#define Poly 0xEDB88320L//CRC32标准

static unsigned int crc_tab32[];//CRC查询表

//生成CRC查询表

void init_crc32_tab( void )

{

    int i, j;

    unsigned int crc;

    for (i=; i<; i++)

    {

        crc = (unsigned long)i;

        for (j=; j<; j++)

        {

            if ( crc & 0x00000001L )

                crc = ( crc >>  ) ^ Poly;

            else

                crc = crc >> ;

        }

        crc_tab32[i] = crc;

    }

}

//获得CRC

unsigned int get_crc32(unsigned int crcinit, unsigned char * bs, unsigned int bssize)

{

    unsigned int crc = crcinit^0xffffffff;

    while(bssize--)

        crc=(crc >> )^crc_tab32[(crc & 0xff) ^ *bs++];

    return crc ^ 0xffffffff;

}

//获得文件CRC

int calc_img_crc(TCHAR *pFileName, unsigned int *uiCrcValue)

{

    HANDLE hFile = CreateFile(pFileName, GENERIC_READ, FILE_SHARE_READ,  NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

    if(hFile == INVALID_HANDLE_VALUE)

    {

        return -;

    }

    const unsigned int size =  * ;

    unsigned char crcbuf[size];

    DWORD rdlen;

    unsigned int crc = ;//CRC初始值为0

    while(ReadFile(hFile, crcbuf, size, &rdlen, NULL), rdlen)

        crc = get_crc32(crc, crcbuf, rdlen);

    *uiCrcValue = crc;

    CloseHandle(hFile);

    return ;

}