252 lines
8.3 KiB
C++
252 lines
8.3 KiB
C++
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// ChunkDataSerializer.cpp
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// Implements the cChunkDataSerializer class representing the object that can:
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// - serialize chunk data to different protocol versions
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// - cache such serialized data for multiple clients
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#include "Globals.h"
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#include "ChunkDataSerializer.h"
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#include "zlib/zlib.h"
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#include "ByteBuffer.h"
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#include "Protocol18x.h"
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cChunkDataSerializer::cChunkDataSerializer(
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const cChunkDef::BlockTypes & a_BlockTypes,
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const cChunkDef::BlockNibbles & a_BlockMetas,
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const cChunkDef::BlockNibbles & a_BlockLight,
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const cChunkDef::BlockNibbles & a_BlockSkyLight,
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const unsigned char * a_BiomeData
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) :
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m_BlockTypes(a_BlockTypes),
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m_BlockMetas(a_BlockMetas),
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m_BlockLight(a_BlockLight),
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m_BlockSkyLight(a_BlockSkyLight),
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m_BiomeData(a_BiomeData)
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{
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}
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const AString & cChunkDataSerializer::Serialize(int a_Version, int a_ChunkX, int a_ChunkZ)
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{
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Serializations::const_iterator itr = m_Serializations.find(a_Version);
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if (itr != m_Serializations.end())
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{
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return itr->second;
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}
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AString data;
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switch (a_Version)
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{
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case RELEASE_1_2_5: Serialize29(data); break;
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case RELEASE_1_3_2: Serialize39(data); break;
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case RELEASE_1_8_0: Serialize47(data, a_ChunkX, a_ChunkZ); break;
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// TODO: Other protocol versions may serialize the data differently; implement here
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default:
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{
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LOGERROR("cChunkDataSerializer::Serialize(): Unknown version: %d", a_Version);
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ASSERT(!"Unknown chunk data serialization version");
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break;
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}
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}
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if (!data.empty())
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{
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m_Serializations[a_Version] = data;
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}
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return m_Serializations[a_Version];
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}
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void cChunkDataSerializer::Serialize29(AString & a_Data)
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{
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// TODO: Do not copy data and then compress it; rather, compress partial blocks of data (zlib can stream)
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const int BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
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const int MetadataOffset = sizeof(m_BlockTypes);
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const int BlockLightOffset = MetadataOffset + sizeof(m_BlockMetas);
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const int SkyLightOffset = BlockLightOffset + sizeof(m_BlockLight);
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const int BiomeOffset = SkyLightOffset + sizeof(m_BlockSkyLight);
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const int DataSize = BiomeOffset + BiomeDataSize;
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// Temporary buffer for the composed data:
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char AllData [DataSize];
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memcpy(AllData, m_BlockTypes, sizeof(m_BlockTypes));
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memcpy(AllData + MetadataOffset, m_BlockMetas, sizeof(m_BlockMetas));
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memcpy(AllData + BlockLightOffset, m_BlockLight, sizeof(m_BlockLight));
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memcpy(AllData + SkyLightOffset, m_BlockSkyLight, sizeof(m_BlockSkyLight));
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memcpy(AllData + BiomeOffset, m_BiomeData, BiomeDataSize);
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// Compress the data:
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// In order not to use allocation, use a fixed-size buffer, with the size
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// that uses the same calculation as compressBound():
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const uLongf CompressedMaxSize = DataSize + (DataSize >> 12) + (DataSize >> 14) + (DataSize >> 25) + 16;
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char CompressedBlockData[CompressedMaxSize];
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uLongf CompressedSize = compressBound(DataSize);
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// Run-time check that our compile-time guess about CompressedMaxSize was enough:
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ASSERT(CompressedSize <= CompressedMaxSize);
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compress2((Bytef*)CompressedBlockData, &CompressedSize, (const Bytef*)AllData, sizeof(AllData), Z_DEFAULT_COMPRESSION);
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// Now put all those data into a_Data:
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// "Ground-up continuous", or rather, "biome data present" flag:
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a_Data.push_back('\x01');
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// Two bitmaps; we're aways sending the full chunk with no additional data, so the bitmaps are 0xffff and 0, respectively
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// Also, no endian flipping is needed because of the const values
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unsigned short BitMap1 = 0xffff;
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unsigned short BitMap2 = 0;
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a_Data.append((const char *)&BitMap1, sizeof(short));
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a_Data.append((const char *)&BitMap2, sizeof(short));
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UInt32 CompressedSizeBE = htonl((UInt32)CompressedSize);
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a_Data.append((const char *)&CompressedSizeBE, sizeof(CompressedSizeBE));
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Int32 UnusedInt32 = 0;
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a_Data.append((const char *)&UnusedInt32, sizeof(UnusedInt32));
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a_Data.append(CompressedBlockData, CompressedSize);
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}
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void cChunkDataSerializer::Serialize39(AString & a_Data)
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{
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// TODO: Do not copy data and then compress it; rather, compress partial blocks of data (zlib can stream)
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const int BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
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const int MetadataOffset = sizeof(m_BlockTypes);
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const int BlockLightOffset = MetadataOffset + sizeof(m_BlockMetas);
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const int SkyLightOffset = BlockLightOffset + sizeof(m_BlockLight);
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const int BiomeOffset = SkyLightOffset + sizeof(m_BlockSkyLight);
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const int DataSize = BiomeOffset + BiomeDataSize;
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// Temporary buffer for the composed data:
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char AllData [DataSize];
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memcpy(AllData, m_BlockTypes, sizeof(m_BlockTypes));
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memcpy(AllData + MetadataOffset, m_BlockMetas, sizeof(m_BlockMetas));
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memcpy(AllData + BlockLightOffset, m_BlockLight, sizeof(m_BlockLight));
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memcpy(AllData + SkyLightOffset, m_BlockSkyLight, sizeof(m_BlockSkyLight));
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memcpy(AllData + BiomeOffset, m_BiomeData, BiomeDataSize);
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// Compress the data:
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// In order not to use allocation, use a fixed-size buffer, with the size
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// that uses the same calculation as compressBound():
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const uLongf CompressedMaxSize = DataSize + (DataSize >> 12) + (DataSize >> 14) + (DataSize >> 25) + 16;
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char CompressedBlockData[CompressedMaxSize];
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uLongf CompressedSize = compressBound(DataSize);
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// Run-time check that our compile-time guess about CompressedMaxSize was enough:
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ASSERT(CompressedSize <= CompressedMaxSize);
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compress2((Bytef*)CompressedBlockData, &CompressedSize, (const Bytef*)AllData, sizeof(AllData), Z_DEFAULT_COMPRESSION);
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// Now put all those data into a_Data:
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// "Ground-up continuous", or rather, "biome data present" flag:
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a_Data.push_back('\x01');
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// Two bitmaps; we're aways sending the full chunk with no additional data, so the bitmaps are 0xffff and 0, respectively
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// Also, no endian flipping is needed because of the const values
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unsigned short BitMap1 = 0xffff;
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unsigned short BitMap2 = 0;
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a_Data.append((const char *)&BitMap1, sizeof(short));
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a_Data.append((const char *)&BitMap2, sizeof(short));
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UInt32 CompressedSizeBE = htonl((UInt32)CompressedSize);
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a_Data.append((const char *)&CompressedSizeBE, sizeof(CompressedSizeBE));
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// Unlike 29, 39 doesn't have the "unused" int
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a_Data.append(CompressedBlockData, CompressedSize);
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}
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void cChunkDataSerializer::Serialize47(AString & a_Data, int a_ChunkX, int a_ChunkZ)
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{
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// This function returns the fully compressed packet (including packet size), not the raw packet!
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// Create the packet:
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cByteBuffer Packet(512 KiB);
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Packet.WriteVarInt32(0x21); // Packet id (Chunk Data packet)
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Packet.WriteBEInt32(a_ChunkX);
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Packet.WriteBEInt32(a_ChunkZ);
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Packet.WriteBool(true); // "Ground-up continuous", or rather, "biome data present" flag
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Packet.WriteBEUInt16(0xffff); // We're aways sending the full chunk with no additional data, so the bitmap is 0xffff
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// Write the chunk size:
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const int BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
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UInt32 ChunkSize = (
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(cChunkDef::NumBlocks * 2) + // Block meta + type
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sizeof(m_BlockLight) + // Block light
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sizeof(m_BlockSkyLight) + // Block sky light
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BiomeDataSize // Biome data
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);
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Packet.WriteVarInt32(ChunkSize);
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// Write the block types to the packet:
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for (size_t Index = 0; Index < cChunkDef::NumBlocks; Index++)
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{
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BLOCKTYPE BlockType = m_BlockTypes[Index] & 0xFF;
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NIBBLETYPE BlockMeta = m_BlockMetas[Index / 2] >> ((Index & 1) * 4) & 0x0f;
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Packet.WriteBEUInt8(static_cast<unsigned char>(BlockType << 4) | BlockMeta);
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Packet.WriteBEUInt8(static_cast<unsigned char>(BlockType >> 4));
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}
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// Write the rest:
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Packet.WriteBuf(m_BlockLight, sizeof(m_BlockLight));
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Packet.WriteBuf(m_BlockSkyLight, sizeof(m_BlockSkyLight));
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Packet.WriteBuf(m_BiomeData, BiomeDataSize);
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AString PacketData;
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Packet.ReadAll(PacketData);
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Packet.CommitRead();
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cByteBuffer Buffer(20);
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if (PacketData.size() >= 256)
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{
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if (!cProtocol180::CompressPacket(PacketData, a_Data))
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{
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ASSERT(!"Packet compression failed.");
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a_Data.clear();
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return;
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}
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}
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else
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{
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AString PostData;
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Buffer.WriteVarInt32(static_cast<UInt32>(Packet.GetUsedSpace() + 1));
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Buffer.WriteVarInt32(0);
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Buffer.ReadAll(PostData);
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Buffer.CommitRead();
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a_Data.clear();
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a_Data.reserve(PostData.size() + PacketData.size());
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a_Data.append(PostData.data(), PostData.size());
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a_Data.append(PacketData.data(), PacketData.size());
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}
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}
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