/*************************************************************************** * __________ __ ___. * 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 #include #include #include "iriver.h" #include "gigabeat.h" int iaudio_decode(char *iname, char *oname); void usage(void) { printf("usage: descramble [options] \n"); printf("options:\n" "\t-fm Archos FM recorder format\n" "\t-v2 Archos V2 recorder format\n" "\t-mm=X Archos Multimedia format (X values: A=JBMM, B=AV1xx, C=AV3xx)\n" "\t-iriver iRiver format\n" "\t-gigabeat Toshiba Gigabeat format\n" "\t-iaudio iAudio format\n" "\nNo option assumes Archos standard player/recorder format.\n"); exit(1); } int main (int argc, char** argv) { unsigned long length,i,slen; unsigned char *inbuf,*outbuf; char *iname = argv[1]; char *oname = argv[2]; unsigned char header[32]; int headerlen = 6; int descramble = 1; FILE* file; if (argc < 3) { usage(); } if (!strcmp(argv[1], "-fm") || !strcmp(argv[1], "-v2")) { headerlen = 24; iname = argv[2]; oname = argv[3]; } if (!strcmp(argv[1], "-mm")) { headerlen = 16; iname = argv[2]; oname = argv[3]; descramble = 0; } if(!strcmp(argv[1], "-iriver")) { /* iRiver code dealt with in the iriver.c code */ iname = argv[2]; oname = argv[3]; iriver_decode(iname, oname, FALSE, STRIP_NONE); return 0; } if(!strcmp(argv[1], "-gigabeat")) { iname = argv[2]; oname = argv[3]; gigabeat_code(iname, oname); return 0; } if(!strcmp(argv[1], "-iaudio")) { iname = argv[2]; oname = argv[3]; return iaudio_decode(iname, oname); } /* open file and check size */ file = fopen(iname,"rb"); if (!file) { perror(oname); return -1; } fseek(file,0,SEEK_END); length = ftell(file) - headerlen; /* skip header */ fseek(file,0,SEEK_SET); i = fread(header, 1, headerlen, file); if ( !i ) { perror(iname); return -1; } 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(iname); return -1; } fclose(file); if (descramble) { /* 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; } } else { void* tmpptr; unsigned int j=0; int stringlen = 32; int unpackedsize; unsigned char xorstring[32]; unpackedsize = header[4] | header[5] << 8; unpackedsize |= header[6] << 16 | header[7] << 24; length = header[8] | header[9] << 8; length |= header[10] << 16 | header[11] << 24; /* calculate the xor string used */ for (i=0; i top) { top = bytecount[c]; topchar = c; } } xorstring[i] = topchar; } printf("XOR string: %.*s\n", stringlen, xorstring); /* xor the buffer */ for (i=0; i j) src -= 0x1000; for (x=0; x