padjffs2: add a different kind of padding (using standard jffs2 elements) to work...
authorFelix Fietkau <nbd@openwrt.org>
Thu, 14 Nov 2013 19:04:44 +0000 (19:04 +0000)
committerFelix Fietkau <nbd@openwrt.org>
Thu, 14 Nov 2013 19:04:44 +0000 (19:04 +0000)
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 38804

tools/padjffs2/src/padjffs2.c

index aa932ef..59c7625 100644 (file)
 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();
                }
-               pad_mask |= strtoul(argv[i], NULL, 0) * 1024;
        }
 
+       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;