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-rw-r--r--libdvdread/dvd_udf.c1002
1 files changed, 1002 insertions, 0 deletions
diff --git a/libdvdread/dvd_udf.c b/libdvdread/dvd_udf.c
new file mode 100644
index 0000000000..56682e7405
--- /dev/null
+++ b/libdvdread/dvd_udf.c
@@ -0,0 +1,1002 @@
+/*
+ * This code is based on dvdudf by:
+ * Christian Wolff <scarabaeus@convergence.de>.
+ *
+ * Modifications by:
+ * Billy Biggs <vektor@dumbterm.net>.
+ * Björn Englund <d4bjorn@dtek.chalmers.se>.
+ *
+ * Modified for use with MPlayer, changes contained in libdvdread_changes.diff.
+ * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
+ * $Id$
+ *
+ * dvdudf: parse and read the UDF volume information of a DVD Video
+ * Copyright (C) 1999 Christian Wolff for convergence integrated media
+ * GmbH The author can be reached at scarabaeus@convergence.de, the
+ * project's page is at http://linuxtv.org/dvd/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA. Or, point your browser to
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifndef __MINGW32__
+#include <sys/ioctl.h>
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include "dvd_reader.h"
+#include "dvd_udf.h"
+
+/* Private but located in/shared with dvd_reader.c */
+extern int UDFReadBlocksRaw( dvd_reader_t *device, uint32_t lb_number,
+ size_t block_count, unsigned char *data,
+ int encrypted );
+
+/* It's required to either fail or deliver all the blocks asked for. */
+static int DVDReadLBUDF( dvd_reader_t *device, uint32_t lb_number,
+ size_t block_count, unsigned char *data,
+ int encrypted )
+{
+ int ret;
+ size_t count = block_count;
+
+ while(count > 0) {
+
+ ret = UDFReadBlocksRaw(device, lb_number, count, data, encrypted);
+
+ if(ret <= 0) {
+ /* One of the reads failed or nothing more to read, too bad.
+ * We won't even bother returning the reads that went ok. */
+ return ret;
+ }
+
+ count -= (size_t)ret;
+ lb_number += (uint32_t)ret;
+ }
+
+ return block_count;
+}
+
+
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+struct Partition {
+ int valid;
+ char VolumeDesc[128];
+ uint16_t Flags;
+ uint16_t Number;
+ char Contents[32];
+ uint32_t AccessType;
+ uint32_t Start;
+ uint32_t Length;
+};
+
+struct AD {
+ uint32_t Location;
+ uint32_t Length;
+ uint8_t Flags;
+ uint16_t Partition;
+};
+
+struct extent_ad {
+ uint32_t location;
+ uint32_t length;
+};
+
+struct avdp_t {
+ struct extent_ad mvds;
+ struct extent_ad rvds;
+};
+
+struct pvd_t {
+ uint8_t VolumeIdentifier[32];
+ uint8_t VolumeSetIdentifier[128];
+};
+
+struct lbudf {
+ uint32_t lb;
+ uint8_t *data;
+};
+
+struct icbmap {
+ uint32_t lbn;
+ struct AD file;
+ uint8_t filetype;
+};
+
+struct udf_cache {
+ int avdp_valid;
+ struct avdp_t avdp;
+ int pvd_valid;
+ struct pvd_t pvd;
+ int partition_valid;
+ struct Partition partition;
+ int rooticb_valid;
+ struct AD rooticb;
+ int lb_num;
+ struct lbudf *lbs;
+ int map_num;
+ struct icbmap *maps;
+};
+
+typedef enum {
+ PartitionCache, RootICBCache, LBUDFCache, MapCache, AVDPCache, PVDCache
+} UDFCacheType;
+
+extern void *GetUDFCacheHandle(dvd_reader_t *device);
+extern void SetUDFCacheHandle(dvd_reader_t *device, void *cache);
+
+void FreeUDFCache(void *cache)
+{
+ struct udf_cache *c = (struct udf_cache *)cache;
+ if(c == NULL) {
+ return;
+ }
+ if(c->lbs) {
+ free(c->lbs);
+ }
+ if(c->maps) {
+ free(c->maps);
+ }
+ free(c);
+}
+
+
+static int GetUDFCache(dvd_reader_t *device, UDFCacheType type,
+ uint32_t nr, void *data)
+{
+ int n;
+ struct udf_cache *c;
+
+ if(DVDUDFCacheLevel(device, -1) <= 0) {
+ return 0;
+ }
+
+ c = (struct udf_cache *)GetUDFCacheHandle(device);
+
+ if(c == NULL) {
+ return 0;
+ }
+
+ switch(type) {
+ case AVDPCache:
+ if(c->avdp_valid) {
+ *(struct avdp_t *)data = c->avdp;
+ return 1;
+ }
+ break;
+ case PVDCache:
+ if(c->pvd_valid) {
+ *(struct pvd_t *)data = c->pvd;
+ return 1;
+ }
+ break;
+ case PartitionCache:
+ if(c->partition_valid) {
+ *(struct Partition *)data = c->partition;
+ return 1;
+ }
+ break;
+ case RootICBCache:
+ if(c->rooticb_valid) {
+ *(struct AD *)data = c->rooticb;
+ return 1;
+ }
+ break;
+ case LBUDFCache:
+ for(n = 0; n < c->lb_num; n++) {
+ if(c->lbs[n].lb == nr) {
+ *(uint8_t **)data = c->lbs[n].data;
+ return 1;
+ }
+ }
+ break;
+ case MapCache:
+ for(n = 0; n < c->map_num; n++) {
+ if(c->maps[n].lbn == nr) {
+ *(struct icbmap *)data = c->maps[n];
+ return 1;
+ }
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int SetUDFCache(dvd_reader_t *device, UDFCacheType type,
+ uint32_t nr, void *data)
+{
+ int n;
+ struct udf_cache *c;
+
+ if(DVDUDFCacheLevel(device, -1) <= 0) {
+ return 0;
+ }
+
+ c = (struct udf_cache *)GetUDFCacheHandle(device);
+
+ if(c == NULL) {
+ c = calloc(1, sizeof(struct udf_cache));
+ // fprintf(stderr, "calloc: %d\n", sizeof(struct udf_cache));
+ if(c == NULL) {
+ return 0;
+ }
+ SetUDFCacheHandle(device, c);
+ }
+
+
+ switch(type) {
+ case AVDPCache:
+ c->avdp = *(struct avdp_t *)data;
+ c->avdp_valid = 1;
+ break;
+ case PVDCache:
+ c->pvd = *(struct pvd_t *)data;
+ c->pvd_valid = 1;
+ break;
+ case PartitionCache:
+ c->partition = *(struct Partition *)data;
+ c->partition_valid = 1;
+ break;
+ case RootICBCache:
+ c->rooticb = *(struct AD *)data;
+ c->rooticb_valid = 1;
+ break;
+ case LBUDFCache:
+ for(n = 0; n < c->lb_num; n++) {
+ if(c->lbs[n].lb == nr) {
+ /* replace with new data */
+ c->lbs[n].data = *(uint8_t **)data;
+ c->lbs[n].lb = nr;
+ return 1;
+ }
+ }
+ c->lb_num++;
+ c->lbs = realloc(c->lbs, c->lb_num * sizeof(struct lbudf));
+ /*
+ fprintf(stderr, "realloc lb: %d * %d = %d\n",
+ c->lb_num, sizeof(struct lbudf),
+ c->lb_num * sizeof(struct lbudf));
+ */
+ if(c->lbs == NULL) {
+ c->lb_num = 0;
+ return 0;
+ }
+ c->lbs[n].data = *(uint8_t **)data;
+ c->lbs[n].lb = nr;
+ break;
+ case MapCache:
+ for(n = 0; n < c->map_num; n++) {
+ if(c->maps[n].lbn == nr) {
+ /* replace with new data */
+ c->maps[n] = *(struct icbmap *)data;
+ c->maps[n].lbn = nr;
+ return 1;
+ }
+ }
+ c->map_num++;
+ c->maps = realloc(c->maps, c->map_num * sizeof(struct icbmap));
+ /*
+ fprintf(stderr, "realloc maps: %d * %d = %d\n",
+ c->map_num, sizeof(struct icbmap),
+ c->map_num * sizeof(struct icbmap));
+ */
+ if(c->maps == NULL) {
+ c->map_num = 0;
+ return 0;
+ }
+ c->maps[n] = *(struct icbmap *)data;
+ c->maps[n].lbn = nr;
+ break;
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+
+/* For direct data access, LSB first */
+#define GETN1(p) ((uint8_t)data[p])
+#define GETN2(p) ((uint16_t)data[p] | ((uint16_t)data[(p) + 1] << 8))
+#define GETN3(p) ((uint32_t)data[p] | ((uint32_t)data[(p) + 1] << 8) \
+ | ((uint32_t)data[(p) + 2] << 16))
+#define GETN4(p) ((uint32_t)data[p] \
+ | ((uint32_t)data[(p) + 1] << 8) \
+ | ((uint32_t)data[(p) + 2] << 16) \
+ | ((uint32_t)data[(p) + 3] << 24))
+/* This is wrong with regard to endianess */
+#define GETN(p, n, target) memcpy(target, &data[p], n)
+
+static int Unicodedecode( uint8_t *data, int len, char *target )
+{
+ int p = 1, i = 0;
+
+ if( ( data[ 0 ] == 8 ) || ( data[ 0 ] == 16 ) ) do {
+ if( data[ 0 ] == 16 ) p++; /* Ignore MSB of unicode16 */
+ if( p < len ) {
+ target[ i++ ] = data[ p++ ];
+ }
+ } while( p < len );
+
+ target[ i ] = '\0';
+ return 0;
+}
+
+static int UDFDescriptor( uint8_t *data, uint16_t *TagID )
+{
+ *TagID = GETN2(0);
+ // TODO: check CRC 'n stuff
+ return 0;
+}
+
+static int UDFExtentAD( uint8_t *data, uint32_t *Length, uint32_t *Location )
+{
+ *Length = GETN4(0);
+ *Location = GETN4(4);
+ return 0;
+}
+
+static int UDFShortAD( uint8_t *data, struct AD *ad,
+ struct Partition *partition )
+{
+ ad->Length = GETN4(0);
+ ad->Flags = ad->Length >> 30;
+ ad->Length &= 0x3FFFFFFF;
+ ad->Location = GETN4(4);
+ ad->Partition = partition->Number; // use number of current partition
+ return 0;
+}
+
+static int UDFLongAD( uint8_t *data, struct AD *ad )
+{
+ ad->Length = GETN4(0);
+ ad->Flags = ad->Length >> 30;
+ ad->Length &= 0x3FFFFFFF;
+ ad->Location = GETN4(4);
+ ad->Partition = GETN2(8);
+ //GETN(10, 6, Use);
+ return 0;
+}
+
+static int UDFExtAD( uint8_t *data, struct AD *ad )
+{
+ ad->Length = GETN4(0);
+ ad->Flags = ad->Length >> 30;
+ ad->Length &= 0x3FFFFFFF;
+ ad->Location = GETN4(12);
+ ad->Partition = GETN2(16);
+ //GETN(10, 6, Use);
+ return 0;
+}
+
+static int UDFICB( uint8_t *data, uint8_t *FileType, uint16_t *Flags )
+{
+ *FileType = GETN1(11);
+ *Flags = GETN2(18);
+ return 0;
+}
+
+
+static int UDFPartition( uint8_t *data, uint16_t *Flags, uint16_t *Number,
+ char *Contents, uint32_t *Start, uint32_t *Length )
+{
+ *Flags = GETN2(20);
+ *Number = GETN2(22);
+ GETN(24, 32, Contents);
+ *Start = GETN4(188);
+ *Length = GETN4(192);
+ return 0;
+}
+
+/**
+ * Reads the volume descriptor and checks the parameters. Returns 0 on OK, 1
+ * on error.
+ */
+static int UDFLogVolume( uint8_t *data, char *VolumeDescriptor )
+{
+ uint32_t lbsize, MT_L, N_PM;
+ Unicodedecode(&data[84], 128, VolumeDescriptor);
+ lbsize = GETN4(212); // should be 2048
+ MT_L = GETN4(264); // should be 6
+ N_PM = GETN4(268); // should be 1
+ if (lbsize != DVD_VIDEO_LB_LEN) return 1;
+ return 0;
+}
+
+static int UDFFileEntry( uint8_t *data, uint8_t *FileType,
+ struct Partition *partition, struct AD *ad )
+{
+ uint16_t flags;
+ uint32_t L_EA, L_AD;
+ unsigned int p;
+
+ UDFICB( &data[ 16 ], FileType, &flags );
+
+ /* Init ad for an empty file (i.e. there isn't a AD, L_AD == 0 ) */
+ ad->Length = GETN4( 60 ); // Really 8 bytes a 56
+ ad->Flags = 0;
+ ad->Location = 0; // what should we put here?
+ ad->Partition = partition->Number; // use number of current partition
+
+ L_EA = GETN4( 168 );
+ L_AD = GETN4( 172 );
+ p = 176 + L_EA;
+ while( p < 176 + L_EA + L_AD ) {
+ switch( flags & 0x0007 ) {
+ case 0: UDFShortAD( &data[ p ], ad, partition ); p += 8; break;
+ case 1: UDFLongAD( &data[ p ], ad ); p += 16; break;
+ case 2: UDFExtAD( &data[ p ], ad ); p += 20; break;
+ case 3:
+ switch( L_AD ) {
+ case 8: UDFShortAD( &data[ p ], ad, partition ); break;
+ case 16: UDFLongAD( &data[ p ], ad ); break;
+ case 20: UDFExtAD( &data[ p ], ad ); break;
+ }
+ p += L_AD;
+ break;
+ default:
+ p += L_AD; break;
+ }
+ }
+ return 0;
+}
+
+static int UDFFileIdentifier( uint8_t *data, uint8_t *FileCharacteristics,
+ char *FileName, struct AD *FileICB )
+{
+ uint8_t L_FI;
+ uint16_t L_IU;
+
+ *FileCharacteristics = GETN1(18);
+ L_FI = GETN1(19);
+ UDFLongAD(&data[20], FileICB);
+ L_IU = GETN2(36);
+ if (L_FI) Unicodedecode(&data[38 + L_IU], L_FI, FileName);
+ else FileName[0] = '\0';
+ return 4 * ((38 + L_FI + L_IU + 3) / 4);
+}
+
+/**
+ * Maps ICB to FileAD
+ * ICB: Location of ICB of directory to scan
+ * FileType: Type of the file
+ * File: Location of file the ICB is pointing to
+ * return 1 on success, 0 on error;
+ */
+static int UDFMapICB( dvd_reader_t *device, struct AD ICB, uint8_t *FileType,
+ struct Partition *partition, struct AD *File )
+{
+ uint8_t LogBlock[DVD_VIDEO_LB_LEN];
+ uint32_t lbnum;
+ uint16_t TagID;
+ struct icbmap tmpmap;
+
+ lbnum = partition->Start + ICB.Location;
+ tmpmap.lbn = lbnum;
+ if(GetUDFCache(device, MapCache, lbnum, &tmpmap)) {
+ *FileType = tmpmap.filetype;
+ *File = tmpmap.file;
+ return 1;
+ }
+
+ do {
+ if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 ) {
+ TagID = 0;
+ } else {
+ UDFDescriptor( LogBlock, &TagID );
+ }
+
+ if( TagID == 261 ) {
+ UDFFileEntry( LogBlock, FileType, partition, File );
+ tmpmap.file = *File;
+ tmpmap.filetype = *FileType;
+ SetUDFCache(device, MapCache, tmpmap.lbn, &tmpmap);
+ return 1;
+ };
+ } while( ( lbnum <= partition->Start + ICB.Location + ( ICB.Length - 1 )
+ / DVD_VIDEO_LB_LEN ) && ( TagID != 261 ) );
+
+ return 0;
+}
+
+/**
+ * Dir: Location of directory to scan
+ * FileName: Name of file to look for
+ * FileICB: Location of ICB of the found file
+ * return 1 on success, 0 on error;
+ */
+static int UDFScanDir( dvd_reader_t *device, struct AD Dir, char *FileName,
+ struct Partition *partition, struct AD *FileICB,
+ int cache_file_info)
+{
+ char filename[ MAX_UDF_FILE_NAME_LEN ];
+ uint8_t directory[ 2 * DVD_VIDEO_LB_LEN ];
+ uint32_t lbnum;
+ uint16_t TagID;
+ uint8_t filechar;
+ unsigned int p;
+ uint8_t *cached_dir = NULL;
+ uint32_t dir_lba;
+ struct AD tmpICB;
+ int found = 0;
+ int in_cache = 0;
+
+ /* Scan dir for ICB of file */
+ lbnum = partition->Start + Dir.Location;
+
+ if(DVDUDFCacheLevel(device, -1) > 0) {
+ /* caching */
+
+ if(!GetUDFCache(device, LBUDFCache, lbnum, &cached_dir)) {
+ dir_lba = (Dir.Length + DVD_VIDEO_LB_LEN) / DVD_VIDEO_LB_LEN;
+ if((cached_dir = malloc(dir_lba * DVD_VIDEO_LB_LEN)) == NULL) {
+ return 0;
+ }
+ if( DVDReadLBUDF( device, lbnum, dir_lba, cached_dir, 0) <= 0 ) {
+ free(cached_dir);
+ cached_dir = NULL;
+ }
+ /*
+ if(cached_dir) {
+ fprintf(stderr, "malloc dir: %d\n",
+ dir_lba * DVD_VIDEO_LB_LEN);
+ }
+ */
+ SetUDFCache(device, LBUDFCache, lbnum, &cached_dir);
+ } else {
+ in_cache = 1;
+ }
+
+ if(cached_dir == NULL) {
+ return 0;
+ }
+
+ p = 0;
+
+ while( p < Dir.Length ) {
+ UDFDescriptor( &cached_dir[ p ], &TagID );
+ if( TagID == 257 ) {
+ p += UDFFileIdentifier( &cached_dir[ p ], &filechar,
+ filename, &tmpICB );
+ if(cache_file_info && !in_cache) {
+ uint8_t tmpFiletype;
+ struct AD tmpFile;
+
+ if( !strcasecmp( FileName, filename ) ) {
+ *FileICB = tmpICB;
+ found = 1;
+
+ }
+ UDFMapICB(device, tmpICB, &tmpFiletype,
+ partition, &tmpFile);
+ } else {
+ if( !strcasecmp( FileName, filename ) ) {
+ *FileICB = tmpICB;
+ return 1;
+ }
+ }
+ } else {
+ if(cache_file_info && (!in_cache) && found) {
+ return 1;
+ }
+ return 0;
+ }
+ }
+ if(cache_file_info && (!in_cache) && found) {
+ return 1;
+ }
+ return 0;
+ }
+
+ if( DVDReadLBUDF( device, lbnum, 2, directory, 0 ) <= 0 ) {
+ return 0;
+ }
+
+ p = 0;
+ while( p < Dir.Length ) {
+ if( p > DVD_VIDEO_LB_LEN ) {
+ ++lbnum;
+ p -= DVD_VIDEO_LB_LEN;
+ Dir.Length -= DVD_VIDEO_LB_LEN;
+ if( DVDReadLBUDF( device, lbnum, 2, directory, 0 ) <= 0 ) {
+ return 0;
+ }
+ }
+ UDFDescriptor( &directory[ p ], &TagID );
+ if( TagID == 257 ) {
+ p += UDFFileIdentifier( &directory[ p ], &filechar,
+ filename, FileICB );
+ if( !strcasecmp( FileName, filename ) ) {
+ return 1;
+ }
+ } else {
+ return 0;
+ }
+ }
+
+ return 0;
+}
+
+
+static int UDFGetAVDP( dvd_reader_t *device,
+ struct avdp_t *avdp)
+{
+ uint8_t Anchor[ DVD_VIDEO_LB_LEN ];
+ uint32_t lbnum, MVDS_location, MVDS_length;
+ uint16_t TagID;
+ uint32_t lastsector;
+ int terminate;
+ struct avdp_t;
+
+ if(GetUDFCache(device, AVDPCache, 0, avdp)) {
+ return 1;
+ }
+
+ /* Find Anchor */
+ lastsector = 0;
+ lbnum = 256; /* Try #1, prime anchor */
+ terminate = 0;
+
+ for(;;) {
+ if( DVDReadLBUDF( device, lbnum, 1, Anchor, 0 ) > 0 ) {
+ UDFDescriptor( Anchor, &TagID );
+ } else {
+ TagID = 0;
+ }
+ if (TagID != 2) {
+ /* Not an anchor */
+ if( terminate ) return 0; /* Final try failed */
+
+ if( lastsector ) {
+
+ /* We already found the last sector. Try #3, alternative
+ * backup anchor. If that fails, don't try again.
+ */
+ lbnum = lastsector;
+ terminate = 1;
+ } else {
+ /* TODO: Find last sector of the disc (this is optional). */
+ if( lastsector ) {
+ /* Try #2, backup anchor */
+ lbnum = lastsector - 256;
+ } else {
+ /* Unable to find last sector */
+ return 0;
+ }
+ }
+ } else {
+ /* It's an anchor! We can leave */
+ break;
+ }
+ }
+ /* Main volume descriptor */
+ UDFExtentAD( &Anchor[ 16 ], &MVDS_length, &MVDS_location );
+ avdp->mvds.location = MVDS_location;
+ avdp->mvds.length = MVDS_length;
+
+ /* Backup volume descriptor */
+ UDFExtentAD( &Anchor[ 24 ], &MVDS_length, &MVDS_location );
+ avdp->rvds.location = MVDS_location;
+ avdp->rvds.length = MVDS_length;
+
+ SetUDFCache(device, AVDPCache, 0, avdp);
+
+ return 1;
+}
+
+/**
+ * Looks for partition on the disc. Returns 1 if partition found, 0 on error.
+ * partnum: Number of the partition, starting at 0.
+ * part: structure to fill with the partition information
+ */
+static int UDFFindPartition( dvd_reader_t *device, int partnum,
+ struct Partition *part )
+{
+ uint8_t LogBlock[ DVD_VIDEO_LB_LEN ];
+ uint32_t lbnum, MVDS_location, MVDS_length;
+ uint16_t TagID;
+ int i, volvalid;
+ struct avdp_t avdp;
+
+
+ if(!UDFGetAVDP(device, &avdp)) {
+ return 0;
+ }
+
+ /* Main volume descriptor */
+ MVDS_location = avdp.mvds.location;
+ MVDS_length = avdp.mvds.length;
+
+ part->valid = 0;
+ volvalid = 0;
+ part->VolumeDesc[ 0 ] = '\0';
+ i = 1;
+ do {
+ /* Find Volume Descriptor */
+ lbnum = MVDS_location;
+ do {
+
+ if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 ) {
+ TagID = 0;
+ } else {
+ UDFDescriptor( LogBlock, &TagID );
+ }
+
+ if( ( TagID == 5 ) && ( !part->valid ) ) {
+ /* Partition Descriptor */
+ UDFPartition( LogBlock, &part->Flags, &part->Number,
+ part->Contents, &part->Start, &part->Length );
+ part->valid = ( partnum == part->Number );
+ } else if( ( TagID == 6 ) && ( !volvalid ) ) {
+ /* Logical Volume Descriptor */
+ if( UDFLogVolume( LogBlock, part->VolumeDesc ) ) {
+ /* TODO: sector size wrong! */
+ } else {
+ volvalid = 1;
+ }
+ }
+
+ } while( ( lbnum <= MVDS_location + ( MVDS_length - 1 )
+ / DVD_VIDEO_LB_LEN ) && ( TagID != 8 )
+ && ( ( !part->valid ) || ( !volvalid ) ) );
+
+ if( ( !part->valid) || ( !volvalid ) ) {
+ /* Backup volume descriptor */
+ MVDS_location = avdp.mvds.location;
+ MVDS_length = avdp.mvds.length;
+ }
+ } while( i-- && ( ( !part->valid ) || ( !volvalid ) ) );
+
+ /* We only care for the partition, not the volume */
+ return part->valid;
+}
+
+uint32_t UDFFindFile( dvd_reader_t *device, char *filename,
+ uint32_t *filesize )
+{
+ uint8_t LogBlock[ DVD_VIDEO_LB_LEN ];
+ uint32_t lbnum;
+ uint16_t TagID;
+ struct Partition partition;
+ struct AD RootICB, File, ICB;
+ char tokenline[ MAX_UDF_FILE_NAME_LEN ];
+ char *token;
+ uint8_t filetype;
+
+ *filesize = 0;
+ tokenline[0] = '\0';
+ strcat( tokenline, filename );
+
+
+ if(!(GetUDFCache(device, PartitionCache, 0, &partition) &&
+ GetUDFCache(device, RootICBCache, 0, &RootICB))) {
+ /* Find partition, 0 is the standard location for DVD Video.*/
+ if( !UDFFindPartition( device, 0, &partition ) ) return 0;
+ SetUDFCache(device, PartitionCache, 0, &partition);
+
+ /* Find root dir ICB */
+ lbnum = partition.Start;
+ do {
+ if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 ) {
+ TagID = 0;
+ } else {
+ UDFDescriptor( LogBlock, &TagID );
+ }
+
+ /* File Set Descriptor */
+ if( TagID == 256 ) { // File Set Descriptor
+ UDFLongAD( &LogBlock[ 400 ], &RootICB );
+ }
+ } while( ( lbnum < partition.Start + partition.Length )
+ && ( TagID != 8 ) && ( TagID != 256 ) );
+
+ /* Sanity checks. */
+ if( TagID != 256 ) return 0;
+ if( RootICB.Partition != 0 ) return 0;
+ SetUDFCache(device, RootICBCache, 0, &RootICB);
+ }
+
+ /* Find root dir */
+ if( !UDFMapICB( device, RootICB, &filetype, &partition, &File ) ) return 0;
+ if( filetype != 4 ) return 0; /* Root dir should be dir */
+
+ {
+ int cache_file_info = 0;
+ /* Tokenize filepath */
+ token = strtok(tokenline, "/");
+
+ while( token != NULL ) {
+
+ if( !UDFScanDir( device, File, token, &partition, &ICB,
+ cache_file_info)) {
+ return 0;
+ }
+ if( !UDFMapICB( device, ICB, &filetype, &partition, &File ) ) {
+ return 0;
+ }
+ if(!strcmp(token, "VIDEO_TS")) {
+ cache_file_info = 1;
+ }
+ token = strtok( NULL, "/" );
+ }
+ }
+
+ /* Sanity check. */
+ if( File.Partition != 0 ) return 0;
+
+ *filesize = File.Length;
+ /* Hack to not return partition.Start for empty files. */
+ if( !File.Location )
+ return 0;
+ else
+ return partition.Start + File.Location;
+}
+
+
+
+/**
+ * Gets a Descriptor .
+ * Returns 1 if descriptor found, 0 on error.
+ * id, tagid of descriptor
+ * bufsize, size of BlockBuf (must be >= DVD_VIDEO_LB_LEN).
+ */
+static int UDFGetDescriptor( dvd_reader_t *device, int id,
+ uint8_t *descriptor, int bufsize)
+{
+ uint32_t lbnum, MVDS_location, MVDS_length;
+ struct avdp_t avdp;
+ uint16_t TagID;
+ uint32_t lastsector;
+ int i, terminate;
+ int desc_found = 0;
+ /* Find Anchor */
+ lastsector = 0;
+ lbnum = 256; /* Try #1, prime anchor */
+ terminate = 0;
+ if(bufsize < DVD_VIDEO_LB_LEN) {
+ return 0;
+ }
+
+ if(!UDFGetAVDP(device, &avdp)) {
+ return 0;
+ }
+
+ /* Main volume descriptor */
+ MVDS_location = avdp.mvds.location;
+ MVDS_length = avdp.mvds.length;
+
+ i = 1;
+ do {
+ /* Find Descriptor */
+ lbnum = MVDS_location;
+ do {
+
+ if( DVDReadLBUDF( device, lbnum++, 1, descriptor, 0 ) <= 0 ) {
+ TagID = 0;
+ } else {
+ UDFDescriptor( descriptor, &TagID );
+ }
+
+ if( (TagID == id) && ( !desc_found ) ) {
+ /* Descriptor */
+ desc_found = 1;
+ }
+ } while( ( lbnum <= MVDS_location + ( MVDS_length - 1 )
+ / DVD_VIDEO_LB_LEN ) && ( TagID != 8 )
+ && ( !desc_found) );
+
+ if( !desc_found ) {
+ /* Backup volume descriptor */
+ MVDS_location = avdp.rvds.location;
+ MVDS_length = avdp.rvds.length;
+ }
+ } while( i-- && ( !desc_found ) );
+
+ return desc_found;
+}
+
+
+static int UDFGetPVD(dvd_reader_t *device, struct pvd_t *pvd)
+{
+ uint8_t pvd_buf[DVD_VIDEO_LB_LEN];
+
+ if(GetUDFCache(device, PVDCache, 0, pvd)) {
+ return 1;
+ }
+
+ if(!UDFGetDescriptor( device, 1, pvd_buf, sizeof(pvd_buf))) {
+ return 0;
+ }
+
+ memcpy(pvd->VolumeIdentifier, &pvd_buf[24], 32);
+ memcpy(pvd->VolumeSetIdentifier, &pvd_buf[72], 128);
+ SetUDFCache(device, PVDCache, 0, pvd);
+
+ return 1;
+}
+
+/**
+ * Gets the Volume Identifier string, in 8bit unicode (latin-1)
+ * volid, place to put the string
+ * volid_size, size of the buffer volid points to
+ * returns the size of buffer needed for all data
+ */
+int UDFGetVolumeIdentifier(dvd_reader_t *device, char *volid,
+ unsigned int volid_size)
+{
+ struct pvd_t pvd;
+ unsigned int volid_len;
+
+ /* get primary volume descriptor */
+ if(!UDFGetPVD(device, &pvd)) {
+ return 0;
+ }
+
+ volid_len = pvd.VolumeIdentifier[31];
+ if(volid_len > 31) {
+ /* this field is only 32 bytes something is wrong */
+ volid_len = 31;
+ }
+ if(volid_size > volid_len) {
+ volid_size = volid_len;
+ }
+ Unicodedecode(pvd.VolumeIdentifier, volid_size, volid);
+
+ return volid_len;
+}
+
+/**
+ * Gets the Volume Set Identifier, as a 128-byte dstring (not decoded)
+ * WARNING This is not a null terminated string
+ * volsetid, place to put the data
+ * volsetid_size, size of the buffer volsetid points to
+ * the buffer should be >=128 bytes to store the whole volumesetidentifier
+ * returns the size of the available volsetid information (128)
+ * or 0 on error
+ */
+int UDFGetVolumeSetIdentifier(dvd_reader_t *device, uint8_t *volsetid,
+ unsigned int volsetid_size)
+{
+ struct pvd_t pvd;
+
+ /* get primary volume descriptor */
+ if(!UDFGetPVD(device, &pvd)) {
+ return 0;
+ }
+
+
+ if(volsetid_size > 128) {
+ volsetid_size = 128;
+ }
+
+ memcpy(volsetid, pvd.VolumeSetIdentifier, volsetid_size);
+
+ return 128;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 15:37:46 +0000