(); // first_set
    num_sets = buf->ReadExtendedByte();
  }
  uint16 num_ents = buf->ReadExtendedByte();
 
  _cur.skip_sprites = num_sets * num_ents;
 
  grfmsg(3, "SkipAct1: Skipping %d sprites", _cur.skip_sprites);
}
 
/* Helper function to either create a callback or link to a previously
 * defined spritegroup. */
static const SpriteGroup *GetGroupFromGroupID(byte setid, byte type, uint16 groupid)
{
  if (HasBit(groupid, 15)) {
    assert(CallbackResultSpriteGroup::CanAllocateItem());
    return new CallbackResultSpriteGroup(groupid, _cur.grffile->grf_version >= 8);
  }
 
  if (groupid > MAX_SPRITEGROUP || _cur.spritegroups[groupid] == nullptr) {
    grfmsg(1, "GetGroupFromGroupID(0x%02X:0x%02X): Groupid 0x%04X does not exist, leaving empty", setid, type, groupid);
    return nullptr;
  }
 
  return _cur.spritegroups[groupid];
}
 
static const SpriteGroup *CreateGroupFromGroupID(byte feature, byte setid, byte type, uint16 spriteid)
{
  if (HasBit(spriteid, 15)) {
    assert(CallbackResultSpriteGroup::CanAllocateItem());
    return new CallbackResultSpriteGroup(spriteid, _cur.grffile->grf_version >= 8);
  }
 
  if (!_cur.IsValidSpriteSet(feature, spriteid)) {
    grfmsg(1, "CreateGroupFromGroupID(0x%02X:0x%02X): Sprite set %u invalid", setid, type, spriteid);
    return nullptr;
  }
 
  SpriteID spriteset_start = _cur.GetSprite(feature, spriteid);
  uint num_sprites = _cur.GetNumEnts(feature, spriteid);
 
  /* Ensure that the sprites are loeded */
  assert(spriteset_start + num_sprites <= _cur.spriteid);
 
  assert(ResultSpriteGroup::CanAllocateItem());
  return new ResultSpriteGroup(spriteset_start, num_sprites);
}
 
/* Action 0x02 */
static void NewSpriteGroup(ByteReader *buf)
{
  /* <02> <feature> <set-id> <type/num-entries> <feature-specific-data...>
   *
   * B feature       see action 1
   * B set-id        ID of this particular definition
   * B type/num-entries
   *                 if 80 or greater, this is a randomized or variational
   *                 list definition, see below
   *                 otherwise it specifies a number of entries, the exact
   *                 meaning depends on the feature
   * V feature-specific-data (huge mess, don't even look it up --pasky) */
  const SpriteGroup *act_group = nullptr;
 
  uint8 feature = buf->ReadByte();
  if (feature >= GSF_END) {
    grfmsg(1, "NewSpriteGroup: Unsupported feature 0x%02X, skipping", feature);
    return;
  }
 
  uint8 setid   = buf->ReadByte();
  uint8 type    = buf->ReadByte();
 
  /* Sprite Groups are created here but they are allocated from a pool, so
   * we do not need to delete anything if there is an exception from the
   * ByteReader. */
 
  switch (type) {
    /* Deterministic Sprite Group */
    case 0x81: // Self scope, byte
    case 0x82: // Parent scope, byte
    case 0x85: // Self scope, word
    case 0x86: // Parent scope, word
    case 0x89: // Self scope, dword
    case 0x8A: // Parent scope, dword
    {
      byte varadjust;
      byte varsize;
 
      assert(DeterministicSpriteGroup::CanAllocateItem());
      DeterministicSpriteGroup *group = new DeterministicSpriteGroup();
      group->nfo_line = _cur.nfo_line;
      act_group = group;
      group->var_scope = HasBit(type, 1) ? VSG_SCOPE_PARENT : VSG_SCOPE_SELF;
 
      switch (GB(type, 2, 2)) {
        default: NOT_REACHED();
        case 0: group->size = DSG_SIZE_BYTE;  varsize = 1; break;
        case 1: group->size = DSG_SIZE_WORD;  varsize = 2; break;
        case 2: group->size = DSG_SIZE_DWORD; varsize = 4; break;
      }
 
      /* Loop through the var adjusts. Unfortunately we don't know how many we have
       * from the outset, so we shall have to keep reallocing. */
      do {
        DeterministicSpriteGroupAdjust &adjust = group->adjusts.emplace_back();
 
        /* The first var adjust doesn't have an operation specified, so we set it to add. */
        adjust.operation = group->adjusts.size() == 1 ? DSGA_OP_ADD : (DeterministicSpriteGroupAdjustOperation)buf->ReadByte();
        adjust.variable  = buf->ReadByte();
        if (adjust.variable == 0x7E) {
          /* Link subroutine group */
          adjust.subroutine = GetGroupFromGroupID(setid, type, buf->ReadByte());
        } else {
          adjust.parameter = IsInsideMM(adjust.variable, 0x60, 0x80) ? buf->ReadByte() : 0;
        }
 
        varadjust = buf->ReadByte();
        adjust.shift_num = GB(varadjust, 0, 5);
        adjust.type      = (DeterministicSpriteGroupAdjustType)GB(varadjust, 6, 2);
        adjust.and_mask  = buf->ReadVarSize(varsize);
 
        if (adjust.type != DSGA_TYPE_NONE) {
          adjust.add_val    = buf->ReadVarSize(varsize);
          adjust.divmod_val = buf->ReadVarSize(varsize);
        } else {
          adjust.add_val    = 0;
          adjust.divmod_val = 0;
        }
 
        /* Continue reading var adjusts while bit 5 is set. */
      } while (HasBit(varadjust, 5));
 
      std::vector<DeterministicSpriteGroupRange> ranges;
      ranges.resize(buf->ReadByte());
      for (uint i = 0; i < ranges.size(); i++) {
        ranges[i].group = GetGroupFromGroupID(setid, type, buf->ReadWord());
        ranges[i].low   = buf->ReadVarSize(varsize);
        ranges[i].high  = buf->ReadVarSize(varsize);
      }
 
      group->default_group = GetGroupFromGroupID(setid, type, buf->ReadWord());
      group->error_group = ranges.size() > 0 ? ranges[0].group : group->default_group;
      /* nvar == 0 is a special case -- we turn our value into a callback result */
      group->calculated_result = ranges.size() == 0;
 
      /* Sort ranges ascending. When ranges overlap, this may required clamping or splitting them */
      std::vector<uint32> bounds;
      for (uint i = 0; i < ranges.size(); i++) {
        bounds.push_back(ranges[i].low);
        if (ranges[i].high != UINT32_MAX) bounds.push_back(ranges[i].high + 1);
      }
      std::sort(bounds.begin(), bounds.end());
      bounds.erase(std::unique(bounds.begin(), bounds.end()), bounds.end());
 
      std::vector<const SpriteGroup *> target;
      for (uint j = 0; j < bounds.size(); ++j) {
        uint32 v = bounds[j];
        const SpriteGroup *t = group->default_group;
        for (uint i = 0; i < ranges.size(); i++) {
          if (ranges[i].low <= v && v <= ranges[i].high) {
            t = ranges[i].group;
            break;
          }
        }
        target.push_back(t);
      }
      assert(target.size() == bounds.size());
 
      for (uint j = 0; j < bounds.size(); ) {
        if (target[j] != group->default_group) {
          DeterministicSpriteGroupRange &r = group->ranges.emplace_back();
          r.group = target[j];
          r.low = bounds[j];
          while (j < bounds.size() && target[j] == r.group) {
            j++;
          }
          r.high = j < bounds.size() ? bounds[j] - 1 : UINT32_MAX;
        } else {
          j++;
        }
      }
 
      break;
    }
 
    /* Randomized Sprite Group */
    case 0x80: // Self scope
    case 0x83: // Parent scope
    case 0x84: // Relative scope
    {
      assert(RandomizedSpriteGroup::CanAllocateItem());
      RandomizedSpriteGroup *group = new RandomizedSpriteGroup();
      group->nfo_line = _cur.nfo_line;
      act_group = group;
      group->var_scope = HasBit(type, 1) ? VSG_SCOPE_PARENT : VSG_SCOPE_SELF;
 
      if (HasBit(type, 2)) {
        if (feature <= GSF_AIRCRAFT) group->var_scope = VSG_SCOPE_RELATIVE;
        group->count = buf->ReadByte();
      }
 
      uint8 triggers = buf->ReadByte();
      group->triggers       = GB(triggers, 0, 7);
      group->cmp_mode       = HasBit(triggers, 7) ? RSG_CMP_ALL : RSG_CMP_ANY;
      group->lowest_randbit = buf->ReadByte();
 
      byte num_groups = buf->ReadByte();
      if (!HasExactlyOneBit(num_groups)) {
        grfmsg(1, "NewSpriteGroup: Random Action 2 nrand should be power of 2");
      }
 
      for (uint i = 0; i < num_groups; i++) {
        group->groups.push_back(GetGroupFromGroupID(setid, type, buf->ReadWord()));
      }
 
      break;
    }
 
    /* Neither a variable or randomized sprite group... must be a real group */
    default:
    {
      switch (feature) {
        case GSF_TRAINS:
        case GSF_ROADVEHICLES:
        case GSF_SHIPS:
        case GSF_AIRCRAFT:
        case GSF_STATIONS:
        case GSF_CANALS:
        case GSF_CARGOES:
        case GSF_AIRPORTS:
        case GSF_RAILTYPES:
        case GSF_ROADTYPES:
        case GSF_TRAMTYPES:
        {
          byte num_loaded  = type;
          byte num_loading = buf->ReadByte();
 
          if (!_cur.HasValidSpriteSets(feature)) {
            grfmsg(0, "NewSpriteGroup: No sprite set to work on! Skipping");
            return;
          }
 
          grfmsg(6, "NewSpriteGroup: New SpriteGroup 0x%02X, %u loaded, %u loading",
              setid, num_loaded, num_loading);
 
          if (num_loaded + num_loading == 0) {
            grfmsg(1, "NewSpriteGroup: no result, skipping invalid RealSpriteGroup");
            break;
          }
 
          if (num_loaded + num_loading == 1) {
            /* Avoid creating 'Real' sprite group if only one option. */
            uint16 spriteid = buf->ReadWord();
            act_group = CreateGroupFromGroupID(feature, setid, type, spriteid);
            grfmsg(8, "NewSpriteGroup: one result, skipping RealSpriteGroup = subset %u", spriteid);
            break;
          }
 
          std::vector<uint16> loaded;
          std::vector<uint16> loading;
 
          for (uint i = 0; i < num_loaded; i++) {
            loaded.push_back(buf->ReadWord());
            grfmsg(8, "NewSpriteGroup: + rg->loaded[%i]  = subset %u", i, loaded[i]);
          }
 
          for (uint i = 0; i < num_loading; i++) {
            loading.push_back(buf->ReadWord());
            grfmsg(8, "NewSpriteGroup: + rg->loading[%i] = subset %u", i, loading[i]);
          }
 
          if (std::adjacent_find(loaded.begin(),  loaded.end(),  std::not_equal_to<>()) == loaded.end() &&
            std::adjacent_find(loading.begin(), loading.end(), std::not_equal_to<>()) == loading.end() &&
            loaded[0] == loading[0])
          {
            /* Both lists only contain the same value, so don't create 'Real' sprite group */
            act_group = CreateGroupFromGroupID(feature, setid, type, loaded[0]);
            grfmsg(8, "NewSpriteGroup: same result, skipping RealSpriteGroup = subset %u", loaded[0]);
            break;
          }
 
          assert(RealSpriteGroup::CanAllocateItem());
          RealSpriteGroup *group = new RealSpriteGroup();
          group->nfo_line = _cur.nfo_line;
          act_group = group;
 
          for (uint16 spriteid : loaded) {
            const SpriteGroup *t = CreateGroupFromGroupID(feature, setid, type, spriteid);
            group->loaded.push_back(t);
          }
 
          for (uint16 spriteid : loading) {
            const SpriteGroup *t = CreateGroupFromGroupID(feature, setid, type, spriteid);
            group->loading.push_back(t);
          }
 
          break;
        }
 
        case GSF_HOUSES:
        case GSF_AIRPORTTILES:
        case GSF_OBJECTS:
        case GSF_INDUSTRYTILES: {
          byte num_building_sprites = std::max((uint8)1, type);
 
          assert(TileLayoutSpriteGroup::CanAllocateItem());
          TileLayoutSpriteGroup *group = new TileLayoutSpriteGroup();
          group->nfo_line = _cur.nfo_line;
          act_group = group;
 
          /* On error, bail out immediately. Temporary GRF data was already freed */
          if (ReadSpriteLayout(buf, num_building_sprites, true, feature, false, type == 0, &group->dts)) return;
          break;
        }
 
        case GSF_INDUSTRIES: {
          if (type > 2) {
            grfmsg(1, "NewSpriteGroup: Unsupported industry production version %d, skipping", type);
            break;
          }
 
          assert(IndustryProductionSpriteGroup::CanAllocateItem());
          IndustryProductionSpriteGroup *group = new IndustryProductionSpriteGroup();
          group->nfo_line = _cur.nfo_line;
          act_group = group;
          group->version = type;
          if (type == 0) {
            group->num_input = 3;
            for (uint i = 0; i < 3; i++) {
              group->subtract_input[i] = (int16)buf->ReadWord(); // signed
            }
            group->num_output = 2;
            for (uint i = 0; i < 2; i++) {
              group->add_output[i] = buf->ReadWord(); // unsigned
            }
            group->again = buf->ReadByte();
          } else if (type == 1) {
            group->num_input = 3;
            for (uint i = 0; i < 3; i++) {
              group->subtract_input[i] = buf->ReadByte();
            }
            group->num_output = 2;
            for (uint i = 0; i < 2; i++) {
              group->add_output[i] = buf->ReadByte();
            }
            group->again = buf->ReadByte();
          } else if (type == 2) {
            group->num_input = buf->ReadByte();
            if (group->num_input > lengthof(group->subtract_input)) {
              GRFError *error = DisableGrf(STR_NEWGRF_ERROR_INDPROD_CALLBACK);
              error->data = "too many inputs (max 16)";
              return;
            }
            for (uint i = 0; i < group->num_input; i++) {
              byte rawcargo = buf->ReadByte();
              CargoID cargo = GetCargoTranslation(rawcargo, _cur.grffile);
              if (cargo == CT_INVALID) {
                /* The mapped cargo is invalid. This is permitted at this point,
                 * as long as the result is not used. Mark it invalid so this
                 * can be tested later. */
                group->version = 0xFF;
              } else if (std::find(group->cargo_input, group->cargo_input + i, cargo) != group->cargo_input + i) {
                GRFError *error = DisableGrf(STR_NEWGRF_ERROR_INDPROD_CALLBACK);
                error->data = "duplicate input cargo";
                return;
              }
              group->cargo_input[i] = cargo;
              group->subtract_input[i] = buf->ReadByte();
            }
            group->num_output = buf->ReadByte();
            if (group->num_output > lengthof(group->add_output)) {
              GRFError *error = DisableGrf(STR_NEWGRF_ERROR_INDPROD_CALLBACK);
              error->data = "too many outputs (max 16)";
              return;
            }
            for (uint i = 0; i < group->num_output; i++) {
              byte rawcargo = buf->ReadByte();
              CargoID cargo = GetCargoTranslation(rawcargo, _cur.grffile);
              if (cargo == CT_INVALID) {
                /* Mark this result as invalid to use */
                group->version = 0xFF;
              } else if (std::find(group->cargo_output, group->cargo_output + i, cargo) != group->cargo_output + i) {
                GRFError *error = DisableGrf(STR_NEWGRF_ERROR_INDPROD_CALLBACK);
                error->data = "duplicate output cargo";
                return;
              }
              group->cargo_output[i] = cargo;
              group->add_output[i] = buf->ReadByte();
            }
            group->again = buf->ReadByte();
          } else {
            NOT_REACHED();
          }
          break;
        }
 
        /* Loading of Tile Layout and Production Callback groups would happen here */
        default: grfmsg(1, "NewSpriteGroup: Unsupported feature 0x%02X, skipping", feature);
      }
    }
  }
 
  _cur.spritegroups[setid] = act_group;
}
 
static CargoID TranslateCargo(uint8 feature, uint8 ctype)
{
  if (feature == GSF_OBJECTS) {
    switch (ctype) {
      case 0:    return 0;
      case 0xFF: return CT_PURCHASE_OBJECT;
      default:
        grfmsg(1, "TranslateCargo: Invalid cargo bitnum %d for objects, skipping.", ctype);
        return CT_INVALID;
    }
  }
  /* Special cargo types for purchase list and stations */
  if (feature == GSF_STATIONS && ctype == 0xFE) return CT_DEFAULT_NA;
  if (ctype == 0xFF) return CT_PURCHASE;
 
  if (_cur.grffile->cargo_list.size() == 0) {
    /* No cargo table, so use bitnum values */
    if (ctype >= 32) {
      grfmsg(1, "TranslateCargo: Cargo bitnum %d out of range (max 31), skipping.", ctype);
      return CT_INVALID;
    }
 
    for (const CargoSpec *cs : CargoSpec::Iterate()) {
      if (cs->bitnum == ctype) {
        grfmsg(6, "TranslateCargo: Cargo bitnum %d mapped to cargo type %d.", ctype, cs->Index());
        return cs->Index();
      }
    }
 
    grfmsg(5, "TranslateCargo: Cargo bitnum %d not available in this climate, skipping.", ctype);
    return CT_INVALID;
  }
 
  /* Check if the cargo type is out of bounds of the cargo translation table */
  if (ctype >= _cur.grffile->cargo_list.size()) {
    grfmsg(1, "TranslateCargo: Cargo type %d out of range (max %d), skipping.", ctype, (unsigned int)_cur.grffile->cargo_list.size() - 1);
    return CT_INVALID;
  }
 
  /* Look up the cargo label from the translation table */
  CargoLabel cl = _cur.grffile->cargo_list[ctype];
  if (cl == 0) {
    grfmsg(5, "TranslateCargo: Cargo type %d not available in this climate, skipping.", ctype);
    return CT_INVALID;
  }
 
  ctype = GetCargoIDByLabel(cl);
  if (ctype == CT_INVALID) {
    grfmsg(5, "TranslateCargo: Cargo '%c%c%c%c' unsupported, skipping.", GB(cl, 24, 8), GB(cl, 16, 8), GB(cl, 8, 8), GB(cl, 0, 8));
    return CT_INVALID;
  }
 
  grfmsg(6, "TranslateCargo: Cargo '%c%c%c%c' mapped to cargo type %d.", GB(cl, 24, 8), GB(cl, 16, 8), GB(cl, 8, 8), GB(cl, 0, 8), ctype);
  return ctype;
}
 
 
static bool IsValidGroupID(uint16 groupid, const char *function)
{
  if (groupid > MAX_SPRITEGROUP || _cur.spritegroups[groupid] == nullptr) {
    grfmsg(1, "%s: Spritegroup 0x%04X out of range or empty, skipping.", function, groupid);
    return false;
  }
 
  return true;
}
 
static void VehicleMapSpriteGroup(ByteReader *buf, byte feature, uint8 idcount)
{
  static EngineID *last_engines;
  static uint last_engines_count;
  bool wagover = false;
 
  /* Test for 'wagon override' flag */
  if (HasBit(idcount, 7)) {
    wagover = true;
    /* Strip off the flag */
    idcount = GB(idcount, 0, 7);
 
    if (last_engines_count == 0) {
      grfmsg(0, "VehicleMapSpriteGroup: WagonOverride: No engine to do override with");
      return;
    }
 
    grfmsg(6, "VehicleMapSpriteGroup: WagonOverride: %u engines, %u wagons",
        last_engines_count, idcount);
  } else {
    if (last_engines_count != idcount) {
      last_engines = ReallocT(last_engines, idcount);
      last_engines_count = idcount;
    }
  }
 
  EngineID *engines = AllocaM(EngineID, idcount);
  for (uint i = 0; i < idcount; i++) {
    Engine *e = GetNewEngine(_cur.grffile, (VehicleType)feature, buf->ReadExtendedByte());
    if (e == nullptr) {
      /* No engine could be allocated?!? Deal with it. Okay,
       * this might look bad. Also make sure this NewGRF
       * gets disabled, as a half loaded one is bad. */
      HandleChangeInfoResult("VehicleMapSpriteGroup", CIR_INVALID_ID, 0, 0);
      return;
    }
 
    engines[i] = e->index;
    if (!wagover) last_engines[i] = engines[i];
  }
 
  uint8 cidcount = buf->ReadByte();
  for (uint c = 0; c < cidcount; c++) {
    uint8 ctype = buf->ReadByte();
    uint16 groupid = buf->ReadWord();
    if (!IsValidGroupID(groupid, "VehicleMapSpriteGroup")) continue;
 
    grfmsg(8, "VehicleMapSpriteGroup: * [%d] Cargo type 0x%X, group id 0x%02X", c, ctype, groupid);
 
    ctype = TranslateCargo(feature, ctype);
    if (ctype == CT_INVALID) continue;
 
    for (uint i = 0; i < idcount; i++) {
      EngineID engine = engines[i];
 
      grfmsg(7, "VehicleMapSpriteGroup: [%d] Engine %d...", i, engine);
 
      if (wagover) {
        SetWagonOverrideSprites(engine, ctype, _cur.spritegroups[groupid], last_engines, last_engines_count);
      } else {
        SetCustomEngineSprites(engine, ctype, _cur.spritegroups[groupid]);
      }
    }
  }
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "VehicleMapSpriteGroup")) return;
 
  grfmsg(8, "-- Default group id 0x%04X", groupid);
 
  for (uint i = 0; i < idcount; i++) {
    EngineID engine = engines[i];
 
    if (wagover) {
      SetWagonOverrideSprites(engine, CT_DEFAULT, _cur.spritegroups[groupid], last_engines, last_engines_count);
    } else {
      SetCustomEngineSprites(engine, CT_DEFAULT, _cur.spritegroups[groupid]);
      SetEngineGRF(engine, _cur.grffile);
    }
  }
}
 
 
static void CanalMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  CanalFeature *cfs = AllocaM(CanalFeature, idcount);
  for (uint i = 0; i < idcount; i++) {
    cfs[i] = (CanalFeature)buf->ReadByte();
  }
 
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "CanalMapSpriteGroup")) return;
 
  for (uint i = 0; i < idcount; i++) {
    CanalFeature cf = cfs[i];
 
    if (cf >= CF_END) {
      grfmsg(1, "CanalMapSpriteGroup: Canal subset %d out of range, skipping", cf);
      continue;
    }
 
    _water_feature[cf].grffile = _cur.grffile;
    _water_feature[cf].group = _cur.spritegroups[groupid];
  }
}
 
 
static void StationMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *stations = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    stations[i] = buf->ReadByte();
  }
 
  uint8 cidcount = buf->ReadByte();
  for (uint c = 0; c < cidcount; c++) {
    uint8 ctype = buf->ReadByte();
    uint16 groupid = buf->ReadWord();
    if (!IsValidGroupID(groupid, "StationMapSpriteGroup")) continue;
 
    ctype = TranslateCargo(GSF_STATIONS, ctype);
    if (ctype == CT_INVALID) continue;
 
    for (uint i = 0; i < idcount; i++) {
      StationSpec *statspec = _cur.grffile->stations == nullptr ? nullptr : _cur.grffile->stations[stations[i]];
 
      if (statspec == nullptr) {
        grfmsg(1, "StationMapSpriteGroup: Station with ID 0x%02X does not exist, skipping", stations[i]);
        continue;
      }
 
      statspec->grf_prop.spritegroup[ctype] = _cur.spritegroups[groupid];
    }
  }
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "StationMapSpriteGroup")) return;
 
  for (uint i = 0; i < idcount; i++) {
    StationSpec *statspec = _cur.grffile->stations == nullptr ? nullptr : _cur.grffile->stations[stations[i]];
 
    if (statspec == nullptr) {
      grfmsg(1, "StationMapSpriteGroup: Station with ID 0x%02X does not exist, skipping", stations[i]);
      continue;
    }
 
    if (statspec->grf_prop.grffile != nullptr) {
      grfmsg(1, "StationMapSpriteGroup: Station with ID 0x%02X mapped multiple times, skipping", stations[i]);
      continue;
    }
 
    statspec->grf_prop.spritegroup[CT_DEFAULT] = _cur.spritegroups[groupid];
    statspec->grf_prop.grffile = _cur.grffile;
    statspec->grf_prop.local_id = stations[i];
    StationClass::Assign(statspec);
  }
}
 
 
static void TownHouseMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *houses = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    houses[i] = buf->ReadByte();
  }
 
  /* Skip the cargo type section, we only care about the default group */
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "TownHouseMapSpriteGroup")) return;
 
  if (_cur.grffile->housespec == nullptr) {
    grfmsg(1, "TownHouseMapSpriteGroup: No houses defined, skipping");
    return;
  }
 
  for (uint i = 0; i < idcount; i++) {
    HouseSpec *hs = _cur.grffile->housespec[houses[i]];
 
    if (hs == nullptr) {
      grfmsg(1, "TownHouseMapSpriteGroup: House %d undefined, skipping.", houses[i]);
      continue;
    }
 
    hs->grf_prop.spritegroup[0] = _cur.spritegroups[groupid];
  }
}
 
static void IndustryMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *industries = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    industries[i] = buf->ReadByte();
  }
 
  /* Skip the cargo type section, we only care about the default group */
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "IndustryMapSpriteGroup")) return;
 
  if (_cur.grffile->industryspec == nullptr) {
    grfmsg(1, "IndustryMapSpriteGroup: No industries defined, skipping");
    return;
  }
 
  for (uint i = 0; i < idcount; i++) {
    IndustrySpec *indsp = _cur.grffile->industryspec[industries[i]];
 
    if (indsp == nullptr) {
      grfmsg(1, "IndustryMapSpriteGroup: Industry %d undefined, skipping", industries[i]);
      continue;
    }
 
    indsp->grf_prop.spritegroup[0] = _cur.spritegroups[groupid];
  }
}
 
static void IndustrytileMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *indtiles = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    indtiles[i] = buf->ReadByte();
  }
 
  /* Skip the cargo type section, we only care about the default group */
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "IndustrytileMapSpriteGroup")) return;
 
  if (_cur.grffile->indtspec == nullptr) {
    grfmsg(1, "IndustrytileMapSpriteGroup: No industry tiles defined, skipping");
    return;
  }
 
  for (uint i = 0; i < idcount; i++) {
    IndustryTileSpec *indtsp = _cur.grffile->indtspec[indtiles[i]];
 
    if (indtsp == nullptr) {
      grfmsg(1, "IndustrytileMapSpriteGroup: Industry tile %d undefined, skipping", indtiles[i]);
      continue;
    }
 
    indtsp->grf_prop.spritegroup[0] = _cur.spritegroups[groupid];
  }
}
 
static void CargoMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  CargoID *cargoes = AllocaM(CargoID, idcount);
  for (uint i = 0; i < idcount; i++) {
    cargoes[i] = buf->ReadByte();
  }
 
  /* Skip the cargo type section, we only care about the default group */
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "CargoMapSpriteGroup")) return;
 
  for (uint i = 0; i < idcount; i++) {
    CargoID cid = cargoes[i];
 
    if (cid >= NUM_CARGO) {
      grfmsg(1, "CargoMapSpriteGroup: Cargo ID %d out of range, skipping", cid);
      continue;
    }
 
    CargoSpec *cs = CargoSpec::Get(cid);
    cs->grffile = _cur.grffile;
    cs->group = _cur.spritegroups[groupid];
  }
}
 
static void ObjectMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  if (_cur.grffile->objectspec == nullptr) {
    grfmsg(1, "ObjectMapSpriteGroup: No object tiles defined, skipping");
    return;
  }
 
  uint8 *objects = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    objects[i] = buf->ReadByte();
  }
 
  uint8 cidcount = buf->ReadByte();
  for (uint c = 0; c < cidcount; c++) {
    uint8 ctype = buf->ReadByte();
    uint16 groupid = buf->ReadWord();
    if (!IsValidGroupID(groupid, "ObjectMapSpriteGroup")) continue;
 
    ctype = TranslateCargo(GSF_OBJECTS, ctype);
    if (ctype == CT_INVALID) continue;
 
    for (uint i = 0; i < idcount; i++) {
      ObjectSpec *spec = _cur.grffile->objectspec[objects[i]];
 
      if (spec == nullptr) {
        grfmsg(1, "ObjectMapSpriteGroup: Object with ID 0x%02X undefined, skipping", objects[i]);
        continue;
      }
 
      spec->grf_prop.spritegroup[ctype] = _cur.spritegroups[groupid];
    }
  }
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "ObjectMapSpriteGroup")) return;
 
  for (uint i = 0; i < idcount; i++) {
    ObjectSpec *spec = _cur.grffile->objectspec[objects[i]];
 
    if (spec == nullptr) {
      grfmsg(1, "ObjectMapSpriteGroup: Object with ID 0x%02X undefined, skipping", objects[i]);
      continue;
    }
 
    if (spec->grf_prop.grffile != nullptr) {
      grfmsg(1, "ObjectMapSpriteGroup: Object with ID 0x%02X mapped multiple times, skipping", objects[i]);
      continue;
    }
 
    spec->grf_prop.spritegroup[0] = _cur.spritegroups[groupid];
    spec->grf_prop.grffile        = _cur.grffile;
    spec->grf_prop.local_id       = objects[i];
  }
}
 
static void RailTypeMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *railtypes = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    uint8 id = buf->ReadByte();
    railtypes[i] = id < RAILTYPE_END ? _cur.grffile->railtype_map[id] : INVALID_RAILTYPE;
  }
 
  uint8 cidcount = buf->ReadByte();
  for (uint c = 0; c < cidcount; c++) {
    uint8 ctype = buf->ReadByte();
    uint16 groupid = buf->ReadWord();
    if (!IsValidGroupID(groupid, "RailTypeMapSpriteGroup")) continue;
 
    if (ctype >= RTSG_END) continue;
 
    extern RailtypeInfo _railtypes[RAILTYPE_END];
    for (uint i = 0; i < idcount; i++) {
      if (railtypes[i] != INVALID_RAILTYPE) {
        RailtypeInfo *rti = &_railtypes[railtypes[i]];
 
        rti->grffile[ctype] = _cur.grffile;
        rti->group[ctype] = _cur.spritegroups[groupid];
      }
    }
  }
 
  /* Railtypes do not use the default group. */
  buf->ReadWord();
}
 
static void RoadTypeMapSpriteGroup(ByteReader *buf, uint8 idcount, RoadTramType rtt)
{
  RoadType *type_map = (rtt == RTT_TRAM) ? _cur.grffile->tramtype_map : _cur.grffile->roadtype_map;
 
  uint8 *roadtypes = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    uint8 id = buf->ReadByte();
    roadtypes[i] = id < ROADTYPE_END ? type_map[id] : INVALID_ROADTYPE;
  }
 
  uint8 cidcount = buf->ReadByte();
  for (uint c = 0; c < cidcount; c++) {
    uint8 ctype = buf->ReadByte();
    uint16 groupid = buf->ReadWord();
    if (!IsValidGroupID(groupid, "RoadTypeMapSpriteGroup")) continue;
 
    if (ctype >= ROTSG_END) continue;
 
    extern RoadTypeInfo _roadtypes[ROADTYPE_END];
    for (uint i = 0; i < idcount; i++) {
      if (roadtypes[i] != INVALID_ROADTYPE) {
        RoadTypeInfo *rti = &_roadtypes[roadtypes[i]];
 
        rti->grffile[ctype] = _cur.grffile;
        rti->group[ctype] = _cur.spritegroups[groupid];
      }
    }
  }
 
  /* Roadtypes do not use the default group. */
  buf->ReadWord();
}
 
static void AirportMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *airports = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    airports[i] = buf->ReadByte();
  }
 
  /* Skip the cargo type section, we only care about the default group */
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "AirportMapSpriteGroup")) return;
 
  if (_cur.grffile->airportspec == nullptr) {
    grfmsg(1, "AirportMapSpriteGroup: No airports defined, skipping");
    return;
  }
 
  for (uint i = 0; i < idcount; i++) {
    AirportSpec *as = _cur.grffile->airportspec[airports[i]];
 
    if (as == nullptr) {
      grfmsg(1, "AirportMapSpriteGroup: Airport %d undefined, skipping", airports[i]);
      continue;
    }
 
    as->grf_prop.spritegroup[0] = _cur.spritegroups[groupid];
  }
}
 
static void AirportTileMapSpriteGroup(ByteReader *buf, uint8 idcount)
{
  uint8 *airptiles = AllocaM(uint8, idcount);
  for (uint i = 0; i < idcount; i++) {
    airptiles[i] = buf->ReadByte();
  }
 
  /* Skip the cargo type section, we only care about the default group */
  uint8 cidcount = buf->ReadByte();
  buf->Skip(cidcount * 3);
 
  uint16 groupid = buf->ReadWord();
  if (!IsValidGroupID(groupid, "AirportTileMapSpriteGroup")) return;
 
  if (_cur.grffile->airtspec == nullptr) {
    grfmsg(1, "AirportTileMapSpriteGroup: No airport tiles defined, skipping");
    return;
  }
 
  for (uint i = 0; i < idcount; i++) {
    AirportTileSpec *airtsp = _cur.grffile->airtspec[airptiles[i]];
 
    if (airtsp == nullptr) {
      grfmsg(1, "AirportTileMapSpriteGroup: Airport tile %d undefined, skipping", airptiles[i]);
      continue;
    }
 
    airtsp->grf_prop.spritegroup[0] = _cur.spritegroups[groupid];
  }
}
 
 
/* Action 0x03 */
static void FeatureMapSpriteGroup(ByteReader *buf)
{
  /* <03> <feature> <n-id> <ids>... <num-cid> [<cargo-type> <cid>]... <def-cid>
   * id-list    := [<id>] [id-list]
   * cargo-list := <cargo-type> <cid> [cargo-list]
   *
   * B feature       see action 0
   * B n-id          bits 0-6: how many IDs this definition applies to
   *                 bit 7: if set, this is a wagon override definition (see below)
   * B ids           the IDs for which this definition applies
   * B num-cid       number of cargo IDs (sprite group IDs) in this definition
   *                 can be zero, in that case the def-cid is used always
   * B cargo-type    type of this cargo type (e.g. mail=2, wood=7, see below)
   * W cid           cargo ID (sprite group ID) for this type of cargo
   * W def-cid       default cargo ID (sprite group ID) */
 
  uint8 feature = buf->ReadByte();
  uint8 idcount = buf->ReadByte();
 
  if (feature >= GSF_END) {
    grfmsg(1, "FeatureMapSpriteGroup: Unsupported feature 0x%02X, skipping", feature);
    return;
  }
 
  /* If idcount is zero, this is a feature callback */
  if (idcount == 0) {
    /* Skip number of cargo ids? */
    buf->ReadByte();
    uint16 groupid = buf->ReadWord();
    if (!IsValidGroupID(groupid, "FeatureMapSpriteGroup")) return;
 
    grfmsg(6, "FeatureMapSpriteGroup: Adding generic feature callback for feature 0x%02X", feature);
 
    AddGenericCallback(feature, _cur.grffile, _cur.spritegroups[groupid]);
    return;
  }
 
  /* Mark the feature as used by the grf (generic callbacks do not count) */
  SetBit(_cur.grffile->grf_features, feature);
 
  grfmsg(6, "FeatureMapSpriteGroup: Feature 0x%02X, %d ids", feature, idcount);
 
  switch (feature) {
    case GSF_TRAINS:
    case GSF_ROADVEHICLES:
    case GSF_SHIPS:
    case GSF_AIRCRAFT:
      VehicleMapSpriteGroup(buf, feature, idcount);
      return;
 
    case GSF_CANALS:
      CanalMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_STATIONS:
      StationMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_HOUSES:
      TownHouseMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_INDUSTRIES:
      IndustryMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_INDUSTRYTILES:
      IndustrytileMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_CARGOES:
      CargoMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_AIRPORTS:
      AirportMapSpriteGroup(buf, idcount);
      return;
 
    case GSF_OBJECTS:
      ObjectMapSpriteGroup(buf, idcount);
      break;
 
    case GSF_RAILTYPES:
      RailTypeMapSpriteGroup(buf, idcount);
      break;
 
    case GSF_ROADTYPES:
      RoadTypeMapSpriteGroup(buf, idcount, RTT_ROAD);
      break;
 
    case GSF_TRAMTYPES:
      RoadTypeMapSpriteGroup(buf, idcount, RTT_TRAM);
      break;
 
    case GSF_AIRPORTTILES:
      AirportTileMapSpriteGroup(buf, idcount);
      return;
 
    default:
      grfmsg(1, "FeatureMapSpriteGroup: Unsupported feature 0x%02X, skipping", feature);
      return;
  }
}
 
/* Action 0x04 */
static void FeatureNewName(ByteReader *buf)
{
  /* <04> <veh-type> <language-id> <num-veh> <offset> <data...>
   *
   * B veh-type      see action 0 (as 00..07, + 0A
   *                 But IF veh-type = 48, then generic text
   * B language-id   If bit 6 is set, This is the extended language scheme,
   *                 with up to 64 language.
   *                 Otherwise, it is a mapping where set bits have meaning
   *                 0 = american, 1 = english, 2 = german, 3 = french, 4 = spanish
   *                 Bit 7 set means this is a generic text, not a vehicle one (or else)
   * B num-veh       number of vehicles which are getting a new name
   * B/W offset      number of the first vehicle that gets a new name
   *                 Byte : ID of vehicle to change
   *                 Word : ID of string to change/add
   * S data          new texts, each of them zero-terminated, after
   *                 which the next name begins. */
 
  bool new_scheme = _cur.grffile->grf_version >= 7;
 
  uint8 feature  = buf->ReadByte();
  if (feature >= GSF_END && feature != 0x48) {
    grfmsg(1, "FeatureNewName: Unsupported feature 0x%02X, skipping", feature);
    return;
  }
 
  uint8 lang     = buf->ReadByte();
  uint8 num      = buf->ReadByte();
  bool generic   = HasBit(lang, 7);
  uint16 id;
  if (generic) {
    id = buf->ReadWord();
  } else if (feature <= GSF_AIRCRAFT) {
    id = buf->ReadExtendedByte();
  } else {
    id = buf->ReadByte();
  }
 
  ClrBit(lang, 7);
 
  uint16 endid = id + num;
 
  grfmsg(6, "FeatureNewName: About to rename engines %d..%d (feature 0x%02X) in language 0x%02X",
                 id, endid, feature, lang);
 
  for (; id < endid && buf->HasData(); id++) {
    const char *name = buf->ReadString();
    grfmsg(8, "FeatureNewName: 0x%04X <- %s", id, name);
 
    switch (feature) {
      case GSF_TRAINS:
      case GSF_ROADVEHICLES:
      case GSF_SHIPS:
      case GSF_AIRCRAFT:
        if (!generic) {
          Engine *e = GetNewEngine(_cur.grffile, (VehicleType)feature, id, HasBit(_cur.grfconfig->flags, GCF_STATIC));
          if (e == nullptr) break;
          StringID string = AddGRFString(_cur.grffile->grfid, e->index, lang, new_scheme, false, name, e->info.string_id);
          e->info.string_id = string;
        } else {
          AddGRFString(_cur.grffile->grfid, id, lang, new_scheme, true, name, STR_UNDEFINED);
        }
        break;
 
      default:
        if (IsInsideMM(id, 0xD000, 0xD400) || IsInsideMM(id, 0xD800, 0xE000)) {
          AddGRFString(_cur.grffile->grfid, id, lang, new_scheme, true, name, STR_UNDEFINED);
          break;
        }
 
        switch (GB(id, 8, 8)) {
          case 0xC4: // Station class name
            if (_cur.grffile->stations == nullptr || _cur.grffile->stations[GB(id, 0, 8)] == nullptr) {
              grfmsg(1, "FeatureNewName: Attempt to name undefined station 0x%X, ignoring", GB(id, 0, 8));
            } else {
              StationClassID cls_id = _cur.grffile->stations[GB(id, 0, 8)]->cls_id;
              StationClass::Get(cls_id)->name = AddGRFString(_cur.grffile->grfid, id, lang, new_scheme, false, name, STR_UNDEFINED);
            }
            break;
 
          case 0xC5: // Station name
            if (_cur.grffile->stations == nullptr || _cur.grffile->stations[GB(id, 0, 8)] == nullptr) {
              grfmsg(1, "FeatureNewName: Attempt to name undefined station 0x%X, ignoring", GB(id, 0, 8));
            } else {
              _cur.grffile->stations[GB(id, 0, 8)]->name = AddGRFString(_cur.grffile->grfid, id, lang, new_scheme, false, name, STR_UNDEFINED);
            }
            break;
 
          case 0xC7: // Airporttile name
            if (_cur.grffile->airtspec == nullptr || _cur.grffile->airtspec[GB(id, 0, 8)] == nullptr) {
              grfmsg(1, "FeatureNewName: Attempt to name undefined airport tile 0x%X, ignoring", GB(id, 0, 8));
            } else {
              _cur.grffile->airtspec[GB(id, 0, 8)]->name = AddGRFString(_cur.grffile->grfid, id, lang, new_scheme, false, name, STR_UNDEFINED);
            }
            break;
 
          case 0xC9: // House name
            if (_cur.grffile->housespec == nullptr || _cur.grffile->housespec[GB(id, 0, 8)] == nullptr) {
              grfmsg(1, "FeatureNewName: Attempt to name undefined house 0x%X, ignoring.", GB(id, 0, 8));
            } else {
              _cur.grffile->housespec[GB(id, 0, 8)]->building_name = AddGRFString(_cur.grffile->grfid, id, lang, new_scheme, false, name, STR_UNDEFINED);
            }
            break;
 
          default:
            grfmsg(7, "FeatureNewName: Unsupported ID (0x%04X)", id);
            break;
        }
        break;
    }
  }
}
 
static uint16 SanitizeSpriteOffset(uint16& num, uint16 offset, int max_sprites, const char *name)
{
 
  if (offset >= max_sprites) {
    grfmsg(1, "GraphicsNew: %s sprite offset must be less than %i, skipping", name, max_sprites);
    uint orig_num = num;
    num = 0;
    return orig_num;
  }
 
  if (offset + num > max_sprites) {
    grfmsg(4, "GraphicsNew: %s sprite overflow, truncating...", name);
    uint orig_num = num;
    num = std::max(max_sprites - offset, 0);
    return orig_num - num;
  }
 
  return 0;
}
 
 
enum Action5BlockType {
  A5BLOCK_FIXED,                
  A5BLOCK_ALLOW_OFFSET,         
  A5BLOCK_INVALID,              
};
struct Action5Type {
  Action5BlockType block_type;  
  SpriteID sprite_base;         
  uint16 min_sprites;           
  uint16 max_sprites;           
  const char *name;             
};
 
static const Action5Type _action5_types[] = {
  /* Note: min_sprites should not be changed. Therefore these constants are directly here and not in sprites.h */
  /* 0x00 */ { A5BLOCK_INVALID,      0,                            0, 0,                                           "Type 0x00"                },
  /* 0x01 */ { A5BLOCK_INVALID,      0,                            0, 0,                                           "Type 0x01"                },
  /* 0x02 */ { A5BLOCK_INVALID,      0,                            0, 0,                                           "Type 0x02"                },
  /* 0x03 */ { A5BLOCK_INVALID,      0,                            0, 0,                                           "Type 0x03"                },
  /* 0x04 */ { A5BLOCK_ALLOW_OFFSET, SPR_SIGNALS_BASE,             1, PRESIGNAL_SEMAPHORE_AND_PBS_SPRITE_COUNT,    "Signal graphics"          },
  /* 0x05 */ { A5BLOCK_ALLOW_OFFSET, SPR_ELRAIL_BASE,              1, ELRAIL_SPRITE_COUNT,                         "Rail catenary graphics"   },
  /* 0x06 */ { A5BLOCK_ALLOW_OFFSET, SPR_SLOPES_BASE,              1, NORMAL_AND_HALFTILE_FOUNDATION_SPRITE_COUNT, "Foundation graphics"      },
  /* 0x07 */ { A5BLOCK_INVALID,      0,                           75, 0,                                           "TTDP GUI graphics"        }, // Not used by OTTD.
  /* 0x08 */ { A5BLOCK_ALLOW_OFFSET, SPR_CANALS_BASE,              1, CANALS_SPRITE_COUNT,                         "Canal graphics"           },
  /* 0x09 */ { A5BLOCK_ALLOW_OFFSET, SPR_ONEWAY_BASE,              1, ONEWAY_SPRITE_COUNT,                         "One way road graphics"    },
  /* 0x0A */ { A5BLOCK_ALLOW_OFFSET, SPR_2CCMAP_BASE,              1, TWOCCMAP_SPRITE_COUNT,                       "2CC colour maps"          },
  /* 0x0B */ { A5BLOCK_ALLOW_OFFSET, SPR_TRAMWAY_BASE,             1, TRAMWAY_SPRITE_COUNT,                        "Tramway graphics"         },
  /* 0x0C */ { A5BLOCK_INVALID,      0,                          133, 0,                                           "Snowy temperate tree"     }, // Not yet used by OTTD.
  /* 0x0D */ { A5BLOCK_FIXED,        SPR_SHORE_BASE,              16, SPR_SHORE_SPRITE_COUNT,                      "Shore graphics"           },
  /* 0x0E */ { A5BLOCK_INVALID,      0,                            0, 0,                                           "New Signals graphics"     }, // Not yet used by OTTD.
  /* 0x0F */ { A5BLOCK_ALLOW_OFFSET, SPR_TRACKS_FOR_SLOPES_BASE,   1, TRACKS_FOR_SLOPES_SPRITE_COUNT,              "Sloped rail track"        },
  /* 0x10 */ { A5BLOCK_ALLOW_OFFSET, SPR_AIRPORTX_BASE,            1, AIRPORTX_SPRITE_COUNT,                       "Airport graphics"         },
  /* 0x11 */ { A5BLOCK_ALLOW_OFFSET, SPR_ROADSTOP_BASE,            1, ROADSTOP_SPRITE_COUNT,                       "Road stop graphics"       },
  /* 0x12 */ { A5BLOCK_ALLOW_OFFSET, SPR_AQUEDUCT_BASE,            1, AQUEDUCT_SPRITE_COUNT,                       "Aqueduct graphics"        },
  /* 0x13 */ { A5BLOCK_ALLOW_OFFSET, SPR_AUTORAIL_BASE,            1, AUTORAIL_SPRITE_COUNT,                       "Autorail graphics"        },
  /* 0x14 */ { A5BLOCK_INVALID,      0,                            1, 0,                                           "Flag graphics"            }, // deprecated, no longer used.
  /* 0x15 */ { A5BLOCK_ALLOW_OFFSET, SPR_OPENTTD_BASE,             1, OPENTTD_SPRITE_COUNT,                        "OpenTTD GUI graphics"     },
  /* 0x16 */ { A5BLOCK_ALLOW_OFFSET, SPR_AIRPORT_PREVIEW_BASE,     1, SPR_AIRPORT_PREVIEW_COUNT,                   "Airport preview graphics" },
  /* 0x17 */ { A5BLOCK_ALLOW_OFFSET, SPR_RAILTYPE_TUNNEL_BASE,     1, RAILTYPE_TUNNEL_BASE_COUNT,                  "Railtype tunnel base"     },
  /* 0x18 */ { A5BLOCK_ALLOW_OFFSET, SPR_PALETTE_BASE,             1, PALETTE_SPRITE_COUNT,                        "Palette"                  },
};
 
/* Action 0x05 */
static void GraphicsNew(ByteReader *buf)
{
  /* <05> <graphics-type> <num-sprites> <other data...>
   *
   * B graphics-type What set of graphics the sprites define.
   * E num-sprites   How many sprites are in this set?
   * V other data    Graphics type specific data.  Currently unused. */
 
  uint8 type = buf->ReadByte();
  uint16 num = buf->ReadExtendedByte();
  uint16 offset = HasBit(type, 7) ? buf->ReadExtendedByte() : 0;
  ClrBit(type, 7); // Clear the high bit as that only indicates whether there is an offset.
 
  if ((type == 0x0D) && (num == 10) && HasBit(_cur.grfconfig->flags, GCF_SYSTEM)) {
    /* Special not-TTDP-compatible case used in openttd.grf
     * Missing shore sprites and initialisation of SPR_SHORE_BASE */
    grfmsg(2, "GraphicsNew: Loading 10 missing shore sprites from extra grf.");
    LoadNextSprite(SPR_SHORE_BASE +  0, *_cur.file, _cur.nfo_line++); // SLOPE_STEEP_S
    LoadNextSprite(SPR_SHORE_BASE +  5, *_cur.file, _cur.nfo_line++); // SLOPE_STEEP_W
    LoadNextSprite(SPR_SHORE_BASE +  7, *_cur.file, _cur.nfo_line++); // SLOPE_WSE
    LoadNextSprite(SPR_SHORE_BASE + 10, *_cur.file, _cur.nfo_line++); // SLOPE_STEEP_N
    LoadNextSprite(SPR_SHORE_BASE + 11, *_cur.file, _cur.nfo_line++); // SLOPE_NWS
    LoadNextSprite(SPR_SHORE_BASE + 13, *_cur.file, _cur.nfo_line++); // SLOPE_ENW
    LoadNextSprite(SPR_SHORE_BASE + 14, *_cur.file, _cur.nfo_line++); // SLOPE_SEN
    LoadNextSprite(SPR_SHORE_BASE + 15, *_cur.file, _cur.nfo_line++); // SLOPE_STEEP_E
    LoadNextSprite(SPR_SHORE_BASE + 16, *_cur.file, _cur.nfo_line++); // SLOPE_EW
    LoadNextSprite(SPR_SHORE_BASE + 17, *_cur.file, _cur.nfo_line++); // SLOPE_NS
    if (_loaded_newgrf_features.shore == SHORE_REPLACE_NONE) _loaded_newgrf_features.shore = SHORE_REPLACE_ONLY_NEW;
    return;
  }
 
  /* Supported type? */
  if ((type >= lengthof(_action5_types)) || (_action5_types[type].block_type == A5BLOCK_INVALID)) {
    grfmsg(2, "GraphicsNew: Custom graphics (type 0x%02X) sprite block of length %u (unimplemented, ignoring)", type, num);
    _cur.skip_sprites = num;
    return;
  }
 
  const Action5Type *action5_type = &_action5_types[type];
 
  /* Contrary to TTDP we allow always to specify too few sprites as we allow always an offset,
   * except for the long version of the shore type:
   * Ignore offset if not allowed */
  if ((action5_type->block_type != A5BLOCK_ALLOW_OFFSET) && (offset != 0)) {
    grfmsg(1, "GraphicsNew: %s (type 0x%02X) do not allow an <offset> field. Ignoring offset.", action5_type->name, type);
    offset = 0;
  }
 
  /* Ignore action5 if too few sprites are specified. (for TTDP compatibility)
   * This does not make sense, if <offset> is allowed */
  if ((action5_type->block_type == A5BLOCK_FIXED) && (num < action5_type->min_sprites)) {
    grfmsg(1, "GraphicsNew: %s (type 0x%02X) count must be at least %d. Only %d were specified. Skipping.", action5_type->name, type, action5_type->min_sprites, num);
    _cur.skip_sprites = num;
    return;
  }
 
  /* Load at most max_sprites sprites. Skip remaining sprites. (for compatibility with TTDP and future extensions) */
  uint16 skip_num = SanitizeSpriteOffset(num, offset, action5_type->max_sprites, action5_type->name);
  SpriteID replace = action5_type->sprite_base + offset;
 
  /* Load <num> sprites starting from <replace>, then skip <skip_num> sprites. */
  grfmsg(2, "GraphicsNew: Replacing sprites %d to %d of %s (type 0x%02X) at SpriteID 0x%04X", offset, offset + num - 1, action5_type->name, type, replace);
 
  if (type == 0x0D) _loaded_newgrf_features.shore = SHORE_REPLACE_ACTION_5;
 
  if (type == 0x0B) {
    static const SpriteID depot_with_track_offset = SPR_TRAMWAY_DEPOT_WITH_TRACK - SPR_TRAMWAY_BASE;
    static const SpriteID depot_no_track_offset = SPR_TRAMWAY_DEPOT_NO_TRACK - SPR_TRAMWAY_BASE;
    if (offset <= depot_with_track_offset && offset + num > depot_with_track_offset) _loaded_newgrf_features.tram = TRAMWAY_REPLACE_DEPOT_WITH_TRACK;
    if (offset <= depot_no_track_offset && offset + num > depot_no_track_offset) _loaded_newgrf_features.tram = TRAMWAY_REPLACE_DEPOT_NO_TRACK;
  }
 
  /* If the baseset or grf only provides sprites for flat tiles (pre #10282), duplicate those for use on slopes. */
  bool dup_oneway_sprites = ((type == 0x09) && (offset + num <= SPR_ONEWAY_SLOPE_N_OFFSET));
 
  for (; num > 0; num--) {
    _cur.nfo_line++;
    int load_index = (replace == 0 ? _cur.spriteid++ : replace++);
    LoadNextSprite(load_index, *_cur.file, _cur.nfo_line);
    if (dup_oneway_sprites) {
      DupSprite(load_index, load_index + SPR_ONEWAY_SLOPE_N_OFFSET);
      DupSprite(load_index, load_index + SPR_ONEWAY_SLOPE_S_OFFSET);
    }
  }
 
  _cur.skip_sprites = skip_num;
}
 
/* Action 0x05 (SKIP) */
static void SkipAct5(ByteReader *buf)
{
  /* Ignore type byte */
  buf->ReadByte();
 
  /* Skip the sprites of this action */
  _cur.skip_sprites = buf->ReadExtendedByte();
 
  grfmsg(3, "SkipAct5: Skipping %d sprites", _cur.skip_sprites);
}
 
bool GetGlobalVariable(byte param, uint32 *value, const GRFFile *grffile)
{
  switch (param) {
    case 0x00: // current date
      *value = std::max(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0);
      return true;
 
    case 0x01: // current year
      *value = Clamp(_cur_year, ORIGINAL_BASE_YEAR, ORIGINAL_MAX_YEAR) - ORIGINAL_BASE_YEAR;
      return true;
 
    case 0x02: { // detailed date information: month of year (bit 0-7), day of month (bit 8-12), leap year (bit 15), day of year (bit 16-24)
      YearMonthDay ymd;
      ConvertDateToYMD(_date, &ymd);
      Date start_of_year = ConvertYMDToDate(ymd.year, 0, 1);
      *value = ymd.month | (ymd.day - 1) << 8 | (IsLeapYear(ymd.year) ? 1 << 15 : 0) | (_date - start_of_year) << 16;
      return true;
    }
 
    case 0x03: // current climate, 0=temp, 1=arctic, 2=trop, 3=toyland
      *value = _settings_game.game_creation.landscape;
      return true;
 
    case 0x06: // road traffic side, bit 4 clear=left, set=right
      *value = _settings_game.vehicle.road_side << 4;
      return true;
 
    case 0x09: // date fraction
      *value = _date_fract * 885;
      return true;
 
    case 0x0A: // animation counter
      *value = GB(_tick_counter, 0, 16);
      return true;
 
    case 0x0B: { // TTDPatch version
      uint major    = 2;
      uint minor    = 6;
      uint revision = 1; // special case: 2.0.1 is 2.0.10
      uint build    = 1382;
      *value = (major << 24) | (minor << 20) | (revision << 16) | build;
      return true;
    }
 
    case 0x0D: // TTD Version, 00=DOS, 01=Windows
      *value = _cur.grfconfig->palette & GRFP_USE_MASK;
      return true;
 
    case 0x0E: // Y-offset for train sprites
      *value = _cur.grffile->traininfo_vehicle_pitch;
      return true;
 
    case 0x0F: // Rail track type cost factors
      *value = 0;
      SB(*value, 0, 8, GetRailTypeInfo(RAILTYPE_RAIL)->cost_multiplier); // normal rail
      if (_settings_game.vehicle.disable_elrails) {
        /* skip elrail multiplier - disabled */
        SB(*value, 8, 8, GetRailTypeInfo(RAILTYPE_MONO)->cost_multiplier); // monorail
      } else {
        SB(*value, 8, 8, GetRailTypeInfo(RAILTYPE_ELECTRIC)->cost_multiplier); // electified railway
        /* Skip monorail multiplier - no space in result */
      }
      SB(*value, 16, 8, GetRailTypeInfo(RAILTYPE_MAGLEV)->cost_multiplier); // maglev
      return true;
 
    case 0x11: // current rail tool type
      *value = 0; // constant fake value to avoid desync
      return true;
 
    case 0x12: // Game mode
      *value = _game_mode;
      return true;
 
    /* case 0x13: // Tile refresh offset to left    not implemented */
    /* case 0x14: // Tile refresh offset to right   not implemented */
    /* case 0x15: // Tile refresh offset upwards    not implemented */
    /* case 0x16: // Tile refresh offset downwards  not implemented */
    /* case 0x17: // temperate snow line            not implemented */
 
    case 0x1A: // Always -1
      *value = UINT_MAX;
      return true;
 
    case 0x1B: // Display options
      *value = 0x3F; // constant fake value to avoid desync
      return true;
 
    case 0x1D: // TTD Platform, 00=TTDPatch, 01=OpenTTD
      *value = 1;
      return true;
 
    case 0x1E: // Miscellaneous GRF features
      *value = _misc_grf_features;
 
      /* Add the local flags */
      assert(!HasBit(*value, GMB_TRAIN_WIDTH_32_PIXELS));
      if (_cur.grffile->traininfo_vehicle_width == VEHICLEINFO_FULL_VEHICLE_WIDTH) SetBit(*value, GMB_TRAIN_WIDTH_32_PIXELS);
      return true;
 
    /* case 0x1F: // locale dependent settings not implemented to avoid desync */
 
    case 0x20: { // snow line height
      byte snowline = GetSnowLine();
      if (_settings_game.game_creation.landscape == LT_ARCTIC && snowline <= _settings_game.construction.map_height_limit) {
        *value = Clamp(snowline * (grffile->grf_version >= 8 ? 1 : TILE_HEIGHT), 0, 0xFE);
      } else {
        /* No snow */
        *value = 0xFF;
      }
      return true;
    }
 
    case 0x21: // OpenTTD version
      *value = _openttd_newgrf_version;
      return true;
 
    case 0x22: // difficulty level
      *value = SP_CUSTOM;
      return true;
 
    case 0x23: // long format date
      *value = _date;
      return true;
 
    case 0x24: // long format year
      *value = _cur_year;
      return true;
 
    default: return false;
  }
}
 
static uint32 GetParamVal(byte param, uint32 *cond_val)
{
  /* First handle variable common with VarAction2 */
  uint32 value;
  if (GetGlobalVariable(param - 0x80, &value, _cur.grffile)) return value;
 
  /* Non-common variable */
  switch (param) {
    case 0x84: { // GRF loading stage
      uint32 res = 0;
 
      if (_cur.stage > GLS_INIT) SetBit(res, 0);
      if (_cur.stage == GLS_RESERVE) SetBit(res, 8);
      if (_cur.stage == GLS_ACTIVATION) SetBit(res, 9);
      return res;
    }
 
    case 0x85: // TTDPatch flags, only for bit tests
      if (cond_val == nullptr) {
        /* Supported in Action 0x07 and 0x09, not 0x0D */
        return 0;
      } else {
        uint32 index = *cond_val / 0x20;
        uint32 param_val = index < lengthof(_ttdpatch_flags) ? _ttdpatch_flags[index] : 0;
        *cond_val %= 0x20;
        return param_val;
      }
 
    case 0x88: // GRF ID check
      return 0;
 
    /* case 0x99: Global ID offset not implemented */
 
    default:
      /* GRF Parameter */
      if (param < 0x80) return _cur.grffile->GetParam(param);
 
      /* In-game variable. */
      grfmsg(1, "Unsupported in-game variable 0x%02X", param);
      return UINT_MAX;
  }
}
 
/* Action 0x06 */
static void CfgApply(ByteReader *buf)
{
  /* <06> <param-num> <param-size> <offset> ... <FF>
   *
   * B param-num     Number of parameter to substitute (First = "zero")
   *                 Ignored if that parameter was not specified in newgrf.cfg
   * B param-size    How many bytes to replace.  If larger than 4, the
   *                 bytes of the following parameter are used.  In that
   *                 case, nothing is applied unless *all* parameters
   *                 were specified.
   * B offset        Offset into data from beginning of next sprite
   *                 to place where parameter is to be stored. */
 
  /* Preload the next sprite */
  SpriteFile &file = *_cur.file;
  size_t pos = file.GetPos();
  uint32 num = file.GetContainerVersion() >= 2 ? file.ReadDword() : file.ReadWord();
  uint8 type = file.ReadByte();
  byte *preload_sprite = nullptr;
 
  /* Check if the sprite is a pseudo sprite. We can't operate on real sprites. */
  if (type == 0xFF) {
    preload_sprite = MallocT<byte>(num);
    file.ReadBlock(preload_sprite, num);
  }
 
  /* Reset the file position to the start of the next sprite */
  file.SeekTo(pos, SEEK_SET);
 
  if (type != 0xFF) {
    grfmsg(2, "CfgApply: Ignoring (next sprite is real, unsupported)");
    free(preload_sprite);
    return;
  }
 
  GRFLocation location(_cur.grfconfig->ident.grfid, _cur.nfo_line + 1);
  GRFLineToSpriteOverride::iterator it = _grf_line_to_action6_sprite_override.find(location);
  if (it != _grf_line_to_action6_sprite_override.end()) {
    free(preload_sprite);
    preload_sprite = _grf_line_to_action6_sprite_override[location];
  } else {
    _grf_line_to_action6_sprite_override[location] = preload_sprite;
  }
 
  /* Now perform the Action 0x06 on our data. */
 
  for (;;) {
    uint i;
    uint param_num;
    uint param_size;
    uint offset;
    bool add_value;
 
    /* Read the parameter to apply. 0xFF indicates no more data to change. */
    param_num = buf->ReadByte();
    if (param_num == 0xFF) break;
 
    /* Get the size of the parameter to use. If the size covers multiple
     * double words, sequential parameter values are used. */
    param_size = buf->ReadByte();
 
    /* Bit 7 of param_size indicates we should add to the original value
     * instead of replacing it. */
    add_value  = HasBit(param_size, 7);
    param_size = GB(param_size, 0, 7);
 
    /* Where to apply the data to within the pseudo sprite data. */
    offset     = buf->ReadExtendedByte();
 
    /* If the parameter is a GRF parameter (not an internal variable) check
     * if it (and all further sequential parameters) has been defined. */
    if (param_num < 0x80 && (param_num + (param_size - 1) / 4) >= _cur.grffile->param_end) {
      grfmsg(2, "CfgApply: Ignoring (param %d not set)", (param_num + (param_size - 1) / 4));
      break;
    }
 
    grfmsg(8, "CfgApply: Applying %u bytes from parameter 0x%02X at offset 0x%04X", param_size, param_num, offset);
 
    bool carry = false;
    for (i = 0; i < param_size && offset + i < num; i++) {
      uint32 value = GetParamVal(param_num + i / 4, nullptr);
      /* Reset carry flag for each iteration of the variable (only really
       * matters if param_size is greater than 4) */
      if (i % 4 == 0) carry = false;
 
      if (add_value) {
        uint new_value = preload_sprite[offset + i] + GB(value, (i % 4) * 8, 8) + (carry ? 1 : 0);
        preload_sprite[offset + i] = GB(new_value, 0, 8);
        /* Check if the addition overflowed */
        carry = new_value >= 256;
      } else {
        preload_sprite[offset + i] = GB(value, (i % 4) * 8, 8);
      }
    }
  }
}
 
static void DisableStaticNewGRFInfluencingNonStaticNewGRFs(GRFConfig *c)
{
  GRFError *error = DisableGrf(STR_NEWGRF_ERROR_STATIC_GRF_CAUSES_DESYNC, c);
  error->data = _cur.grfconfig->GetName();
}
 
/* Action 0x07
 * Action 0x09 */
static void SkipIf(ByteReader *buf)
{
  /* <07/09> <param-num> <param-size> <condition-type> <value> <num-sprites>
   *
   * B param-num
   * B param-size
   * B condition-type
   * V value
   * B num-sprites */
  uint32 cond_val = 0;
  uint32 mask = 0;
  bool result;
 
  uint8 param     = buf->ReadByte();
  uint8 paramsize = buf->ReadByte();
  uint8 condtype  = buf->ReadByte();
 
  if (condtype < 2) {
    /* Always 1 for bit tests, the given value should be ignored. */
    paramsize = 1;
  }
 
  switch (paramsize) {
    case 8: cond_val = buf->ReadDWord(); mask = buf->ReadDWord(); break;
    case 4: cond_val = buf->ReadDWord(); mask = 0xFFFFFFFF; break;
    case 2: cond_val = buf->ReadWord();  mask = 0x0000FFFF; break;
    case 1: cond_val = buf->ReadByte();  mask = 0x000000FF; break;
    default: break;
  }
 
  if (param < 0x80 && _cur.grffile->param_end <= param) {
    grfmsg(7, "SkipIf: Param %d undefined, skipping test", param);
    return;
  }
 
  grfmsg(7, "SkipIf: Test condtype %d, param 0x%02X, condval 0x%08X", condtype, param, cond_val);
 
  /* condtypes that do not use 'param' are always valid.
   * condtypes that use 'param' are either not valid for param 0x88, or they are only valid for param 0x88.
   */
  if (condtype >= 0x0B) {
    /* Tests that ignore 'param' */
    switch (condtype) {
      case 0x0B: result = GetCargoIDByLabel(BSWAP32(cond_val)) == CT_INVALID;
        break;
      case 0x0C: result = GetCargoIDByLabel(BSWAP32(cond_val)) != CT_INVALID;
        break;
      case 0x0D: result = GetRailTypeByLabel(BSWAP32(cond_val)) == INVALID_RAILTYPE;
        break;
      case 0x0E: result = GetRailTypeByLabel(BSWAP32(cond_val)) != INVALID_RAILTYPE;
        break;
      case 0x0F: {
        RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
        result = rt == INVALID_ROADTYPE || !RoadTypeIsRoad(rt);
        break;
      }
      case 0x10: {
        RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
        result = rt != INVALID_ROADTYPE && RoadTypeIsRoad(rt);
        break;
      }
      case 0x11: {
        RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
        result = rt == INVALID_ROADTYPE || !RoadTypeIsTram(rt);
        break;
      }
      case 0x12: {
        RoadType rt = GetRoadTypeByLabel(BSWAP32(cond_val));
        result = rt != INVALID_ROADTYPE && RoadTypeIsTram(rt);
        break;
      }
      default: grfmsg(1, "SkipIf: Unsupported condition type %02X. Ignoring", condtype); return;
    }
  } else if (param == 0x88) {
    /* GRF ID checks */
 
    GRFConfig *c = GetGRFConfig(cond_val, mask);
 
    if (c != nullptr && HasBit(c->flags, GCF_STATIC) && !HasBit(_cur.grfconfig->flags, GCF_STATIC) && _networking) {
      DisableStaticNewGRFInfluencingNonStaticNewGRFs(c);
      c = nullptr;
    }
 
    if (condtype != 10 && c == nullptr) {
      grfmsg(7, "SkipIf: GRFID 0x%08X unknown, skipping test", BSWAP32(cond_val));
      return;
    }
 
    switch (condtype) {
      /* Tests 0x06 to 0x0A are only for param 0x88, GRFID checks */
      case 0x06: // Is GRFID active?
        result = c->status == GCS_ACTIVATED;
        break;
 
      case 0x07: // Is GRFID non-active?
        result = c->status != GCS_ACTIVATED;
        break;
 
      case 0x08: // GRFID is not but will be active?
        result = c->status == GCS_INITIALISED;
        break;
 
      case 0x09: // GRFID is or will be active?
        result = c->status == GCS_ACTIVATED || c->status == GCS_INITIALISED;
        break;
 
      case 0x0A: // GRFID is not nor will be active
        /* This is the only condtype that doesn't get ignored if the GRFID is not found */
        result = c == nullptr || c->status == GCS_DISABLED || c->status == GCS_NOT_FOUND;
        break;
 
      default: grfmsg(1, "SkipIf: Unsupported GRF condition type %02X. Ignoring", condtype); return;
    }
  } else {
    /* Tests that use 'param' and are not GRF ID checks.  */
    uint32 param_val = GetParamVal(param, &cond_val); // cond_val is modified for param == 0x85
    switch (condtype) {
      case 0x00: result = !!(param_val & (1 << cond_val));
        break;
      case 0x01: result = !(param_val & (1 << cond_val));
        break;
      case 0x02: result = (param_val & mask) == cond_val;
        break;
      case 0x03: result = (param_val & mask) != cond_val;
        break;
      case 0x04: result = (param_val & mask) < cond_val;
        break;
      case 0x05: result = (param_val & mask) > cond_val;
        break;
      default: grfmsg(1, "SkipIf: Unsupported condition type %02X. Ignoring", condtype); return;
    }
  }
 
  if (!result) {
    grfmsg(2, "SkipIf: Not skipping sprites, test was false");
    return;
  }
 
  uint8 numsprites = buf->ReadByte();
 
  /* numsprites can be a GOTO label if it has been defined in the GRF
   * file. The jump will always be the first matching label that follows
   * the current nfo_line. If no matching label is found, the first matching
   * label in the file is used. */
  const GRFLabel *choice = nullptr;
  for (const auto &label : _cur.grffile->labels) {
    if (label.label != numsprites) continue;
 
    /* Remember a goto before the current line */
    if (choice == nullptr) choice = &label;
    /* If we find a label here, this is definitely good */
    if (label.nfo_line > _cur.nfo_line) {
      choice = &label;
      break;
    }
  }
 
  if (choice != nullptr) {
    grfmsg(2, "SkipIf: Jumping to label 0x%0X at line %d, test was true", choice->label, choice->nfo_line);
    _cur.file->SeekTo(choice->pos, SEEK_SET);
    _cur.nfo_line = choice->nfo_line;
    return;
  }
 
  grfmsg(2, "SkipIf: Skipping %d sprites, test was true", numsprites);
  _cur.skip_sprites = numsprites;
  if (_cur.skip_sprites == 0) {
    /* Zero means there are no sprites to skip, so
     * we use -1 to indicate that all further
     * sprites should be skipped. */
    _cur.skip_sprites = -1;
 
    /* If an action 8 hasn't been encountered yet, disable the grf. */
    if (_cur.grfconfig->status != (_cur.stage < GLS_RESERVE ? GCS_INITIALISED : GCS_ACTIVATED)) {
      DisableGrf();
    }
  }
}
 
 
/* Action 0x08 (GLS_FILESCAN) */
static void ScanInfo(ByteReader *buf)
{
  uint8 grf_version = buf->ReadByte();
  uint32 grfid      = buf->ReadDWord();
  const char *name  = buf->ReadString();
 
  _cur.grfconfig->ident.grfid = grfid;
 
  if (grf_version < 2 || grf_version > 8) {
    SetBit(_cur.grfconfig->flags, GCF_INVALID);
    Debug(grf, 0, "{}: NewGRF \"{}\" (GRFID {:08X}) uses GRF version {}, which is incompatible with this version of OpenTTD.", _cur.grfconfig->filename, name, BSWAP32(grfid), grf_version);
  }
 
  /* GRF IDs starting with 0xFF are reserved for internal TTDPatch use */
  if (GB(grfid, 0, 8) == 0xFF) SetBit(_cur.grfconfig->flags, GCF_SYSTEM);
 
  AddGRFTextToList(_cur.grfconfig->name, 0x7F, grfid, false, name);
 
  if (buf->HasData()) {
    const char *info = buf->ReadString();
    AddGRFTextToList(_cur.grfconfig->info, 0x7F, grfid, true, info);
  }
 
  /* GLS_INFOSCAN only looks for the action 8, so we can skip the rest of the file */
  _cur.skip_sprites = -1;
}
 
/* Action 0x08 */
static void GRFInfo(ByteReader *buf)
{
  /* <08> <version> <grf-id> <name> <info>
   *
   * B version       newgrf version, currently 06
   * 4*B grf-id      globally unique ID of this .grf file
   * S name          name of this .grf set
   * S info          string describing the set, and e.g. author and copyright */
 
  uint8 version    = buf->ReadByte();
  uint32 grfid     = buf->ReadDWord();
  const char *name = buf->ReadString();
 
  if (_cur.stage < GLS_RESERVE && _cur.grfconfig->status != GCS_UNKNOWN) {
    DisableGrf(STR_NEWGRF_ERROR_MULTIPLE_ACTION_8);
    return;
  }
 
  if (_cur.grffile->grfid != grfid) {
    Debug(grf, 0, "GRFInfo: GRFID {:08X} in FILESCAN stage does not match GRFID {:08X} in INIT/RESERVE/ACTIVATION stage", BSWAP32(_cur.grffile->grfid), BSWAP32(grfid));
    _cur.grffile->grfid = grfid;
  }
 
  _cur.grffile->grf_version = version;
  _cur.grfconfig->status = _cur.stage < GLS_RESERVE ? GCS_INITIALISED : GCS_ACTIVATED;
 
  /* Do swap the GRFID for displaying purposes since people expect that */
  Debug(grf, 1, "GRFInfo: Loaded GRFv{} set {:08X} - {} (palette: {}, version: {})", version, BSWAP32(grfid), name, (_cur.grfconfig->palette & GRFP_USE_MASK) ? "Windows" : "DOS", _cur.grfconfig->version);
}
 
/* Action 0x0A */
static void SpriteReplace(ByteReader *buf)
{
  /* <0A> <num-sets> <set1> [<set2> ...]
   * <set>: <num-sprites> <first-sprite>
   *
   * B num-sets      How many sets of sprites to replace.
   * Each set:
   * B num-sprites   How many sprites are in this set
   * W first-sprite  First sprite number to replace */
 
  uint8 num_sets = buf->ReadByte();
 
  for (uint i = 0; i < num_sets; i++) {
    uint8 num_sprites = buf->ReadByte();
    uint16 first_sprite = buf->ReadWord();
 
    grfmsg(2, "SpriteReplace: [Set %d] Changing %d sprites, beginning with %d",
      i, num_sprites, first_sprite
    );
 
    for (uint j = 0; j < num_sprites; j++) {
      int load_index = first_sprite + j;
      _cur.nfo_line++;
      LoadNextSprite(load_index, *_cur.file, _cur.nfo_line); // XXX
 
      /* Shore sprites now located at different addresses.
       * So detect when the old ones get replaced. */
      if (IsInsideMM(load_index, SPR_ORIGINALSHORE_START, SPR_ORIGINALSHORE_END + 1)) {
        if (_loaded_newgrf_features.shore != SHORE_REPLACE_ACTION_5) _loaded_newgrf_features.shore = SHORE_REPLACE_ACTION_A;
      }
    }
  }
}
 
/* Action 0x0A (SKIP) */
static void SkipActA(ByteReader *buf)
{
  uint8 num_sets = buf->ReadByte();
 
  for (uint i = 0; i < num_sets; i++) {
    /* Skip the sprites this replaces */
    _cur.skip_sprites += buf->ReadByte();
    /* But ignore where they go */
    buf->ReadWord();
  }
 
  grfmsg(3, "SkipActA: Skipping %d sprites", _cur.skip_sprites);
}
 
/* Action 0x0B */
static void GRFLoadError(ByteReader *buf)
{
  /* <0B> <severity> <language-id> <message-id> [<message...> 00] [<data...>] 00 [<parnum>]
   *
   * B severity      00: notice, continue loading grf file
   *                 01: warning, continue loading grf file
   *                 02: error, but continue loading grf file, and attempt
   *                     loading grf again when loading or starting next game
   *                 03: error, abort loading and prevent loading again in
   *                     the future (only when restarting the patch)
   * B language-id   see action 4, use 1F for built-in error messages
   * B message-id    message to show, see below
   * S message       for custom messages (message-id FF), text of the message
   *                 not present for built-in messages.
   * V data          additional data for built-in (or custom) messages
   * B parnum        parameter numbers to be shown in the message (maximum of 2) */
 
  static const StringID msgstr[] = {
    STR_NEWGRF_ERROR_VERSION_NUMBER,
    STR_NEWGRF_ERROR_DOS_OR_WINDOWS,
    STR_NEWGRF_ERROR_UNSET_SWITCH,
    STR_NEWGRF_ERROR_INVALID_PARAMETER,
    STR_NEWGRF_ERROR_LOAD_BEFORE,
    STR_NEWGRF_ERROR_LOAD_AFTER,
    STR_NEWGRF_ERROR_OTTD_VERSION_NUMBER,
  };
 
  static const StringID sevstr[] = {
    STR_NEWGRF_ERROR_MSG_INFO,
    STR_NEWGRF_ERROR_MSG_WARNING,
    STR_NEWGRF_ERROR_MSG_ERROR,
    STR_NEWGRF_ERROR_MSG_FATAL
  };
 
  byte severity   = buf->ReadByte();
  byte lang       = buf->ReadByte();
  byte message_id = buf->ReadByte();
 
  /* Skip the error if it isn't valid for the current language. */
  if (!CheckGrfLangID(lang, _cur.grffile->grf_version)) return;
 
  /* Skip the error until the activation stage unless bit 7 of the severity
   * is set. */
  if (!HasBit(severity, 7) && _cur.stage == GLS_INIT) {
    grfmsg(7, "GRFLoadError: Skipping non-fatal GRFLoadError in stage %d", _cur.stage);
    return;
  }
  ClrBit(severity, 7);
 
  if (severity >= lengthof(sevstr)) {
    grfmsg(7, "GRFLoadError: Invalid severity id %d. Setting to 2 (non-fatal error).", severity);
    severity = 2;
  } else if (severity == 3) {
    /* This is a fatal error, so make sure the GRF is deactivated and no
     * more of it gets loaded. */
    DisableGrf();
 
    /* Make sure we show fatal errors, instead of silly infos from before */
    delete _cur.grfconfig->error;
    _cur.grfconfig->error = nullptr;
  }
 
  if (message_id >= lengthof(msgstr) && message_id != 0xFF) {
    grfmsg(7, "GRFLoadError: Invalid message id.");
    return;
  }
 
  if (buf->Remaining() <= 1) {
    grfmsg(7, "GRFLoadError: No message data supplied.");
    return;
  }
 
  /* For now we can only show one message per newgrf file. */
  if (_cur.grfconfig->error != nullptr) return;
 
  GRFError *error = new GRFError(sevstr[severity]);
 
  if (message_id == 0xFF) {
    /* This is a custom error message. */
    if (buf->HasData()) {
      const char *message = buf->ReadString();
 
      error->custom_message = TranslateTTDPatchCodes(_cur.grffile->grfid, lang, true, message, SCC_RAW_STRING_POINTER);
    } else {
      grfmsg(7, "GRFLoadError: No custom message supplied.");
      error->custom_message.clear();
    }
  } else {
    error->message = msgstr[message_id];
  }
 
  if (buf->HasData()) {
    const char *data = buf->ReadString();
 
    error->data = TranslateTTDPatchCodes(_cur.grffile->grfid, lang, true, data);
  } else {
    grfmsg(7, "GRFLoadError: No message data supplied.");
    error->data.clear();
  }
 
  /* Only two parameter numbers can be used in the string. */
  for (uint i = 0; i < lengthof(error->param_value) && buf->HasData(); i++) {
    uint param_number = buf->ReadByte();
    error->param_value[i] = _cur.grffile->GetParam(param_number);
  }
 
  _cur.grfconfig->error = error;
}
 
/* Action 0x0C */
static void GRFComment(ByteReader *buf)
{
  /* <0C> [<ignored...>]
   *
   * V ignored       Anything following the 0C is ignored */
 
  if (!buf->HasData()) return;
 
  const char *text = buf->ReadString();
  grfmsg(2, "GRFComment: %s", text);
}
 
/* Action 0x0D (GLS_SAFETYSCAN) */
static void SafeParamSet(ByteReader *buf)
{
  uint8 target = buf->ReadByte();
 
  /* Writing GRF parameters and some bits of 'misc GRF features' are safe. */
  if (target < 0x80 || target == 0x9E) return;
 
  /* GRM could be unsafe, but as here it can only happen after other GRFs
   * are loaded, it should be okay. If the GRF tried to use the slots it
   * reserved, it would be marked unsafe anyway. GRM for (e.g. bridge)
   * sprites  is considered safe. */
 
  SetBit(_cur.grfconfig->flags, GCF_UNSAFE);
 
  /* Skip remainder of GRF */
  _cur.skip_sprites = -1;
}
 
 
static uint32 GetPatchVariable(uint8 param)
{
  switch (param) {
    /* start year - 1920 */
    case 0x0B: return std::max(_settings_game.game_creation.starting_year, ORIGINAL_BASE_YEAR) - ORIGINAL_BASE_YEAR;
 
    /* freight trains weight factor */
    case 0x0E: return _settings_game.vehicle.freight_trains;
 
    /* empty wagon speed increase */
    case 0x0F: return 0;
 
    /* plane speed factor; our patch option is reversed from TTDPatch's,
     * the following is good for 1x, 2x and 4x (most common?) and...
     * well not really for 3x. */
    case 0x10:
      switch (_settings_game.vehicle.plane_speed) {
        default:
        case 4: return 1;
        case 3: return 2;
        case 2: return 2;
        case 1: return 4;
      }
 
 
    /* 2CC colourmap base sprite */
    case 0x11: return SPR_2CCMAP_BASE;
 
    /* map size: format = -MABXYSS
     * M  : the type of map
     *       bit 0 : set   : squared map. Bit 1 is now not relevant
     *               clear : rectangle map. Bit 1 will indicate the bigger edge of the map
     *       bit 1 : set   : Y is the bigger edge. Bit 0 is clear
     *               clear : X is the bigger edge.
     * A  : minimum edge(log2) of the map
     * B  : maximum edge(log2) of the map
     * XY : edges(log2) of each side of the map.
     * SS : combination of both X and Y, thus giving the size(log2) of the map
     */
    case 0x13: {
      byte map_bits = 0;
      byte log_X = MapLogX() - 6; // subtraction is required to make the minimal size (64) zero based
      byte log_Y = MapLogY() - 6;
      byte max_edge = std::max(log_X, log_Y);
 
      if (log_X == log_Y) { // we have a squared map, since both edges are identical
        SetBit(map_bits, 0);
      } else {
        if (max_edge == log_Y) SetBit(map_bits, 1); // edge Y been the biggest, mark it
      }
 
      return (map_bits << 24) | (std::min(log_X, log_Y) << 20) | (max_edge << 16) |
        (log_X << 12) | (log_Y << 8) | (log_X + log_Y);
    }
 
    /* The maximum height of the map. */
    case 0x14:
      return _settings_game.construction.map_height_limit;
 
    /* Extra foundations base sprite */
    case 0x15:
      return SPR_SLOPES_BASE;
 
    /* Shore base sprite */
    case 0x16:
      return SPR_SHORE_BASE;
 
    /* Game map seed */
    case 0x17:
      return _settings_game.game_creation.generation_seed;
 
    default:
      grfmsg(2, "ParamSet: Unknown Patch variable 0x%02X.", param);
      return 0;
  }
}
 
 
static uint32 PerformGRM(uint32 *grm, uint16 num_ids, uint16 count, uint8 op, uint8 target, const char *type)
{
  uint start = 0;
  uint size  = 0;
 
  if (op == 6) {
    /* Return GRFID of set that reserved ID */
    return grm[_cur.grffile->GetParam(target)];
  }
 
  /* With an operation of 2 or 3, we want to reserve a specific block of IDs */
  if (op == 2 || op == 3) start = _cur.grffile->GetParam(target);
 
  for (uint i = start; i < num_ids; i++) {
    if (grm[i] == 0) {
      size++;
    } else {
      if (op == 2 || op == 3) break;
      start = i + 1;
      size = 0;
    }
 
    if (size == count) break;
  }
 
  if (size == count) {
    /* Got the slot... */
    if (op == 0 || op == 3) {
      grfmsg(2, "ParamSet: GRM: Reserving %d %s at %d", count, type, start);
      for (uint i = 0; i < count; i++) grm[start + i] = _cur.grffile->grfid;
    }
    return start;
  }
 
  /* Unable to allocate */
  if (op != 4 && op != 5) {
    /* Deactivate GRF */
    grfmsg(0, "ParamSet: GRM: Unable to allocate %d %s, deactivating", count, type);
    DisableGrf(STR_NEWGRF_ERROR_GRM_FAILED);
    return UINT_MAX;
  }
 
  grfmsg(1, "ParamSet: GRM: Unable to allocate %d %s", count, type);
  return UINT_MAX;
}
 
 
static void ParamSet(ByteReader *buf)
{
  /* <0D> <target> <operation> <source1> <source2> [<data>]
   *
   * B target        parameter number where result is stored
   * B operation     operation to perform, see below
   * B source1       first source operand
   * B source2       second source operand
   * D data          data to use in the calculation, not necessary
   *                 if both source1 and source2 refer to actual parameters
   *
   * Operations
   * 00      Set parameter equal to source1
   * 01      Addition, source1 + source2
   * 02      Subtraction, source1 - source2
   * 03      Unsigned multiplication, source1 * source2 (both unsigned)
   * 04      Signed multiplication, source1 * source2 (both signed)
   * 05      Unsigned bit shift, source1 by source2 (source2 taken to be a
   *         signed quantity; left shift if positive and right shift if
   *         negative, source1 is unsigned)
   * 06      Signed bit shift, source1 by source2
   *         (source2 like in 05, and source1 as well)
   */
 
  uint8 target = buf->ReadByte();
  uint8 oper   = buf->ReadByte();
  uint32 src1  = buf->ReadByte();
  uint32 src2  = buf->ReadByte();
 
  uint32 data = 0;
  if (buf->Remaining() >= 4) data = buf->ReadDWord();
 
  /* You can add 80 to the operation to make it apply only if the target
   * is not defined yet.  In this respect, a parameter is taken to be
   * defined if any of the following applies:
   * - it has been set to any value in the newgrf(w).cfg parameter list
   * - it OR A PARAMETER WITH HIGHER NUMBER has been set to any value by
   *   an earlier action D */
  if (HasBit(oper, 7)) {
    if (target < 0x80 && target < _cur.grffile->param_end) {
      grfmsg(7, "ParamSet: Param %u already defined, skipping", target);
      return;
    }
 
    oper = GB(oper, 0, 7);
  }
 
  if (src2 == 0xFE) {
    if (GB(data, 0, 8) == 0xFF) {
      if (data == 0x0000FFFF) {
        /* Patch variables */
        src1 = GetPatchVariable(src1);
      } else {
        /* GRF Resource Management */
        uint8  op      = src1;
        uint8  feature = GB(data, 8, 8);
        uint16 count   = GB(data, 16, 16);
 
        if (_cur.stage == GLS_RESERVE) {
          if (feature == 0x08) {
            /* General sprites */
            if (op == 0) {
              /* Check if the allocated sprites will fit below the original sprite limit */
              if (_cur.spriteid + count >= 16384) {
                grfmsg(0, "ParamSet: GRM: Unable to allocate %d sprites; try changing NewGRF order", count);
                DisableGrf(STR_NEWGRF_ERROR_GRM_FAILED);
                return;
              }
 
              /* Reserve space at the current sprite ID */
              grfmsg(4, "ParamSet: GRM: Allocated %d sprites at %d", count, _cur.spriteid);
              _grm_sprites[GRFLocation(_cur.grffile->grfid, _cur.nfo_line)] = _cur.spriteid;
              _cur.spriteid += count;
            }
          }
          /* Ignore GRM result during reservation */
          src1 = 0;
        } else if (_cur.stage == GLS_ACTIVATION) {
          switch (feature) {
            case 0x00: // Trains
            case 0x01: // Road Vehicles
            case 0x02: // Ships
            case 0x03: // Aircraft
              if (!_settings_game.vehicle.dynamic_engines) {
                src1 = PerformGRM(&_grm_engines[_engine_offsets[feature]], _engine_counts[feature], count, op, target, "vehicles");
                if (_cur.skip_sprites == -1) return;
              } else {
                /* GRM does not apply for dynamic engine allocation. */
                switch (op) {
                  case 2:
                  case 3:
                    src1 = _cur.grffile->GetParam(target);
                    break;
 
                  default:
                    src1 = 0;
                    break;
                }
              }
              break;
 
            case 0x08: // General sprites
              switch (op) {
                case 0:
                  /* Return space reserved during reservation stage */
                  src1 = _grm_sprites[GRFLocation(_cur.grffile->grfid, _cur.nfo_line)];
                  grfmsg(4, "ParamSet: GRM: Using pre-allocated sprites at %d", src1);
                  break;
 
                case 1:
                  src1 = _cur.spriteid;
                  break;
 
                default:
                  grfmsg(1, "ParamSet: GRM: Unsupported operation %d for general sprites", op);
                  return;
              }
              break;
 
            case 0x0B: // Cargo
              /* There are two ranges: one for cargo IDs and one for cargo bitmasks */
              src1 = PerformGRM(_grm_cargoes, NUM_CARGO * 2, count, op, target, "cargoes");
              if (_cur.skip_sprites == -1) return;
              break;
 
            default: grfmsg(1, "ParamSet: GRM: Unsupported feature 0x%X", feature); return;
          }
        } else {
          /* Ignore GRM during initialization */
          src1 = 0;
        }
      }
    } else {
      /* Read another GRF File's parameter */
      const GRFFile *file = GetFileByGRFID(data);
      GRFConfig *c = GetGRFConfig(data);
      if (c != nullptr && HasBit(c->flags, GCF_STATIC) && !HasBit(_cur.grfconfig->flags, GCF_STATIC) && _networking) {
        /* Disable the read GRF if it is a static NewGRF. */
        DisableStaticNewGRFInfluencingNonStaticNewGRFs(c);
        src1 = 0;
      } else if (file == nullptr || c == nullptr || c->status == GCS_DISABLED) {
        src1 = 0;
      } else if (src1 == 0xFE) {
        src1 = c->version;
      } else {
        src1 = file->GetParam(src1);
      }
    }
  } else {
    /* The source1 and source2 operands refer to the grf parameter number
     * like in action 6 and 7.  In addition, they can refer to the special
     * variables available in action 7, or they can be FF to use the value
     * of <data>.  If referring to parameters that are undefined, a value
     * of 0 is used instead.  */
    src1 = (src1 == 0xFF) ? data : GetParamVal(src1, nullptr);
    src2 = (src2 == 0xFF) ? data : GetParamVal(src2, nullptr);
  }
 
  uint32 res;
  switch (oper) {
    case 0x00:
      res = src1;
      break;
 
    case 0x01:
      res = src1 + src2;
      break;
 
    case 0x02:
      res = src1 - src2;
      break;
 
    case 0x03:
      res = src1 * src2;
      break;
 
    case 0x04:
      res = (int32)src1 * (int32)src2;
      break;
 
    case 0x05:
      if ((int32)src2 < 0) {
        res = src1 >> -(int32)src2;
      } else {
        res = src1 << (src2 & 0x1F); // Same behaviour as in EvalAdjustT, mask 'value' to 5 bits, which should behave the same on all architectures.
      }
      break;
 
    case 0x06:
      if ((int32)src2 < 0) {
        res = (int32)src1 >> -(int32)src2;
      } else {
        res = (int32)src1 << (src2 & 0x1F); // Same behaviour as in EvalAdjustT, mask 'value' to 5 bits, which should behave the same on all architectures.
      }
      break;
 
    case 0x07: // Bitwise AND
      res = src1 & src2;
      break;
 
    case 0x08: // Bitwise OR
      res = src1 | src2;
      break;
 
    case 0x09: // Unsigned division
      if (src2 == 0) {
        res = src1;
      } else {
        res = src1 / src2;
      }
      break;
 
    case 0x0A: // Signed division
      if (src2 == 0) {
        res = src1;
      } else {
        res = (int32)src1 / (int32)src2;
      }
      break;
 
    case 0x0B: // Unsigned modulo
      if (src2 == 0) {
        res = src1;
      } else {
        res = src1 % src2;
      }
      break;
 
    case 0x0C: // Signed modulo
      if (src2 == 0) {
        res = src1;
      } else {
        res = (int32)src1 % (int32)src2;
      }
      break;
 
    default: grfmsg(0, "ParamSet: Unknown operation %d, skipping", oper); return;
  }
 
  switch (target) {
    case 0x8E: // Y-Offset for train sprites
      _cur.grffile->traininfo_vehicle_pitch = res;
      break;
 
    case 0x8F: { // Rail track type cost factors
      extern RailtypeInfo _railtypes[RAILTYPE_END];
      _railtypes[RAILTYPE_RAIL].cost_multiplier = GB(res, 0, 8);
      if (_settings_game.vehicle.disable_elrails) {
        _railtypes[RAILTYPE_ELECTRIC].cost_multiplier = GB(res, 0, 8);
        _railtypes[RAILTYPE_MONO].cost_multiplier = GB(res, 8, 8);
      } else {
        _railtypes[RAILTYPE_ELECTRIC].cost_multiplier = GB(res, 8, 8);
        _railtypes[RAILTYPE_MONO].cost_multiplier = GB(res, 16, 8);
      }
      _railtypes[RAILTYPE_MAGLEV].cost_multiplier = GB(res, 16, 8);
      break;
    }
 
    /* not implemented */
    case 0x93: // Tile refresh offset to left -- Intended to allow support for larger sprites, not necessary for OTTD
    case 0x94: // Tile refresh offset to right
    case 0x95: // Tile refresh offset upwards
    case 0x96: // Tile refresh offset downwards
    case 0x97: // Snow line height -- Better supported by feature 8 property 10h (snow line table) TODO: implement by filling the entire snow line table with the given value
    case 0x99: // Global ID offset -- Not necessary since IDs are remapped automatically
      grfmsg(7, "ParamSet: Skipping unimplemented target 0x%02X", target);
      break;
 
    case 0x9E: // Miscellaneous GRF features
      /* Set train list engine width */
      _cur.grffile->traininfo_vehicle_width = HasBit(res, GMB_TRAIN_WIDTH_32_PIXELS) ? VEHICLEINFO_FULL_VEHICLE_WIDTH : TRAININFO_DEFAULT_VEHICLE_WIDTH;
      /* Remove the local flags from the global flags */
      ClrBit(res, GMB_TRAIN_WIDTH_32_PIXELS);
 
      /* Only copy safe bits for static grfs */
      if (HasBit(_cur.grfconfig->flags, GCF_STATIC)) {
        uint32 safe_bits = 0;
        SetBit(safe_bits, GMB_SECOND_ROCKY_TILE_SET);
 
        _misc_grf_features = (_misc_grf_features & ~safe_bits) | (res & safe_bits);
      } else {
        _misc_grf_features = res;
      }
      break;
 
    case 0x9F: // locale-dependent settings
      grfmsg(7, "ParamSet: Skipping unimplemented target 0x%02X", target);
      break;
 
    default:
      if (target < 0x80) {
        _cur.grffile->param[target] = res;
        /* param is zeroed by default */
        if (target + 1U > _cur.grffile->param_end) _cur.grffile->param_end = target + 1;
      } else {
        grfmsg(7, "ParamSet: Skipping unknown target 0x%02X", target);
      }
      break;
  }
}
 
/* Action 0x0E (GLS_SAFETYSCAN) */
static void SafeGRFInhibit(ByteReader *buf)
{
  /* <0E> <num> <grfids...>
   *
   * B num           Number of GRFIDs that follow
   * D grfids        GRFIDs of the files to deactivate */
 
  uint8 num = buf->ReadByte();
 
  for (uint i = 0; i < num; i++) {
    uint32 grfid = buf->ReadDWord();
 
    /* GRF is unsafe it if tries to deactivate other GRFs */
    if (grfid != _cur.grfconfig->ident.grfid) {
      SetBit(_cur.grfconfig->flags, GCF_UNSAFE);
 
      /* Skip remainder of GRF */
      _cur.skip_sprites = -1;
 
      return;
    }
  }
}
 
/* Action 0x0E */
static void GRFInhibit(ByteReader *buf)
{
  /* <0E> <num> <grfids...>
   *
   * B num           Number of GRFIDs that follow
   * D grfids        GRFIDs of the files to deactivate */
 
  uint8 num = buf->ReadByte();
 
  for (uint i = 0; i < num; i++) {
    uint32 grfid = buf->ReadDWord();
    GRFConfig *file = GetGRFConfig(grfid);
 
    /* Unset activation flag */
    if (file != nullptr && file != _cur.grfconfig) {
      grfmsg(2, "GRFInhibit: Deactivating file '%s'", file->filename);
      GRFError *error = DisableGrf(STR_NEWGRF_ERROR_FORCEFULLY_DISABLED, file);
      error->data = _cur.grfconfig->GetName();
    }
  }
}
 
static void FeatureTownName(ByteReader *buf)
{
  /* <0F> <id> <style-name> <num-parts> <parts>
   *
   * B id          ID of this definition in bottom 7 bits (final definition if bit 7 set)
   * V style-name  Name of the style (only for final definition)
   * B num-parts   Number of parts in this definition
   * V parts       The parts */
 
  uint32 grfid = _cur.grffile->grfid;
 
  GRFTownName *townname = AddGRFTownName(grfid);
 
  byte id = buf->ReadByte();
  grfmsg(6, "FeatureTownName: definition 0x%02X", id & 0x7F);
 
  if (HasBit(id, 7)) {
    /* Final definition */
    ClrBit(id, 7);
    bool new_scheme = _cur.grffile->grf_version >= 7;
 
    byte lang = buf->ReadByte();
 
    byte nb_gen = townname->nb_gen;
    do {
      ClrBit(lang, 7);
 
      const char *name = buf->ReadString();
 
      std::string lang_name = TranslateTTDPatchCodes(grfid, lang, false, name);
      grfmsg(6, "FeatureTownName: lang 0x%X -> '%s'", lang, lang_name.c_str());
 
      townname->name[nb_gen] = AddGRFString(grfid, id, lang, new_scheme, false, name, STR_UNDEFINED);
 
      lang = buf->ReadByte();
    } while (lang != 0);
    townname->id[nb_gen] = id;
    townname->nb_gen++;
  }
 
  byte nb = buf->ReadByte();
  grfmsg(6, "FeatureTownName: %u parts", nb);
 
  townname->nbparts[id] = nb;
  townname->partlist[id] = CallocT<NamePartList>(nb);
 
  for (int i = 0; i < nb; i++) {
    byte nbtext =  buf->ReadByte();
    townname->partlist[id][i].bitstart  = buf->ReadByte();
    townname->partlist[id][i].bitcount  = buf->ReadByte();
    townname->partlist[id][i].maxprob   = 0;
    townname->partlist[id][i].partcount = nbtext;
    townname->partlist[id][i].parts     = CallocT<NamePart>(nbtext);
    grfmsg(6, "FeatureTownName: part %d contains %d texts and will use GB(seed, %d, %d)", i, nbtext, townname->partlist[id][i].bitstart, townname->partlist[id][i].bitcount);
 
    for (int j = 0; j < nbtext; j++) {
      byte prob = buf->ReadByte();
 
      if (HasBit(prob, 7)) {
        byte ref_id = buf->ReadByte();
 
        if (townname->nbparts[ref_id] == 0) {
          grfmsg(0, "FeatureTownName: definition 0x%02X doesn't exist, deactivating", ref_id);
          DelGRFTownName(grfid);
          DisableGrf(STR_NEWGRF_ERROR_INVALID_ID);
          return;
        }
 
        grfmsg(6, "FeatureTownName: part %d, text %d, uses intermediate definition 0x%02X (with probability %d)", i, j, ref_id, prob & 0x7F);
        townname->partlist[id][i].parts[j].data.id = ref_id;
      } else {
        const char *text = buf->ReadString();
        townname->partlist[id][i].parts[j].data.text = stredup(TranslateTTDPatchCodes(grfid, 0, false, text).c_str());
        grfmsg(6, "FeatureTownName: part %d, text %d, '%s' (with probability %d)", i, j, townname->partlist[id][i].parts[j].data.text, prob);
      }
      townname->partlist[id][i].parts[j].prob = prob;
      townname->partlist[id][i].maxprob += GB(prob, 0, 7);
    }
    grfmsg(6, "FeatureTownName: part %d, total probability %d", i, townname->partlist[id][i].maxprob);
  }
}
 
static void DefineGotoLabel(ByteReader *buf)
{
  /* <10> <label> [<comment>]
   *
   * B label      The label to define
   * V comment    Optional comment - ignored */
 
  byte nfo_label = buf->ReadByte();
 
  _cur.grffile->labels.emplace_back(nfo_label, _cur.nfo_line, _cur.file->GetPos());
 
  grfmsg(2, "DefineGotoLabel: GOTO target with label 0x%02X", nfo_label);
}
 
static void ImportGRFSound(SoundEntry *sound)
{
  const GRFFile *file;
  uint32 grfid = _cur.file->ReadDword();
  SoundID sound_id = _cur.file->ReadWord();
 
  file = GetFileByGRFID(grfid);
  if (file == nullptr || file->sound_offset == 0) {
    grfmsg(1, "ImportGRFSound: Source file not available");
    return;
  }
 
  if (sound_id >= file->num_sounds) {
    grfmsg(1, "ImportGRFSound: Sound effect %d is invalid", sound_id);
    return;
  }
 
  grfmsg(2, "ImportGRFSound: Copying sound %d (%d) from file %X", sound_id, file->sound_offset + sound_id, grfid);
 
  *sound = *GetSound(file->sound_offset + sound_id);
 
  /* Reset volume and priority, which TTDPatch doesn't copy */
  sound->volume   = 128;
  sound->priority = 0;
}
 
static void LoadGRFSound(size_t offs, SoundEntry *sound)
{
  /* Set default volume and priority */
  sound->volume = 0x80;
  sound->priority = 0;
 
  if (offs != SIZE_MAX) {
    /* Sound is present in the NewGRF. */
    sound->file = _cur.file;
    sound->file_offset = offs;
    sound->grf_container_ver = _cur.file->GetContainerVersion();
  }
}
 
/* Action 0x11 */
static void GRFSound(ByteReader *buf)
{
  /* <11> <num>
   *
   * W num      Number of sound files that follow */
 
  uint16 num = buf->ReadWord();
  if (num == 0) return;
 
  SoundEntry *sound;
  if (_cur.grffile->sound_offset == 0) {
    _cur.grffile->sound_offset = GetNumSounds();
    _cur.grffile->num_sounds = num;
    sound = AllocateSound(num);
  } else {
    sound = GetSound(_cur.grffile->sound_offset);
  }
 
  SpriteFile &file = *_cur.file;
  byte grf_container_version = file.GetContainerVersion();
  for (int i = 0; i < num; i++) {
    _cur.nfo_line++;
 
    /* Check whether the index is in range. This might happen if multiple action 11 are present.
     * While this is invalid, we do not check for this. But we should prevent it from causing bigger trouble */
    bool invalid = i >= _cur.grffile->num_sounds;
 
    size_t offs = file.GetPos();
 
    uint32 len = grf_container_version >= 2 ? file.ReadDword() : file.ReadWord();
    byte type = file.ReadByte();
 
    if (grf_container_version >= 2 && type == 0xFD) {
      /* Reference to sprite section. */
      if (invalid) {
        grfmsg(1, "GRFSound: Sound index out of range (multiple Action 11?)");
        file.SkipBytes(len);
      } else if (len != 4) {
        grfmsg(1, "GRFSound: Invalid sprite section import");
        file.SkipBytes(len);
      } else {
        uint32 id = file.ReadDword();
        if (_cur.stage == GLS_INIT) LoadGRFSound(GetGRFSpriteOffset(id), sound + i);
      }
      continue;
    }
 
    if (type != 0xFF) {
      grfmsg(1, "GRFSound: Unexpected RealSprite found, skipping");
      file.SkipBytes(7);
      SkipSpriteData(*_cur.file, type, len - 8);
      continue;
    }
 
    if (invalid) {
      grfmsg(1, "GRFSound: Sound index out of range (multiple Action 11?)");
      file.SkipBytes(len);
    }
 
    byte action = file.ReadByte();
    switch (action) {
      case 0xFF:
        /* Allocate sound only in init stage. */
        if (_cur.stage == GLS_INIT) {
          if (grf_container_version >= 2) {
            grfmsg(1, "GRFSound: Inline sounds are not supported for container version >= 2");
          } else {
            LoadGRFSound(offs, sound + i);
          }
        }
        file.SkipBytes(len - 1); // already read <action>
        break;
 
      case 0xFE:
        if (_cur.stage == GLS_ACTIVATION) {
          /* XXX 'Action 0xFE' isn't really specified. It is only mentioned for
           * importing sounds, so this is probably all wrong... */
          if (file.ReadByte() != 0) grfmsg(1, "GRFSound: Import type mismatch");
          ImportGRFSound(sound + i);
        } else {
          file.SkipBytes(len - 1); // already read <action>
        }
        break;
 
      default:
        grfmsg(1, "GRFSound: Unexpected Action %x found, skipping", action);
        file.SkipBytes(len - 1); // already read <action>
        break;
    }
  }
}
 
/* Action 0x11 (SKIP) */
static void SkipAct11(ByteReader *buf)
{
  /* <11> <num>
   *
   * W num      Number of sound files that follow */
 
  _cur.skip_sprites = buf->ReadWord();
 
  grfmsg(3, "SkipAct11: Skipping %d sprites", _cur.skip_sprites);
}
 
static void LoadFontGlyph(ByteReader *buf)
{
  /* <12> <num_def> <font_size> <num_char> <base_char>
   *
   * B num_def      Number of definitions
   * B font_size    Size of font (0 = normal, 1 = small, 2 = large, 3 = mono)
   * B num_char     Number of consecutive glyphs
   * W base_char    First character index */
 
  uint8 num_def = buf->ReadByte();
 
  for (uint i = 0; i < num_def; i++) {
    FontSize size    = (FontSize)buf->ReadByte();
    uint8  num_char  = buf->ReadByte();
    uint16 base_char = buf->ReadWord();
 
    if (size >= FS_END) {
      grfmsg(1, "LoadFontGlyph: Size %u is not supported, ignoring", size);
    }
 
    grfmsg(7, "LoadFontGlyph: Loading %u glyph(s) at 0x%04X for size %u", num_char, base_char, size);
 
    for (uint c = 0; c < num_char; c++) {
      if (size < FS_END) SetUnicodeGlyph(size, base_char + c, _cur.spriteid);
      _cur.nfo_line++;
      LoadNextSprite(_cur.spriteid++, *_cur.file, _cur.nfo_line);
    }
  }
}
 
static void SkipAct12(ByteReader *buf)
{
  /* <12> <num_def> <font_size> <num_char> <base_char>
   *
   * B num_def      Number of definitions
   * B font_size    Size of font (0 = normal, 1 = small, 2 = large)
   * B num_char     Number of consecutive glyphs
   * W base_char    First character index */
 
  uint8 num_def = buf->ReadByte();
 
  for (uint i = 0; i < num_def; i++) {
    /* Ignore 'size' byte */
    buf->ReadByte();
 
    /* Sum up number of characters */
    _cur.skip_sprites += buf->ReadByte();
 
    /* Ignore 'base_char' word */
    buf->ReadWord();
  }
 
  grfmsg(3, "SkipAct12: Skipping %d sprites", _cur.skip_sprites);
}
 
static void TranslateGRFStrings(ByteReader *buf)
{
  /* <13> <grfid> <num-ent> <offset> <text...>
   *
   * 4*B grfid     The GRFID of the file whose texts are to be translated
   * B   num-ent   Number of strings
   * W   offset    First text ID
   * S   text...   Zero-terminated strings */
 
  uint32 grfid = buf->ReadDWord();
  const GRFConfig *c = GetGRFConfig(grfid);
  if (c == nullptr || (c->status != GCS_INITIALISED && c->status != GCS_ACTIVATED)) {
    grfmsg(7, "TranslateGRFStrings: GRFID 0x%08x unknown, skipping action 13", BSWAP32(grfid));
    return;
  }
 
  if (c->status == GCS_INITIALISED) {
    /* If the file is not active but will be activated later, give an error
     * and disable this file. */
    GRFError *error = DisableGrf(STR_NEWGRF_ERROR_LOAD_AFTER);
 
    error->data = GetString(STR_NEWGRF_ERROR_AFTER_TRANSLATED_FILE);
 
    return;
  }
 
  /* Since no language id is supplied for with version 7 and lower NewGRFs, this string has
   * to be added as a generic string, thus the language id of 0x7F. For this to work
   * new_scheme has to be true as well, which will also be implicitly the case for version 8
   * and higher. A language id of 0x7F will be overridden by a non-generic id, so this will
   * not change anything if a string has been provided specifically for this language. */
  byte language = _cur.grffile->grf_version >= 8 ? buf->ReadByte() : 0x7F;
  byte num_strings = buf->ReadByte();
  uint16 first_id  = buf->ReadWord();
 
  if (!((first_id >= 0xD000 && first_id + num_strings <= 0xD400) || (first_id >= 0xD800 && first_id + num_strings <= 0xE000))) {
    grfmsg(7, "TranslateGRFStrings: Attempting to set out-of-range string IDs in action 13 (first: 0x%4X, number: 0x%2X)", first_id, num_strings);
    return;
  }
 
  for (uint i = 0; i < num_strings && buf->HasData(); i++) {
    const char *string = buf->ReadString();
 
    if (StrEmpty(string)) {
      grfmsg(7, "TranslateGRFString: Ignoring empty string.");
      continue;
    }
 
    AddGRFString(grfid, first_id + i, language, true, true, string, STR_UNDEFINED);
  }
}
 
static bool ChangeGRFName(byte langid, const char *str)
{
  AddGRFTextToList(_cur.grfconfig->name, langid, _cur.grfconfig->ident.grfid, false, str);
  return true;
}
 
static bool ChangeGRFDescription(byte langid, const char *str)
{
  AddGRFTextToList(_cur.grfconfig->info, langid, _cur.grfconfig->ident.grfid, true, str);
  return true;
}
 
static bool ChangeGRFURL(byte langid, const char *str)
{
  AddGRFTextToList(_cur.grfconfig->url, langid, _cur.grfconfig->ident.grfid, false, str);
  return true;
}
 
static bool ChangeGRFNumUsedParams(size_t len, ByteReader *buf)
{
  if (len != 1) {
    grfmsg(2, "StaticGRFInfo: expected only 1 byte for 'INFO'->'NPAR' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    _cur.grfconfig->num_valid_params = std::min<byte>(buf->ReadByte(), lengthof(_cur.grfconfig->param));
  }
  return true;
}
 
static bool ChangeGRFPalette(size_t len, ByteReader *buf)
{
  if (len != 1) {
    grfmsg(2, "StaticGRFInfo: expected only 1 byte for 'INFO'->'PALS' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    char data = buf->ReadByte();
    GRFPalette pal = GRFP_GRF_UNSET;
    switch (data) {
      case '*':
      case 'A': pal = GRFP_GRF_ANY;     break;
      case 'W': pal = GRFP_GRF_WINDOWS; break;
      case 'D': pal = GRFP_GRF_DOS;     break;
      default:
        grfmsg(2, "StaticGRFInfo: unexpected value '%02x' for 'INFO'->'PALS', ignoring this field", data);
        break;
    }
    if (pal != GRFP_GRF_UNSET) {
      _cur.grfconfig->palette &= ~GRFP_GRF_MASK;
      _cur.grfconfig->palette |= pal;
    }
  }
  return true;
}
 
static bool ChangeGRFBlitter(size_t len, ByteReader *buf)
{
  if (len != 1) {
    grfmsg(2, "StaticGRFInfo: expected only 1 byte for 'INFO'->'BLTR' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    char data = buf->ReadByte();
    GRFPalette pal = GRFP_BLT_UNSET;
    switch (data) {
      case '8': pal = GRFP_BLT_UNSET; break;
      case '3': pal = GRFP_BLT_32BPP;  break;
      default:
        grfmsg(2, "StaticGRFInfo: unexpected value '%02x' for 'INFO'->'BLTR', ignoring this field", data);
        return true;
    }
    _cur.grfconfig->palette &= ~GRFP_BLT_MASK;
    _cur.grfconfig->palette |= pal;
  }
  return true;
}
 
static bool ChangeGRFVersion(size_t len, ByteReader *buf)
{
  if (len != 4) {
    grfmsg(2, "StaticGRFInfo: expected 4 bytes for 'INFO'->'VRSN' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    /* Set min_loadable_version as well (default to minimal compatibility) */
    _cur.grfconfig->version = _cur.grfconfig->min_loadable_version = buf->ReadDWord();
  }
  return true;
}
 
static bool ChangeGRFMinVersion(size_t len, ByteReader *buf)
{
  if (len != 4) {
    grfmsg(2, "StaticGRFInfo: expected 4 bytes for 'INFO'->'MINV' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    _cur.grfconfig->min_loadable_version = buf->ReadDWord();
    if (_cur.grfconfig->version == 0) {
      grfmsg(2, "StaticGRFInfo: 'MINV' defined before 'VRSN' or 'VRSN' set to 0, ignoring this field");
      _cur.grfconfig->min_loadable_version = 0;
    }
    if (_cur.grfconfig->version < _cur.grfconfig->min_loadable_version) {
      grfmsg(2, "StaticGRFInfo: 'MINV' defined as %d, limiting it to 'VRSN'", _cur.grfconfig->min_loadable_version);
      _cur.grfconfig->min_loadable_version = _cur.grfconfig->version;
    }
  }
  return true;
}
 
static GRFParameterInfo *_cur_parameter; 
 
static bool ChangeGRFParamName(byte langid, const char *str)
{
  AddGRFTextToList(_cur_parameter->name, langid, _cur.grfconfig->ident.grfid, false, str);
  return true;
}
 
static bool ChangeGRFParamDescription(byte langid, const char *str)
{
  AddGRFTextToList(_cur_parameter->desc, langid, _cur.grfconfig->ident.grfid, true, str);
  return true;
}
 
static bool ChangeGRFParamType(size_t len, ByteReader *buf)
{
  if (len != 1) {
    grfmsg(2, "StaticGRFInfo: expected 1 byte for 'INFO'->'PARA'->'TYPE' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    GRFParameterType type = (GRFParameterType)buf->ReadByte();
    if (type < PTYPE_END) {
      _cur_parameter->type = type;
    } else {
      grfmsg(3, "StaticGRFInfo: unknown parameter type %d, ignoring this field", type);
    }
  }
  return true;
}
 
static bool ChangeGRFParamLimits(size_t len, ByteReader *buf)
{
  if (_cur_parameter->type != PTYPE_UINT_ENUM) {
    grfmsg(2, "StaticGRFInfo: 'INFO'->'PARA'->'LIMI' is only valid for parameters with type uint/enum, ignoring this field");
    buf->Skip(len);
  } else if (len != 8) {
    grfmsg(2, "StaticGRFInfo: expected 8 bytes for 'INFO'->'PARA'->'LIMI' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    uint32 min_value = buf->ReadDWord();
    uint32 max_value = buf->ReadDWord();
    if (min_value <= max_value) {
      _cur_parameter->min_value = min_value;
      _cur_parameter->max_value = max_value;
    } else {
      grfmsg(2, "StaticGRFInfo: 'INFO'->'PARA'->'LIMI' values are incoherent, ignoring this field");
    }
  }
  return true;
}
 
static bool ChangeGRFParamMask(size_t len, ByteReader *buf)
{
  if (len < 1 || len > 3) {
    grfmsg(2, "StaticGRFInfo: expected 1 to 3 bytes for 'INFO'->'PARA'->'MASK' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    byte param_nr = buf->ReadByte();
    if (param_nr >= lengthof(_cur.grfconfig->param)) {
      grfmsg(2, "StaticGRFInfo: invalid parameter number in 'INFO'->'PARA'->'MASK', param %d, ignoring this field", param_nr);
      buf->Skip(len - 1);
    } else {
      _cur_parameter->param_nr = param_nr;
      if (len >= 2) _cur_parameter->first_bit = std::min<byte>(buf->ReadByte(), 31);
      if (len >= 3) _cur_parameter->num_bit = std::min<byte>(buf->ReadByte(), 32 - _cur_parameter->first_bit);
    }
  }
 
  return true;
}
 
static bool ChangeGRFParamDefault(size_t len, ByteReader *buf)
{
  if (len != 4) {
    grfmsg(2, "StaticGRFInfo: expected 4 bytes for 'INFO'->'PARA'->'DEFA' but got " PRINTF_SIZE ", ignoring this field", len);
    buf->Skip(len);
  } else {
    _cur_parameter->def_value = buf->ReadDWord();
  }
  _cur.grfconfig->has_param_defaults = true;
  return true;
}
 
typedef bool (*DataHandler)(size_t, ByteReader *);  
typedef bool (*TextHandler)(byte, const char *str); 
typedef bool (*BranchHandler)(ByteReader *);        
 
struct AllowedSubtags {
  AllowedSubtags() :
    id(0),
    type(0)
  {}
 
  AllowedSubtags(uint32 id, DataHandler handler) :
    id(id),
    type('B')
  {
    this->handler.data = handler;
  }
 
  AllowedSubtags(uint32 id, TextHandler handler) :
    id(id),
    type('T')
  {
    this->handler.text = handler;
  }
 
  AllowedSubtags(uint32 id, BranchHandler handler) :
    id(id),
    type('C')
  {
    this->handler.call_handler = true;
    this->handler.u.branch = handler;
  }
 
  AllowedSubtags(uint32 id, AllowedSubtags *subtags) :
    id(id),
    type('C')
  {
    this->handler.call_handler = false;
    this->handler.u.subtags = subtags;
  }
 
  uint32 id; 
  byte type; 
  union {
    DataHandler data; 
    TextHandler text; 
    struct {
      union {
        BranchHandler branch;    
        AllowedSubtags *subtags; 
      } u;
      bool call_handler; 
    };
  } handler;
};
 
static bool SkipUnknownInfo(ByteReader *buf, byte type);
static bool HandleNodes(ByteReader *buf, AllowedSubtags *tags);
 
static bool ChangeGRFParamValueNames(ByteReader *buf)
{
  byte type = buf->ReadByte();
  while (type != 0) {
    uint32 id = buf->ReadDWord();
    if (type != 'T' || id > _cur_parameter->max_value) {
      grfmsg(2, "StaticGRFInfo: all child nodes of 'INFO'->'PARA'->param_num->'VALU' should have type 't' and the value/bit number as id");
      if (!SkipUnknownInfo(buf, type)) return false;
      type = buf->ReadByte();
      continue;
    }
 
    byte langid = buf->ReadByte();
    const char *name_string = buf->ReadString();
 
    std::pair<uint32, GRFTextList> *val_name = _cur_parameter->value_names.Find(id);
    if (val_name != _cur_parameter->value_names.End()) {
      AddGRFTextToList(val_name->second, langid, _cur.grfconfig->ident.grfid, false, name_string);
    } else {
      GRFTextList list;
      AddGRFTextToList(list, langid, _cur.grfconfig->ident.grfid, false, name_string);
      _cur_parameter->value_names.Insert(id, list);
    }
 
    type = buf->ReadByte();
  }
  return true;
}
 
AllowedSubtags _tags_parameters[] = {
  AllowedSubtags('NAME', ChangeGRFParamName),
  AllowedSubtags('DESC', ChangeGRFParamDescription),
  AllowedSubtags('TYPE', ChangeGRFParamType),
  AllowedSubtags('LIMI', ChangeGRFParamLimits),
  AllowedSubtags('MASK', ChangeGRFParamMask),
  AllowedSubtags('VALU', ChangeGRFParamValueNames),
  AllowedSubtags('DFLT', ChangeGRFParamDefault),
  AllowedSubtags()
};
 
static bool HandleParameterInfo(ByteReader *buf)
{
  byte type = buf->ReadByte();
  while (type != 0) {
    uint32 id = buf->ReadDWord();
    if (type != 'C' || id >= _cur.grfconfig->num_valid_params) {
      grfmsg(2, "StaticGRFInfo: all child nodes of 'INFO'->'PARA' should have type 'C' and their parameter number as id");
      if (!SkipUnknownInfo(buf, type)) return false;
      type = buf->ReadByte();
      continue;
    }
 
    if (id >= _cur.grfconfig->param_info.size()) {
      _cur.grfconfig->param_info.resize(id + 1);
    }
    if (_cur.grfconfig->param_info[id] == nullptr) {
      _cur.grfconfig->param_info[id] = new GRFParameterInfo(id);
    }
    _cur_parameter = _cur.grfconfig->param_info[id];
    /* Read all parameter-data and process each node. */
    if (!HandleNodes(buf, _tags_parameters)) return false;
    type = buf->ReadByte();
  }
  return true;
}
 
AllowedSubtags _tags_info[] = {
  AllowedSubtags('NAME', ChangeGRFName),
  AllowedSubtags('DESC', ChangeGRFDescription),
  AllowedSubtags('URL_', ChangeGRFURL),
  AllowedSubtags('NPAR', ChangeGRFNumUsedParams),
  AllowedSubtags('PALS', ChangeGRFPalette),
  AllowedSubtags('BLTR', ChangeGRFBlitter),
  AllowedSubtags('VRSN', ChangeGRFVersion),
  AllowedSubtags('MINV', ChangeGRFMinVersion),
  AllowedSubtags('PARA', HandleParameterInfo),
  AllowedSubtags()
};
 
AllowedSubtags _tags_root[] = {
  AllowedSubtags('INFO', _tags_info),
  AllowedSubtags()
};
 
 
static bool SkipUnknownInfo(ByteReader *buf, byte type)
{
  /* type and id are already read */
  switch (type) {
    case 'C': {
      byte new_type = buf->ReadByte();
      while (new_type != 0) {
        buf->ReadDWord(); // skip the id
        if (!SkipUnknownInfo(buf, new_type)) return false;
        new_type = buf->ReadByte();
      }
      break;
    }
 
    case 'T':
      buf->ReadByte(); // lang
      buf->ReadString(); // actual text
      break;
 
    case 'B': {
      uint16 size = buf->ReadWord();
      buf->Skip(size);
      break;
    }
 
    default:
      return false;
  }
 
  return true;
}
 
static bool HandleNode(byte type, uint32 id, ByteReader *buf, AllowedSubtags subtags[])
{
  uint i = 0;
  AllowedSubtags *tag;
  while ((tag = &subtags[i++])->type != 0) {
    if (tag->id != BSWAP32(id) || tag->type != type) continue;
    switch (type) {
      default: NOT_REACHED();
 
      case 'T': {
        byte langid = buf->ReadByte();
        return tag->handler.text(langid, buf->ReadString());
      }
 
      case 'B': {
        size_t len = buf->ReadWord();
        if (buf->Remaining() < len) return false;
        return tag->handler.data(len, buf);
      }
 
      case 'C': {
        if (tag->handler.call_handler) {
          return tag->handler.u.branch(buf);
        }
        return HandleNodes(buf, tag->handler.u.subtags);
      }
    }
  }
  grfmsg(2, "StaticGRFInfo: unknown type/id combination found, type=%c, id=%x", type, id);
  return SkipUnknownInfo(buf, type);
}
 
static bool HandleNodes(ByteReader *buf, AllowedSubtags subtags[])
{
  byte type = buf->ReadByte();
  while (type != 0) {
    uint32 id = buf->ReadDWord();
    if (!HandleNode(type, id, buf, subtags)) return false;
    type = buf->ReadByte();
  }
  return true;
}
 
static void StaticGRFInfo(ByteReader *buf)
{
  /* <14> <type> <id> <text/data...> */
  HandleNodes(buf, _tags_root);
}
 
static void GRFUnsafe(ByteReader *buf)
{
  SetBit(_cur.grfconfig->flags, GCF_UNSAFE);
 
  /* Skip remainder of GRF */
  _cur.skip_sprites = -1;
}
 
 
static void InitializeGRFSpecial()
{
  _ttdpatch_flags[0] = ((_settings_game.station.never_expire_airports ? 1U : 0U) << 0x0C)  // keepsmallairport
                     |                                                       (1U << 0x0D)  // newairports
                     |                                                       (1U << 0x0E)  // largestations
                     | ((_settings_game.construction.max_bridge_length > 16 ? 1U : 0U) << 0x0F)  // longbridges
                     |                                                       (0U << 0x10)  // loadtime
                     |                                                       (1U << 0x12)  // presignals
                     |                                                       (1U << 0x13)  // extpresignals
                     | ((_settings_game.vehicle.never_expire_vehicles ? 1U : 0U) << 0x16)  // enginespersist
                     |                                                       (1U << 0x1B)  // multihead
                     |                                                       (1U << 0x1D)  // lowmemory
                     |                                                       (1U << 0x1E); // generalfixes
 
  _ttdpatch_flags[1] =   ((_settings_game.economy.station_noise_level ? 1U : 0U) << 0x07)  // moreairports - based on units of noise
                     |                                                       (1U << 0x08)  // mammothtrains
                     |                                                       (1U << 0x09)  // trainrefit
                     |                                                       (0U << 0x0B)  // subsidiaries
                     |         ((_settings_game.order.gradual_loading ? 1U : 0U) << 0x0C)  // gradualloading
                     |                                                       (1U << 0x12)  // unifiedmaglevmode - set bit 0 mode. Not revelant to OTTD
                     |                                                       (1U << 0x13)  // unifiedmaglevmode - set bit 1 mode
                     |                                                       (1U << 0x14)  // bridgespeedlimits
                     |                                                       (1U << 0x16)  // eternalgame
                     |                                                       (1U << 0x17)  // newtrains
                     |                                                       (1U << 0x18)  // newrvs
                     |                                                       (1U << 0x19)  // newships
                     |                                                       (1U << 0x1A)  // newplanes
                     | ((_settings_game.construction.train_signal_side == 1 ? 1U : 0U) << 0x1B)  // signalsontrafficside
                     |       ((_settings_game.vehicle.disable_elrails ? 0U : 1U) << 0x1C); // electrifiedrailway
 
  _ttdpatch_flags[2] =                                                       (1U << 0x01)  // loadallgraphics - obsolote
                     |                                                       (1U << 0x03)  // semaphores
                     |                                                       (1U << 0x0A)  // newobjects
                     |                                                       (0U << 0x0B)  // enhancedgui
                     |                                                       (0U << 0x0C)  // newagerating
                     |  ((_settings_game.construction.build_on_slopes ? 1U : 0U) << 0x0D)  // buildonslopes
                     |                                                       (1U << 0x0E)  // fullloadany
                     |                                                       (1U << 0x0F)  // planespeed
                     |                                                       (0U << 0x10)  // moreindustriesperclimate - obsolete
                     |                                                       (0U << 0x11)  // moretoylandfeatures
                     |                                                       (1U << 0x12)  // newstations
                     |                                                       (1U << 0x13)  // tracktypecostdiff
                     |                                                       (1U << 0x14)  // manualconvert
                     |  ((_settings_game.construction.build_on_slopes ? 1U : 0U) << 0x15)  // buildoncoasts
                     |                                                       (1U << 0x16)  // canals
                     |                                                       (1U << 0x17)  // newstartyear
                     |    ((_settings_game.vehicle.freight_trains > 1 ? 1U : 0U) << 0x18)  // freighttrains
                     |                                                       (1U << 0x19)  // newhouses
                     |                                                       (1U << 0x1A)  // newbridges
                     |                                                       (1U << 0x1B)  // newtownnames
                     |                                                       (1U << 0x1C)  // moreanimation
                     |    ((_settings_game.vehicle.wagon_speed_limits ? 1U : 0U) << 0x1D)  // wagonspeedlimits
                     |                                                       (1U << 0x1E)  // newshistory
                     |                                                       (0U << 0x1F); // custombridgeheads
 
  _ttdpatch_flags[3] =                                                       (0U << 0x00)  // newcargodistribution
                     |                                                       (1U << 0x01)  // windowsnap
                     | ((_settings_game.economy.allow_town_roads || _generating_world ? 0U : 1U) << 0x02)  // townbuildnoroad
                     |                                                       (1U << 0x03)  // pathbasedsignalling
                     |                                                       (0U << 0x04)  // aichoosechance
                     |                                                       (1U << 0x05)  // resolutionwidth
                     |                                                       (1U << 0x06)  // resolutionheight
                     |                                                       (1U << 0x07)  // newindustries
                     |           ((_settings_game.order.improved_load ? 1U : 0U) << 0x08)  // fifoloading
                     |                                                       (0U << 0x09)  // townroadbranchprob
                     |                                                       (0U << 0x0A)  // tempsnowline
                     |                                                       (1U << 0x0B)  // newcargo
                     |                                                       (1U << 0x0C)  // enhancemultiplayer
                     |                                                       (1U << 0x0D)  // onewayroads
                     |                                                       (1U << 0x0E)  // irregularstations
                     |                                                       (1U << 0x0F)  // statistics
                     |                                                       (1U << 0x10)  // newsounds
                     |                                                       (1U << 0x11)  // autoreplace
                     |                                                       (1U << 0x12)  // autoslope
                     |                                                       (0U << 0x13)  // followvehicle
                     |                                                       (1U << 0x14)  // trams
                     |                                                       (0U << 0x15)  // enhancetunnels
                     |                                                       (1U << 0x16)  // shortrvs
                     |                                                       (1U << 0x17)  // articulatedrvs
                     |       ((_settings_game.vehicle.dynamic_engines ? 1U : 0U) << 0x18)  // dynamic engines
                     |                                                       (1U << 0x1E)  // variablerunningcosts
                     |                                                       (1U << 0x1F); // any switch is on
 
  _ttdpatch_flags[4] =                                                       (1U << 0x00)  // larger persistent storage
                     |             ((_settings_game.economy.inflation ? 1U : 0U) << 0x01); // inflation is on
}
 
static void ResetCustomStations()
{
  for (GRFFile * const file : _grf_files) {
    StationSpec **&stations = file->stations;
    if (stations == nullptr) continue;
    for (uint i = 0; i < NUM_STATIONS_PER_GRF; i++) {
      if (stations[i] == nullptr) continue;
      StationSpec *statspec = stations[i];
 
      /* Release this station */
      delete statspec;
    }
 
    /* Free and reset the station data */
    free(stations);
    stations = nullptr;
  }
}
 
static void ResetCustomHouses()
{
  for (GRFFile * const file : _grf_files) {
    HouseSpec **&housespec = file->housespec;
    if (housespec == nullptr) continue;
    for (uint i = 0; i < NUM_HOUSES_PER_GRF; i++) {
      free(housespec[i]);
    }
 
    free(housespec);
    housespec = nullptr;
  }
}
 
static void ResetCustomAirports()
{
  for (GRFFile * const file : _grf_files) {
    AirportSpec **aslist = file->airportspec;
    if (aslist != nullptr) {
      for (uint i = 0; i < NUM_AIRPORTS_PER_GRF; i++) {
        AirportSpec *as = aslist[i];
 
        if (as != nullptr) {
          /* We need to remove the tiles layouts */
          for (int j = 0; j < as->num_table; j++) {
            /* remove the individual layouts */
            free(as->table[j]);
          }
          free(as->table);
          free(as->depot_table);
          free(as->rotation);
 
          free(as);
        }
      }
      free(aslist);
      file->airportspec = nullptr;
    }
 
    AirportTileSpec **&airporttilespec = file->airtspec;
    if (airporttilespec != nullptr) {
      for (uint i = 0; i < NUM_AIRPORTTILES_PER_GRF; i++) {
        free(airporttilespec[i]);
      }
      free(airporttilespec);
      airporttilespec = nullptr;
    }
  }
}
 
static void ResetCustomIndustries()
{
  for (GRFFile * const file : _grf_files) {
    IndustrySpec **&industryspec = file->industryspec;
    IndustryTileSpec **&indtspec = file->indtspec;
 
    /* We are verifiying both tiles and industries specs loaded from the grf file
     * First, let's deal with industryspec */
    if (industryspec != nullptr) {
      for (uint i = 0; i < NUM_INDUSTRYTYPES_PER_GRF; i++) {
        IndustrySpec *ind = industryspec[i];
        delete ind;
      }
 
      free(industryspec);
      industryspec = nullptr;
    }
 
    if (indtspec == nullptr) continue;
    for (uint i = 0; i < NUM_INDUSTRYTILES_PER_GRF; i++) {
      free(indtspec[i]);
    }
 
    free(indtspec);
    indtspec = nullptr;
  }
}
 
static void ResetCustomObjects()
{
  for (GRFFile * const file : _grf_files) {
    ObjectSpec **&objectspec = file->objectspec;
    if (objectspec == nullptr) continue;
    for (uint i = 0; i < NUM_OBJECTS_PER_GRF; i++) {
      free(objectspec[i]);
    }
 
    free(objectspec);
    objectspec = nullptr;
  }
}
 
static void ResetNewGRF()
{
  for (GRFFile * const file : _grf_files) {
    delete file;
  }
 
  _grf_files.clear();
  _cur.grffile   = nullptr;
}
 
static void ResetNewGRFErrors()
{
  for (GRFConfig *c = _grfconfig; c != nullptr; c = c->next) {
    if (!HasBit(c->flags, GCF_COPY) && c->error != nullptr) {
      delete c->error;
      c->error = nullptr;
    }
  }
}
 
void ResetNewGRFData()
{
  CleanUpStrings();
  CleanUpGRFTownNames();
 
  /* Copy/reset original engine info data */
  SetupEngines();
 
  /* Copy/reset original bridge info data */
  ResetBridges();
 
  /* Reset rail type information */
  ResetRailTypes();
 
  /* Copy/reset original road type info data */
  ResetRoadTypes();
 
  /* Allocate temporary refit/cargo class data */
  _gted = CallocT<GRFTempEngineData>(Engine::GetPoolSize());
 
  /* Fill rail type label temporary data for default trains */
  for (const Engine *e : Engine::IterateType(VEH_TRAIN)) {
    _gted[e->index].railtypelabel = GetRailTypeInfo(e->u.rail.railtype)->label;
  }
 
  /* Reset GRM reservations */
  memset(&_grm_engines, 0, sizeof(_grm_engines));
  memset(&_grm_cargoes, 0, sizeof(_grm_cargoes));
 
  /* Reset generic feature callback lists */
  ResetGenericCallbacks();
 
  /* Reset price base data */
  ResetPriceBaseMultipliers();
 
  /* Reset the curencies array */
  ResetCurrencies();
 
  /* Reset the house array */
  ResetCustomHouses();
  ResetHouses();
 
  /* Reset the industries structures*/
  ResetCustomIndustries();
  ResetIndustries();
 
  /* Reset the objects. */
  ObjectClass::Reset();
  ResetCustomObjects();
  ResetObjects();
 
  /* Reset station classes */
  StationClass::Reset();
  ResetCustomStations();
 
  /* Reset airport-related structures */
  AirportClass::Reset();
  ResetCustomAirports();
  AirportSpec::ResetAirports();
  AirportTileSpec::ResetAirportTiles();
 
  /* Reset canal sprite groups and flags */
  memset(_water_feature, 0, sizeof(_water_feature));
 
  /* Reset the snowline table. */
  ClearSnowLine();
 
  /* Reset NewGRF files */
  ResetNewGRF();
 
  /* Reset NewGRF errors. */
  ResetNewGRFErrors();
 
  /* Set up the default cargo types */
  SetupCargoForClimate(_settings_game.game_creation.landscape);
 
  /* Reset misc GRF features and train list display variables */
  _misc_grf_features = 0;
 
  _loaded_newgrf_features.has_2CC           = false;
  _loaded_newgrf_features.used_liveries     = 1 << LS_DEFAULT;
  _loaded_newgrf_features.shore             = SHORE_REPLACE_NONE;
  _loaded_newgrf_features.tram              = TRAMWAY_REPLACE_DEPOT_NONE;
 
  /* Clear all GRF overrides */
  _grf_id_overrides.clear();
 
  InitializeSoundPool();
  _spritegroup_pool.CleanPool();
}
 
void ResetPersistentNewGRFData()
{
  /* Reset override managers */
  _engine_mngr.ResetToDefaultMapping();
  _house_mngr.ResetMapping();
  _industry_mngr.ResetMapping();
  _industile_mngr.ResetMapping();
  _airport_mngr.ResetMapping();
  _airporttile_mngr.ResetMapping();
}
 
static void BuildCargoTranslationMap()
{
  memset(_cur.grffile->cargo_map, 0xFF, sizeof(_cur.grffile->cargo_map));
 
  for (CargoID c = 0; c < NUM_CARGO; c++) {
    const CargoSpec *cs = CargoSpec::Get(c);
    if (!cs->IsValid()) continue;
 
    if (_cur.grffile->cargo_list.size() == 0) {
      /* Default translation table, so just a straight mapping to bitnum */
      _cur.grffile->cargo_map[c] = cs->bitnum;
    } else {
      /* Check the translation table for this cargo's label */
      int idx = find_index(_cur.grffile->cargo_list, {cs->label});
      if (idx >= 0) _cur.grffile->cargo_map[c] = idx;
    }
  }
}
 
static void InitNewGRFFile(const GRFConfig *config)
{
  GRFFile *newfile = GetFileByFilename(config->filename);
  if (newfile != nullptr) {
    /* We already loaded it once. */
    _cur.grffile = newfile;
    return;
  }
 
  newfile = new GRFFile(config);
  _grf_files.push_back(_cur.grffile = newfile);
}
 
GRFFile::GRFFile(const GRFConfig *config)
{
  this->filename = stredup(config->filename);
  this->grfid = config->ident.grfid;
 
  /* Initialise local settings to defaults */
  this->traininfo_vehicle_pitch = 0;
  this->traininfo_vehicle_width = TRAININFO_DEFAULT_VEHICLE_WIDTH;
 
  /* Mark price_base_multipliers as 'not set' */
  for (Price i = PR_BEGIN; i < PR_END; i++) {
    this->price_base_multipliers[i] = INVALID_PRICE_MODIFIER;
  }
 
  /* Initialise rail type map with default rail types */
  std::fill(std::begin(this->railtype_map), std::end(this->railtype_map), INVALID_RAILTYPE);
  this->railtype_map[0] = RAILTYPE_RAIL;
  this->railtype_map[1] = RAILTYPE_ELECTRIC;
  this->railtype_map[2] = RAILTYPE_MONO;
  this->railtype_map[3] = RAILTYPE_MAGLEV;
 
  /* Initialise road type map with default road types */
  std::fill(std::begin(this->roadtype_map), std::end(this->roadtype_map), INVALID_ROADTYPE);
  this->roadtype_map[0] = ROADTYPE_ROAD;
 
  /* Initialise tram type map with default tram types */
  std::fill(std::begin(this->tramtype_map), std::end(this->tramtype_map), INVALID_ROADTYPE);
  this->tramtype_map[0] = ROADTYPE_TRAM;
 
  /* Copy the initial parameter list
   * 'Uninitialised' parameters are zeroed as that is their default value when dynamically creating them. */
  static_assert(lengthof(this->param) == lengthof(config->param) && lengthof(this->param) == 0x80);
 
  assert(config->num_params <= lengthof(config->param));
  this->param_end = config->num_params;
  if (this->param_end > 0) {
    MemCpyT(this->param, config->param, this->param_end);
  }
}
 
GRFFile::~GRFFile()
{
  free(this->filename);
  delete[] this->language_map;
}
 
 
static void CalculateRefitMasks()
{
  CargoTypes original_known_cargoes = 0;
  for (int ct = 0; ct != NUM_ORIGINAL_CARGO; ++ct) {
    CargoID cid = GetDefaultCargoID(_settings_game.game_creation.landscape, static_cast<CargoType>(ct));
    if (cid != CT_INVALID) SetBit(original_known_cargoes, cid);
  }
 
  for (Engine *e : Engine::Iterate()) {
    EngineID engine = e->index;
    EngineInfo *ei = &e->info;
    bool only_defaultcargo; 
 
    /* If the NewGRF did not set any cargo properties, we apply default values. */
    if (_gted[engine].defaultcargo_grf == nullptr) {
      /* If the vehicle has any capacity, apply the default refit masks */
      if (e->type != VEH_TRAIN || e->u.rail.capacity != 0) {
        static constexpr byte T = 1 << LT_TEMPERATE;
        static constexpr byte A = 1 << LT_ARCTIC;
        static constexpr byte S = 1 << LT_TROPIC;
        static constexpr byte Y = 1 << LT_TOYLAND;
        static const struct DefaultRefitMasks {
          byte climate;
          CargoType cargo_type;
          CargoTypes cargo_allowed;
          CargoTypes cargo_disallowed;
        } _default_refit_masks[] = {
          {T | A | S | Y, CT_PASSENGERS, CC_PASSENGERS,               0},
          {T | A | S    , CT_MAIL,       CC_MAIL,                     0},
          {T | A | S    , CT_VALUABLES,  CC_ARMOURED,                 CC_LIQUID},
          {            Y, CT_MAIL,       CC_MAIL | CC_ARMOURED,       CC_LIQUID},
          {T | A        , CT_COAL,       CC_BULK,                     0},
          {        S    , CT_COPPER_ORE, CC_BULK,                     0},
          {            Y, CT_SUGAR,      CC_BULK,                     0},
          {T | A | S    , CT_OIL,        CC_LIQUID,                   0},
          {            Y, CT_COLA,       CC_LIQUID,                   0},
          {T            , CT_GOODS,      CC_PIECE_GOODS | CC_EXPRESS, CC_LIQUID | CC_PASSENGERS},
          {    A | S    , CT_GOODS,      CC_PIECE_GOODS | CC_EXPRESS, CC_LIQUID | CC_PASSENGERS | CC_REFRIGERATED},
          {    A | S    , CT_FOOD,       CC_REFRIGERATED,             0},
          {            Y, CT_CANDY,      CC_PIECE_GOODS | CC_EXPRESS, CC_LIQUID | CC_PASSENGERS},
        };
 
        if (e->type == VEH_AIRCRAFT) {
          /* Aircraft default to "light" cargoes */
          _gted[engine].cargo_allowed = CC_PASSENGERS | CC_MAIL | CC_ARMOURED | CC_EXPRESS;
          _gted[engine].cargo_disallowed = CC_LIQUID;
        } else if (e->type == VEH_SHIP) {
          switch (ei->cargo_type) {
            case CT_PASSENGERS:
              /* Ferries */
              _gted[engine].cargo_allowed = CC_PASSENGERS;
              _gted[engine].cargo_disallowed = 0;
              break;
            case CT_OIL:
              /* Tankers */
              _gted[engine].cargo_allowed = CC_LIQUID;
              _gted[engine].cargo_disallowed = 0;
              break;
            default:
              /* Cargo ships */
              if (_settings_game.game_creation.landscape == LT_TOYLAND) {
                /* No tanker in toyland :( */
                _gted[engine].cargo_allowed = CC_MAIL | CC_ARMOURED | CC_EXPRESS | CC_BULK | CC_PIECE_GOODS | CC_LIQUID;
                _gted[engine].cargo_disallowed = CC_PASSENGERS;
              } else {
                _gted[engine].cargo_allowed = CC_MAIL | CC_ARMOURED | CC_EXPRESS | CC_BULK | CC_PIECE_GOODS;
                _gted[engine].cargo_disallowed = CC_LIQUID | CC_PASSENGERS;
              }
              break;
          }
          e->u.ship.old_refittable = true;
        } else if (e->type == VEH_TRAIN && e->u.rail.railveh_type != RAILVEH_WAGON) {
          /* Train engines default to all cargoes, so you can build single-cargo consists with fast engines.
           * Trains loading multiple cargoes may start stations accepting unwanted cargoes. */
          _gted[engine].cargo_allowed = CC_PASSENGERS | CC_MAIL | CC_ARMOURED | CC_EXPRESS | CC_BULK | CC_PIECE_GOODS | CC_LIQUID;
          _gted[engine].cargo_disallowed = 0;
        } else {
          /* Train wagons and road vehicles are classified by their default cargo type */
          for (const auto &drm : _default_refit_masks) {
            if (!HasBit(drm.climate, _settings_game.game_creation.landscape)) continue;
            if (drm.cargo_type != ei->cargo_type) continue;
 
            _gted[engine].cargo_allowed = drm.cargo_allowed;
            _gted[engine].cargo_disallowed = drm.cargo_disallowed;
            break;
          }
 
          /* All original cargoes have specialised vehicles, so exclude them */
          _gted[engine].ctt_exclude_mask = original_known_cargoes;
        }
      }
      _gted[engine].UpdateRefittability(_gted[engine].cargo_allowed != 0);
 
      /* Translate cargo_type using the original climate-specific cargo table. */
      ei->cargo_type = GetDefaultCargoID(_settings_game.game_creation.landscape, static_cast<CargoType>(ei->cargo_type));
      if (ei->cargo_type != CT_INVALID) ClrBit(_gted[engine].ctt_exclude_mask, ei->cargo_type);
    }
 
    /* Compute refittability */
    {
      CargoTypes mask = 0;
      CargoTypes not_mask = 0;
      CargoTypes xor_mask = ei->refit_mask;
 
      /* If the original masks set by the grf are zero, the vehicle shall only carry the default cargo.
       * Note: After applying the translations, the vehicle may end up carrying no defined cargo. It becomes unavailable in that case. */
      only_defaultcargo = _gted[engine].refittability != GRFTempEngineData::NONEMPTY;
 
      if (_gted[engine].cargo_allowed != 0) {
        /* Build up the list of cargo types from the set cargo classes. */
        for (const CargoSpec *cs : CargoSpec::Iterate()) {
          if (_gted[engine].cargo_allowed    & cs->classes) SetBit(mask,     cs->Index());
          if (_gted[engine].cargo_disallowed & cs->classes) SetBit(not_mask, cs->Index());
        }
      }
 
      ei->refit_mask = ((mask & ~not_mask) ^ xor_mask) & _cargo_mask;
 
      /* Apply explicit refit includes/excludes. */
      ei->refit_mask |= _gted[engine].ctt_include_mask;
      ei->refit_mask &= ~_gted[engine].ctt_exclude_mask;
    }
 
    /* Clear invalid cargoslots (from default vehicles or pre-NewCargo GRFs) */
    if (ei->cargo_type != CT_INVALID && !HasBit(_cargo_mask, ei->cargo_type)) ei->cargo_type = CT_INVALID;
 
    /* Ensure that the vehicle is either not refittable, or that the default cargo is one of the refittable cargoes.
     * Note: Vehicles refittable to no cargo are handle differently to vehicle refittable to a single cargo. The latter might have subtypes. */
    if (!only_defaultcargo && (e->type != VEH_SHIP || e->u.ship.old_refittable) && ei->cargo_type != CT_INVALID && !HasBit(ei->refit_mask, ei->cargo_type)) {
      ei->cargo_type = CT_INVALID;
    }
 
    /* Check if this engine's cargo type is valid. If not, set to the first refittable
     * cargo type. Finally disable the vehicle, if there is still no cargo. */
    if (ei->cargo_type == CT_INVALID && ei->refit_mask != 0) {
      /* Figure out which CTT to use for the default cargo, if it is 'first refittable'. */
      const uint8 *cargo_map_for_first_refittable = nullptr;
      {
        const GRFFile *file = _gted[engine].defaultcargo_grf;
        if (file == nullptr) file = e->GetGRF();
        if (file != nullptr && file->grf_version >= 8 && file->cargo_list.size() != 0) {
          cargo_map_for_first_refittable = file->cargo_map;
        }
      }
 
      if (cargo_map_for_first_refittable != nullptr) {
        /* Use first refittable cargo from cargo translation table */
        byte best_local_slot = 0xFF;
        for (CargoID cargo_type : SetCargoBitIterator(ei->refit_mask)) {
          byte local_slot = cargo_map_for_first_refittable[cargo_type];
          if (local_slot < best_local_slot) {
            best_local_slot = local_slot;
            ei->cargo_type = cargo_type;
          }
        }
      }
 
      if (ei->cargo_type == CT_INVALID) {
        /* Use first refittable cargo slot */
        ei->cargo_type = (CargoID)FindFirstBit(ei->refit_mask);
      }
    }
    if (ei->cargo_type == CT_INVALID) ei->climates = 0;
 
    /* Clear refit_mask for not refittable ships */
    if (e->type == VEH_SHIP && !e->u.ship.old_refittable) {
      ei->refit_mask = 0;
    }
  }
}
 
static void FinaliseCanals()
{
  for (uint i = 0; i < CF_END; i++) {
    if (_water_feature[i].grffile != nullptr) {
      _water_feature[i].callback_mask = _water_feature[i].grffile->canal_local_properties[i].callback_mask;
      _water_feature[i].flags = _water_feature[i].grffile->canal_local_properties[i].flags;
    }
  }
}
 
static void FinaliseEngineArray()
{
  for (Engine *e : Engine::Iterate()) {
    if (e->GetGRF() == nullptr) {
      const EngineIDMapping &eid = _engine_mngr[e->index];
      if (eid.grfid != INVALID_GRFID || eid.internal_id != eid.substitute_id) {
        e->info.string_id = STR_NEWGRF_INVALID_ENGINE;
      }
    }
 
    /* Do final mapping on variant engine ID and set appropriate flags on variant engine */
    if (e->info.variant_id != INVALID_ENGINE) {
      e->info.variant_id = GetNewEngineID(e->grf_prop.grffile, e->type, e->info.variant_id);
      if (e->info.variant_id != INVALID_ENGINE) {
        Engine::Get(e->info.variant_id)->display_flags |= EngineDisplayFlags::HasVariants | EngineDisplayFlags::IsFolded;
      }
    }
 
    if (!HasBit(e->info.climates, _settings_game.game_creation.landscape)) continue;
 
    /* Skip wagons, there livery is defined via the engine */
    if (e->type != VEH_TRAIN || e->u.rail.railveh_type != RAILVEH_WAGON) {
      LiveryScheme ls = GetEngineLiveryScheme(e->index, INVALID_ENGINE, nullptr);
      SetBit(_loaded_newgrf_features.used_liveries, ls);
      /* Note: For ships and roadvehicles we assume that they cannot be refitted between passenger and freight */
 
      if (e->type == VEH_TRAIN) {
        SetBit(_loaded_newgrf_features.used_liveries, LS_FREIGHT_WAGON);
        switch (ls) {
          case LS_STEAM:
          case LS_DIESEL:
          case LS_ELECTRIC:
          case LS_MONORAIL:
          case LS_MAGLEV:
            SetBit(_loaded_newgrf_features.used_liveries, LS_PASSENGER_WAGON_STEAM + ls - LS_STEAM);
            break;
 
          case LS_DMU:
          case LS_EMU:
            SetBit(_loaded_newgrf_features.used_liveries, LS_PASSENGER_WAGON_DIESEL + ls - LS_DMU);
            break;
 
          default: NOT_REACHED();
        }
      }
    }
  }
}
 
static void FinaliseCargoArray()
{
  for (CargoID c = 0; c < NUM_CARGO; c++) {
    CargoSpec *cs = CargoSpec::Get(c);
    if (!cs->IsValid()) {
      cs->name = cs->name_single = cs->units_volume = STR_NEWGRF_INVALID_CARGO;
      cs->quantifier = STR_NEWGRF_INVALID_CARGO_QUANTITY;
      cs->abbrev = STR_NEWGRF_INVALID_CARGO_ABBREV;
    }
  }
}
 
static bool IsHouseSpecValid(HouseSpec *hs, const HouseSpec *next1, const HouseSpec *next2, const HouseSpec *next3, const char *filename)
{
  if (((hs->building_flags & BUILDING_HAS_2_TILES) != 0 &&
        (next1 == nullptr || !next1->enabled || (next1->building_flags & BUILDING_HAS_1_TILE) != 0)) ||
      ((hs->building_flags & BUILDING_HAS_4_TILES) != 0 &&
        (next2 == nullptr || !next2->enabled || (next2->building_flags & BUILDING_HAS_1_TILE) != 0 ||
        next3 == nullptr || !next3->enabled || (next3->building_flags & BUILDING_HAS_1_TILE) != 0))) {
    hs->enabled = false;
    if (filename != nullptr) Debug(grf, 1, "FinaliseHouseArray: {} defines house {} as multitile, but no suitable tiles follow. Disabling house.", filename, hs->grf_prop.local_id);
    return false;
  }
 
  /* Some places sum population by only counting north tiles. Other places use all tiles causing desyncs.
   * As the newgrf specs define population to be zero for non-north tiles, we just disable the offending house.
   * If you want to allow non-zero populations somewhen, make sure to sum the population of all tiles in all places. */
  if (((hs->building_flags & BUILDING_HAS_2_TILES) != 0 && next1->population != 0) ||
      ((hs->building_flags & BUILDING_HAS_4_TILES) != 0 && (next2->population != 0 || next3->population != 0))) {
    hs->enabled = false;
    if (filename != nullptr) Debug(grf, 1, "FinaliseHouseArray: {} defines multitile house {} with non-zero population on additional tiles. Disabling house.", filename, hs->grf_prop.local_id);
    return false;
  }
 
  /* Substitute type is also used for override, and having an override with a different size causes crashes.
   * This check should only be done for NewGRF houses because grf_prop.subst_id is not set for original houses.*/
  if (filename != nullptr && (hs->building_flags & BUILDING_HAS_1_TILE) != (HouseSpec::Get(hs->grf_prop.subst_id)->building_flags & BUILDING_HAS_1_TILE)) {
    hs->enabled = false;
    Debug(grf, 1, "FinaliseHouseArray: {} defines house {} with different house size then it's substitute type. Disabling house.", filename, hs->grf_prop.local_id);
    return false;
  }
 
  /* Make sure that additional parts of multitile houses are not available. */
  if ((hs->building_flags & BUILDING_HAS_1_TILE) == 0 && (hs->building_availability & HZ_ZONALL) != 0 && (hs->building_availability & HZ_CLIMALL) != 0) {
    hs->enabled = false;
    if (filename != nullptr) Debug(grf, 1, "FinaliseHouseArray: {} defines house {} without a size but marked it as available. Disabling house.", filename, hs->grf_prop.local_id);
    return false;
  }
 
  return true;
}
 
static void EnsureEarlyHouse(HouseZones bitmask)
{
  Year min_year = MAX_YEAR;
 
  for (int i = 0; i < NUM_HOUSES; i++) {
    HouseSpec *hs = HouseSpec::Get(i);
    if (hs == nullptr || !hs->enabled) continue;
    if ((hs->building_availability & bitmask) != bitmask) continue;
    if (hs->min_year < min_year) min_year = hs->min_year;
  }
 
  if (min_year == 0) return;
 
  for (int i = 0; i < NUM_HOUSES; i++) {
    HouseSpec *hs = HouseSpec::Get(i);
    if (hs == nullptr || !hs->enabled) continue;
    if ((hs->building_availability & bitmask) != bitmask) continue;
    if (hs->min_year == min_year) hs->min_year = 0;
  }
}
 
static void FinaliseHouseArray()
{
  /* If there are no houses with start dates before 1930, then all houses
   * with start dates of 1930 have them reset to 0. This is in order to be
   * compatible with TTDPatch, where if no houses have start dates before
   * 1930 and the date is before 1930, the game pretends that this is 1930.
   * If there have been any houses defined with start dates before 1930 then
   * the dates are left alone.
   * On the other hand, why 1930? Just 'fix' the houses with the lowest
   * minimum introduction date to 0.
   */
  for (GRFFile * const file : _grf_files) {
    HouseSpec **&housespec = file->housespec;
    if (housespec == nullptr) continue;
 
    for (int i = 0; i < NUM_HOUSES_PER_GRF; i++) {
      HouseSpec *hs = housespec[i];
 
      if (hs == nullptr) continue;
 
      const HouseSpec *next1 = (i + 1 < NUM_HOUSES_PER_GRF ? housespec[i + 1] : nullptr);
      const HouseSpec *next2 = (i + 2 < NUM_HOUSES_PER_GRF ? housespec[i + 2] : nullptr);
      const HouseSpec *next3 = (i + 3 < NUM_HOUSES_PER_GRF ? housespec[i + 3] : nullptr);
 
      if (!IsHouseSpecValid(hs, next1, next2, next3, file->filename)) continue;
 
      _house_mngr.SetEntitySpec(hs);
    }
  }
 
  for (int i = 0; i < NUM_HOUSES; i++) {
    HouseSpec *hs = HouseSpec::Get(i);
    const HouseSpec *next1 = (i + 1 < NUM_HOUSES ? HouseSpec::Get(i + 1) : nullptr);
    const HouseSpec *next2 = (i + 2 < NUM_HOUSES ? HouseSpec::Get(i + 2) : nullptr);
    const HouseSpec *next3 = (i + 3 < NUM_HOUSES ? HouseSpec::Get(i + 3) : nullptr);
 
    /* We need to check all houses again to we are sure that multitile houses
     * did get consecutive IDs and none of the parts are missing. */
    if (!IsHouseSpecValid(hs, next1, next2, next3, nullptr)) {
      /* GetHouseNorthPart checks 3 houses that are directly before
       * it in the house pool. If any of those houses have multi-tile
       * flags set it assumes it's part of a multitile house. Since
       * we can have invalid houses in the pool marked as disabled, we
       * don't want to have them influencing valid tiles. As such set
       * building_flags to zero here to make sure any house following
       * this one in the pool is properly handled as 1x1 house. */
      hs->building_flags = TILE_NO_FLAG;
    }
  }
 
  HouseZones climate_mask = (HouseZones)(1 << (_settings_game.game_creation.landscape + 12));
  EnsureEarlyHouse(HZ_ZON1 | climate_mask);
  EnsureEarlyHouse(HZ_ZON2 | climate_mask);
  EnsureEarlyHouse(HZ_ZON3 | climate_mask);
  EnsureEarlyHouse(HZ_ZON4 | climate_mask);
  EnsureEarlyHouse(HZ_ZON5 | climate_mask);
 
  if (_settings_game.game_creation.landscape == LT_ARCTIC) {
    EnsureEarlyHouse(HZ_ZON1 | HZ_SUBARTC_ABOVE);
    EnsureEarlyHouse(HZ_ZON2 | HZ_SUBARTC_ABOVE);
    EnsureEarlyHouse(HZ_ZON3 | HZ_SUBARTC_ABOVE);
    EnsureEarlyHouse(HZ_ZON4 | HZ_SUBARTC_ABOVE);
    EnsureEarlyHouse(HZ_ZON5 | HZ_SUBARTC_ABOVE);
  }
}
 
static void FinaliseIndustriesArray()
{
  for (GRFFile * const file : _grf_files) {
    IndustrySpec **&industryspec = file->industryspec;
    IndustryTileSpec **&indtspec = file->indtspec;
    if (industryspec != nullptr) {
      for (int i = 0; i < NUM_INDUSTRYTYPES_PER_GRF; i++) {
        IndustrySpec *indsp = industryspec[i];
 
        if (indsp != nullptr && indsp->enabled) {
          StringID strid;
          /* process the conversion of text at the end, so to be sure everything will be fine
           * and available.  Check if it does not return undefind marker, which is a very good sign of a
           * substitute industry who has not changed the string been examined, thus using it as such */
          strid = GetGRFStringID(indsp->grf_prop.grffile->grfid, indsp->name);
          if (strid != STR_UNDEFINED) indsp->name = strid;
 
          strid = GetGRFStringID(indsp->grf_prop.grffile->grfid, indsp->closure_text);
          if (strid != STR_UNDEFINED) indsp->closure_text = strid;
 
          strid = GetGRFStringID(indsp->grf_prop.grffile->grfid, indsp->production_up_text);
          if (strid != STR_UNDEFINED) indsp->production_up_text = strid;
 
          strid = GetGRFStringID(indsp->grf_prop.grffile->grfid, indsp->production_down_text);
          if (strid != STR_UNDEFINED) indsp->production_down_text = strid;
 
          strid = GetGRFStringID(indsp->grf_prop.grffile->grfid, indsp->new_industry_text);
          if (strid != STR_UNDEFINED) indsp->new_industry_text = strid;
 
          if (indsp->station_name != STR_NULL) {
            /* STR_NULL (0) can be set by grf.  It has a meaning regarding assignation of the
             * station's name. Don't want to lose the value, therefore, do not process. */
            strid = GetGRFStringID(indsp->grf_prop.grffile->grfid, indsp->station_name);
            if (strid != STR_UNDEFINED) indsp->station_name = strid;
          }
 
          _industry_mngr.SetEntitySpec(indsp);
        }
      }
    }
 
    if (indtspec != nullptr) {
      for (int i = 0; i < NUM_INDUSTRYTILES_PER_GRF; i++) {
        IndustryTileSpec *indtsp = indtspec[i];
        if (indtsp != nullptr) {
          _industile_mngr.SetEntitySpec(indtsp);
        }
      }
    }
  }
 
  for (uint j = 0; j < NUM_INDUSTRYTYPES; j++) {
    IndustrySpec *indsp = &_industry_specs[j];
    if (indsp->enabled && indsp->grf_prop.grffile != nullptr) {
      for (uint i = 0; i < 3; i++) {
        indsp->conflicting[i] = MapNewGRFIndustryType(indsp->conflicting[i], indsp->grf_prop.grffile->grfid);
      }
    }
    if (!indsp->enabled) {
      indsp->name = STR_NEWGRF_INVALID_INDUSTRYTYPE;
    }
  }
}
 
static void FinaliseObjectsArray()
{
  for (GRFFile * const file : _grf_files) {
    ObjectSpec **&objectspec = file->objectspec;
    if (objectspec != nullptr) {
      for (int i = 0; i < NUM_OBJECTS_PER_GRF; i++) {
        if (objectspec[i] != nullptr && objectspec[i]->grf_prop.grffile != nullptr && objectspec[i]->enabled) {
          _object_mngr.SetEntitySpec(objectspec[i]);
        }
      }
    }
  }
}
 
static void FinaliseAirportsArray()
{
  for (GRFFile * const file : _grf_files) {
    AirportSpec **&airportspec = file->airportspec;
    if (airportspec != nullptr) {
      for (int i = 0; i < NUM_AIRPORTS_PER_GRF; i++) {
        if (airportspec[i] != nullptr && airportspec[i]->enabled) {
          _airport_mngr.SetEntitySpec(airportspec[i]);
        }
      }
    }
 
    AirportTileSpec **&airporttilespec = file->airtspec;
    if (airporttilespec != nullptr) {
      for (uint i = 0; i < NUM_AIRPORTTILES_PER_GRF; i++) {
        if (airporttilespec[i] != nullptr && airporttilespec[i]->enabled) {
          _airporttile_mngr.SetEntitySpec(airporttilespec[i]);
        }
      }
    }
  }
}
 
/* Here we perform initial decoding of some special sprites (as are they
 * described at http://www.ttdpatch.net/src/newgrf.txt, but this is only a very
 * partial implementation yet).
 * XXX: We consider GRF files trusted. It would be trivial to exploit OTTD by
 * a crafted invalid GRF file. We should tell that to the user somehow, or
 * better make this more robust in the future. */
static void DecodeSpecialSprite(byte *buf, uint num, GrfLoadingStage stage)
{
  /* XXX: There is a difference between staged loading in TTDPatch and
   * here.  In TTDPatch, for some reason actions 1 and 2 are carried out
   * during stage 1, whilst action 3 is carried out during stage 2 (to
   * "resolve" cargo IDs... wtf). This is a little problem, because cargo
   * IDs are valid only within a given set (action 1) block, and may be
   * overwritten after action 3 associates them. But overwriting happens
   * in an earlier stage than associating, so...  We just process actions
   * 1 and 2 in stage 2 now, let's hope that won't get us into problems.
   * --pasky
   * We need a pre-stage to set up GOTO labels of Action 0x10 because the grf
   * is not in memory and scanning the file every time would be too expensive.
   * In other stages we skip action 0x10 since it's already dealt with. */
  static const SpecialSpriteHandler handlers[][GLS_END] = {
    /* 0x00 */ { nullptr,       SafeChangeInfo, nullptr,         nullptr,         ReserveChangeInfo, FeatureChangeInfo, },
    /* 0x01 */ { SkipAct1,      SkipAct1,       SkipAct1,        SkipAct1,        SkipAct1,          NewSpriteSet, },
    /* 0x02 */ { nullptr,       nullptr,        nullptr,         nullptr,         nullptr,           NewSpriteGroup, },
    /* 0x03 */ { nullptr,       GRFUnsafe,      nullptr,         nullptr,         nullptr,           FeatureMapSpriteGroup, },
    /* 0x04 */ { nullptr,       nullptr,        nullptr,         nullptr,         nullptr,           FeatureNewName, },
    /* 0x05 */ { SkipAct5,      SkipAct5,       SkipAct5,        SkipAct5,        SkipAct5,          GraphicsNew, },
    /* 0x06 */ { nullptr,       nullptr,        nullptr,         CfgApply,        CfgApply,          CfgApply, },
    /* 0x07 */ { nullptr,       nullptr,        nullptr,         nullptr,         SkipIf,            SkipIf, },
    /* 0x08 */ { ScanInfo,      nullptr,        nullptr,         GRFInfo,         GRFInfo,           GRFInfo, },
    /* 0x09 */ { nullptr,       nullptr,        nullptr,         SkipIf,          SkipIf,            SkipIf, },
    /* 0x0A */ { SkipActA,      SkipActA,       SkipActA,        SkipActA,        SkipActA,          SpriteReplace, },
    /* 0x0B */ { nullptr,       nullptr,        nullptr,         GRFLoadError,    GRFLoadError,      GRFLoadError, },
    /* 0x0C */ { nullptr,       nullptr,        nullptr,         GRFComment,      nullptr,           GRFComment, },
    /* 0x0D */ { nullptr,       SafeParamSet,   nullptr,         ParamSet,        ParamSet,          ParamSet, },
    /* 0x0E */ { nullptr,       SafeGRFInhibit, nullptr,         GRFInhibit,      GRFInhibit,        GRFInhibit, },
    /* 0x0F */ { nullptr,       GRFUnsafe,      nullptr,         FeatureTownName, nullptr,           nullptr, },
    /* 0x10 */ { nullptr,       nullptr,        DefineGotoLabel, nullptr,         nullptr,           nullptr, },
    /* 0x11 */ { SkipAct11,     GRFUnsafe,      SkipAct11,       GRFSound,        SkipAct11,         GRFSound, },
    /* 0x12 */ { SkipAct12,     SkipAct12,      SkipAct12,       SkipAct12,       SkipAct12,         LoadFontGlyph, },
    /* 0x13 */ { nullptr,       nullptr,        nullptr,         nullptr,         nullptr,           TranslateGRFStrings, },
    /* 0x14 */ { StaticGRFInfo, nullptr,        nullptr,         nullptr,         nullptr,           nullptr, },
  };
 
  GRFLocation location(_cur.grfconfig->ident.grfid, _cur.nfo_line);
 
  GRFLineToSpriteOverride::iterator it = _grf_line_to_action6_sprite_override.find(location);
  if (it == _grf_line_to_action6_sprite_override.end()) {
    /* No preloaded sprite to work with; read the
     * pseudo sprite content. */
    _cur.file->ReadBlock(buf, num);
  } else {
    /* Use the preloaded sprite data. */
    buf = _grf_line_to_action6_sprite_override[location];
    grfmsg(7, "DecodeSpecialSprite: Using preloaded pseudo sprite data");
 
    /* Skip the real (original) content of this action. */
    _cur.file->SeekTo(num, SEEK_CUR);
  }
 
  ByteReader br(buf, buf + num);
  ByteReader *bufp = &br;
 
  try {
    byte action = bufp->ReadByte();
 
    if (action == 0xFF) {
      grfmsg(2, "DecodeSpecialSprite: Unexpected data block, skipping");
    } else if (action == 0xFE) {
      grfmsg(2, "DecodeSpecialSprite: Unexpected import block, skipping");
    } else if (action >= lengthof(handlers)) {
      grfmsg(7, "DecodeSpecialSprite: Skipping unknown action 0x%02X", action);
    } else if (handlers[action][stage] == nullptr) {
      grfmsg(7, "DecodeSpecialSprite: Skipping action 0x%02X in stage %d", action, stage);
    } else {
      grfmsg(7, "DecodeSpecialSprite: Handling action 0x%02X in stage %d", action, stage);
      handlers[action][stage](bufp);
    }
  } catch (...) {
    grfmsg(1, "DecodeSpecialSprite: Tried to read past end of pseudo-sprite data");
    DisableGrf(STR_NEWGRF_ERROR_READ_BOUNDS);
  }
}
 
static void LoadNewGRFFileFromFile(GRFConfig *config, GrfLoadingStage stage, SpriteFile &file)
{
  _cur.file = &file;
  _cur.grfconfig = config;
 
  Debug(grf, 2, "LoadNewGRFFile: Reading NewGRF-file '{}'", config->filename);
 
  byte grf_container_version = file.GetContainerVersion();
  if (grf_container_version == 0) {
    Debug(grf, 7, "LoadNewGRFFile: Custom .grf has invalid format");
    return;
  }
 
  if (stage == GLS_INIT || stage == GLS_ACTIVATION) {
    /* We need the sprite offsets in the init stage for NewGRF sounds
     * and in the activation stage for real sprites. */
    ReadGRFSpriteOffsets(file);
  } else {
    /* Skip sprite section offset if present. */
    if (grf_container_version >= 2) file.ReadDword();
  }
 
  if (grf_container_version >= 2) {
    /* Read compression value. */
    byte compression = file.ReadByte();
    if (compression != 0) {
      Debug(grf, 7, "LoadNewGRFFile: Unsupported compression format");
      return;
    }
  }
 
  /* Skip the first sprite; we don't care about how many sprites this
   * does contain; newest TTDPatches and George's longvehicles don't
   * neither, apparently. */
  uint32 num = grf_container_version >= 2 ? file.ReadDword() : file.ReadWord();
  if (num == 4 && file.ReadByte() == 0xFF) {
    file.ReadDword();
  } else {
    Debug(grf, 7, "LoadNewGRFFile: Custom .grf has invalid format");
    return;
  }
 
  _cur.ClearDataForNextFile();
 
  ReusableBuffer<byte> buf;
 
  while ((num = (grf_container_version >= 2 ? file.ReadDword() : file.ReadWord())) != 0) {
    byte type = file.ReadByte();
    _cur.nfo_line++;
 
    if (type == 0xFF) {
      if (_cur.skip_sprites == 0) {
        DecodeSpecialSprite(buf.Allocate(num), num, stage);
 
        /* Stop all processing if we are to skip the remaining sprites */
        if (_cur.skip_sprites == -1) break;
 
        continue;
      } else {
        file.SkipBytes(num);
      }
    } else {
      if (_cur.skip_sprites == 0) {
        grfmsg(0, "LoadNewGRFFile: Unexpected sprite, disabling");
        DisableGrf(STR_NEWGRF_ERROR_UNEXPECTED_SPRITE);
        break;
      }
 
      if (grf_container_version >= 2 && type == 0xFD) {
        /* Reference to data section. Container version >= 2 only. */
        file.SkipBytes(num);
      } else {
        file.SkipBytes(7);
        SkipSpriteData(file, type, num - 8);
      }
    }
 
    if (_cur.skip_sprites > 0) _cur.skip_sprites--;
  }
}
 
void LoadNewGRFFile(GRFConfig *config, GrfLoadingStage stage, Subdirectory subdir, bool temporary)
{
  const char *filename = config->filename;
 
  /* A .grf file is activated only if it was active when the game was
   * started.  If a game is loaded, only its active .grfs will be
   * reactivated, unless "loadallgraphics on" is used.  A .grf file is
   * considered active if its action 8 has been processed, i.e. its
   * action 8 hasn't been skipped using an action 7.
   *
   * During activation, only actions 0, 1, 2, 3, 4, 5, 7, 8, 9, 0A and 0B are
   * carried out.  All others are ignored, because they only need to be
   * processed once at initialization.  */
  if (stage != GLS_FILESCAN && stage != GLS_SAFETYSCAN && stage != GLS_LABELSCAN) {
    _cur.grffile = GetFileByFilename(filename);
    if (_cur.grffile == nullptr) usererror("File '%s' lost in cache.\n", filename);
    if (stage == GLS_RESERVE && config->status != GCS_INITIALISED) return;
    if (stage == GLS_ACTIVATION && !HasBit(config->flags, GCF_RESERVED)) return;
  }
 
  bool needs_palette_remap = config->palette & GRFP_USE_MASK;
  if (temporary) {
    SpriteFile temporarySpriteFile(filename, subdir, needs_palette_remap);
    LoadNewGRFFileFromFile(config, stage, temporarySpriteFile);
  } else {
    LoadNewGRFFileFromFile(config, stage, OpenCachedSpriteFile(filename, subdir, needs_palette_remap));
  }
}
 
static void ActivateOldShore()
{
  /* Use default graphics, if no shore sprites were loaded.
   * Should not happen, as the base set's extra grf should include some. */
  if (_loaded_newgrf_features.shore == SHORE_REPLACE_NONE) _loaded_newgrf_features.shore = SHORE_REPLACE_ACTION_A;
 
  if (_loaded_newgrf_features.shore != SHORE_REPLACE_ACTION_5) {
    DupSprite(SPR_ORIGINALSHORE_START +  1, SPR_SHORE_BASE +  1); // SLOPE_W
    DupSprite(SPR_ORIGINALSHORE_START +  2, SPR_SHORE_BASE +  2); // SLOPE_S
    DupSprite(SPR_ORIGINALSHORE_START +  6, SPR_SHORE_BASE +  3); // SLOPE_SW
    DupSprite(SPR_ORIGINALSHORE_START +  0, SPR_SHORE_BASE +  4); // SLOPE_E
    DupSprite(SPR_ORIGINALSHORE_START +  4, SPR_SHORE_BASE +  6); // SLOPE_SE
    DupSprite(SPR_ORIGINALSHORE_START +  3, SPR_SHORE_BASE +  8); // SLOPE_N
    DupSprite(SPR_ORIGINALSHORE_START +  7, SPR_SHORE_BASE +  9); // SLOPE_NW
    DupSprite(SPR_ORIGINALSHORE_START +  5, SPR_SHORE_BASE + 12); // SLOPE_NE
  }
 
  if (_loaded_newgrf_features.shore == SHORE_REPLACE_ACTION_A) {
    DupSprite(SPR_FLAT_GRASS_TILE + 16, SPR_SHORE_BASE +  0); // SLOPE_STEEP_S
    DupSprite(SPR_FLAT_GRASS_TILE + 17, SPR_SHORE_BASE +  5); // SLOPE_STEEP_W
    DupSprite(SPR_FLAT_GRASS_TILE +  7, SPR_SHORE_BASE +  7); // SLOPE_WSE
    DupSprite(SPR_FLAT_GRASS_TILE + 15, SPR_SHORE_BASE + 10); // SLOPE_STEEP_N
    DupSprite(SPR_FLAT_GRASS_TILE + 11, SPR_SHORE_BASE + 11); // SLOPE_NWS
    DupSprite(SPR_FLAT_GRASS_TILE + 13, SPR_SHORE_BASE + 13); // SLOPE_ENW
    DupSprite(SPR_FLAT_GRASS_TILE + 14, SPR_SHORE_BASE + 14); // SLOPE_SEN
    DupSprite(SPR_FLAT_GRASS_TILE + 18, SPR_SHORE_BASE + 15); // SLOPE_STEEP_E
 
    /* XXX - SLOPE_EW, SLOPE_NS are currently not used.
     *       If they would be used somewhen, then these grass tiles will most like not look as needed */
    DupSprite(SPR_FLAT_GRASS_TILE +  5, SPR_SHORE_BASE + 16); // SLOPE_EW
    DupSprite(SPR_FLAT_GRASS_TILE + 10, SPR_SHORE_BASE + 17); // SLOPE_NS
  }
}
 
static void ActivateOldTramDepot()
{
  if (_loaded_newgrf_features.tram == TRAMWAY_REPLACE_DEPOT_WITH_TRACK) {
    DupSprite(SPR_ROAD_DEPOT               + 0, SPR_TRAMWAY_DEPOT_NO_TRACK + 0); // use road depot graphics for "no tracks"
    DupSprite(SPR_TRAMWAY_DEPOT_WITH_TRACK + 1, SPR_TRAMWAY_DEPOT_NO_TRACK + 1);
    DupSprite(SPR_ROAD_DEPOT               + 2, SPR_TRAMWAY_DEPOT_NO_TRACK + 2); // use road depot graphics for "no tracks"
    DupSprite(SPR_TRAMWAY_DEPOT_WITH_TRACK + 3, SPR_TRAMWAY_DEPOT_NO_TRACK + 3);
    DupSprite(SPR_TRAMWAY_DEPOT_WITH_TRACK + 4, SPR_TRAMWAY_DEPOT_NO_TRACK + 4);
    DupSprite(SPR_TRAMWAY_DEPOT_WITH_TRACK + 5, SPR_TRAMWAY_DEPOT_NO_TRACK + 5);
  }
}
 
static void FinalisePriceBaseMultipliers()
{
  extern const PriceBaseSpec _price_base_specs[];
  static const uint32 override_features = (1 << GSF_TRAINS) | (1 << GSF_ROADVEHICLES) | (1 << GSF_SHIPS) | (1 << GSF_AIRCRAFT);
 
  /* Evaluate grf overrides */
  int num_grfs = (uint)_grf_files.size();
  int *grf_overrides = AllocaM(int, num_grfs);
  for (int i = 0; i < num_grfs; i++) {
    grf_overrides[i] = -1;
 
    GRFFile *source = _grf_files[i];
    uint32 override = _grf_id_overrides[source->grfid];
    if (override == 0) continue;
 
    GRFFile *dest = GetFileByGRFID(override);
    if (dest == nullptr) continue;
 
    grf_overrides[i] = find_index(_grf_files, dest);
    assert(grf_overrides[i] >= 0);
  }
 
  /* Override features and price base multipliers of earlier loaded grfs */
  for (int i = 0; i < num_grfs; i++) {
    if (grf_overrides[i] < 0 || grf_overrides[i] >= i) continue;
    GRFFile *source = _grf_files[i];
    GRFFile *dest = _grf_files[grf_overrides[i]];
 
    uint32 features = (source->grf_features | dest->grf_features) & override_features;
    source->grf_features |= features;
    dest->grf_features |= features;
 
    for (Price p = PR_BEGIN; p < PR_END; p++) {
      /* No price defined -> nothing to do */
      if (!HasBit(features, _price_base_specs[p].grf_feature) || source->price_base_multipliers[p] == INVALID_PRICE_MODIFIER) continue;
      Debug(grf, 3, "'{}' overrides price base multiplier {} of '{}'", source->filename, p, dest->filename);
      dest->price_base_multipliers[p] = source->price_base_multipliers[p];
    }
  }
 
  /* Propagate features and price base multipliers of afterwards loaded grfs, if none is present yet */
  for (int i = num_grfs - 1; i >= 0; i--) {
    if (grf_overrides[i] < 0 || grf_overrides[i] <= i) continue;
    GRFFile *source = _grf_files[i];
    GRFFile *dest = _grf_files[grf_overrides[i]];
 
    uint32 features = (source->grf_features | dest->grf_features) & override_features;
    source->grf_features |= features;
    dest->grf_features |= features;
 
    for (Price p = PR_BEGIN; p < PR_END; p++) {
      /* Already a price defined -> nothing to do */
      if (!HasBit(features, _price_base_specs[p].grf_feature) || dest->price_base_multipliers[p] != INVALID_PRICE_MODIFIER) continue;
      Debug(grf, 3, "Price base multiplier {} from '{}' propagated to '{}'", p, source->filename, dest->filename);
      dest->price_base_multipliers[p] = source->price_base_multipliers[p];
    }
  }
 
  /* The 'master grf' now have the correct multipliers. Assign them to the 'addon grfs' to make everything consistent. */
  for (int i = 0; i < num_grfs; i++) {
    if (grf_overrides[i] < 0) continue;
    GRFFile *source = _grf_files[i];
    GRFFile *dest = _grf_files[grf_overrides[i]];
 
    uint32 features = (source->grf_features | dest->grf_features) & override_features;
    source->grf_features |= features;
    dest->grf_features |= features;
 
    for (Price p = PR_BEGIN; p < PR_END; p++) {
      if (!HasBit(features, _price_base_specs[p].grf_feature)) continue;
      if (source->price_base_multipliers[p] != dest->price_base_multipliers[p]) {
        Debug(grf, 3, "Price base multiplier {} from '{}' propagated to '{}'", p, dest->filename, source->filename);
      }
      source->price_base_multipliers[p] = dest->price_base_multipliers[p];
    }
  }
 
  /* Apply fallback prices for grf version < 8 */
  for (GRFFile * const file : _grf_files) {
    if (file->grf_version >= 8) continue;
    PriceMultipliers &price_base_multipliers = file->price_base_multipliers;
    for (Price p = PR_BEGIN; p < PR_END; p++) {
      Price fallback_price = _price_base_specs[p].fallback_price;
      if (fallback_price != INVALID_PRICE && price_base_multipliers[p] == INVALID_PRICE_MODIFIER) {
        /* No price multiplier has been set.
         * So copy the multiplier from the fallback price, maybe a multiplier was set there. */
        price_base_multipliers[p] = price_base_multipliers[fallback_price];
      }
    }
  }
 
  /* Decide local/global scope of price base multipliers */
  for (GRFFile * const file : _grf_files) {
    PriceMultipliers &price_base_multipliers = file->price_base_multipliers;
    for (Price p = PR_BEGIN; p < PR_END; p++) {
      if (price_base_multipliers[p] == INVALID_PRICE_MODIFIER) {
        /* No multiplier was set; set it to a neutral value */
        price_base_multipliers[p] = 0;
      } else {
        if (!HasBit(file->grf_features, _price_base_specs[p].grf_feature)) {
          /* The grf does not define any objects of the feature,
           * so it must be a difficulty setting. Apply it globally */
          Debug(grf, 3, "'{}' sets global price base multiplier {}", file->filename, p);
          SetPriceBaseMultiplier(p, price_base_multipliers[p]);
          price_base_multipliers[p] = 0;
        } else {
          Debug(grf, 3, "'{}' sets local price base multiplier {}", file->filename, p);
        }
      }
    }
  }
}
 
extern void InitGRFTownGeneratorNames();
 
static void AfterLoadGRFs()
{
  for (StringIDMapping &it : _string_to_grf_mapping) {
    *it.target = MapGRFStringID(it.grfid, it.source);
  }
  _string_to_grf_mapping.clear();
 
  /* Free the action 6 override sprites. */
  for (GRFLineToSpriteOverride::iterator it = _grf_line_to_action6_sprite_override.begin(); it != _grf_line_to_action6_sprite_override.end(); it++) {
    free((*it).second);
  }
  _grf_line_to_action6_sprite_override.clear();
 
  /* Polish cargoes */
  FinaliseCargoArray();
 
  /* Pre-calculate all refit masks after loading GRF files. */
  CalculateRefitMasks();
 
  /* Polish engines */
  FinaliseEngineArray();
 
  /* Set the actually used Canal properties */
  FinaliseCanals();
 
  /* Add all new houses to the house array. */
  FinaliseHouseArray();
 
  /* Add all new industries to the industry array. */
  FinaliseIndustriesArray();
 
  /* Add all new objects to the object array. */
  FinaliseObjectsArray();
 
  InitializeSortedCargoSpecs();
 
  /* Sort the list of industry types. */
  SortIndustryTypes();
 
  /* Create dynamic list of industry legends for smallmap_gui.cpp */
  BuildIndustriesLegend();
 
  /* Build the routemap legend, based on the available cargos */
  BuildLinkStatsLegend();
 
  /* Add all new airports to the airports array. */
  FinaliseAirportsArray();
  BindAirportSpecs();
 
  /* Update the townname generators list */
  InitGRFTownGeneratorNames();
 
  /* Run all queued vehicle list order changes */
  CommitVehicleListOrderChanges();
 
  /* Load old shore sprites in new position, if they were replaced by ActionA */
  ActivateOldShore();
 
  /* Load old tram depot sprites in new position, if no new ones are present */
  ActivateOldTramDepot();
 
  /* Set up custom rail types */
  InitRailTypes();
  InitRoadTypes();
 
  for (Engine *e : Engine::IterateType(VEH_ROAD)) {
    if (_gted[e->index].rv_max_speed != 0) {
      /* Set RV maximum speed from the mph/0.8 unit value */
      e->u.road.max_speed = _gted[e->index].rv_max_speed * 4;
    }
 
    RoadTramType rtt = HasBit(e->info.misc_flags, EF_ROAD_TRAM) ? RTT_TRAM : RTT_ROAD;
 
    const GRFFile *file = e->GetGRF();
    if (file == nullptr || _gted[e->index].roadtramtype == 0) {
      e->u.road.roadtype = (rtt == RTT_TRAM) ? ROADTYPE_TRAM : ROADTYPE_ROAD;
      continue;
    }
 
    /* Remove +1 offset. */
    _gted[e->index].roadtramtype--;
 
    const std::vector<RoadTypeLabel> *list = (rtt == RTT_TRAM) ? &file->tramtype_list : &file->roadtype_list;
    if (_gted[e->index].roadtramtype < list->size())
    {
      RoadTypeLabel rtl = (*list)[_gted[e->index].roadtramtype];
      RoadType rt = GetRoadTypeByLabel(rtl);
      if (rt != INVALID_ROADTYPE && GetRoadTramType(rt) == rtt) {
        e->u.road.roadtype = rt;
        continue;
      }
    }
 
    /* Road type is not available, so disable this engine */
    e->info.climates = 0;
  }
 
  for (Engine *e : Engine::IterateType(VEH_TRAIN)) {
    RailType railtype = GetRailTypeByLabel(_gted[e->index].railtypelabel);
    if (railtype == INVALID_RAILTYPE) {
      /* Rail type is not available, so disable this engine */
      e->info.climates = 0;
    } else {
      e->u.rail.railtype = railtype;
      e->u.rail.intended_railtype = railtype;
    }
  }
 
  SetYearEngineAgingStops();
 
  FinalisePriceBaseMultipliers();
 
  /* Deallocate temporary loading data */
  free(_gted);
  _grm_sprites.clear();
}
 
void LoadNewGRF(uint load_index, uint num_baseset)
{
  /* In case of networking we need to "sync" the start values
   * so all NewGRFs are loaded equally. For this we use the
   * start date of the game and we set the counters, etc. to
   * 0 so they're the same too. */
  Date date            = _date;
  Year year            = _cur_year;
  DateFract date_fract = _date_fract;
  uint64 tick_counter  = _tick_counter;
  byte display_opt     = _display_opt;
 
  if (_networking) {
    _cur_year     = _settings_game.game_creation.starting_year;
    _date         = ConvertYMDToDate(_cur_year, 0, 1);
    _date_fract   = 0;
    _tick_counter = 0;
    _display_opt  = 0;
  }
 
  InitializeGRFSpecial();
 
  ResetNewGRFData();
 
  /*
   * Reset the status of all files, so we can 'retry' to load them.
   * This is needed when one for example rearranges the NewGRFs in-game
   * and a previously disabled NewGRF becomes usable. If it would not
   * be reset, the NewGRF would remain disabled even though it should
   * have been enabled.
   */
  for (GRFConfig *c = _grfconfig; c != nullptr; c = c->next) {
    if (c->status != GCS_NOT_FOUND) c->status = GCS_UNKNOWN;
  }
 
  _cur.spriteid = load_index;
 
  /* Load newgrf sprites
   * in each loading stage, (try to) open each file specified in the config
   * and load information from it. */
  for (GrfLoadingStage stage = GLS_LABELSCAN; stage <= GLS_ACTIVATION; stage++) {
    /* Set activated grfs back to will-be-activated between reservation- and activation-stage.
     * This ensures that action7/9 conditions 0x06 - 0x0A work correctly. */
    for (GRFConfig *c = _grfconfig; c != nullptr; c = c->next) {
      if (c->status == GCS_ACTIVATED) c->status = GCS_INITIALISED;
    }
 
    if (stage == GLS_RESERVE) {
      static const uint32 overrides[][2] = {
        { 0x44442202, 0x44440111 }, // UKRS addons modifies UKRS
        { 0x6D620402, 0x6D620401 }, // DBSetXL ECS extension modifies DBSetXL
        { 0x4D656f20, 0x4D656F17 }, // LV4cut modifies LV4
      };
      for (size_t i = 0; i < lengthof(overrides); i++) {
        SetNewGRFOverride(BSWAP32(overrides[i][0]), BSWAP32(overrides[i][1]));
      }
    }
 
    uint num_grfs = 0;
    uint num_non_static = 0;
 
    _cur.stage = stage;
    for (GRFConfig *c = _grfconfig; c != nullptr; c = c->next) {
      if (c->status == GCS_DISABLED || c->status == GCS_NOT_FOUND) continue;
      if (stage > GLS_INIT && HasBit(c->flags, GCF_INIT_ONLY)) continue;
 
      Subdirectory subdir = num_grfs < num_baseset ? BASESET_DIR : NEWGRF_DIR;
      if (!FioCheckFileExists(c->filename, subdir)) {
        Debug(grf, 0, "NewGRF file is missing '{}'; disabling", c->filename);
        c->status = GCS_NOT_FOUND;
        continue;
      }
 
      if (stage == GLS_LABELSCAN) InitNewGRFFile(c);
 
      if (!HasBit(c->flags, GCF_STATIC) && !HasBit(c->flags, GCF_SYSTEM)) {
        if (num_non_static == NETWORK_MAX_GRF_COUNT) {
          Debug(grf, 0, "'{}' is not loaded as the maximum number of non-static GRFs has been reached", c->filename);
          c->status = GCS_DISABLED;
          c->error  = new GRFError(STR_NEWGRF_ERROR_MSG_FATAL, STR_NEWGRF_ERROR_TOO_MANY_NEWGRFS_LOADED);
          continue;
        }
        num_non_static++;
      }
 
      num_grfs++;
 
      LoadNewGRFFile(c, stage, subdir, false);
      if (stage == GLS_RESERVE) {
        SetBit(c->flags, GCF_RESERVED);
      } else if (stage == GLS_ACTIVATION) {
        ClrBit(c->flags, GCF_RESERVED);
        assert(GetFileByGRFID(c->ident.grfid) == _cur.grffile);
        ClearTemporaryNewGRFData(_cur.grffile);
        BuildCargoTranslationMap();
        Debug(sprite, 2, "LoadNewGRF: Currently {} sprites are loaded", _cur.spriteid);
      } else if (stage == GLS_INIT && HasBit(c->flags, GCF_INIT_ONLY)) {
        /* We're not going to activate this, so free whatever data we allocated */
        ClearTemporaryNewGRFData(_cur.grffile);
      }
    }
  }
 
  /* Pseudo sprite processing is finished; free temporary stuff */
  _cur.ClearDataForNextFile();
 
  /* Call any functions that should be run after GRFs have been loaded. */
  AfterLoadGRFs();
 
  /* Now revert back to the original situation */
  _cur_year     = year;
  _date         = date;
  _date_fract   = date_fract;
  _tick_counter = tick_counter;
  _display_opt  = display_opt;
}