dvd_reader.c 39.5 KB
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/*
 * Copyright (C) 2001-2004 Billy Biggs <vektor@dumbterm.net>,
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 *                         Håkan Hjort <d95hjort@dtek.chalmers.se>,
 *                         Björn Englund <d4bjorn@dtek.chalmers.se>
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 *
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 * This file is part of libdvdread.
 *
 * libdvdread is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
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 *
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 * libdvdread 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.
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 *
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 * You should have received a copy of the GNU General Public License along
 * with libdvdread; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

#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>
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#include <ctype.h>
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#include <unistd.h>
#include <limits.h>
#include <dirent.h>

/* misc win32 helpers */
#ifdef WIN32
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#ifndef HAVE_GETTIMEOFDAY
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/* replacement gettimeofday implementation */
#include <sys/timeb.h>
static inline int _private_gettimeofday( struct timeval *tv, void *tz )
{
  struct timeb t;
  ftime( &t );
  tv->tv_sec = t.time;
  tv->tv_usec = t.millitm * 1000;
  return 0;
}
#define gettimeofday(TV, TZ) _private_gettimeofday((TV), (TZ))
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#endif
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#include <io.h> /* read() */
#define lseek64 _lseeki64
#endif
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#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__bsdi__) || defined(__APPLE__)
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#define SYS_BSD 1
#endif

#if defined(__sun)
#include <sys/mnttab.h>
#elif defined(SYS_BSD)
#include <fstab.h>
#elif defined(__linux__)
#include <mntent.h>
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#include <paths.h>
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#endif

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#include "dvdread/dvd_udf.h"
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#include "dvd_input.h"
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#include "dvdread/dvd_reader.h"
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#include "md5.h"

#define DEFAULT_UDF_CACHE_LEVEL 1

struct dvd_reader_s {
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  /* Basic information. */
  int isImageFile;
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  /* 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. */
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  /* Information required for an image file. */
  dvd_input_t dev;
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  /* Information required for a directory path drive. */
  char *path_root;
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  /* Filesystem cache */
  int udfcache_level; /* 0 - turned off, 1 - on */
  void *udfcache;
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};

#define TITLES_MAX 9

struct dvd_file_s {
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  /* Basic information. */
  dvd_reader_t *dvd;
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  /* Hack for selecting the right css title. */
  int css_title;
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  /* Information required for an image file. */
  uint32_t lb_start;
  uint32_t seek_pos;
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  /* Information required for a directory path drive. */
  size_t title_sizes[ TITLES_MAX ];
  dvd_input_t title_devs[ TITLES_MAX ];
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  /* Calculated at open-time, size in blocks. */
  ssize_t filesize;
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};

int UDFReadBlocksRaw( dvd_reader_t *device, uint32_t lb_number,
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                      size_t block_count, unsigned char *data,
                      int encrypted );
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/**
 * Set the level of caching on udf
 * level = 0 (no caching)
 * level = 1 (caching filesystem info)
 */
int DVDUDFCacheLevel(dvd_reader_t *device, int level)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;
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  if(level > 0) {
    level = 1;
  } else if(level < 0) {
    return dev->udfcache_level;
  }

  dev->udfcache_level = level;
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  return level;
}

void *GetUDFCacheHandle(dvd_reader_t *device)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;
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  return dev->udfcache;
}

void SetUDFCacheHandle(dvd_reader_t *device, void *cache)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;

  dev->udfcache = cache;
}



/* Loop over all titles and call dvdcss_title to crack the keys. */
static int initAllCSSKeys( dvd_reader_t *dvd )
{
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  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;

  char *nokeys_str = getenv("DVDREAD_NOKEYS");
  if(nokeys_str != NULL)
    return 0;
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  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);
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  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 );
    }
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    if( title == 0 ) continue;
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    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;
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    /* 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);
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    }
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    gettimeofday( &t_e, NULL );
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    fprintf( stderr, "libdvdread: Elapsed time %ld\n",
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             (long int) t_e.tv_sec - t_s.tv_sec );
  }
  title--;
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  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;
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}



/**
 * Open a DVD image or block device file.
 */
static dvd_reader_t *DVDOpenImageFile( const char *location, int have_css )
{
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  dvd_reader_t *dvd;
  dvd_input_t dev;
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  dev = dvdinput_open( location );
  if( !dev ) {
    fprintf( stderr, "libdvdread: Can't open %s for reading\n", location );
    return NULL;
  }
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  dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
  if( !dvd ) {
    dvdinput_close(dev);
    return NULL;
  }
  dvd->isImageFile = 1;
  dvd->dev = dev;
  dvd->path_root = NULL;
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  dvd->udfcache_level = DEFAULT_UDF_CACHE_LEVEL;
  dvd->udfcache = NULL;
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  if( have_css ) {
    /* Only if DVDCSS_METHOD = title, a bit if it's disc or if
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     * DVDCSS_METHOD = key but region mismatch. Unfortunately we
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     * don't have that information. */
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    dvd->css_state = 1; /* Need key init. */
  }
  dvd->css_title = 0;
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  return dvd;
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}

static dvd_reader_t *DVDOpenPath( const char *path_root )
{
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  dvd_reader_t *dvd;

  dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
  if( !dvd ) return NULL;
  dvd->isImageFile = 0;
  dvd->dev = 0;
  dvd->path_root = strdup( path_root );
  if(!dvd->path_root) {
    free(dvd);
    return 0;
  }
  dvd->udfcache_level = DEFAULT_UDF_CACHE_LEVEL;
  dvd->udfcache = NULL;
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  dvd->css_state = 0; /* Only used in the UDF path */
  dvd->css_title = 0; /* Only matters in the UDF path */
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  return dvd;
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}

#if defined(__sun)
/* /dev/rdsk/c0t6d0s0 (link to /devices/...)
   /vol/dev/rdsk/c0t6d0/??
   /vol/rdsk/<name> */
static char *sun_block2char( const char *path )
{
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  char *new_path;
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  /* Must contain "/dsk/" */
  if( !strstr( path, "/dsk/" ) ) return (char *) strdup( path );
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  /* 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/" ) );
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  return new_path;
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}
#endif

#if defined(SYS_BSD)
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/* FreeBSD /dev/(r)(a)cd0c (a is for atapi), recommended to _not_ use r
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   update: FreeBSD and DragonFly no longer uses the prefix so don't add it.
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   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
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   BSD/OS  /dev/sr0c (if not mounted) or /dev/rsr0c ('c' any letter will do)
   returns a string allocated with strdup. It should be freed when no longer
   used. */
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static char *bsd_block2char( const char *path )
{
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#if defined(__FreeBSD__) || defined(__DragonFly__)
  return (char *) strdup( path );
#else
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  char *new_path;
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  /* If it doesn't start with "/dev/" or does start with "/dev/r" exit */
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  if( strncmp( path, "/dev/",  5 ) || !strncmp( path, "/dev/r", 6 ) )
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    return (char *) strdup( path );
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  /* Replace "/dev/" with "/dev/r" */
  new_path = malloc( strlen(path) + 2 );
  strcpy( new_path, "/dev/r" );
  strcat( new_path, path + strlen( "/dev/" ) );
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  return new_path;
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#endif /* __FreeBSD__ || __DragonFly__ */
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}
#endif

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dvd_reader_t *DVDOpen( const char *ppath )
{
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  struct stat fileinfo;
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  int ret, have_css, retval, cdir = -1;
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  dvd_reader_t *ret_val = NULL;
  char *dev_name = NULL;
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  char *path = NULL, *new_path = NULL, *path_copy = NULL;
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#if defined(_WIN32) || defined(__OS2__)
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      int len;
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#endif

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  if( ppath == NULL )
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    goto DVDOpen_error;
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      path = strdup(ppath);
  if( path == NULL )
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    goto DVDOpen_error;
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  /* Try to open libdvdcss or fall back to standard functions */
  have_css = dvdinput_setup();
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#if defined(_WIN32) || defined(__OS2__)
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  /* Strip off the trailing \ if it is not a drive */
  len = strlen(path);
  if ((len > 1) &&
      (path[len - 1] == '\\')  &&
      (path[len - 2] != ':'))
  {
    path[len-1] = '\0';
  }
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#endif
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  ret = stat( path, &fileinfo );
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  if( ret < 0 ) {
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    /* maybe "host:port" url? try opening it with acCeSS library */
    if( strchr(path,':') ) {
                    ret_val = DVDOpenImageFile( path, have_css );
                    free(path);
            return ret_val;
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    }

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    /* If we can't stat the file, give up */
    fprintf( stderr, "libdvdread: Can't stat %s\n", path );
    perror("");
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    goto DVDOpen_error;
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  }

  /* 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 ) ) {
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    /**
     * Block devices and regular files are assumed to be DVD-Video images.
     */
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    dvd_reader_t *dvd = NULL;
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#if defined(__sun)
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    dev_name = sun_block2char( path );
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#elif defined(SYS_BSD)
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    dev_name = bsd_block2char( path );
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#else
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    dev_name = strdup( path );
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#endif
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    dvd = DVDOpenImageFile( dev_name, have_css );
    free( dev_name );
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    free(path);
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    return dvd;
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  } else if( S_ISDIR( fileinfo.st_mode ) ) {
    dvd_reader_t *auth_drive = 0;
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#if defined(SYS_BSD)
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    struct fstab* fe;
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#elif defined(__sun) || defined(__linux__)
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    FILE *mntfile;
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#endif

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    /* XXX: We should scream real loud here. */
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    if( !(path_copy = strdup( path ) ) )
      goto DVDOpen_error;
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#ifndef WIN32 /* don't have fchdir, and getcwd( NULL, ... ) is strange */
              /* Also WIN32 does not have symlinks, so we don't need this bit of code. */

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    /* Resolve any symlinks and get the absolute dir name. */
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    {
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      if( ( cdir  = open( ".", O_RDONLY ) ) >= 0 ) {
        if( chdir( path_copy ) == -1 ) {
          goto DVDOpen_error;
        }
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        new_path = malloc(PATH_MAX+1);
        if(!new_path) {
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          goto DVDOpen_error;
        }
        if( getcwd( new_path, PATH_MAX ) == NULL ) {
          goto DVDOpen_error;
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        }
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        retval = fchdir( cdir );
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        close( cdir );
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        cdir = -1;
        if( retval == -1 ) {
          goto DVDOpen_error;
        }
        path_copy = new_path;
        new_path = NULL;
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      }
    }
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#endif
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    /**
     * If we're being asked to open a directory, check if that directory
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     * is the mount point for a DVD-ROM which we can use instead.
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     */
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    if( strlen( path_copy ) > 1 ) {
      if( path_copy[ strlen( path_copy ) - 1 ] == '/' ) {
        path_copy[ strlen( path_copy ) - 1 ] = '\0';
      }
    }

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#if defined(_WIN32) || defined(__OS2__)
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    if(strlen(path_copy) > TITLES_MAX) {
      if(!strcasecmp(&(path_copy[strlen( path_copy ) - TITLES_MAX]),
                       "\\video_ts"))
        path_copy[strlen(path_copy) - (TITLES_MAX-1)] = '\0';
    }
#endif
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    if( strlen( path_copy ) > TITLES_MAX ) {
      if( !strcasecmp( &(path_copy[ strlen( path_copy ) - TITLES_MAX ]),
                       "/video_ts" ) ) {
        path_copy[ strlen( path_copy ) - TITLES_MAX ] = '\0';
      }
    }

    if(path_copy[0] == '\0') {
      path_copy[0] = '/';
      path_copy[1] = '\0';
    }
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#if defined(SYS_BSD)
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    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 );
    }
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#elif defined(__sun)
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    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;
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        }
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      }
      fclose( mntfile );
    }
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#elif defined(__linux__)
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    mntfile = fopen( _PATH_MOUNTED, "r" );
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    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;
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        }
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      }
      fclose( mntfile );
    }
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#elif defined(_WIN32) || defined(__OS2__)
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#ifdef __OS2__
    /* Use DVDOpenImageFile() only if it is a drive */
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    if(isalpha(path[0]) && path[1] == ':' &&
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        ( !path[2] ||
          ((path[2] == '\\' || path[2] == '/') && !path[3])))
#endif
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    auth_drive = DVDOpenImageFile( path, have_css );
#endif

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#if !defined(_WIN32) && !defined(__OS2__)
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    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 );
    }
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#else
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    if( !auth_drive ) {
        fprintf( stderr, "libdvdread: Device %s inaccessible, "
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                 "CSS authentication not available.\n", path );
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    }
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#endif

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    free( dev_name );
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    dev_name = NULL;
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    free( path_copy );
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    path_copy = NULL;
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    /**
     * If we've opened a drive, just use that.
     */
    if( auth_drive ) {
      free(path);
      return auth_drive;
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    }
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    /**
     * Otherwise, we now try to open the directory tree instead.
     */
    ret_val = DVDOpenPath( path );
      free( path );
      return ret_val;
  }
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DVDOpen_error:
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  /* If it's none of the above, screw it. */
  fprintf( stderr, "libdvdread: Could not open %s\n", path );
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  if( path != NULL )
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    free( path );
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  if ( path_copy != NULL )
    free( path_copy );
  if ( cdir >= 0 )
    close( cdir );
  if ( new_path != NULL )
    free( new_path );
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  return NULL;
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}

void DVDClose( dvd_reader_t *dvd )
{
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  if( dvd ) {
    if( dvd->dev ) dvdinput_close( dvd->dev );
    if( dvd->path_root ) free( dvd->path_root );
    if( dvd->udfcache ) FreeUDFCache( dvd->udfcache );
    free( dvd );
  }
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}

/**
 * Open an unencrypted file on a DVD image file.
 */
static dvd_file_t *DVDOpenFileUDF( dvd_reader_t *dvd, char *filename )
{
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  uint32_t start, len;
  dvd_file_t *dvd_file;
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  start = UDFFindFile( dvd, filename, &len );
  if( !start ) {
    fprintf( stderr, "libdvdnav:DVDOpenFileUDF:UDFFindFile %s failed\n", filename );
    return NULL;
  }
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  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) {
    fprintf( stderr, "libdvdnav:DVDOpenFileUDF:malloc failed\n" );
    return NULL;
  }
  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;
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}

/**
 * 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.
 */
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static int findDirFile( const char *path, const char *file, char *filename )
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{
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  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 );
      closedir(dir);
      return 0;
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    }
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  }
  closedir(dir);
  return -1;
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}

static int findDVDFile( dvd_reader_t *dvd, const char *file, char *filename )
{
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  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;
  }
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  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 );
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    if( ret < 0 ) {
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      /* 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;
      }
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    }
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  }
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  return 1;
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}

/**
 * Open an unencrypted file from a DVD directory tree.
 */
static dvd_file_t *DVDOpenFilePath( dvd_reader_t *dvd, char *filename )
{
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  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 ) ) {
    fprintf( stderr, "libdvdnav:DVDOpenFilePath:findDVDFile %s failed\n", filename );
    return NULL;
  }
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  dev = dvdinput_open( full_path );
  if( !dev ) {
    fprintf( stderr, "libdvdnav:DVDOpenFilePath:dvdinput_open %s failed\n", full_path );
    return NULL;
  }
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  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) {
    fprintf( stderr, "libdvdnav:DVDOpenFilePath:dvd_file malloc failed\n" );
    dvdinput_close(dev);
    return NULL;
  }
  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 NULL;
  }
  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 ];
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  return dvd_file;
}
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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 NULL;

  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) return NULL;
  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;
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    }
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  }

  if( dvd->css_state == 1 /* Need key init */ ) {
    initAllCSSKeys( dvd );
    dvd->css_state = 2;
  }
  /*
  if( dvdinput_title( dvd_file->dvd->dev, (int)start ) < 0 ) {
      fprintf( stderr, "libdvdread: Error cracking CSS key for %s\n",
               filename );
  }
  */
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  return dvd_file;
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}

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static dvd_file_t *DVDOpenVOBPath( dvd_reader_t *dvd, int title, int menu )
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{
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  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 NULL;
  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;
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    if( title == 0 ) {
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      sprintf( filename, "VIDEO_TS.VOB" );
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    } else {
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      sprintf( filename, "VTS_%02i_0.VOB", title );
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    }
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    if( !findDVDFile( dvd, filename, full_path ) ) {
      free( dvd_file );
      return NULL;
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    }
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    dev = dvdinput_open( full_path );
    if( dev == NULL ) {
      free( dvd_file );
      return NULL;
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    }
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    if( stat( full_path, &fileinfo ) < 0 ) {
      fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
      dvdinput_close(dev);
      free( dvd_file );
      return NULL;
    }
    dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
    dvd_file->title_devs[ 0 ] = dev;
    dvdinput_title( dvd_file->title_devs[0], 0);
    dvd_file->filesize = dvd_file->title_sizes[ 0 ];
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  } else {
    for( i = 0; i < TITLES_MAX; ++i ) {
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      sprintf( filename, "VTS_%02i_%i.VOB", title, i + 1 );
      if( !findDVDFile( dvd, filename, full_path ) ) {
        break;
      }
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      if( stat( full_path, &fileinfo ) < 0 ) {
        fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
        break;
      }
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      dvd_file->title_sizes[ i ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
      dvd_file->title_devs[ i ] = dvdinput_open( full_path );
      dvdinput_title( dvd_file->title_devs[ i ], 0 );
      dvd_file->filesize += dvd_file->title_sizes[ i ];
    }
    if( !dvd_file->title_devs[ 0 ] ) {
      free( dvd_file );
      return NULL;
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    }
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  }
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  return dvd_file;
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}

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dvd_file_t *DVDOpenFile( dvd_reader_t *dvd, int titlenum,
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                         dvd_read_domain_t domain )
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{
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  char filename[ MAX_UDF_FILE_NAME_LEN ];
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  /* Check arguments. */
  if( dvd == NULL || titlenum < 0 )
    return NULL;
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  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 );
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    }
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    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:
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    if( dvd->isImageFile ) {
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      return DVDOpenVOBUDF( dvd, titlenum, 1 );
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    } else {
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      return DVDOpenVOBPath( dvd, titlenum, 1 );
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    }
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    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 NULL;
  }

  if( dvd->isImageFile ) {
    return DVDOpenFileUDF( dvd, filename );
  } else {
    return DVDOpenFilePath( dvd, filename );
  }
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}

void DVDCloseFile( dvd_file_t *dvd_file )
{
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  int i;
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  if( dvd_file ) {
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Erik Hovland committed
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    if( !dvd_file->dvd->isImageFile ) {
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      for( i = 0; i < TITLES_MAX; ++i ) {
        if( dvd_file->title_devs[ i ] ) {
          dvdinput_close( dvd_file->title_devs[i] );
        }
      }
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    }
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    free( dvd_file );
    dvd_file = 0;
  }
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}

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static int DVDFileStatVOBUDF( dvd_reader_t *dvd, int title,
                              int menu, dvd_stat_t *statbuf )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  uint32_t size;
  off_t tot_size;
  off_t parts_size[ 9 ];
  int nr_parts = 0;
  int n;

  if( title == 0 )
    sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
  else
    sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, menu ? 0 : 1 );

  if( !UDFFindFile( dvd, filename, &size ) )
    return -1;

  tot_size = size;
  nr_parts = 1;
  parts_size[ 0 ] = size;

  if( !menu ) {
    int cur;

    for( cur = 2; cur < 10; cur++ ) {
      sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, cur );
      if( !UDFFindFile( dvd, filename, &size ) )
        break;

      parts_size[ nr_parts ] = size;
      tot_size += size;
      nr_parts++;
    }
  }

  statbuf->size = tot_size;
  statbuf->nr_parts = nr_parts;
  for( n = 0; n < nr_parts; n++ )
    statbuf->parts_size[ n ] = parts_size[ n ];

  return 0;
}


static int DVDFileStatVOBPath( dvd_reader_t *dvd, int title,
                               int menu, dvd_stat_t *statbuf )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  char full_path[ PATH_MAX + 1 ];
  struct stat fileinfo;
  off_t tot_size;
  off_t parts_size[ 9 ];
  int nr_parts = 0;
  int n;

  if( title == 0 )
    sprintf( filename, "VIDEO_TS.VOB" );
  else
    sprintf( filename, "VTS_%02d_%d.VOB", title, menu ? 0 : 1 );

  if( !findDVDFile( dvd, filename, full_path ) )
    return -1;

  if( stat( full_path, &fileinfo ) < 0 ) {
    fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
    return -1;
  }

  tot_size = fileinfo.st_size;
  nr_parts = 1;
  parts_size[ 0 ] = fileinfo.st_size;

  if( !menu ) {
    int cur;
    for( cur = 2; cur < 10; cur++ ) {
      sprintf( filename, "VTS_%02d_%d.VOB", title, cur );
      if( !findDVDFile( dvd, filename, full_path ) )
        break;

      if( stat( full_path, &fileinfo ) < 0 ) {
        fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
        break;
      }

      parts_size[ nr_parts ] = fileinfo.st_size;
      tot_size += parts_size[ nr_parts ];
      nr_parts++;
    }
  }

  statbuf->size = tot_size;
  statbuf->nr_parts = nr_parts;
  for( n = 0; n < nr_parts; n++ )
    statbuf->parts_size[ n ] = parts_size[ n ];

  return 0;
}


int DVDFileStat( dvd_reader_t *dvd, int titlenum,
                 dvd_read_domain_t domain, dvd_stat_t *statbuf )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  char full_path[ PATH_MAX + 1 ];
  struct stat fileinfo;
  uint32_t size;

  /* Check arguments. */
  if( dvd == NULL || titlenum < 0 ) {
    errno = EINVAL;
    return -1;
  }

  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 DVDFileStatVOBUDF( dvd, titlenum, 1, statbuf );
    else
      return DVDFileStatVOBPath( dvd, titlenum, 1, statbuf );

    break;
  case DVD_READ_TITLE_VOBS:
    if( titlenum == 0 )
      return -1;

    if( dvd->isImageFile )
      return DVDFileStatVOBUDF( dvd, titlenum, 0, statbuf );
    else
      return DVDFileStatVOBPath( dvd, titlenum, 0, statbuf );

    break;
  default:
    fprintf( stderr, "libdvdread: Invalid domain for file stat.\n" );
    errno = EINVAL;
    return -1;
  }

  if( dvd->isImageFile ) {
    if( UDFFindFile( dvd, filename, &size ) ) {
      statbuf->size = size;
      statbuf->nr_parts = 1;
      statbuf->parts_size[ 0 ] = size;
      return 0;
    }
  } else {
    if( findDVDFile( dvd, filename, full_path ) ) {
      if( stat( full_path, &fileinfo ) < 0 )
        fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
      else {
        statbuf->size = fileinfo.st_size;
        statbuf->nr_parts = 1;
        statbuf->parts_size[ 0 ] = statbuf->size;
        return 0;
      }
    }
  }
  return -1;
}

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/* Internal, but used from dvd_udf.c */
int UDFReadBlocksRaw( dvd_reader_t *device, uint32_t lb_number,
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                      size_t block_count, unsigned char *data,
                      int encrypted )
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{
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  int ret;
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  if( !device->dev ) {
    fprintf( stderr, "libdvdread: Fatal error in block read.\n" );
    return 0;
  }

  ret = dvdinput_seek( device->dev, (int) lb_number );
  if( ret != (int) lb_number ) {
    fprintf( stderr, "libdvdread: Can't seek to block %u\n", lb_number );
    return 0;
  }
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  ret = dvdinput_read( device->dev, (char *) data,
                       (int) block_count, encrypted );
  return ret;
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}

/* 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,
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                             size_t block_count, unsigned char *data,
                             int encrypted )
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{
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  return UDFReadBlocksRaw( dvd_file->dvd, dvd_file->lb_start + offset,
                           block_count, data, encrypted );
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}

/* 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,
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                              size_t block_count, unsigned char *data,
                              int encrypted )
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{
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  int i;
  int ret, ret2, off;

  ret = 0;
  ret2 = 0;
  for( i = 0; i < TITLES_MAX; ++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 );
        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 );
        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( i + 1 >= TITLES_MAX || !dvd_file->title_devs[ i + 1 ] )
          return ret;

        /* Read part 2 */
        off = dvdinput_seek( dvd_file->title_devs[ i + 1 ], 0 );
        if( off < 0 || off != 0 ) {
          fprintf( stderr, "libdvdread: Can't seek to block %d\n",
                   0 );
          return off < 0 ? off : 0;
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        }
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        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 ];
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    }
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  }
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  return ret + ret2;
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}

/* This is broken reading more than 2Gb at a time is ssize_t is 32-bit. */
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ssize_t DVDReadBlocks( dvd_file_t *dvd_file, int offset,
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                       size_t block_count, unsigned char *data )
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{
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  int ret;
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  /* Check arguments. */
  if( dvd_file == NULL || offset < 0 || data == NULL )
    return -1;
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  /* 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;
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    if( dvd_file->dvd->isImageFile ) {
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      dvdinput_title( dvd_file->dvd->dev, (int)dvd_file->lb_start );
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    }
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    /* Here each vobu has it's own dvdcss handle, so no need to update
    else {
      dvdinput_title( dvd_file->title_devs[ 0 ], (int)dvd_file->lb_start );
    }*/
  }
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  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;
1237 1238 1239 1240
}

int32_t DVDFileSeek( dvd_file_t *dvd_file, int32_t offset )
{
1241 1242 1243
  /* Check arguments. */
  if( dvd_file == NULL || offset < 0 )
    return -1;
1244

1245 1246 1247 1248 1249
  if( offset > dvd_file->filesize * DVD_VIDEO_LB_LEN ) {
    return -1;
  }
  dvd_file->seek_pos = (uint32_t) offset;
  return offset;
1250 1251 1252 1253
}

int DVDFileSeekForce(dvd_file_t *dvd_file, int offset, int force_size)
{
1254 1255 1256
  /* Check arguments. */
  if( dvd_file == NULL || offset <= 0 )
      return -1;
1257

1258 1259 1260 1261 1262 1263
  if( dvd_file->dvd->isImageFile ) {
    if( force_size < 0 )
      force_size = (offset - 1) / DVD_VIDEO_LB_LEN + 1;
    if( dvd_file->filesize < force_size ) {
      dvd_file->filesize = force_size;
      fprintf(stderr, "libdvdread: Ignored size of file indicated in UDF.\n");
1264
    }
1265
  }
1266

1267 1268
  if( offset > dvd_file->filesize * DVD_VIDEO_LB_LEN )
    return -1;
1269

1270 1271
  dvd_file->seek_pos = (uint32_t) offset;
  return offset;
1272 1273 1274 1275
}

ssize_t DVDReadBytes( dvd_file_t *dvd_file, void *data, size_t byte_size )
{
1276 1277 1278
  unsigned char *secbuf_base, *secbuf;
  unsigned int numsec, seek_sector, seek_byte;
  int ret;
1279

1280 1281 1282
  /* Check arguments. */
  if( dvd_file == NULL || data == NULL )
    return -1;
1283

1284 1285
  seek_sector = dvd_file->seek_pos / DVD_VIDEO_LB_LEN;
  seek_byte   = dvd_file->seek_pos % DVD_VIDEO_LB_LEN;
1286

1287 1288
  numsec = ( ( seek_byte + byte_size ) / DVD_VIDEO_LB_LEN ) +
    ( ( ( seek_byte + byte_size ) % DVD_VIDEO_LB_LEN ) ? 1 : 0 );
1289

1290 1291 1292 1293 1294 1295 1296
  secbuf_base = (unsigned char *) malloc( numsec * DVD_VIDEO_LB_LEN + 2048 );
  secbuf = (unsigned char *)(((uintptr_t)secbuf_base & ~((uintptr_t)2047)) + 2048);
  if( !secbuf_base ) {
    fprintf( stderr, "libdvdread: Can't allocate memory "
             "for file read!\n" );
    return 0;
  }
1297

1298 1299 1300 1301 1302 1303 1304
  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 );
  }
1305

1306
  if( ret != (int) numsec ) {
1307
    free( secbuf_base );
1308 1309
    return ret < 0 ? ret : 0;
  }
1310

1311 1312 1313 1314 1315
  memcpy( data, &(secbuf[ seek_byte ]), byte_size );
  free( secbuf_base );

  DVDFileSeekForce(dvd_file, dvd_file->seek_pos + byte_size, -1);
  return byte_size;
1316 1317 1318 1319
}

ssize_t DVDFileSize( dvd_file_t *dvd_file )
{
1320 1321 1322
  /* Check arguments. */
  if( dvd_file == NULL )
    return -1;
1323

1324
  return dvd_file->filesize;
1325 1326 1327 1328
}

int DVDDiscID( dvd_reader_t *dvd, unsigned char *discid )
{
1329 1330 1331
  struct md5_ctx ctx;
  int title;
  int nr_of_files = 0;
1332

1333 1334 1335
  /* Check arguments. */
  if( dvd == NULL || discid == NULL )
    return 0;
1336

1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
  /* Go through the first 10 IFO:s, in order,
   * and md5sum them, i.e  VIDEO_TS.IFO and VTS_0?_0.IFO */
  md5_init_ctx( &ctx );
  for( title = 0; title < 10; title++ ) {
    dvd_file_t *dvd_file = DVDOpenFile( dvd, title, DVD_READ_INFO_FILE );
    if( dvd_file != NULL ) {
      ssize_t bytes_read;
      size_t file_size = dvd_file->filesize * DVD_VIDEO_LB_LEN;
      char *buffer_base = malloc( file_size + 2048 );
      char *buffer = (char *)(((uintptr_t)buffer_base & ~((uintptr_t)2047)) + 2048);

      if( buffer_base == NULL ) {
          DVDCloseFile( dvd_file );
          fprintf( stderr, "libdvdread: DVDDiscId, failed to "
                   "allocate memory for file read!\n" );
          return -1;
      }

      bytes_read = DVDReadBytes( dvd_file, buffer, file_size );
      if( bytes_read != file_size ) {
          fprintf( stderr, "libdvdread: DVDDiscId read returned %zd bytes"
                   ", wanted %zd\n", bytes_read, file_size );
          DVDCloseFile( dvd_file );
          free( buffer_base );
          return -1;
      }

      md5_process_bytes( buffer, file_size,  &ctx );

      DVDCloseFile( dvd_file );
      free( buffer_base );
      nr_of_files++;
1369
    }
1370 1371 1372 1373
  }
  md5_finish_ctx( &ctx, discid );
  if(!nr_of_files)
    return -1;
1374

1375
  return 0;
1376 1377 1378 1379
}


int DVDISOVolumeInfo( dvd_reader_t *dvd,
1380 1381
                      char *volid, unsigned int volid_size,
                      unsigned char *volsetid, unsigned int volsetid_size )
1382 1383 1384 1385 1386 1387 1388
{
  unsigned char *buffer, *buffer_base;
  int ret;

  /* Check arguments. */
  if( dvd == NULL )
    return 0;
1389

1390 1391 1392 1393
  if( dvd->dev == NULL ) {
    /* No block access, so no ISO... */
    return -1;
  }
1394

1395 1396 1397 1398 1399
  buffer_base = malloc( DVD_VIDEO_LB_LEN + 2048 );
  buffer = (unsigned char *)(((uintptr_t)buffer_base & ~((uintptr_t)2047)) + 2048);

  if( buffer_base == NULL ) {
    fprintf( stderr, "libdvdread: DVDISOVolumeInfo, failed to "
1400
             "allocate memory for file read!\n" );
1401 1402 1403 1404 1405 1406
    return -1;
  }

  ret = UDFReadBlocksRaw( dvd, 16, 1, buffer, 0 );
  if( ret != 1 ) {
    fprintf( stderr, "libdvdread: DVDISOVolumeInfo, failed to "
1407
             "read ISO9660 Primary Volume Descriptor!\n" );
1408 1409 1410
    free( buffer_base );
    return -1;
  }
1411