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c语言实现crc32算法
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static const unsigned int crc32tab[] = {
0x00000000l, 0x77073096l, 0xee0e612cl, 0x990951bal,
0x076dc419l, 0x706af48fl, 0xe963a535l, 0x9e6495a3l,
0x0edb8832l, 0x79dcb8a4l, 0xe0d5e91el, 0x97d2d988l,
0x09b64c2bl, 0x7eb17cbdl, 0xe7b82d07l, 0x90bf1d91l,
0x1db71064l, 0x6ab020f2l, 0xf3b97148l, 0x84be41del,
0x1adad47dl, 0x6ddde4ebl, 0xf4d4b551l, 0x83d385c7l,
0x136c9856l, 0x646ba8c0l, 0xfd62f97al, 0x8a65c9ecl,
0x14015c4fl, 0x63066cd9l, 0xfa0f3d63l, 0x8d080df5l,
0x3b6e20c8l, 0x4c69105el, 0xd56041e4l, 0xa2677172l,
0x3c03e4d1l, 0x4b04d447l, 0xd20d85fdl, 0xa50ab56bl,
0x35b5a8fal, 0x42b2986cl, 0xdbbbc9d6l, 0xacbcf940l,
0x32d86ce3l, 0x45df5c75l, 0xdcd60dcfl, 0xabd13d59l,
0x26d930acl, 0x51de003al, 0xc8d75180l, 0xbfd06116l,
0x21b4f4b5l, 0x56b3c423l, 0xcfba9599l, 0xb8bda50fl,
0x2802b89el, 0x5f058808l, 0xc60cd9b2l, 0xb10be924l,
0x2f6f7c87l, 0x58684c11l, 0xc1611dabl, 0xb6662d3dl,
0x76dc4190l, 0x01db7106l, 0x98d220bcl, 0xefd5102al,
0x71b18589l, 0x06b6b51fl, 0x9fbfe4a5l, 0xe8b8d433l,
0x7807c9a2l, 0x0f00f934l, 0x9609a88el, 0xe10e9818l,
0x7f6a0dbbl, 0x086d3d2dl, 0x91646c97l, 0xe6635c01l,
0x6b6b51f4l, 0x1c6c6162l, 0x856530d8l, 0xf262004el,
0x6c0695edl, 0x1b01a57bl, 0x8208f4c1l, 0xf50fc457l,
0x65b0d9c6l, 0x12b7e950l, 0x8bbeb8eal, 0xfcb9887cl,
0x62dd1ddfl, 0x15da2d49l, 0x8cd37cf3l, 0xfbd44c65l,
0x4db26158l, 0x3ab551cel, 0xa3bc0074l, 0xd4bb30e2l,
0x4adfa541l, 0x3dd895d7l, 0xa4d1c46dl, 0xd3d6f4fbl,
0x4369e96al, 0x346ed9fcl, 0xad678846l, 0xda60b8d0l,
0x44042d73l, 0x33031de5l, 0xaa0a4c5fl, 0xdd0d7cc9l,
0x5005713cl, 0x270241aal, 0xbe0b1010l, 0xc90c2086l,
0x5768b525l, 0x206f85b3l, 0xb966d409l, 0xce61e49fl,
0x5edef90el, 0x29d9c998l, 0xb0d09822l, 0xc7d7a8b4l,
0x59b33d17l, 0x2eb40d81l, 0xb7bd5c3bl, 0xc0ba6cadl,
0xedb88320l, 0x9abfb3b6l, 0x03b6e20cl, 0x74b1d29al,
0xead54739l, 0x9dd277afl, 0x04db2615l, 0x73dc1683l,
0xe3630b12l, 0x94643b84l, 0x0d6d6a3el, 0x7a6a5aa8l,
0xe40ecf0bl, 0x9309ff9dl, 0x0a00ae27l, 0x7d079eb1l,
0xf00f9344l, 0x8708a3d2l, 0x1e01f268l, 0x6906c2fel,
0xf762575dl, 0x806567cbl, 0x196c3671l, 0x6e6b06e7l,
0xfed41b76l, 0x89d32be0l, 0x10da7a5al, 0x67dd4accl,
0xf9b9df6fl, 0x8ebeeff9l, 0x17b7be43l, 0x60b08ed5l,
0xd6d6a3e8l, 0xa1d1937el, 0x38d8c2c4l, 0x4fdff252l,
0xd1bb67f1l, 0xa6bc5767l, 0x3fb506ddl, 0x48b2364bl,
0xd80d2bdal, 0xaf0a1b4cl, 0x36034af6l, 0x41047a60l,
0xdf60efc3l, 0xa867df55l, 0x316e8eefl, 0x4669be79l,
0xcb61b38cl, 0xbc66831al, 0x256fd2a0l, 0x5268e236l,
0xcc0c7795l, 0xbb0b4703l, 0x220216b9l, 0x5505262fl,
0xc5ba3bbel, 0xb2bd0b28l, 0x2bb45a92l, 0x5cb36a04l,
0xc2d7ffa7l, 0xb5d0cf31l, 0x2cd99e8bl, 0x5bdeae1dl,
0x9b64c2b0l, 0xec63f226l, 0x756aa39cl, 0x026d930al,
0x9c0906a9l, 0xeb0e363fl, 0x72076785l, 0x05005713l,
0x95bf4a82l, 0xe2b87a14l, 0x7bb12bael, 0x0cb61b38l,
0x92d28e9bl, 0xe5d5be0dl, 0x7cdcefb7l, 0x0bdbdf21l,
0x86d3d2d4l, 0xf1d4e242l, 0x68ddb3f8l, 0x1fda836el,
0x81be16cdl, 0xf6b9265bl, 0x6fb077e1l, 0x18b74777l,
0x88085ae6l, 0xff0f6a70l, 0x66063bcal, 0x11010b5cl,
0x8f659effl, 0xf862ae69l, 0x616bffd3l, 0x166ccf45l,
0xa00ae278l, 0xd70dd2eel, 0x4e048354l, 0x3903b3c2l,
0xa7672661l, 0xd06016f7l, 0x4969474dl, 0x3e6e77dbl,
0xaed16a4al, 0xd9d65adcl, 0x40df0b66l, 0x37d83bf0l,
0xa9bcae53l, 0xdebb9ec5l, 0x47b2cf7fl, 0x30b5ffe9l,
0xbdbdf21cl, 0xcabac28al, 0x53b39330l, 0x24b4a3a6l,
0xbad03605l, 0xcdd70693l, 0x54de5729l, 0x23d967bfl,
0xb3667a2el, 0xc4614ab8l, 0x5d681b02l, 0x2a6f2b94l,
0xb40bbe37l, 0xc30c8ea1l, 0x5a05df1bl, 0x2d02ef8dl
};
static unsigned int crc32( const unsigned char *buf, unsigned int size)
{
unsigned int i, crc;
crc = 0xffffffff;
for (i = 0; i < size; i++)
crc = crc32tab[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);
return crc^0xffffffff;
}
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