b61d62b225
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8028 a1c6a512-1295-4272-9138-f99709370657
108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 by Christian Gmeiner
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*
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* This particular source code file is licensed under the X11 license. See the
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* bottom of the COPYING file for details on this license.
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*
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****************************************************************************/
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/* This little application updates the checksum of a modifized iAudio x5
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firmware bin.
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And this is how it works:
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The byte at offset 0x102b contains the 8-bit sum of all the bytes starting with the one at 0x1030.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define CHECKSUM_BIT 0x102b
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#define CHECKSUM_START 0x1030
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void usage(void) {
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printf("usage: iaudio <input file> <output file>\n");
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printf("\n\nThis tool updates the checksum of an iaudio fw bin\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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char byte = '\0';
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char checksum = '\0';
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unsigned long length, i;
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unsigned char* inbuf;
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char* iname = argv[1];
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char* oname = argv[2];
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FILE* pFile;
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if (argc < 2) {
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usage();
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}
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/* open file */
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pFile = fopen(iname, "rb");
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if (!pFile) {
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perror(oname);
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return -1;
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}
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/* print old checksum */
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fseek (pFile, CHECKSUM_BIT, SEEK_SET);
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byte = fgetc(pFile);
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printf("Old checksum: 0x%02x\n", byte & 0xff);
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/* get file size*/
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fseek(pFile,0,SEEK_END);
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length = ftell(pFile);
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fseek(pFile,0,SEEK_SET);
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/* try to allocate memory */
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inbuf = malloc(length);
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if (!inbuf) {
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printf("out of memory!\n");
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return -1;
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}
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/* read file */
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i = fread(inbuf, 1, length, pFile);
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if (!i) {
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perror(iname);
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return -1;
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}
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fclose(pFile);
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/* calculate new checksum */
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for (i = CHECKSUM_START; i < length; i++) {
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checksum += inbuf[i];
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}
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printf("New checksum: 0x%02x\n", checksum & 0xff);
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/* save new checksum */
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inbuf[CHECKSUM_BIT] = (unsigned char) checksum;
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/* save inbuf */
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pFile = fopen(oname,"wb");
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if (!pFile) {
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perror(oname);
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return -1;
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}
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i = fwrite(inbuf, 1, length, pFile);
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if (!i) {
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perror(oname);
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return -1;
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}
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fclose(pFile);
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return 0;
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}
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