CRC32.h

#ifndef _CRC_H #define _CRC_H /* source copy from gg's common.c */ static unsigned int crc32_table[256]; static int crc32_initialized = 0; static void crc32_make_table() { unsigned int h = 1; unsigned int i, j; memset(crc32_table, 0, sizeof(crc32_table)); for (i = 128; i; i >>= 1) { h = (h >> 1) ^ ((h & 1) ? 0xedb88320L : 0); for (j = 0; j < 256; j += 2 * i) crc32_table[i + j] = crc32_table[j] ^ h; } crc32_initialized = 1; } static unsigned int crc32(unsigned int crc, const unsigned char *buf, int len) { if (!crc32_initialized) crc32_make_table(); if (!buf || len < 0) return crc; crc ^= 0xffffffffL; while (len--) crc = (crc >> 8) ^ crc32_table[(crc ^ *buf++) & 0xff]; return crc ^ 0xffffffffL; } #endif //(_CRC_H) //int crcval=crc32(0, buff,sizeof(buff)); //使用方法