// Processor.cpp
// Implements the cProcessor class representing the overall processor engine that manages threads, calls callbacks etc.
#include "Globals.h"
#include "Processor.h"
#include "Callback.h"
#include "../source/WorldStorage/FastNBT.h"
#include "zlib.h"
const int CHUNK_INFLATE_MAX = 1 MiB;
const int MAX_COMPRESSED_CHUNK_SIZE = 1 MiB;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cProcessor::cThread:
cProcessor::cThread::cThread(cCallback & a_Callback, cProcessor & a_ParentProcessor) :
super("cProcessor::cThread"),
m_Callback(a_Callback),
m_ParentProcessor(a_ParentProcessor)
{
super::Start();
}
void cProcessor::cThread::Execute(void)
{
for (;;)
{
AString FileName = m_ParentProcessor.GetOneFileName();
if (FileName.empty())
{
// All done, terminate the thread
return;
}
ProcessFile(FileName);
} // for-ever
}
void cProcessor::cThread::ProcessFile(const AString & a_FileName)
{
LOG("Processing file \"%s\"", a_FileName.c_str());
size_t idx = a_FileName.rfind("r.");
if (idx == AString::npos)
{
LOG("Cannot parse filename \"%s\", skipping file.", a_FileName.c_str());
return;
}
int RegionX = 0, RegionZ = 0;
if (sscanf_s(a_FileName.c_str() + idx, "r.%d.%d.mca", &RegionX, &RegionZ) != 2)
{
LOG("Cannot parse filename \"%s\" into coords, skipping file.", a_FileName.c_str());
return;
}
cFile f;
if (!f.Open(a_FileName, cFile::fmRead))
{
LOG("Cannot open file \"%s\", skipping file.", a_FileName.c_str());
return;
}
int Header[2048];
if (f.Read(Header, sizeof(Header)) != sizeof(Header))
{
LOG("Cannot read header in file \"%s\", skipping file.", a_FileName.c_str());
return;
}
for (int i = 0; i < ARRAYCOUNT(Header); i++)
{
Header[i] = ntohl(Header[i]);
}
int ChunkBaseX = RegionX * 32;
int ChunkBaseZ = RegionZ * 32;
for (int i = 0; i < 1024; i++)
{
unsigned Location = Header[i];
unsigned Timestamp = Header[i + 1024];
if (
((Location == 0) && (Timestamp == 0)) || // Official docs' "not present"
(Location >> 8 < 2) || // Logical - no chunk can start inside the header
((Location & 0xff) == 0) // Logical - no chunk can be zero bytes
)
{
// Chunk not present in the file
continue;
}
int ChunkX = ChunkBaseX + (i % 32);
int ChunkZ = ChunkBaseZ + (i / 32);
if (m_Callback.OnNewChunk(ChunkX, ChunkZ))
{
continue;
}
ProcessChunk(f, ChunkX, ChunkZ, Location >> 8, Location & 0xff, Timestamp);
} // for i - chunk index
}
void cProcessor::cThread::ProcessChunk(cFile & a_File, int a_ChunkX, int a_ChunkZ, unsigned a_SectorStart, unsigned a_SectorSize, unsigned a_TimeStamp)
{
if (m_Callback.OnHeader(a_SectorStart * 4096, a_SectorSize, a_TimeStamp))
{
return;
}
if (a_File.Seek(a_SectorStart * 4096) < 0)
{
LOG("Seeking to sector %d failed, skipping chunk [%d, %d]", a_SectorStart, a_ChunkX, a_ChunkZ);
return;
}
int ByteSize;
if (a_File.Read(&ByteSize, sizeof(ByteSize)) != sizeof(ByteSize))
{
LOG("Cannot read bytesize at offset %d, skipping chunk [%d, %d].", a_SectorStart * 4096, a_ChunkX, a_ChunkZ);
return;
}
ByteSize = ntohl(ByteSize);
char CompressionMethod;
if (a_File.Read(&CompressionMethod, sizeof(CompressionMethod)) != sizeof(CompressionMethod))
{
LOG("Cannot read CompressionMethod at offset %d, skipping chunk [%d, %d].", a_SectorStart * 4096 + 4, a_ChunkX, a_ChunkZ);
return;
}
if (m_Callback.OnCompressedDataSizePos(ByteSize, a_SectorStart * 4096 + 5, CompressionMethod))
{
return;
}
char CompressedData[MAX_COMPRESSED_CHUNK_SIZE];
if (a_File.Read(CompressedData, ByteSize - 1) != ByteSize - 1)
{
LOG("Cannot read %d bytes of compressed data at offset %d, skipping chunk [%d, %d]", ByteSize - 1, a_SectorStart * 4096 + 5, a_ChunkX, a_ChunkZ);
return;
}
ProcessCompressedChunkData(a_ChunkX, a_ChunkZ, CompressedData, ByteSize);
}
void cProcessor::cThread::ProcessCompressedChunkData(int a_ChunkX, int a_ChunkZ, const char * a_CompressedData, int a_CompressedSize)
{
char Decompressed[CHUNK_INFLATE_MAX];
z_stream strm;
strm.zalloc = (alloc_func)NULL;
strm.zfree = (free_func)NULL;
strm.opaque = NULL;
inflateInit(&strm);
strm.next_out = (Bytef *)Decompressed;
strm.avail_out = sizeof(Decompressed);
strm.next_in = (Bytef *)a_CompressedData;
strm.avail_in = a_CompressedSize;
int res = inflate(&strm, Z_FINISH);
inflateEnd(&strm);
if (res != Z_STREAM_END)
{
LOG("Decompression failed, skipping chunk [%d, %d]", a_ChunkX, a_ChunkZ);
return;
}
if (m_Callback.OnDecompressedData(Decompressed, strm.total_out))
{
return;
}
// Parse the NBT data:
cParsedNBT NBT(Decompressed, strm.total_out);
if (!NBT.IsValid())
{
LOG("NBT Parsing failed, skipping chunk [%d, %d]", a_ChunkX, a_ChunkZ);
return;
}
ProcessParsedChunkData(a_ChunkX, a_ChunkZ, NBT);
}
void cProcessor::cThread::ProcessParsedChunkData(int a_ChunkX, int a_ChunkZ, cParsedNBT & a_NBT)
{
int LevelTag = a_NBT.FindChildByName(0, "Level");
if (LevelTag < 0)
{
LOG("Bad logical structure of the NBT, skipping chunk [%d, %d].", a_ChunkX, a_ChunkZ);
return;
}
int XPosTag = a_NBT.FindChildByName(LevelTag, "xPos");
int ZPosTag = a_NBT.FindChildByName(LevelTag, "zPos");
if ((XPosTag < 0) || (ZPosTag < 0))
{
LOG("Pos tags missing in NTB, skipping chunk [%d, %d].", a_ChunkX, a_ChunkZ);
return;
}
if (m_Callback.OnRealCoords(a_NBT.GetInt(XPosTag), a_NBT.GetInt(ZPosTag)))
{
return;
}
int LastUpdateTag = a_NBT.FindChildByName(LevelTag, "LastUpdate");
if (LastUpdateTag > 0)
{
if (m_Callback.OnLastUpdate(a_NBT.GetLong(LastUpdateTag)))
{
return;
}
}
int TerrainPopulatedTag = a_NBT.FindChildByName(LevelTag, "TerrainPopulated");
bool TerrainPopulated = (TerrainPopulatedTag < 0) ? false : (a_NBT.GetByte(TerrainPopulatedTag) != 0);
if (m_Callback.OnTerrainPopulated(TerrainPopulated))
{
return;
}
int BiomesTag = a_NBT.FindChildByName(LevelTag, "Biomes");
if (BiomesTag > 0)
{
if (m_Callback.OnBiomes((const unsigned char *)(a_NBT.GetData(BiomesTag))))
{
return;
}
}
int HeightMapTag = a_NBT.FindChildByName(LevelTag, "HeightMap");
if (HeightMapTag > 0)
{
if (m_Callback.OnHeightMap((const int *)(a_NBT.GetData(HeightMapTag))))
{
return;
}
}
if (ProcessChunkSections(a_ChunkX, a_ChunkZ, a_NBT, LevelTag))
{
return;
}
// TODO: entities, tile-entities etc.
}
bool cProcessor::cThread::ProcessChunkSections(int a_ChunkX, int a_ChunkZ, cParsedNBT & a_NBT, int a_LevelTag)
{
int Sections = a_NBT.FindChildByName(a_LevelTag, "Sections");
if (Sections < 0)
{
return false;
}
for (int Tag = a_NBT.GetFirstChild(Sections); Tag > 0; Tag = a_NBT.GetNextSibling(Tag))
{
int YTag = a_NBT.FindChildByName(Tag, "Y");
int BlocksTag = a_NBT.FindChildByName(Tag, "Blocks");
int AddTag = a_NBT.FindChildByName(Tag, "Add");
int DataTag = a_NBT.FindChildByName(Tag, "Data");
int BlockLightTag = a_NBT.FindChildByName(Tag, "BlockLightTag");
int SkyLightTag = a_NBT.FindChildByName(Tag, "SkyLight");
if ((YTag < 0) || (BlocksTag < 0) || (DataTag < 0))
{
continue;
}
if (m_Callback.OnSection(
a_NBT.GetByte(YTag),
(const BLOCKTYPE *) (a_NBT.GetData(BlocksTag)),
(AddTag > 0) ? (const NIBBLETYPE *)(a_NBT.GetData(AddTag)) : NULL,
(const NIBBLETYPE *)(a_NBT.GetData(DataTag)),
(BlockLightTag > 0) ? (const NIBBLETYPE *)(a_NBT.GetData(BlockLightTag)) : NULL,
(BlockLightTag > 0) ? (const NIBBLETYPE *)(a_NBT.GetData(BlockLightTag)) : NULL
))
{
return true;
}
} // for Tag - Sections[]
return false;
}
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// cProcessor:
cProcessor::cProcessor(void) :
m_IsShuttingDown(false)
{
}
cProcessor::~cProcessor()
{
}
void cProcessor::ProcessWorld(const AString & a_WorldFolder, cCallbackFactory & a_CallbackFactory)
{
PopulateFileQueue(a_WorldFolder);
// Start as many threads as there are cores:
// Get number of cores by querying the system process affinity mask
DWORD Affinity, ProcAffinity;
GetProcessAffinityMask(GetCurrentProcess(), &ProcAffinity, &Affinity);
while (Affinity > 0)
{
if ((Affinity & 1) == 1)
{
cCallback * Callback = a_CallbackFactory.GetNewCallback();
m_Threads.push_back(new cThread(*Callback, *this));
}
Affinity >>= 1;
} // while (Affinity > 0)
if (m_Threads.size() == 0)
{
LOG("Zero cores detected - how am I running? Running in a single thread.");
cCallback * Callback = a_CallbackFactory.GetNewCallback();
m_Threads.push_back(new cThread(*Callback, *this));
}
// Wait for all threads to finish
// simply by calling each thread's destructor sequentially
for (cThreads::iterator itr = m_Threads.begin(), end = m_Threads.end(); itr != end; ++itr)
{
delete *itr;
} // for itr - m_Threads[]
}
void cProcessor::PopulateFileQueue(const AString & a_WorldFolder)
{
LOG("Processing world in \"%s\"...", a_WorldFolder.c_str());
AString Path = a_WorldFolder;
Path.push_back(cFile::PathSeparator);
AStringList AllFiles = GetDirectoryContents(Path.c_str());
for (AStringList::iterator itr = AllFiles.begin(), end = AllFiles.end(); itr != end; ++itr)
{
if (itr->rfind(".mca") != itr->length() - 4)
{
// Not a .mca file
continue;
}
m_FileQueue.push_back(Path + *itr);
} // for itr - AllFiles[]
}
AString cProcessor::GetOneFileName(void)
{
cCSLock Lock(m_CS);
if (m_FileQueue.empty())
{
return "";
}
AString res = m_FileQueue.back();
m_FileQueue.pop_back();
return res;
}
