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mpv/libmpdvdkit2/dvd_udf.c

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/*
* This code is based on dvdudf by:
* Christian Wolff <scarabaeus@convergence.de>.
*
* Modifications by:
* Billy Biggs <vektor@dumbterm.net>.
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <assert.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 DVDReadBlocksUDFRaw( 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 = DVDReadBlocksUDFRaw(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;
};
/* 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;
lbnum = partition->Start + ICB.Location;
do {
if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 ) {
TagID = 0;
} else {
UDFDescriptor( LogBlock, &TagID );
}
if( TagID == 261 ) {
UDFFileEntry( LogBlock, FileType, partition, File );
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 )
{
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;
/* Scan dir for ICB of file */
lbnum = partition->Start + Dir.Location;
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;
}
/**
* 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 ], Anchor[ DVD_VIDEO_LB_LEN ];
uint32_t lbnum, MVDS_location, MVDS_length;
uint16_t TagID;
uint32_t lastsector;
int i, terminate, volvalid;
/* 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 );
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 */
UDFExtentAD( &Anchor[ 24 ], &MVDS_length, &MVDS_location );
}
} 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 );
/* Find partition, 0 is the standard location for DVD Video.*/
if( !UDFFindPartition( device, 0, &partition ) ) return 0;
/* 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;
/* Find root dir */
if( !UDFMapICB( device, RootICB, &filetype, &partition, &File ) ) return 0;
if( filetype != 4 ) return 0; /* Root dir should be dir */
/* Tokenize filepath */
token = strtok(tokenline, "/");
while( token != NULL ) {
if( !UDFScanDir( device, File, token, &partition, &ICB ) ) return 0;
if( !UDFMapICB( device, ICB, &filetype, &partition, &File ) ) return 0;
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;
}
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