filename | src/gdrom/gdimage.c |
changeset | 669:ab344e42bca9 |
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author | nkeynes |
date | Mon May 12 10:00:13 2008 +0000 (15 years ago) |
permissions | -rw-r--r-- |
last change | Cleanup most of the -Wall warnings (getting a bit sloppy...) Convert FP code to use fixed banks rather than indirect pointer (3-4% faster this way now) |
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nkeynes@342 | 1 | /** |
nkeynes@561 | 2 | * $Id$ |
nkeynes@342 | 3 | * |
nkeynes@342 | 4 | * GD-Rom image-file common functions. |
nkeynes@342 | 5 | * |
nkeynes@342 | 6 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@342 | 7 | * |
nkeynes@342 | 8 | * This program is free software; you can redistribute it and/or modify |
nkeynes@342 | 9 | * it under the terms of the GNU General Public License as published by |
nkeynes@342 | 10 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@342 | 11 | * (at your option) any later version. |
nkeynes@342 | 12 | * |
nkeynes@342 | 13 | * This program is distributed in the hope that it will be useful, |
nkeynes@342 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@342 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@342 | 16 | * GNU General Public License for more details. |
nkeynes@342 | 17 | */ |
nkeynes@342 | 18 | |
nkeynes@644 | 19 | #include <assert.h> |
nkeynes@422 | 20 | #include <netinet/in.h> |
nkeynes@422 | 21 | |
nkeynes@342 | 22 | #include "gdrom/gdrom.h" |
nkeynes@342 | 23 | #include "gdrom/packet.h" |
nkeynes@644 | 24 | #include "ecc.h" |
nkeynes@422 | 25 | #include "bootstrap.h" |
nkeynes@342 | 26 | |
nkeynes@342 | 27 | static void gdrom_image_destroy( gdrom_disc_t disc ); |
nkeynes@342 | 28 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, int mode, |
nkeynes@422 | 29 | unsigned char *buf, uint32_t *readlength ); |
nkeynes@422 | 30 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ); |
nkeynes@422 | 31 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf ); |
nkeynes@422 | 32 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf ); |
nkeynes@342 | 33 | static int gdrom_image_drive_status( gdrom_disc_t disc ); |
nkeynes@342 | 34 | |
nkeynes@644 | 35 | static uint8_t gdrom_default_sync[12] = { 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 0 }; |
nkeynes@644 | 36 | |
nkeynes@644 | 37 | #define SECTOR_HEADER_SIZE 16 |
nkeynes@644 | 38 | #define SECTOR_SUBHEADER_SIZE 8 |
nkeynes@644 | 39 | |
nkeynes@644 | 40 | /* Data offset (from start of raw sector) by sector mode */ |
nkeynes@644 | 41 | static int gdrom_data_offset[] = { 16, 16, 16, 24, 24, 0, 8, 0, 0 }; |
nkeynes@644 | 42 | |
nkeynes@644 | 43 | |
nkeynes@644 | 44 | |
nkeynes@498 | 45 | struct cdrom_sector_header { |
nkeynes@498 | 46 | uint8_t sync[12]; |
nkeynes@498 | 47 | uint8_t msf[3]; |
nkeynes@498 | 48 | uint8_t mode; |
nkeynes@644 | 49 | uint8_t subhead[8]; // Mode-2 XA sectors only |
nkeynes@498 | 50 | }; |
nkeynes@342 | 51 | |
nkeynes@342 | 52 | /** |
nkeynes@342 | 53 | * Initialize a gdrom_disc structure with the gdrom_image_* methods |
nkeynes@342 | 54 | */ |
nkeynes@342 | 55 | void gdrom_image_init( gdrom_disc_t disc ) |
nkeynes@342 | 56 | { |
nkeynes@342 | 57 | memset( disc, 0, sizeof(struct gdrom_disc) ); /* safety */ |
nkeynes@342 | 58 | disc->read_sector = gdrom_image_read_sector; |
nkeynes@342 | 59 | disc->read_toc = gdrom_image_read_toc; |
nkeynes@342 | 60 | disc->read_session = gdrom_image_read_session; |
nkeynes@342 | 61 | disc->read_position = gdrom_image_read_position; |
nkeynes@342 | 62 | disc->drive_status = gdrom_image_drive_status; |
nkeynes@342 | 63 | disc->play_audio = NULL; /* not supported yet */ |
nkeynes@342 | 64 | disc->run_time_slice = NULL; /* not needed */ |
nkeynes@342 | 65 | disc->close = gdrom_image_destroy; |
nkeynes@342 | 66 | } |
nkeynes@342 | 67 | |
nkeynes@464 | 68 | gdrom_disc_t gdrom_image_new( const gchar *filename, FILE *f ) |
nkeynes@342 | 69 | { |
nkeynes@342 | 70 | gdrom_image_t image = (gdrom_image_t)calloc(sizeof(struct gdrom_image), 1); |
nkeynes@342 | 71 | if( image == NULL ) { |
nkeynes@342 | 72 | return NULL; |
nkeynes@342 | 73 | } |
nkeynes@644 | 74 | image->disc_type = IDE_DISC_CDROMXA; |
nkeynes@342 | 75 | image->file = f; |
nkeynes@342 | 76 | gdrom_disc_t disc = (gdrom_disc_t)image; |
nkeynes@342 | 77 | gdrom_image_init(disc); |
nkeynes@464 | 78 | if( filename == NULL ) { |
nkeynes@464 | 79 | disc->name = NULL; |
nkeynes@464 | 80 | } else { |
nkeynes@464 | 81 | disc->name = g_strdup(filename); |
nkeynes@464 | 82 | } |
nkeynes@464 | 83 | |
nkeynes@342 | 84 | return disc; |
nkeynes@342 | 85 | } |
nkeynes@342 | 86 | |
nkeynes@342 | 87 | static void gdrom_image_destroy( gdrom_disc_t disc ) |
nkeynes@342 | 88 | { |
nkeynes@492 | 89 | int i; |
nkeynes@492 | 90 | FILE *lastfile = NULL; |
nkeynes@342 | 91 | gdrom_image_t img = (gdrom_image_t)disc; |
nkeynes@342 | 92 | if( img->file != NULL ) { |
nkeynes@342 | 93 | fclose(img->file); |
nkeynes@342 | 94 | img->file = NULL; |
nkeynes@342 | 95 | } |
nkeynes@492 | 96 | for( i=0; i<img->track_count; i++ ) { |
nkeynes@492 | 97 | if( img->track[i].file != NULL && img->track[i].file != lastfile ) { |
nkeynes@492 | 98 | lastfile = img->track[i].file; |
nkeynes@492 | 99 | fclose(lastfile); |
nkeynes@492 | 100 | img->track[i].file = NULL; |
nkeynes@492 | 101 | } |
nkeynes@492 | 102 | } |
nkeynes@464 | 103 | if( disc->name != NULL ) { |
nkeynes@480 | 104 | g_free( (gpointer)disc->name ); |
nkeynes@464 | 105 | disc->name = NULL; |
nkeynes@464 | 106 | } |
nkeynes@342 | 107 | free( disc ); |
nkeynes@342 | 108 | } |
nkeynes@342 | 109 | |
nkeynes@468 | 110 | void gdrom_image_destroy_no_close( gdrom_disc_t disc ) |
nkeynes@468 | 111 | { |
nkeynes@492 | 112 | int i; |
nkeynes@492 | 113 | FILE *lastfile = NULL; |
nkeynes@468 | 114 | gdrom_image_t img = (gdrom_image_t)disc; |
nkeynes@468 | 115 | if( img->file != NULL ) { |
nkeynes@468 | 116 | img->file = NULL; |
nkeynes@468 | 117 | } |
nkeynes@492 | 118 | for( i=0; i<img->track_count; i++ ) { |
nkeynes@492 | 119 | if( img->track[i].file != NULL && img->track[i].file != lastfile ) { |
nkeynes@492 | 120 | lastfile = img->track[i].file; |
nkeynes@492 | 121 | fclose(lastfile); |
nkeynes@492 | 122 | img->track[i].file = NULL; |
nkeynes@492 | 123 | } |
nkeynes@492 | 124 | } |
nkeynes@468 | 125 | if( disc->name != NULL ) { |
nkeynes@480 | 126 | g_free( (gpointer)disc->name ); |
nkeynes@468 | 127 | disc->name = NULL; |
nkeynes@468 | 128 | } |
nkeynes@468 | 129 | free( disc ); |
nkeynes@468 | 130 | } |
nkeynes@468 | 131 | |
nkeynes@342 | 132 | static int gdrom_image_get_track_by_lba( gdrom_image_t image, uint32_t lba ) |
nkeynes@342 | 133 | { |
nkeynes@342 | 134 | int i; |
nkeynes@342 | 135 | for( i=0; i<image->track_count; i++ ) { |
nkeynes@342 | 136 | if( image->track[i].lba <= lba && |
nkeynes@342 | 137 | lba < (image->track[i].lba + image->track[i].sector_count) ) { |
nkeynes@342 | 138 | return i+1; |
nkeynes@342 | 139 | } |
nkeynes@342 | 140 | } |
nkeynes@342 | 141 | return -1; |
nkeynes@342 | 142 | } |
nkeynes@342 | 143 | |
nkeynes@492 | 144 | /** |
nkeynes@492 | 145 | * Read a block from an image file, handling negative file offsets |
nkeynes@492 | 146 | * with 0-fill. |
nkeynes@492 | 147 | */ |
nkeynes@644 | 148 | static gboolean gdrom_read_block( unsigned char *buf, int file_offset, int length, FILE *f ) |
nkeynes@492 | 149 | { |
nkeynes@492 | 150 | if( file_offset < 0 ) { |
nkeynes@492 | 151 | int size = -file_offset; |
nkeynes@492 | 152 | if( size >= length ) { |
nkeynes@492 | 153 | memset( buf, 0, length ); |
nkeynes@669 | 154 | return TRUE; |
nkeynes@492 | 155 | } else { |
nkeynes@492 | 156 | memset( buf, 0, size ); |
nkeynes@492 | 157 | file_offset = 0; |
nkeynes@492 | 158 | length -= size; |
nkeynes@492 | 159 | } |
nkeynes@492 | 160 | } |
nkeynes@492 | 161 | fseek( f, file_offset, SEEK_SET ); |
nkeynes@644 | 162 | return fread( buf, length, 1, f ) == 1; |
nkeynes@492 | 163 | } |
nkeynes@492 | 164 | |
nkeynes@644 | 165 | static void gdrom_build_sector_header( unsigned char *buf, uint32_t lba, |
nkeynes@644 | 166 | gdrom_track_mode_t sector_mode ) |
nkeynes@644 | 167 | { |
nkeynes@644 | 168 | memcpy( buf, gdrom_default_sync, 12 ); |
nkeynes@644 | 169 | cd_build_address( buf, sector_mode, lba ); |
nkeynes@644 | 170 | } |
nkeynes@644 | 171 | |
nkeynes@644 | 172 | /** |
nkeynes@644 | 173 | * Return TRUE if the given read mode + track modes are compatible, |
nkeynes@644 | 174 | * otherwise FALSE. |
nkeynes@644 | 175 | * @param track_mode one of the GDROM_MODE* constants |
nkeynes@644 | 176 | * @param read_mode the READ_CD_MODE from the read request |
nkeynes@644 | 177 | */ |
nkeynes@644 | 178 | static gboolean gdrom_is_compatible_read_mode( int track_mode, int read_mode ) |
nkeynes@644 | 179 | { |
nkeynes@644 | 180 | switch( read_mode ) { |
nkeynes@644 | 181 | case READ_CD_MODE_ANY: |
nkeynes@644 | 182 | return TRUE; |
nkeynes@644 | 183 | case READ_CD_MODE_CDDA: |
nkeynes@644 | 184 | return track_mode == GDROM_CDDA; |
nkeynes@644 | 185 | case READ_CD_MODE_1: |
nkeynes@644 | 186 | return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1; |
nkeynes@644 | 187 | case READ_CD_MODE_2_FORM_1: |
nkeynes@644 | 188 | return track_mode == GDROM_MODE1 || track_mode == GDROM_MODE2_FORM1; |
nkeynes@644 | 189 | case READ_CD_MODE_2_FORM_2: |
nkeynes@644 | 190 | return track_mode == GDROM_MODE2_FORM2; |
nkeynes@644 | 191 | case READ_CD_MODE_2: |
nkeynes@644 | 192 | return track_mode == GDROM_MODE2_FORMLESS; |
nkeynes@644 | 193 | default: |
nkeynes@644 | 194 | return FALSE; |
nkeynes@644 | 195 | } |
nkeynes@644 | 196 | } |
nkeynes@644 | 197 | |
nkeynes@644 | 198 | /** |
nkeynes@644 | 199 | * Determine the start position in a raw sector, and the amount of data to read |
nkeynes@644 | 200 | * in bytes, for a given combination of sector mode and read mode. |
nkeynes@644 | 201 | */ |
nkeynes@644 | 202 | static void gdrom_get_read_bounds( int sector_mode, int read_mode, int *start, int *size ) |
nkeynes@644 | 203 | { |
nkeynes@644 | 204 | if( READ_CD_RAW(read_mode) ) { |
nkeynes@644 | 205 | // whole sector |
nkeynes@644 | 206 | *start = 0; |
nkeynes@644 | 207 | *size = 2352; |
nkeynes@644 | 208 | } else { |
nkeynes@644 | 209 | *size = 0; |
nkeynes@644 | 210 | if( READ_CD_DATA(read_mode) ) { |
nkeynes@644 | 211 | *start = gdrom_data_offset[sector_mode]; |
nkeynes@644 | 212 | *size = gdrom_sector_size[sector_mode]; |
nkeynes@644 | 213 | } |
nkeynes@644 | 214 | |
nkeynes@644 | 215 | if( READ_CD_SUBHEAD(read_mode) && |
nkeynes@644 | 216 | (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) { |
nkeynes@644 | 217 | *start = SECTOR_HEADER_SIZE; |
nkeynes@644 | 218 | *size += SECTOR_SUBHEADER_SIZE; |
nkeynes@644 | 219 | } |
nkeynes@644 | 220 | |
nkeynes@644 | 221 | if( READ_CD_HEADER(read_mode) ) { |
nkeynes@644 | 222 | *size += SECTOR_HEADER_SIZE; |
nkeynes@644 | 223 | *start = 0; |
nkeynes@644 | 224 | } |
nkeynes@644 | 225 | |
nkeynes@644 | 226 | } |
nkeynes@644 | 227 | } |
nkeynes@644 | 228 | |
nkeynes@644 | 229 | /** |
nkeynes@644 | 230 | * Read a single sector from a disc image. If you thought this would be simple, |
nkeynes@644 | 231 | * I have just one thing to say to you: Bwahahahahahahahah. |
nkeynes@644 | 232 | * |
nkeynes@644 | 233 | * Once we've decided that there's a real sector at the requested lba, there's |
nkeynes@644 | 234 | * really two things we need to care about: |
nkeynes@644 | 235 | * 1. Is the sector mode compatible with the requested read mode |
nkeynes@644 | 236 | * 2. Which parts of the sector do we need to return? |
nkeynes@644 | 237 | * (header/subhead/data/raw sector) |
nkeynes@644 | 238 | * |
nkeynes@644 | 239 | * Also note that the disc image may supply us with just the data (most common |
nkeynes@644 | 240 | * case), or may have the full raw sector. In the former case we may need to |
nkeynes@644 | 241 | * generate the missing data on the fly, for which we use libedc to compute the |
nkeynes@644 | 242 | * data correction codes. |
nkeynes@644 | 243 | */ |
nkeynes@342 | 244 | static gdrom_error_t gdrom_image_read_sector( gdrom_disc_t disc, uint32_t lba, |
nkeynes@422 | 245 | int mode, unsigned char *buf, uint32_t *length ) |
nkeynes@342 | 246 | { |
nkeynes@342 | 247 | gdrom_image_t image = (gdrom_image_t)disc; |
nkeynes@498 | 248 | struct cdrom_sector_header secthead; |
nkeynes@422 | 249 | int file_offset, read_len, track_no; |
nkeynes@498 | 250 | |
nkeynes@492 | 251 | FILE *f; |
nkeynes@342 | 252 | |
nkeynes@342 | 253 | track_no = gdrom_image_get_track_by_lba( image, lba ); |
nkeynes@342 | 254 | if( track_no == -1 ) { |
nkeynes@342 | 255 | return PKT_ERR_BADREAD; |
nkeynes@342 | 256 | } |
nkeynes@342 | 257 | struct gdrom_track *track = &image->track[track_no-1]; |
nkeynes@342 | 258 | file_offset = track->offset + track->sector_size * (lba - track->lba); |
nkeynes@342 | 259 | read_len = track->sector_size; |
nkeynes@492 | 260 | if( track->file != NULL ) { |
nkeynes@492 | 261 | f = track->file; |
nkeynes@492 | 262 | } else { |
nkeynes@492 | 263 | f = image->file; |
nkeynes@492 | 264 | } |
nkeynes@492 | 265 | |
nkeynes@644 | 266 | /* First figure out what the real sector mode is for raw/semiraw sectors */ |
nkeynes@644 | 267 | int sector_mode; |
nkeynes@644 | 268 | switch( track->mode ) { |
nkeynes@644 | 269 | case GDROM_RAW_NONXA: |
nkeynes@644 | 270 | gdrom_read_block( (unsigned char *)(§head), file_offset, sizeof(secthead), f ); |
nkeynes@644 | 271 | sector_mode = (secthead.mode == 1) ? GDROM_MODE1 : GDROM_MODE2_FORMLESS; |
nkeynes@644 | 272 | break; |
nkeynes@644 | 273 | case GDROM_RAW_XA: |
nkeynes@644 | 274 | gdrom_read_block( (unsigned char *)(§head), file_offset, sizeof(secthead), f ); |
nkeynes@644 | 275 | if( secthead.mode == 1 ) { |
nkeynes@644 | 276 | sector_mode = GDROM_MODE1; |
nkeynes@644 | 277 | } else { |
nkeynes@644 | 278 | sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2; |
nkeynes@342 | 279 | } |
nkeynes@342 | 280 | break; |
nkeynes@644 | 281 | case GDROM_SEMIRAW_MODE2: |
nkeynes@644 | 282 | gdrom_read_block( secthead.subhead, file_offset, 8, f ); |
nkeynes@644 | 283 | sector_mode = ((secthead.subhead[2] & 0x20) == 0 ) ? GDROM_MODE2_FORM1 : GDROM_MODE2_FORM2; |
nkeynes@644 | 284 | break; |
nkeynes@342 | 285 | default: |
nkeynes@644 | 286 | /* In the other cases, the track mode completely defines the sector mode */ |
nkeynes@644 | 287 | sector_mode = track->mode; |
nkeynes@644 | 288 | break; |
nkeynes@644 | 289 | } |
nkeynes@644 | 290 | |
nkeynes@644 | 291 | if( !gdrom_is_compatible_read_mode(sector_mode, READ_CD_MODE(mode)) ) { |
nkeynes@342 | 292 | return PKT_ERR_BADREADMODE; |
nkeynes@342 | 293 | } |
nkeynes@644 | 294 | |
nkeynes@644 | 295 | /* Ok, we've got a valid sector, check what parts of the sector we need to |
nkeynes@644 | 296 | * return - header | subhead | data | everything |
nkeynes@644 | 297 | */ |
nkeynes@644 | 298 | int channels = READ_CD_CHANNELS(mode); |
nkeynes@644 | 299 | |
nkeynes@644 | 300 | if( channels == 0 ) { |
nkeynes@644 | 301 | // legal, if weird |
nkeynes@644 | 302 | *length = 0; |
nkeynes@644 | 303 | return PKT_ERR_OK; |
nkeynes@644 | 304 | } else if( channels == 0xA0 && |
nkeynes@644 | 305 | (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2 )) { |
nkeynes@644 | 306 | // caller requested a non-contiguous region |
nkeynes@644 | 307 | return PKT_ERR_BADFIELD; |
nkeynes@644 | 308 | } else if( READ_CD_RAW(channels) ) { |
nkeynes@644 | 309 | channels = 0xF0; // implies everything |
nkeynes@644 | 310 | } |
nkeynes@644 | 311 | |
nkeynes@644 | 312 | read_len = 0; |
nkeynes@644 | 313 | int start, size; |
nkeynes@644 | 314 | switch( track->mode ) { |
nkeynes@644 | 315 | case GDROM_CDDA: |
nkeynes@644 | 316 | // audio is nice and simple (assume perfect reads for now) |
nkeynes@644 | 317 | *length = 2352; |
nkeynes@644 | 318 | gdrom_read_block( buf, file_offset, track->sector_size, f ); |
nkeynes@644 | 319 | return PKT_ERR_OK; |
nkeynes@644 | 320 | case GDROM_RAW_XA: |
nkeynes@644 | 321 | case GDROM_RAW_NONXA: |
nkeynes@644 | 322 | gdrom_get_read_bounds( sector_mode, channels, &start, &size ); |
nkeynes@644 | 323 | gdrom_read_block( buf, file_offset+start, size, f ); |
nkeynes@644 | 324 | read_len = size; |
nkeynes@644 | 325 | break; |
nkeynes@644 | 326 | case GDROM_SEMIRAW_MODE2: |
nkeynes@644 | 327 | gdrom_get_read_bounds( sector_mode, channels, &start, &size ); |
nkeynes@644 | 328 | if( READ_CD_HEADER(channels) ) { |
nkeynes@644 | 329 | gdrom_build_sector_header( buf, lba, sector_mode ); |
nkeynes@644 | 330 | read_len += SECTOR_HEADER_SIZE; |
nkeynes@644 | 331 | size -= SECTOR_HEADER_SIZE; |
nkeynes@644 | 332 | } else { |
nkeynes@644 | 333 | start -= SECTOR_HEADER_SIZE; |
nkeynes@644 | 334 | } |
nkeynes@644 | 335 | gdrom_read_block( buf + read_len, file_offset+start, size, f ); |
nkeynes@644 | 336 | read_len += size; |
nkeynes@644 | 337 | break; |
nkeynes@644 | 338 | default: // Data track w/ data only in file |
nkeynes@644 | 339 | if( READ_CD_RAW(channels) ) { |
nkeynes@644 | 340 | gdrom_read_block( buf + gdrom_data_offset[track->mode], file_offset, |
nkeynes@644 | 341 | track->sector_size, f ); |
nkeynes@644 | 342 | do_encode_L2( buf, sector_mode, lba ); |
nkeynes@644 | 343 | read_len = 2352; |
nkeynes@644 | 344 | } else { |
nkeynes@644 | 345 | if( READ_CD_HEADER(channels) ) { |
nkeynes@644 | 346 | gdrom_build_sector_header( buf, lba, sector_mode ); |
nkeynes@644 | 347 | read_len += SECTOR_HEADER_SIZE; |
nkeynes@644 | 348 | } |
nkeynes@644 | 349 | if( READ_CD_SUBHEAD(channels) && |
nkeynes@644 | 350 | (sector_mode == GDROM_MODE2_FORM1 || sector_mode == GDROM_MODE2_FORM2) ) { |
nkeynes@644 | 351 | if( sector_mode == GDROM_MODE2_FORM1 ) { |
nkeynes@644 | 352 | *((uint32_t *)(buf+read_len)) = 0; |
nkeynes@644 | 353 | *((uint32_t *)(buf+read_len+4)) = 0; |
nkeynes@644 | 354 | } else { |
nkeynes@644 | 355 | *((uint32_t *)(buf+read_len)) = 0x00200000; |
nkeynes@644 | 356 | *((uint32_t *)(buf+read_len+4)) = 0x00200000; |
nkeynes@644 | 357 | } |
nkeynes@644 | 358 | read_len += 8; |
nkeynes@644 | 359 | } |
nkeynes@644 | 360 | if( READ_CD_DATA(channels) ) { |
nkeynes@644 | 361 | gdrom_read_block( buf+read_len, file_offset, track->sector_size, f ); |
nkeynes@644 | 362 | read_len += track->sector_size; |
nkeynes@644 | 363 | } |
nkeynes@644 | 364 | } |
nkeynes@644 | 365 | } |
nkeynes@342 | 366 | *length = read_len; |
nkeynes@342 | 367 | return PKT_ERR_OK; |
nkeynes@342 | 368 | } |
nkeynes@342 | 369 | |
nkeynes@422 | 370 | static gdrom_error_t gdrom_image_read_toc( gdrom_disc_t disc, unsigned char *buf ) |
nkeynes@342 | 371 | { |
nkeynes@342 | 372 | gdrom_image_t image = (gdrom_image_t)disc; |
nkeynes@342 | 373 | struct gdrom_toc *toc = (struct gdrom_toc *)buf; |
nkeynes@342 | 374 | int i; |
nkeynes@342 | 375 | |
nkeynes@342 | 376 | for( i=0; i<image->track_count; i++ ) { |
nkeynes@342 | 377 | toc->track[i] = htonl( image->track[i].lba ) | image->track[i].flags; |
nkeynes@342 | 378 | } |
nkeynes@342 | 379 | toc->first = 0x0100 | image->track[0].flags; |
nkeynes@342 | 380 | toc->last = (image->track_count<<8) | image->track[i-1].flags; |
nkeynes@342 | 381 | toc->leadout = htonl(image->track[i-1].lba + image->track[i-1].sector_count) | |
nkeynes@342 | 382 | image->track[i-1].flags; |
nkeynes@342 | 383 | for( ;i<99; i++ ) |
nkeynes@342 | 384 | toc->track[i] = 0xFFFFFFFF; |
nkeynes@342 | 385 | return PKT_ERR_OK; |
nkeynes@342 | 386 | } |
nkeynes@342 | 387 | |
nkeynes@422 | 388 | static gdrom_error_t gdrom_image_read_session( gdrom_disc_t disc, int session, unsigned char *buf ) |
nkeynes@342 | 389 | { |
nkeynes@342 | 390 | gdrom_image_t image = (gdrom_image_t)disc; |
nkeynes@342 | 391 | struct gdrom_track *last_track = &image->track[image->track_count-1]; |
nkeynes@342 | 392 | unsigned int end_of_disc = last_track->lba + last_track->sector_count; |
nkeynes@342 | 393 | int i; |
nkeynes@342 | 394 | buf[0] = 0x01; /* Disc status? */ |
nkeynes@342 | 395 | buf[1] = 0; |
nkeynes@342 | 396 | |
nkeynes@342 | 397 | if( session == 0 ) { |
nkeynes@342 | 398 | buf[2] = last_track->session+1; /* last session */ |
nkeynes@342 | 399 | buf[3] = (end_of_disc >> 16) & 0xFF; |
nkeynes@342 | 400 | buf[4] = (end_of_disc >> 8) & 0xFF; |
nkeynes@342 | 401 | buf[5] = end_of_disc & 0xFF; |
nkeynes@342 | 402 | return PKT_ERR_OK; |
nkeynes@342 | 403 | } else { |
nkeynes@342 | 404 | session--; |
nkeynes@342 | 405 | for( i=0; i<image->track_count; i++ ) { |
nkeynes@342 | 406 | if( image->track[i].session == session ) { |
nkeynes@342 | 407 | buf[2] = i+1; /* first track of session */ |
nkeynes@342 | 408 | buf[3] = (image->track[i].lba >> 16) & 0xFF; |
nkeynes@342 | 409 | buf[4] = (image->track[i].lba >> 8) & 0xFF; |
nkeynes@342 | 410 | buf[5] = image->track[i].lba & 0xFF; |
nkeynes@342 | 411 | return PKT_ERR_OK; |
nkeynes@342 | 412 | } |
nkeynes@342 | 413 | } |
nkeynes@342 | 414 | return PKT_ERR_BADFIELD; /* No such session */ |
nkeynes@342 | 415 | } |
nkeynes@342 | 416 | } |
nkeynes@342 | 417 | |
nkeynes@422 | 418 | static gdrom_error_t gdrom_image_read_position( gdrom_disc_t disc, uint32_t lba, unsigned char *buf ) |
nkeynes@342 | 419 | { |
nkeynes@342 | 420 | gdrom_image_t image = (gdrom_image_t)disc; |
nkeynes@342 | 421 | int track_no = gdrom_image_get_track_by_lba( image, lba ); |
nkeynes@342 | 422 | if( track_no == -1 ) { |
nkeynes@342 | 423 | track_no = 1; |
nkeynes@342 | 424 | lba = 150; |
nkeynes@342 | 425 | } |
nkeynes@342 | 426 | struct gdrom_track *track = &image->track[track_no-1]; |
nkeynes@342 | 427 | uint32_t offset = lba - track->lba; |
nkeynes@342 | 428 | buf[4] = track->flags; |
nkeynes@342 | 429 | buf[5] = track_no; |
nkeynes@342 | 430 | buf[6] = 0x01; /* ?? */ |
nkeynes@342 | 431 | buf[7] = (offset >> 16) & 0xFF; |
nkeynes@342 | 432 | buf[8] = (offset >> 8) & 0xFF; |
nkeynes@342 | 433 | buf[9] = offset & 0xFF; |
nkeynes@342 | 434 | buf[10] = 0; |
nkeynes@342 | 435 | buf[11] = (lba >> 16) & 0xFF; |
nkeynes@342 | 436 | buf[12] = (lba >> 8) & 0xFF; |
nkeynes@342 | 437 | buf[13] = lba & 0xFF; |
nkeynes@422 | 438 | return PKT_ERR_OK; |
nkeynes@342 | 439 | } |
nkeynes@342 | 440 | |
nkeynes@342 | 441 | static int gdrom_image_drive_status( gdrom_disc_t disc ) |
nkeynes@342 | 442 | { |
nkeynes@342 | 443 | gdrom_image_t image = (gdrom_image_t)disc; |
nkeynes@342 | 444 | return image->disc_type | IDE_DISC_READY; |
nkeynes@342 | 445 | } |
nkeynes@342 | 446 | |
nkeynes@342 | 447 | void gdrom_image_dump_info( gdrom_disc_t d ) { |
nkeynes@342 | 448 | gdrom_image_t disc = (gdrom_image_t)d; |
nkeynes@342 | 449 | int i; |
nkeynes@342 | 450 | int last_session = disc->track[disc->track_count-1].session; |
nkeynes@342 | 451 | gboolean is_bootable = FALSE; |
nkeynes@342 | 452 | |
nkeynes@342 | 453 | INFO( "Disc ID: %s, %d tracks in %d sessions", disc->mcn, disc->track_count, |
nkeynes@342 | 454 | disc->track[disc->track_count-1].session + 1 ); |
nkeynes@342 | 455 | if( last_session > 0 ) { |
nkeynes@342 | 456 | /* Boot track is the first data track of the last session, provided that it |
nkeynes@342 | 457 | * cannot be a single-session disc. |
nkeynes@342 | 458 | */ |
nkeynes@342 | 459 | int boot_track = -1; |
nkeynes@342 | 460 | for( i=disc->track_count-1; i>=0 && disc->track[i].session == last_session; i-- ) { |
nkeynes@342 | 461 | if( disc->track[i].flags & TRACK_DATA ) { |
nkeynes@342 | 462 | boot_track = i; |
nkeynes@342 | 463 | } |
nkeynes@342 | 464 | } |
nkeynes@342 | 465 | if( boot_track != -1 ) { |
nkeynes@422 | 466 | unsigned char boot_sector[MAX_SECTOR_SIZE]; |
nkeynes@342 | 467 | uint32_t length = sizeof(boot_sector); |
nkeynes@342 | 468 | if( d->read_sector( d, disc->track[boot_track].lba, 0x28, |
nkeynes@342 | 469 | boot_sector, &length ) == PKT_ERR_OK ) { |
nkeynes@342 | 470 | bootstrap_dump(boot_sector, FALSE); |
nkeynes@342 | 471 | is_bootable = TRUE; |
nkeynes@342 | 472 | } |
nkeynes@342 | 473 | } |
nkeynes@342 | 474 | } |
nkeynes@342 | 475 | if( !is_bootable ) { |
nkeynes@342 | 476 | WARN( "Disc does not appear to be bootable" ); |
nkeynes@342 | 477 | } |
nkeynes@342 | 478 | } |
nkeynes@342 | 479 |
.