add something like the agilent crc implementation

[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"

struct fw_header {
	unsigned int unknown[8];
	unsigned int len;
	char ident[4];
	unsigned int offset;
	char desc[128];
};

void parse_fw(unsigned char *fw, unsigned int off) {
	struct fw_header *header = (struct fw_header*)(fw + off);
	static unsigned int last_off;
	int i;

	printf("Address in file: 0x%08x, Difference to last: %u\n", off, off-last_off);
	printf("Unknown: ");
	for (i = 0; i < 8; i++)
		printf("0x%08x ", header->unknown[i]);

	printf("\n");

	printf("Length: %u, possible next entry at: 0x%08x\n", header->len, off + header->len + 22);

	printf("Identifier: %.4s\n", header->ident);

	printf("Offset: 0x%08x\n", header->offset);

	printf("Descriptiom: %s\n", header->desc);

	printf("\n");
	last_off = off;
}

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

	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;
	}

#if 0
	parse_fw(fw, 0x0);
	parse_fw(fw, 0x555c0);
	parse_fw(fw, 0x5940e);
#endif

	crc = rsb_crc(0, fw, statbuf.st_size-4);

	printf("Length: %ld, Checksum: 0x%08x\n", statbuf.st_size-4, crc);

	exit(0);
}