virtual bool Load(const char *pMapName, IStorage *pStorage)
{
if(!pStorage)
pStorage = Kernel()->RequestInterface<IStorage>();
if(!pStorage)
return false;
if(!m_DataFile.Open(pStorage, pMapName, IStorage::TYPE_ALL))
return false;
// check version
CMapItemVersion *pItem = (CMapItemVersion *)m_DataFile.FindItem(MAPITEMTYPE_VERSION, 0);
if(!pItem || pItem->m_Version != CMapItemVersion::CURRENT_VERSION)
return false;
// replace compressed tile layers with uncompressed ones
int GroupsStart, GroupsNum, LayersStart, LayersNum;
m_DataFile.GetType(MAPITEMTYPE_GROUP, &GroupsStart, &GroupsNum);
m_DataFile.GetType(MAPITEMTYPE_LAYER, &LayersStart, &LayersNum);
for(int g = 0; g < GroupsNum; g++)
{
CMapItemGroup *pGroup = static_cast<CMapItemGroup *>(m_DataFile.GetItem(GroupsStart + g, 0, 0));
for(int l = 0; l < pGroup->m_NumLayers; l++)
{
CMapItemLayer *pLayer = static_cast<CMapItemLayer *>(m_DataFile.GetItem(LayersStart + pGroup->m_StartLayer + l, 0, 0));
if(pLayer->m_Type == LAYERTYPE_TILES)
{
CMapItemLayerTilemap *pTilemap = reinterpret_cast<CMapItemLayerTilemap *>(pLayer);
if(pTilemap->m_Version > 3)
{
const int TilemapCount = pTilemap->m_Width * pTilemap->m_Height;
const int TilemapSize = TilemapCount * sizeof(CTile);
if((TilemapCount / pTilemap->m_Width != pTilemap->m_Height) || (TilemapSize / (int)sizeof(CTile) != TilemapCount))
{
dbg_msg("engine", "map layer too big (%d * %d * %u causes an integer overflow)", pTilemap->m_Width, pTilemap->m_Height, unsigned(sizeof(CTile)));
return false;
}
CTile *pTiles = static_cast<CTile *>(mem_alloc(TilemapSize, 1));
if(!pTiles)
return false;
// extract original tile data
int i = 0;
CTile *pSavedTiles = static_cast<CTile *>(m_DataFile.GetData(pTilemap->m_Data));
while(i < TilemapCount)
{
for(unsigned Counter = 0; Counter <= pSavedTiles->m_Skip && i < TilemapCount; Counter++)
{
pTiles[i] = *pSavedTiles;
pTiles[i++].m_Skip = 0;
}
pSavedTiles++;
}
m_DataFile.ReplaceData(pTilemap->m_Data, reinterpret_cast<char *>(pTiles));
}
}
}
}
return true;
}
