1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
// 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/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;
case RELEASE_1_8_0: Serialize80(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));
UInt32 CompressedSizeBE = htonl((UInt32)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));
UInt32 CompressedSizeBE = htonl((UInt32)CompressedSize);
a_Data.append((const char *)&CompressedSizeBE, sizeof(CompressedSizeBE));
// Unlike 29, 39 doesn't have the "unused" int
a_Data.append(CompressedBlockData, CompressedSize);
}
void cChunkDataSerializer::Serialize80(AString & a_Data)
{
// TODO: Do not copy data and then compress it; rather, compress partial blocks of data (zlib *can* stream)
// Blocktypes converter (1.8 included the meta into the blocktype):
unsigned short Blocks[ARRAYCOUNT(m_BlockTypes)];
for (size_t Index = 0; Index < cChunkDef::NumBlocks; Index++)
{
BLOCKTYPE BlockType = m_BlockTypes[Index];
NIBBLETYPE BlockMeta = m_BlockMetas[Index / 2] >> ((Index & 1) * 4) & 0x0f;
Blocks[Index] = ((unsigned short)BlockType << 4) | ((unsigned short)BlockMeta);
}
const int BiomeDataSize = cChunkDef::Width * cChunkDef::Width;
const int BlockLightOffset = sizeof(Blocks);
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, Blocks, sizeof(Blocks));
memcpy(AllData + BlockLightOffset, m_BlockLight, sizeof(m_BlockLight));
memcpy(AllData + SkyLightOffset, m_BlockSkyLight, sizeof(m_BlockSkyLight));
memcpy(AllData + BiomeOffset, m_BiomeData, BiomeDataSize);
// Put all those data into a_Data:
a_Data.push_back('\x01'); // "Ground-up continuous", or rather, "biome data present" flag
// 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 BitMap = 0xffff;
a_Data.append((const char *)&BitMap, sizeof(unsigned short));
// Write chunk size:
UInt32 ChunkSize = htonl((UInt32)DataSize);
a_Data.append((const char *)&ChunkSize, 4);
a_Data.append(AllData, DataSize); // Chunk data
}
|
