2 * uimage_padhdr.c : add zero paddings after the tail of uimage header
4 * Copyright (C) 2019 NOGUCHI Hiroshi <drvlabo@gmail.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License,
8 * version 2 as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
23 #include <arpa/inet.h>
27 /* from u-boot/include/image.h */
28 #define IH_MAGIC 0x27051956 /* Image Magic Number */
29 #define IH_NMLEN 32 /* Image Name Length */
32 * Legacy format image header,
33 * all data in network byte order (aka natural aka bigendian).
35 typedef struct image_header
{
36 uint32_t ih_magic
; /* Image Header Magic Number */
37 uint32_t ih_hcrc
; /* Image Header CRC Checksum */
38 uint32_t ih_time
; /* Image Creation Timestamp */
39 uint32_t ih_size
; /* Image Data Size */
40 uint32_t ih_load
; /* Data Load Address */
41 uint32_t ih_ep
; /* Entry Point Address */
42 uint32_t ih_dcrc
; /* Image Data CRC Checksum */
43 uint8_t ih_os
; /* Operating System */
44 uint8_t ih_arch
; /* CPU architecture */
45 uint8_t ih_type
; /* Image Type */
46 uint8_t ih_comp
; /* Compression Type */
47 uint8_t ih_name
[IH_NMLEN
]; /* Image Name */
51 /* default padding size */
52 #define IH_PAD_BYTES (32)
55 static void usage(char *prog
)
58 "%s -i <input_uimage_file> -o <output_file> [-l <padding bytes>]\n",
62 int main(int argc
, char *argv
[])
73 char *outfname
= NULL
;
74 int padsz
= IH_PAD_BYTES
;
77 while ((opt
= getopt(argc
, argv
, "i:o:l:")) != -1) {
86 ltmp
= strtol(optarg
, NULL
, 0);
95 if (!infname
|| !outfname
) {
100 if (stat(infname
, &statbuf
) < 0) {
102 "could not find input file. (errno = %d)\n", errno
);
106 filebuf
= malloc(statbuf
.st_size
+ padsz
);
108 fprintf(stderr
, "buffer allocation failed\n");
112 ifd
= open(infname
, O_RDONLY
);
115 "could not open input file. (errno = %d)\n", errno
);
119 ofd
= open(outfname
, O_WRONLY
| O_CREAT
, 0644);
122 "could not open output file. (errno = %d)\n", errno
);
126 rsz
= read(ifd
, filebuf
, sizeof(*imgh
));
127 if (rsz
!= sizeof(*imgh
)) {
129 "could not read input file (errno = %d).\n", errno
);
133 memset(&(filebuf
[sizeof(*imgh
)]), 0, padsz
);
135 rsz
= read(ifd
, &(filebuf
[sizeof(*imgh
) + padsz
]),
136 statbuf
.st_size
- sizeof(*imgh
));
137 if (rsz
!= (int32_t)(statbuf
.st_size
- sizeof(*imgh
))) {
139 "could not read input file (errno = %d).\n", errno
);
143 imgh
= (image_header_t
*)filebuf
;
146 crc_recalc
= crc32(0, filebuf
, sizeof(*imgh
) + padsz
);
147 imgh
->ih_hcrc
= htonl(crc_recalc
);
149 rsz
= write(ofd
, filebuf
, statbuf
.st_size
+ padsz
);
150 if (rsz
!= (int32_t)statbuf
.st_size
+ padsz
) {
152 "could not write output file (errnor = %d).\n", errno
);