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