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/*
* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
*
* 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.
*
*/
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
static char *progname;
static unsigned int xtra_offset;
static unsigned char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
static unsigned char jffs2_pad_be[] = "\x19\x85\x20\x04\x04\x00\x00\x00\xc4\x94\xdb\xf4";
static unsigned char jffs2_pad_le[] = "\x85\x19\x04\x20\x00\x00\x00\x04\xa8\xfb\xa0\xb4";
static unsigned char *pad = eof_mark;
static int pad_len = sizeof(eof_mark);
#define ERR(fmt, ...) do { \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt "\n", \
progname, ## __VA_ARGS__ ); \
} while (0)
#define ERRS(fmt, ...) do { \
int save = errno; \
fflush(0); \
fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \
progname, ## __VA_ARGS__, strerror(save)); \
} while (0)
#define BUF_SIZE (64 * 1024)
#define ALIGN(_x,_y) (((_x) + ((_y) - 1)) & ~((_y) - 1))
static int pad_image(char *name, uint32_t pad_mask)
{
char *buf;
int fd;
ssize_t in_len;
ssize_t out_len;
int ret = -1;
buf = malloc(BUF_SIZE);
if (!buf) {
ERR("No memory for buffer");
goto out;
}
fd = open(name, O_RDWR);
if (fd < 0) {
ERRS("Unable to open %s", name);
goto free_buf;
}
in_len = lseek(fd, 0, SEEK_END);
if (in_len < 0)
goto close;
memset(buf, '\xff', BUF_SIZE);
in_len += xtra_offset;
out_len = in_len;
while (pad_mask) {
uint32_t mask;
ssize_t t;
int i;
for (i = 10; i < 32; i++) {
mask = 1UL << i;
if (pad_mask & mask)
break;
}
in_len = ALIGN(in_len, mask);
for (i = 10; i < 32; i++) {
mask = 1UL << i;
if ((in_len & (mask - 1)) == 0)
pad_mask &= ~mask;
}
printf("padding image to %08x\n", (unsigned int) in_len - xtra_offset);
while (out_len < in_len) {
ssize_t len;
len = in_len - out_len;
if (len > BUF_SIZE)
len = BUF_SIZE;
t = write(fd, buf, len);
if (t != len) {
ERRS("Unable to write to %s", name);
goto close;
}
out_len += len;
}
/* write out the JFFS end-of-filesystem marker */
t = write(fd, pad, pad_len);
if (t != pad_len) {
ERRS("Unable to write to %s", name);
goto close;
}
out_len += pad_len;
}
ret = 0;
close:
close(fd);
free_buf:
free(buf);
out:
return ret;
}
static int usage(void)
{
fprintf(stderr,
"Usage: %s file [<options>] [pad0] [pad1] [padN]\n"
"Options:\n"
" -x <offset>: Add an extra offset for padding data\n"
" -J: Use a fake big-endian jffs2 padding element instead of EOF\n"
" This is used to work around broken boot loaders that\n"
" try to parse the entire firmware area as one big jffs2\n"
" -j: (like -J, but little-endian instead of big-endian)\n"
"\n",
progname);
return EXIT_FAILURE;
}
int main(int argc, char* argv[])
{
char *image;
uint32_t pad_mask;
int ret = EXIT_FAILURE;
int err;
int ch, i;
progname = basename(argv[0]);
if (argc < 2)
return usage();
image = argv[1];
argv++;
argc--;
pad_mask = 0;
while ((ch = getopt(argc, argv, "x:Jj")) != -1) {
switch (ch) {
case 'x':
xtra_offset = strtoul(optarg, NULL, 0);
fprintf(stderr, "assuming %u bytes offset\n",
xtra_offset);
break;
case 'J':
pad = jffs2_pad_be;
pad_len = sizeof(jffs2_pad_be) - 1;
break;
case 'j':
pad = jffs2_pad_le;
pad_len = sizeof(jffs2_pad_le) - 1;
break;
default:
return usage();
}
}
for (i = optind; i < argc; i++)
pad_mask |= strtoul(argv[i], NULL, 0) * 1024;
if (pad_mask == 0)
pad_mask = (4 * 1024) | (8 * 1024) | (64 * 1024) |
(128 * 1024);
err = pad_image(image, pad_mask);
if (err)
goto out;
ret = EXIT_SUCCESS;
out:
return ret;
}
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