ifo_read.c

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  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);
  CHECK_ZERO(vmgi_mat->zero_10);  
  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);
  CHECK_VALUE(vmgi_mat->vmgi_last_byte / DVD_BLOCK_LEN <= 
              vmgi_mat->vmgi_last_sector);
  /* It seems that first_play_pgc is optional. */
  CHECK_VALUE(vmgi_mat->first_play_pgc < vmgi_mat->vmgi_last_byte);
  CHECK_VALUE(vmgi_mat->vmgm_vobs == 0 || 
              (vmgi_mat->vmgm_vobs > vmgi_mat->vmgi_last_sector &&
               vmgi_mat->vmgm_vobs < vmgi_mat->vmg_last_sector));
  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 = malloc(sizeof(vtsi_mat_t));
  if(!vtsi_mat)
    return 0;
  
  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;
  }

  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);
  B2N_16(vtsi_mat->vtsm_audio_attr.lang_code);
  B2N_16(vtsi_mat->vtsm_subp_attr.lang_code);
  for(i = 0; i < 8; i++)
    B2N_16(vtsi_mat->vts_audio_attr[i].lang_code);
  for(i = 0; i < 32; i++)
    B2N_16(vtsi_mat->vts_subp_attr[i].lang_code);


  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);
  CHECK_VALUE(vtsi_mat->vtsm_vobs == 0 || 
              (vtsi_mat->vtsm_vobs > vtsi_mat->vtsi_last_sector &&
               vtsi_mat->vtsm_vobs < vtsi_mat->vts_last_sector));
  CHECK_VALUE(vtsi_mat->vtstt_vobs == 0 || 
              (vtsi_mat->vtstt_vobs > vtsi_mat->vtsi_last_sector &&
               vtsi_mat->vtstt_vobs < vtsi_mat->vts_last_sector));
  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);
  
  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++)
    CHECK_ZERO(vtsi_mat->vts_subp_attr[i]);      
  
  for(i = 0; i < 8; 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);
  }
  
  return 1;
}


static int ifoRead_PGC_COMMAND_TBL(ifo_handle_t *ifofile, 
                                   pgc_command_tbl_t *cmd_tbl, 
                                   unsigned int offset) {
  unsigned int total;

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

  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);
  B2N_16(cmd_tbl->last_byte);
  
  total = cmd_tbl->nr_of_pre + cmd_tbl->nr_of_post + cmd_tbl->nr_of_cell;
  CHECK_VALUE(PGC_COMMAND_TBL_SIZE + total * COMMAND_DATA_SIZE 
              <= cmd_tbl->last_byte + 1U);
  CHECK_VALUE(total <= 255);

  if(cmd_tbl->nr_of_pre != 0) {
    unsigned int pre_cmds_size  = cmd_tbl->nr_of_pre * COMMAND_DATA_SIZE;
    cmd_tbl->pre_cmds = 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;
    }
  }

  if(cmd_tbl->nr_of_post != 0) {
    unsigned int post_cmds_size = cmd_tbl->nr_of_post * COMMAND_DATA_SIZE;
    cmd_tbl->post_cmds = malloc(post_cmds_size);
    if(!cmd_tbl->post_cmds) {
      if(cmd_tbl->pre_cmds) 
        free(cmd_tbl->pre_cmds);
      return 0;
    }
    if(!(DVDReadBytes(ifofile->file, cmd_tbl->post_cmds, post_cmds_size))) {
      if(cmd_tbl->pre_cmds) 
        free(cmd_tbl->pre_cmds);
      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 = malloc(cell_cmds_size);
    if(!cmd_tbl->cell_cmds) {
      if(cmd_tbl->pre_cmds)
        free(cmd_tbl->pre_cmds);
      if(cmd_tbl->post_cmds)
        free(cmd_tbl->post_cmds);
      return 0;
    }
    if(!(DVDReadBytes(ifofile->file, cmd_tbl->cell_cmds, cell_cmds_size))) {
      if(cmd_tbl->pre_cmds) 
        free(cmd_tbl->pre_cmds);
      if(cmd_tbl->post_cmds) 
        free(cmd_tbl->post_cmds);
      free(cmd_tbl->cell_cmds);
      return 0;
    }
  }
  
  /* 
   * 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);
  }
}

static int ifoRead_PGC_PROGRAM_MAP(ifo_handle_t *ifofile, 
                                   pgc_program_map_t *program_map, 
                                   unsigned int nr, unsigned int offset) {
  unsigned int size = nr * sizeof(pgc_program_map_t);

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

  return 1;
}

static int ifoRead_CELL_PLAYBACK_TBL(ifo_handle_t *ifofile, 
                                     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++) {
    B2N_32(cell_playback[i].first_sector);
    B2N_32(cell_playback[i].first_ilvu_end_sector);
    B2N_32(cell_playback[i].last_vobu_start_sector);
    B2N_32(cell_playback[i].last_sector);
    
    /* Changed < to <= because this was false in the movie 'Pi'. */
    CHECK_VALUE(cell_playback[i].last_vobu_start_sector <= 
                cell_playback[i].last_sector);
    CHECK_VALUE(cell_playback[i].first_sector <= 
                cell_playback[i].last_vobu_start_sector);
  }

  return 1;
}


static int ifoRead_CELL_POSITION_TBL(ifo_handle_t *ifofile, 
                                     cell_position_t *cell_position, 
                                     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;
 
  if(!(DVDReadBytes(ifofile->file, pgc, PGC_SIZE)))
    return 0;

  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 < 16; i++)
    B2N_32(pgc->palette[i]);
  
  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++)
    if(!pgc->audio_control[i].present)
      CHECK_ZERO(pgc->audio_control[i]);
  for(i = 0; i < 32; i++)
    if(!pgc->subp_control[i].present)
      CHECK_ZERO(pgc->subp_control[i]);
  
  /* 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);
  }
  
  if(pgc->command_tbl_offset != 0) {
    pgc->command_tbl = malloc(sizeof(pgc_command_tbl_t));
    if(!pgc->command_tbl)
      return 0;

    if(!ifoRead_PGC_COMMAND_TBL(ifofile, pgc->command_tbl, 
                                offset + pgc->command_tbl_offset)) {
      free(pgc->command_tbl);
      return 0;
    }
  } else {
    pgc->command_tbl = NULL;
  }
  
  if(pgc->program_map_offset != 0) {
    if(pgc->nr_of_programs != 0) {

    pgc->program_map = malloc(pgc->nr_of_programs * sizeof(pgc_program_map_t));
    if(!pgc->program_map) {
      ifoFree_PGC_COMMAND_TBL(pgc->command_tbl);
      return 0;
    }
    if(!ifoRead_PGC_PROGRAM_MAP(ifofile, pgc->program_map,pgc->nr_of_programs,
                                offset + pgc->program_map_offset)) {
      ifoFree_PGC_COMMAND_TBL(pgc->command_tbl);
      free(pgc->program_map);
      return 0;
    }
    } else {
      pgc->program_map = NULL;
    }
  } else {
    pgc->program_map = NULL;
  }
  
  if(pgc->cell_playback_offset != 0) {
    if(pgc->nr_of_cells != 0) {

    pgc->cell_playback = malloc(pgc->nr_of_cells * sizeof(cell_playback_t));
    if(!pgc->cell_playback) {
      ifoFree_PGC_COMMAND_TBL(pgc->command_tbl);
      if(pgc->program_map)
        free(pgc->program_map);
      return 0;
    }
    if(!ifoRead_CELL_PLAYBACK_TBL(ifofile, pgc->cell_playback, 
                                  pgc->nr_of_cells,
                                  offset + pgc->cell_playback_offset)) {
      ifoFree_PGC_COMMAND_TBL(pgc->command_tbl);
      if(pgc->program_map)
        free(pgc->program_map);
      free(pgc->cell_playback);
      return 0;
    }
    } else {
      pgc->cell_playback = NULL;
    }
  } else {
    pgc->cell_playback = NULL;
  }
  
  if(pgc->cell_position_offset != 0) {
    if(pgc->nr_of_cells != 0) {

    pgc->cell_position = malloc(pgc->nr_of_cells * sizeof(cell_position_t));
    if(!pgc->cell_position) {
      ifoFree_PGC(pgc);
      return 0;
    }
    if(!ifoRead_CELL_POSITION_TBL(ifofile, pgc->cell_position, 
                                  pgc->nr_of_cells,
                                  offset + pgc->cell_position_offset)) {
      ifoFree_PGC(pgc);
      return 0;
    }
    } else {
      pgc->cell_position = NULL;
    }
  } else {
    pgc->cell_position = NULL;
  }

  return 1;
}

int ifoRead_FP_PGC(ifo_handle_t *ifofile) {

  if(!ifofile)
    return 0;