83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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;
|
|
}
|