// Return the crc checksum of this contents.
virtual unsigned int crc(void)
{
//alread get.
if(m_nCrc!=0xFFFFFFFF) return m_nCrc;
//zero stream?
if(size()==0) return m_nCrc=0;
//keep old file point and move to head
unsigned int nOldPos = tell();
m_nCurrentOffset = 0;
//prepair buf
const unsigned int CRC_BUF_SIZE = 4096;
char szStackBuf[CRC_BUF_SIZE] = {0};
char* pBuf = (size()>=CRC_BUF_SIZE) ? new char[size()] : szStackBuf;
//read to buf
read(pBuf, size());
//caculate crc
crcMemory32(pBuf, size(), m_nCrc);
//free temp memory
if(size()>=CRC_BUF_SIZE) delete[] pBuf;
m_nCurrentOffset = nOldPos;
return m_nCrc;
}
//文件自检功能
bool PackFile::selfCheck(SELFCHECK_CALLBACK callBack)
{
if(0==m_hPakFile)
{
setLastError(AXP_ERR_PARAM);
return false;
}
//编辑模式错误
if(m_fileHead.nEditFlag != 0)
{
setLastError(AXP_ERR_FILE_EDITMODE);
return false;
}
//打开List文件
IStream* pListStream = openFile(LIST_FILENAME);
if(!pListStream) return false;
//skip first line
pListStream->skipLine();
//read second line
char szTempLine[MAX_PATH*4] = {0};
int nLineSize = pListStream->readLine(szTempLine, MAX_PATH*4);
int nFileCount = atoi(szTempLine);
//记录已经检查过的HashNode索引
std::set< unsigned int > setHashNode;
//记录已经检查过的BlockNode索引
std::set< unsigned int > setBlockNode;
//逐行读文件
int nFileListSize = 0;
while (!pListStream->eof())
{
int nLineLength = pListStream->readLine(szTempLine, MAX_PATH*4);
if(0 == nLineLength)
{
pListStream->close();
setLastError(AXP_ERR_FILE_FORMAT, "list file second line=0");
return false;
}
//分析文件描述
std::vector< std::string > vStringVec;
convertStringToVector(szTempLine, vStringVec, "|", true, false);
if(vStringVec.size() != 3)
{
pListStream->close();
setLastError(AXP_ERR_FILE_FORMAT, "list file=%s", szTempLine);
return false;
}
//获得文件信息
std::string& strFileName = vStringVec[0];
unsigned int nFileSize, nFileCRC;
sscanf(vStringVec[1].c_str(), "%08X", &(nFileSize));
sscanf(vStringVec[2].c_str(), "%08X", &(nFileCRC));
//读入文件
IStream* pFileStream = openFile(strFileName.c_str()); //打开文件
if(!pFileStream)
{
pListStream->close();
return false;
}
unsigned int nStreamSize = pFileStream->size();
if(nStreamSize != nFileSize)
{
pFileStream->close();
pListStream->close();
setLastError(AXP_ERR_FILE_FORMAT, "file=%s, sizedif(%d!=%d)",
strFileName.c_str(), nStreamSize, nFileSize);
return false;
}
char* pTempBuf = new char[nStreamSize];
if(nStreamSize != pFileStream->read(pTempBuf, nStreamSize))
{
pFileStream->close();
pListStream->close();
setLastError(AXP_ERR_FILE_READ, "file=%s", strFileName.c_str());
}
pFileStream->close(); pFileStream=0;
//计算文件实际crc
unsigned int nStreamCRC;
crcMemory32(pTempBuf, nStreamSize, nStreamCRC);
delete[] pTempBuf; pTempBuf=0;
if(nStreamCRC != nFileCRC)
{
// pFileStream->close();
pListStream->close();
setLastError(AXP_ERR_FILE_FORMAT, "file=%s, crcdif(%d!=%d)",
strFileName.c_str(), nStreamCRC, nFileCRC);
return false;
}
//保存分析过的文件Hash和Block数据
//得到Hash数据
int nHashPos = getStringPosInHashTable(normaliseName(strFileName).c_str());
setHashNode.insert(nHashPos);
//得到Block数据
unsigned int nBlockIndex = getHashNodeBlockIndex(m_hashTable[nHashPos]);
setBlockNode.insert(nBlockIndex);
nFileListSize++;
};
pListStream->close(); pListStream=0;
//文件个数检查
if(nFileListSize != nFileCount)
{
setLastError(AXP_ERR_FILE_FORMAT, "file countdif(%d!=%d)", nFileListSize, nFileCount);
return false;
}
//得到(list)的Hash数据
int nListFileHashPos = getStringPosInHashTable(LIST_FILENAME);
//得到(list)的Block数据
unsigned int nListFileBlockIndex = getHashNodeBlockIndex(m_hashTable[nListFileHashPos]);
//检查是否有未引用的Hash数据
for(int i=0; i<HASH_TABLE_SIZE; i++)
{
const FILE_HASHNODE& hashNode = m_hashTable[i];
if(!getHashNodeExists(hashNode)) continue;
if(setHashNode.find(i) != setHashNode.end()) continue;
if(i==nListFileHashPos) continue;
//未引用的Hash数据
setLastError(AXP_ERR_FILE_FORMAT, "unref hashnode(%d)", i);
return false;
}
//检查是否有未引用的BlockNode数据
for(int i=0; i<(int)m_blockTable.size(); i++)
{
const FILE_BLOCKNODE& blockNode = m_blockTable[i];
if(!getBlockNodeUsed(blockNode)) continue;
if(setBlockNode.find(i) != setBlockNode.end()) continue;
if(i==nListFileBlockIndex) continue;
//未引用的Hash数据
setLastError(AXP_ERR_FILE_FORMAT, "unref blocknode(%d)", i);
return false;
}
return true;
}
