/* Check header CRC of the uImage header */
static int image_check_hcrc(const image_header_t *hdr)
{
uint32_t hcrc;
image_header_t header;
/* Copy header so we can blank CRC field for re-calculation */
memcpy(&header, hdr, sizeof(header));
image_set_hcrc(&header, 0);
hcrc = crc32(0, &header, sizeof(header));
return (hcrc == image_get_hcrc(hdr));
}
int image_check_hcrc(const image_header_t *hdr)
{
ulong hcrc;
ulong len = image_get_header_size();
image_header_t header;
/* Copy header so we can blank CRC field for re-calculation */
memmove(&header, (char *)hdr, image_get_header_size());
image_set_hcrc(&header, 0);
hcrc = crc32(0, (unsigned char *)&header, len);
return (hcrc == image_get_hcrc(hdr));
}
static int image_verify_header(char *ptr, int fd)
{
int len, nread;
char *data;
uint32_t checksum;
image_header_t *hdr = (image_header_t *)ptr;
char buf[PAGE_SIZE];
if (image_get_magic(hdr) != IH_MAGIC)
return 0;
data = (char *)hdr;
len = image_get_header_size();
checksum = image_get_hcrc(hdr);
hdr->ih_hcrc = htonl(0); /* clear for re-calculation */
if (crc32(0, data, len) != checksum) {
fprintf(stderr,
"%s: Maybe image found but it has bad header checksum!\n",
cmdname);
return 0;
}
len = image_get_size(hdr);
checksum = 0;
while (len > 0) {
nread = read(fd, buf, MIN(len,PAGE_SIZE));
if (nread != MIN(len,PAGE_SIZE)) {
fprintf(stderr,
"%s: Error while reading: %s\n",
cmdname, strerror(errno));
exit(EXIT_FAILURE);
}
checksum = crc32(checksum, buf, nread);
len -= nread;
}
if (checksum != image_get_dcrc(hdr)) {
fprintf (stderr,
"%s: Maybe image found but it has corrupted data!\n",
cmdname);
return 0;
}
return 1;
}
