dvd_reader.c

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/* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 * Copyright (C) 2001, 2002, 2003 Billy Biggs <[e-mail]>,
 *                                H錵an Hjort <[e-mail]>,
 *                                Bj鰎n Englund <[e-mail]>
 *
 * Modified for use with MPlayer, changes contained in libdvdread_changes.diff.
 * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
 * $Id: dvd_reader.c,v 1.2 2008/03/03 08:11:34 dsqiu Exp $
 *
 * 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 <mplaylib.h>
#include <mplaylib.h>
#include <errno.h>
#include <mplaylib.h>
#include <mplaylib.h>

#include <dirent.h>
 
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__bsdi__) || defined(__DARWIN__) || defined(__DragonFly__)
#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__) || defined(__CYGWIN__)
#include <mntent.h>
#endif

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

#include "dvdread_internal.h"

#define DEFAULT_UDF_CACHE_LEVEL 0

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;
  
  /* Filesystem cache */
  int udfcache_level; /* 0 - turned off, 1 - on */
  void *udfcache;

  /* block aligned malloc */
  void *align;
  
  /* error message verbosity level */
  int verbose;
};

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;
};


#define DVDREAD_VERBOSE_DEFAULT 0

int get_verbose(void)
{
  char *dvdread_verbose;
  int verbose;
  
  dvdread_verbose = getenv("DVDREAD_VERBOSE");
  if(dvdread_verbose) {
    verbose = (int)strtol(dvdread_verbose, NULL, 0);
  } else {
    verbose = DVDREAD_VERBOSE_DEFAULT;
  }
  return verbose;
}

int dvdread_verbose(dvd_reader_t *dvd)
{
  return dvd->verbose;
}

dvd_reader_t *device_of_file(dvd_file_t *file)
{
  return file->dvd;
}

/**
 * Returns the compiled version. (DVDREAD_VERSION as an int)
 */
int DVDVersion(void)
{
  return DVDREAD_VERSION;
}


/**
 * 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;
  
  if(level > 0) {
    level = 1;
  } else if(level < 0) {
    return dev->udfcache_level;
  }

  dev->udfcache_level = level;
  
  return level;
}

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

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

  dev->udfcache = cache;
}

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

void SetAlignHandle(dvd_reader_t *device, void *align)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;

  dev->align = align;
}


/* 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;
        
  char *nokeys_str = getenv("DVDREAD_NOKEYS");
  if(nokeys_str != NULL)
    return 0;
    
  if(dvd->verbose >= 1) {
    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. */
      if(dvd->verbose >= 1) {
        fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n", 
                 filename, start );
      }
      if( dvdinput_title( dvd->dev, (int)start ) < 0 ) {
        if(dvd->verbose >= 0) {
          fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)\n", filename, start);
        }
      }
      gettimeofday( &t_e, NULL );
      if(dvd->verbose >= 1) {
        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. */
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n", 
               filename, start );
    }
    if( dvdinput_title( dvd->dev, (int)start ) < 0 ) {
      if(dvd->verbose >= 0) {
        fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)!!\n", filename, start);
      }
    }
    gettimeofday( &t_e, NULL );
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Elapsed time %ld\n",  
               (long int) t_e.tv_sec - t_s.tv_sec );
    }
  }
  title--;
    
  if(dvd->verbose >= 1) {
    fprintf( stderr, "libdvdread: Found %d VTS's\n", title );
  }
  gettimeofday(&all_e, NULL);
  if(dvd->verbose >= 1) {
    fprintf( stderr, "libdvdread: Elapsed time %ld\n",  
             (long int) all_e.tv_sec - all_s.tv_sec );
  }
  return 0;
}



/**
 * Open a DVD image or block device file.
 * Checks if the root directory in the udf image file can be found.
 * If not it assumes this isn't a valid udf image and returns NULL
 */
static dvd_reader_t *DVDOpenImageFile( const char *location, int have_css )
{
  dvd_reader_t *dvd;
  dvd_input_t dev;
  int verbose;

  verbose = get_verbose();

  dev = dvdinput_open( location );
  if( !dev ) {
    if(verbose >= 1) {
      fprintf( stderr, "libdvdread: Can't open '%s' for reading: %s\n",
               location, strerror(errno));
    }
    return NULL;
  }

  dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
  if( !dvd ) {
    int tmp_errno = errno;
    dvdinput_close(dev);
    errno = tmp_errno;
    return NULL;
  }
  dvd->verbose = verbose;
  dvd->isImageFile = 1;
  dvd->dev = dev;
  dvd->path_root = NULL;
    
  dvd->udfcache_level = DEFAULT_UDF_CACHE_LEVEL;
  dvd->udfcache = NULL;

  dvd->align = NULL;

  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. */
  }
  dvd->css_title = 0;
  
  /* sanity check, is it a valid UDF image, can we find the root dir */
  if(!UDFFindFile(dvd, "/", NULL)) {
    dvdinput_close(dvd->dev);
    if(dvd->udfcache) {
      FreeUDFCache(dvd, dvd->udfcache);
    }
    if(dvd->align) {
      if(dvd->verbose >= 0) {
        fprintf(stderr, "libdvdread: DVDOpenImageFile(): Memory leak in align functions 1\n");
      }
    }
    free(dvd);
    return NULL;
  }
  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 NULL;
  }
  dvd->verbose = get_verbose();
  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;

  dvd->align = NULL;

  dvd->css_state = 0; /* Only used in the UDF path */
  dvd->css_title = 0; /* Only matters in the UDF path */

  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
   update: FreeBSD and DragonFly no longer uses the prefix so don't add it.

   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)
   
   returns a string allocated with strdup which should be free()'d when
   no longer used.
*/
static char *bsd_block2char( const char *path )
{
#if defined(__FreeBSD__) || defined(__DragonFly__)
  return (char *) strdup( path );
#else
  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 /* __FreeBSD__ || __DragonFly__ */
}
#endif


dvd_reader_t *DVDOpen( const char *path )
{
  struct stat fileinfo;
  int ret, have_css;
  char *dev_name = NULL;
  int internal_errno = 0;
  int verbose;

  if( path == NULL ) {
    errno = EINVAL;
    return NULL;
  }
  
  verbose = get_verbose();

#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 ) {
        int tmp_errno = errno;
        /* If we can't stat the file, give up */
        if(verbose >= 1) {
          fprintf( stderr, "libdvdread: Can't stat '%s': %s\n",
                   path, strerror(errno));
        }
        errno = tmp_errno;
        return NULL;
      }
    }

  /* Try to open libdvdcss or fall back to standard functions */
  have_css = dvdinput_setup();

  /* 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.
     */
    dvd_reader_t *dvd = NULL;
#if defined(__sun)
    dev_name = sun_block2char( path );
#elif defined(SYS_BSD)
    dev_name = bsd_block2char( path );
#else
    dev_name = strdup( path );
#endif
    dvd = DVDOpenImageFile( dev_name, have_css );
    free( dev_name );
    
    return dvd;
  } 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__) || defined(__CYGWIN__)
    FILE *mntfile;
#endif

    /* XXX: We should scream real loud here. */
    if( !(path_copy = strdup( path ) ) ) return 0;

#ifndef WIN32 /* don't have fchdir, and getcwd( NULL, ... ) is strange */
    /* Resolve any symlinks and get the absolut dir name. */
    {
      char *new_path;
      char *current_path;

      current_path = malloc(PATH_MAX);
      if(current_path) {
        if(!getcwd(current_path, PATH_MAX)) {
          free(current_path);
          current_path = NULL;
        }
      }
      if(current_path) {
        chdir( path_copy );
        new_path = malloc(PATH_MAX);
        if(new_path) {
          if(!getcwd(new_path, PATH_MAX )) {
            free(new_path);
            new_path = NULL;
          }
        }

        chdir(current_path);
        free(current_path);
        if( new_path ) {
          free( path_copy );
          path_copy = new_path;
        }
      }
    }
#endif
        
    /**
     * 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';