You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
156 lines
2.7 KiB
C
156 lines
2.7 KiB
C
/*
|
|
* 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 char eof_mark[4] = {0xde, 0xad, 0xc0, 0xde};
|
|
|
|
#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);
|
|
|
|
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);
|
|
|
|
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, eof_mark, 4);
|
|
if (t != 4) {
|
|
ERRS("Unable to write to %s", name);
|
|
goto close;
|
|
}
|
|
out_len += 4;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
close:
|
|
close(fd);
|
|
free_buf:
|
|
free(buf);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
uint32_t pad_mask;
|
|
int ret = EXIT_FAILURE;
|
|
int err;
|
|
int i;
|
|
|
|
progname = basename(argv[0]);
|
|
|
|
if (argc < 2) {
|
|
fprintf(stderr,
|
|
"Usage: %s file [pad0] [pad1] [padN]\n",
|
|
progname);
|
|
goto out;
|
|
}
|
|
|
|
pad_mask = 0;
|
|
for (i = 2; 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);
|
|
if (err)
|
|
goto out;
|
|
|
|
ret = EXIT_SUCCESS;
|
|
|
|
out:
|
|
return ret;
|
|
}
|