4f17362aeb
git-svn-id: http://mc-server.googlecode.com/svn/trunk@251 0a769ca7-a7f5-676a-18bf-c427514a06d6
416 lines
9.2 KiB
C++
416 lines
9.2 KiB
C++
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// WSSCompact.cpp
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// Interfaces to the cWSSCompact class representing the "compact" storage schema (PAK-files)
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#include "Globals.h"
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#include "WSSCompact.h"
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#include "cWorld.h"
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#include "zlib.h"
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#include <json/json.h>
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#pragma pack(push, 1)
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/// The chunk header, as stored in the file:
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struct cWSSCompact::sChunkHeader
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{
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int m_ChunkX;
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int m_ChunkZ;
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int m_CompressedSize;
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int m_UncompressedSize;
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} ;
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#pragma pack(pop)
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/// The maximum number of PAK files that are cached
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const int MAX_PAK_FILES = 16;
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/// The maximum number of unsaved chunks before the cPAKFile saves them to disk
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const int MAX_DIRTY_CHUNKS = 16;
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// cWSSCompact:
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cWSSCompact::~cWSSCompact()
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{
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for (cPAKFiles::iterator itr = m_PAKFiles.begin(); itr != m_PAKFiles.end(); ++itr)
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{
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delete *itr;
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}
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}
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bool cWSSCompact::LoadChunk(const cChunkPtr & a_Chunk)
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{
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cPAKFile * f = LoadPAKFile(a_Chunk);
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if (f == NULL)
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{
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// For some reason we couldn't locate the file
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return false;
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}
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return f->LoadChunk(a_Chunk);
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}
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bool cWSSCompact::SaveChunk(const cChunkPtr & a_Chunk)
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{
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cPAKFile * f = LoadPAKFile(a_Chunk);
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if (f == NULL)
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{
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// For some reason we couldn't locate the file
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return false;
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}
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return f->SaveChunk(a_Chunk);
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}
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cWSSCompact::cPAKFile * cWSSCompact::LoadPAKFile(const cChunkPtr & a_Chunk)
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{
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// We need to retain this weird conversion code, because some edge chunks are in the wrong PAK file
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const int LayerX = (int)(floorf((float)a_Chunk->GetPosX() / 32.0f));
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const int LayerZ = (int)(floorf((float)a_Chunk->GetPosZ() / 32.0f));
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// Is it already cached?
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for (cPAKFiles::iterator itr = m_PAKFiles.begin(); itr != m_PAKFiles.end(); ++itr)
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{
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if (((*itr) != NULL) && ((*itr)->GetLayerX() == LayerX) && ((*itr)->GetLayerZ() == LayerZ))
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{
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// Move the file to front and return it:
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cPAKFile * f = *itr;
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if (itr != m_PAKFiles.begin())
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{
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m_PAKFiles.erase(itr);
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m_PAKFiles.push_front(f);
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}
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return f;
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}
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}
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// Load it anew:
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AString FileName;
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Printf(FileName, "%s/X%i_Z%i.pak", m_World->GetName().c_str(), LayerX, LayerZ );
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cPAKFile * f = new cPAKFile(FileName, LayerX, LayerZ);
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if (f == NULL)
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{
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return NULL;
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}
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m_PAKFiles.push_front(f);
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// If there are too many PAK files cached, delete the last one used:
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if (m_PAKFiles.size() > MAX_PAK_FILES)
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{
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delete m_PAKFiles.back();
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m_PAKFiles.pop_back();
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}
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return f;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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// cWSSCompact::cPAKFile
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#define READ(Var) \
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if (f.Read(&Var, sizeof(Var)) != sizeof(Var)) \
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{ \
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LOGERROR("ERROR READING %s FROM FILE %s (line %d); file offset %d", #Var, m_FileName.c_str(), __LINE__, f.Tell()); \
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return; \
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}
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cWSSCompact::cPAKFile::cPAKFile(const AString & a_FileName, int a_LayerX, int a_LayerZ) :
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m_FileName(a_FileName),
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m_LayerX(a_LayerX),
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m_LayerZ(a_LayerZ),
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m_NumDirty(0)
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{
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cFile f;
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if (!f.Open(m_FileName, cFile::fmRead))
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{
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return;
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}
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// Read headers:
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char PakVersion = 0;
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READ(PakVersion);
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if (PakVersion != 1)
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{
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LOGERROR("File \"%s\" is in an unknown pak format (%d)", m_FileName.c_str(), PakVersion);
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return;
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}
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char ChunkVersion = 0;
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READ(ChunkVersion);
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if (ChunkVersion != 1)
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{
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LOGERROR("File \"%s\" is in an unknown chunk format (%d)", m_FileName.c_str(), ChunkVersion);
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return;
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}
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short NumChunks = 0;
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READ(NumChunks);
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// Read chunk headers:
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for (int i = 0; i < NumChunks; i++)
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{
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sChunkHeader * Header = new sChunkHeader;
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READ(*Header);
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m_ChunkHeaders.push_back(Header);
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} // for i - chunk headers
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// Read chunk data:
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if (f.ReadRestOfFile(m_DataContents) == -1)
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{
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LOGERROR("Cannot read file \"%s\" contents", m_FileName.c_str());
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return;
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}
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}
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cWSSCompact::cPAKFile::~cPAKFile()
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{
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if (m_NumDirty > 0)
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{
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SynchronizeFile();
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}
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for (sChunkHeaders::iterator itr = m_ChunkHeaders.begin(); itr != m_ChunkHeaders.end(); ++itr)
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{
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delete *itr;
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}
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}
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bool cWSSCompact::cPAKFile::LoadChunk(const cChunkPtr & a_Chunk)
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{
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int ChunkX = a_Chunk->GetPosX();
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int ChunkZ = a_Chunk->GetPosZ();
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sChunkHeader * Header = NULL;
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int Offset = 0;
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for (sChunkHeaders::iterator itr = m_ChunkHeaders.begin(); itr != m_ChunkHeaders.end(); ++itr)
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{
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if (((*itr)->m_ChunkX == ChunkX) && ((*itr)->m_ChunkZ == ChunkZ))
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{
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Header = *itr;
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break;
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}
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Offset += (*itr)->m_CompressedSize;
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}
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if ((Header == NULL) || (Offset + Header->m_CompressedSize > (int)m_DataContents.size()))
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{
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// Chunk not found / data invalid
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return false;
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}
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return LoadChunk(a_Chunk, Offset, Header);
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}
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bool cWSSCompact::cPAKFile::SaveChunk(const cChunkPtr & a_Chunk)
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{
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if (!SaveChunkToData(a_Chunk))
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{
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return false;
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}
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if (m_NumDirty > MAX_DIRTY_CHUNKS)
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{
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SynchronizeFile();
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}
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return true;
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}
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bool cWSSCompact::cPAKFile::LoadChunk(const cChunkPtr & a_Chunk, int a_Offset, sChunkHeader * a_Header)
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{
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// Decompress the data:
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uLongf DestSize = a_Header->m_UncompressedSize;
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std::auto_ptr<char> BlockData(new char[ DestSize ]);
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int errorcode = uncompress( (Bytef*)BlockData.get(), &DestSize, (Bytef*)m_DataContents.data() + a_Offset, a_Header->m_CompressedSize );
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if (errorcode != Z_OK)
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{
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LOGERROR("Error %d decompressing data for chunk [%d, %d] from file \"%s\"",
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errorcode,
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a_Chunk->GetPosX(), a_Chunk->GetPosZ(),
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m_FileName.c_str()
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);
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return false;
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}
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if (a_Header->m_UncompressedSize != DestSize)
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{
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LOGWARNING("Uncompressed data size differs (exp %d, got %d) for chunk [%d, %d] from file \"%s\"",
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a_Header->m_UncompressedSize, DestSize,
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a_Chunk->GetPosX(), a_Chunk->GetPosZ(),
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m_FileName.c_str()
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);
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return false;
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}
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a_Chunk->CopyBlockDataFrom(BlockData.get());
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a_Chunk->SetValid();
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if (DestSize > cChunk::c_BlockDataSize ) // We gots some extra data :D
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{
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LOGINFO("Parsing trailing JSON");
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Json::Value root; // will contain the root value after parsing.
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Json::Reader reader;
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if ( !reader.parse( BlockData.get() + cChunk::c_BlockDataSize, root, false ) )
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{
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LOGERROR("Failed to parse trailing JSON!");
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}
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else
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{
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a_Chunk->LoadFromJson( root );
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}
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}
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return true;
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}
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void cWSSCompact::cPAKFile::EraseChunk(const cChunkPtr & a_Chunk)
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{
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int ChunkX = a_Chunk->GetPosX();
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int ChunkZ = a_Chunk->GetPosZ();
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sChunkHeader * Header = NULL;
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int Offset = 0;
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for (sChunkHeaders::iterator itr = m_ChunkHeaders.begin(); itr != m_ChunkHeaders.end(); ++itr)
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{
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if (((*itr)->m_ChunkX == ChunkX) && ((*itr)->m_ChunkZ == ChunkZ))
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{
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m_DataContents.erase(Offset, (*itr)->m_CompressedSize);
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delete *itr;
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itr = m_ChunkHeaders.erase(itr);
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return;
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}
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Offset += (*itr)->m_CompressedSize;
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}
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}
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bool cWSSCompact::cPAKFile::SaveChunkToData(const cChunkPtr & a_Chunk)
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{
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// Erase any existing data for the chunk:
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EraseChunk(a_Chunk);
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// Serialize the chunk:
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AString Data;
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Data.assign(a_Chunk->pGetBlockData(), cChunk::c_BlockDataSize);
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Json::Value root;
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a_Chunk->SaveToJson( root );
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if (!root.empty())
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{
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AString JsonData;
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Json::StyledWriter writer;
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JsonData = writer.write( root );
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Data.append(JsonData);
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}
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// Compress the data:
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uLongf CompressedSize = compressBound(Data.size());
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std::auto_ptr<char> Compressed(new char[CompressedSize]);
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int errorcode = compress2( (Bytef*)Compressed.get(), &CompressedSize, (const Bytef*)Data.data(), Data.size(), Z_DEFAULT_COMPRESSION);
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if ( errorcode != Z_OK )
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{
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LOGERROR("Error %i compressing data for chunk [%d, %d]", errorcode, a_Chunk->GetPosX(), a_Chunk->GetPosZ() );
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return false;
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}
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// Save the header:
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sChunkHeader * Header = new sChunkHeader;
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if (Header == NULL)
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{
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return false;
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}
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Header->m_CompressedSize = CompressedSize;
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Header->m_ChunkX = a_Chunk->GetPosX();
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Header->m_ChunkZ = a_Chunk->GetPosZ();
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Header->m_UncompressedSize = Data.size();
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m_ChunkHeaders.push_back(Header);
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m_DataContents.append(Compressed.get(), CompressedSize);
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m_NumDirty++;
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return true;
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}
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#define WRITE(Var) \
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if (f.Write(&Var, sizeof(Var)) != sizeof(Var)) \
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{ \
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LOGERROR("cWSSCompact: ERROR writing %s to file \"%s\" (line %d); file offset %d", #Var, m_FileName.c_str(), __LINE__, f.Tell()); \
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return; \
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}
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void cWSSCompact::cPAKFile::SynchronizeFile(void)
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{
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cFile f;
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if (!f.Open(m_FileName, cFile::fmWrite))
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{
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LOGERROR("Cannot open PAK file \"%s\" for writing", m_FileName.c_str());
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return;
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}
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char PakVersion = 1;
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WRITE(PakVersion);
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char ChunkVersion = 1;
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WRITE(ChunkVersion);
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short NumChunks = (short)m_ChunkHeaders.size();
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WRITE(NumChunks);
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for (sChunkHeaders::iterator itr = m_ChunkHeaders.begin(); itr != m_ChunkHeaders.end(); ++itr)
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{
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WRITE(**itr);
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}
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if (f.Write(m_DataContents.data(), m_DataContents.size()) != m_DataContents.size())
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{
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LOGERROR("cWSSCompact: ERROR writing chunk contents to file \"%s\" (line %d); file offset %d", m_FileName.c_str(), __LINE__, f.Tell());
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return;
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}
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m_NumDirty = 0;
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}
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