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padjffs2: add a different kind of padding (using standard jffs2 elements) to work around broken boot loaders for kernel partitions

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Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 38804
This commit is contained in:
Felix Fietkau 2013-11-14 19:04:44 +00:00
parent b7914344ad
commit cc8350c5ec
1 changed files with 49 additions and 17 deletions
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66
tools/padjffs2/src/padjffs2.c
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@ -21,6 +21,10 @@
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); \
@ -105,12 +109,12 @@ static int pad_image(char *name, uint32_t pad_mask)
}
/* write out the JFFS end-of-filesystem marker */
t = write(fd, eof_mark, 4);
if (t != 4) {
t = write(fd, pad, pad_len);
if (t != pad_len) {
ERRS("Unable to write to %s", name);
goto close;
}
out_len += 4;
out_len += pad_len;
}
ret = 0;
@ -123,39 +127,67 @@ 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 i;
int ch, i;
progname = basename(argv[0]);
if (argc < 2) {
fprintf(stderr,
"Usage: %s file [-x <xtra offset>] [pad0] [pad1] [padN]\n",
progname);
goto out;
}
if (argc < 2)
return usage();
image = argv[1];
argv++;
argc--;
pad_mask = 0;
for (i = 2; i < argc; i++) {
if (i == 2 && strcmp(argv[i], "-x") == 0) {
i++;
xtra_offset = strtoul(argv[i], NULL, 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);
continue;
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(argv[1], pad_mask);
err = pad_image(image, pad_mask);
if (err)
goto out;