1 files changed, 176 insertions, 0 deletions

diff --git a/src/Protocol/ChunkDataSerializer.cpp b/src/Protocol/ChunkDataSerializer.cpp
new file mode 100644
index 000000000..2a9230fee
--- /dev/null
+++ b/src/Protocol/ChunkDataSerializer.cpp
@@ -0,0 +1,176 @@
+
+// ChunkDataSerializer.cpp
+
+// Implements the cChunkDataSerializer class representing the object that can:
+//  - serialize chunk data to different protocol versions
+//  - cache such serialized data for multiple clients
+
+#include "Globals.h"
+#include "ChunkDataSerializer.h"
+#include "zlib.h"
+
+
+
+
+cChunkDataSerializer::cChunkDataSerializer(
+	const cChunkDef::BlockTypes   & a_BlockTypes,
+	const cChunkDef::BlockNibbles & a_BlockMetas,
+	const cChunkDef::BlockNibbles & a_BlockLight,
+	const cChunkDef::BlockNibbles & a_BlockSkyLight,
+	const unsigned char *           a_BiomeData
+) :
+	m_BlockTypes(a_BlockTypes),
+	m_BlockMetas(a_BlockMetas),
+	m_BlockLight(a_BlockLight),
+	m_BlockSkyLight(a_BlockSkyLight),
+	m_BiomeData(a_BiomeData)
+{
+}
+
+
+
+
+const AString & cChunkDataSerializer::Serialize(int a_Version)
+{
+	Serializations::const_iterator itr = m_Serializations.find(a_Version);
+	if (itr != m_Serializations.end())
+	{
+		return itr->second;
+	}
+	
+	AString data;
+	switch (a_Version)
+	{
+		case RELEASE_1_2_5: Serialize29(data); break;
+		case RELEASE_1_3_2: Serialize39(data); break;
+		// TODO: Other protocol versions may serialize the data differently; implement here
+		
+		default:
+		{
+			LOGERROR("cChunkDataSerializer::Serialize(): Unknown version: %d", a_Version);
+			ASSERT(!"Unknown chunk data serialization version");
+			break;
+		}
+	}
+	m_Serializations[a_Version] = data;
+	return m_Serializations[a_Version];
+}
+
+
+
+
+
+void cChunkDataSerializer::Serialize29(AString & a_Data)
+{
+	// TODO: Do not copy data and then compress it; rather, compress partial blocks of data (zlib *can* stream)
+
+	const int BiomeDataSize    = cChunkDef::Width * cChunkDef::Width;
+	const int MetadataOffset   = sizeof(m_BlockTypes);
+	const int BlockLightOffset = MetadataOffset   + sizeof(m_BlockMetas);
+	const int SkyLightOffset   = BlockLightOffset + sizeof(m_BlockLight);
+	const int BiomeOffset      = SkyLightOffset   + sizeof(m_BlockSkyLight);
+	const int DataSize         = BiomeOffset      + BiomeDataSize;
+	
+	// Temporary buffer for the composed data:
+	char AllData [DataSize];
+
+	memcpy(AllData, m_BlockTypes, sizeof(m_BlockTypes));
+	memcpy(AllData + MetadataOffset,   m_BlockMetas,    sizeof(m_BlockMetas));
+	memcpy(AllData + BlockLightOffset, m_BlockLight,    sizeof(m_BlockLight));
+	memcpy(AllData + SkyLightOffset,   m_BlockSkyLight, sizeof(m_BlockSkyLight));
+	memcpy(AllData + BiomeOffset,      m_BiomeData,     BiomeDataSize);
+
+	// Compress the data:
+	// In order not to use allocation, use a fixed-size buffer, with the size
+	// that uses the same calculation as compressBound():
+	const uLongf CompressedMaxSize = DataSize + (DataSize >> 12) + (DataSize >> 14) + (DataSize >> 25) + 16;
+	char CompressedBlockData[CompressedMaxSize];
+
+	uLongf CompressedSize = compressBound(DataSize);
+	
+	// Run-time check that our compile-time guess about CompressedMaxSize was enough:
+	ASSERT(CompressedSize <= CompressedMaxSize);
+	
+	compress2((Bytef*)CompressedBlockData, &CompressedSize, (const Bytef*)AllData, sizeof(AllData), Z_DEFAULT_COMPRESSION);
+
+	// Now put all those data into a_Data:
+	
+	// "Ground-up continuous", or rather, "biome data present" flag:
+	a_Data.push_back('\x01');
+	
+	// Two bitmaps; we're aways sending the full chunk with no additional data, so the bitmaps are 0xffff and 0, respectively
+	// Also, no endian flipping is needed because of the const values
+	unsigned short BitMap1 = 0xffff;
+	unsigned short BitMap2 = 0;
+	a_Data.append((const char *)&BitMap1, sizeof(short));
+	a_Data.append((const char *)&BitMap2, sizeof(short));
+	
+	Int32 CompressedSizeBE = htonl(CompressedSize);
+	a_Data.append((const char *)&CompressedSizeBE, sizeof(CompressedSizeBE));
+	
+	Int32 UnusedInt32 = 0;
+	a_Data.append((const char *)&UnusedInt32,      sizeof(UnusedInt32));
+	
+	a_Data.append(CompressedBlockData, CompressedSize);
+}
+
+
+
+
+
+void cChunkDataSerializer::Serialize39(AString & a_Data)
+{
+	// TODO: Do not copy data and then compress it; rather, compress partial blocks of data (zlib *can* stream)
+
+	const int BiomeDataSize    = cChunkDef::Width * cChunkDef::Width;
+	const int MetadataOffset   = sizeof(m_BlockTypes);
+	const int BlockLightOffset = MetadataOffset   + sizeof(m_BlockMetas);
+	const int SkyLightOffset   = BlockLightOffset + sizeof(m_BlockLight);
+	const int BiomeOffset      = SkyLightOffset   + sizeof(m_BlockSkyLight);
+	const int DataSize         = BiomeOffset      + BiomeDataSize;
+	
+	// Temporary buffer for the composed data:
+	char AllData [DataSize];
+
+	memcpy(AllData, m_BlockTypes, sizeof(m_BlockTypes));
+	memcpy(AllData + MetadataOffset,   m_BlockMetas,    sizeof(m_BlockMetas));
+	memcpy(AllData + BlockLightOffset, m_BlockLight,    sizeof(m_BlockLight));
+	memcpy(AllData + SkyLightOffset,   m_BlockSkyLight, sizeof(m_BlockSkyLight));
+	memcpy(AllData + BiomeOffset,      m_BiomeData,     BiomeDataSize);
+
+	// Compress the data:
+	// In order not to use allocation, use a fixed-size buffer, with the size
+	// that uses the same calculation as compressBound():
+	const uLongf CompressedMaxSize = DataSize + (DataSize >> 12) + (DataSize >> 14) + (DataSize >> 25) + 16;
+	char CompressedBlockData[CompressedMaxSize];
+
+	uLongf CompressedSize = compressBound(DataSize);
+	
+	// Run-time check that our compile-time guess about CompressedMaxSize was enough:
+	ASSERT(CompressedSize <= CompressedMaxSize);
+	
+	compress2((Bytef*)CompressedBlockData, &CompressedSize, (const Bytef*)AllData, sizeof(AllData), Z_DEFAULT_COMPRESSION);
+
+	// Now put all those data into a_Data:
+	
+	// "Ground-up continuous", or rather, "biome data present" flag:
+	a_Data.push_back('\x01');
+	
+	// Two bitmaps; we're aways sending the full chunk with no additional data, so the bitmaps are 0xffff and 0, respectively
+	// Also, no endian flipping is needed because of the const values
+	unsigned short BitMap1 = 0xffff;
+	unsigned short BitMap2 = 0;
+	a_Data.append((const char *)&BitMap1, sizeof(short));
+	a_Data.append((const char *)&BitMap2, sizeof(short));
+	
+	Int32 CompressedSizeBE = htonl(CompressedSize);
+	a_Data.append((const char *)&CompressedSizeBE, sizeof(CompressedSizeBE));
+	
+	// Unlike 29, 39 doesn't have the "unused" int
+	
+	a_Data.append(CompressedBlockData, CompressedSize);
+}
+
+
+
+