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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* 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>
int main (int argc, char** argv)
{
unsigned long length,i,slen;
unsigned char *inbuf,*outbuf;
FILE* file;
if (argc < 3) {
printf("usage: %s <input file> <output file>\n",argv[0]);
return -1;
}
/* open file and check size */
file = fopen(argv[1],"rb");
if (!file) {
perror(argv[1]);
return -1;
}
fseek(file,0,SEEK_END);
length = ftell(file) - 6; /* skip 6-byte header */
fseek(file,6,SEEK_SET);
inbuf = malloc(length);
outbuf = malloc(length);
if ( !inbuf || !outbuf ) {
printf("out of memory!\n");
return -1;
}
/* read file */
i=fread(inbuf,1,length,file);
if ( !i ) {
perror(argv[1]);
return -1;
}
fclose(file);
/* descramble */
slen = length/4;
for (i = 0; i < length; i++) {
unsigned long addr = ((i % slen) << 2) + i/slen;
unsigned char data = inbuf[i];
data = ~((data >> 1) | ((data << 7) & 0x80)); /* poor man's ROR */
outbuf[addr] = data;
}
/* write file */
file = fopen(argv[2],"wb");
if ( !file ) {
perror(argv[2]);
return -1;
}
if ( !fwrite(outbuf,length,1,file) ) {
perror(argv[2]);
return -1;
}
fclose(file);
free(inbuf);
free(outbuf);
return 0;
}
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