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 1.16 2001/11/28 15:08:05 massiot 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>
65 #include "input_dvd.h"
69 #include "modules_export.h"
75 typedef struct partition_s
78 u8 pi_volume_desc[128];
85 dvdcss_handle dvdhandle;
96 /* for direct data access, LSB first */
97 #define GETN1(p) ((u8)pi_data[p])
98 #define GETN2(p) ((u16)pi_data[p]|((u16)pi_data[(p)+1]<<8))
99 #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))
100 #define GETN(p,n,target) memcpy(target,&pi_data[p],n)
103 /*****************************************************************************
104 * UDFReadLB: reads absolute Logical Block of the disc
105 *****************************************************************************
106 * Returns number of read bytes on success, 0 on error
107 *****************************************************************************/
108 static int UDFReadLB( dvdcss_handle dvdhandle, off_t i_lba,
109 size_t i_block_count, u8 *pi_data )
111 if( dvdcss_seek( dvdhandle, i_lba, DVDCSS_NOFLAGS ) < 0 )
113 intf_ErrMsg( "UDF: Postion not found" );
117 return dvdcss_read( dvdhandle, pi_data, i_block_count, DVDCSS_NOFLAGS );
121 /*****************************************************************************
122 * UDFDecode: decode unicode encoded udf data
123 *****************************************************************************/
124 static int UDFDecode( u8 * pi_data, int i_len, char * psz_target )
129 if( !( pi_data[0] & 0x18 ) )
131 psz_target[0] = '\0';
135 if( pi_data[0] & 0x10 )
137 /* ignore MSB of unicode16 */
142 psz_target[i++] = pi_data[p+=2];
149 psz_target[i++] = pi_data[p++];
163 int UDFEntity (u8 *data, u8 *Flags, char *Identifier)
166 strncpy (Identifier, &data[1], 5);
173 /*****************************************************************************
174 * UDFDescriptor: gives a tag ID from your data to find out what it refers to
175 *****************************************************************************/
176 static int UDFDescriptor( u8 * pi_data, u16 * pi_tag_id )
178 pi_tag_id[0] = GETN2( 0 );
179 /* TODO: check CRC 'n stuff */
185 /*****************************************************************************
186 * UDFExtendAD: main volume information
187 *****************************************************************************/
188 static int UDFExtentAD (u8 * pi_data, u32 * pi_length, u32 * pi_location)
190 pi_length[0] = GETN4( 0 );
191 pi_location[0] = GETN4( 4 );
197 /*****************************************************************************
198 * UDFAD: file set information
199 *****************************************************************************/
200 static int UDFAD( u8 * pi_data, struct ad_s * p_ad, u8 i_type,
201 struct partition_s partition )
203 p_ad->i_length = GETN4( 0 );
204 p_ad->i_flags = p_ad->i_length >> 30;
205 p_ad->i_length &= 0x3FFFFFFF;
210 p_ad->i_location = GETN4( 4 );
211 /* use number of current partition */
212 p_ad->i_partition = partition.i_number;
216 p_ad->i_location = GETN4( 4 );
217 p_ad->i_partition = GETN2( 8 );
221 p_ad->i_location = GETN4( 12 );
222 p_ad->i_partition = GETN2( 16 );
230 /*****************************************************************************
231 * UDFICB: takes Information Control Block from pi_data
232 *****************************************************************************/
233 static int UDFICB( u8 * pi_data, u8 * pi_file_type, u16 * pi_flags)
235 pi_file_type[0] = GETN1( 11 );
236 pi_flags[0] = GETN2( 18 );
242 /*****************************************************************************
243 * UDFPartition: gets partition descriptor
244 *****************************************************************************/
245 static int UDFPartition( u8 * pi_data, u16 * pi_flags, u16 * pi_nb,
246 char * ps_contents, u32 * pi_start, u32 * pi_length )
248 pi_flags[0] = GETN2( 20 );
249 pi_nb[0] = GETN2( 22 );
250 GETN( 24, 32, ps_contents );
251 pi_start[0] = GETN4( 188 );
252 pi_length[0] = GETN4( 192 );
258 /*****************************************************************************
259 * UDFLogVolume: reads the volume descriptor and checks the parameters
260 *****************************************************************************
261 * Returns 0 on OK, 1 on error
262 *****************************************************************************/
263 static int UDFLogVolume(u8 * pi_data, char * p_volume_descriptor )
269 UDFDecode( &pi_data[84], 128, p_volume_descriptor );
271 i_lb_size = GETN4( 212 ); // should be 2048
272 i_MT_L = GETN4( 264 ); // should be 6
273 i_N_PM = GETN4( 268 ); // should be 1
275 if( i_lb_size != DVD_LB_SIZE )
277 intf_ErrMsg( "UDF: Non valid sector size (%d)", i_lb_size );
285 /*****************************************************************************
286 * UDFFileEntry: fills a ad_t struct with information at pi_data
287 *****************************************************************************/
288 static int UDFFileEntry( u8 * pi_data, u8 * pi_file_type, struct ad_s * p_ad,
289 struct partition_s partition )
297 UDFICB( &pi_data[16], &i_file_type, &i_flags );
299 pi_file_type[0] = i_file_type;
300 i_L_EA = GETN4( 168 );
301 i_L_AD = GETN4( 172 );
304 while( p < 176 + i_L_EA + i_L_AD )
306 switch( i_flags & 0x07 )
309 UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
313 UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
317 UDFAD( &pi_data[p], p_ad, UDFADext, partition );
324 UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
327 UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
330 UDFAD( &pi_data[p], p_ad, UDFADext, partition );
343 /*****************************************************************************
344 * UDFFileIdentifier: gives filename and characteristics of pi_data
345 *****************************************************************************/
346 static int UDFFileIdentifier( u8 * pi_data, u8 * pi_file_characteristics,
347 char * psz_filename, struct ad_s * p_file_icb,
348 struct partition_s partition )
353 pi_file_characteristics[0] = GETN1( 18 );
354 i_L_FI = GETN1( 19 );
355 UDFAD( &pi_data[20], p_file_icb, UDFADlong, partition );
356 i_L_IU = GETN2( 36 );
360 UDFDecode( &pi_data[38+i_L_IU], i_L_FI, psz_filename );
364 psz_filename[0]='\0';
367 return 4 * ( ( 38 + i_L_FI + i_L_IU + 3 ) / 4 );
371 /*****************************************************************************
372 * UDFMapICB: Maps ICB to FileAD
373 *****************************************************************************
374 * ICB: Location of ICB of directory to scan
375 * FileType: Type of the file
376 * File: Location of file the ICB is pointing to
377 * return 1 on success, 0 on error;
378 *****************************************************************************/
379 static int UDFMapICB( struct ad_s icb, u8 * pi_file_type, struct ad_s * p_file,
380 struct partition_s partition )
382 u8 pi_lb[DVD_LB_SIZE];
386 i_lba = partition.i_start + icb.i_location;
390 if( !UDFReadLB( partition.dvdhandle, i_lba++, 1, pi_lb ) )
396 UDFDescriptor( pi_lb , &i_tag_id );
399 if( i_tag_id == 261 )
401 UDFFileEntry( pi_lb, pi_file_type, p_file, partition );
405 } while( ( i_lba <= partition.i_start + icb.i_location +
406 ( icb.i_length - 1 ) / DVD_LB_SIZE ) && ( i_tag_id != 261 ) );
411 /*****************************************************************************
412 * UDFScanDir: serach filename in dir
413 *****************************************************************************
414 * Dir: Location of directory to scan
415 * FileName: Name of file to look for
416 * FileICB: Location of ICB of the found file
417 * return 1 on success, 0 on error;
418 *****************************************************************************/
419 static int UDFScanDir( struct ad_s dir, char * psz_filename,
420 struct ad_s * p_file_icb, struct partition_s partition )
422 u8 pi_lb[2*DVD_LB_SIZE];
426 char psz_temp[DVD_LB_SIZE];
429 /* Scan dir for ICB of file */
430 i_lba = partition.i_start + dir.i_location;
434 if( !UDFReadLB( partition.dvdhandle, i_lba++, 1, pi_lb ) )
441 while( p < DVD_LB_SIZE )
443 UDFDescriptor( &pi_lb[p], &i_tag_id );
445 if( i_tag_id == 257 )
447 p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
448 psz_temp, p_file_icb, partition );
449 if( !strcasecmp( psz_filename, psz_temp ) )
462 partition.i_start + dir.i_location + ( dir.i_length - 1 ) / DVD_LB_SIZE );
466 if( UDFReadLB( partition.dvdhandle, i_lba, 2, pi_lb ) <= 0 ) {
471 while( p < dir.i_length )
473 if( p > DVD_LB_SIZE )
477 dir.i_length -= DVD_LB_SIZE;
478 if( UDFReadLB( partition.dvdhandle, i_lba, 2, pi_lb ) <= 0 )
484 UDFDescriptor( &pi_lb[p], &i_tag_id );
486 if( i_tag_id == 257 )
488 p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
489 psz_temp, p_file_icb, partition );
490 if( !strcasecmp( psz_filename, psz_temp ) )
505 /*****************************************************************************
506 * UDFFindPartition: looks for a partition on the disc
507 *****************************************************************************
508 * partnum: number of the partition, starting at 0
509 * part: structure to fill with the partition information
510 * return 1 if partition found, 0 on error;
511 *****************************************************************************/
512 static int UDFFindPartition( int i_part_nb, struct partition_s *p_partition )
514 u8 pi_lb[DVD_LB_SIZE];
515 u8 pi_anchor[DVD_LB_SIZE];
522 boolean_t b_vol_valid;
528 /* try #1, prime anchor */
532 /* Search anchor loop */
535 if( UDFReadLB( p_partition->dvdhandle, i_lba, 1, pi_anchor ) )
537 UDFDescriptor( pi_anchor, &i_tag_id );
549 /* final try failed */
555 /* we already found the last sector
556 * try #3, alternative backup anchor */
557 i_lba = i_last_sector;
559 /* but that's just about enough, then! */
564 /* TODO: find last sector of the disc (this is optional) */
567 /* try #2, backup anchor */
568 i_lba = i_last_sector - 256;
572 /* unable to find last sector */
579 /* it is an anchor! continue... */
584 /* main volume descriptor */
585 UDFExtentAD( &pi_anchor[16], &i_MVDS_length, &i_MVDS_location );
587 p_partition->b_valid = 0;
589 p_partition->pi_volume_desc[0] = '\0';
592 /* Find Volume Descriptor */
595 i_lba = i_MVDS_location;
599 if( !UDFReadLB( p_partition->dvdhandle, i_lba++, 1, pi_lb ) )
605 UDFDescriptor( pi_lb, &i_tag_id );
608 if( ( i_tag_id == 5 ) && ( !p_partition->b_valid ) )
610 /* Partition Descriptor */
612 &p_partition->i_flags,
613 &p_partition->i_number,
614 p_partition->pi_contents,
615 &p_partition->i_start,
616 &p_partition->i_length );
617 p_partition->b_valid = ( i_part_nb == p_partition->i_number );
619 else if( ( i_tag_id == 6 ) && ( !b_vol_valid) )
621 /* Logical Volume Descriptor */
622 if( UDFLogVolume( pi_lb , p_partition->pi_volume_desc ) )
624 /* TODO: sector size wrong! */
632 } while( ( i_lba <= i_MVDS_location +
633 ( i_MVDS_length - 1 ) / DVD_LB_SIZE )
635 && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
637 if( ( !p_partition->b_valid ) || ( !b_vol_valid ) )
639 /* backup volume descriptor */
640 UDFExtentAD( &pi_anchor[24], &i_MVDS_length, &i_MVDS_location );
642 } while( i-- && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
644 /* we only care for the partition, not the volume */
645 return( p_partition->b_valid);
649 /*****************************************************************************
650 * DVDUDFFindFile: looks for a file on the UDF disc/imagefile
651 *****************************************************************************
652 * Path has to be the absolute pathname on the UDF filesystem,
654 * returns absolute LB number, or 0 on error
655 *****************************************************************************/
656 u32 DVDUDFFindFile( dvdcss_handle dvdhandle, char * psz_path )
658 struct partition_s partition;
659 struct ad_s root_icb;
664 u8 pi_lb[DVD_LB_SIZE];
666 char psz_tokenline[DVD_LB_SIZE] = "";
670 strcat( psz_tokenline, psz_path );
672 /* Init file descriptor of UDF filesystem (== DVD) */
673 partition.dvdhandle = dvdhandle;
675 /* Find partition 0, standard partition for DVD-Video */
677 if( !UDFFindPartition( i_partition, &partition ) )
679 intf_ErrMsg( "UDF: Partition 0 not found" );
683 /* Find root dir ICB */
684 i_lba = partition.i_start;
688 if( !UDFReadLB( dvdhandle, i_lba++, 1, pi_lb ) )
694 UDFDescriptor( pi_lb, &i_tag_id );
697 if( i_tag_id == 256 )
699 /* File Set Descriptor */
700 UDFAD( &pi_lb[400], &root_icb, UDFADlong, partition );
703 } while( ( i_lba < partition.i_start + partition.i_length )
704 && ( i_tag_id != 8) && ( i_tag_id != 256 ) );
706 if( i_tag_id != 256 )
708 intf_ErrMsg( "UDF: Bad descriptor" );
711 if( root_icb.i_partition != i_partition )
713 intf_ErrMsg( "UDF: Bad partition" );
718 if( !UDFMapICB( root_icb, &i_file_type, &file, partition ) )
720 intf_ErrMsg( "UDF: Can't find root dir" );
724 /* root dir should be dir */
725 if( i_file_type != 4 )
727 intf_ErrMsg( "UDF: Root dir error" );
731 /* Tokenize filepath */
732 psz_token = strtok( psz_tokenline, "/" );
735 if( !UDFScanDir( file, psz_token, &icb, partition ) )
737 intf_ErrMsg( "UDF: Scan dir error" );
741 if( !UDFMapICB ( icb, &i_file_type, &file, partition ) )
743 intf_ErrMsg( "UDF: ICB error" );
747 psz_token = strtok( NULL, "/" );
750 return partition.i_start + file.i_location;