nkeynes@138 | 1 | /**
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nkeynes@158 | 2 | * $Id: gdrom.c,v 1.7 2006-06-15 10:32:42 nkeynes Exp $
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nkeynes@138 | 3 | *
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nkeynes@138 | 4 | * GD-Rom access functions.
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nkeynes@138 | 5 | *
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nkeynes@138 | 6 | * Copyright (c) 2005 Nathan Keynes.
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nkeynes@138 | 7 | *
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nkeynes@138 | 8 | * This program is free software; you can redistribute it and/or modify
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nkeynes@138 | 9 | * it under the terms of the GNU General Public License as published by
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nkeynes@138 | 10 | * the Free Software Foundation; either version 2 of the License, or
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nkeynes@138 | 11 | * (at your option) any later version.
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nkeynes@138 | 12 | *
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nkeynes@138 | 13 | * This program is distributed in the hope that it will be useful,
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nkeynes@138 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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nkeynes@138 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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nkeynes@138 | 16 | * GNU General Public License for more details.
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nkeynes@138 | 17 | */
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nkeynes@138 | 18 |
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nkeynes@138 | 19 | #include <stdio.h>
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nkeynes@138 | 20 |
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nkeynes@138 | 21 | #include "gdrom/ide.h"
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nkeynes@138 | 22 | #include "gdrom/gdrom.h"
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nkeynes@143 | 23 | #include "gdrom/packet.h"
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nkeynes@138 | 24 | #include "dream.h"
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nkeynes@138 | 25 |
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nkeynes@138 | 26 | static void gdrom_image_destroy( gdrom_disc_t );
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nkeynes@152 | 27 | static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t, uint32_t, uint32_t, int, char *, uint32_t * );
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nkeynes@138 | 28 |
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nkeynes@138 | 29 |
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nkeynes@138 | 30 | gdrom_disc_t gdrom_disc = NULL;
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nkeynes@138 | 31 |
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nkeynes@138 | 32 | char *gdrom_mode_names[] = { "Mode1", "Mode2", "XA 1", "XA2", "Audio", "GD-Rom" };
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nkeynes@138 | 33 | uint32_t gdrom_sector_size[] = { 2048, 2336, 2048, 2324, 2352, 2336 };
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nkeynes@138 | 34 |
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nkeynes@138 | 35 | gdrom_disc_t gdrom_image_open( const gchar *filename )
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nkeynes@138 | 36 | {
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nkeynes@138 | 37 | return nrg_image_open( filename );
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nkeynes@138 | 38 | }
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nkeynes@138 | 39 |
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nkeynes@138 | 40 |
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nkeynes@138 | 41 | gdrom_disc_t gdrom_image_new( FILE *file )
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nkeynes@138 | 42 | {
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nkeynes@138 | 43 | struct gdrom_disc *disc = (struct gdrom_disc *)calloc(1, sizeof(struct gdrom_disc));
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nkeynes@138 | 44 | if( disc == NULL )
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nkeynes@138 | 45 | return NULL;
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nkeynes@138 | 46 | disc->read_sectors = gdrom_image_read_sectors;
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nkeynes@138 | 47 | disc->close = gdrom_image_destroy;
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nkeynes@138 | 48 | disc->disc_type = IDE_DISC_CDROM;
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nkeynes@138 | 49 | disc->file = file;
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nkeynes@138 | 50 | return disc;
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nkeynes@138 | 51 | }
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nkeynes@138 | 52 |
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nkeynes@138 | 53 | static void gdrom_image_destroy( gdrom_disc_t disc )
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nkeynes@138 | 54 | {
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nkeynes@138 | 55 | if( disc->file != NULL ) {
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nkeynes@138 | 56 | fclose(disc->file);
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nkeynes@138 | 57 | disc->file = NULL;
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nkeynes@138 | 58 | }
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nkeynes@138 | 59 | free( disc );
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nkeynes@138 | 60 | }
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nkeynes@138 | 61 |
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nkeynes@152 | 62 | static gdrom_error_t gdrom_image_read_sectors( gdrom_disc_t disc, uint32_t sector,
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nkeynes@152 | 63 | uint32_t sector_count, int mode, char *buf,
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nkeynes@152 | 64 | uint32_t *length )
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nkeynes@138 | 65 | {
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nkeynes@152 | 66 | int i, file_offset, read_len;
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nkeynes@152 | 67 | struct gdrom_track *track = NULL;
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nkeynes@138 | 68 |
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nkeynes@138 | 69 | for( i=0; i<disc->track_count; i++ ) {
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nkeynes@138 | 70 | if( disc->track[i].lba <= sector &&
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nkeynes@142 | 71 | (sector + sector_count) <= (disc->track[i].lba + disc->track[i].sector_count) ) {
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nkeynes@152 | 72 | track = &disc->track[i];
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nkeynes@138 | 73 | break;
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nkeynes@138 | 74 | }
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nkeynes@138 | 75 | }
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nkeynes@152 | 76 | if( track == NULL )
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nkeynes@143 | 77 | return PKT_ERR_BADREAD;
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nkeynes@152 | 78 |
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nkeynes@152 | 79 | file_offset = track->offset + track->sector_size * (sector - track->lba);
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nkeynes@152 | 80 | read_len = track->sector_size * sector_count;
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nkeynes@152 | 81 |
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nkeynes@152 | 82 | switch( mode ) {
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nkeynes@152 | 83 | case GDROM_GD:
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nkeynes@158 | 84 | // Temporarily comment this out - it's wrong, but...
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nkeynes@158 | 85 | // if( track->mode != GDROM_GD )
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nkeynes@158 | 86 | // return PKT_ERR_BADREADMODE;
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nkeynes@158 | 87 | // break;
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nkeynes@152 | 88 | case GDROM_MODE1:
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nkeynes@152 | 89 | switch( track->mode ) {
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nkeynes@152 | 90 | case GDROM_MODE1:
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nkeynes@152 | 91 | case GDROM_MODE2_XA1:
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nkeynes@154 | 92 | fseek( disc->file, file_offset, SEEK_SET );
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nkeynes@152 | 93 | fread( buf, track->sector_size, sector_count, disc->file );
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nkeynes@152 | 94 | break;
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nkeynes@152 | 95 | case GDROM_MODE2:
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nkeynes@152 | 96 | read_len = sector_count * 2048;
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nkeynes@154 | 97 | file_offset += 8; /* skip the subheader */
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nkeynes@152 | 98 | while( sector_count > 0 ) {
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nkeynes@154 | 99 | fseek( disc->file, file_offset, SEEK_SET );
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nkeynes@152 | 100 | fread( buf, 2048, 1, disc->file );
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nkeynes@152 | 101 | file_offset += track->sector_size;
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nkeynes@152 | 102 | buf += 2048;
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nkeynes@152 | 103 | sector_count--;
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nkeynes@152 | 104 | }
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nkeynes@152 | 105 | break;
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nkeynes@152 | 106 | default:
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nkeynes@152 | 107 | return PKT_ERR_BADREADMODE;
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nkeynes@152 | 108 | }
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nkeynes@152 | 109 | break;
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nkeynes@152 | 110 | default:
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nkeynes@143 | 111 | return PKT_ERR_BADREADMODE;
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nkeynes@152 | 112 | }
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nkeynes@152 | 113 |
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nkeynes@143 | 114 | *length = read_len;
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nkeynes@143 | 115 | return PKT_ERR_OK;
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nkeynes@138 | 116 | }
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nkeynes@138 | 117 |
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nkeynes@138 | 118 | uint32_t gdrom_read_sectors( uint32_t sector, uint32_t sector_count,
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nkeynes@143 | 119 | int mode, char *buf, uint32_t *length )
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nkeynes@138 | 120 | {
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nkeynes@138 | 121 | if( gdrom_disc == NULL )
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nkeynes@143 | 122 | return PKT_ERR_NODISC; /* No media */
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nkeynes@143 | 123 | return gdrom_disc->read_sectors( gdrom_disc, sector, sector_count, mode, buf, length );
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nkeynes@138 | 124 | }
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nkeynes@138 | 125 |
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nkeynes@138 | 126 |
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nkeynes@138 | 127 | void gdrom_dump_disc( gdrom_disc_t disc ) {
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nkeynes@138 | 128 | int i;
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nkeynes@138 | 129 | INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count,
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nkeynes@138 | 130 | disc->track[disc->track_count-1].session + 1 );
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nkeynes@138 | 131 | for( i=0; i<disc->track_count; i++ ) {
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nkeynes@138 | 132 | INFO( "Sess %d Trk %d: Start %06X Length %06X, %s",
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nkeynes@138 | 133 | disc->track[i].session+1, i+1, disc->track[i].lba,
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nkeynes@138 | 134 | disc->track[i].sector_count, gdrom_mode_names[disc->track[i].mode] );
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nkeynes@138 | 135 | }
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nkeynes@138 | 136 | }
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nkeynes@138 | 137 |
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nkeynes@149 | 138 | gdrom_error_t gdrom_get_toc( char *buf )
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nkeynes@138 | 139 | {
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nkeynes@142 | 140 | struct gdrom_toc *toc = (struct gdrom_toc *)buf;
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nkeynes@142 | 141 | int i;
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nkeynes@142 | 142 |
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nkeynes@138 | 143 | if( gdrom_disc == NULL )
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nkeynes@149 | 144 | return PKT_ERR_NODISC;
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nkeynes@142 | 145 |
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nkeynes@142 | 146 | for( i=0; i<gdrom_disc->track_count; i++ ) {
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nkeynes@142 | 147 | toc->track[i] = htonl( gdrom_disc->track[i].lba ) | gdrom_disc->track[i].flags;
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nkeynes@142 | 148 | }
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nkeynes@142 | 149 | toc->first = 0x0100 | gdrom_disc->track[0].flags;
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nkeynes@142 | 150 | toc->last = (gdrom_disc->track_count<<8) | gdrom_disc->track[i-1].flags;
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nkeynes@142 | 151 | toc->leadout = htonl(gdrom_disc->track[i-1].lba + gdrom_disc->track[i-1].sector_count) |
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nkeynes@142 | 152 | gdrom_disc->track[i-1].flags;
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nkeynes@142 | 153 | for( ;i<99; i++ )
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nkeynes@142 | 154 | toc->track[i] = 0xFFFFFFFF;
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nkeynes@149 | 155 | return PKT_ERR_OK;
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nkeynes@149 | 156 | }
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nkeynes@149 | 157 |
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nkeynes@152 | 158 | gdrom_error_t gdrom_get_info( char *buf, int session )
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nkeynes@149 | 159 | {
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nkeynes@149 | 160 | if( gdrom_disc == NULL )
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nkeynes@149 | 161 | return PKT_ERR_NODISC;
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nkeynes@149 | 162 | struct gdrom_track *last_track = &gdrom_disc->track[gdrom_disc->track_count-1];
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nkeynes@149 | 163 | unsigned int end_of_disc = last_track->lba + last_track->sector_count;
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nkeynes@152 | 164 | int i;
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nkeynes@152 | 165 | buf[0] = 0x01; /* Disc status? */
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nkeynes@149 | 166 | buf[1] = 0;
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nkeynes@152 | 167 |
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nkeynes@152 | 168 | if( session == 0 ) {
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nkeynes@152 | 169 | buf[2] = last_track->session+1; /* last session */
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nkeynes@152 | 170 | buf[3] = (end_of_disc >> 16) & 0xFF;
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nkeynes@152 | 171 | buf[4] = (end_of_disc >> 8) & 0xFF;
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nkeynes@152 | 172 | buf[5] = end_of_disc & 0xFF;
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nkeynes@152 | 173 | return PKT_ERR_OK;
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nkeynes@152 | 174 | } else {
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nkeynes@152 | 175 | session--;
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nkeynes@152 | 176 | for( i=0; i<gdrom_disc->track_count; i++ ) {
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nkeynes@152 | 177 | if( gdrom_disc->track[i].session == session ) {
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nkeynes@152 | 178 | buf[2] = i+1; /* first track of session */
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nkeynes@152 | 179 | buf[3] = (gdrom_disc->track[i].lba >> 16) & 0xFF;
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nkeynes@152 | 180 | buf[4] = (gdrom_disc->track[i].lba >> 8) & 0xFF;
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nkeynes@152 | 181 | buf[5] = gdrom_disc->track[i].lba & 0xFF;
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nkeynes@152 | 182 | return PKT_ERR_OK;
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nkeynes@152 | 183 | }
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nkeynes@152 | 184 | }
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nkeynes@152 | 185 | return PKT_ERR_BADFIELD; /* No such session */
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nkeynes@152 | 186 | }
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nkeynes@152 | 187 |
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nkeynes@138 | 188 | }
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nkeynes@138 | 189 |
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nkeynes@138 | 190 | void gdrom_mount_disc( gdrom_disc_t disc )
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nkeynes@138 | 191 | {
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nkeynes@138 | 192 | gdrom_unmount_disc();
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nkeynes@138 | 193 | gdrom_disc = disc;
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nkeynes@138 | 194 | idereg.disc = disc->disc_type | IDE_DISC_READY;
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nkeynes@138 | 195 | gdrom_dump_disc( disc );
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nkeynes@138 | 196 | }
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nkeynes@138 | 197 |
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nkeynes@138 | 198 | gdrom_disc_t gdrom_mount_image( const gchar *filename )
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nkeynes@138 | 199 | {
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nkeynes@138 | 200 | gdrom_disc_t disc = gdrom_image_open(filename);
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nkeynes@138 | 201 | if( disc != NULL )
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nkeynes@138 | 202 | gdrom_mount_disc( disc );
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nkeynes@138 | 203 | return disc;
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nkeynes@138 | 204 | }
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nkeynes@138 | 205 |
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nkeynes@138 | 206 | void gdrom_unmount_disc( )
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nkeynes@138 | 207 | {
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nkeynes@138 | 208 | if( gdrom_disc != NULL ) {
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nkeynes@138 | 209 | gdrom_disc->close(gdrom_disc);
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nkeynes@138 | 210 | }
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nkeynes@138 | 211 | gdrom_disc = NULL;
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nkeynes@138 | 212 | idereg.disc = IDE_DISC_NONE;
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nkeynes@138 | 213 | }
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nkeynes@138 | 214 |
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nkeynes@138 | 215 | gboolean gdrom_is_mounted( void )
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nkeynes@138 | 216 | {
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nkeynes@138 | 217 | return gdrom_disc != NULL;
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nkeynes@138 | 218 | }
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