ifo_read.c

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  if(!ifofile->vmgi_mat)
    return 0;
  
  /* 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;
  
  ifofile->first_play_pgc = malloc(sizeof(pgc_t));
  if(!ifofile->first_play_pgc)
    return 0;
  
  if(!ifoRead_PGC(ifofile, ifofile->first_play_pgc, 
                  ifofile->vmgi_mat->first_play_pgc)) {
    free(ifofile->first_play_pgc);
    ifofile->first_play_pgc = 0;
    return 0;
  }

  return 1;
}

static void ifoFree_PGC(pgc_t *pgc) {
  if(pgc) {
    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);
  }
}

void ifoFree_FP_PGC(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  if(ifofile->first_play_pgc) {
    ifoFree_PGC(ifofile->first_play_pgc);
    free(ifofile->first_play_pgc);
    ifofile->first_play_pgc = 0;
  }
}


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

  ifofile->tt_srpt = tt_srpt;
  
  if(!(DVDReadBytes(ifofile->file, tt_srpt, TT_SRPT_SIZE))) {
    if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
      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);
  
  info_length = tt_srpt->last_byte + 1 - TT_SRPT_SIZE;

  tt_srpt->title = malloc(info_length);
  if(!tt_srpt->title) {
    free(tt_srpt);
    ifofile->tt_srpt = 0;
    return 0;
  }
  if(!(DVDReadBytes(ifofile->file, tt_srpt->title, info_length))) {
    if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
      fprintf(stderr, "libdvdread: Unable to read read TT_SRPT.\n");
    }
    ifoFree_TT_SRPT(ifofile);
    return 0;
  }

  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);
  }
  

  CHECK_ZERO(tt_srpt->zero_1);
  CHECK_VALUE(tt_srpt->nr_of_srpts != 0);
  CHECK_VALUE(tt_srpt->nr_of_srpts < 100); // ??
  CHECK_VALUE(tt_srpt->nr_of_srpts * sizeof(title_info_t) <= info_length);
  
  for(i = 0; i < tt_srpt->nr_of_srpts; i++) {
    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);
  }
  
  // Make this a function
#if 0
  if(memcmp((uint8_t *)tt_srpt->title + 
            tt_srpt->nr_of_srpts * sizeof(title_info_t), 
            my_friendly_zeros, 
            info_length - tt_srpt->nr_of_srpts * sizeof(title_info_t))) {
    fprintf(stderr, "VMG_PTT_SRPT slack is != 0, ");
    hexdump((uint8_t *)tt_srpt->title + 
            tt_srpt->nr_of_srpts * sizeof(title_info_t), 
            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;
  
  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) {
  vts_ptt_srpt_t *vts_ptt_srpt;
  int info_length, i, j;
  uint32_t *data;

  if(!ifofile)
    return 0;
  
  if(!ifofile->vtsi_mat)
    return 0;

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

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

  ifofile->vts_ptt_srpt = vts_ptt_srpt;

  if(!(DVDReadBytes(ifofile->file, vts_ptt_srpt, VTS_PTT_SRPT_SIZE))) {
    if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
      fprintf(stderr, "libdvdread: Unable to read PTT search table.\n");
    }
    free(vts_ptt_srpt);
    return 0;
  }

  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); // ??
  
  info_length = vts_ptt_srpt->last_byte + 1 - VTS_PTT_SRPT_SIZE;
  
  data = malloc(info_length);
  if(!data) {
    free(vts_ptt_srpt);
    ifofile->vts_ptt_srpt = 0;
    return 0;
  }
  if(!(DVDReadBytes(ifofile->file, data, info_length))) {
    if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
      fprintf(stderr, "libdvdread: Unable to read PTT search table.\n");
    }
    free(vts_ptt_srpt);
    free(data);
    ifofile->vts_ptt_srpt = 0;
    return 0;
  }

  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);
       Magic Knight Rayearth Daybreak is mastered very strange and has 
       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);
  }
 
  vts_ptt_srpt->ttu_offset = data;
  
  vts_ptt_srpt->title = malloc(vts_ptt_srpt->nr_of_srpts * sizeof(ttu_t));
  if(!vts_ptt_srpt->title) {
    free(vts_ptt_srpt);
    free(data);
    ifofile->vts_ptt_srpt = 0;
    return 0;
  }
  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]);
    /* assert(n > 0 && (n % 4) == 0);
       Magic Knight Rayearth Daybreak is mastered very strange and has 
       Titles with 0 PTTs. */
    if(n < 0) n = 0;
    CHECK_VALUE(n % 4 == 0);
    
    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);
      free(vts_ptt_srpt);
      free(data);
      ifofile->vts_ptt_srpt = 0;
      return 0;
    }
    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);
      vts_ptt_srpt->title[i].ptt[j].pgcn 
        = *(uint16_t*)(((char *)data) + data[i] + 4*j - VTS_PTT_SRPT_SIZE);
      vts_ptt_srpt->title[i].ptt[j].pgn 
        = *(uint16_t*)(((char *)data) + data[i] + 4*j + 2 - VTS_PTT_SRPT_SIZE);
    }
  }
  
  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);
    }
  }
  
  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); // ??
    }
  }

  return 1;
}


void ifoFree_VTS_PTT_SRPT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  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;
  
  if(!ifofile->vmgi_mat)
    return 0;
  
  if(ifofile->vmgi_mat->ptl_mait == 0)
    return 1;

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

  ptl_mait = 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);
    ifofile->ptl_mait = 0;
    return 0;
  }

  B2N_16(ptl_mait->nr_of_countries);
  B2N_16(ptl_mait->nr_of_vtss);
  B2N_32(ptl_mait->last_byte);
  
  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); // ??  
  CHECK_VALUE(ptl_mait->nr_of_countries * PTL_MAIT_COUNTRY_SIZE 
              <= ptl_mait->last_byte + 1 - PTL_MAIT_SIZE);
  
  info_length = ptl_mait->nr_of_countries * sizeof(ptl_mait_country_t);
  ptl_mait->countries = malloc(info_length);
  if(!ptl_mait->countries) {
    free(ptl_mait);
    ifofile->ptl_mait = 0;
    return 0;
  }
  
  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    if(!(DVDReadBytes(ifofile->file, &ptl_mait->countries[i], PTL_MAIT_COUNTRY_SIZE))) {
      if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
        fprintf(stderr, "libdvdread: Unable to read PTL_MAIT.\n");
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      ifofile->ptl_mait = 0;
      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);
  }
  
  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    CHECK_ZERO(ptl_mait->countries[i].zero_1);
    CHECK_ZERO(ptl_mait->countries[i].zero_2);    
    CHECK_VALUE(ptl_mait->countries[i].pf_ptl_mai_start_byte +
                16U * (ptl_mait->nr_of_vtss + 1) <= ptl_mait->last_byte + 1U);
  }

  for(i = 0; i < ptl_mait->nr_of_countries; i++) {
    uint16_t *pf_temp;
    
    if(!DVDFileSeek_(ifofile->file, 
                     ifofile->vmgi_mat->ptl_mait * DVD_BLOCK_LEN
                     + ptl_mait->countries[i].pf_ptl_mai_start_byte)) {
      if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
        fprintf(stderr, "libdvdread: Unable to seak PTL_MAIT table.\n");
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    info_length = (ptl_mait->nr_of_vtss + 1) * sizeof(pf_level_t);
    pf_temp = malloc(info_length);
    if(!pf_temp) {
      for(j = 0; j < i ; j++) {
        free(ptl_mait->countries[j].pf_ptl_mai);
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    if(!(DVDReadBytes(ifofile->file, pf_temp, info_length))) {
      if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
        fprintf(stderr, "libdvdread: Unable to read PTL_MAIT table.\n");
      }
      free(pf_temp);
      for(j = 0; j < i ; j++) {
        free(ptl_mait->countries[j].pf_ptl_mai);
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    for (j = 0; j < ((ptl_mait->nr_of_vtss + 1) * 8); j++) {
      B2N_16(pf_temp[j]);
    }
    ptl_mait->countries[i].pf_ptl_mai = malloc(info_length);
    if(!ptl_mait->countries[i].pf_ptl_mai) {
      free(pf_temp);
      for(j = 0; j < i ; j++) {
        free(ptl_mait->countries[j].pf_ptl_mai);
      }
      free(ptl_mait->countries);
      free(ptl_mait);
      return 0;
    }
    { /* Transpose the array so we can use C indexing. */
      int level, vts;
      for(level = 0; level < 8; level++) {
        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];
        }
      }
      free(pf_temp);
    }
  }
  return 1;
}

void ifoFree_PTL_MAIT(ifo_handle_t *ifofile) {
  unsigned int i;
  
  if(!ifofile)
    return;
  
  if(ifofile->ptl_mait) {
    for(i = 0; i < ifofile->ptl_mait->nr_of_countries; i++) {
      free(ifofile->ptl_mait->countries[i].pf_ptl_mai);