ifo_read.c 66.9 KB
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/*
 * Copyright (C) 2000, 2001, 2002, 2003
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 *               Björn Englund <d4bjorn@dtek.chalmers.se>,
 *               Håkan Hjort <d95hjort@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
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
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 * libdvdread is distributed in the hope that it will be useful,
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 * 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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 * 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 "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>

#include "bswap.h"
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#include "dvdread/ifo_types.h"
#include "dvdread/ifo_read.h"
#include "dvdread/dvd_reader.h"
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#include "dvdread_internal.h"
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#include "dvdread/bitreader.h"
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#ifndef DVD_BLOCK_LEN
#define DVD_BLOCK_LEN 2048
#endif

#ifndef NDEBUG
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#define CHECK_ZERO0(arg)                                                \
  if(arg != 0) {                                                        \
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    fprintf(stderr, "*** Zero check failed in %s:%i\n    for %s = 0x%x\n", \
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            __FILE__, __LINE__, # arg, arg);                            \
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  }
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#define CHECK_ZERO(arg)                                                 \
  if(memcmp(my_friendly_zeros, &arg, sizeof(arg))) {                    \
    unsigned int i_CZ;                                                  \
    fprintf(stderr, "*** Zero check failed in %s:%i\n    for %s = 0x",  \
            __FILE__, __LINE__, # arg );                                \
    for(i_CZ = 0; i_CZ < sizeof(arg); i_CZ++)                           \
      fprintf(stderr, "%02x", *((uint8_t *)&arg + i_CZ));               \
    fprintf(stderr, "\n");                                              \
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  }
static const uint8_t my_friendly_zeros[2048];
#else
#define CHECK_ZERO0(arg) (void)(arg)
#define CHECK_ZERO(arg) (void)(arg)
#endif


/* Prototypes for internal functions */
static int ifoRead_VMG(ifo_handle_t *ifofile);
static int ifoRead_VTS(ifo_handle_t *ifofile);
static int ifoRead_PGC(ifo_handle_t *ifofile, pgc_t *pgc, unsigned int offset);
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static int ifoRead_PGC_COMMAND_TBL(ifo_handle_t *ifofile,
                                   pgc_command_tbl_t *cmd_tbl,
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                                   unsigned int offset);
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static int ifoRead_PGC_PROGRAM_MAP(ifo_handle_t *ifofile,
                                   pgc_program_map_t *program_map,
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                                   unsigned int nr, unsigned int offset);
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static int ifoRead_CELL_PLAYBACK_TBL(ifo_handle_t *ifofile,
                                     cell_playback_t *cell_playback,
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                                     unsigned int nr, unsigned int offset);
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static int ifoRead_CELL_POSITION_TBL(ifo_handle_t *ifofile,
                                     cell_position_t *cell_position,
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                                     unsigned int nr, unsigned int offset);
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static int ifoRead_VTS_ATTRIBUTES(ifo_handle_t *ifofile,
                                  vts_attributes_t *vts_attributes,
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                                  unsigned int offset);
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static int ifoRead_C_ADT_internal(ifo_handle_t *ifofile, c_adt_t *c_adt,
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                                  unsigned int sector);
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static int ifoRead_VOBU_ADMAP_internal(ifo_handle_t *ifofile,
                                       vobu_admap_t *vobu_admap,
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                                       unsigned int sector);
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static int ifoRead_PGCIT_internal(ifo_handle_t *ifofile, pgcit_t *pgcit,
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                                  unsigned int offset);

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static void ifoFree_PGC(pgc_t **pgc);
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static void ifoFree_PGC_COMMAND_TBL(pgc_command_tbl_t *cmd_tbl);
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static void ifoFree_PGCIT_internal(pgcit_t **pgcit);
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static inline int DVDFileSeekForce_( dvd_file_t *dvd_file, uint32_t offset, int force_size ) {
  return (DVDFileSeekForce(dvd_file, (int)offset, force_size) == (int)offset);
}

static inline int DVDFileSeek_( dvd_file_t *dvd_file, uint32_t offset ) {
  return (DVDFileSeek(dvd_file, (int)offset) == (int)offset);
}

static void read_video_attr(video_attr_t *va) {
  getbits_state_t state;
  uint8_t buf[sizeof(video_attr_t)];

  memcpy(buf, va, sizeof(video_attr_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  va->mpeg_version = dvdread_getbits(&state, 2);
  va->video_format = dvdread_getbits(&state, 2);
  va->display_aspect_ratio = dvdread_getbits(&state, 2);
  va->permitted_df = dvdread_getbits(&state, 2);
  va->line21_cc_1 = dvdread_getbits(&state, 1);
  va->line21_cc_2 = dvdread_getbits(&state, 1);
  va->unknown1 = dvdread_getbits(&state, 1);
  va->bit_rate = dvdread_getbits(&state, 1);
  va->picture_size = dvdread_getbits(&state, 2);
  va->letterboxed = dvdread_getbits(&state, 1);
  va->film_mode = dvdread_getbits(&state, 1);
}

static void read_audio_attr(audio_attr_t *aa) {
  getbits_state_t state;
  uint8_t buf[sizeof(audio_attr_t)];
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  memcpy(buf, aa, sizeof(audio_attr_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  aa->audio_format = dvdread_getbits(&state, 3);
  aa->multichannel_extension = dvdread_getbits(&state, 1);
  aa->lang_type = dvdread_getbits(&state, 2);
  aa->application_mode = dvdread_getbits(&state, 2);
  aa->quantization = dvdread_getbits(&state, 2);
  aa->sample_frequency = dvdread_getbits(&state, 2);
  aa->unknown1 = dvdread_getbits(&state, 1);
  aa->channels = dvdread_getbits(&state, 3);
  aa->lang_code = dvdread_getbits(&state, 16);
  aa->lang_extension = dvdread_getbits(&state, 8);
  aa->code_extension = dvdread_getbits(&state, 8);
  aa->unknown3 = dvdread_getbits(&state, 8);
  aa->app_info.karaoke.unknown4 = dvdread_getbits(&state, 1);
  aa->app_info.karaoke.channel_assignment = dvdread_getbits(&state, 3);
  aa->app_info.karaoke.version = dvdread_getbits(&state, 2);
  aa->app_info.karaoke.mc_intro = dvdread_getbits(&state, 1);
  aa->app_info.karaoke.mode = dvdread_getbits(&state, 1);
}

static void read_multichannel_ext(multichannel_ext_t *me) {
  getbits_state_t state;
  uint8_t buf[sizeof(multichannel_ext_t)];
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  memcpy(buf, me, sizeof(multichannel_ext_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  me->zero1 = dvdread_getbits(&state, 7);
  me->ach0_gme = dvdread_getbits(&state, 1);
  me->zero2 = dvdread_getbits(&state, 7);
  me->ach1_gme = dvdread_getbits(&state, 1);
  me->zero3 = dvdread_getbits(&state, 4);
  me->ach2_gv1e = dvdread_getbits(&state, 1);
  me->ach2_gv2e = dvdread_getbits(&state, 1);
  me->ach2_gm1e = dvdread_getbits(&state, 1);
  me->ach2_gm2e = dvdread_getbits(&state, 1);
  me->zero4 = dvdread_getbits(&state, 4);
  me->ach3_gv1e = dvdread_getbits(&state, 1);
  me->ach3_gv2e = dvdread_getbits(&state, 1);
  me->ach3_gmAe = dvdread_getbits(&state, 1);
  me->ach3_se2e = dvdread_getbits(&state, 1);
  me->zero5 = dvdread_getbits(&state, 4);
  me->ach4_gv1e = dvdread_getbits(&state, 1);
  me->ach4_gv2e = dvdread_getbits(&state, 1);
  me->ach4_gmBe = dvdread_getbits(&state, 1);
  me->ach4_seBe = dvdread_getbits(&state, 1);
}

static void read_subp_attr(subp_attr_t *sa) {
  getbits_state_t state;
  uint8_t buf[sizeof(subp_attr_t)];
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  memcpy(buf, sa, sizeof(subp_attr_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  sa->code_mode = dvdread_getbits(&state, 3);
  sa->zero1 = dvdread_getbits(&state, 3);
  sa->type = dvdread_getbits(&state, 2);
  sa->zero2 = dvdread_getbits(&state, 8);
  sa->lang_code = dvdread_getbits(&state, 16);
  sa->lang_extension = dvdread_getbits(&state, 8);
  sa->code_extension = dvdread_getbits(&state, 8);
}

static void read_user_ops(user_ops_t *uo) {
  getbits_state_t state;
  uint8_t buf[sizeof(user_ops_t)];
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  memcpy(buf, uo, sizeof(user_ops_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  uo->zero                           = dvdread_getbits(&state, 7);
  uo->video_pres_mode_change         = dvdread_getbits(&state, 1);
  uo->karaoke_audio_pres_mode_change = dvdread_getbits(&state, 1);
  uo->angle_change                   = dvdread_getbits(&state, 1);
  uo->subpic_stream_change           = dvdread_getbits(&state, 1);
  uo->audio_stream_change            = dvdread_getbits(&state, 1);
  uo->pause_on                       = dvdread_getbits(&state, 1);
  uo->still_off                      = dvdread_getbits(&state, 1);
  uo->button_select_or_activate      = dvdread_getbits(&state, 1);
  uo->resume                         = dvdread_getbits(&state, 1);
  uo->chapter_menu_call              = dvdread_getbits(&state, 1);
  uo->angle_menu_call                = dvdread_getbits(&state, 1);
  uo->audio_menu_call                = dvdread_getbits(&state, 1);
  uo->subpic_menu_call               = dvdread_getbits(&state, 1);
  uo->root_menu_call                 = dvdread_getbits(&state, 1);
  uo->title_menu_call                = dvdread_getbits(&state, 1);
  uo->backward_scan                  = dvdread_getbits(&state, 1);
  uo->forward_scan                   = dvdread_getbits(&state, 1);
  uo->next_pg_search                 = dvdread_getbits(&state, 1);
  uo->prev_or_top_pg_search          = dvdread_getbits(&state, 1);
  uo->time_or_chapter_search         = dvdread_getbits(&state, 1);
  uo->go_up                          = dvdread_getbits(&state, 1);
  uo->stop                           = dvdread_getbits(&state, 1);
  uo->title_play                     = dvdread_getbits(&state, 1);
  uo->chapter_search_or_play         = dvdread_getbits(&state, 1);
  uo->title_or_time_play             = dvdread_getbits(&state, 1);
}

static void read_pgci_srp(pgci_srp_t *ps) {
  getbits_state_t state;
  uint8_t buf[sizeof(pgci_srp_t)];
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  memcpy(buf, ps, sizeof(pgci_srp_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  ps->entry_id                       = dvdread_getbits(&state, 8);
  ps->block_mode                     = dvdread_getbits(&state, 2);
  ps->block_type                     = dvdread_getbits(&state, 2);
  ps->unknown1                       = dvdread_getbits(&state, 4);
  ps->ptl_id_mask                    = dvdread_getbits(&state, 16);
  ps->pgc_start_byte                 = dvdread_getbits(&state, 32);
}

static void read_cell_playback(cell_playback_t *cp) {
  getbits_state_t state;
  uint8_t buf[sizeof(cell_playback_t)];
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  memcpy(buf, cp, sizeof(cell_playback_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  cp->block_mode                      = dvdread_getbits(&state, 2);
  cp->block_type                      = dvdread_getbits(&state, 2);
  cp->seamless_play                   = dvdread_getbits(&state, 1);
  cp->interleaved                     = dvdread_getbits(&state, 1);
  cp->stc_discontinuity               = dvdread_getbits(&state, 1);
  cp->seamless_angle                  = dvdread_getbits(&state, 1);
  cp->playback_mode                   = dvdread_getbits(&state, 1);
  cp->restricted                      = dvdread_getbits(&state, 1);
  cp->unknown2                        = dvdread_getbits(&state, 6);
  cp->still_time                      = dvdread_getbits(&state, 8);
  cp->cell_cmd_nr                     = dvdread_getbits(&state, 8);
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  cp->playback_time.hour              = dvdread_getbits(&state, 8);
  cp->playback_time.minute            = dvdread_getbits(&state, 8);
  cp->playback_time.second            = dvdread_getbits(&state, 8);
  cp->playback_time.frame_u           = dvdread_getbits(&state, 8);
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  cp->first_sector                    = dvdread_getbits(&state, 32);
  cp->first_ilvu_end_sector           = dvdread_getbits(&state, 32);
  cp->last_vobu_start_sector          = dvdread_getbits(&state, 32);
  cp->last_sector                     = dvdread_getbits(&state, 32);
}

static void read_playback_type(playback_type_t *pt) {
  getbits_state_t state;
  uint8_t buf[sizeof(playback_type_t)];
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  memcpy(buf, pt, sizeof(playback_type_t));
  if (!dvdread_getbits_init(&state, buf)) abort();
  pt->zero_1                          = dvdread_getbits(&state, 1);
  pt->multi_or_random_pgc_title       = dvdread_getbits(&state, 1);
  pt->jlc_exists_in_cell_cmd          = dvdread_getbits(&state, 1);
  pt->jlc_exists_in_prepost_cmd       = dvdread_getbits(&state, 1);
  pt->jlc_exists_in_button_cmd        = dvdread_getbits(&state, 1);
  pt->jlc_exists_in_tt_dom            = dvdread_getbits(&state, 1);
  pt->chapter_search_or_play          = dvdread_getbits(&state, 1);
  pt->title_or_time_play              = dvdread_getbits(&state, 1);
}

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static void free_ptl_mait(ptl_mait_t* ptl_mait, int num_entries) {
  int i;
  for (i = 0; i < num_entries; i++)
    free(ptl_mait->countries[i].pf_ptl_mai);

  free(ptl_mait->countries);
  free(ptl_mait);
}

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ifo_handle_t *ifoOpen(dvd_reader_t *dvd, int title) {
  ifo_handle_t *ifofile;
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  int bup_file_opened = 0;
  char ifo_filename[13];
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  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return NULL;

  memset(ifofile, 0, sizeof(ifo_handle_t));

  ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_FILE);
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  if(!ifofile->file) { /* Failed to open IFO, try to open BUP */
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    ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_BACKUP_FILE);
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    bup_file_opened = 1;
  }

  if (title)
    snprintf(ifo_filename, 12, "VTS_%02d_0.%s", title, bup_file_opened ? "BUP" : "IFO");
  else
    snprintf(ifo_filename, 12, "VIDEO_TS.%s", bup_file_opened ? "BUP" : "IFO");

  ifo_filename[12] = '\0';

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  if(!ifofile->file) {
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    fprintf(stderr, "libdvdread: Can't open file %s.\n", ifo_filename);
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    free(ifofile);
    return NULL;
  }

  /* First check if this is a VMGI file. */
  if(ifoRead_VMG(ifofile)) {

    /* These are both mandatory. */
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    if(!ifoRead_FP_PGC(ifofile) || !ifoRead_TT_SRPT(ifofile))
      goto ifoOpen_try_bup;
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    ifoRead_PGCI_UT(ifofile);
    ifoRead_PTL_MAIT(ifofile);

    /* This is also mandatory. */
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    if(!ifoRead_VTS_ATRT(ifofile))
      goto ifoOpen_try_bup;
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    ifoRead_TXTDT_MGI(ifofile);
    ifoRead_C_ADT(ifofile);
    ifoRead_VOBU_ADMAP(ifofile);

    return ifofile;
  }

  if(ifoRead_VTS(ifofile)) {

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    if(!ifoRead_VTS_PTT_SRPT(ifofile) || !ifoRead_PGCIT(ifofile))
      goto ifoOpen_try_bup;
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    ifoRead_PGCI_UT(ifofile);
    ifoRead_VTS_TMAPT(ifofile);
    ifoRead_C_ADT(ifofile);
    ifoRead_VOBU_ADMAP(ifofile);

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    if(!ifoRead_TITLE_C_ADT(ifofile) || !ifoRead_TITLE_VOBU_ADMAP(ifofile))
      goto ifoOpen_try_bup;
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    return ifofile;
  }

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ifoOpen_try_bup:
  if (bup_file_opened)
    goto ifoOpen_fail;

  /* Try BUP instead */
  ifoClose(ifofile);

  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return NULL;

  memset(ifofile, 0, sizeof(ifo_handle_t));
  ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_BACKUP_FILE);

  if (title)
    snprintf(ifo_filename, 12, "VTS_%02d_0.BUP", title);
  else
    strncpy(ifo_filename, "VIDEO_TS.BUP", 12);

  if (!ifofile->file) {
    fprintf(stderr, "libdvdread: Can't open file %s.\n", ifo_filename);
    free(ifofile);
    return NULL;
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  }
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  bup_file_opened = 1;

  /* First check if this is a VMGI file. */
  if(ifoRead_VMG(ifofile)) {

    /* These are both mandatory. */
    if(!ifoRead_FP_PGC(ifofile) || !ifoRead_TT_SRPT(ifofile))
      goto ifoOpen_fail;

    ifoRead_PGCI_UT(ifofile);
    ifoRead_PTL_MAIT(ifofile);

    /* This is also mandatory. */
    if(!ifoRead_VTS_ATRT(ifofile))
      goto ifoOpen_fail;

    ifoRead_TXTDT_MGI(ifofile);
    ifoRead_C_ADT(ifofile);
    ifoRead_VOBU_ADMAP(ifofile);

    return ifofile;
  }

  if(ifoRead_VTS(ifofile)) {

    if(!ifoRead_VTS_PTT_SRPT(ifofile) || !ifoRead_PGCIT(ifofile))
      goto ifoOpen_fail;

    ifoRead_PGCI_UT(ifofile);
    ifoRead_VTS_TMAPT(ifofile);
    ifoRead_C_ADT(ifofile);
    ifoRead_VOBU_ADMAP(ifofile);

    if(!ifoRead_TITLE_C_ADT(ifofile) || !ifoRead_TITLE_VOBU_ADMAP(ifofile))
      goto ifoOpen_fail;

    return ifofile;
  }

ifoOpen_fail:
  fprintf(stderr, "libdvdread: Invalid IFO for title %d (%s).\n", title, ifo_filename);
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  ifoClose(ifofile);
  return NULL;
}


ifo_handle_t *ifoOpenVMGI(dvd_reader_t *dvd) {
  ifo_handle_t *ifofile;

  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return NULL;

  memset(ifofile, 0, sizeof(ifo_handle_t));

  ifofile->file = DVDOpenFile(dvd, 0, DVD_READ_INFO_FILE);
  if(!ifofile->file) /* Should really catch any error and try to fallback */
    ifofile->file = DVDOpenFile(dvd, 0, DVD_READ_INFO_BACKUP_FILE);
  if(!ifofile->file) {
    fprintf(stderr, "libdvdread: Can't open file VIDEO_TS.IFO.\n");
    free(ifofile);
    return NULL;
  }

  if(ifoRead_VMG(ifofile))
    return ifofile;

  fprintf(stderr, "libdvdread,ifoOpenVMGI(): Invalid main menu IFO (VIDEO_TS.IFO).\n");
  ifoClose(ifofile);
  return NULL;
}


ifo_handle_t *ifoOpenVTSI(dvd_reader_t *dvd, int title) {
  ifo_handle_t *ifofile;
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  ifofile = (ifo_handle_t *)malloc(sizeof(ifo_handle_t));
  if(!ifofile)
    return NULL;

  memset(ifofile, 0, sizeof(ifo_handle_t));
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  if(title <= 0 || title > 99) {
    fprintf(stderr, "libdvdread: ifoOpenVTSI invalid title (%d).\n", title);
    free(ifofile);
    return NULL;
  }
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  ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_FILE);
  if(!ifofile->file) /* Should really catch any error and try to fallback */
    ifofile->file = DVDOpenFile(dvd, title, DVD_READ_INFO_BACKUP_FILE);
  if(!ifofile->file) {
    fprintf(stderr, "libdvdread: Can't open file VTS_%02d_0.IFO.\n", title);
    free(ifofile);
    return NULL;
  }

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  if(ifoRead_VTS(ifofile) && ifofile->vtsi_mat)
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    return ifofile;

  fprintf(stderr, "libdvdread: Invalid IFO for title %d (VTS_%02d_0.IFO).\n",
          title, title);
  ifoClose(ifofile);
  return NULL;
}


void ifoClose(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
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  ifoFree_VOBU_ADMAP(ifofile);
  ifoFree_TITLE_VOBU_ADMAP(ifofile);
  ifoFree_C_ADT(ifofile);
  ifoFree_TITLE_C_ADT(ifofile);
  ifoFree_TXTDT_MGI(ifofile);
  ifoFree_VTS_ATRT(ifofile);
  ifoFree_PTL_MAIT(ifofile);
  ifoFree_PGCI_UT(ifofile);
  ifoFree_TT_SRPT(ifofile);
  ifoFree_FP_PGC(ifofile);
  ifoFree_PGCIT(ifofile);
  ifoFree_VTS_PTT_SRPT(ifofile);
  ifoFree_VTS_TMAPT(ifofile);

  if(ifofile->vmgi_mat)
    free(ifofile->vmgi_mat);

  if(ifofile->vtsi_mat)
    free(ifofile->vtsi_mat);

  DVDCloseFile(ifofile->file);
  ifofile->file = 0;
  free(ifofile);
  ifofile = 0;
}


static int ifoRead_VMG(ifo_handle_t *ifofile) {
  vmgi_mat_t *vmgi_mat;

  vmgi_mat = (vmgi_mat_t *)malloc(sizeof(vmgi_mat_t));
  if(!vmgi_mat)
    return 0;

  ifofile->vmgi_mat = vmgi_mat;

  if(!DVDFileSeek_(ifofile->file, 0)) {
    free(ifofile->vmgi_mat);
    ifofile->vmgi_mat = 0;
    return 0;
  }

  if(!DVDReadBytes(ifofile->file, vmgi_mat, sizeof(vmgi_mat_t))) {
    free(ifofile->vmgi_mat);
    ifofile->vmgi_mat = 0;
    return 0;
  }

  if(strncmp("DVDVIDEO-VMG", vmgi_mat->vmg_identifier, 12) != 0) {
    free(ifofile->vmgi_mat);
    ifofile->vmgi_mat = 0;
    return 0;
  }
545

546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576
  B2N_32(vmgi_mat->vmg_last_sector);
  B2N_32(vmgi_mat->vmgi_last_sector);
  B2N_32(vmgi_mat->vmg_category);
  B2N_16(vmgi_mat->vmg_nr_of_volumes);
  B2N_16(vmgi_mat->vmg_this_volume_nr);
  B2N_16(vmgi_mat->vmg_nr_of_title_sets);
  B2N_64(vmgi_mat->vmg_pos_code);
  B2N_32(vmgi_mat->vmgi_last_byte);
  B2N_32(vmgi_mat->first_play_pgc);
  B2N_32(vmgi_mat->vmgm_vobs);
  B2N_32(vmgi_mat->tt_srpt);
  B2N_32(vmgi_mat->vmgm_pgci_ut);
  B2N_32(vmgi_mat->ptl_mait);
  B2N_32(vmgi_mat->vts_atrt);
  B2N_32(vmgi_mat->txtdt_mgi);
  B2N_32(vmgi_mat->vmgm_c_adt);
  B2N_32(vmgi_mat->vmgm_vobu_admap);
  read_video_attr(&vmgi_mat->vmgm_video_attr);
  read_audio_attr(&vmgi_mat->vmgm_audio_attr);
  read_subp_attr(&vmgi_mat->vmgm_subp_attr);


  CHECK_ZERO(vmgi_mat->zero_1);
  CHECK_ZERO(vmgi_mat->zero_2);
  CHECK_ZERO(vmgi_mat->zero_3);
  CHECK_ZERO(vmgi_mat->zero_4);
  CHECK_ZERO(vmgi_mat->zero_5);
  CHECK_ZERO(vmgi_mat->zero_6);
  CHECK_ZERO(vmgi_mat->zero_7);
  CHECK_ZERO(vmgi_mat->zero_8);
  CHECK_ZERO(vmgi_mat->zero_9);
577
  CHECK_ZERO(vmgi_mat->zero_10);
578 579 580 581 582 583 584 585 586 587
  CHECK_VALUE(vmgi_mat->vmg_last_sector != 0);
  CHECK_VALUE(vmgi_mat->vmgi_last_sector != 0);
  CHECK_VALUE(vmgi_mat->vmgi_last_sector * 2 <= vmgi_mat->vmg_last_sector);
  CHECK_VALUE(vmgi_mat->vmgi_last_sector * 2 <= vmgi_mat->vmg_last_sector);
  CHECK_VALUE(vmgi_mat->vmg_nr_of_volumes != 0);
  CHECK_VALUE(vmgi_mat->vmg_this_volume_nr != 0);
  CHECK_VALUE(vmgi_mat->vmg_this_volume_nr <= vmgi_mat->vmg_nr_of_volumes);
  CHECK_VALUE(vmgi_mat->disc_side == 1 || vmgi_mat->disc_side == 2);
  CHECK_VALUE(vmgi_mat->vmg_nr_of_title_sets != 0);
  CHECK_VALUE(vmgi_mat->vmgi_last_byte >= 341);
588
  CHECK_VALUE(vmgi_mat->vmgi_last_byte / DVD_BLOCK_LEN <=
589
              vmgi_mat->vmgi_last_sector);
590 591
  /* It seems that first_play_pgc is optional. */
  CHECK_VALUE(vmgi_mat->first_play_pgc < vmgi_mat->vmgi_last_byte);
592
  CHECK_VALUE(vmgi_mat->vmgm_vobs == 0 ||
593 594
              (vmgi_mat->vmgm_vobs > vmgi_mat->vmgi_last_sector &&
               vmgi_mat->vmgm_vobs < vmgi_mat->vmg_last_sector));
595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
  CHECK_VALUE(vmgi_mat->tt_srpt <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vmgm_pgci_ut <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->ptl_mait <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vts_atrt <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->txtdt_mgi <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vmgm_c_adt <= vmgi_mat->vmgi_last_sector);
  CHECK_VALUE(vmgi_mat->vmgm_vobu_admap <= vmgi_mat->vmgi_last_sector);

  CHECK_VALUE(vmgi_mat->nr_of_vmgm_audio_streams <= 1);
  CHECK_VALUE(vmgi_mat->nr_of_vmgm_subp_streams <= 1);

  return 1;
}


static int ifoRead_VTS(ifo_handle_t *ifofile) {
  vtsi_mat_t *vtsi_mat;
  int i;

  vtsi_mat = (vtsi_mat_t *)malloc(sizeof(vtsi_mat_t));
  if(!vtsi_mat)
    return 0;
617

618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684
  ifofile->vtsi_mat = vtsi_mat;

  if(!DVDFileSeek_(ifofile->file, 0)) {
    free(ifofile->vtsi_mat);
    ifofile->vtsi_mat = 0;
    return 0;
  }

  if(!(DVDReadBytes(ifofile->file, vtsi_mat, sizeof(vtsi_mat_t)))) {
    free(ifofile->vtsi_mat);
    ifofile->vtsi_mat = 0;
    return 0;
  }

  if(strncmp("DVDVIDEO-VTS", vtsi_mat->vts_identifier, 12) != 0) {
    free(ifofile->vtsi_mat);
    ifofile->vtsi_mat = 0;
    return 0;
  }

  read_video_attr(&vtsi_mat->vtsm_video_attr);
  read_video_attr(&vtsi_mat->vts_video_attr);
  read_audio_attr(&vtsi_mat->vtsm_audio_attr);
  for(i=0; i<8; i++)
    read_audio_attr(&vtsi_mat->vts_audio_attr[i]);
  read_subp_attr(&vtsi_mat->vtsm_subp_attr);
  for(i=0; i<32; i++)
    read_subp_attr(&vtsi_mat->vts_subp_attr[i]);
  B2N_32(vtsi_mat->vts_last_sector);
  B2N_32(vtsi_mat->vtsi_last_sector);
  B2N_32(vtsi_mat->vts_category);
  B2N_32(vtsi_mat->vtsi_last_byte);
  B2N_32(vtsi_mat->vtsm_vobs);
  B2N_32(vtsi_mat->vtstt_vobs);
  B2N_32(vtsi_mat->vts_ptt_srpt);
  B2N_32(vtsi_mat->vts_pgcit);
  B2N_32(vtsi_mat->vtsm_pgci_ut);
  B2N_32(vtsi_mat->vts_tmapt);
  B2N_32(vtsi_mat->vtsm_c_adt);
  B2N_32(vtsi_mat->vtsm_vobu_admap);
  B2N_32(vtsi_mat->vts_c_adt);
  B2N_32(vtsi_mat->vts_vobu_admap);


  CHECK_ZERO(vtsi_mat->zero_1);
  CHECK_ZERO(vtsi_mat->zero_2);
  CHECK_ZERO(vtsi_mat->zero_3);
  CHECK_ZERO(vtsi_mat->zero_4);
  CHECK_ZERO(vtsi_mat->zero_5);
  CHECK_ZERO(vtsi_mat->zero_6);
  CHECK_ZERO(vtsi_mat->zero_7);
  CHECK_ZERO(vtsi_mat->zero_8);
  CHECK_ZERO(vtsi_mat->zero_9);
  CHECK_ZERO(vtsi_mat->zero_10);
  CHECK_ZERO(vtsi_mat->zero_11);
  CHECK_ZERO(vtsi_mat->zero_12);
  CHECK_ZERO(vtsi_mat->zero_13);
  CHECK_ZERO(vtsi_mat->zero_14);
  CHECK_ZERO(vtsi_mat->zero_15);
  CHECK_ZERO(vtsi_mat->zero_16);
  CHECK_ZERO(vtsi_mat->zero_17);
  CHECK_ZERO(vtsi_mat->zero_18);
  CHECK_ZERO(vtsi_mat->zero_19);
  CHECK_ZERO(vtsi_mat->zero_20);
  CHECK_ZERO(vtsi_mat->zero_21);
  CHECK_VALUE(vtsi_mat->vtsi_last_sector*2 <= vtsi_mat->vts_last_sector);
  CHECK_VALUE(vtsi_mat->vtsi_last_byte/DVD_BLOCK_LEN <= vtsi_mat->vtsi_last_sector);
685
  CHECK_VALUE(vtsi_mat->vtsm_vobs == 0 ||
686 687
              (vtsi_mat->vtsm_vobs > vtsi_mat->vtsi_last_sector &&
               vtsi_mat->vtsm_vobs < vtsi_mat->vts_last_sector));
688
  CHECK_VALUE(vtsi_mat->vtstt_vobs == 0 ||
689 690
              (vtsi_mat->vtstt_vobs > vtsi_mat->vtsi_last_sector &&
               vtsi_mat->vtstt_vobs < vtsi_mat->vts_last_sector));
691 692 693 694 695 696 697 698
  CHECK_VALUE(vtsi_mat->vts_ptt_srpt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_pgcit <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_pgci_ut <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_tmapt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_c_adt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vtsm_vobu_admap <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_c_adt <= vtsi_mat->vtsi_last_sector);
  CHECK_VALUE(vtsi_mat->vts_vobu_admap <= vtsi_mat->vtsi_last_sector);
699

700 701 702 703 704 705 706 707 708
  CHECK_VALUE(vtsi_mat->nr_of_vtsm_audio_streams <= 1);
  CHECK_VALUE(vtsi_mat->nr_of_vtsm_subp_streams <= 1);

  CHECK_VALUE(vtsi_mat->nr_of_vts_audio_streams <= 8);
  for(i = vtsi_mat->nr_of_vts_audio_streams; i < 8; i++)
    CHECK_ZERO(vtsi_mat->vts_audio_attr[i]);

  CHECK_VALUE(vtsi_mat->nr_of_vts_subp_streams <= 32);
  for(i = vtsi_mat->nr_of_vts_subp_streams; i < 32; i++)
709 710
    CHECK_ZERO(vtsi_mat->vts_subp_attr[i]);

711 712 713 714 715 716 717 718 719
  for(i = 0; i < 8; i++) {
    read_multichannel_ext(&vtsi_mat->vts_mu_audio_attr[i]);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero1);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero2);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero3);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero4);
    CHECK_ZERO0(vtsi_mat->vts_mu_audio_attr[i].zero5);
    CHECK_ZERO(vtsi_mat->vts_mu_audio_attr[i].zero6);
  }
720

721 722 723 724
  return 1;
}


725 726
static int ifoRead_PGC_COMMAND_TBL(ifo_handle_t *ifofile,
                                   pgc_command_tbl_t *cmd_tbl,
727
                                   unsigned int offset) {
728

729
  memset(cmd_tbl, 0, sizeof(pgc_command_tbl_t));
730

731 732 733 734 735 736 737 738 739 740 741
  if(!DVDFileSeek_(ifofile->file, offset))
    return 0;

  if(!(DVDReadBytes(ifofile->file, cmd_tbl, PGC_COMMAND_TBL_SIZE)))
    return 0;

  B2N_16(cmd_tbl->nr_of_pre);
  B2N_16(cmd_tbl->nr_of_post);
  B2N_16(cmd_tbl->nr_of_cell);

  CHECK_VALUE(cmd_tbl->nr_of_pre + cmd_tbl->nr_of_post + cmd_tbl->nr_of_cell<= 255);
742

743 744 745 746 747 748 749 750 751 752 753
  if(cmd_tbl->nr_of_pre != 0) {
    unsigned int pre_cmds_size  = cmd_tbl->nr_of_pre * COMMAND_DATA_SIZE;
    cmd_tbl->pre_cmds = (vm_cmd_t *)malloc(pre_cmds_size);
    if(!cmd_tbl->pre_cmds)
      return 0;

    if(!(DVDReadBytes(ifofile->file, cmd_tbl->pre_cmds, pre_cmds_size))) {
      free(cmd_tbl->pre_cmds);
      return 0;
    }
  }
754

755 756 757 758
  if(cmd_tbl->nr_of_post != 0) {
    unsigned int post_cmds_size = cmd_tbl->nr_of_post * COMMAND_DATA_SIZE;
    cmd_tbl->post_cmds = (vm_cmd_t *)malloc(post_cmds_size);
    if(!cmd_tbl->post_cmds) {
759
      if(cmd_tbl->pre_cmds)
760
        free(cmd_tbl->pre_cmds);
761 762 763
      return 0;
    }
    if(!(DVDReadBytes(ifofile->file, cmd_tbl->post_cmds, post_cmds_size))) {
764
      if(cmd_tbl->pre_cmds)
765
        free(cmd_tbl->pre_cmds);
766 767 768 769 770 771 772 773 774 775
      free(cmd_tbl->post_cmds);
      return 0;
    }
  }

  if(cmd_tbl->nr_of_cell != 0) {
    unsigned int cell_cmds_size = cmd_tbl->nr_of_cell * COMMAND_DATA_SIZE;
    cmd_tbl->cell_cmds = (vm_cmd_t *)malloc(cell_cmds_size);
    if(!cmd_tbl->cell_cmds) {
      if(cmd_tbl->pre_cmds)
776
        free(cmd_tbl->pre_cmds);
777
      if(cmd_tbl->post_cmds)
778
        free(cmd_tbl->post_cmds);
779 780 781
      return 0;
    }
    if(!(DVDReadBytes(ifofile->file, cmd_tbl->cell_cmds, cell_cmds_size))) {
782
      if(cmd_tbl->pre_cmds)
783
        free(cmd_tbl->pre_cmds);
784
      if(cmd_tbl->post_cmds)
785
        free(cmd_tbl->post_cmds);
786 787 788 789
      free(cmd_tbl->cell_cmds);
      return 0;
    }
  }
790 791

  /*
792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809
   * Make a run over all the commands and see that we can interpret them all?
   */
  return 1;
}


static void ifoFree_PGC_COMMAND_TBL(pgc_command_tbl_t *cmd_tbl) {
  if(cmd_tbl) {
    if(cmd_tbl->nr_of_pre && cmd_tbl->pre_cmds)
      free(cmd_tbl->pre_cmds);
    if(cmd_tbl->nr_of_post && cmd_tbl->post_cmds)
      free(cmd_tbl->post_cmds);
    if(cmd_tbl->nr_of_cell && cmd_tbl->cell_cmds)
      free(cmd_tbl->cell_cmds);
    free(cmd_tbl);
  }
}

810 811
static int ifoRead_PGC_PROGRAM_MAP(ifo_handle_t *ifofile,
                                   pgc_program_map_t *program_map,
812
                                   unsigned int nr, unsigned int offset) {
813 814 815 816
  unsigned int size = nr * sizeof(pgc_program_map_t);

  if(!DVDFileSeek_(ifofile->file, offset))
    return 0;
817

818 819 820 821 822 823
  if(!(DVDReadBytes(ifofile->file, program_map, size)))
    return 0;

  return 1;
}

824
static int ifoRead_CELL_PLAYBACK_TBL(ifo_handle_t *ifofile,
825 826 827 828 829 830 831 832 833 834 835 836 837 838
                                     cell_playback_t *cell_playback,
                                     unsigned int nr, unsigned int offset) {
  unsigned int i;
  unsigned int size = nr * sizeof(cell_playback_t);

  if(!DVDFileSeek_(ifofile->file, offset))
    return 0;

  if(!(DVDReadBytes(ifofile->file, cell_playback, size)))
    return 0;

  for(i = 0; i < nr; i++) {
    read_cell_playback(&cell_playback[i]);
    /* Changed < to <= because this was false in the movie 'Pi'. */
839
    CHECK_VALUE(cell_playback[i].last_vobu_start_sector <=
840
                cell_playback[i].last_sector);
841
    CHECK_VALUE(cell_playback[i].first_sector <=
842
                cell_playback[i].last_vobu_start_sector);
843 844 845 846 847 848
  }

  return 1;
}


849 850
static int ifoRead_CELL_POSITION_TBL(ifo_handle_t *ifofile,
                                     cell_position_t *cell_position,
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
                                     unsigned int nr, unsigned int offset) {
  unsigned int i;
  unsigned int size = nr * sizeof(cell_position_t);

  if(!DVDFileSeek_(ifofile->file, offset))
    return 0;

  if(!(DVDReadBytes(ifofile->file, cell_position, size)))
    return 0;

  for(i = 0; i < nr; i++) {
    B2N_16(cell_position[i].vob_id_nr);
    CHECK_ZERO(cell_position[i].zero_1);
  }

  return 1;
}

static int ifoRead_PGC(ifo_handle_t *ifofile, pgc_t *pgc, unsigned int offset) {
  unsigned int i;

  if(!DVDFileSeek_(ifofile->file, offset))
    return 0;
874

875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
  if(!(DVDReadBytes(ifofile->file, pgc, PGC_SIZE)))
    return 0;

  read_user_ops(&pgc->prohibited_ops);
  B2N_16(pgc->next_pgc_nr);
  B2N_16(pgc->prev_pgc_nr);
  B2N_16(pgc->goup_pgc_nr);
  B2N_16(pgc->command_tbl_offset);
  B2N_16(pgc->program_map_offset);
  B2N_16(pgc->cell_playback_offset);
  B2N_16(pgc->cell_position_offset);

  for(i = 0; i < 8; i++)
    B2N_16(pgc->audio_control[i]);
  for(i = 0; i < 32; i++)
    B2N_32(pgc->subp_control[i]);
  for(i = 0; i < 16; i++)
    B2N_32(pgc->palette[i]);
893

894 895 896 897 898
  CHECK_ZERO(pgc->zero_1);
  CHECK_VALUE(pgc->nr_of_programs <= pgc->nr_of_cells);

  /* verify time (look at print_time) */
  for(i = 0; i < 8; i++)
899
    if(!(pgc->audio_control[i] & 0x8000)) /* The 'is present' bit */
900 901
      CHECK_ZERO(pgc->audio_control[i]);
  for(i = 0; i < 32; i++)
902
    if(!(pgc->subp_control[i] & 0x80000000)) /* The 'is present' bit */
903
      CHECK_ZERO(pgc->subp_control[i]);
904

905 906 907 908 909 910 911 912 913 914 915 916
  /* Check that time is 0:0:0:0 also if nr_of_programs == 0 */
  if(pgc->nr_of_programs == 0) {
    CHECK_ZERO(pgc->still_time);
    CHECK_ZERO(pgc->pg_playback_mode); /* ?? */
    CHECK_VALUE(pgc->program_map_offset == 0);
    CHECK_VALUE(pgc->cell_playback_offset == 0);
    CHECK_VALUE(pgc->cell_position_offset == 0);
  } else {
    CHECK_VALUE(pgc->program_map_offset != 0);
    CHECK_VALUE(pgc->cell_playback_offset != 0);
    CHECK_VALUE(pgc->cell_position_offset != 0);
  }
917

918 919 920 921 922
  if(pgc->command_tbl_offset != 0) {
    pgc->command_tbl = malloc(sizeof(pgc_command_tbl_t));
    if(!pgc->command_tbl)
      return 0;

923
    if(!ifoRead_PGC_COMMAND_TBL(ifofile, pgc->command_tbl,
924 925 926 927 928 929
                                offset + pgc->command_tbl_offset)) {
      return 0;
    }
  } else {
    pgc->command_tbl = NULL;
  }
930

931 932 933 934 935 936 937 938 939 940 941 942
  if(pgc->program_map_offset != 0 && pgc->nr_of_programs>0) {
    pgc->program_map = malloc(pgc->nr_of_programs * sizeof(pgc_program_map_t));
    if(!pgc->program_map) {
      return 0;
    }
    if(!ifoRead_PGC_PROGRAM_MAP(ifofile, pgc->program_map,pgc->nr_of_programs,
                                offset + pgc->program_map_offset)) {
      return 0;
    }
  } else {
    pgc->program_map = NULL;
  }
943

944 945 946 947 948
  if(pgc->cell_playback_offset != 0 && pgc->nr_of_cells>0) {
    pgc->cell_playback = malloc(pgc->nr_of_cells * sizeof(cell_playback_t));
    if(!pgc->cell_playback) {
      return 0;
    }
949
    if(!ifoRead_CELL_PLAYBACK_TBL(ifofile, pgc->cell_playback,
950
                                  pgc->nr_of_cells,
951 952 953 954 955 956
                                  offset + pgc->cell_playback_offset)) {
      return 0;
    }
  } else {
    pgc->cell_playback = NULL;
  }
957

958 959 960 961 962
  if(pgc->cell_position_offset != 0 && pgc->nr_of_cells>0) {
    pgc->cell_position = malloc(pgc->nr_of_cells * sizeof(cell_position_t));
    if(!pgc->cell_position) {
      return 0;
    }
963
    if(!ifoRead_CELL_POSITION_TBL(ifofile, pgc->cell_position,
964
                                  pgc->nr_of_cells,
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
                                  offset + pgc->cell_position_offset)) {
      return 0;
    }
  } else {
    pgc->cell_position = NULL;
  }

  return 1;
}

int ifoRead_FP_PGC(ifo_handle_t *ifofile) {

  if(!ifofile)
    return 0;

  if(!ifofile->vmgi_mat)
    return 0;
982

983 984 985 986
  /* It seems that first_play_pgc is optional after all. */
  ifofile->first_play_pgc = 0;
  if(ifofile->vmgi_mat->first_play_pgc == 0)
    return 1;
987

988
  ifofile->first_play_pgc = (pgc_t *)calloc(1, sizeof(pgc_t));
989 990
  if(!ifofile->first_play_pgc)
    return 0;
991

992
  ifofile->first_play_pgc->ref_count = 1;
993
  if(!ifoRead_PGC(ifofile, ifofile->first_play_pgc,
994
                  ifofile->vmgi_mat->first_play_pgc)) {
995
    ifoFree_PGC(&ifofile->first_play_pgc);
996 997 998 999 1000 1001
    return 0;
  }

  return 1;
}

1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
static void ifoFree_PGC(pgc_t **pgc) {
  if(pgc && *pgc && (--(*pgc)->ref_count) <= 0) {
    ifoFree_PGC_COMMAND_TBL((*pgc)->command_tbl);
    if((*pgc)->program_map)
      free((*pgc)->program_map);
    if((*pgc)->cell_playback)
      free((*pgc)->cell_playback);
    if((*pgc)->cell_position)
      free((*pgc)->cell_position);
    free(*pgc);
  }
  if (pgc) {
    *pgc = NULL;
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  }
}

void ifoFree_FP_PGC(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
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  if(ifofile->first_play_pgc) {
1023
    ifoFree_PGC(&ifofile->first_play_pgc);
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  }
}


int ifoRead_TT_SRPT(ifo_handle_t *ifofile) {
  tt_srpt_t *tt_srpt;
  int i, info_length;

  if(!ifofile)
    return 0;

  if(!ifofile->vmgi_mat)
    return 0;

  if(ifofile->vmgi_mat->tt_srpt == 0) /* mandatory */
    return 0;

  if(!DVDFileSeek_(ifofile->file, ifofile->vmgi_mat->tt_srpt * DVD_BLOCK_LEN))
    return 0;

  tt_srpt = (tt_srpt_t *)malloc(sizeof(tt_srpt_t));
  if(!tt_srpt)
    return 0;

  ifofile->tt_srpt = tt_srpt;
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  if(!(DVDReadBytes(ifofile->file, tt_srpt, TT_SRPT_SIZE))) {
    fprintf(stderr, "libdvdread: Unable to read read TT_SRPT.\n");
    free(tt_srpt);
    return 0;
  }

  B2N_16(tt_srpt->nr_of_srpts);
  B2N_32(tt_srpt->last_byte);
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  info_length = tt_srpt->last_byte + 1 - TT_SRPT_SIZE;

1061
  tt_srpt->title = (title_info_t *)malloc(info_length);
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  if(!tt_srpt->title) {
    free(tt_srpt);
    ifofile->tt_srpt = 0;
    return 0;
  }
  if(!(DVDReadBytes(ifofile->file, tt_srpt->title, info_length))) {
    fprintf(stderr, "libdvdread: Unable to read read TT_SRPT.\n");
    ifoFree_TT_SRPT(ifofile);
    return 0;
  }

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  if(tt_srpt->nr_of_srpts>info_length/sizeof(title_info_t)){
    fprintf(stderr,"libdvdread: data mismatch: info_length (%ld)!= nr_of_srpts (%d). Truncating.\n",
            info_length/sizeof(title_info_t),tt_srpt->nr_of_srpts);
    tt_srpt->nr_of_srpts=info_length/sizeof(title_info_t);
  }

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  for(i =  0; i < tt_srpt->nr_of_srpts; i++) {
    B2N_16(tt_srpt->title[i].nr_of_ptts);
    B2N_16(tt_srpt->title[i].parental_id);
    B2N_32(tt_srpt->title[i].title_set_sector);
  }
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  CHECK_ZERO(tt_srpt->zero_1);
  CHECK_VALUE(tt_srpt->nr_of_srpts != 0);
  CHECK_VALUE(tt_srpt->nr_of_srpts < 100); /* ?? */
  CHECK_VALUE((int)tt_srpt->nr_of_srpts * sizeof(title_info_t) <= info_length);
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  for(i = 0; i < tt_srpt->nr_of_srpts; i++) {
    read_playback_type(&tt_srpt->title[i].pb_ty);
    CHECK_VALUE(tt_srpt->title[i].pb_ty.zero_1 == 0);
    CHECK_VALUE(tt_srpt->title[i].nr_of_angles != 0);
    CHECK_VALUE(tt_srpt->title[i].nr_of_angles < 10);
    /* CHECK_VALUE(tt_srpt->title[i].nr_of_ptts != 0); */
    /* XXX: this assertion breaks Ghostbusters: */
    CHECK_VALUE(tt_srpt->title[i].nr_of_ptts < 1000); /* ?? */
    CHECK_VALUE(tt_srpt->title[i].title_set_nr != 0);
    CHECK_VALUE(tt_srpt->title[i].title_set_nr < 100); /* ?? */
    CHECK_VALUE(tt_srpt->title[i].vts_ttn != 0);
    CHECK_VALUE(tt_srpt->title[i].vts_ttn < 100); /* ?? */
    /* CHECK_VALUE(tt_srpt->title[i].title_set_sector != 0); */
  }
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  /* Make this a function */
#if 0
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  if(memcmp((uint8_t *)tt_srpt->title +
            tt_srpt->nr_of_srpts * sizeof(title_info_t),
            my_friendly_zeros,
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            info_length - tt_srpt->nr_of_srpts * sizeof(title_info_t))) {
    fprintf(stderr, "VMG_PTT_SRPT slack is != 0, ");
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    hexdump((uint8_t *)tt_srpt->title +
            tt_srpt->nr_of_srpts * sizeof(title_info_t),
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            info_length - tt_srpt->nr_of_srpts * sizeof(title_info_t));
  }
#endif

  return 1;
}


void ifoFree_TT_SRPT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
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  if(ifofile->tt_srpt) {
    free(ifofile->tt_srpt->title);
    free(ifofile->tt_srpt);
    ifofile->tt_srpt = 0;
  }
}


int ifoRead_VTS_PTT_SRPT(ifo_handle_t *ifofile) {
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  vts_ptt_srpt_t *vts_ptt_srpt = NULL;
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  int info_length, i, j;
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  uint32_t *data = NULL;
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  if(!ifofile)
    return 0;
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  if(!ifofile->vtsi_mat)
    return 0;

  if(ifofile->vtsi_mat->vts_ptt_srpt == 0) /* mandatory */
    return 0;
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  if(!DVDFileSeek_(ifofile->file,
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                   ifofile->vtsi_mat->vts_ptt_srpt * DVD_BLOCK_LEN))
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    return 0;

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  vts_ptt_srpt = malloc(sizeof(vts_ptt_srpt_t));
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  if(!vts_ptt_srpt)
    return 0;

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  vts_ptt_srpt->title = NULL;
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  ifofile->vts_ptt_srpt = vts_ptt_srpt;

  if(!(DVDReadBytes(ifofile->file, vts_ptt_srpt, VTS_PTT_SRPT_SIZE))) {
    fprintf(stderr, "libdvdread: Unable to read PTT search table.\n");
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    goto fail;
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  }

  B2N_16(vts_ptt_srpt->nr_of_srpts);
  B2N_32(vts_ptt_srpt->last_byte);

  CHECK_ZERO(vts_ptt_srpt->zero_1);
  CHECK_VALUE(vts_ptt_srpt->nr_of_srpts != 0);
  CHECK_VALUE(vts_ptt_srpt->nr_of_srpts < 100); /* ?? */
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  info_length = vts_ptt_srpt->last_byte + 1 - VTS_PTT_SRPT_SIZE;
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  data = malloc(info_length);
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  if(!data)
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    goto fail;
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  if(!(DVDReadBytes(ifofile->file, data, info_length))) {
    fprintf(stderr, "libdvdread: Unable to read PTT search table.\n");
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    goto fail;
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  }

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  if(vts_ptt_srpt->nr_of_srpts > info_length / sizeof(*data)) {
    fprintf(stderr, "libdvdread: PTT search table too small.\n");
    goto fail;
  }
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  for(i = 0; i < vts_ptt_srpt->nr_of_srpts; i++) {
    B2N_32(data[i]);
    /* assert(data[i] + sizeof(ptt_info_t) <= vts_ptt_srpt->last_byte + 1);
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       Magic Knight Rayearth Daybreak is mastered very strange and has
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       Titles with 0 PTTs. They all have a data[i] offsets beyond the end of
       of the vts_ptt_srpt structure. */
    CHECK_VALUE(data[i] + sizeof(ptt_info_t) <= vts_ptt_srpt->last_byte + 1 + 4);
  }
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  vts_ptt_srpt->ttu_offset = data;
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  vts_ptt_srpt->title = malloc(vts_ptt_srpt->nr_of_srpts * sizeof(ttu_t));
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  if(!vts_ptt_srpt->title)
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    goto fail;
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  for(i = 0; i < vts_ptt_srpt->nr_of_srpts; i++) {
    int n;
    if(i < vts_ptt_srpt->nr_of_srpts - 1)
      n = (data[i+1] - data[i]);
    else
      n = (vts_ptt_srpt->last_byte + 1 - data[i]);
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    /* assert(n > 0 && (n % 4) == 0);
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       Magic Knight Rayearth Daybreak is mastered very strange and has
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       Titles with 0 PTTs. */
    if(n < 0) n = 0;
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1213
    CHECK_VALUE(n % 4 == 0);
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    vts_ptt_srpt->title[i].nr_of_ptts = n / 4;
    vts_ptt_srpt->title[i].ptt = malloc(n * sizeof(ptt_info_t));
    if(!vts_ptt_srpt->title[i].ptt) {
      for(n = 0; n < i; n++)
        free(vts_ptt_srpt->title[n].ptt);
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      goto fail;
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    }
    for(j = 0; j < vts_ptt_srpt->title[i].nr_of_ptts; j++) {
      /* The assert placed here because of Magic Knight Rayearth Daybreak */
      CHECK_VALUE(data[i] + sizeof(ptt_info_t) <= vts_ptt_srpt->last_byte + 1);
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      vts_ptt_srpt->title[i].ptt[j].pgcn
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        = *(uint16_t*)(((char *)data) + data[i] + 4*j - VTS_PTT_SRPT_SIZE);
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      vts_ptt_srpt->title[i].ptt[j].pgn
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        = *(uint16_t*)(((char *)data) + data[i] + 4*j + 2 - VTS_PTT_SRPT_SIZE);
    }
  }
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  for(i = 0; i < vts_ptt_srpt->nr_of_srpts; i++) {
    for(j = 0; j < vts_ptt_srpt->title[i].nr_of_ptts; j++) {
      B2N_16(vts_ptt_srpt->title[i].ptt[j].pgcn);
      B2N_16(vts_ptt_srpt->title[i].ptt[j].pgn);
    }
  }
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  for(i = 0; i < vts_ptt_srpt->nr_of_srpts; i++) {
    CHECK_VALUE(vts_ptt_srpt->title[i].nr_of_ptts < 1000); /* ?? */
    for(j = 0; j < vts_ptt_srpt->title[i].nr_of_ptts; j++) {
      CHECK_VALUE(vts_ptt_srpt->title[i].ptt[j].pgcn != 0 );
      CHECK_VALUE(vts_ptt_srpt->title[i].ptt[j].pgcn < 1000); /* ?? */
      CHECK_VALUE(vts_ptt_srpt->title[i].ptt[j].pgn != 0);
      CHECK_VALUE(vts_ptt_srpt->title[i].ptt[j].pgn < 100); /* ?? */
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      if (vts_ptt_srpt->title[i].ptt[j].pgcn == 0 ||
          vts_ptt_srpt->title[i].ptt[j].pgcn >= 1000 ||
          vts_ptt_srpt->title[i].ptt[j].pgn == 0 ||
          vts_ptt_srpt->title[i].ptt[j].pgn >= 100) {
        return 0;
      }

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    }
  }

  return 1;
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fail:
  free(data);
  ifofile->vts_ptt_srpt = 0;
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  free(vts_ptt_srpt->title);
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  free(vts_ptt_srpt);
  return 0;
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}


void ifoFree_VTS_PTT_SRPT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
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  if(ifofile->vts_ptt_srpt) {
    int i;
    for(i = 0; i < ifofile->vts_ptt_srpt->nr_of_srpts; i++)
      free(ifofile->vts_ptt_srpt->title[i].ptt);
    free(ifofile->vts_ptt_srpt->ttu_offset);
    free(ifofile->vts_ptt_srpt->title);
    free(ifofile->vts_ptt_srpt);
    ifofile->vts_ptt_srpt = 0;
  }
}


int ifoRead_PTL_MAIT(ifo_handle_t *ifofile) {
  ptl_mait_t *ptl_mait;
  int info_length;
  unsigned int i, j;

  if(!ifofile)
    return 0;
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  if(!ifofile->vmgi_mat)
    return 0;
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1295
  if(ifofile->vmgi_mat->ptl_mait == NULL)
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    return 1;

  if(!DVDFileSeek_(ifofile->file, ifofile->vmgi_mat->ptl_mait * DVD_BLOCK_LEN))
    return 0;

  ptl_mait = (ptl_mait_t *)malloc(sizeof(ptl_mait_t));
  if(!ptl_mait)
    return 0;

  ifofile->ptl_mait = ptl_mait;

  if(!(DVDReadBytes(ifofile->file, ptl_mait, PTL_MAIT_SIZE))) {
    free(ptl_mait);
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    ifofile->ptl_mait = NULL;
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    return 0;
  }

  B2N_16(ptl_mait->nr_of_countries);
  B2N_16(ptl_mait->nr_of_vtss);
  B2N_32(ptl_mait->last_byte);
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  CHECK_VALUE(ptl_mait->nr_of_countries != 0);
  CHECK_VALUE(ptl_mait->nr_of_countries < 100); /* ?? */
  CHECK_VALUE(ptl_mait->nr_of_vtss != 0);
  CHECK_VALUE(ptl_mait->nr_of_vtss < 100); /* ?? */
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  CHECK_VALUE(ptl_mait->nr_of_countries * PTL_MAIT_COUNTRY_SIZE
1322
              <= ptl_mait->last_byte + 1 - PTL_MAIT_SIZE);
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1324 1325 1326 1327
  info_length = ptl_mait->nr_of_countries * sizeof(ptl_mait_country_t);
  ptl_mait->countries = (ptl_mait_country_t *)malloc(info_length);
  if(!ptl_mait->countries) {
    free(ptl_mait);
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    ifofile->ptl_mait = NULL;
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    return 0;
  }
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  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    ptl_mait->countries[i].pf_ptl_mai = NULL;
  }
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  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    if(!(DVDReadBytes(ifofile->file, &ptl_mait->countries[i], PTL_MAIT_COUNTRY_SIZE))) {
      fprintf(stderr, "libdvdread: Unable to read PTL_MAIT.\n");
      free(ptl_mait->countries);
      free(ptl_mait);
1340
      ifofile->ptl_mait = NULL;
1341 1342 1343 1344 1345 1346 1347 1348
      return 0;
    }
  }

  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    B2N_16(ptl_mait->countries[i].country_code);
    B2N_16(ptl_mait->countries[i].pf_ptl_mai_start_byte);
  }
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1350 1351
  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    CHECK_ZERO(ptl_mait->countries[i].zero_1);
1352
    CHECK_ZERO(ptl_mait->countries[i].zero_2);
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    CHECK_VALUE(ptl_mait->countries[i].pf_ptl_mai_start_byte
1354
                + sizeof(pf_level_t) * (ptl_mait->nr_of_vtss + 1) <= ptl_mait->last_byte + 1);
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  }

  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    uint16_t *pf_temp;
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    if(!DVDFileSeek_(ifofile->file,
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                     ifofile->vmgi_mat->ptl_mait * DVD_BLOCK_LEN
1362
                     + ptl_mait->countries[i].pf_ptl_mai_start_byte)) {
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      fprintf(stderr, "libdvdread: Unable to seek PTL_MAIT table at index %d.\n",i);
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      free(ptl_mait->countries);
      free(ptl_mait);
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      ifofile->ptl_mait = NULL;
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      return 0;
    }
    info_length = (ptl_mait->nr_of_vtss + 1) * sizeof(pf_level_t);
    pf_temp = (uint16_t *)malloc(info_length);
    if(!pf_temp) {
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      free_ptl_mait(ptl_mait, i);
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      ifofile->ptl_mait = NULL;
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      return 0;
    }
1376
    memset(pf_temp, 0, info_length);
1377
    if(!(DVDReadBytes(ifofile->file, pf_temp, info_length))) {
1378
      fprintf(stderr, "libdvdread: Unable to read PTL_MAIT table at index %d.\n",i);
1379 1380
      free(pf_temp);
      free_ptl_mait(ptl_mait, i);
1381
      ifofile->ptl_mait = NULL;
1382
      return 0;
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    }
    for (j = 0; j < ((ptl_mait->nr_of_vtss + 1) * 8); j++) {
1385
      B2N_16(pf_temp[j]);
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    }
    ptl_mait->countries[i].pf_ptl_mai = (pf_level_t *)malloc(info_length);
    if(!ptl_mait->countries[i].pf_ptl_mai) {
      free(pf_temp);
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      free_ptl_mait(ptl_mait, i);
1391
      ifofile->ptl_mait = NULL;
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      return 0;
    }
    { /* Transpose the array so we can use C indexing. */
      int level, vts;
1396
      for(level = 0; level < PTL_MAIT_NUM_LEVEL; level++) {
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        for(vts = 0; vts <= ptl_mait->nr_of_vtss; vts++) {
          ptl_mait->countries[i].pf_ptl_mai[vts][level] =
            pf_temp[(7-level)*(ptl_mait->nr_of_vtss+1) + vts];
        }
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      }
      free(pf_temp);
    }
  }
  return 1;
}

void ifoFree_PTL_MAIT(ifo_handle_t *ifofile) {
  unsigned int i;
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1411 1412
  if(!ifofile)
    return;
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1414 1415
  if(ifofile->ptl_mait) {
    for(i = 0; i < ifofile->ptl_mait->nr_of_countries; i++) {
1416
      free(ifofile->ptl_mait->countries[i].pf_ptl_mai);
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    }
    free(ifofile->ptl_mait->countries);
    free(ifofile->ptl_mait);
1420
    ifofile->ptl_mait = NULL;
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  }
}

int ifoRead_VTS_TMAPT(ifo_handle_t *ifofile) {
  vts_tmapt_t *vts_tmapt;
  uint32_t *vts_tmap_srp;
  unsigned int offset;
  int info_length;
  unsigned int i, j;
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  if(!ifofile)
    return 0;

  if(!ifofile->vtsi_mat)
    return 0;

  if(ifofile->vtsi_mat->vts_tmapt == 0) { /* optional(?) */
    ifofile->vts_tmapt = NULL;
    return 1;
  }
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1442
  offset = ifofile->vtsi_mat->vts_tmapt * DVD_BLOCK_LEN;
1443 1444

  if(!DVDFileSeek_(ifofile->file, offset))
1445
    return 0;
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1447 1448 1449
  vts_tmapt = (vts_tmapt_t *)malloc(sizeof(vts_tmapt_t));
  if(!vts_tmapt)
    return 0;
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1451
  ifofile->vts_tmapt = vts_tmapt;
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  if(!(DVDReadBytes(ifofile->file, vts_tmapt, VTS_TMAPT_SIZE))) {
    fprintf(stderr, "libdvdread: Unable to read VTS_TMAPT.\n");
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  B2N_16(vts_tmapt->nr_of_tmaps);
  B2N_32(vts_tmapt->last_byte);
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1463
  CHECK_ZERO(vts_tmapt->zero_1);
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1465
  info_length = vts_tmapt->nr_of_tmaps * 4;
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1467 1468 1469 1470 1471 1472 1473 1474
  vts_tmap_srp = (uint32_t *)malloc(info_length);
  if(!vts_tmap_srp) {
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  vts_tmapt->tmap_offset = vts_tmap_srp;
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1476 1477 1478 1479 1480 1481 1482 1483 1484
  if(!(DVDReadBytes(ifofile->file, vts_tmap_srp, info_length))) {
    fprintf(stderr, "libdvdread: Unable to read VTS_TMAPT.\n");
    free(vts_tmap_srp);
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  for (i = 0; i < vts_tmapt->nr_of_tmaps; i++) {
1485
    B2N_32(vts_tmap_srp[i]);
1486 1487
  }

1488

1489
  info_length = vts_tmapt->nr_of_tmaps * sizeof(vts_tmap_t);
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  vts_tmapt->tmap = (vts_tmap_t *)malloc(info_length);
  if(!vts_tmapt->tmap) {
    free(vts_tmap_srp);
    free(vts_tmapt);
    ifofile->vts_tmapt = NULL;
    return 0;
  }

  memset(vts_tmapt->tmap, 0, info_length); /* So ifoFree_VTS_TMAPT works. */
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  for(i = 0; i < vts_tmapt->nr_of_tmaps; i++) {
    if(!DVDFileSeek_(ifofile->file, offset + vts_tmap_srp[i])) {
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }

    if(!(DVDReadBytes(ifofile->file, &vts_tmapt->tmap[i], VTS_TMAP_SIZE))) {
      fprintf(stderr, "libdvdread: Unable to read VTS_TMAP.\n");
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }
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1513 1514
    B2N_16(vts_tmapt->tmap[i].nr_of_entries);
    CHECK_ZERO(vts_tmapt->tmap[i].zero_1);
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1516 1517 1518 1519
    if(vts_tmapt->tmap[i].nr_of_entries == 0) { /* Early out if zero entries */
      vts_tmapt->tmap[i].map_ent = NULL;
      continue;
    }
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1521
    info_length = vts_tmapt->tmap[i].nr_of_entries * sizeof(map_ent_t);
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    vts_tmapt->tmap[i].map_ent = (map_ent_t *)malloc(info_length);
    if(!vts_tmapt->tmap[i].map_ent) {
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }

    if(!(DVDReadBytes(ifofile->file, vts_tmapt->tmap[i].map_ent, info_length))) {
      fprintf(stderr, "libdvdread: Unable to read VTS_TMAP_ENT.\n");
      ifoFree_VTS_TMAPT(ifofile);
      return 0;
    }
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    for(j = 0; j < vts_tmapt->tmap[i].nr_of_entries; j++)
      B2N_32(vts_tmapt->tmap[i].map_ent[j]);
1537 1538
  }

1539 1540 1541 1542 1543
  return 1;
}

void ifoFree_VTS_TMAPT(ifo_handle_t *ifofile) {
  unsigned int i;
1544

1545 1546
  if(!ifofile)
    return;
1547 1548

  if(ifofile->vts_tmapt) {
1549 1550
    for(i = 0; i < ifofile->vts_tmapt->nr_of_tmaps; i++)
      if(ifofile->vts_tmapt->tmap[i].map_ent)
1551
        free(ifofile->vts_tmapt->tmap[i].map_ent);
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    free(ifofile->vts_tmapt->tmap);
    free(ifofile->vts_tmapt->tmap_offset);
    free(ifofile->vts_tmapt);
    ifofile->vts_tmapt = NULL;
  }
}


int ifoRead_TITLE_C_ADT(ifo_handle_t *ifofile) {

  if(!ifofile)
    return 0;

  if(!ifofile->vtsi_mat)
    return 0;

  if(ifofile->vtsi_mat->vts_c_adt == 0) /* mandatory */
    return 0;

  ifofile->vts_c_adt = (c_adt_t *)malloc(sizeof(c_adt_t));
  if(!ifofile->vts_c_adt)
    return 0;

1575
  if(!ifoRead_C_ADT_internal(ifofile, ifofile->vts_c_adt,
1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589
                             ifofile->vtsi_mat->vts_c_adt)) {
    free(ifofile->vts_c_adt);
    ifofile->vts_c_adt = 0;
    return 0;
  }

  return 1;
}

int ifoRead_C_ADT(ifo_handle_t *ifofile) {
  unsigned int sector;

  if(!ifofile)
    return 0;
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