c6be818212
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18706 a1c6a512-1295-4272-9138-f99709370657
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
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extract_fw.c - extract the main firmware image from a Sansa V2 (AMS) firmware
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file
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Copyright (C) Dave Chapman 2008
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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/* Win32 compatibility */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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static off_t filesize(int fd) {
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struct stat buf;
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if (fstat(fd,&buf) < 0) {
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perror("[ERR] Checking filesize of input file");
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return -1;
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} else {
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return(buf.st_size);
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}
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}
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static uint32_t get_uint32le(unsigned char* p)
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{
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return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
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}
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void usage(void)
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{
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printf("Usage: extract_fw <firmware file> <output file>\n");
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exit(1);
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}
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int main(int argc, char* argv[])
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{
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char *infile, *outfile;
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int fdin, fdout;
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off_t len;
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uint32_t n;
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unsigned char* buf;
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uint32_t firmware_size;
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if(argc != 3) {
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usage();
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}
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infile = argv[1];
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outfile = argv[2];
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/* Open the firmware file */
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fdin = open(infile,O_RDONLY|O_BINARY);
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if (fdin < 0) {
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fprintf(stderr,"[ERR] Could not open %s for reading\n",infile);
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return 1;
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}
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if ((len = filesize(fdin)) < 0)
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return 1;
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/* We will need no more memory than the total size plus the bootloader size
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padded to a boundary */
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if ((buf = malloc(len)) == NULL) {
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fprintf(stderr,"[ERR] Could not allocate buffer for input file (%d bytes)\n",(int)len);
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return 1;
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}
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n = read(fdin, buf, len);
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if (n != (uint32_t)len) {
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fprintf(stderr,"[ERR] Could not read firmware file\n");
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return 1;
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}
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close(fdin);
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/* Get the firmware size */
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firmware_size = get_uint32le(&buf[0x0c]);
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fdout = open(outfile, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666);
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if (fdout < 0) {
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fprintf(stderr,"[ERR] Could not open %s for writing\n",outfile);
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return 1;
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}
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n = write(fdout, buf + 0x400, firmware_size);
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if (n != (uint32_t)firmware_size) {
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fprintf(stderr,"[ERR] Could not write firmware block\n");
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return 1;
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}
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/* Clean up */
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close(fdout);
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free(buf);
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return 0;
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}
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