Björn Stenberg | e1715c2 | 2002-03-28 14:34:13 +0000 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * __________ __ ___. |
| 3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| 4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| 5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| 6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| 7 | * \/ \/ \/ \/ \/ |
| 8 | * $Id$ |
| 9 | * |
| 10 | * Copyright (C) 2002 by Björn Stenberg |
| 11 | * |
| 12 | * All files in this archive are subject to the GNU General Public License. |
| 13 | * See the file COPYING in the source tree root for full license agreement. |
| 14 | * |
| 15 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 16 | * KIND, either express or implied. |
| 17 | * |
| 18 | ****************************************************************************/ |
| 19 | |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | |
| 23 | int main (int argc, char** argv) |
| 24 | { |
| 25 | unsigned long length,i,slen; |
| 26 | unsigned char *inbuf,*outbuf; |
| 27 | unsigned short crc=0; |
| 28 | unsigned char header[6]; |
| 29 | FILE* file; |
| 30 | |
| 31 | if (argc < 3) { |
| 32 | printf("usage: %s <input file> <output file>\n",argv[0]); |
| 33 | return -1; |
| 34 | } |
| 35 | |
| 36 | /* open file */ |
| 37 | file = fopen(argv[1],"rb"); |
| 38 | if (!file) { |
| 39 | perror(argv[1]); |
| 40 | return -1; |
| 41 | } |
| 42 | fseek(file,0,SEEK_END); |
| 43 | length = ftell(file); |
| 44 | fseek(file,0,SEEK_SET); |
| 45 | inbuf = malloc(length); |
| 46 | outbuf = malloc(length); |
| 47 | if ( !inbuf || !outbuf ) { |
| 48 | printf("out of memory!\n"); |
| 49 | return -1; |
| 50 | } |
| 51 | |
| 52 | /* read file */ |
| 53 | i=fread(inbuf,1,length,file); |
| 54 | if ( !i ) { |
| 55 | perror(argv[1]); |
| 56 | return -1; |
| 57 | } |
| 58 | fclose(file); |
| 59 | |
| 60 | /* scramble */ |
| 61 | slen = length/4; |
| 62 | for (i = 0; i < length; i++) { |
| 63 | unsigned long addr = (i >> 2) + ((i % 4) * slen); |
| 64 | unsigned char data = inbuf[i]; |
| 65 | data = ~((data << 1) | ((data >> 7) & 1)); /* poor man's ROL */ |
| 66 | outbuf[addr] = data; |
| 67 | } |
| 68 | |
| 69 | /* calculate checksum */ |
| 70 | for (i=0;i<length;i++) |
| 71 | crc += inbuf[i]; |
| 72 | |
| 73 | /* make header */ |
| 74 | header[0] = (length >> 24) & 0xff; |
| 75 | header[1] = (length >> 16) & 0xff; |
| 76 | header[2] = (length >> 8) & 0xff; |
| 77 | header[3] = length & 0xff; |
| 78 | header[4] = (crc >> 8) & 0xff; |
| 79 | header[5] = crc & 0xff; |
| 80 | |
| 81 | /* write file */ |
| 82 | file = fopen(argv[2],"wb"); |
| 83 | if ( !file ) { |
| 84 | perror(argv[2]); |
| 85 | return -1; |
| 86 | } |
| 87 | if ( !fwrite(header,6,1,file) ) { |
| 88 | perror(argv[2]); |
| 89 | return -1; |
| 90 | } |
| 91 | if ( !fwrite(outbuf,length,1,file) ) { |
| 92 | perror(argv[2]); |
| 93 | return -1; |
| 94 | } |
| 95 | fclose(file); |
| 96 | |
| 97 | free(inbuf); |
| 98 | free(outbuf); |
| 99 | |
| 100 | return 0; |
| 101 | } |