2 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published
6 * by the Free Software Foundation.
18 #include <sys/types.h>
21 static char *progname;
22 static unsigned int xtra_offset;
23 static unsigned char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
25 #define ERR(fmt, ...) do { \
27 fprintf(stderr, "[%s] *** error: " fmt "\n", \
28 progname, ## __VA_ARGS__ ); \
31 #define ERRS(fmt, ...) do { \
34 fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \
35 progname, ## __VA_ARGS__, strerror(save)); \
38 #define BUF_SIZE (64 * 1024)
39 #define ALIGN(_x,_y) (((_x) + ((_y) - 1)) & ~((_y) - 1))
41 static int pad_image(char *name, uint32_t pad_mask)
49 buf = malloc(BUF_SIZE);
51 ERR("No memory for buffer");
55 fd = open(name, O_RDWR);
57 ERRS("Unable to open %s", name);
61 in_len = lseek(fd, 0, SEEK_END);
65 memset(buf, '\xff', BUF_SIZE);
67 in_len += xtra_offset;
75 for (i = 10; i < 32; i++) {
81 in_len = ALIGN(in_len, mask);
83 for (i = 10; i < 32; i++) {
85 if ((in_len & (mask - 1)) == 0)
89 printf("padding image to %08x\n", (unsigned int) in_len - xtra_offset);
91 while (out_len < in_len) {
94 len = in_len - out_len;
98 t = write(fd, buf, len);
100 ERRS("Unable to write to %s", name);
107 /* write out the JFFS end-of-filesystem marker */
108 t = write(fd, eof_mark, 4);
110 ERRS("Unable to write to %s", name);
126 int main(int argc, char* argv[])
129 int ret = EXIT_FAILURE;
133 progname = basename(argv[0]);
137 "Usage: %s file [-x <xtra offset>] [pad0] [pad1] [padN]\n",
143 for (i = 2; i < argc; i++) {
144 if (i == 2 && strcmp(argv[i], "-x") == 0) {
146 xtra_offset = strtoul(argv[i], NULL, 0);
147 fprintf(stderr, "assuming %u bytes offset\n",
151 pad_mask |= strtoul(argv[i], NULL, 0) * 1024;
155 pad_mask = (4 * 1024) | (8 * 1024) | (64 * 1024) |
158 err = pad_image(argv[1], pad_mask);