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/*
* uimage_padhdr.c : add zero paddings after the tail of uimage header
*
* Copyright (C) 2019 NOGUCHI Hiroshi <drvlabo@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <zlib.h>
/* from u-boot/include/image.h */
#define IH_MAGIC 0x27051956 /* Image Magic Number */
#define IH_NMLEN 32 /* Image Name Length */
/*
* Legacy format image header,
* all data in network byte order (aka natural aka bigendian).
*/
typedef struct image_header {
uint32_t ih_magic; /* Image Header Magic Number */
uint32_t ih_hcrc; /* Image Header CRC Checksum */
uint32_t ih_time; /* Image Creation Timestamp */
uint32_t ih_size; /* Image Data Size */
uint32_t ih_load; /* Data Load Address */
uint32_t ih_ep; /* Entry Point Address */
uint32_t ih_dcrc; /* Image Data CRC Checksum */
uint8_t ih_os; /* Operating System */
uint8_t ih_arch; /* CPU architecture */
uint8_t ih_type; /* Image Type */
uint8_t ih_comp; /* Compression Type */
uint8_t ih_name[IH_NMLEN]; /* Image Name */
} image_header_t;
/* default padding size */
#define IH_PAD_BYTES (32)
static void usage(char *prog)
{
fprintf(stderr,
"%s -i <input_uimage_file> -o <output_file> [-l <padding bytes>]\n",
prog);
}
int main(int argc, char *argv[])
{
struct stat statbuf;
u_int8_t *filebuf;
int ifd;
int ofd;
ssize_t rsz;
u_int32_t crc_recalc;
image_header_t *imgh;
int opt;
char *infname = NULL;
char *outfname = NULL;
int padsz = IH_PAD_BYTES;
int ltmp;
while ((opt = getopt(argc, argv, "i:o:l:")) != -1) {
switch (opt) {
case 'i':
infname = optarg;
break;
case 'o':
outfname = optarg;
break;
case 'l':
ltmp = strtol(optarg, NULL, 0);
if (ltmp > 0)
padsz = ltmp;
break;
default:
break;
}
}
if (!infname || !outfname) {
usage(argv[0]);
exit(1);
}
ifd = open(infname, O_RDONLY);
if (ifd < 0) {
fprintf(stderr,
"could not open input file. (errno = %d)\n", errno);
exit(1);
}
ofd = open(outfname, O_WRONLY | O_CREAT, 0644);
if (ofd < 0) {
fprintf(stderr,
"could not open output file. (errno = %d)\n", errno);
exit(1);
}
if (fstat(ifd, &statbuf) < 0) {
fprintf(stderr,
"could not fstat input file. (errno = %d)\n", errno);
exit(1);
}
filebuf = malloc(statbuf.st_size + padsz);
if (!filebuf) {
fprintf(stderr, "buffer allocation failed\n");
exit(1);
}
rsz = read(ifd, filebuf, sizeof(*imgh));
if (rsz != sizeof(*imgh)) {
fprintf(stderr,
"could not read input file (errno = %d).\n", errno);
exit(1);
}
memset(&(filebuf[sizeof(*imgh)]), 0, padsz);
rsz = read(ifd, &(filebuf[sizeof(*imgh) + padsz]),
statbuf.st_size - sizeof(*imgh));
if (rsz != (int32_t)(statbuf.st_size - sizeof(*imgh))) {
fprintf(stderr,
"could not read input file (errno = %d).\n", errno);
exit(1);
}
imgh = (image_header_t *)filebuf;
imgh->ih_hcrc = 0;
crc_recalc = crc32(0, filebuf, sizeof(*imgh) + padsz);
imgh->ih_hcrc = htonl(crc_recalc);
rsz = write(ofd, filebuf, statbuf.st_size + padsz);
if (rsz != (int32_t)statbuf.st_size + padsz) {
fprintf(stderr,
"could not write output file (errnor = %d).\n", errno);
exit(1);
}
return 0;
}
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