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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Christian Hack
*
* 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>
extern void int2le(unsigned int val, unsigned char* addr);
extern unsigned int le2int(unsigned char* buf);
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 gigabeat_code(char *infile, char *outfile)
{
FILE *in, *out;
unsigned long size = 0;
unsigned long bytes_read;
unsigned char buf[4];
unsigned long data;
unsigned long key = 0x19751217;
in = openinfile(infile);
out = openoutfile(outfile);
while (!feof(in)) {
bytes_read = fread(buf, 1, 4, in);
/* Read in little-endian */
data = le2int(buf);
data = data ^ key;
key = key + (key << 1);
key = key + 0x19751217;
size += bytes_read;
/* Write out little-endian */
int2le(data, buf);
fwrite(buf, 1, bytes_read, out);
}
fprintf(stderr, "File processed successfully\n" );
fclose(in);
fclose(out);
return(0);
}
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