//////////////////////////////////////////////////////////////////////////
// low level function, reads directly from the file
// TODO: remove all those pOSSaveReader parameter chains and make it a member, passing it along is not needed anymore
void CReader::ReadDataFromFileInternal( IPlatformOS::ISaveReaderPtr& pOSSaveReader, void* pDst, uint32 numBytes )
{
assert( pOSSaveReader.get() );
if (!m_errorReading)
{
IPlatformOS::EFileOperationCode code = pOSSaveReader->ReadBytes( pDst, numBytes );
CheckErrorFlag( code );
}
}
bool CReader::CheckFileCorruption( IPlatformOS::ISaveReaderPtr& pOSSaveReader, const SFileHeader& fileHeader, uint32 totalSize )
{
bool error = false;
if (totalSize<=sizeof(fileHeader))
{
CryWarning( VALIDATOR_MODULE_SYSTEM, VALIDATOR_ERROR, "XMLCPB ERROR: size check failed. savegame File corrupted! (probably not fully saved)" );
error = true;
return error;
}
uint32 sizeToCheck = totalSize - sizeof(fileHeader);
char* pBuf = new char[sizeToCheck];
pOSSaveReader->Seek( 0, IPlatformOS::ISaveReader::ESM_BEGIN );
ReadDataFromFileInternal( pOSSaveReader, pBuf, sizeToCheck );
IZLibCompressor* pZLib = GetISystem()->GetIZLibCompressor();
if (!pZLib)
{
SAFE_DELETE_ARRAY(pBuf);
error = true;
return error;
}
SMD5Context context;
char MD5signature[SFileHeader::MD5_SIGNATURE_SIZE];
pZLib->MD5Init(&context);
pZLib->MD5Update(&context, pBuf, sizeToCheck);
SFileHeader tempFileHeader = fileHeader;
for (uint32 i=0; i<SFileHeader::MD5_SIGNATURE_SIZE; ++i) tempFileHeader.m_MD5Signature[i] = 0; // the original signature is always calculated with this zeroed.
pZLib->MD5Update(&context, (const char*)(&tempFileHeader), sizeof(tempFileHeader));
pZLib->MD5Final(&context, MD5signature);
SAFE_DELETE_ARRAY( pBuf );
for (uint32 i=0; i<SFileHeader::MD5_SIGNATURE_SIZE; ++i)
{
if (fileHeader.m_MD5Signature[i]!=MD5signature[i])
{
CryWarning( VALIDATOR_MODULE_SYSTEM, VALIDATOR_ERROR, "XMLCPB ERROR: md5 check failed. savegame File corrupted!" );
error = true;
break;
}
}
return error;
}
bool CReader::ReadBinaryFile( const char* pFileName )
{
IPlatformOS::ISaveReaderPtr pOSSaveReader = gEnv->pSystem->GetPlatformOS()->SaveGetReader( pFileName, IPlatformOS::Unknown_User );
if (!m_pZLibBuffer)
m_pZLibBuffer = new uint8[ XMLCPB_ZLIB_BUFFER_SIZE ];
if (!m_pZLibCompressedBuffer)
m_pZLibCompressedBuffer = new uint8[ XMLCPB_ZLIB_BUFFER_SIZE ];
m_errorReading = pOSSaveReader.get()==NULL;
if (!m_errorReading)
{
size_t totalNumBytesInFile = 0;
IPlatformOS::EFileOperationCode code = pOSSaveReader->GetNumBytes( totalNumBytesInFile );
m_totalSize = totalNumBytesInFile;
CheckErrorFlag( code );
if (!m_errorReading)
{
SFileHeader fileHeader;
pOSSaveReader->Seek( -int(sizeof(fileHeader)), IPlatformOS::ISaveReader::ESM_END );
ReadDataFromFileInternal( pOSSaveReader, &fileHeader, sizeof(fileHeader) );
#ifdef XMLCPB_CHECK_FILE_INTEGRITY
m_errorReading = CheckFileCorruption( pOSSaveReader, fileHeader, m_totalSize );
#endif
pOSSaveReader->Seek( 0, IPlatformOS::ISaveReader::ESM_BEGIN );
if (fileHeader.m_fileTypeCheck!=fileHeader.FILETYPECHECK)
{
CryWarning( VALIDATOR_MODULE_SYSTEM, VALIDATOR_ERROR, "XMLCPB ERROR: file type signature not correct. Savegame File corrupted!" );
m_errorReading = true;
}
if (!m_errorReading)
{
m_nodesDataSize = fileHeader.m_sizeNodes;
m_numNodes = fileHeader.m_numNodes;
m_buffer.ReadFromFile( *this, pOSSaveReader, fileHeader.m_sizeNodes );
m_tableTags.ReadFromFile( *this, pOSSaveReader, fileHeader.m_tags );
m_tableAttrNames.ReadFromFile( *this, pOSSaveReader, fileHeader.m_attrNames );
m_tableStrData.ReadFromFile( *this, pOSSaveReader, fileHeader.m_strData );
m_tableAttrSets.ReadFromFile( *this, pOSSaveReader, fileHeader );
CreateNodeAddressTables();
}
if (!m_errorReading)
{
const CNodeLiveReader& root = ActivateLiveNodeFromCompact( m_numNodes - 1 ); // the last node is always the root
assert( root.GetLiveId()==XMLCPB_ROOTNODE_ID );
pOSSaveReader->TouchFile();
}
}
pOSSaveReader->Close();
}
CryLog("[LOAD GAME] --Binary saveload: reading done--");
if (m_errorReading)
CryWarning( VALIDATOR_MODULE_SYSTEM, VALIDATOR_ERROR, "XMLCPB ERROR: while reading the file: '%s'", pFileName );
return !m_errorReading;
}
bool CXmlLoadGame::Init( const char * name )
{
#ifdef XML_LOADGAME_USE_COMPRESSION
#if defined(XENON) || defined(PS3)
CryWarning(VALIDATOR_MODULE_GAME,VALIDATOR_ERROR, "CXmlLoadGame::Init not supported yet, strings cannot grow beyond 32767 chars\n");
return false;
#endif
const unsigned int nFileSizeBits = GetISystem()->GetCompressedFileSize(name);
const unsigned int nFileSizeBytes = nFileSizeBits / 8 + ((nFileSizeBits & 7) + 7) / 8;
if (nFileSizeBytes <= 0)
{
return false;
}
char* const pXmlData = new char[nFileSizeBytes+16];
GetISystem()->ReadCompressedFile(name, pXmlData,nFileSizeBits);
m_pImpl->root = GetISystem()->LoadXmlFromBuffer(pXmlData, nFileSizeBytes);
delete []pXmlData;
#else
if (GetISystem()->GetPlatformOS()->UsePlatformSavingAPI() )
{
IPlatformOS::ISaveReaderPtr pSaveReader = GetISystem()->GetPlatformOS()->SaveGetReader(name);
if (!pSaveReader)
{
return false;
}
size_t nFileSize;
if ((pSaveReader->GetNumBytes(nFileSize) == IPlatformOS::eFOC_Failure) || (nFileSize <= 0))
{
return false;
}
std::vector<char> xmlData;
xmlData.resize(nFileSize);
if (pSaveReader->ReadBytes(&xmlData[0], nFileSize) == IPlatformOS::eFOC_Failure)
{
return false;
}
m_pImpl->root = GetISystem()->LoadXmlFromBuffer(&xmlData[0], nFileSize);
}
else
{
m_pImpl->root = GetISystem()->LoadXmlFromFile(name);
}
#endif
if (!m_pImpl->root)
return false;
m_pImpl->inputFile = name;
m_pImpl->metadata = m_pImpl->root->findChild("Metadata");
if (!m_pImpl->metadata)
return false;
return true;
}
