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Diffstat (limited to '')
| -rw-r--r-- | source/ChunkDataSerializer.cpp | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/source/ChunkDataSerializer.cpp b/source/ChunkDataSerializer.cpp new file mode 100644 index 000000000..1d798beb2 --- /dev/null +++ b/source/ChunkDataSerializer.cpp @@ -0,0 +1,118 @@ +
+// 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;
+ // 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('\xff');
+
+ // 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);
+}
+
+
+
+
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