nkeynes@342 | 1 | /**
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nkeynes@561 | 2 | * $Id$
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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@644 | 19 | #include <assert.h>
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nkeynes@759 | 20 | #include <stdlib.h>
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nkeynes@736 | 21 | #include <string.h>
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nkeynes@840 | 22 | #include <ctype.h>
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nkeynes@796 | 23 | #include <sys/types.h>
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nkeynes@422 | 24 | #include <netinet/in.h>
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nkeynes@422 | 25 |
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nkeynes@678 | 26 | #include "gdrom/gddriver.h"
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nkeynes@342 | 27 | #include "gdrom/packet.h"
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nkeynes@644 | 28 | #include "ecc.h"
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nkeynes@422 | 29 | #include "bootstrap.h"
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nkeynes@342 | 30 |
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nkeynes@342 | 31 | static void gdrom_image_destroy( gdrom_disc_t disc );
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nkeynes@342 | 32 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode,
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nkeynes@736 | 33 | unsigned char *buf, uint32_t *readlength );
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nkeynes@422 | 34 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf );
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nkeynes@422 | 35 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf );
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nkeynes@422 | 36 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf );
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nkeynes@342 | 37 | static int gdrom_image_drive_status( gdrom_disc_t disc );
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nkeynes@342 | 38 |
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nkeynes@644 | 39 | static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 };
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nkeynes@644 | 40 |
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nkeynes@644 | 41 | #define SECTOR_HEADER_SIZE 16
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nkeynes@644 | 42 | #define SECTOR_SUBHEADER_SIZE 8
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nkeynes@644 | 43 |
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nkeynes@644 | 44 | /* Data offset (from start of raw sector) by sector mode */
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nkeynes@644 | 45 | static int gdrom_data_offset[] = { 16, 16, 16, 24, 24, 0, 8, 0, 0 };
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nkeynes@644 | 46 |
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nkeynes@644 | 47 |
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nkeynes@644 | 48 |
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nkeynes@498 | 49 | struct cdrom_sector_header {
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nkeynes@498 | 50 | uint8_t sync[12];
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nkeynes@498 | 51 | uint8_t msf[3];
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nkeynes@498 | 52 | uint8_t mode;
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nkeynes@644 | 53 | uint8_t subhead[8]; // Mode-2 XA sectors only
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nkeynes@498 | 54 | };
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nkeynes@342 | 55 |
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nkeynes@342 | 56 | /**
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nkeynes@342 | 57 | * Initialize a gdrom_disc structure with the gdrom_image_* methods
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nkeynes@342 | 58 | */
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nkeynes@342 | 59 | void gdrom_image_init( gdrom_disc_t disc )
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nkeynes@342 | 60 | {
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nkeynes@342 | 61 | memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */
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nkeynes@342 | 62 | disc->read_sector = gdrom_image_read_sector;
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nkeynes@342 | 63 | disc->read_toc = gdrom_image_read_toc;
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nkeynes@342 | 64 | disc->read_session = gdrom_image_read_session;
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nkeynes@342 | 65 | disc->read_position = gdrom_image_read_position;
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nkeynes@342 | 66 | disc->drive_status = gdrom_image_drive_status;
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nkeynes@342 | 67 | disc->play_audio = NULL; /* not supported yet */
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nkeynes@342 | 68 | disc->run_time_slice = NULL; /* not needed */
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nkeynes@342 | 69 | disc->close = gdrom_image_destroy;
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nkeynes@342 | 70 | }
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nkeynes@342 | 71 |
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nkeynes@464 | 72 | gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f )
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nkeynes@342 | 73 | {
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nkeynes@736 | 74 | gdrom_image_t image = (gdrom_image_t)g_malloc0(sizeof(struct gdrom_image));
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nkeynes@342 | 75 | if( image == NULL ) {
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nkeynes@736 | 76 | return NULL;
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nkeynes@342 | 77 | }
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nkeynes@644 | 78 | image->disc_type = IDE_DISC_CDROMXA;
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nkeynes@342 | 79 | image->file = f;
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nkeynes@342 | 80 | gdrom_disc_t disc = (gdrom_disc_t)image;
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nkeynes@342 | 81 | gdrom_image_init(disc);
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nkeynes@464 | 82 | if( filename == NULL ) {
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nkeynes@736 | 83 | disc->name = NULL;
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nkeynes@464 | 84 | } else {
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nkeynes@736 | 85 | disc->name = g_strdup(filename);
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nkeynes@464 | 86 | }
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nkeynes@464 | 87 |
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nkeynes@342 | 88 | return disc;
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nkeynes@342 | 89 | }
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nkeynes@342 | 90 |
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nkeynes@342 | 91 | static void gdrom_image_destroy( gdrom_disc_t disc )
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nkeynes@342 | 92 | {
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nkeynes@492 | 93 | int i;
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nkeynes@492 | 94 | FILE *lastfile = NULL;
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nkeynes@342 | 95 | gdrom_image_t img = (gdrom_image_t)disc;
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nkeynes@342 | 96 | if( img->file != NULL ) {
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nkeynes@736 | 97 | fclose(img->file);
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nkeynes@736 | 98 | img->file = NULL;
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nkeynes@342 | 99 | }
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nkeynes@492 | 100 | for( i=0; i<img->track_count; i++ ) {
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nkeynes@736 | 101 | if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
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nkeynes@736 | 102 | lastfile = img->track[i].file;
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nkeynes@736 | 103 | fclose(lastfile);
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nkeynes@736 | 104 | img->track[i].file = NULL;
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nkeynes@736 | 105 | }
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nkeynes@492 | 106 | }
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nkeynes@464 | 107 | if( disc->name != NULL ) {
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nkeynes@736 | 108 | g_free( (gpointer)disc->name );
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nkeynes@736 | 109 | disc->name = NULL;
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nkeynes@464 | 110 | }
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nkeynes@342 | 111 | free( disc );
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nkeynes@342 | 112 | }
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nkeynes@342 | 113 |
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nkeynes@468 | 114 | void gdrom_image_destroy_no_close( gdrom_disc_t disc )
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nkeynes@468 | 115 | {
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nkeynes@492 | 116 | int i;
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nkeynes@492 | 117 | FILE *lastfile = NULL;
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nkeynes@468 | 118 | gdrom_image_t img = (gdrom_image_t)disc;
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nkeynes@468 | 119 | if( img->file != NULL ) {
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nkeynes@736 | 120 | img->file = NULL;
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nkeynes@468 | 121 | }
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nkeynes@492 | 122 | for( i=0; i<img->track_count; i++ ) {
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nkeynes@736 | 123 | if( img->track[i].file != NULL && img->track[i].file != lastfile ) {
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nkeynes@736 | 124 | lastfile = img->track[i].file;
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nkeynes@736 | 125 | fclose(lastfile);
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nkeynes@736 | 126 | img->track[i].file = NULL;
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nkeynes@736 | 127 | }
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nkeynes@492 | 128 | }
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nkeynes@468 | 129 | if( disc->name != NULL ) {
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nkeynes@736 | 130 | g_free( (gpointer)disc->name );
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nkeynes@736 | 131 | disc->name = NULL;
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nkeynes@468 | 132 | }
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nkeynes@468 | 133 | free( disc );
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nkeynes@468 | 134 | }
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nkeynes@468 | 135 |
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nkeynes@782 | 136 | int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba )
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nkeynes@342 | 137 | {
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nkeynes@342 | 138 | int i;
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nkeynes@342 | 139 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@736 | 140 | if( image->track[i].lba <= lba &&
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nkeynes@736 | 141 | lba < (image->track[i].lba + image->track[i].sector_count) ) {
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nkeynes@736 | 142 | return i+1;
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nkeynes@736 | 143 | }
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nkeynes@342 | 144 | }
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nkeynes@342 | 145 | return -1;
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nkeynes@342 | 146 | }
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nkeynes@342 | 147 |
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nkeynes@492 | 148 | /**
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nkeynes@492 | 149 | * Read a block from an image file, handling negative file offsets
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nkeynes@492 | 150 | * with 0-fill.
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nkeynes@492 | 151 | */
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nkeynes@644 | 152 | static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f )
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nkeynes@492 | 153 | {
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nkeynes@492 | 154 | if( file_offset < 0 ) {
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nkeynes@736 | 155 | int size = -file_offset;
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nkeynes@736 | 156 | if( size >= length ) {
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nkeynes@736 | 157 | memset( buf, 0, length );
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nkeynes@736 | 158 | return TRUE;
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nkeynes@736 | 159 | } else {
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nkeynes@736 | 160 | memset( buf, 0, size );
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nkeynes@736 | 161 | file_offset = 0;
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nkeynes@736 | 162 | length -= size;
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nkeynes@736 | 163 | }
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nkeynes@492 | 164 | }
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nkeynes@492 | 165 | fseek( f, file_offset, SEEK_SET );
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nkeynes@644 | 166 | return fread( buf, length, 1, f ) == 1;
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nkeynes@492 | 167 | }
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nkeynes@492 | 168 |
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nkeynes@644 | 169 | static void gdrom_build_sector_header( unsigned char *buf, uint32_t lba,
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nkeynes@736 | 170 | gdrom_track_mode_t sector_mode )
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nkeynes@644 | 171 | {
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nkeynes@644 | 172 | memcpy( buf, gdrom_default_sync, 12 );
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nkeynes@644 | 173 | cd_build_address( buf, sector_mode, lba );
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nkeynes@644 | 174 | }
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nkeynes@644 | 175 |
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nkeynes@644 | 176 | /**
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nkeynes@644 | 177 | * Return TRUE if the given read mode + track modes are compatible,
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nkeynes@644 | 178 | * otherwise FALSE.
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nkeynes@644 | 179 | * @param track_mode one of the GDROM_MODE* constants
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nkeynes@644 | 180 | * @param read_mode the READ_CD_MODE from the read request
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nkeynes@644 | 181 | */
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nkeynes@644 | 182 | static gboolean gdrom_is_compatible_read_mode( int track_mode, int read_mode )
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nkeynes@644 | 183 | {
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nkeynes@644 | 184 | switch( read_mode ) {
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nkeynes@644 | 185 | case READ_CD_MODE_ANY:
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nkeynes@736 | 186 | return TRUE;
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nkeynes@644 | 187 | case READ_CD_MODE_CDDA:
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nkeynes@736 | 188 | return track_mode == GDROM_CDDA;
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nkeynes@644 | 189 | case READ_CD_MODE_1:
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nkeynes@736 | 190 | return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
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nkeynes@644 | 191 | case READ_CD_MODE_2_FORM_1:
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nkeynes@736 | 192 | return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1;
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nkeynes@644 | 193 | case READ_CD_MODE_2_FORM_2:
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nkeynes@736 | 194 | return track_mode == GDROM_MODE2_FORM2;
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nkeynes@644 | 195 | case READ_CD_MODE_2:
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nkeynes@736 | 196 | return track_mode == GDROM_MODE2_FORMLESS;
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nkeynes@644 | 197 | default:
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nkeynes@736 | 198 | return FALSE;
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nkeynes@644 | 199 | }
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nkeynes@644 | 200 | }
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nkeynes@644 | 201 |
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nkeynes@644 | 202 | /**
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nkeynes@644 | 203 | * Determine the start position in a raw sector, and the amount of data to read
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nkeynes@644 | 204 | * in bytes, for a given combination of sector mode and read mode.
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nkeynes@644 | 205 | */
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nkeynes@644 | 206 | static void gdrom_get_read_bounds( int sector_mode, int read_mode, int *start, int *size )
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nkeynes@644 | 207 | {
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nkeynes@644 | 208 | if( READ_CD_RAW(read_mode) ) {
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nkeynes@736 | 209 | // whole sector
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nkeynes@736 | 210 | *start = 0;
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nkeynes@736 | 211 | *size = 2352;
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nkeynes@644 | 212 | } else {
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nkeynes@736 | 213 | *size = 0;
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nkeynes@736 | 214 | if( READ_CD_DATA(read_mode) ) {
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nkeynes@736 | 215 | *start = gdrom_data_offset[sector_mode];
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nkeynes@736 | 216 | *size = gdrom_sector_size[sector_mode];
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nkeynes@736 | 217 | }
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nkeynes@644 | 218 |
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nkeynes@736 | 219 | if( READ_CD_SUBHEAD(read_mode) &&
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nkeynes@736 | 220 | (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
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nkeynes@736 | 221 | *start = SECTOR_HEADER_SIZE;
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nkeynes@736 | 222 | *size += SECTOR_SUBHEADER_SIZE;
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nkeynes@736 | 223 | }
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nkeynes@644 | 224 |
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nkeynes@736 | 225 | if( READ_CD_HEADER(read_mode) ) {
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nkeynes@736 | 226 | *size += SECTOR_HEADER_SIZE;
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nkeynes@736 | 227 | *start = 0;
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nkeynes@736 | 228 | }
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nkeynes@644 | 229 |
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nkeynes@644 | 230 | }
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nkeynes@644 | 231 | }
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nkeynes@644 | 232 |
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nkeynes@782 | 233 | void gdrom_extract_raw_data_sector( char *sector_data, int channels, unsigned char *buf, uint32_t *length )
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nkeynes@782 | 234 | {
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nkeynes@782 | 235 | int sector_mode;
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nkeynes@782 | 236 | int start, size;
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nkeynes@782 | 237 | struct cdrom_sector_header *secthead = (struct cdrom_sector_header *)sector_data;
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nkeynes@782 | 238 | if( secthead->mode == 1 ) {
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nkeynes@782 | 239 | sector_mode = GDROM_MODE1;
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nkeynes@782 | 240 | } else {
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nkeynes@782 | 241 | sector_mode = ((secthead->subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
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nkeynes@782 | 242 | }
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nkeynes@782 | 243 | gdrom_get_read_bounds( sector_mode, channels, &start, &size );
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nkeynes@782 | 244 |
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nkeynes@782 | 245 | memcpy( buf, sector_data+start, size );
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nkeynes@782 | 246 | *length = size;
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nkeynes@782 | 247 | }
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nkeynes@782 | 248 |
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nkeynes@644 | 249 | /**
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nkeynes@644 | 250 | * Read a single sector from a disc image. If you thought this would be simple,
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nkeynes@644 | 251 | * I have just one thing to say to you: Bwahahahahahahahah.
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nkeynes@644 | 252 | *
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nkeynes@644 | 253 | * Once we've decided that there's a real sector at the requested lba, there's
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nkeynes@644 | 254 | * really two things we need to care about:
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nkeynes@644 | 255 | * 1. Is the sector mode compatible with the requested read mode
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nkeynes@644 | 256 | * 2. Which parts of the sector do we need to return?
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nkeynes@644 | 257 | * (header/subhead/data/raw sector)
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nkeynes@644 | 258 | *
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nkeynes@644 | 259 | * Also note that the disc image may supply us with just the data (most common
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nkeynes@644 | 260 | * case), or may have the full raw sector. In the former case we may need to
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nkeynes@644 | 261 | * generate the missing data on the fly, for which we use libedc to compute the
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nkeynes@644 | 262 | * data correction codes.
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nkeynes@644 | 263 | */
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nkeynes@342 | 264 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba,
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nkeynes@736 | 265 | int mode, unsigned char *buf, uint32_t *length )
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nkeynes@342 | 266 | {
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nkeynes@342 | 267 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@498 | 268 | struct cdrom_sector_header secthead;
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nkeynes@422 | 269 | int file_offset, read_len, track_no;
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nkeynes@498 | 270 |
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nkeynes@492 | 271 | FILE *f;
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nkeynes@342 | 272 |
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nkeynes@342 | 273 | track_no = gdrom_image_get_track_by_lba( image, lba );
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nkeynes@342 | 274 | if( track_no == -1 ) {
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nkeynes@736 | 275 | return PKT_ERR_BADREAD;
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nkeynes@342 | 276 | }
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nkeynes@342 | 277 | struct gdrom_track *track = &image->track[track_no-1];
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nkeynes@342 | 278 | file_offset = track->offset + track->sector_size * (lba - track->lba);
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nkeynes@342 | 279 | read_len = track->sector_size;
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nkeynes@492 | 280 | if( track->file != NULL ) {
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nkeynes@736 | 281 | f = track->file;
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nkeynes@492 | 282 | } else {
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nkeynes@736 | 283 | f = image->file;
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nkeynes@492 | 284 | }
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nkeynes@492 | 285 |
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nkeynes@644 | 286 | /* First figure out what the real sector mode is for raw/semiraw sectors */
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nkeynes@644 | 287 | int sector_mode;
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nkeynes@644 | 288 | switch( track->mode ) {
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nkeynes@644 | 289 | case GDROM_RAW_NONXA:
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nkeynes@736 | 290 | gdrom_read_block( (unsigned char *)(§head), file_offset, sizeof(secthead), f );
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nkeynes@736 | 291 | sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS;
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nkeynes@736 | 292 | break;
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nkeynes@644 | 293 | case GDROM_RAW_XA:
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nkeynes@736 | 294 | gdrom_read_block( (unsigned char *)(§head), file_offset, sizeof(secthead), f );
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nkeynes@736 | 295 | if( secthead.mode == 1 ) {
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nkeynes@736 | 296 | sector_mode = GDROM_MODE1;
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nkeynes@736 | 297 | } else {
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nkeynes@736 | 298 | sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
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nkeynes@736 | 299 | }
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nkeynes@736 | 300 | break;
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nkeynes@644 | 301 | case GDROM_SEMIRAW_MODE2:
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nkeynes@736 | 302 | gdrom_read_block( secthead.subhead, file_offset, 8, f );
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nkeynes@736 | 303 | sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2;
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nkeynes@736 | 304 | break;
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nkeynes@342 | 305 | default:
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nkeynes@736 | 306 | /* In the other cases, the track mode completely defines the sector mode */
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nkeynes@736 | 307 | sector_mode = track->mode;
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nkeynes@736 | 308 | break;
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nkeynes@644 | 309 | }
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nkeynes@644 | 310 |
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nkeynes@644 | 311 | if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) {
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nkeynes@736 | 312 | return PKT_ERR_BADREADMODE;
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nkeynes@342 | 313 | }
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nkeynes@644 | 314 |
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nkeynes@644 | 315 | /* Ok, we've got a valid sector, check what parts of the sector we need to
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nkeynes@644 | 316 | * return - header | subhead | data | everything
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nkeynes@644 | 317 | */
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nkeynes@644 | 318 | int channels = READ_CD_CHANNELS(mode);
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nkeynes@644 | 319 |
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nkeynes@644 | 320 | if( channels == 0 ) {
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nkeynes@736 | 321 | // legal, if weird
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nkeynes@736 | 322 | *length = 0;
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nkeynes@736 | 323 | return PKT_ERR_OK;
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nkeynes@644 | 324 | } else if( channels == 0xA0 &&
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nkeynes@736 | 325 | (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) {
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nkeynes@736 | 326 | // caller requested a non-contiguous region
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nkeynes@736 | 327 | return PKT_ERR_BADFIELD;
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nkeynes@644 | 328 | } else if( READ_CD_RAW(channels) ) {
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nkeynes@736 | 329 | channels = 0xF0; // implies everything
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nkeynes@644 | 330 | }
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nkeynes@644 | 331 |
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nkeynes@644 | 332 | read_len = 0;
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nkeynes@644 | 333 | int start, size;
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nkeynes@644 | 334 | switch( track->mode ) {
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nkeynes@644 | 335 | case GDROM_CDDA:
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nkeynes@736 | 336 | // audio is nice and simple (assume perfect reads for now)
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nkeynes@736 | 337 | *length = 2352;
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nkeynes@736 | 338 | gdrom_read_block( buf, file_offset, track->sector_size, f );
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nkeynes@736 | 339 | return PKT_ERR_OK;
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nkeynes@644 | 340 | case GDROM_RAW_XA:
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nkeynes@644 | 341 | case GDROM_RAW_NONXA:
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nkeynes@736 | 342 | gdrom_get_read_bounds( sector_mode, channels, &start, &size );
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nkeynes@736 | 343 | gdrom_read_block( buf, file_offset+start, size, f );
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nkeynes@736 | 344 | read_len = size;
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nkeynes@736 | 345 | break;
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nkeynes@644 | 346 | case GDROM_SEMIRAW_MODE2:
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nkeynes@736 | 347 | gdrom_get_read_bounds( sector_mode, channels, &start, &size );
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nkeynes@736 | 348 | if( READ_CD_HEADER(channels) ) {
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nkeynes@736 | 349 | gdrom_build_sector_header( buf, lba, sector_mode );
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nkeynes@736 | 350 | read_len += SECTOR_HEADER_SIZE;
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nkeynes@736 | 351 | size -= SECTOR_HEADER_SIZE;
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nkeynes@736 | 352 | } else {
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nkeynes@736 | 353 | start -= SECTOR_HEADER_SIZE;
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nkeynes@736 | 354 | }
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nkeynes@736 | 355 | gdrom_read_block( buf + read_len, file_offset+start, size, f );
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nkeynes@736 | 356 | read_len += size;
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nkeynes@736 | 357 | break;
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nkeynes@644 | 358 | default: // Data track w/ data only in file
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nkeynes@736 | 359 | if( READ_CD_RAW(channels) ) {
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nkeynes@736 | 360 | gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset,
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nkeynes@736 | 361 | track->sector_size, f );
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nkeynes@736 | 362 | do_encode_L2( buf, sector_mode, lba );
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nkeynes@736 | 363 | read_len = 2352;
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nkeynes@736 | 364 | } else {
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nkeynes@736 | 365 | if( READ_CD_HEADER(channels) ) {
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nkeynes@736 | 366 | gdrom_build_sector_header( buf, lba, sector_mode );
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nkeynes@736 | 367 | read_len += SECTOR_HEADER_SIZE;
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nkeynes@736 | 368 | }
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nkeynes@736 | 369 | if( READ_CD_SUBHEAD(channels) &&
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nkeynes@736 | 370 | (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) {
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nkeynes@736 | 371 | if( sector_mode == GDROM_MODE2_FORM1 ) {
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nkeynes@736 | 372 | *((uint32_t *)(buf+read_len)) = 0;
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nkeynes@736 | 373 | *((uint32_t *)(buf+read_len+4)) = 0;
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nkeynes@736 | 374 | } else {
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nkeynes@736 | 375 | *((uint32_t *)(buf+read_len)) = 0x00200000;
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nkeynes@736 | 376 | *((uint32_t *)(buf+read_len+4)) = 0x00200000;
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nkeynes@736 | 377 | }
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nkeynes@736 | 378 | read_len += 8;
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nkeynes@736 | 379 | }
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nkeynes@736 | 380 | if( READ_CD_DATA(channels) ) {
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nkeynes@736 | 381 | gdrom_read_block( buf+read_len, file_offset, track->sector_size, f );
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nkeynes@736 | 382 | read_len += track->sector_size;
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nkeynes@736 | 383 | }
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nkeynes@736 | 384 | }
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nkeynes@644 | 385 | }
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nkeynes@342 | 386 | *length = read_len;
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nkeynes@342 | 387 | return PKT_ERR_OK;
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nkeynes@342 | 388 | }
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nkeynes@342 | 389 |
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nkeynes@422 | 390 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf )
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nkeynes@342 | 391 | {
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nkeynes@342 | 392 | gdrom_image_t image = (gdrom_image_t)disc;
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nkeynes@342 | 393 | struct gdrom_toc *toc = (struct gdrom_toc *)buf;
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nkeynes@342 | 394 | int i;
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nkeynes@342 | 395 |
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nkeynes@342 | 396 | for( i=0; i<image->track_count; i++ ) {
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nkeynes@736 | 397 | toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags;
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nkeynes@342 | 398 | }
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nkeynes@342 | 399 | toc->first = 0x0100 | image->track[0].flags;
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nkeynes@342 | 400 | toc->last = (image->track_count<<8) | image->track[i-1].flags;
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nkeynes@342 | 401 | toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) |
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nkeynes@736 | 402 | image->track[i-1].flags;
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nkeynes@342 | 403 | for( ;i<99; i++ )
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nkeynes@736 | 404 | toc->track[i] = 0xFFFFFFFF;
|
nkeynes@342 | 405 | return PKT_ERR_OK;
|
nkeynes@342 | 406 | }
|
nkeynes@342 | 407 |
|
nkeynes@422 | 408 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf )
|
nkeynes@342 | 409 | {
|
nkeynes@342 | 410 | gdrom_image_t image = (gdrom_image_t)disc;
|
nkeynes@342 | 411 | struct gdrom_track *last_track = &image->track[image->track_count-1];
|
nkeynes@342 | 412 | unsigned int end_of_disc = last_track->lba + last_track->sector_count;
|
nkeynes@342 | 413 | int i;
|
nkeynes@342 | 414 | buf[0] = 0x01; /* Disc status? */
|
nkeynes@342 | 415 | buf[1] = 0;
|
nkeynes@342 | 416 |
|
nkeynes@342 | 417 | if( session == 0 ) {
|
nkeynes@736 | 418 | buf[2] = last_track->session+1; /* last session */
|
nkeynes@736 | 419 | buf[3] = (end_of_disc >> 16) & 0xFF;
|
nkeynes@736 | 420 | buf[4] = (end_of_disc >> 8) & 0xFF;
|
nkeynes@736 | 421 | buf[5] = end_of_disc & 0xFF;
|
nkeynes@736 | 422 | return PKT_ERR_OK;
|
nkeynes@342 | 423 | } else {
|
nkeynes@736 | 424 | session--;
|
nkeynes@736 | 425 | for( i=0; i<image->track_count; i++ ) {
|
nkeynes@736 | 426 | if( image->track[i].session == session ) {
|
nkeynes@736 | 427 | buf[2] = i+1; /* first track of session */
|
nkeynes@736 | 428 | buf[3] = (image->track[i].lba >> 16) & 0xFF;
|
nkeynes@736 | 429 | buf[4] = (image->track[i].lba >> 8) & 0xFF;
|
nkeynes@736 | 430 | buf[5] = image->track[i].lba & 0xFF;
|
nkeynes@736 | 431 | return PKT_ERR_OK;
|
nkeynes@736 | 432 | }
|
nkeynes@736 | 433 | }
|
nkeynes@736 | 434 | return PKT_ERR_BADFIELD; /* No such session */
|
nkeynes@342 | 435 | }
|
nkeynes@342 | 436 | }
|
nkeynes@342 | 437 |
|
nkeynes@422 | 438 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf )
|
nkeynes@342 | 439 | {
|
nkeynes@342 | 440 | gdrom_image_t image = (gdrom_image_t)disc;
|
nkeynes@342 | 441 | int track_no = gdrom_image_get_track_by_lba( image, lba );
|
nkeynes@342 | 442 | if( track_no == -1 ) {
|
nkeynes@736 | 443 | track_no = 1;
|
nkeynes@736 | 444 | lba = 150;
|
nkeynes@342 | 445 | }
|
nkeynes@342 | 446 | struct gdrom_track *track = &image->track[track_no-1];
|
nkeynes@342 | 447 | uint32_t offset = lba - track->lba;
|
nkeynes@342 | 448 | buf[4] = track->flags;
|
nkeynes@342 | 449 | buf[5] = track_no;
|
nkeynes@342 | 450 | buf[6] = 0x01; /* ?? */
|
nkeynes@342 | 451 | buf[7] = (offset >> 16) & 0xFF;
|
nkeynes@342 | 452 | buf[8] = (offset >> 8) & 0xFF;
|
nkeynes@342 | 453 | buf[9] = offset & 0xFF;
|
nkeynes@342 | 454 | buf[10] = 0;
|
nkeynes@342 | 455 | buf[11] = (lba >> 16) & 0xFF;
|
nkeynes@342 | 456 | buf[12] = (lba >> 8) & 0xFF;
|
nkeynes@342 | 457 | buf[13] = lba & 0xFF;
|
nkeynes@422 | 458 | return PKT_ERR_OK;
|
nkeynes@342 | 459 | }
|
nkeynes@342 | 460 |
|
nkeynes@342 | 461 | static int gdrom_image_drive_status( gdrom_disc_t disc )
|
nkeynes@342 | 462 | {
|
nkeynes@342 | 463 | gdrom_image_t image = (gdrom_image_t)disc;
|
nkeynes@720 | 464 | if( image->disc_type == IDE_DISC_NONE ) {
|
nkeynes@720 | 465 | return IDE_DISC_NONE;
|
nkeynes@720 | 466 | } else {
|
nkeynes@720 | 467 | return image->disc_type | IDE_DISC_READY;
|
nkeynes@720 | 468 | }
|
nkeynes@342 | 469 | }
|
nkeynes@342 | 470 |
|
nkeynes@709 | 471 | gdrom_device_t gdrom_device_new( const gchar *name, const gchar *dev_name )
|
nkeynes@709 | 472 | {
|
nkeynes@709 | 473 | struct gdrom_device *dev = g_malloc0( sizeof(struct gdrom_device) );
|
nkeynes@709 | 474 | dev->name = g_strdup(name);
|
nkeynes@709 | 475 | dev->device_name = g_strdup(dev_name);
|
nkeynes@709 | 476 | return dev;
|
nkeynes@709 | 477 | }
|
nkeynes@709 | 478 |
|
nkeynes@709 | 479 | void gdrom_device_destroy( gdrom_device_t dev )
|
nkeynes@709 | 480 | {
|
nkeynes@709 | 481 | if( dev->name != NULL ) {
|
nkeynes@709 | 482 | g_free( dev->name );
|
nkeynes@709 | 483 | dev->name = NULL;
|
nkeynes@709 | 484 | }
|
nkeynes@709 | 485 | if( dev->device_name != NULL ) {
|
nkeynes@709 | 486 | g_free( dev->device_name );
|
nkeynes@709 | 487 | dev->device_name = NULL;
|
nkeynes@709 | 488 | }
|
nkeynes@709 | 489 | g_free( dev );
|
nkeynes@709 | 490 | }
|
nkeynes@837 | 491 |
|
nkeynes@837 | 492 | /**
|
nkeynes@837 | 493 | * Check the disc for a useable DC bootstrap, and update the disc
|
nkeynes@837 | 494 | * with the title accordingly.
|
nkeynes@837 | 495 | * @return TRUE if we found a bootstrap, otherwise FALSE.
|
nkeynes@837 | 496 | */
|
nkeynes@837 | 497 | gboolean gdrom_image_read_info( gdrom_disc_t d ) {
|
nkeynes@837 | 498 | gdrom_image_t disc = (gdrom_image_t)d;
|
nkeynes@837 | 499 | if( disc->track_count > 0 ) {
|
nkeynes@837 | 500 | /* Find the first data track of the last session */
|
nkeynes@837 | 501 | int last_session = disc->track[disc->track_count-1].session;
|
nkeynes@837 | 502 | int i, boot_track = -1;
|
nkeynes@837 | 503 | for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) {
|
nkeynes@837 | 504 | if( disc->track[i].flags & TRACK_DATA ) {
|
nkeynes@837 | 505 | boot_track = i;
|
nkeynes@837 | 506 | }
|
nkeynes@837 | 507 | }
|
nkeynes@837 | 508 | if( boot_track != -1 ) {
|
nkeynes@837 | 509 | unsigned char boot_sector[MAX_SECTOR_SIZE];
|
nkeynes@837 | 510 | uint32_t length = sizeof(boot_sector);
|
nkeynes@837 | 511 | if( d->read_sector( d, disc->track[boot_track].lba, 0x28,
|
nkeynes@837 | 512 | boot_sector, &length ) == PKT_ERR_OK ) {
|
nkeynes@837 | 513 | if( memcmp( boot_sector, "SEGA SEGAKATANA SEGA ENTERPRISES", 32) == 0 ) {
|
nkeynes@837 | 514 | /* Got magic */
|
nkeynes@837 | 515 | memcpy( d->title, boot_sector+128, 128 );
|
nkeynes@837 | 516 | for( i=127; i>=0; i-- ) {
|
nkeynes@837 | 517 | if( !isspace(d->title[i]) )
|
nkeynes@837 | 518 | break;
|
nkeynes@837 | 519 | }
|
nkeynes@837 | 520 | d->title[i+1] = '\0';
|
nkeynes@837 | 521 | }
|
nkeynes@837 | 522 | bootstrap_dump(boot_sector, FALSE);
|
nkeynes@837 | 523 | return TRUE;
|
nkeynes@837 | 524 | }
|
nkeynes@837 | 525 | }
|
nkeynes@837 | 526 | }
|
nkeynes@837 | 527 | return FALSE;
|
nkeynes@837 | 528 | }
|