Method LoadChunkFromData

src/WorldStorage/WSSCompact.cpp:842–913

bool cWSSCompact::LoadChunkFromData(const cChunkCoords & a_Chunk, int & a_UncompressedSize, const AString & a_Data, cWorld * a_World)
{
	// Crude data integrity check:
	if (a_UncompressedSize < cChunkDef::BlockDataSize)
	{
		LOGWARNING("Chunk [%d, %d] has too short decompressed data (%d bytes out of %d needed), erasing",
			a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ,
			a_UncompressedSize, cChunkDef::BlockDataSize
		);
		EraseChunkData(a_Chunk);
		return false;
	}
	
	// Decompress the data:
	AString UncompressedData;
	int errorcode = UncompressString(a_Data.data(), a_Data.size(), UncompressedData, a_UncompressedSize);
	if (errorcode != Z_OK)
	{
		LOGERROR("Error %d decompressing data for chunk [%d, %d]", 
			errorcode,
			a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ
		);
		return false;
	}
	
	if (a_UncompressedSize != (int)UncompressedData.size())
	{
		LOGWARNING("Uncompressed data size differs (exp %d bytes, got " SIZE_T_FMT  ") for chunk [%d, %d]",
			a_UncompressedSize, UncompressedData.size(),
			a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ
		);
		return false;
	}

	cEntityList      Entities;
	cBlockEntityList BlockEntities;
	bool IsLightValid = false;
	
	if (a_UncompressedSize > cChunkDef::BlockDataSize)
	{
		Json::Value root;   // will contain the root value after parsing.
		Json::Reader reader;
		if ( !reader.parse( UncompressedData.data() + cChunkDef::BlockDataSize, root, false ) )
		{
			LOGERROR("Failed to parse trailing JSON in chunk [%d, %d]!",
				a_Chunk.m_ChunkX, a_Chunk.m_ChunkZ
			);
		}
		else
		{
			LoadEntitiesFromJson(root, Entities, BlockEntities, a_World);
			IsLightValid = root.get("IsLightValid", false).asBool();
		}
	}

	BLOCKTYPE *  BlockData  = (BLOCKTYPE *)UncompressedData.data();
	NIBBLETYPE * MetaData   = (NIBBLETYPE *)(BlockData + MetaOffset);
	NIBBLETYPE * BlockLight = (NIBBLETYPE *)(BlockData + LightOffset);