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