84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
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/***************************************************************************
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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) 2002 by Bj<EFBFBD>rn Stenberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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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int main (int argc, char** argv)
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{
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unsigned long length,i,slen;
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unsigned char *inbuf,*outbuf;
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FILE* file;
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if (argc < 3) {
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printf("usage: %s <input file> <output file>\n",argv[0]);
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return -1;
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}
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/* open file and check size */
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file = fopen(argv[1],"rb");
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if (!file) {
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perror(argv[1]);
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return -1;
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}
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fseek(file,0,SEEK_END);
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length = ftell(file) - 6; /* skip 6-byte header */
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fseek(file,6,SEEK_SET);
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inbuf = malloc(length);
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outbuf = malloc(length);
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if ( !inbuf || !outbuf ) {
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printf("out of memory!\n");
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return -1;
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}
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/* read file */
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i=fread(inbuf,1,length,file);
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if ( !i ) {
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perror(argv[1]);
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return -1;
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}
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fclose(file);
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/* descramble */
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slen = length/4;
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for (i = 0; i < length; i++) {
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unsigned long addr = ((i % slen) << 2) + i/slen;
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unsigned char data = inbuf[i];
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data = ~((data >> 1) | ((data << 7) & 0x80)); /* poor man's ROR */
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outbuf[addr] = data;
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}
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/* write file */
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file = fopen(argv[2],"wb");
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if ( !file ) {
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perror(argv[2]);
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return -1;
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}
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if ( !fwrite(outbuf,length,1,file) ) {
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perror(argv[2]);
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return -1;
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}
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fclose(file);
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free(inbuf);
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free(outbuf);
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return 0;
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}
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