unsigned char *CYmMusic::depackFile(void)
{
lzhHeader_t *pHeader;
ymu8 *pNew;
ymu8 *pSrc;
pHeader = (lzhHeader_t*)pBigMalloc;
if ((pHeader->size==0) || // NOTE: Endianness works because value is 0
(strncmp(pHeader->id,"-lh5-",5)))
{ // Le fichier n'est pas compresse, on retourne l'original.
return pBigMalloc;
}
fileSize = (ymu32)-1;
if (pHeader->level != 0) // NOTE: Endianness works because value is 0
{ // Compression LH5, header !=0 : Error.
free(pBigMalloc);
pBigMalloc = NULL;
setLastError("LHARC Header must be 0 !");
return NULL;
}
fileSize = ReadLittleEndian32((ymu8*)&pHeader->original);
pNew = (ymu8*)malloc(fileSize);
if (!pNew)
{
setLastError("MALLOC Failed !");
free(pBigMalloc);
pBigMalloc = NULL;
return NULL;
}
pSrc = pBigMalloc+sizeof(lzhHeader_t)+pHeader->name_lenght; // NOTE: Endianness works because name_lenght is a byte
pSrc += 2; // skip CRC16
const int packedSize = ReadLittleEndian32((ymu8*)&pHeader->packed);
// alloc space for depacker and depack data
CLzhDepacker *pDepacker = new CLzhDepacker;
const bool bRet = pDepacker->LzUnpack(pSrc,packedSize,pNew,fileSize);
delete pDepacker;
if (!bRet)
{ // depacking error
setLastError("LH5 Depacking Error !");
free(pNew);
free(pBigMalloc);
pNew = NULL;
}
else
free(pBigMalloc); // @ALEX: depacking success, release packed
return pNew;
}
unsigned char *CYmMusic::depackFile(ymu32 checkOriginalSize)
{
lzhHeader_t *pHeader;
ymu8 *pNew;
ymu8 *pSrc;
pHeader = (lzhHeader_t*)pBigMalloc;
if ((pHeader->size==0) || // NOTE: Endianness works because value is 0
(strncmp(pHeader->id,"-lh5-",5)))
{ // Le fichier n'est pas compresse, on retourne l'original.
return pBigMalloc;
}
fileSize = (ymu32)-1;
if (pHeader->level != 0) // NOTE: Endianness works because value is 0
{ // Compression LH5, header !=0 : Error.
free(pBigMalloc);
pBigMalloc = NULL;
setLastError((char*)"LHARC Header must be 0 !");
return NULL;
}
fileSize = ReadLittleEndian32((ymu8*)&pHeader->original);
pNew = (ymu8*)malloc(fileSize);
if (!pNew)
{
setLastError((char*)"MALLOC Failed !");
free(pBigMalloc);
pBigMalloc = NULL;
return NULL;
}
pSrc = pBigMalloc+sizeof(lzhHeader_t)+pHeader->name_lenght; // NOTE: Endianness works because name_lenght is a byte
pSrc += 2; // skip CRC16
ymu32 packedSize = ReadLittleEndian32((ymu8*)&pHeader->packed);
checkOriginalSize -= (ymu32(*pSrc) - ymu32(*pBigMalloc));
if (packedSize > checkOriginalSize)
packedSize = checkOriginalSize;
// Check for corrupted archive
if (packedSize <= checkOriginalSize)
{
// alloc space for depacker and depack data
CLzhDepacker *pDepacker = new CLzhDepacker;
const bool bRet = pDepacker->LzUnpack(pSrc,packedSize,pNew,fileSize);
delete pDepacker;
if (!bRet)
{ // depacking error
setLastError((char*)"LH5 Depacking Error !");
free(pNew);
pNew = NULL;
}
}
else
{
setLastError((char*)"LH5 Depacking Error !");
free(pNew);
pNew = NULL;
}
// Free up source buffer, whatever depacking fail or success
free(pBigMalloc);
return pNew;
}
