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/* $OpenBSD: extract.c,v 1.1 2007/01/06 18:31:47 mglocker Exp $ */
/*
* Copyright (c) 2006 Marcus Glocker <mglocker@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
struct header {
char filename[64];
int filesize;
int fileoffset;
};
int
main(int argc, char *argv[])
{
int i, fdin, fdout, nfiles;
void *p;
struct header **h;
if (argc < 2) {
printf("%s <firmware file>\n", argv[0]);
exit(1);
}
/* open firmware file */
if ((fdin = open(argv[1], O_RDONLY)) == -1)
err(1, "open of input file failed");
/* read first header */
if (read(fdin, &nfiles, sizeof(nfiles)) < 1)
err(1, "first header parse failed");
nfiles = ntohl(nfiles);
/* allocate space for header struct */
if ((h = malloc(nfiles * sizeof(*h))) == NULL)
err(1, "malloc");
for (i = 0; i < nfiles; i++) {
if ((h[i] = malloc(sizeof(struct header))) == NULL)
err(1, "malloc");
}
/* read header */
for (i = 0; i < nfiles; i++) {
if (read(fdin, h[i]->filename, sizeof(h[i]->filename)) < 1)
err(1, "filename header read failed\n");
if (read(fdin, &h[i]->filesize, sizeof(h[i]->filesize)) < 1)
err(1, "filesize header read failed\n");
h[i]->filesize = htonl(h[i]->filesize);
if (read(fdin, &h[i]->fileoffset, sizeof(h[i]->fileoffset)) < 1)
err(1, "fileoffset header read failed\n");
h[i]->fileoffset = htonl(h[i]->fileoffset);
}
/* write each file */
for (i = 0; i < nfiles; i++) {
if ((fdout = open(h[i]->filename, O_CREAT|O_TRUNC|O_RDWR, 0644))
== -1)
err(1, "open of output file failed");
if ((p = malloc(h[i]->filesize)) == NULL)
err(1, "malloc");
if (lseek(fdin, h[i]->fileoffset, SEEK_SET) == -1)
err(1, "lseek");
if (read(fdin, p, h[i]->filesize) < 1)
err(1, "read from input file failed");
if (write(fdout, p, h[i]->filesize) < 1)
err(1, "write to output file failed");
free(p);
close(fdout);
printf("extracting %s (filesize %d, fileoffset %d)\n",
h[i]->filename, h[i]->filesize, h[i]->fileoffset);
}
/* free header space */
for (i = 0; i < nfiles; i++)
free(h[i]);
free(h);
/* game over */
close (fdin);
return (0);
}
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