print info if checksum is correct

[rsbs2] / firmware.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <strings.h>
#include "rsb-crc.h"

int main(int argc, char **argv)
{
	struct stat statbuf;
	unsigned char *fw;
	int fd;
	int remaining;
	int ret;
	unsigned int crc, oldcrc;

	if (argc != 2) {
		fprintf(stderr,"Syntax: %s firmware.bin\n", argv[0]);
		exit(1);
	}

	if (stat(argv[1], &statbuf) == -1) {
		perror("stat");
		exit(1);
	}

	if ((fd = open(argv[1], O_RDONLY)) == -1) {
		perror("open");
		exit(1);
	}

	if ((fw = malloc(statbuf.st_size)) == NULL) {
		perror("malloc");
		exit(1);
	}

	bzero(fw, statbuf.st_size);

	remaining = statbuf.st_size;

	while(remaining) {
		if ((ret = read(fd, fw + (statbuf.st_size - remaining), remaining)) == -1) {
			perror("read");
			exit(1);
		}
		remaining -= ret;
	}

	ret = rsb_crc2(fw, statbuf.st_size, 0x55335053, &crc);
	oldcrc = (unsigned int)*((unsigned int*)(fw + statbuf.st_size - 4));

	printf("Checksum: 0x%08x (%s), should be: 0x%08x\n",
		crc,
		(ret ? "NOT OK" : "OK"),
		oldcrc);

	exit(0);
}