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rockbox/tools/scramble.c
Linus Nielsen Feltzing d569727aa7 Support iAudio X5V in the scrambler 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@9278 a1c6a512-1295-4272-9138-f99709370657
2006-03-27 08:31:34 +00:00

437 lines
12 KiB
C
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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>
#include <string.h>
#include "iriver.h"
int iaudio_encode(char *iname, char *oname, char *idstring);
enum
{
ARCHOS_PLAYER, /* and V1 recorder */
ARCHOS_V2RECORDER,
ARCHOS_FMRECORDER,
ARCHOS_ONDIO_SP,
ARCHOS_ONDIO_FM
};
int size_limit[] =
{
0x32000, /* ARCHOS_PLAYER */
0x64000, /* ARCHOS_V2RECORDER */
0x64000, /* ARCHOS_FMRECORDER */
0x64000, /* ARCHOS_ONDIO_SP */
0x64000 /* ARCHOS_ONDIO_FM */
};
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;
}
void usage(void)
{
printf("usage: scramble [options] <input file> <output file> [xor string]\n");
printf("options:\n"
"\t-fm Archos FM recorder format\n"
"\t-v2 Archos V2 recorder format\n"
"\t-ofm Archos Ondio FM recorder format\n"
"\t-osp Archos Ondio SP format\n"
"\t-neo SSI Neo format\n"
"\t-mm=X Archos Multimedia format (X values: A=JBMM, B=AV1xx, C=AV3xx)\n"
"\t-iriver iRiver format\n"
"\t-iaudiox5 iAudio X5 format\n"
"\t-iaudiox5v iAudio X5V format\n"
"\t-add=X Rockbox generic \"add-up\" checksum format\n"
"\t (X values: h100, h120, h140, h300, ipco, nano, ipvd\n"
"\t ip3g, ip4g, mini, x5)\n"
"\nNo option results in Archos standard player/recorder format.\n");
exit(1);
}
int main (int argc, char** argv)
{
unsigned long length,i,slen;
unsigned char *inbuf,*outbuf;
unsigned short crc=0;
unsigned long chksum=0; /* 32 bit checksum */
unsigned char header[24];
char *iname = argv[1];
char *oname = argv[2];
char *xorstring;
int headerlen = 6;
FILE* file;
int version;
unsigned long modelnum;
char modelname[5];
int model_id;
enum { none, scramble, xor, add } method = scramble;
model_id = ARCHOS_PLAYER;
if (argc < 3) {
usage();
}
if(!strcmp(argv[1], "-fm")) {
headerlen = 24;
iname = argv[2];
oname = argv[3];
version = 4;
model_id = ARCHOS_FMRECORDER;
}
else if(!strcmp(argv[1], "-v2")) {
headerlen = 24;
iname = argv[2];
oname = argv[3];
version = 2;
model_id = ARCHOS_V2RECORDER;
}
else if(!strcmp(argv[1], "-ofm")) {
headerlen = 24;
iname = argv[2];
oname = argv[3];
version = 8;
model_id = ARCHOS_ONDIO_FM;
}
else if(!strcmp(argv[1], "-osp")) {
headerlen = 24;
iname = argv[2];
oname = argv[3];
version = 16;
model_id = ARCHOS_ONDIO_SP;
}
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;
}
}
else if(!strncmp(argv[1], "-add=", 5)) {
iname = argv[2];
oname = argv[3];
method = add;
if(!strcmp(&argv[1][5], "h120"))
modelnum = 0;
else if(!strcmp(&argv[1][5], "h140"))
modelnum = 0; /* the same as the h120 */
else if(!strcmp(&argv[1][5], "h100"))
modelnum = 1;
else if(!strcmp(&argv[1][5], "h300"))
modelnum = 2;
else if(!strcmp(&argv[1][5], "ipco"))
modelnum = 3;
else if(!strcmp(&argv[1][5], "nano"))
modelnum = 4;
else if(!strcmp(&argv[1][5], "ipvd"))
modelnum = 5;
else if(!strcmp(&argv[1][5], "fp7x"))
modelnum = 6;
else if(!strcmp(&argv[1][5], "ip3g"))
modelnum = 7;
else if(!strcmp(&argv[1][5], "ip4g"))
modelnum = 8;
else if(!strcmp(&argv[1][5], "mini"))
modelnum = 9;
else if(!strcmp(&argv[1][5], "iax5"))
modelnum = 10;
else {
fprintf(stderr, "unsupported model: %s\n", &argv[1][5]);
return 2;
}
/* we store a 4-letter model name too, for humans */
strcpy(modelname, &argv[1][5]);
chksum = modelnum; /* start checksum calcs with this */
}
else if(!strcmp(argv[1], "-iriver")) {
/* iRiver code dealt with in the iriver.c code */
iname = argv[2];
oname = argv[3];
iriver_encode(iname, oname, FALSE);
return 0;
}
else if(!strcmp(argv[1], "-iaudiox5")) {
iname = argv[2];
oname = argv[3];
return iaudio_encode(iname, oname, "COWON_X5_FW");
}
else if(!strcmp(argv[1], "-iaudiox5v")) {
iname = argv[2];
oname = argv[3];
return iaudio_encode(iname, oname, "COWON_X5V_FW");
}
/* 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) >= size_limit[model_id])) {
printf("error: firmware image is %d bytes while max size is %d!\n",
length + headerlen,
size_limit[model_id]);
fclose(file);
return -1;
}
fseek(file,0,SEEK_SET);
inbuf = malloc(length);
if (method == xor)
outbuf = malloc(length*2);
else if(method == add)
outbuf = malloc(length + 8);
else
outbuf = malloc(length);
if ( !inbuf || !outbuf ) {
printf("out of memory!\n");
return -1;
}
if(length> 4) {
/* zero-fill the last 4 bytes to make sure there's no rubbish there
when we write the size-aligned file later */
memset(outbuf+length-4, 0, 4);
}
/* read file */
i=fread(inbuf,1,length,file);
if ( !i ) {
perror(iname);
return -1;
}
fclose(file);
switch (method)
{
case add:
for (i = 0; i < length; i++) {
/* add 8 unsigned bits but keep a 32 bit sum */
chksum += inbuf[i];
}
break;
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;
}
if(method != add) {
/* calculate checksum */
for (i=0;i<length;i++)
crc += inbuf[i];
}
memset(header, 0, sizeof header);
switch (method)
{
case add:
{
int2be(chksum, header); /* checksum, big-endian */
memcpy(&header[4], modelname, 4); /* 4 bytes model name */
memcpy(outbuf, inbuf, length); /* the input buffer to output*/
headerlen = 8;
}
break;
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((char *)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;
}
int iaudio_encode(char *iname, char *oname, char *idstring)
{
size_t len;
int length;
FILE *file;
unsigned char *outbuf;
int i;
unsigned char sum = 0;
file = fopen(iname, "rb");
if (!file) {
perror(iname);
return -1;
}
fseek(file,0,SEEK_END);
length = ftell(file);
fseek(file,0,SEEK_SET);
outbuf = malloc(length+0x1030);
if ( !outbuf ) {
printf("out of memory!\n");
return -1;
}
len = fread(outbuf+0x1030, 1, length, file);
if(len < length) {
perror(iname);
return -2;
}
memset(outbuf, 0, 0x1030);
strcpy((char *)outbuf, idstring);
for(i = 0; i < length;i++)
sum += outbuf[0x1030 + i];
int2be(length, &outbuf[0x1024]);
outbuf[0x102b] = sum;
fclose(file);
file = fopen(oname, "wb");
if (!file) {
perror(oname);
return -3;
}
len = fwrite(outbuf, 1, length+0x1030, file);
if(len < length) {
perror(oname);
return -4;
}
fclose(file);
}
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