mirror of
https://github.com/openwrt/openwrt.git
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156 lines
2.7 KiB
C
156 lines
2.7 KiB
C
/*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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static char *progname;
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static unsigned char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
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#define ERR(fmt, ...) do { \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt "\n", \
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progname, ## __VA_ARGS__ ); \
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} while (0)
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#define ERRS(fmt, ...) do { \
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int save = errno; \
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt ", %s\n", \
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progname, ## __VA_ARGS__, strerror(save)); \
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} while (0)
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#define BUF_SIZE (64 * 1024)
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#define ALIGN(_x,_y) (((_x) + ((_y) - 1)) & ~((_y) - 1))
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static int pad_image(char *name, uint32_t pad_mask)
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{
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char *buf;
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int fd;
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ssize_t in_len;
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ssize_t out_len;
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int ret = -1;
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buf = malloc(BUF_SIZE);
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if (!buf) {
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ERR("No memory for buffer");
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goto out;
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}
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fd = open(name, O_RDWR);
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if (fd < 0) {
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ERRS("Unable to open %s", name);
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goto free_buf;
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}
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in_len = lseek(fd, 0, SEEK_END);
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if (in_len < 0)
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goto close;
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memset(buf, '\xff', BUF_SIZE);
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out_len = in_len;
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while (pad_mask) {
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uint32_t mask;
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ssize_t t;
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int i;
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for (i = 10; i < 32; i++) {
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mask = 1UL << i;
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if (pad_mask & mask)
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break;
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}
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in_len = ALIGN(in_len, mask);
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for (i = 10; i < 32; i++) {
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mask = 1UL << i;
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if ((in_len & (mask - 1)) == 0)
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pad_mask &= ~mask;
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}
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printf("padding image to %08x\n", (unsigned int) in_len);
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while (out_len < in_len) {
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ssize_t len;
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len = in_len - out_len;
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if (len > BUF_SIZE)
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len = BUF_SIZE;
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t = write(fd, buf, len);
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if (t != len) {
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ERRS("Unable to write to %s", name);
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goto close;
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}
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out_len += len;
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}
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/* write out the JFFS end-of-filesystem marker */
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t = write(fd, eof_mark, 4);
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if (t != 4) {
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ERRS("Unable to write to %s", name);
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goto close;
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}
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out_len += 4;
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}
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ret = 0;
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close:
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close(fd);
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free_buf:
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free(buf);
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out:
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return ret;
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}
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int main(int argc, char* argv[])
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{
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uint32_t pad_mask;
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int ret = EXIT_FAILURE;
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int err;
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int i;
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progname = basename(argv[0]);
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if (argc < 2) {
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fprintf(stderr,
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"Usage: %s file [pad0] [pad1] [padN]\n",
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progname);
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goto out;
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}
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pad_mask = 0;
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for (i = 2; i < argc; i++)
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pad_mask |= strtoul(argv[i], NULL, 0) * 1024;
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if (pad_mask == 0)
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pad_mask = (4 * 1024) | (8 * 1024) | (64 * 1024) |
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(128 * 1024);
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err = pad_image(argv[1], pad_mask);
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if (err)
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goto out;
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ret = EXIT_SUCCESS;
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out:
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return ret;
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}
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