quote:

#include <stdio.h>
#include <string.h>
unsigned long crc_table[256];
int crc_table_computed=0;
void make_crc_table(void){
unsigned long c;
int n, k;
        for (n = 0; n < 256; n++) {
          c = (unsigned long) n;
          for (k = 0; k < 8; k++) {
            if (c & 1) {
              c = 0xedb88320L ^ (c >> 1);
            } else {
              c = c >> 1;
            }
          }
          crc_table[n] = c;
        }
        crc_table_computed = 1;
}
unsigned long update_crc(unsigned long crc, unsigned char *buf, int len){
        unsigned long c = crc ^ 0xffffffffL;
        int n;
        if (!crc_table_computed)
          make_crc_table();
        for (n = 0; n < len; n++) {
          c = crc_table[(c ^ buf[n]) & 0xff] ^ (c >> 8);
        }
        return c ^ 0xffffffffL;
      }
      /* Return the CRC of the bytes buf[0..len-1]. */
      unsigned long crc(unsigned char *buf, int len)
      {
        return update_crc(0L, buf, len);
}
unsigned long crc_res(char *way,char *name){
    char f[256];
    unsigned long crc = 0L;
    unsigned char buffer[255];
    int len;
    FILE *fil;
    strcpy(f,way);
    f[strlen(way)-1]='\0';
    strcat(f,name);
    fil=fopen(f,"rb");
    do{
      len=fread(buffer,sizeof(char), 254, fil);
      crc = update_crc(crc, buffer, 254);
    }while (len==254);
      fclose(fil);
  return crc;
}
int main(int argc, char *argv[])
{
    printf("%ld",crc_res(argv[1],argv[2]));
    return 0;
}