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 1.14 2001/10/13 15:34:21 stef 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 *****************************************************************************/
31 #define MODULE_NAME dvd
32 #include "modules_inner.h"
34 /*****************************************************************************
36 *****************************************************************************/
45 #elif defined( _MSC_VER ) && defined( _WIN32 )
49 #ifdef STRNCASECMP_IN_STRINGS_H
54 # include "dummy_dvdcss.h"
56 # include <videolan/dvdcss.h>
66 #include "input_dvd.h"
70 #include "modules_export.h"
76 typedef struct partition_s
79 u8 pi_volume_desc[128];
86 dvdcss_handle dvdhandle;
97 /* for direct data access, LSB first */
98 #define GETN1(p) ((u8)pi_data[p])
99 #define GETN2(p) ((u16)pi_data[p]|((u16)pi_data[(p)+1]<<8))
100 #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))
101 #define GETN(p,n,target) memcpy(target,&pi_data[p],n)
104 /*****************************************************************************
105 * UDFReadLB: reads absolute Logical Block of the disc
106 *****************************************************************************
107 * Returns number of read bytes on success, 0 on error
108 *****************************************************************************/
109 static int UDFReadLB( dvdcss_handle dvdhandle, off_t i_lba,
110 size_t i_block_count, u8 *pi_data )
112 if( dvdcss_seek( dvdhandle, i_lba, DVDCSS_NOFLAGS ) < 0 )
114 intf_ErrMsg( "UDF: Postion not found" );
118 return dvdcss_read( dvdhandle, pi_data, i_block_count, DVDCSS_NOFLAGS );
122 /*****************************************************************************
123 * UDFDecode: decode unicode encoded udf data
124 *****************************************************************************/
125 static int UDFDecode( u8 * pi_data, int i_len, char * psz_target )
130 if( !( pi_data[0] & 0x18 ) )
132 psz_target[0] = '\0';
136 if( pi_data[0] & 0x10 )
138 /* ignore MSB of unicode16 */
143 psz_target[i++] = pi_data[p+=2];
150 psz_target[i++] = pi_data[p++];
164 int UDFEntity (u8 *data, u8 *Flags, char *Identifier)
167 strncpy (Identifier, &data[1], 5);
174 /*****************************************************************************
175 * UDFDescriptor: gives a tag ID from your data to find out what it refers to
176 *****************************************************************************/
177 static int UDFDescriptor( u8 * pi_data, u16 * pi_tag_id )
179 pi_tag_id[0] = GETN2( 0 );
180 /* TODO: check CRC 'n stuff */
186 /*****************************************************************************
187 * UDFExtendAD: main volume information
188 *****************************************************************************/
189 static int UDFExtentAD (u8 * pi_data, u32 * pi_length, u32 * pi_location)
191 pi_length[0] = GETN4( 0 );
192 pi_location[0] = GETN4( 4 );
198 /*****************************************************************************
199 * UDFAD: file set information
200 *****************************************************************************/
201 static int UDFAD( u8 * pi_data, struct ad_s * p_ad, u8 i_type,
202 struct partition_s partition )
204 p_ad->i_length = GETN4( 0 );
205 p_ad->i_flags = p_ad->i_length >> 30;
206 p_ad->i_length &= 0x3FFFFFFF;
211 p_ad->i_location = GETN4( 4 );
212 /* use number of current partition */
213 p_ad->i_partition = partition.i_number;
217 p_ad->i_location = GETN4( 4 );
218 p_ad->i_partition = GETN2( 8 );
222 p_ad->i_location = GETN4( 12 );
223 p_ad->i_partition = GETN2( 16 );
231 /*****************************************************************************
232 * UDFICB: takes Information Control Block from pi_data
233 *****************************************************************************/
234 static int UDFICB( u8 * pi_data, u8 * pi_file_type, u16 * pi_flags)
236 pi_file_type[0] = GETN1( 11 );
237 pi_flags[0] = GETN2( 18 );
243 /*****************************************************************************
244 * UDFPartition: gets partition descriptor
245 *****************************************************************************/
246 static int UDFPartition( u8 * pi_data, u16 * pi_flags, u16 * pi_nb,
247 char * ps_contents, u32 * pi_start, u32 * pi_length )
249 pi_flags[0] = GETN2( 20 );
250 pi_nb[0] = GETN2( 22 );
251 GETN( 24, 32, ps_contents );
252 pi_start[0] = GETN4( 188 );
253 pi_length[0] = GETN4( 192 );
259 /*****************************************************************************
260 * UDFLogVolume: reads the volume descriptor and checks the parameters
261 *****************************************************************************
262 * Returns 0 on OK, 1 on error
263 *****************************************************************************/
264 static int UDFLogVolume(u8 * pi_data, char * p_volume_descriptor )
270 UDFDecode( &pi_data[84], 128, p_volume_descriptor );
272 i_lb_size = GETN4( 212 ); // should be 2048
273 i_MT_L = GETN4( 264 ); // should be 6
274 i_N_PM = GETN4( 268 ); // should be 1
276 if( i_lb_size != DVD_LB_SIZE )
278 intf_ErrMsg( "UDF: Non valid sector size (%d)", i_lb_size );
286 /*****************************************************************************
287 * UDFFileEntry: fills a ad_t struct with information at pi_data
288 *****************************************************************************/
289 static int UDFFileEntry( u8 * pi_data, u8 * pi_file_type, struct ad_s * p_ad,
290 struct partition_s partition )
298 UDFICB( &pi_data[16], &i_file_type, &i_flags );
300 pi_file_type[0] = i_file_type;
301 i_L_EA = GETN4( 168 );
302 i_L_AD = GETN4( 172 );
305 while( p < 176 + i_L_EA + i_L_AD )
307 switch( i_flags & 0x07 )
310 UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
314 UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
318 UDFAD( &pi_data[p], p_ad, UDFADext, partition );
325 UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
328 UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
331 UDFAD( &pi_data[p], p_ad, UDFADext, partition );
344 /*****************************************************************************
345 * UDFFileIdentifier: gives filename and characteristics of pi_data
346 *****************************************************************************/
347 static int UDFFileIdentifier( u8 * pi_data, u8 * pi_file_characteristics,
348 char * psz_filename, struct ad_s * p_file_icb,
349 struct partition_s partition )
354 pi_file_characteristics[0] = GETN1( 18 );
355 i_L_FI = GETN1( 19 );
356 UDFAD( &pi_data[20], p_file_icb, UDFADlong, partition );
357 i_L_IU = GETN2( 36 );
361 UDFDecode( &pi_data[38+i_L_IU], i_L_FI, psz_filename );
365 psz_filename[0]='\0';
368 return 4 * ( ( 38 + i_L_FI + i_L_IU + 3 ) / 4 );
372 /*****************************************************************************
373 * UDFMapICB: Maps ICB to FileAD
374 *****************************************************************************
375 * ICB: Location of ICB of directory to scan
376 * FileType: Type of the file
377 * File: Location of file the ICB is pointing to
378 * return 1 on success, 0 on error;
379 *****************************************************************************/
380 static int UDFMapICB( struct ad_s icb, u8 * pi_file_type, struct ad_s * p_file,
381 struct partition_s partition )
383 u8 pi_lb[DVD_LB_SIZE];
387 i_lba = partition.i_start + icb.i_location;
391 if( !UDFReadLB( partition.dvdhandle, i_lba++, 1, pi_lb ) )
397 UDFDescriptor( pi_lb , &i_tag_id );
400 if( i_tag_id == 261 )
402 UDFFileEntry( pi_lb, pi_file_type, p_file, partition );
406 } while( ( i_lba <= partition.i_start + icb.i_location +
407 ( icb.i_length - 1 ) / DVD_LB_SIZE ) && ( i_tag_id != 261 ) );
412 /*****************************************************************************
413 * UDFScanDir: serach filename in dir
414 *****************************************************************************
415 * Dir: Location of directory to scan
416 * FileName: Name of file to look for
417 * FileICB: Location of ICB of the found file
418 * return 1 on success, 0 on error;
419 *****************************************************************************/
420 static int UDFScanDir( struct ad_s dir, char * psz_filename,
421 struct ad_s * p_file_icb, struct partition_s partition )
423 u8 pi_lb[2*DVD_LB_SIZE];
427 char psz_temp[DVD_LB_SIZE];
430 /* Scan dir for ICB of file */
431 i_lba = partition.i_start + dir.i_location;
435 if( !UDFReadLB( partition.dvdhandle, i_lba++, 1, pi_lb ) )
442 while( p < DVD_LB_SIZE )
444 UDFDescriptor( &pi_lb[p], &i_tag_id );
446 if( i_tag_id == 257 )
448 p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
449 psz_temp, p_file_icb, partition );
450 if( !strcasecmp( psz_filename, psz_temp ) )
463 partition.i_start + dir.i_location + ( dir.i_length - 1 ) / DVD_LB_SIZE );
467 if( UDFReadLB( partition.dvdhandle, i_lba, 2, pi_lb ) <= 0 ) {
472 while( p < dir.i_length )
474 if( p > DVD_LB_SIZE )
478 dir.i_length -= DVD_LB_SIZE;
479 if( UDFReadLB( partition.dvdhandle, i_lba, 2, pi_lb ) <= 0 )
485 UDFDescriptor( &pi_lb[p], &i_tag_id );
487 if( i_tag_id == 257 )
489 p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
490 psz_temp, p_file_icb, partition );
491 if( !strcasecmp( psz_filename, psz_temp ) )
506 /*****************************************************************************
507 * UDFFindPartition: looks for a partition on the disc
508 *****************************************************************************
509 * partnum: number of the partition, starting at 0
510 * part: structure to fill with the partition information
511 * return 1 if partition found, 0 on error;
512 *****************************************************************************/
513 static int UDFFindPartition( int i_part_nb, struct partition_s *p_partition )
515 u8 pi_lb[DVD_LB_SIZE];
516 u8 pi_anchor[DVD_LB_SIZE];
523 boolean_t b_vol_valid;
529 /* try #1, prime anchor */
533 /* Search anchor loop */
536 if( UDFReadLB( p_partition->dvdhandle, i_lba, 1, pi_anchor ) )
538 UDFDescriptor( pi_anchor, &i_tag_id );
550 /* final try failed */
556 /* we already found the last sector
557 * try #3, alternative backup anchor */
558 i_lba = i_last_sector;
560 /* but that's just about enough, then! */
565 /* TODO: find last sector of the disc (this is optional) */
568 /* try #2, backup anchor */
569 i_lba = i_last_sector - 256;
573 /* unable to find last sector */
580 /* it is an anchor! continue... */
585 /* main volume descriptor */
586 UDFExtentAD( &pi_anchor[16], &i_MVDS_length, &i_MVDS_location );
588 p_partition->b_valid = 0;
590 p_partition->pi_volume_desc[0] = '\0';
593 /* Find Volume Descriptor */
596 i_lba = i_MVDS_location;
600 if( !UDFReadLB( p_partition->dvdhandle, i_lba++, 1, pi_lb ) )
606 UDFDescriptor( pi_lb, &i_tag_id );
609 if( ( i_tag_id == 5 ) && ( !p_partition->b_valid ) )
611 /* Partition Descriptor */
613 &p_partition->i_flags,
614 &p_partition->i_number,
615 p_partition->pi_contents,
616 &p_partition->i_start,
617 &p_partition->i_length );
618 p_partition->b_valid = ( i_part_nb == p_partition->i_number );
620 else if( ( i_tag_id == 6 ) && ( !b_vol_valid) )
622 /* Logical Volume Descriptor */
623 if( UDFLogVolume( pi_lb , p_partition->pi_volume_desc ) )
625 /* TODO: sector size wrong! */
633 } while( ( i_lba <= i_MVDS_location +
634 ( i_MVDS_length - 1 ) / DVD_LB_SIZE )
636 && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
638 if( ( !p_partition->b_valid ) || ( !b_vol_valid ) )
640 /* backup volume descriptor */
641 UDFExtentAD( &pi_anchor[24], &i_MVDS_length, &i_MVDS_location );
643 } while( i-- && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
645 /* we only care for the partition, not the volume */
646 return( p_partition->b_valid);
650 /*****************************************************************************
651 * UDFFindFile: looks for a file on the UDF disc/imagefile
652 *****************************************************************************
653 * Path has to be the absolute pathname on the UDF filesystem,
655 * returns absolute LB number, or 0 on error
656 *****************************************************************************/
657 u32 UDFFindFile( dvdcss_handle dvdhandle, char * psz_path )
659 struct partition_s partition;
660 struct ad_s root_icb;
665 u8 pi_lb[DVD_LB_SIZE];
667 char psz_tokenline[DVD_LB_SIZE] = "";
671 strcat( psz_tokenline, psz_path );
673 /* Init file descriptor of UDF filesystem (== DVD) */
674 partition.dvdhandle = dvdhandle;
676 /* Find partition 0, standard partition for DVD-Video */
678 if( !UDFFindPartition( i_partition, &partition ) )
680 intf_ErrMsg( "UDF: Partition 0 not found" );
684 /* Find root dir ICB */
685 i_lba = partition.i_start;
689 if( !UDFReadLB( dvdhandle, i_lba++, 1, pi_lb ) )
695 UDFDescriptor( pi_lb, &i_tag_id );
698 if( i_tag_id == 256 )
700 /* File Set Descriptor */
701 UDFAD( &pi_lb[400], &root_icb, UDFADlong, partition );
704 } while( ( i_lba < partition.i_start + partition.i_length )
705 && ( i_tag_id != 8) && ( i_tag_id != 256 ) );
707 if( i_tag_id != 256 )
709 intf_ErrMsg( "UDF: Bad descriptor" );
712 if( root_icb.i_partition != i_partition )
714 intf_ErrMsg( "UDF: Bad partition" );
719 if( !UDFMapICB( root_icb, &i_file_type, &file, partition ) )
721 intf_ErrMsg( "UDF: Can't find root dir" );
725 /* root dir should be dir */
726 if( i_file_type != 4 )
728 intf_ErrMsg( "UDF: Root dir error" );
732 /* Tokenize filepath */
733 psz_token = strtok( psz_tokenline, "/" );
736 if( !UDFScanDir( file, psz_token, &icb, partition ) )
738 intf_ErrMsg( "UDF: Scan dir error" );
742 if( !UDFMapICB ( icb, &i_file_type, &file, partition ) )
744 intf_ErrMsg( "UDF: ICB error" );
748 psz_token = strtok( NULL, "/" );
751 return partition.i_start + file.i_location;