?? crc.c
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#include "crctable.h"/* CRC checksum calculation routine */unsigned long calc_crc( unsigned char * buf, int len){ unsigned long crc = 0xFFFFFFFF; for( ; len > 0; len--, buf++ ) crc = crc_tbl[(crc ^ *buf) & 0xFF] ^ ( crc >> 8 ); return( ~crc );}/* CRC checksum verification routine */int check_crc_buf( unsigned char *buf, int len ){ unsigned long crc; crc = calc_crc(buf, len); return( ( ( crc ) & 0xFF ) == buf[0] && ( ( crc >> 8 ) & 0xFF ) == buf[1] && ( ( crc >> 16 ) & 0xFF ) == buf[2] && ( ( crc >> 24 ) & 0xFF ) == buf[3] );}/* Add CRC32 */int add_crc32(unsigned char* data, int length){ unsigned long crc; crc = calc_crc(data, length); data[length] = (crc ) & 0xFF; data[length+1] = (crc >> 8) & 0xFF; data[length+2] = (crc >> 16) & 0xFF; data[length+3] = (crc >> 24) & 0xFF; return 0;}int calc_crc_buf( unsigned char *buf, int len ){ return (calc_crc(buf, len));}?? 快捷鍵說明
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