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/*
* Copyright (C) 2007
* pancake <pancake@youterm.com>
*
* 0xFFFF is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 0xFFFF is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0xFFFF; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "main.h"
#include <usb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int rf_extract(char *dev, off_t from, off_t to, char *file)
{
off_t i, blk = 0xfffff;
char buf[0xfffff];
FILE *fs = fopen(dev, "rb");
FILE *fd = fopen(file, "wb+");
if (from>to) {
printf("Bad range %lld - %lld for %s\n", from, to, file);
goto __rf_extract_exit;
}
if (fs == NULL) { perror(dev); goto __rf_extract_exit; }
if (fd == NULL) { perror(file); goto __rf_extract_exit; }
printf("%s: extracting...", file);
fflush(stdout);
fseek(fs, from, SEEK_SET);
for(i=from;i<to;i+=blk) {
int ret;
if (i+blk>to) blk = to-i;
ret = fread(buf, blk, 1, fs);
if (feof(fs)) break;
fwrite(buf, blk, 1, fd);
}
printf("\r%s: %lld bytes dumped from %s\n",
file, to-from, dev);
__rf_extract_exit:
if (fs) fclose(fs);
if (fd) fclose(fd);
return 1;
}
int rf_strip(char *file)
{
FILE *fd = fopen(file, "rw");
unsigned char buf[4096];
int ret;
off_t eof = 0;
if (!fd) {
fprintf(stderr, "Weird! can't open %s???\n", file);
exit(0);
}
printf("Stripping padding from %s... ", file);
fflush(stdout);
fseek(fd, 0, SEEK_END);
do {
fseek(fd, -4096, SEEK_CUR);
ret = fread(buf, 1, 4096, fd);
fseek(fd, -4096, SEEK_CUR);
for(ret--;ret>0;ret--)
if (buf[ret]!=0xff) {
fseek(fd, ret+1, SEEK_CUR);
eof = ftell(fd);
goto __done;
}
} while(1);
__done:
fclose(fd);
if (eof) truncate(file, eof);
printf("done at %d\n", (int)eof);
return 1;
}
int is_n800()
{
int n800 = 0;
unsigned char buf[4];
FILE *fd = fopen("/dev/mtd0", "rb");
if (!fd) {
fprintf(stderr, "Cannot open /dev/mtd0.\n");
exit(1);
}
fread(buf, 4, 1,fd);
if (!memcmp("\xff\xff\xff\xff", buf, 4))
n800 = 1;
fclose(fd);
return n800;
}
int reverse_extract_pieces(char *dir)
{
char reply;
chdir(dir);
rf_extract("/dev/mtd0", is_n800()?0x200:0, 0x003600, "xloader.bin");
rf_extract("/dev/mtd0", 0x004000, 0x01ffff, "secondary.bin");
rf_extract("/dev/mtd2", 0x000800, 0x200000, "zImage");
rf_extract("/dev/mtd3", 0x000000, 0x1D00000, "initfs.jffs2");
printf("\nWARNING: the rootfs extraction on n800 is known to be buggy! feedback is welcome.\n\n");
printf("Extract rootfs? (Y/n): "); fflush(stdout);
read(0, &reply, 1);
if (reply=='y'||reply=='Y')
rf_extract("/dev/mtd4", 0x000000, 0xffffff, "rootfs.jffs2");
else printf("*** Ignoring rootfs\n");
rf_strip("xloader.bin");
rf_strip("secondary.bin");
rf_strip("zImage");
rf_strip("initfs.jffs2");
printf("Identifying extracted files...\n");
printf("%s: xloader\n", fpid_file("xloader.bin"));
printf("%s: secondary.bin\n", fpid_file("secondary.bin"));
printf("%s: zImage\n", fpid_file("zImage"));
printf("%s: initfs.jffs2\n", fpid_file("initfs.jffs2"));
return 1;
}
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