nkeynes@342 | 1 | /**
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nkeynes@498 | 2 | * $Id: gdimage.c,v 1.7 2007-11-08 10:48:41 nkeynes Exp $
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nkeynes@342 | 3 | *
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nkeynes@342 | 4 | * GD-Rom image-file common functions.
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nkeynes@342 | 5 | *
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nkeynes@342 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@342 | 7 | *
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nkeynes@342 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@342 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@342 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@342 | 11 | * (at your option) any later version.
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nkeynes@342 | 12 | *
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nkeynes@342 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@342 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@342 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@342 | 16 | * GNU General Public License for more details.
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nkeynes@342 | 17 | */
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nkeynes@342 | 18 |
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nkeynes@422 | 19 | #include <netinet/in.h>
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nkeynes@422 | 20 |
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nkeynes@342 | 21 | #include "gdrom/gdrom.h"
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nkeynes@342 | 22 | #include "gdrom/packet.h"
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nkeynes@422 | 23 | #include "bootstrap.h"
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nkeynes@342 | 24 |
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nkeynes@342 | 25 | static void gdrom_image_destroy( gdrom_disc_t disc );
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nkeynes@342 | 26 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode,
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nkeynes@422 | 27 | unsigned char *buf, uint32_t *readlength );
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nkeynes@422 | 28 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
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nkeynes@422 | 29 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
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nkeynes@422 | 30 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
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nkeynes@342 | 31 | static int gdrom_image_drive_status( gdrom_disc_t disc );
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nkeynes@342 | 32 |
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nkeynes@498 | 33 | struct cdrom_sector_header {
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nkeynes@498 | 34 | uint8_t sync[12];
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nkeynes@498 | 35 | uint8_t msf[3];
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nkeynes@498 | 36 | uint8_t mode;
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nkeynes@498 | 37 | };
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nkeynes@342 | 38 |
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nkeynes@342 | 39 | /**
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nkeynes@342 | 40 | * Initialize a gdrom_disc structure with the gdrom_image_* methods
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nkeynes@342 | 41 | */
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nkeynes@342 | 42 | void gdrom_image_init( gdrom_disc_t disc )
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nkeynes@342 | 43 | {
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nkeynes@342 | 44 | memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
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nkeynes@342 | 45 | disc->read_sector = gdrom_image_read_sector;
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nkeynes@342 | 46 | disc->read_toc = gdrom_image_read_toc;
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nkeynes@342 | 47 | disc->read_session = gdrom_image_read_session;
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nkeynes@342 | 48 | disc->read_position = gdrom_image_read_position;
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nkeynes@342 | 49 | disc->drive_status = gdrom_image_drive_status;
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nkeynes@342 | 50 | disc->play_audio = NULL; /* not supported yet */
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nkeynes@342 | 51 | disc->run_time_slice = NULL; /* not needed */
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nkeynes@342 | 52 | disc->close = gdrom_image_destroy;
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nkeynes@342 | 53 | }
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nkeynes@342 | 54 |
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nkeynes@464 | 55 | gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
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nkeynes@342 | 56 | {
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nkeynes@342 | 57 | gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1);
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nkeynes@342 | 58 | if( image == NULL ) {
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nkeynes@342 | 59 | return NULL;
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nkeynes@342 | 60 | }
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nkeynes@342 | 61 | image->disc_type = IDE_DISC_CDROM;
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nkeynes@342 | 62 | image->file = f;
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nkeynes@342 | 63 | gdrom_disc_t disc = (gdrom_disc_t)image;
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nkeynes@342 | 64 | gdrom_image_init(disc);
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nkeynes@464 | 65 | if( filename == NULL ) {
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nkeynes@464 | 66 | disc->name = NULL;
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nkeynes@464 | 67 | } else {
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nkeynes@464 | 68 | disc->name = g_strdup(filename);
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nkeynes@464 | 69 | }
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nkeynes@464 | 70 |
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nkeynes@342 | 71 | return disc;
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nkeynes@342 | 72 | }
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nkeynes@342 | 73 |
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nkeynes@342 | 74 | static void gdrom_image_destroy( gdrom_disc_t disc )
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nkeynes@342 | 75 | {
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nkeynes@492 | 76 | int i;
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nkeynes@492 | 77 | FILE *lastfile = NULL;
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nkeynes@342 | 78 | gdrom_image_t img = (gdrom_image_t)disc;
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nkeynes@342 | 79 | if( img->file != NULL ) {
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nkeynes@342 | 80 | fclose(img->file);
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nkeynes@342 | 81 | img->file = NULL;
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nkeynes@342 | 82 | }
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nkeynes@492 | 83 | for( i=0; i<img->track_count; i++ ) {
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nkeynes@492 | 84 | if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
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nkeynes@492 | 85 | lastfile = img->track[i].file;
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nkeynes@492 | 86 | fclose(lastfile);
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nkeynes@492 | 87 | img->track[i].file = NULL;
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nkeynes@492 | 88 | }
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nkeynes@492 | 89 | }
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nkeynes@464 | 90 | if( disc->name != NULL ) {
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nkeynes@480 | 91 | g_free( (gpointer)disc->name );
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nkeynes@464 | 92 | disc->name = NULL;
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nkeynes@464 | 93 | }
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nkeynes@342 | 94 | free( disc );
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nkeynes@342 | 95 | }
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nkeynes@342 | 96 |
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nkeynes@468 | 97 | void gdrom_image_destroy_no_close( gdrom_disc_t disc )
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nkeynes@468 | 98 | {
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nkeynes@492 | 99 | int i;
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nkeynes@492 | 100 | FILE *lastfile = NULL;
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nkeynes@468 | 101 | gdrom_image_t img = (gdrom_image_t)disc;
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nkeynes@468 | 102 | if( img->file != NULL ) {
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nkeynes@468 | 103 | img->file = NULL;
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nkeynes@468 | 104 | }
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nkeynes@492 | 105 | for( i=0; i<img->track_count; i++ ) {
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nkeynes@492 | 106 | if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
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nkeynes@492 | 107 | lastfile = img->track[i].file;
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nkeynes@492 | 108 | fclose(lastfile);
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nkeynes@492 | 109 | img->track[i].file = NULL;
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nkeynes@492 | 110 | }
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nkeynes@492 | 111 | }
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nkeynes@468 | 112 | if( disc->name != NULL ) {
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nkeynes@480 | 113 | g_free( (gpointer)disc->name );
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nkeynes@468 | 114 | disc->name = NULL;
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nkeynes@468 | 115 | }
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nkeynes@468 | 116 | free( disc );
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nkeynes@468 | 117 | }
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nkeynes@468 | 118 |
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nkeynes@342 | 119 | static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
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nkeynes@342 | 120 | {
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nkeynes@342 | 121 | int i;
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nkeynes@342 | 122 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@342 | 123 | if( image->track[i].lba <= lba &&
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nkeynes@342 | 124 | lba < (image->track[i].lba + image->track[i].sector_count) ) {
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nkeynes@342 | 125 | return i+1;
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nkeynes@342 | 126 | }
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nkeynes@342 | 127 | }
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nkeynes@342 | 128 | return -1;
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nkeynes@342 | 129 | }
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nkeynes@342 | 130 |
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nkeynes@492 | 131 | /**
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nkeynes@492 | 132 | * Read a block from an image file, handling negative file offsets
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nkeynes@492 | 133 | * with 0-fill.
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nkeynes@492 | 134 | */
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nkeynes@498 | 135 | static void gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
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nkeynes@492 | 136 | {
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nkeynes@492 | 137 | if( file_offset < 0 ) {
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nkeynes@492 | 138 | int size = -file_offset;
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nkeynes@492 | 139 | if( size >= length ) {
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nkeynes@492 | 140 | memset( buf, 0, length );
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nkeynes@492 | 141 | return;
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nkeynes@492 | 142 | } else {
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nkeynes@492 | 143 | memset( buf, 0, size );
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nkeynes@492 | 144 | file_offset = 0;
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nkeynes@492 | 145 | length -= size;
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nkeynes@492 | 146 | }
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nkeynes@492 | 147 | }
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nkeynes@492 | 148 | fseek( f, file_offset, SEEK_SET );
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nkeynes@492 | 149 | fread( buf, length, 1, f );
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nkeynes@492 | 150 | }
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nkeynes@492 | 151 |
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nkeynes@342 | 152 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
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nkeynes@422 | 153 | int mode, unsigned char *buf, uint32_t *length )
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nkeynes@342 | 154 | {
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nkeynes@342 | 155 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@498 | 156 | struct cdrom_sector_header secthead;
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nkeynes@422 | 157 | int file_offset, read_len, track_no;
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nkeynes@498 | 158 |
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nkeynes@492 | 159 | FILE *f;
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nkeynes@342 | 160 |
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nkeynes@342 | 161 | track_no = gdrom_image_get_track_by_lba( image, lba );
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nkeynes@342 | 162 | if( track_no == -1 ) {
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nkeynes@342 | 163 | return PKT_ERR_BADREAD;
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nkeynes@342 | 164 | }
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nkeynes@342 | 165 | struct gdrom_track *track = &image->track[track_no-1];
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nkeynes@342 | 166 | file_offset = track->offset + track->sector_size * (lba - track->lba);
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nkeynes@342 | 167 | read_len = track->sector_size;
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nkeynes@492 | 168 | if( track->file != NULL ) {
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nkeynes@492 | 169 | f = track->file;
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nkeynes@492 | 170 | } else {
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nkeynes@492 | 171 | f = image->file;
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nkeynes@492 | 172 | }
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nkeynes@492 | 173 |
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nkeynes@492 | 174 |
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nkeynes@342 | 175 |
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nkeynes@342 | 176 | switch( mode ) {
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nkeynes@342 | 177 | case 0x24:
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nkeynes@342 | 178 | case 0x28:
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nkeynes@498 | 179 | read_len = 2048;
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nkeynes@342 | 180 | switch( track->mode ) {
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nkeynes@342 | 181 | case GDROM_MODE1:
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nkeynes@342 | 182 | case GDROM_MODE2_XA1:
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nkeynes@492 | 183 | gdrom_read_block( buf, file_offset, track->sector_size, f );
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nkeynes@342 | 184 | break;
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nkeynes@342 | 185 | case GDROM_MODE2:
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nkeynes@342 | 186 | file_offset += 8; /* skip the subheader */
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nkeynes@492 | 187 | gdrom_read_block( buf, file_offset, 2048, f );
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nkeynes@342 | 188 | break;
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nkeynes@498 | 189 | case GDROM_RAW:
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nkeynes@498 | 190 | gdrom_read_block( (unsigned char *)(§head), file_offset, sizeof(secthead), f );
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nkeynes@498 | 191 | switch( secthead.mode ) {
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nkeynes@498 | 192 | case 1:
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nkeynes@498 | 193 | file_offset += 16;
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nkeynes@498 | 194 | break;
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nkeynes@498 | 195 | case 2:
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nkeynes@498 | 196 | file_offset += 24;
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nkeynes@498 | 197 | break;
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nkeynes@498 | 198 | default:
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nkeynes@498 | 199 | return PKT_ERR_BADREADMODE;
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nkeynes@498 | 200 | }
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nkeynes@498 | 201 | gdrom_read_block( buf, file_offset, 2048, f );
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nkeynes@498 | 202 | break;
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nkeynes@342 | 203 | default:
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nkeynes@342 | 204 | return PKT_ERR_BADREADMODE;
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nkeynes@342 | 205 | }
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nkeynes@342 | 206 | break;
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nkeynes@342 | 207 | default:
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nkeynes@342 | 208 | return PKT_ERR_BADREADMODE;
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nkeynes@342 | 209 | }
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nkeynes@342 | 210 |
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nkeynes@342 | 211 | *length = read_len;
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nkeynes@342 | 212 | return PKT_ERR_OK;
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nkeynes@342 | 213 |
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nkeynes@342 | 214 | }
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nkeynes@342 | 215 |
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nkeynes@422 | 216 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf )
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nkeynes@342 | 217 | {
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nkeynes@342 | 218 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 219 | struct gdrom_toc *toc = (struct gdrom_toc *)buf;
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nkeynes@342 | 220 | int i;
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nkeynes@342 | 221 |
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nkeynes@342 | 222 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@342 | 223 | toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
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nkeynes@342 | 224 | }
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nkeynes@342 | 225 | toc->first = 0x0100 | image->track[0].flags;
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nkeynes@342 | 226 | toc->last = (image->track_count<<8) | image->track[i-1].flags;
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nkeynes@342 | 227 | toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
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nkeynes@342 | 228 | image->track[i-1].flags;
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nkeynes@342 | 229 | for( ;i<99; i++ )
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nkeynes@342 | 230 | toc->track[i] = 0xFFFFFFFF;
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nkeynes@342 | 231 | return PKT_ERR_OK;
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nkeynes@342 | 232 | }
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nkeynes@342 | 233 |
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nkeynes@422 | 234 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
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nkeynes@342 | 235 | {
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nkeynes@342 | 236 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 237 | struct gdrom_track *last_track = &image->track[image->track_count-1];
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nkeynes@342 | 238 | unsigned int end_of_disc = last_track->lba + last_track->sector_count;
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nkeynes@342 | 239 | int i;
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nkeynes@342 | 240 | buf[0] = 0x01; /* Disc status? */
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nkeynes@342 | 241 | buf[1] = 0;
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nkeynes@342 | 242 |
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nkeynes@342 | 243 | if( session == 0 ) {
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nkeynes@342 | 244 | buf[2] = last_track->session+1; /* last session */
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nkeynes@342 | 245 | buf[3] = (end_of_disc >> 16) & 0xFF;
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nkeynes@342 | 246 | buf[4] = (end_of_disc >> 8) & 0xFF;
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nkeynes@342 | 247 | buf[5] = end_of_disc & 0xFF;
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nkeynes@342 | 248 | return PKT_ERR_OK;
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nkeynes@342 | 249 | } else {
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nkeynes@342 | 250 | session--;
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nkeynes@342 | 251 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@342 | 252 | if( image->track[i].session == session ) {
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nkeynes@342 | 253 | buf[2] = i+1; /* first track of session */
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nkeynes@342 | 254 | buf[3] = (image->track[i].lba >> 16) & 0xFF;
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nkeynes@342 | 255 | buf[4] = (image->track[i].lba >> 8) & 0xFF;
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nkeynes@342 | 256 | buf[5] = image->track[i].lba & 0xFF;
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nkeynes@342 | 257 | return PKT_ERR_OK;
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nkeynes@342 | 258 | }
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nkeynes@342 | 259 | }
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nkeynes@342 | 260 | return PKT_ERR_BADFIELD; /* No such session */
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nkeynes@342 | 261 | }
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nkeynes@342 | 262 | }
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nkeynes@342 | 263 |
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nkeynes@422 | 264 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
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nkeynes@342 | 265 | {
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nkeynes@342 | 266 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 267 | int track_no = gdrom_image_get_track_by_lba( image, lba );
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nkeynes@342 | 268 | if( track_no == -1 ) {
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nkeynes@342 | 269 | track_no = 1;
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nkeynes@342 | 270 | lba = 150;
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nkeynes@342 | 271 | }
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nkeynes@342 | 272 | struct gdrom_track *track = &image->track[track_no-1];
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nkeynes@342 | 273 | uint32_t offset = lba - track->lba;
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nkeynes@342 | 274 | buf[4] = track->flags;
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nkeynes@342 | 275 | buf[5] = track_no;
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nkeynes@342 | 276 | buf[6] = 0x01; /* ?? */
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nkeynes@342 | 277 | buf[7] = (offset >> 16) & 0xFF;
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nkeynes@342 | 278 | buf[8] = (offset >> 8) & 0xFF;
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nkeynes@342 | 279 | buf[9] = offset & 0xFF;
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nkeynes@342 | 280 | buf[10] = 0;
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nkeynes@342 | 281 | buf[11] = (lba >> 16) & 0xFF;
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nkeynes@342 | 282 | buf[12] = (lba >> 8) & 0xFF;
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nkeynes@342 | 283 | buf[13] = lba & 0xFF;
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nkeynes@422 | 284 | return PKT_ERR_OK;
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nkeynes@342 | 285 | }
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nkeynes@342 | 286 |
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nkeynes@342 | 287 | static int gdrom_image_drive_status( gdrom_disc_t disc )
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nkeynes@342 | 288 | {
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nkeynes@342 | 289 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 290 | return image->disc_type | IDE_DISC_READY;
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nkeynes@342 | 291 | }
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nkeynes@342 | 292 |
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nkeynes@342 | 293 | void gdrom_image_dump_info( gdrom_disc_t d ) {
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nkeynes@342 | 294 | gdrom_image_t disc = (gdrom_image_t)d;
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nkeynes@342 | 295 | int i;
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nkeynes@342 | 296 | int last_session = disc->track[disc->track_count-1].session;
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nkeynes@342 | 297 | gboolean is_bootable = FALSE;
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nkeynes@342 | 298 |
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nkeynes@342 | 299 | INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
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nkeynes@342 | 300 | disc->track[disc->track_count-1].session + 1 );
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nkeynes@342 | 301 | if( last_session > 0 ) {
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nkeynes@342 | 302 | /* Boot track is the first data track of the last session, provided that it
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nkeynes@342 | 303 | * cannot be a single-session disc.
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nkeynes@342 | 304 | */
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nkeynes@342 | 305 | int boot_track = -1;
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nkeynes@342 | 306 | for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
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nkeynes@342 | 307 | if( disc->track[i].flags & TRACK_DATA ) {
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nkeynes@342 | 308 | boot_track = i;
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nkeynes@342 | 309 | }
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nkeynes@342 | 310 | }
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nkeynes@342 | 311 | if( boot_track != -1 ) {
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nkeynes@422 | 312 | unsigned char boot_sector[MAX_SECTOR_SIZE];
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nkeynes@342 | 313 | uint32_t length = sizeof(boot_sector);
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nkeynes@342 | 314 | if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
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nkeynes@342 | 315 | boot_sector, &length ) == PKT_ERR_OK ) {
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nkeynes@342 | 316 | bootstrap_dump(boot_sector, FALSE);
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nkeynes@342 | 317 | is_bootable = TRUE;
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nkeynes@342 | 318 | }
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nkeynes@342 | 319 | }
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nkeynes@342 | 320 | }
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nkeynes@342 | 321 | if( !is_bootable ) {
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nkeynes@342 | 322 | WARN( "Disc does not appear to be bootable" );
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nkeynes@342 | 323 | }
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nkeynes@342 | 324 | }
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nkeynes@342 | 325 |
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