/*****************************************************************************
* dvd_udf.c: udf filesystem tools.
* ---
- * Mainly used to find asolute logical block adress of *.ifo files
+ * Mainly used to find asolute logical block adress of *.ifo files. It only
+ * contains the basic udf handling functions
*****************************************************************************
* Copyright (C) 1998-2001 VideoLAN
- * $Id: dvd_udf.c,v 1.1 2001/02/15 21:03:27 stef Exp $
+ * $Id: dvd_udf.c,v 1.3 2001/02/20 07:49:12 sam Exp $
*
* Author: Stéphane Borel <stef@via.ecp.fr>
*
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
+
+#define MODULE_NAME dvd
+#include "modules_inner.h"
+
/*
* Preamble
*/
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
-#include <netinet/in.h>
#include "common.h"
#include "intf_msg.h"
+#include "dvd_css.h"
+#include "dvd_ifo.h"
#include "input_dvd.h"
-/*
- * Local structures
- */
+#define UDFADshort 1
+#define UDFADlong 2
+#define UDFADext 4
+
typedef struct partition_s
{
- int i_valid;
- u8 pi_volume_desc[128];
- u16 i_flags;
- u16 i_number;
- u8 pi_contents[32];
- u32 i_accessType;
- u32 i_start;
- u32 i_length;
+ boolean_t b_valid;
+ u8 pi_volume_desc[128];
+ u16 i_flags;
+ u16 i_number;
+ u8 pi_contents[32];
+ u32 i_access_type;
+ u32 i_start;
+ u32 i_length;
+ int i_fd;
} partition_t;
typedef struct ad_s
{
- u32 i_location;
- u32 i_length;
- u8 i_flags;
- u16 i_partition;
+ u32 i_location;
+ u32 i_length;
+ u8 i_flags;
+ u16 i_partition;
} ad_t;
-/*
- * Local functions
- */
+/* for direct data access, LSB first */
+#define GETN1(p) ((u8)pi_data[p])
+#define GETN2(p) ((u16)pi_data[p]|((u16)pi_data[(p)+1]<<8))
+#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))
+#define GETN(p,n,target) memcpy(target,&pi_data[p],n)
+
+
+/*****************************************************************************
+ * UDFReadLB: reads absolute Logical Block of the disc
+ * ---
+ * returns number of read bytes on success, 0 on error
+ *****************************************************************************/
+static int UDFReadLB( int i_fd, off_t i_lba, size_t i_block_count, u8 *pi_data )
+{
+ if( i_fd < 0 )
+ {
+ return 0;
+ }
+
+ if( lseek( i_fd, i_lba * (off_t) DVD_LB_SIZE, SEEK_SET ) < 0 )
+ {
+ intf_ErrMsg( "UDF: Postion not found" );
+ return 0;
+ }
+
+ return read( i_fd, pi_data, i_block_count *DVD_LB_SIZE);
+}
+
/*****************************************************************************
- * UDFDecode: decode udf data that is unicode encoded
+ * UDFDecode: decode unicode encoded udf data
*****************************************************************************/
static int UDFDecode( u8 * pi_data, int i_len, char * psz_target )
{
- int p = 1;
- int i = 0;
+ int p = 1;
+ int i = 0;
- if( !( pi_data[0] & 0x18 ) )
+ if( !( pi_data[0] & 0x18 ) )
{
- psz_target[0] ='\0';
- return 0;
- }
+ psz_target[0] = '\0';
+ return 0;
+ }
- if( data[0] & 0x10 )
- {
+ if( pi_data[0] & 0x10 )
+ {
/* ignore MSB of unicode16 */
- p++;
+ p++;
- while( p < i_len )
+ while( p < i_len )
{
- psz_target[i++] = pi_data[p+=2];
+ psz_target[i++] = pi_data[p+=2];
}
- }
+ }
else
{
- while( p < i_len )
+ while( p < i_len )
{
- psz_target[i++] = pi_data[p++];
+ psz_target[i++] = pi_data[p++];
}
- }
-
- psz_target[i]='\0';
+ }
+
+ psz_target[i]='\0';
+
+ return 0;
+}
+
+#if 0
+/**
+ *
+ **/
+
+int UDFEntity (u8 *data, u8 *Flags, char *Identifier)
+{
+ Flags[0] = data[0];
+ strncpy (Identifier, &data[1], 5);
+
+ return 0;
+}
+#endif
+
+
+/*****************************************************************************
+ * UDFDescriptor: gives a tag ID from your data to find out what it refers to
+ *****************************************************************************/
+static int UDFDescriptor( u8 * pi_data, u16 * pi_tag_id )
+{
+ pi_tag_id[0] = GETN2( 0 );
+ /* TODO: check CRC 'n stuff */
+
+ return 0;
+}
+
+
+/*****************************************************************************
+ * UDFExtendAD: main volume information
+ *****************************************************************************/
+static int UDFExtentAD (u8 * pi_data, u32 * pi_length, u32 * pi_location)
+{
+ pi_length[0] = GETN4( 0 );
+ pi_location[0] = GETN4( 4 );
+
+ return 0;
+}
- return 0;
+
+/*****************************************************************************
+ * UDFAD: file set information
+ *****************************************************************************/
+static int UDFAD( u8 * pi_data, struct ad_s * p_ad, u8 i_type,
+ struct partition_s partition )
+{
+ p_ad->i_length = GETN4( 0 );
+ p_ad->i_flags = p_ad->i_length >> 30;
+ p_ad->i_length &= 0x3FFFFFFF;
+
+ switch( i_type )
+ {
+ case UDFADshort:
+ p_ad->i_location = GETN4( 4 );
+ /* use number of current partition */
+ p_ad->i_partition = partition.i_number;
+ break;
+
+ case UDFADlong:
+ p_ad->i_location = GETN4( 4 );
+ p_ad->i_partition = GETN2( 8 );
+ break;
+
+ case UDFADext:
+ p_ad->i_location = GETN4( 12 );
+ p_ad->i_partition = GETN2( 16 );
+ break;
+ }
+
+ return 0;
+}
+
+
+/*****************************************************************************
+ * UDFICB: takes Information Control Block from pi_data
+ *****************************************************************************/
+static int UDFICB( u8 * pi_data, u8 * pi_file_type, u16 * pi_flags)
+{
+ pi_file_type[0] = GETN1( 11 );
+ pi_flags[0] = GETN2( 18 );
+
+ return 0;
}
+
/*****************************************************************************
- * UDFInit: some check and initialization in udf filesystem
+ * UDFPartition: gets partition descriptor
*****************************************************************************/
-int UDFInit( u8 * pi_data, udf_t * p_udf )
+static int UDFPartition( u8 * pi_data, u16 * pi_flags, u16 * pi_nb,
+ char * ps_contents, u32 * pi_start, u32 * pi_length )
{
- u32i lbsize,MT_L,N_PM;
+ pi_flags[0] = GETN2( 20 );
+ pi_nb[0] = GETN2( 22 );
+ GETN( 24, 32, ps_contents );
+ pi_start[0] = GETN4( 188 );
+ pi_length[0] = GETN4( 192 );
+
+ return 0;
+}
- UDFDecode( &pi_data[84], 128, p_udf->psz_volume_desc );
- lbsize = GETN4(212); // should be 2048
- MT_L = GETN4(264); // should be 6
- N_PM = GETN4(268); // should be 1
- if( lbsize != DVD_LB_SIZE )
+/*****************************************************************************
+ * UDFLogVolume: reads the volume descriptor and checks the parameters
+ * ---
+ * returns 0 on OK, 1 on error
+ *****************************************************************************/
+static int UDFLogVolume(u8 * pi_data, char * p_volume_descriptor )
+{
+ u32 i_lb_size;
+ u32 i_MT_L;
+ u32 i_N_PM;
+
+ UDFDecode( &pi_data[84], 128, p_volume_descriptor );
+
+ i_lb_size = GETN4( 212 ); // should be 2048
+ i_MT_L = GETN4( 264 ); // should be 6
+ i_N_PM = GETN4( 268 ); // should be 1
+
+ if( i_lb_size != DVD_LB_SIZE )
{
- return 1;
+ intf_ErrMsg( "UDF: Non valid sector size (%d)", i_lb_size );
+ return 1;
}
return 0;
}
+
/*****************************************************************************
- * UDFFileEntry:
+ * UDFFileEntry: fills a ad_t struct with information at pi_data
*****************************************************************************/
-int UDFFileEntry (uint8_t *data, uint8_t *FileType, struct AD *ad)
-{
- uint8_t filetype;
- uint16_t flags;
- uint32_t L_EA,L_AD;
- int p;
-
- UDFICB(&data[16],&filetype,&flags);
- FileType[0]=filetype;
- L_EA=GETN4(168);
- L_AD=GETN4(172);
- p=176+L_EA;
-
- while (p<176+L_EA+L_AD) {
- switch (flags&0x07) {
- case 0:
- UDFAD (&data[p], ad, UDFADshort);
- p += 0x08;
- break;
- case 1:
- UDFAD (&data[p], ad, UDFADlong);
- p += 0x10;
- break;
- case 2: UDFAD (&data[p], ad, UDFADext);
- p += 0x14;
- break;
- case 3:
- switch (L_AD) {
- case 0x08:
- UDFAD (&data[p], ad, UDFADshort);
- break;
- case 0x10:
- UDFAD (&data[p], ad, UDFADlong);
- break;
- case 0x14:
- UDFAD (&data[p], ad, UDFADext);
- break;
- }
- default:
- p += L_AD;
- break;
- }
- }
-
- return 0;
+static int UDFFileEntry( u8 * pi_data, u8 * pi_file_type, struct ad_s * p_ad,
+ struct partition_s partition )
+{
+ u8 i_file_type;
+ u16 i_flags;
+ u32 i_L_EA;
+ u32 i_L_AD;
+ int p;
+
+ UDFICB( &pi_data[16], &i_file_type, &i_flags );
+
+ pi_file_type[0] = i_file_type;
+ i_L_EA = GETN4( 168 );
+ i_L_AD = GETN4( 172 );
+ p = 176 + i_L_EA;
+
+ while( p < 176 + i_L_EA + i_L_AD )
+ {
+ switch( i_flags & 0x07 )
+ {
+ case 0:
+ UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
+ p += 0x08;
+ break;
+ case 1:
+ UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
+ p += 0x10;
+ break;
+ case 2:
+ UDFAD( &pi_data[p], p_ad, UDFADext, partition );
+ p += 0x14;
+ break;
+ case 3:
+ switch( i_L_AD )
+ {
+ case 0x08:
+ UDFAD( &pi_data[p], p_ad, UDFADshort, partition );
+ break;
+ case 0x10:
+ UDFAD( &pi_data[p], p_ad, UDFADlong, partition );
+ break;
+ case 0x14:
+ UDFAD( &pi_data[p], p_ad, UDFADext, partition );
+ break;
+ }
+ default:
+ p += i_L_AD;
+ break;
+ }
+ }
+
+ return 0;
}
+
/*****************************************************************************
- * UDFFileIdentifier:
+ * UDFFileIdentifier: gives filename and characteristics of pi_data
*****************************************************************************/
-int UDFFileIdentifier (uint8_t *data, uint8_t *FileCharacteristics, char *FileName, struct AD *FileICB)
+static int UDFFileIdentifier( u8 * pi_data, u8 * pi_file_characteristics,
+ char * psz_filename, struct ad_s * p_file_icb,
+ struct partition_s partition )
{
- uint8_t L_FI;
- uint16_t L_IU;
+ u8 i_L_FI;
+ u16 i_L_IU;
- FileCharacteristics[0]=GETN1(18);
- L_FI=GETN1(19);
- UDFAD(&data[20],FileICB,UDFADlong);
- L_IU=GETN2(36);
+ pi_file_characteristics[0] = GETN1( 18 );
+ i_L_FI = GETN1( 19 );
+ UDFAD( &pi_data[20], p_file_icb, UDFADlong, partition );
+ i_L_IU = GETN2( 36 );
- if (L_FI)
- _Unicodedecode (&data[38+L_IU],L_FI,FileName);
- else
- FileName[0]='\0';
+ if( i_L_FI )
+ {
+ UDFDecode( &pi_data[38+i_L_IU], i_L_FI, psz_filename );
+ }
+ else
+ {
+ psz_filename[0]='\0';
+ }
- return 4*((38+L_FI+L_IU+3)/4);
+ return 4 * ( ( 38 + i_L_FI + i_L_IU + 3 ) / 4 );
}
+/*****************************************************************************
+ * UDFMapICB: 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( struct ad_s icb, u8 * pi_file_type, struct ad_s * p_file,
+ struct partition_s partition )
+{
+ u8 pi_lb[DVD_LB_SIZE];
+ u32 i_lba;
+ u16 i_tag_id;
+
+ i_lba = partition.i_start + icb.i_location;
+
+ do
+ {
+ if( !UDFReadLB( partition.i_fd, i_lba++, 1, pi_lb ) )
+ {
+ i_tag_id = 0;
+ }
+ else
+ {
+ UDFDescriptor( pi_lb , &i_tag_id );
+ }
+
+ if( i_tag_id == 261 )
+ {
+ UDFFileEntry( pi_lb, pi_file_type, p_file, partition );
+ return 1;
+ }
+
+ } while( ( i_lba <= partition.i_start + icb.i_location +
+ ( icb.i_length - 1 ) / DVD_LB_SIZE ) && ( i_tag_id != 261 ) );
+
+ return 0;
+}
+
+/*****************************************************************************
+ * UDFScanDir: serach filename in dir
+ * ---
+ * 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( struct ad_s dir, char * psz_filename,
+ struct ad_s * p_file_icb, struct partition_s partition )
+{
+ u8 pi_lb[DVD_LB_SIZE];
+ u32 i_lba;
+ u16 i_tag_id;
+ u8 i_file_char;
+ char psz_temp[DVD_LB_SIZE];
+ int p;
+
+ /* Scan dir for ICB of file */
+ i_lba = partition.i_start + dir.i_location;
+
+ do
+ {
+ if( !UDFReadLB( partition.i_fd, i_lba++, 1, pi_lb ) )
+ {
+ i_tag_id = 0;
+ }
+ else
+ {
+ p=0;
+ while( p < DVD_LB_SIZE )
+ {
+ UDFDescriptor( &pi_lb[p], &i_tag_id );
+
+ if( i_tag_id == 257 )
+ {
+ p += UDFFileIdentifier( &pi_lb[p], &i_file_char,
+ psz_temp, p_file_icb, partition );
+ if( !strcasecmp( psz_filename, psz_temp ) )
+ {
+ return 1;
+ }
+ }
+ else
+ {
+ p = DVD_LB_SIZE;
+ }
+ }
+ }
+
+ } while( i_lba <=
+ partition.i_start + dir.i_location + ( dir.i_length - 1 ) / DVD_LB_SIZE );
+
+ return 0;
+}
+
+
+/******************************************************************************
+ * UDFFindPartition: looks for a partition on the disc
+ * ---
+ * partnum: number of the partition, starting at 0
+ * part: structure to fill with the partition information
+ * return 1 if partition found, 0 on error;
+ ******************************************************************************/
+static int UDFFindPartition( int i_part_nb, struct partition_s *p_partition )
+{
+ u8 pi_lb[DVD_LB_SIZE];
+ u8 pi_anchor[DVD_LB_SIZE];
+ u16 i_tag_id;
+ u32 i_lba;
+ u32 i_MVDS_location;
+ u32 i_MVDS_length;
+ u32 i_last_sector;
+ boolean_t b_term;
+ boolean_t b_vol_valid;
+ int i;
+
+ /* Find Anchor */
+ i_last_sector = 0;
+
+ /* try #1, prime anchor */
+ i_lba = 256;
+ b_term = 0;
+
+ /* Search anchor loop */
+ while( 1 )
+ {
+ if( UDFReadLB( p_partition->i_fd, i_lba, 1, pi_anchor ) )
+ {
+ UDFDescriptor( pi_anchor, &i_tag_id );
+ }
+ else
+ {
+ i_tag_id = 0;
+ }
+
+ if( i_tag_id != 2 )
+ {
+ /* not an anchor? */
+ if( b_term )
+ {
+ /* final try failed */
+ return 0;
+ }
+
+ if( i_last_sector )
+ {
+ /* we already found the last sector
+ * try #3, alternative backup anchor */
+ i_lba = i_last_sector;
+
+ /* but that's just about enough, then! */
+ b_term = 1;
+ }
+ else
+ {
+ /* TODO: find last sector of the disc (this is optional) */
+ if( i_last_sector )
+ {
+ /* try #2, backup anchor */
+ i_lba = i_last_sector - 256;
+ }
+ else
+ {
+ /* unable to find last sector */
+ return 0;
+ }
+ }
+ }
+ else
+ {
+ /* it is an anchor! continue... */
+ break;
+ }
+ }
+
+ /* main volume descriptor */
+ UDFExtentAD( &pi_anchor[16], &i_MVDS_length, &i_MVDS_location );
+
+ p_partition->b_valid = 0;
+ b_vol_valid = 0;
+ p_partition->pi_volume_desc[0] = '\0';
+
+ i = 1;
+ /* Find Volume Descriptor */
+ do
+ {
+ i_lba = i_MVDS_location;
+
+ do
+ {
+ if( !UDFReadLB( p_partition->i_fd, i_lba++, 1, pi_lb ) )
+ {
+ i_tag_id = 0;
+ }
+ else
+ {
+ UDFDescriptor( pi_lb, &i_tag_id );
+ }
+
+ if( ( i_tag_id == 5 ) && ( !p_partition->b_valid ) )
+ {
+ /* Partition Descriptor */
+ UDFPartition( pi_lb,
+ &p_partition->i_flags,
+ &p_partition->i_number,
+ p_partition->pi_contents,
+ &p_partition->i_start,
+ &p_partition->i_length );
+ p_partition->b_valid = ( i_part_nb == p_partition->i_number );
+ }
+ else if( ( i_tag_id == 6 ) && ( !b_vol_valid) )
+ {
+ /* Logical Volume Descriptor */
+ if( UDFLogVolume( pi_lb , p_partition->pi_volume_desc ) )
+ {
+ /* TODO: sector size wrong! */
+ }
+ else
+ {
+ b_vol_valid = 1;
+ }
+ }
+
+ } while( ( i_lba <= i_MVDS_location +
+ ( i_MVDS_length - 1 ) / DVD_LB_SIZE )
+ && ( i_tag_id != 8 )
+ && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
+
+ if( ( !p_partition->b_valid ) || ( !b_vol_valid ) )
+ {
+ /* backup volume descriptor */
+ UDFExtentAD( &pi_anchor[24], &i_MVDS_length, &i_MVDS_location );
+ }
+ } while( i-- && ( ( !p_partition->b_valid ) || ( !b_vol_valid ) ) );
+
+ /* we only care for the partition, not the volume */
+ return( p_partition->b_valid);
+}
+
+
+/******************************************************************************
+ * UDFFindFile: looks for a file on the UDF disc/imagefile
+ * ---
+ * Path has to be the absolute pathname on the UDF filesystem,
+ * starting with '/'.
+ * returns absolute LB number, or 0 on error
+ ******************************************************************************/
+u32 UDFFindFile( int i_fd, char * psz_path )
+{
+ struct partition_s partition;
+ struct ad_s root_icb;
+ struct ad_s file;
+ struct ad_s icb;
+ u32 i_lba;
+ u16 i_tag_id;
+ u8 pi_lb[DVD_LB_SIZE];
+ u8 i_file_type;
+ char psz_tokenline[DVD_LB_SIZE] = "";
+ char * psz_token;
+ int i_partition;
+
+ strcat( psz_tokenline, psz_path );
+
+ /* Init file descriptor of UDF filesystem (== DVD) */
+ partition.i_fd = i_fd;
+
+ /* Find partition 0, standard partition for DVD-Video */
+ i_partition = 0;
+ if( !UDFFindPartition( i_partition, &partition ) )
+ {
+ intf_ErrMsg( "UDF: Partition 0 not found" );
+ return 0;
+ }
+
+ /* Find root dir ICB */
+ i_lba = partition.i_start;
+
+ do
+ {
+ if( !UDFReadLB( i_fd, i_lba++, 1, pi_lb ) )
+ {
+ i_tag_id = 0;
+ }
+ else
+ {
+ UDFDescriptor( pi_lb, &i_tag_id );
+ }
+
+ if( i_tag_id == 256 )
+ {
+ /* File Set Descriptor */
+ UDFAD( &pi_lb[400], &root_icb, UDFADlong, partition );
+ }
+
+ } while( ( i_lba < partition.i_start + partition.i_length )
+ && ( i_tag_id != 8) && ( i_tag_id != 256 ) );
+
+ if( i_tag_id != 256 )
+ {
+ intf_ErrMsg( "UDF: Bad descriptor" );
+ return 0;
+ }
+ if( root_icb.i_partition != i_partition )
+ {
+ intf_ErrMsg( "UDF: Bad partition" );
+ return 0;
+ }
+
+ /* Find root dir */
+ if( !UDFMapICB( root_icb, &i_file_type, &file, partition ) )
+ {
+ intf_ErrMsg( "UDF: Can't find root dir" );
+ return 0;
+ }
+
+ /* root dir should be dir */
+ if( i_file_type != 4 )
+ {
+ intf_ErrMsg( "UDF: Root dir error" );
+ return 0;
+ }
+
+ /* Tokenize filepath */
+ psz_token = strtok( psz_tokenline, "/" );
+ while( psz_token )
+ {
+ if( !UDFScanDir( file, psz_token, &icb, partition ) )
+ {
+ intf_ErrMsg( "UDF: Scan dir error" );
+ return 0;
+ }
+
+ if( !UDFMapICB ( icb, &i_file_type, &file, partition ) )
+ {
+ intf_ErrMsg( "UDF: ICB error" );
+ return 0;
+ }
+
+ psz_token = strtok( NULL, "/" );
+ }
+
+ return partition.i_start + file.i_location;
+}
projects / vlc / blobdiff