mcserver/source/WSSCompact.cpp

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