133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
|
|
|
|
extract_fw.c - extract the main firmware image from a Sansa V2 (AMS) firmware
|
|
file
|
|
|
|
Copyright (C) Dave Chapman 2008
|
|
|
|
This program 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.
|
|
|
|
This program 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 this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
|
|
|
|
*/
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
|
|
/* Win32 compatibility */
|
|
#ifndef O_BINARY
|
|
#define O_BINARY 0
|
|
#endif
|
|
|
|
|
|
static off_t filesize(int fd) {
|
|
struct stat buf;
|
|
|
|
if (fstat(fd,&buf) < 0) {
|
|
perror("[ERR] Checking filesize of input file");
|
|
return -1;
|
|
} else {
|
|
return(buf.st_size);
|
|
}
|
|
}
|
|
|
|
static uint32_t get_uint32le(unsigned char* p)
|
|
{
|
|
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
printf("Usage: extract_fw <firmware file> <output file>\n");
|
|
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
char *infile, *outfile;
|
|
int fdin, fdout;
|
|
off_t len;
|
|
uint32_t n;
|
|
unsigned char* buf;
|
|
uint32_t firmware_size;
|
|
|
|
if(argc != 3) {
|
|
usage();
|
|
}
|
|
|
|
infile = argv[1];
|
|
outfile = argv[2];
|
|
|
|
/* Open the firmware file */
|
|
fdin = open(infile,O_RDONLY|O_BINARY);
|
|
|
|
if (fdin < 0) {
|
|
fprintf(stderr,"[ERR] Could not open %s for reading\n",infile);
|
|
return 1;
|
|
}
|
|
|
|
if ((len = filesize(fdin)) < 0)
|
|
return 1;
|
|
|
|
/* We will need no more memory than the total size plus the bootloader size
|
|
padded to a boundary */
|
|
if ((buf = malloc(len)) == NULL) {
|
|
fprintf(stderr,"[ERR] Could not allocate buffer for input file (%d bytes)\n",(int)len);
|
|
return 1;
|
|
}
|
|
|
|
n = read(fdin, buf, len);
|
|
|
|
if (n != (uint32_t)len) {
|
|
fprintf(stderr,"[ERR] Could not read firmware file\n");
|
|
return 1;
|
|
}
|
|
|
|
close(fdin);
|
|
|
|
/* Get the firmware size */
|
|
if (get_uint32le(&buf[0x04])==0x0000f000)
|
|
firmware_size = get_uint32le(&buf[0x10]); /* v2 format */
|
|
else
|
|
firmware_size = get_uint32le(&buf[0x0c]); /* v1 format */
|
|
|
|
fdout = open(outfile, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666);
|
|
|
|
if (fdout < 0) {
|
|
fprintf(stderr,"[ERR] Could not open %s for writing\n",outfile);
|
|
return 1;
|
|
}
|
|
|
|
n = write(fdout, buf + 0x400, firmware_size);
|
|
|
|
if (n != (uint32_t)firmware_size) {
|
|
fprintf(stderr,"[ERR] Could not write firmware block\n");
|
|
return 1;
|
|
}
|
|
|
|
/* Clean up */
|
|
close(fdout);
|
|
free(buf);
|
|
|
|
return 0;
|
|
}
|