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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
void int2le(unsigned int val, unsigned char* addr)
{
addr[0] = val & 0xFF;
addr[1] = (val >> 8) & 0xff;
addr[2] = (val >> 16) & 0xff;
addr[3] = (val >> 24) & 0xff;
}
void int2be(unsigned int val, unsigned char* addr)
{
addr[0] = (val >> 24) & 0xff;
addr[1] = (val >> 16) & 0xff;
addr[2] = (val >> 8) & 0xff;
addr[3] = val & 0xFF;
}
int main (int argc, char** argv)
{
unsigned long length,i,slen;
unsigned char *inbuf,*outbuf;
unsigned short crc=0;
unsigned char header[24];
unsigned char *iname = argv[1];
unsigned char *oname = argv[2];
unsigned char *xorstring;
int headerlen = 6;
FILE* file;
int version;
enum { none, scramble, xor } method = scramble;
if (argc < 3) {
printf("usage: %s [options] <input file> <output file> [xor string]\n",argv[0]);
printf("options:\n");
printf("\t-fm Archos FM recorder format\n");
printf("\t-v2 Archos V2 recorder format\n");
printf("\t-neo SSI Neo format\n");
printf("\t-mm=X Archos Multimedia format (X values: A=JBMM, B=AV1xx, C=AV3xx)\n");
printf("\nNo option results in Archos standard player/recorder format.\n");
return -1;
}
if(!strcmp(argv[1], "-fm")) {
headerlen = 24;
iname = argv[2];
oname = argv[3];
version = 4;
}
else if(!strcmp(argv[1], "-v2")) {
headerlen = 24;
iname = argv[2];
oname = argv[3];
version = 2;
}
else if(!strcmp(argv[1], "-neo")) {
headerlen = 17;
iname = argv[2];
oname = argv[3];
method = none;
}
else if(!strncmp(argv[1], "-mm=", 4)) {
headerlen = 16;
iname = argv[2];
oname = argv[3];
method = xor;
version = argv[1][4];
if (argc > 4)
xorstring = argv[4];
else {
printf("Multimedia needs an xor string\n");
return -1;
}
}
/* open file */
file = fopen(iname,"rb");
if (!file) {
perror(iname);
return -1;
}
fseek(file,0,SEEK_END);
length = ftell(file);
length = (length + 3) & ~3; /* Round up to nearest 4 byte boundary */
if ((method == scramble) && ((length + headerlen) >= 0x32000)) {
printf("error: max firmware size is 200KB!\n");
fclose(file);
return -1;
}
fseek(file,0,SEEK_SET);
inbuf = malloc(length);
if (method == xor)
outbuf = malloc(length*2);
else
outbuf = malloc(length);
if ( !inbuf || !outbuf ) {
printf("out of memory!\n");
return -1;
}
/* read file */
i=fread(inbuf,1,length,file);
if ( !i ) {
perror(iname);
return -1;
}
fclose(file);
switch (method)
{
case scramble:
slen = length/4;
for (i = 0; i < length; i++) {
unsigned long addr = (i >> 2) + ((i % 4) * slen);
unsigned char data = inbuf[i];
data = ~((data << 1) | ((data >> 7) & 1)); /* poor man's ROL */
outbuf[addr] = data;
}
break;
case xor:
/* "compress" */
slen = 0;
for (i=0; i<length; i++) {
if (!(i&7))
outbuf[slen++] = 0xff; /* all data is uncompressed */
outbuf[slen++] = inbuf[i];
}
break;
}
/* calculate checksum */
for (i=0;i<length;i++)
crc += inbuf[i];
memset(header, 0, sizeof header);
switch (method)
{
case scramble:
if (headerlen == 6) {
int2be(length, header);
header[4] = (crc >> 8) & 0xff;
header[5] = crc & 0xff;
}
else {
header[0] =
header[1] =
header[2] =
header[3] = 0xff; /* ??? */
header[6] = (crc >> 8) & 0xff;
header[7] = crc & 0xff;
header[11] = version;
header[15] = headerlen; /* really? */
int2be(length, &header[20]);
}
break;
case xor:
{
int xorlen = strlen(xorstring);
/* xor data */
for (i=0; i<slen; i++)
outbuf[i] ^= xorstring[i & (xorlen-1)];
/* calculate checksum */
for (i=0; i<slen; i++)
crc += outbuf[i];
header[0] = header[2] = 'Z';
header[1] = header[3] = version;
int2le(length, &header[4]);
int2le(slen, &header[8]);
int2le(crc, &header[12]);
length = slen;
break;
}
#define MY_FIRMWARE_TYPE "Rockbox"
#define MY_HEADER_VERSION 1
default:
strncpy(header,MY_FIRMWARE_TYPE,9);
header[9]='\0'; /*shouldn't have to, but to be SURE */
header[10]=MY_HEADER_VERSION&0xFF;
header[11]=(crc>>8)&0xFF;
header[12]=crc&0xFF;
int2be(sizeof(header), &header[12]);
break;
}
/* write file */
file = fopen(oname,"wb");
if ( !file ) {
perror(oname);
return -1;
}
if ( !fwrite(header,headerlen,1,file) ) {
perror(oname);
return -1;
}
if ( !fwrite(outbuf,length,1,file) ) {
perror(oname);
return -1;
}
fclose(file);
free(inbuf);
free(outbuf);
return 0;
}
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