blob: 240f9e36a21f7e7af433e6ec3e04707a1d9fbb4b [file] [log] [blame]
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2004 by Dave Hooper
*
* This particular source code file is licensed under the X11 license. See the
* bottom of the COPYING file for details on this license.
*
* Original code from http://www.beermex.com/@spc/ihpfirm.src.zip
* Details at http://www.rockbox.org/twiki/bin/view/Main/IriverToolsGuide
*
****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "iriver.h"
const unsigned char munge[] = {
0x7a, 0x36, 0xc4, 0x43, 0x49, 0x6b, 0x35, 0x4e, 0xa3, 0x46, 0x25, 0x84,
0x4d, 0x73, 0x74, 0x61
};
const unsigned char header_modify[] = "* IHPFIRM-DECODED ";
const char * const models[] = { "iHP-100", "iHP-120/iHP-140", "H300 series",
NULL };
/* aligns with models array; expected min firmware size */
const unsigned int firmware_minsize[] = { 0x100000, 0x100000, 0x200000 };
/* aligns with models array; expected max firmware size */
const unsigned int firmware_maxsize[] = { 0x200000, 0x200000, 0x400000 };
const unsigned char header[][16] = {
{ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 },
{ 0x20, 0x03, 0x08, 0x27, 0x24, 0x00, 0x02, 0x30, 0x19, 0x17, 0x65, 0x73,
0x85, 0x32, 0x83, 0x22 },
{ 0x20, 0x04, 0x03, 0x27, 0x20, 0x50, 0x01, 0x70, 0x80, 0x30, 0x80, 0x06,
0x30, 0x19, 0x17, 0x65 }
};
static int testheader( const unsigned char * const data )
{
const unsigned char * const d = data+16;
const char * const * m = models;
int index = 0;
while( *m )
{
if( memcmp( header[ index ], d, 16 ) == 0 )
return index;
index++;
m++;
};
return -1;
};
static void modifyheader( unsigned char * data )
{
const unsigned char * h = header_modify;
int i;
for( i=0; i<512; i++ )
{
if( *h == '\0' )
h = header_modify;
*data++ ^= *h++;
};
};
static FILE * openinfile( const char * filename )
{
FILE * F = fopen( filename, "rb" );
if( F == NULL )
{
fprintf( stderr, "Couldn't open input file %s\n", filename );
perror( "Error was " );
exit( -1 );
};
return F;
};
static FILE * openoutfile( const char * filename )
{
FILE * F = fopen( filename, "wb" );
if( F == NULL )
{
fprintf( stderr, "Couldn't open output file %s\n", filename );
perror( "Error was " );
exit( -1 );
};
return F;
};
int iriver_decode(char *infile_name, char *outfile_name, BOOL modify,
enum striptype stripmode )
{
FILE * infile = NULL;
FILE * outfile = NULL;
int i = -1;
unsigned char headerdata[512];
unsigned long dwLength1, dwLength2, dwLength3, fp = 0;
unsigned char blockdata[16+16];
unsigned char out[16];
unsigned char newmunge;
signed long lenread;
int s = 0;
unsigned char * pChecksums, * ppChecksums = 0;
unsigned char ck;
infile = openinfile(infile_name);
outfile = openoutfile(outfile_name);
lenread = fread( headerdata, 1, 512, infile );
if( lenread != 512 )
{
fprintf( stderr, "This doesn't look like a valid encrypted iHP "
"firmware - reason: header length\n" );
exit( -1 );
};
i = testheader( headerdata );
if( i == -1 )
{
fprintf( stderr, "This firmware is for an unknown model, or is not"
" a valid encrypted iHP firmware\n" );
exit( -1 );
};
fprintf( stderr, "Model %s\n", models[ i ] );
dwLength1 = headerdata[0] | (headerdata[1]<<8) |
(headerdata[2]<<16) | (headerdata[3]<<24);
dwLength2 = headerdata[4] | (headerdata[5]<<8) |
(headerdata[6]<<16) | (headerdata[7]<<24);
dwLength3 = headerdata[8] | (headerdata[9]<<8) |
(headerdata[10]<<16) | (headerdata[11]<<24);
if( dwLength1 < firmware_minsize[ i ] ||
dwLength1 > firmware_maxsize[ i ] ||
dwLength2 < firmware_minsize[ i ] ||
dwLength2 > dwLength1 ||
dwLength3 > dwLength1 ||
dwLength2>>9 != dwLength3 ||
dwLength2+dwLength3+512 != dwLength1 )
{
fprintf( stderr, "This doesn't look like a valid encrypted "
"iHP firmware - reason: file 'length' data\n" );
exit( -1 );
};
pChecksums = ppChecksums = (unsigned char *)( malloc( dwLength3 ) );
if( modify )
{
modifyheader( headerdata );
};
if( stripmode == STRIP_NONE )
fwrite( headerdata, 512, 1, outfile );
memset( blockdata, 0, 16 );
ck = 0;
while( ( fp < dwLength2 ) &&
( lenread = fread( blockdata+16, 1, 16, infile ) ) == 16 )
{
fp += 16;
for( i=0; i<16; ++i )
{
newmunge = blockdata[16+i] ^ munge[i];
out[i] = newmunge ^ blockdata[i];
blockdata[i] = newmunge;
ck += out[i];
}
if( fp > ESTF_SIZE || stripmode != STRIP_HEADER_CHECKSUM_ESTF )
{
fwrite( out+4, 1, 12, outfile );
fwrite( out, 1, 4, outfile );
}
else
{
if( ESTF_SIZE - fp < 16 )
{
memcpy( out+4, blockdata+16, 12 );
memcpy( out, blockdata+28, 4 );
fwrite( blockdata+16+ESTF_SIZE-fp, 1, ESTF_SIZE-fp, outfile );
}
}
if( s == 496 )
{
s = 0;
memset( blockdata, 0, 16 );
*ppChecksums++ = ck;
ck = 0;
}
else
s+=16;
};
if( fp != dwLength2 )
{
fprintf( stderr, "This doesn't look like a valid encrypted "
"iHP firmware - reason: 'length2' mismatch\n" );
exit( -1 );
};
fp = 0;
ppChecksums = pChecksums;
while( ( fp < dwLength3 ) &&
( lenread = fread( blockdata, 1, 32, infile ) ) > 0 )
{
fp += lenread;
if( stripmode == STRIP_NONE )
fwrite( blockdata, 1, lenread, outfile );
if( memcmp( ppChecksums, blockdata, lenread ) != 0 )
{
fprintf( stderr, "This doesn't look like a valid encrypted "
"iHP firmware - reason: Checksum mismatch!" );
exit( -1 );
};
ppChecksums += lenread;
};
if( fp != dwLength3 )
{
fprintf( stderr, "This doesn't look like a valid encrypted "
"iHP firmware - reason: 'length3' mismatch\n" );
exit( -1 );
};
fprintf( stderr, "File decoded correctly and all checksums matched!\n" );
switch( stripmode )
{
default:
case STRIP_NONE:
fprintf(stderr, "Output file contains all headers and "
"checksums\n");
break;
case STRIP_HEADER_CHECKSUM:
fprintf( stderr, "NB: output file contains only ESTFBINR header"
" and decoded firmware code\n" );
break;
case STRIP_HEADER_CHECKSUM_ESTF:
fprintf( stderr, "NB: output file contains only raw decoded "
"firmware code\n" );
break;
};
return 0;
};
int iriver_encode(char *infile_name, char *outfile_name, BOOL modify )
{
FILE * infile = NULL;
FILE * outfile = NULL;
int i = -1;
unsigned char headerdata[512];
unsigned long dwLength1, dwLength2, dwLength3, fp = 0;
unsigned char blockdata[16+16];
unsigned char out[16];
unsigned char newmunge;
signed long lenread;
int s = 0;
unsigned char * pChecksums, * ppChecksums;
unsigned char ck;
infile = openinfile(infile_name);
outfile = openoutfile(outfile_name);
lenread = fread( headerdata, 1, 512, infile );
if( lenread != 512 )
{
fprintf( stderr, "This doesn't look like a valid decoded "
"iHP firmware - reason: header length\n" );
exit( -1 );
};
if( modify )
{
modifyheader( headerdata ); /* reversible */
};
i = testheader( headerdata );
if( i == -1 )
{
fprintf( stderr, "This firmware is for an unknown model, or is not"
" a valid decoded iHP firmware\n" );
exit( -1 );
};
fprintf( stderr, "Model %s\n", models[ i ] );
dwLength1 = headerdata[0] | (headerdata[1]<<8) |
(headerdata[2]<<16) | (headerdata[3]<<24);
dwLength2 = headerdata[4] | (headerdata[5]<<8) |
(headerdata[6]<<16) | (headerdata[7]<<24);
dwLength3 = headerdata[8] | (headerdata[9]<<8) |
(headerdata[10]<<16) | (headerdata[11]<<24);
if( dwLength1 < firmware_minsize[i] ||
dwLength1 > firmware_maxsize[i] ||
dwLength2 < firmware_minsize[i] ||
dwLength2 > dwLength1 ||
dwLength3 > dwLength1 ||
dwLength2+dwLength3+512 != dwLength1 )
{
fprintf( stderr, "This doesn't look like a valid decoded iHP"
" firmware - reason: file 'length' data\n" );
exit( -1 );
};
pChecksums = ppChecksums = (unsigned char *)( malloc( dwLength3 ) );
fwrite( headerdata, 512, 1, outfile );
memset( blockdata, 0, 16 );
ck = 0;
while( ( fp < dwLength2 ) &&
( lenread = fread( blockdata+16, 1, 16, infile ) ) == 16 )
{
fp += 16;
for( i=0; i<16; ++i )
{
newmunge = blockdata[16+((12+i)&0xf)] ^ blockdata[i];
out[i] = newmunge ^ munge[i];
ck += blockdata[16+i];
blockdata[i] = newmunge;
};
fwrite( out, 1, 16, outfile );
if( s == 496 )
{
s = 0;
memset( blockdata, 0, 16 );
*ppChecksums++ = ck;
ck = 0;
}
else
s+=16;
};
if( fp != dwLength2 )
{
fprintf( stderr, "This doesn't look like a valid decoded "
"iHP firmware - reason: 'length1' mismatch\n" );
exit( -1 );
};
/* write out remainder w/out applying descrambler */
fp = 0;
lenread = dwLength3;
ppChecksums = pChecksums;
while( ( fp < dwLength3) &&
( lenread = fwrite( ppChecksums, 1, lenread, outfile ) ) > 0 )
{
fp += lenread;
ppChecksums += lenread;
lenread = dwLength3 - fp;
};
if( fp != dwLength3 )
{
fprintf( stderr, "This doesn't look like a valid decoded "
"iHP firmware - reason: 'length2' mismatch\n" );
exit( -1 );
};
fprintf( stderr, "File encoded successfully and checksum table built!\n" );
return 0;
};