1 /*****************************************************************************
2 * dvd_udf.c: udf filesystem tools.
3 *****************************************************************************
4 * Mainly used to find asolute logical block adress of *.ifo files. It only
5 * contains the basic udf handling functions
6 *****************************************************************************
7 * Copyright (C) 1998-2001 VideoLAN
8 * $Id: dvd_udf.c,v 1.8 2001/05/31 03:12:49 sam Exp $
10 * Author: Stéphane Borel <stef@via.ecp.fr>
13 * - dvdudf by Christian Wolff <scarabaeus@convergence.de>
14 * - fixes by Billy Biggs <vektor@dumbterm.net>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
29 *****************************************************************************/
37 # define MODULE_NAME dvd
39 # define MODULE_NAME dvdnocss
42 #include "modules_inner.h"
50 #elif defined( _MSC_VER ) && defined( _WIN32 )
54 #ifdef STRNCASECMP_IN_STRINGS_H
62 #include "input_dvd.h"
68 typedef struct partition_s
71 u8 pi_volume_desc[128];
89 /* for direct data access, LSB first */
90 #define GETN1(p) ((u8)pi_data[p])
91 #define GETN2(p) ((u16)pi_data[p]|((u16)pi_data[(p)+1]<<8))
92 #define GETN4(p) ((u32)pi_data[p]|((u32)pi_data[(p)+1]<<8)|((u32)pi_data[(p)+2]<<16)|((u32)pi_data[(p)+3]<<24))
93 #define GETN(p,n,target) memcpy(target,&pi_data[p],n)
96 /*****************************************************************************
97 * UDFReadLB: reads absolute Logical Block of the disc
98 *****************************************************************************
99 * Returns number of read bytes on success, 0 on error
100 *****************************************************************************/
101 static int UDFReadLB( int i_fd, off_t i_lba, size_t i_block_count, u8 *pi_data )
103 #if !defined( WIN32 )
108 if( (HANDLE) i_fd == INVALID_HANDLE_VALUE )
114 #if !defined( WIN32 )
115 if( lseek( i_fd, i_lba * (off_t) DVD_LB_SIZE, SEEK_SET ) < 0 )
117 if( SetFilePointer( (HANDLE) i_fd, i_lba * (off_t) DVD_LB_SIZE,
118 NULL, FILE_BEGIN ) == -1 )
121 intf_ErrMsg( "UDF: Postion not found" );
125 #if !defined( WIN32 )
126 return read( i_fd, pi_data, i_block_count *DVD_LB_SIZE);
128 if(!ReadFile( (HANDLE) i_fd, pi_data, i_block_count * DVD_LB_SIZE,
129 &read, NULL) || read != i_block_count * DVD_LB_SIZE )
139 /*****************************************************************************
140 * UDFDecode: decode unicode encoded udf data
141 *****************************************************************************/
142 static int UDFDecode( u8 * pi_data, int i_len, char * psz_target )
147 if( !( pi_data[0] & 0x18 ) )
149 psz_target[0] = '\0';
153 if( pi_data[0] & 0x10 )
155 /* ignore MSB of unicode16 */
160 psz_target[i++] = pi_data[p+=2];
167 psz_target[i++] = pi_data[p++];
181 int UDFEntity (u8 *data, u8 *Flags, char *Identifier)
184 strncpy (Identifier, &data[1], 5);
191 /*****************************************************************************
192 * UDFDescriptor: gives a tag ID from your data to find out what it refers to
193 *****************************************************************************/
194 static int UDFDescriptor( u8 * pi_data, u16 * pi_tag_id )
196 pi_tag_id[0] = GETN2( 0 );
197 /* TODO: check CRC 'n stuff */
203 /*****************************************************************************
204 * UDFExtendAD: main volume information
205 *****************************************************************************/
206 static int UDFExtentAD (u8 * pi_data, u32 * pi_length, u32 * pi_location)
208 pi_length[0] = GETN4( 0 );
209 pi_location[0] = GETN4( 4 );
215 /*****************************************************************************
216 * UDFAD: file set information
217 *****************************************************************************/
218 static int UDFAD( u8 * pi_data, struct ad_s * p_ad, u8 i_type,
219 struct partition_s partition )
221 p_ad->i_length = GETN4( 0 );
222 p_ad->i_flags = p_ad->i_length >> 30;
223 p_ad->i_length &= 0x3FFFFFFF;
228 p_ad->i_location = GETN4( 4 );
229 /* use number of current partition */
230 p_ad->i_partition = partition.i_number;
234 p_ad->i_location = GETN4( 4 );
235 p_ad->i_partition = GETN2( 8 );
239 p_ad->i_location = GETN4( 12 );
240 p_ad->i_partition = GETN2( 16 );
248 /*****************************************************************************
249 * UDFICB: takes Information Control Block from pi_data
250 *****************************************************************************/
251 static int UDFICB( u8 * pi_data, u8 * pi_file_type, u16 * pi_flags)
253 pi_file_type[0] = GETN1( 11 );
254 pi_flags[0] = GETN2( 18 );
260 /*****************************************************************************
261 * UDFPartition: gets partition descriptor
262 *****************************************************************************/
263 static int UDFPartition( u8 * pi_data, u16 * pi_flags, u16 * pi_nb,
264 char * ps_contents, u32 * pi_start, u32 * pi_length )
266 pi_flags[0] = GETN2( 20 );
267 pi_nb[0] = GETN2( 22 );
268 GETN( 24, 32, ps_contents );
269 pi_start[0] = GETN4( 188 );
270 pi_length[0] = GETN4( 192 );
276 /*****************************************************************************
277 * UDFLogVolume: reads the volume descriptor and checks the parameters
278 *****************************************************************************
279 * Returns 0 on OK, 1 on error
280 *****************************************************************************/
281 static int UDFLogVolume(u8 * pi_data, char * p_volume_descriptor )
287 UDFDecode( &pi_data[84], 128, p_volume_descriptor );
289 i_lb_size = GETN4( 212 ); // should be 2048
290 i_MT_L = GETN4( 264 ); // should be 6
291 i_N_PM = GETN4( 268 ); // should be 1
293 if( i_lb_size != DVD_LB_SIZE )
295 intf_ErrMsg( "UDF: Non valid sector size (%d)", i_lb_size );
303 /*****************************************************************************
304 * UDFFileEntry: fills a ad_t struct with information at pi_data
305 *****************************************************************************/
306 static int UDFFileEntry( u8 * pi_data, u8 * pi_file_type, struct ad_s * p_ad,
307 struct partition_s partition )
315 UDFICB( &pi_data[16], &i_file_type, &i_flags );
317 pi_file_type[0] = i_file_type;
318 i_L_EA = GETN4( 168 );
319 i_L_AD = GETN4( 172 );
322 while( p < 176 + i_L_EA + i_L_AD )
324 switch( i_flags & 0x07 )
327 UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
331 UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
335 UDFAD( &pi_data[p], p_ad, UDFADext, partition );
342 UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
345 UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
348 UDFAD( &pi_data[p], p_ad, UDFADext, partition );
361 /*****************************************************************************
362 * UDFFileIdentifier: gives filename and characteristics of pi_data
363 *****************************************************************************/
364 static int UDFFileIdentifier( u8 * pi_data, u8 * pi_file_characteristics,
365 char * psz_filename, struct ad_s * p_file_icb,
366 struct partition_s partition )
371 pi_file_characteristics[0] = GETN1( 18 );
372 i_L_FI = GETN1( 19 );
373 UDFAD( &pi_data[20], p_file_icb, UDFADlong, partition );
374 i_L_IU = GETN2( 36 );
378 UDFDecode( &pi_data[38+i_L_IU], i_L_FI, psz_filename );
382 psz_filename[0]='\0';
385 return 4 * ( ( 38 + i_L_FI + i_L_IU + 3 ) / 4 );
389 /*****************************************************************************
390 * UDFMapICB: Maps ICB to FileAD
391 *****************************************************************************
392 * ICB: Location of ICB of directory to scan
393 * FileType: Type of the file
394 * File: Location of file the ICB is pointing to
395 * return 1 on success, 0 on error;
396 *****************************************************************************/
397 static int UDFMapICB( struct ad_s icb, u8 * pi_file_type, struct ad_s * p_file,
398 struct partition_s partition )
400 u8 pi_lb[DVD_LB_SIZE];
404 i_lba = partition.i_start + icb.i_location;
408 if( !UDFReadLB( partition.i_fd, i_lba++, 1, pi_lb ) )
414 UDFDescriptor( pi_lb , &i_tag_id );
417 if( i_tag_id == 261 )
419 UDFFileEntry( pi_lb, pi_file_type, p_file, partition );
423 } while( ( i_lba <= partition.i_start + icb.i_location +
424 ( icb.i_length - 1 ) / DVD_LB_SIZE ) && ( i_tag_id != 261 ) );
429 /*****************************************************************************
430 * UDFScanDir: serach filename in dir
431 *****************************************************************************
432 * Dir: Location of directory to scan
433 * FileName: Name of file to look for
434 * FileICB: Location of ICB of the found file
435 * return 1 on success, 0 on error;
436 *****************************************************************************/
437 static int UDFScanDir( struct ad_s dir, char * psz_filename,
438 struct ad_s * p_file_icb, struct partition_s partition )
440 u8 pi_lb[2*DVD_LB_SIZE];
444 char psz_temp[DVD_LB_SIZE];
447 /* Scan dir for ICB of file */
448 i_lba = partition.i_start + dir.i_location;
452 if( !UDFReadLB( partition.i_fd, i_lba++, 1, pi_lb ) )
459 while( p < DVD_LB_SIZE )
461 UDFDescriptor( &pi_lb[p], &i_tag_id );
463 if( i_tag_id == 257 )
465 p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
466 psz_temp, p_file_icb, partition );
467 if( !strcasecmp( psz_filename, psz_temp ) )
480 partition.i_start + dir.i_location + ( dir.i_length - 1 ) / DVD_LB_SIZE );
484 if( UDFReadLB( partition.i_fd, i_lba, 2, pi_lb ) <= 0 ) {
489 while( p < dir.i_length )
491 if( p > DVD_LB_SIZE )
495 dir.i_length -= DVD_LB_SIZE;
496 if( UDFReadLB( partition.i_fd, i_lba, 2, pi_lb ) <= 0 )
502 UDFDescriptor( &pi_lb[p], &i_tag_id );
504 if( i_tag_id == 257 )
506 p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
507 psz_temp, p_file_icb, partition );
508 if( !strcasecmp( psz_filename, psz_temp ) )
523 /*****************************************************************************
524 * UDFFindPartition: looks for a partition on the disc
525 *****************************************************************************
526 * partnum: number of the partition, starting at 0
527 * part: structure to fill with the partition information
528 * return 1 if partition found, 0 on error;
529 *****************************************************************************/
530 static int UDFFindPartition( int i_part_nb, struct partition_s *p_partition )
532 u8 pi_lb[DVD_LB_SIZE];
533 u8 pi_anchor[DVD_LB_SIZE];
540 boolean_t b_vol_valid;
546 /* try #1, prime anchor */
550 /* Search anchor loop */
553 if( UDFReadLB( p_partition->i_fd, i_lba, 1, pi_anchor ) )
555 UDFDescriptor( pi_anchor, &i_tag_id );
567 /* final try failed */
573 /* we already found the last sector
574 * try #3, alternative backup anchor */
575 i_lba = i_last_sector;
577 /* but that's just about enough, then! */
582 /* TODO: find last sector of the disc (this is optional) */
585 /* try #2, backup anchor */
586 i_lba = i_last_sector - 256;
590 /* unable to find last sector */
597 /* it is an anchor! continue... */
602 /* main volume descriptor */
603 UDFExtentAD( &pi_anchor[16], &i_MVDS_length, &i_MVDS_location );
605 p_partition->b_valid = 0;
607 p_partition->pi_volume_desc[0] = '\0';
610 /* Find Volume Descriptor */
613 i_lba = i_MVDS_location;
617 if( !UDFReadLB( p_partition->i_fd, i_lba++, 1, pi_lb ) )
623 UDFDescriptor( pi_lb, &i_tag_id );
626 if( ( i_tag_id == 5 ) && ( !p_partition->b_valid ) )
628 /* Partition Descriptor */
630 &p_partition->i_flags,
631 &p_partition->i_number,
632 p_partition->pi_contents,
633 &p_partition->i_start,
634 &p_partition->i_length );
635 p_partition->b_valid = ( i_part_nb == p_partition->i_number );
637 else if( ( i_tag_id == 6 ) && ( !b_vol_valid) )
639 /* Logical Volume Descriptor */
640 if( UDFLogVolume( pi_lb , p_partition->pi_volume_desc ) )
642 /* TODO: sector size wrong! */
650 } while( ( i_lba <= i_MVDS_location +
651 ( i_MVDS_length - 1 ) / DVD_LB_SIZE )
653 && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
655 if( ( !p_partition->b_valid ) || ( !b_vol_valid ) )
657 /* backup volume descriptor */
658 UDFExtentAD( &pi_anchor[24], &i_MVDS_length, &i_MVDS_location );
660 } while( i-- && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
662 /* we only care for the partition, not the volume */
663 return( p_partition->b_valid);
667 /*****************************************************************************
668 * UDFFindFile: looks for a file on the UDF disc/imagefile
669 *****************************************************************************
670 * Path has to be the absolute pathname on the UDF filesystem,
672 * returns absolute LB number, or 0 on error
673 *****************************************************************************/
674 u32 UDFFindFile( int i_fd, char * psz_path )
676 struct partition_s partition;
677 struct ad_s root_icb;
682 u8 pi_lb[DVD_LB_SIZE];
684 char psz_tokenline[DVD_LB_SIZE] = "";
688 strcat( psz_tokenline, psz_path );
690 /* Init file descriptor of UDF filesystem (== DVD) */
691 partition.i_fd = i_fd;
693 /* Find partition 0, standard partition for DVD-Video */
695 if( !UDFFindPartition( i_partition, &partition ) )
697 intf_ErrMsg( "UDF: Partition 0 not found" );
701 /* Find root dir ICB */
702 i_lba = partition.i_start;
706 if( !UDFReadLB( i_fd, i_lba++, 1, pi_lb ) )
712 UDFDescriptor( pi_lb, &i_tag_id );
715 if( i_tag_id == 256 )
717 /* File Set Descriptor */
718 UDFAD( &pi_lb[400], &root_icb, UDFADlong, partition );
721 } while( ( i_lba < partition.i_start + partition.i_length )
722 && ( i_tag_id != 8) && ( i_tag_id != 256 ) );
724 if( i_tag_id != 256 )
726 intf_ErrMsg( "UDF: Bad descriptor" );
729 if( root_icb.i_partition != i_partition )
731 intf_ErrMsg( "UDF: Bad partition" );
736 if( !UDFMapICB( root_icb, &i_file_type, &file, partition ) )
738 intf_ErrMsg( "UDF: Can't find root dir" );
742 /* root dir should be dir */
743 if( i_file_type != 4 )
745 intf_ErrMsg( "UDF: Root dir error" );
749 /* Tokenize filepath */
750 psz_token = strtok( psz_tokenline, "/" );
753 if( !UDFScanDir( file, psz_token, &icb, partition ) )
755 intf_ErrMsg( "UDF: Scan dir error" );
759 if( !UDFMapICB ( icb, &i_file_type, &file, partition ) )
761 intf_ErrMsg( "UDF: ICB error" );
765 psz_token = strtok( NULL, "/" );
768 return partition.i_start + file.i_location;