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mpv/libmpdvdkit2/dvd_reader.c

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/*
* Copyright (C) 2001, 2002 Billy Biggs <vektor@dumbterm.net>,
* Håkan Hjort <d95hjort@dtek.chalmers.se>
*
* 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, USA.
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h> /* For the timing of dvdcss_title crack. */
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <dirent.h>
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__bsdi__)|| defined(__DARWIN__)
#define SYS_BSD 1
#endif
#if defined(__sun)
#include <sys/mnttab.h>
#elif defined(hpux)
#include </usr/conf/h/mnttab.h>
#elif defined(SYS_BSD)
#include <fstab.h>
#elif defined(__linux__)
#include <mntent.h>
#endif
#ifdef __MINGW32__
#include <sys/timeb.h>
static void gettimeofday(struct timeval* t,void* timezone){
struct timeb timebuffer;
ftime( &timebuffer );
t->tv_sec=timebuffer.time;
t->tv_usec=1000*timebuffer.millitm;
}
#endif
#include "dvd_udf.h"
#include "dvd_input.h"
#include "dvd_reader.h"
struct dvd_reader_s {
/* Basic information. */
int isImageFile;
/* Hack for keeping track of the css status.
* 0: no css, 1: perhaps (need init of keys), 2: have done init */
int css_state;
int css_title; /* Last title that we have called DVDinpute_title for. */
/* Information required for an image file. */
dvd_input_t dev;
/* Information required for a directory path drive. */
char *path_root;
};
struct dvd_file_s {
/* Basic information. */
dvd_reader_t *dvd;
/* Hack for selecting the right css title. */
int css_title;
/* Information required for an image file. */
uint32_t lb_start;
uint32_t seek_pos;
/* Information required for a directory path drive. */
size_t title_sizes[ 9 ];
dvd_input_t title_devs[ 9 ];
/* Calculated at open-time, size in blocks. */
ssize_t filesize;
};
/* Loop over all titles and call dvdcss_title to crack the keys. */
static int initAllCSSKeys( dvd_reader_t *dvd )
{
struct timeval all_s, all_e;
struct timeval t_s, t_e;
char filename[ MAX_UDF_FILE_NAME_LEN ];
uint32_t start, len;
int title;
fprintf( stderr, "\n" );
fprintf( stderr, "libdvdread: Attempting to retrieve all CSS keys\n" );
fprintf( stderr, "libdvdread: This can take a _long_ time, "
"please be patient\n\n" );
gettimeofday(&all_s, NULL);
for( title = 0; title < 100; title++ ) {
gettimeofday( &t_s, NULL );
if( title == 0 ) {
sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
} else {
sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, 0 );
}
start = UDFFindFile( dvd, filename, &len );
if( start != 0 && len != 0 ) {
/* Perform CSS key cracking for this title. */
fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n",
filename, start );
if( DVDinput_title( dvd->dev, (int)start ) < 0 ) {
fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)\n", filename, start);
}
gettimeofday( &t_e, NULL );
fprintf( stderr, "libdvdread: Elapsed time %ld\n",
(long int) t_e.tv_sec - t_s.tv_sec );
}
if( title == 0 ) continue;
gettimeofday( &t_s, NULL );
sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, 1 );
start = UDFFindFile( dvd, filename, &len );
if( start == 0 || len == 0 ) break;
/* Perform CSS key cracking for this title. */
fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n",
filename, start );
if( DVDinput_title( dvd->dev, (int)start ) < 0 ) {
fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)!!\n", filename, start);
}
gettimeofday( &t_e, NULL );
fprintf( stderr, "libdvdread: Elapsed time %ld\n",
(long int) t_e.tv_sec - t_s.tv_sec );
}
title--;
fprintf( stderr, "libdvdread: Found %d VTS's\n", title );
gettimeofday(&all_e, NULL);
fprintf( stderr, "libdvdread: Elapsed time %ld\n",
(long int) all_e.tv_sec - all_s.tv_sec );
return 0;
}
#ifndef HAVE_MPLAYER
#include "get_path.c"
#else
extern char * get_path( char * filename );
#endif
//extern char * dvdcss_cache_dir;
/**
* Open a DVD image or block device file.
*/
static dvd_reader_t *DVDOpenImageFile( const char *location, int have_css )
{
dvd_reader_t *dvd;
dvd_input_t dev;
/* setup cache dir is no longer needed, it's now implemented in libdvdcss.c
if(!dvdcss_cache_dir){
dvdcss_cache_dir=get_path( "" );
if ( dvdcss_cache_dir ) { mkdir( dvdcss_cache_dir,493 ); free( dvdcss_cache_dir ); }
dvdcss_cache_dir=get_path( "DVDKeys" );
if(dvdcss_cache_dir) mkdir( dvdcss_cache_dir,493 );
}
*/
/* open it */
dev = DVDinput_open( location );
if( !dev ) {
fprintf( stderr, "libdvdread: Can't open %s for reading\n", location );
return 0;
}
dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
if( !dvd ) return 0;
dvd->isImageFile = 1;
dvd->dev = dev;
dvd->path_root = 0;
if( have_css ) {
/* Only if DVDCSS_METHOD = title, a bit if it's disc or if
* DVDCSS_METHOD = key but region missmatch. Unfortunaly we
* don't have that information. */
dvd->css_state = 1; /* Need key init. */
}
return dvd;
}
static dvd_reader_t *DVDOpenPath( const char *path_root )
{
dvd_reader_t *dvd;
dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
if( !dvd ) return 0;
dvd->isImageFile = 0;
dvd->dev = 0;
dvd->path_root = strdup( path_root );
return dvd;
}
#if defined(__sun)
/* /dev/rdsk/c0t6d0s0 (link to /devices/...)
/vol/dev/rdsk/c0t6d0/??
/vol/rdsk/<name> */
static char *sun_block2char( const char *path )
{
char *new_path;
/* Must contain "/dsk/" */
if( !strstr( path, "/dsk/" ) ) return (char *) strdup( path );
/* Replace "/dsk/" with "/rdsk/" */
new_path = malloc( strlen(path) + 2 );
strcpy( new_path, path );
strcpy( strstr( new_path, "/dsk/" ), "" );
strcat( new_path, "/rdsk/" );
strcat( new_path, strstr( path, "/dsk/" ) + strlen( "/dsk/" ) );
return new_path;
}
#endif
#if defined(SYS_BSD)
/* FreeBSD /dev/(r)(a)cd0c (a is for atapi), recomended to _not_ use r
OpenBSD /dev/rcd0c, it needs to be the raw device
NetBSD /dev/rcd0[d|c|..] d for x86, c (for non x86), perhaps others
Darwin /dev/rdisk0, it needs to be the raw device
BSD/OS /dev/sr0c (if not mounted) or /dev/rsr0c ('c' any letter will do) */
static char *bsd_block2char( const char *path )
{
char *new_path;
/* If it doesn't start with "/dev/" or does start with "/dev/r" exit */
if( strncmp( path, "/dev/", 5 ) || !strncmp( path, "/dev/r", 6 ) )
return (char *) strdup( path );
/* Replace "/dev/" with "/dev/r" */
new_path = malloc( strlen(path) + 2 );
strcpy( new_path, "/dev/r" );
strcat( new_path, path + strlen( "/dev/" ) );
return new_path;
}
#endif
dvd_reader_t *DVDOpen( const char *path )
{
struct stat fileinfo;
int ret, have_css;
char *dev_name = 0;
if( !path ) return 0;
#ifdef WIN32
/* Stat doesn't work on devices under mingwin/cygwin. */
if( path[0] && path[1] == ':' && path[2] == '\0' )
{
/* Don't try to stat the file */
fileinfo.st_mode = S_IFBLK;
}
else
#endif
{
ret = stat( path, &fileinfo );
if( ret < 0 ) {
/* If we can't stat the file, give up */
fprintf( stderr, "libdvdread: Can't stat %s\n", path );
perror("");
return 0;
}
}
/* Try to open libdvdcss or fall back to standard functions */
have_css = DVDInputSetup();
/* First check if this is a block/char device or a file*/
if( S_ISBLK( fileinfo.st_mode ) ||
S_ISCHR( fileinfo.st_mode ) ||
S_ISREG( fileinfo.st_mode ) ) {
/**
* Block devices and regular files are assumed to be DVD-Video images.
*/
#if defined(__sun)
return DVDOpenImageFile( sun_block2char( path ), have_css );
#elif defined(SYS_BSD)
return DVDOpenImageFile( bsd_block2char( path ), have_css );
#else
return DVDOpenImageFile( path, have_css );
#endif
} else if( S_ISDIR( fileinfo.st_mode ) ) {
dvd_reader_t *auth_drive = 0;
char *path_copy;
#if defined(SYS_BSD)
struct fstab* fe;
#elif defined(__sun) || defined(__linux__)
FILE *mntfile;
#endif
/* XXX: We should scream real loud here. */
if( !(path_copy = strdup( path ) ) ) return 0;
/* Resolve any symlinks and get the absolut dir name. */
{
char *new_path;
int cdir = open( ".", O_RDONLY );
if( cdir >= 0 ) {
chdir( path_copy );
new_path = getcwd( NULL, PATH_MAX );
#ifndef __MINGW32__
fchdir( cdir );
#endif
close( cdir );
if( new_path ) {
free( path_copy );
path_copy = new_path;
}
}
}
/**
* If we're being asked to open a directory, check if that directory
* is the mountpoint for a DVD-ROM which we can use instead.
*/
if( strlen( path_copy ) > 1 ) {
if( path_copy[ strlen( path_copy ) - 1 ] == '/' )
path_copy[ strlen( path_copy ) - 1 ] = '\0';
}
if( strlen( path_copy ) > 9 ) {
if( !strcasecmp( &(path_copy[ strlen( path_copy ) - 9 ]),
"/video_ts" ) ) {
path_copy[ strlen( path_copy ) - 9 ] = '\0';
}
}
#if defined(SYS_BSD)
if( ( fe = getfsfile( path_copy ) ) ) {
dev_name = bsd_block2char( fe->fs_spec );
fprintf( stderr,
"libdvdread: Attempting to use device %s"
" mounted on %s for CSS authentication\n",
dev_name,
fe->fs_file );
auth_drive = DVDOpenImageFile( dev_name, have_css );
}
#elif defined(__sun)
mntfile = fopen( MNTTAB, "r" );
if( mntfile ) {
struct mnttab mp;
int res;
while( ( res = getmntent( mntfile, &mp ) ) != -1 ) {
if( res == 0 && !strcmp( mp.mnt_mountp, path_copy ) ) {
dev_name = sun_block2char( mp.mnt_special );
fprintf( stderr,
"libdvdread: Attempting to use device %s"
" mounted on %s for CSS authentication\n",
dev_name,
mp.mnt_mountp );
auth_drive = DVDOpenImageFile( dev_name, have_css );
break;
}
}
fclose( mntfile );
}
#elif defined(__linux__)
mntfile = fopen( MOUNTED, "r" );
if( mntfile ) {
struct mntent *me;
while( ( me = getmntent( mntfile ) ) ) {
if( !strcmp( me->mnt_dir, path_copy ) ) {
fprintf( stderr,
"libdvdread: Attempting to use device %s"
" mounted on %s for CSS authentication\n",
me->mnt_fsname,
me->mnt_dir );
auth_drive = DVDOpenImageFile( me->mnt_fsname, have_css );
dev_name = strdup(me->mnt_fsname);
break;
}
}
fclose( mntfile );
}
#elif defined(WIN32)
dev_name = strdup(path);
auth_drive = DVDOpenImageFile( path, have_css );
#endif
if( !dev_name ) {
fprintf( stderr, "libdvdread: Couldn't find device name.\n" );
} else if( !auth_drive ) {
fprintf( stderr, "libdvdread: Device %s inaccessible, "
"CSS authentication not available.\n", dev_name );
}
free( dev_name );
free( path_copy );
/**
* If we've opened a drive, just use that.
*/
if( auth_drive ) return auth_drive;
/**
* Otherwise, we now try to open the directory tree instead.
*/
return DVDOpenPath( path );
}
/* If it's none of the above, screw it. */
fprintf( stderr, "libdvdread: Could not open %s\n", path );
return 0;
}
void DVDClose( dvd_reader_t *dvd )
{
if( dvd ) {
if( dvd->dev ) DVDinput_close( dvd->dev );
if( dvd->path_root ) free( dvd->path_root );
free( dvd );
dvd = 0;
}
}
/**
* Open an unencrypted file on a DVD image file.
*/
static dvd_file_t *DVDOpenFileUDF( dvd_reader_t *dvd, char *filename )
{
uint32_t start, len;
dvd_file_t *dvd_file;
start = UDFFindFile( dvd, filename, &len );
if( !start ) return 0;
dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
if( !dvd_file ) return 0;
dvd_file->dvd = dvd;
dvd_file->lb_start = start;
dvd_file->seek_pos = 0;
memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
dvd_file->filesize = len / DVD_VIDEO_LB_LEN;
return dvd_file;
}
/**
* Searches for <file> in directory <path>, ignoring case.
* Returns 0 and full filename in <filename>.
* or -1 on file not found.
* or -2 on path not found.
*/
static int findDirFile( const char *path, const char *file, char *filename )
{
DIR *dir;
struct dirent *ent;
dir = opendir( path );
if( !dir ) return -2;
while( ( ent = readdir( dir ) ) != NULL ) {
if( !strcasecmp( ent->d_name, file ) ) {
sprintf( filename, "%s%s%s", path,
( ( path[ strlen( path ) - 1 ] == '/' ) ? "" : "/" ),
ent->d_name );
return 0;
}
}
return -1;
}
static int findDVDFile( dvd_reader_t *dvd, const char *file, char *filename )
{
char video_path[ PATH_MAX + 1 ];
const char *nodirfile;
int ret;
/* Strip off the directory for our search */
if( !strncasecmp( "/VIDEO_TS/", file, 10 ) ) {
nodirfile = &(file[ 10 ]);
} else {
nodirfile = file;
}
ret = findDirFile( dvd->path_root, nodirfile, filename );
if( ret < 0 ) {
/* Try also with adding the path, just in case. */
sprintf( video_path, "%s/VIDEO_TS/", dvd->path_root );
ret = findDirFile( video_path, nodirfile, filename );
if( ret < 0 ) {
/* Try with the path, but in lower case. */
sprintf( video_path, "%s/video_ts/", dvd->path_root );
ret = findDirFile( video_path, nodirfile, filename );
if( ret < 0 ) {
return 0;
}
}
}
return 1;
}
/**
* Open an unencrypted file from a DVD directory tree.
*/
static dvd_file_t *DVDOpenFilePath( dvd_reader_t *dvd, char *filename )
{
char full_path[ PATH_MAX + 1 ];
dvd_file_t *dvd_file;
struct stat fileinfo;
dvd_input_t dev;
/* Get the full path of the file. */
if( !findDVDFile( dvd, filename, full_path ) ) return 0;
dev = DVDinput_open( full_path );
if( !dev ) return 0;
dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
if( !dvd_file ) return 0;
dvd_file->dvd = dvd;
dvd_file->lb_start = 0;
dvd_file->seek_pos = 0;
memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
dvd_file->filesize = 0;
if( stat( full_path, &fileinfo ) < 0 ) {
fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
free( dvd_file );
return 0;
}
dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
dvd_file->title_devs[ 0 ] = dev;
dvd_file->filesize = dvd_file->title_sizes[ 0 ];
return dvd_file;
}
static dvd_file_t *DVDOpenVOBUDF( dvd_reader_t *dvd, int title, int menu )
{
char filename[ MAX_UDF_FILE_NAME_LEN ];
uint32_t start, len;
dvd_file_t *dvd_file;
if( title == 0 ) {
sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
} else {
sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, menu ? 0 : 1 );
}
start = UDFFindFile( dvd, filename, &len );
if( start == 0 ) return 0;
dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
if( !dvd_file ) return 0;
dvd_file->dvd = dvd;
/*Hack*/ dvd_file->css_title = title << 1 | menu;
dvd_file->lb_start = start;
dvd_file->seek_pos = 0;
memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
dvd_file->filesize = len / DVD_VIDEO_LB_LEN;
/* Calculate the complete file size for every file in the VOBS */
if( !menu ) {
int cur;
for( cur = 2; cur < 10; cur++ ) {
sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, cur );
if( !UDFFindFile( dvd, filename, &len ) ) break;
dvd_file->filesize += len / DVD_VIDEO_LB_LEN;
}
}
if( dvd->css_state == 1 /* Need key init */ ) {
// initAllCSSKeys( dvd );
// dvd->css_state = 2;
}
/*
if( DVDinput_seek( dvd_file->dvd->dev,
(int)start, DVDINPUT_SEEK_KEY ) < 0 ) {
fprintf( stderr, "libdvdread: Error cracking CSS key for %s\n",
filename );
}
*/
return dvd_file;
}
static dvd_file_t *DVDOpenVOBPath( dvd_reader_t *dvd, int title, int menu )
{
char filename[ MAX_UDF_FILE_NAME_LEN ];
char full_path[ PATH_MAX + 1 ];
struct stat fileinfo;
dvd_file_t *dvd_file;
int i;
dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
if( !dvd_file ) return 0;
dvd_file->dvd = dvd;
/*Hack*/ dvd_file->css_title = title << 1 | menu;
dvd_file->lb_start = 0;
dvd_file->seek_pos = 0;
memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
dvd_file->filesize = 0;
if( menu ) {
dvd_input_t dev;
if( title == 0 ) {
sprintf( filename, "VIDEO_TS.VOB" );
} else {
sprintf( filename, "VTS_%02i_0.VOB", title );
}
if( !findDVDFile( dvd, filename, full_path ) ) {
free( dvd_file );
return 0;
}
dev = DVDinput_open( full_path );
if( dev == NULL ) {
free( dvd_file );
return 0;
}
if( stat( full_path, &fileinfo ) < 0 ) {
fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
free( dvd_file );
return 0;
}
dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
dvd_file->title_devs[ 0 ] = dev;
DVDinput_seek( dvd_file->title_devs[0], 0, DVDINPUT_SEEK_KEY );
dvd_file->filesize = dvd_file->title_sizes[ 0 ];
} else {
for( i = 0; i < 9; ++i ) {
sprintf( filename, "VTS_%02i_%i.VOB", title, i + 1 );
if( !findDVDFile( dvd, filename, full_path ) ) {
break;
}
if( stat( full_path, &fileinfo ) < 0 ) {
fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
break;
}
dvd_file->title_sizes[ i ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
dvd_file->title_devs[ i ] = DVDinput_open( full_path );
dvd_file->filesize += dvd_file->title_sizes[ i ];
DVDinput_seek( dvd_file->title_devs[ i ], 0, DVDINPUT_SEEK_KEY );
}
if( !dvd_file->title_devs[ 0 ] ) {
free( dvd_file );
return 0;
}
}
return dvd_file;
}
dvd_file_t *DVDOpenFile( dvd_reader_t *dvd, int titlenum,
dvd_read_domain_t domain )
{
char filename[ MAX_UDF_FILE_NAME_LEN ];
switch( domain ) {
case DVD_READ_INFO_FILE:
if( titlenum == 0 ) {
sprintf( filename, "/VIDEO_TS/VIDEO_TS.IFO" );
} else {
sprintf( filename, "/VIDEO_TS/VTS_%02i_0.IFO", titlenum );
}
break;
case DVD_READ_INFO_BACKUP_FILE:
if( titlenum == 0 ) {
sprintf( filename, "/VIDEO_TS/VIDEO_TS.BUP" );
} else {
sprintf( filename, "/VIDEO_TS/VTS_%02i_0.BUP", titlenum );
}
break;
case DVD_READ_MENU_VOBS:
if( dvd->isImageFile ) {
return DVDOpenVOBUDF( dvd, titlenum, 1 );
} else {
return DVDOpenVOBPath( dvd, titlenum, 1 );
}
break;
case DVD_READ_TITLE_VOBS:
if( titlenum == 0 ) return 0;
if( dvd->isImageFile ) {
return DVDOpenVOBUDF( dvd, titlenum, 0 );
} else {
return DVDOpenVOBPath( dvd, titlenum, 0 );
}
break;
default:
fprintf( stderr, "libdvdread: Invalid domain for file open.\n" );
return 0;
}
if( dvd->isImageFile ) {
return DVDOpenFileUDF( dvd, filename );
} else {
return DVDOpenFilePath( dvd, filename );
}
}
void DVDCloseFile( dvd_file_t *dvd_file )
{
int i;
if( dvd_file ) {
if( dvd_file->dvd->isImageFile ) {
;
} else {
for( i = 0; i < 9; ++i ) {
if( dvd_file->title_devs[ i ] ) {
DVDinput_close( dvd_file->title_devs[i] );
}
}
}
free( dvd_file );
dvd_file = 0;
}
}
/* Internal, but used from dvd_udf.c */
int DVDReadBlocksUDFRaw( dvd_reader_t *device, uint32_t lb_number,
size_t block_count, unsigned char *data,
int encrypted )
{
int ret;
if( !device->dev ) {
fprintf( stderr, "libdvdread: Fatal error in block read.\n" );
return 0;
}
ret = DVDinput_seek( device->dev, (int) lb_number, DVDINPUT_NOFLAGS );
if( ret != (int) lb_number ) {
fprintf( stderr, "libdvdread: Can't seek to block %u\n", lb_number );
return 0;
}
return DVDinput_read( device->dev, (char *) data,
(int) block_count, encrypted );
}
/* This is using a single input and starting from 'dvd_file->lb_start' offset.
*
* Reads 'block_count' blocks from 'dvd_file' at block offset 'offset'
* into the buffer located at 'data' and if 'encrypted' is set
* descramble the data if it's encrypted. Returning either an
* negative error or the number of blocks read. */
static int DVDReadBlocksUDF( dvd_file_t *dvd_file, uint32_t offset,
size_t block_count, unsigned char *data,
int encrypted )
{
return DVDReadBlocksUDFRaw( dvd_file->dvd, dvd_file->lb_start + offset,
block_count, data, encrypted );
}
/* This is using possibly several inputs and starting from an offset of '0'.
*
* Reads 'block_count' blocks from 'dvd_file' at block offset 'offset'
* into the buffer located at 'data' and if 'encrypted' is set
* descramble the data if it's encrypted. Returning either an
* negative error or the number of blocks read. */
static int DVDReadBlocksPath( dvd_file_t *dvd_file, unsigned int offset,
size_t block_count, unsigned char *data,
int encrypted )
{
int i;
int ret, ret2, off;
ret = 0;
ret2 = 0;
for( i = 0; i < 9; ++i ) {
if( !dvd_file->title_sizes[ i ] ) return 0; /* Past end of file */
if( offset < dvd_file->title_sizes[ i ] ) {
if( ( offset + block_count ) <= dvd_file->title_sizes[ i ] ) {
off = DVDinput_seek( dvd_file->title_devs[ i ],
(int)offset, DVDINPUT_NOFLAGS );
if( off < 0 || off != (int)offset ) {
fprintf( stderr, "libdvdread: Can't seek to block %d\n",
offset );
return off < 0 ? off : 0;
}
ret = DVDinput_read( dvd_file->title_devs[ i ], data,
(int)block_count, encrypted );
break;
} else {
size_t part1_size = dvd_file->title_sizes[ i ] - offset;
/* FIXME: Really needs to be a while loop.
* (This is only true if you try and read >1GB at a time) */
/* Read part 1 */
off = DVDinput_seek( dvd_file->title_devs[ i ],
(int)offset, DVDINPUT_NOFLAGS );
if( off < 0 || off != (int)offset ) {
fprintf( stderr, "libdvdread: Can't seek to block %d\n",
offset );
return off < 0 ? off : 0;
}
ret = DVDinput_read( dvd_file->title_devs[ i ], data,
(int)part1_size, encrypted );
if( ret < 0 ) return ret;
/* FIXME: This is wrong if i is the last file in the set.
* also error from this read will not show in ret. */
/* Does the next part exist? If not then return now. */
if( !dvd_file->title_devs[ i + 1 ] ) return ret;
/* Read part 2 */
off = DVDinput_seek( dvd_file->title_devs[ i + 1 ],
0, DVDINPUT_NOFLAGS );
if( off < 0 || off != 0 ) {
fprintf( stderr, "libdvdread: Can't seek to block %d\n",
0 );
return off < 0 ? off : 0;
}
ret2 = DVDinput_read( dvd_file->title_devs[ i + 1 ],
data + ( part1_size
* (int64_t)DVD_VIDEO_LB_LEN ),
(int)(block_count - part1_size),
encrypted );
if( ret2 < 0 ) return ret2;
break;
}
} else {
offset -= dvd_file->title_sizes[ i ];
}
}
return ret + ret2;
}
/* This is broken reading more than 2Gb at a time is ssize_t is 32-bit. */
ssize_t DVDReadBlocks( dvd_file_t *dvd_file, int offset,
size_t block_count, unsigned char *data )
{
int ret;
/* Hack, and it will still fail for multiple opens in a threaded app ! */
if( dvd_file->dvd->css_title != dvd_file->css_title ) {
dvd_file->dvd->css_title = dvd_file->css_title;
if( dvd_file->dvd->isImageFile ) {
DVDinput_title( dvd_file->dvd->dev, (int)dvd_file->lb_start );
} else {
DVDinput_title( dvd_file->title_devs[ 0 ], (int)dvd_file->lb_start );
}
}
if( dvd_file->dvd->isImageFile ) {
ret = DVDReadBlocksUDF( dvd_file, (uint32_t)offset,
block_count, data, DVDINPUT_READ_DECRYPT );
} else {
ret = DVDReadBlocksPath( dvd_file, (unsigned int)offset,
block_count, data, DVDINPUT_READ_DECRYPT );
}
return (ssize_t)ret;
}
int DVDFileSeek( dvd_file_t *dvd_file, int offset )
{
if( offset > dvd_file->filesize * DVD_VIDEO_LB_LEN ) {
return -1;
}
dvd_file->seek_pos = (uint32_t) offset;
return offset;
}
ssize_t DVDReadBytes( dvd_file_t *dvd_file, void *data, size_t byte_size )
{
unsigned char *secbuf;
unsigned int numsec, seek_sector, seek_byte;
int ret;
seek_sector = dvd_file->seek_pos / DVD_VIDEO_LB_LEN;
seek_byte = dvd_file->seek_pos % DVD_VIDEO_LB_LEN;
numsec = ( ( seek_byte + byte_size ) / DVD_VIDEO_LB_LEN ) + 1;
secbuf = (unsigned char *) malloc( numsec * DVD_VIDEO_LB_LEN );
if( !secbuf ) {
fprintf( stderr, "libdvdread: Can't allocate memory "
"for file read!\n" );
return 0;
}
if( dvd_file->dvd->isImageFile ) {
ret = DVDReadBlocksUDF( dvd_file, (uint32_t) seek_sector,
(size_t) numsec, secbuf, DVDINPUT_NOFLAGS );
} else {
ret = DVDReadBlocksPath( dvd_file, seek_sector,
(size_t) numsec, secbuf, DVDINPUT_NOFLAGS );
}
if( ret != (int) numsec ) {
free( secbuf );
return ret < 0 ? ret : 0;
}
memcpy( data, &(secbuf[ seek_byte ]), byte_size );
free( secbuf );
dvd_file->seek_pos += byte_size;
return byte_size;
}
ssize_t DVDFileSize( dvd_file_t *dvd_file )
{
return dvd_file->filesize;
}
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