89 lines
2.3 KiB
C
89 lines
2.3 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) 2006 by Christian Hack
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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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extern void int2le(unsigned int val, unsigned char* addr);
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extern unsigned int le2int(unsigned char* buf);
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static FILE * openinfile( const char * filename )
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{
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FILE * F = fopen( filename, "rb" );
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if( F == NULL )
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{
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fprintf( stderr, "Couldn't open input file %s\n", filename );
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perror( "Error was " );
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exit( -1 );
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};
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return F;
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}
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static FILE * openoutfile( const char * filename )
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{
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FILE * F = fopen( filename, "wb" );
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if( F == NULL )
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{
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fprintf( stderr, "Couldn't open output file %s\n", filename );
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perror( "Error was " );
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exit( -1 );
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};
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return F;
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}
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int gigabeat_code(char *infile, char *outfile)
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{
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FILE *in, *out;
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unsigned long size = 0;
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unsigned long bytes_read;
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unsigned char buf[4];
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unsigned long data;
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unsigned long key = 0x19751217;
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in = openinfile(infile);
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out = openoutfile(outfile);
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while (!feof(in)) {
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bytes_read = fread(buf, 1, 4, in);
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/* Read in little-endian */
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data = le2int(buf);
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data = data ^ key;
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key = key + (key << 1);
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key = key + 0x19751217;
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size += bytes_read;
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/* Write out little-endian */
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int2le(data, buf);
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fwrite(buf, 1, bytes_read, out);
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}
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fprintf(stderr, "File processed successfully\n" );
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fclose(in);
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fclose(out);
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return(0);
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}
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