|
,0x93,0x94,0x9d,0x9a,0x27,0x20,0x29,0x2e,
0x3b,0x3c,0x35,0x32,0x1f,0x18,0x11,0x16,0x03,0x04,
0x0d,0x0a,0x57,0x50,0x59,0x5e,0x4b,0x4c,0x45,0x42,
0x6f,0x68,0x61,0x66,0x73,0x74,0x7d,0x7a,0x89,0x8e,
0x87,0x80,0x95,0x92,0x9b,0x9c,0xb1,0xb6,0xbf,0xb8,
0xad,0xaa,0xa3,0xa4,0xf9,0xfe,0xf7,0xf0,0xe5,0xe2,
0xeb,0xec,0xc1,0xc6,0xcf,0xc8,0xdd,0xda,0xd3,0xd4,
0x69,0x6e,0x67,0x60,0x75,0x72,0x7b,0x7c,0x51,0x56,
0x5f,0x58,0x4d,0x4a,0x43,0x44,0x19,0x1e,0x17,0x10,
0x05,0x02,0x0b,0x0c,0x21,0x26,0x2f,0x28,0x3d,0x3a,
0x33,0x34,0x4e,0x49,0x40,0x47,0x52,0x55,0x5c,0x5b,
0x76,0x71,0x78,0x7f,0x6a,0x6d,0x64,0x63,0x3e,0x39,
0x30,0x37,0x22,0x25,0x2c,0x2b,0x06,0x01,0x08,0x0f,
0x1a,0x1d,0x14,0x13,0xae,0xa9,0xa0,0xa7,0xb2,0xb5,
0xbc,0xbb,0x96,0x91,0x98,0x9f,0x8a,0x8d,0x84,0x83,
0xde,0xd9,0xd0,0xd7,0xc2,0xc5,0xcc,0xcb,0xe6,0xe1,
0xe8,0xef,0xfa,0xfd,0xf4,0xf3
};
……
BYTE Result = CheckTable[*byteData];
for(UINT i=1;i
{
Result = Result^(*(byteData+i));
Result = CheckTable[Result];
}
……
return Result;//返回计算出来的CRC校验和。
}
该函数的两个入口形参BYTE *byteData和 UINT nCount分别表示要计算CRC校验码的数据流和该数据流的长度。函数返回值为计算出来的CRC校验码，其他函数只须简单的调用此函数即可得到关于某段数据序列的校验码，下面是为BMP 位图设置印鉴的部分主要代码：
……
//首先读取文件到缓存中去，并得到文件的长度
file.Open(FileName,CFile::modeReadWrite);
int FileLen=file.GetLength();
//为缓存动态分配内存空间
BYTE* buf;
buf=new BYTE [FileLen];
file.SeekToBegin();
file.Read(buf,FileLen);
|