nkeynes@31 | 1 | /**
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nkeynes@31 | 2 | * $Id: cdi.c,v 1.2 2005-12-25 08:24:11 nkeynes Exp $
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nkeynes@31 | 3 | *
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nkeynes@31 | 4 | * CDI CD-image file support
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nkeynes@31 | 5 | *
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nkeynes@31 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@31 | 7 | *
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nkeynes@31 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@31 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@31 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@31 | 11 | * (at your option) any later version.
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nkeynes@31 | 12 | *
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nkeynes@31 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@31 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@31 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@31 | 16 | * GNU General Public License for more details.
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nkeynes@31 | 17 | */
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nkeynes@1 | 18 |
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nkeynes@1 | 19 | #include <stdlib.h>
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nkeynes@1 | 20 | #include <stdio.h>
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nkeynes@1 | 21 | #include <stdint.h>
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nkeynes@1 | 22 | #include <fcntl.h>
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nkeynes@1 | 23 | #include <errno.h>
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nkeynes@1 | 24 | #include <sys/stat.h>
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nkeynes@1 | 25 | #include "cdi.h"
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nkeynes@1 | 26 |
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nkeynes@1 | 27 | #define CDI_V2 0x80000004
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nkeynes@1 | 28 | #define CDI_V3 0x80000005
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nkeynes@1 | 29 |
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nkeynes@1 | 30 | static char track_start_marker[20] = { 0,0,1,0,0,0,255,255,255,255,
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nkeynes@1 | 31 | 0,0,1,0,0,0,255,255,255,255 };
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nkeynes@1 | 32 |
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nkeynes@1 | 33 | struct cdi_trailer {
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nkeynes@1 | 34 | uint32_t cdi_version;
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nkeynes@1 | 35 | uint32_t header_offset;
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nkeynes@1 | 36 | };
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nkeynes@1 | 37 |
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nkeynes@1 | 38 | struct cdi_track {
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nkeynes@1 | 39 | int file_posn;
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nkeynes@1 | 40 | int length; /* bytes */
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nkeynes@1 | 41 | int pregap; /* sectors */
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nkeynes@1 | 42 | int mode;
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nkeynes@1 | 43 | int sector_size;
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nkeynes@1 | 44 | int session;
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nkeynes@1 | 45 | struct cdi_track *next;
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nkeynes@1 | 46 | };
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nkeynes@1 | 47 |
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nkeynes@1 | 48 | struct cdi_handle {
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nkeynes@1 | 49 | int fd;
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nkeynes@1 | 50 | uint16_t num_sessions;
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nkeynes@1 | 51 | struct cdi_track *tracks;
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nkeynes@1 | 52 | };
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nkeynes@1 | 53 |
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nkeynes@1 | 54 |
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nkeynes@1 | 55 |
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nkeynes@1 | 56 | struct cdi_track_data {
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nkeynes@1 | 57 | char unknown[0x19];
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nkeynes@1 | 58 | uint32_t pregap_length;
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nkeynes@1 | 59 | uint32_t length;
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nkeynes@1 | 60 | char unknown2[6];
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nkeynes@1 | 61 | uint32_t mode;
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nkeynes@1 | 62 | char unknown3[0x0c];
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nkeynes@1 | 63 | uint32_t start_lba;
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nkeynes@1 | 64 | uint32_t total_length;
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nkeynes@1 | 65 | char unknown4[0x10];
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nkeynes@1 | 66 | uint32_t sector_size;
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nkeynes@1 | 67 | char unknown5[0x1D];
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nkeynes@1 | 68 | } __attribute__((packed));
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nkeynes@1 | 69 |
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nkeynes@1 | 70 | cdi_t cdi_open( char *filename )
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nkeynes@1 | 71 | {
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nkeynes@1 | 72 | #define BAIL( x, ... ) { fprintf( stderr, x, __VA_ARGS__ ); if( fd != -1 ) close(fd); return NULL; }
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nkeynes@1 | 73 |
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nkeynes@1 | 74 | struct stat st;
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nkeynes@1 | 75 | int fd = -1, i,j, tmp;
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nkeynes@1 | 76 | int posn = 0, hdr;
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nkeynes@1 | 77 | long len;
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nkeynes@1 | 78 | struct cdi_trailer trail;
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nkeynes@1 | 79 | struct cdi_handle cdi;
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nkeynes@1 | 80 | uint16_t tracks;
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nkeynes@1 | 81 | uint32_t new_fmt;
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nkeynes@1 | 82 | char tmpc;
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nkeynes@1 | 83 | char marker[20];
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nkeynes@1 | 84 |
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nkeynes@1 | 85 | fd = open( filename, O_RDONLY );
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nkeynes@1 | 86 | if( fd == -1 )
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nkeynes@1 | 87 | BAIL( "Unable to open file: %s (%s)\n", filename, strerror(errno) );
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nkeynes@1 | 88 | fstat( fd, &st );
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nkeynes@1 | 89 | if( st.st_size < 8 )
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nkeynes@1 | 90 | BAIL( "File is too small to be a valid CDI image: %s\n", filename );
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nkeynes@1 | 91 | len = lseek( fd, -8, SEEK_END );
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nkeynes@1 | 92 | read( fd, &trail, sizeof(trail) );
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nkeynes@1 | 93 | if( trail.header_offset > st.st_size ||
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nkeynes@1 | 94 | trail.header_offset == 0 )
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nkeynes@1 | 95 | BAIL( "Not a valid CDI image: %s\n", filename );
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nkeynes@1 | 96 |
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nkeynes@1 | 97 | if( trail.cdi_version == CDI_V2 ) trail.cdi_version = 2;
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nkeynes@1 | 98 | else if( trail.cdi_version == CDI_V3 ) trail.cdi_version = 3;
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nkeynes@1 | 99 | else BAIL( "Unknown CDI version code %08x in %s\n", trail.cdi_version,
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nkeynes@1 | 100 | filename );
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nkeynes@1 | 101 |
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nkeynes@1 | 102 | lseek( fd, trail.header_offset, SEEK_SET );
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nkeynes@1 | 103 | read( fd, &cdi.num_sessions, 2 );
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nkeynes@1 | 104 |
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nkeynes@1 | 105 |
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nkeynes@1 | 106 | printf( "CDI version: %d\n", trail.cdi_version );
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nkeynes@1 | 107 | printf( "Sessions: %d\n\n", cdi.num_sessions );
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nkeynes@1 | 108 | for( i=0; i< cdi.num_sessions; i++ ) {
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nkeynes@1 | 109 | read( fd, &tracks, 2 );
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nkeynes@1 | 110 | printf( "Session %d - %d tracks:\n", i+1, tracks );
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nkeynes@1 | 111 | for( j=0; j<tracks; j++ ) {
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nkeynes@1 | 112 | struct cdi_track_data trk;
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nkeynes@1 | 113 |
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nkeynes@1 | 114 | read( fd, &new_fmt, 4 );
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nkeynes@1 | 115 | if( new_fmt != 0 ) { /* Additional data 3.00.780+ ?? */
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nkeynes@1 | 116 | printf( "Note: CDI image has 3.00.780+ flag set\n" );
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nkeynes@1 | 117 | lseek( fd, 8, SEEK_CUR );
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nkeynes@1 | 118 | }
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nkeynes@1 | 119 | read( fd, marker, 20 );
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nkeynes@1 | 120 | if( memcmp( marker, track_start_marker, 20) != 0 )
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nkeynes@1 | 121 | BAIL( "Track start marker not found, error reading cdi\n",NULL );
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nkeynes@1 | 122 | read( fd, &tmp, 4 );
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nkeynes@1 | 123 | printf( "Unknown 4 bytes: %08x\n", tmp );
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nkeynes@1 | 124 | read( fd, &tmpc, 1 );
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nkeynes@1 | 125 | lseek( fd, (int)tmpc, SEEK_CUR ); /* skip over the filename */
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nkeynes@1 | 126 | read( fd, &trk, sizeof(trk) );
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nkeynes@1 | 127 | switch( trk.sector_size ) {
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nkeynes@1 | 128 | case 0: trk.sector_size = 2048; hdr=0; break;
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nkeynes@1 | 129 | case 1: trk.sector_size = 2336; hdr=8; break;
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nkeynes@1 | 130 | case 2:
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nkeynes@1 | 131 | trk.sector_size = 2352;
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nkeynes@1 | 132 | if( trk.mode == 2 ) hdr=24;
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nkeynes@1 | 133 | else hdr=16;
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nkeynes@1 | 134 | break;
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nkeynes@1 | 135 | default: BAIL( "Unknown sector size: %d\n", trk.sector_size );
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nkeynes@1 | 136 | }
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nkeynes@1 | 137 | posn += hdr;
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nkeynes@1 | 138 | len = trk.length*trk.sector_size;
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nkeynes@1 | 139 | printf( " Track %d\n", j+1 );
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nkeynes@1 | 140 | printf( " Pregap: %08x\n", trk.pregap_length );
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nkeynes@1 | 141 | printf( " Length: %08x\n", trk.length );
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nkeynes@1 | 142 | printf( " Mode: %d\n", trk.mode );
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nkeynes@1 | 143 | printf( " Sector size: %d\n", trk.sector_size );
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nkeynes@1 | 144 | printf( " Start LBA: %08x\n", trk.start_lba );
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nkeynes@1 | 145 | printf( " Total length: %08x\n", trk.total_length );
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nkeynes@1 | 146 | printf( " ---\n" );
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nkeynes@1 | 147 | printf( " File position: %08x\n", posn+trk.pregap_length*trk.sector_size );
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nkeynes@1 | 148 | printf( " File length: %d\n", len );
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nkeynes@1 | 149 | posn += trk.total_length*trk.sector_size;
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nkeynes@1 | 150 | lseek( fd, 12, SEEK_CUR );
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nkeynes@1 | 151 | if( new_fmt )
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nkeynes@1 | 152 | lseek( fd, 78, SEEK_CUR );
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nkeynes@1 | 153 | tmp = lseek( fd, 0, SEEK_CUR );
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nkeynes@1 | 154 | printf( "(Header offset: %x)\n", tmp - trail.header_offset );
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nkeynes@1 | 155 | }
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nkeynes@1 | 156 | }
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nkeynes@1 | 157 |
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nkeynes@1 | 158 | return NULL;
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nkeynes@1 | 159 | #undef BAIL(x, ...)
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nkeynes@1 | 160 | }
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nkeynes@1 | 161 |
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nkeynes@1 | 162 | int main(int argc, char *argv[] )
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nkeynes@1 | 163 | {
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nkeynes@1 | 164 | int i;
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nkeynes@1 | 165 |
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nkeynes@1 | 166 | for( i=1; i<argc; i++ ) {
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nkeynes@1 | 167 | cdi_open(argv[i]);
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nkeynes@1 | 168 | }
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nkeynes@1 | 169 | return 0;
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nkeynes@1 | 170 | }
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nkeynes@1 | 171 |
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