87409a2619
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@27789 a1c6a512-1295-4272-9138-f99709370657
147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
|
|
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
|
|
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
|
|
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
|
|
* \/ \/ \/ \/ \/
|
|
* $Id$
|
|
*
|
|
* Copyright (C) 2003 by Jörg Hohensohn
|
|
*
|
|
* Tool to extract the scrambled image out of an Archos flash ROM dump
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* 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 <inttypes.h>
|
|
|
|
#define UINT8 unsigned char
|
|
#define UINT16 unsigned short
|
|
#define UINT32 unsigned long
|
|
|
|
#define IMAGE_HEADER 0x6000 // a 32 byte header in front of the software image
|
|
#define IMAGE_START 0x6020 // software image position in Flash
|
|
|
|
|
|
// place a 32 bit value into memory, big endian
|
|
void Write32(UINT8* pByte, UINT32 value)
|
|
{
|
|
pByte[0] = (UINT8)(value >> 24);
|
|
pByte[1] = (UINT8)(value >> 16);
|
|
pByte[2] = (UINT8)(value >> 8);
|
|
pByte[3] = (UINT8)(value);
|
|
}
|
|
|
|
|
|
// read a 32 bit value from memory, big endian
|
|
UINT32 Read32(UINT8* pByte)
|
|
{
|
|
UINT32 value = 0;
|
|
|
|
value |= (UINT32)pByte[0] << 24;
|
|
value |= (UINT32)pByte[1] << 16;
|
|
value |= (UINT32)pByte[2] << 8;
|
|
value |= (UINT32)pByte[3];
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
// entry point
|
|
int main(int argc, char* argv[])
|
|
{
|
|
FILE* pInFile;
|
|
FILE* pOutFile;
|
|
UINT8 aHeader[6];
|
|
UINT8 aImage[256*1024];
|
|
UINT32 i;
|
|
UINT32 uiSize, uiStart;
|
|
UINT16 usChecksum = 0;
|
|
|
|
if (argc < 2)
|
|
{
|
|
printf("Extract the software image out of an original Archos Flash ROM dump.\n");
|
|
printf("Result is a scrambled file, use the descramble tool to get the binary,\n");
|
|
printf(" always without the -fm option, even if processing an FM software.\n\n");
|
|
printf("Usage: extract <flash dump file> <output file>\n");
|
|
printf("Example: extract internal_rom_2000000-203FFFF.bin archos.ajz\n");
|
|
exit(0);
|
|
}
|
|
|
|
pInFile = fopen(argv[1], "rb");
|
|
if (pInFile == NULL)
|
|
{
|
|
printf("Error opening input file %s\n", argv[1]);
|
|
exit(1);
|
|
}
|
|
|
|
if (fread(aImage, 1, sizeof(aImage), pInFile) != sizeof(aImage))
|
|
{
|
|
printf("Error reading input file %s, must be 256kB in size.\n", argv[1]);
|
|
fclose(pInFile);
|
|
exit(2);
|
|
}
|
|
fclose(pInFile);
|
|
|
|
// find out about the type
|
|
uiStart = Read32(aImage + 8);
|
|
uiSize = Read32(aImage + 12); // booted ROM image
|
|
if (uiStart == 0x02000100 && uiSize > 20000)
|
|
{ // Player has no loader, starts directly with the image
|
|
uiStart = 0x0100;
|
|
}
|
|
else
|
|
{ // Recorder / FM / V2 Recorder
|
|
uiStart = IMAGE_START;
|
|
uiSize = Read32(aImage + IMAGE_HEADER + 4); // size record of header
|
|
}
|
|
|
|
// sanity check
|
|
if (uiSize > sizeof(aImage) - uiStart || uiSize < 40000)
|
|
{
|
|
printf("Error: Impossible image size &d bytes.\n", uiSize);
|
|
exit(3);
|
|
}
|
|
|
|
// generate checksum
|
|
for (i=0; i<uiSize; i++)
|
|
{
|
|
UINT8 byte;
|
|
byte = aImage[uiStart + i];
|
|
byte = ~((byte >> 1) | ((byte << 7) & 0x80)); /* poor man's ROR */
|
|
usChecksum += byte;
|
|
}
|
|
|
|
// make header
|
|
Write32(aHeader + 2, usChecksum); // checksum in 5th and 6th byte
|
|
Write32(aHeader, uiSize); // size in first 4 bytes
|
|
|
|
pOutFile = fopen(argv[2], "wb");
|
|
if (pOutFile == NULL)
|
|
{
|
|
printf("Error opening output file %s\n", argv[2]);
|
|
exit(4);
|
|
}
|
|
|
|
if (fwrite(aHeader, 1, sizeof(aHeader), pOutFile) != sizeof(aHeader)
|
|
|| fwrite(aImage + uiStart, 1, uiSize, pOutFile) != uiSize)
|
|
{
|
|
printf("Write error\n");
|
|
fclose(pOutFile);
|
|
exit(5);
|
|
}
|
|
|
|
fclose(pOutFile);
|
|
|
|
return 0;
|
|
}
|