ifo_read.c

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  if(!(DVDReadBytes(ifofile->file, pgcit, PGCIT_SIZE)))
    return 0;

  B2N_16(pgcit->nr_of_pgci_srp);
  B2N_32(pgcit->last_byte);
  
  CHECK_ZERO(pgcit->zero_1);
  /* assert(pgcit->nr_of_pgci_srp != 0);
     Magic Knight Rayearth Daybreak is mastered very strange and has 
     Titles with 0 PTTs. */
  CHECK_VALUE(pgcit->nr_of_pgci_srp < 10000); // ?? seen max of 1338
  
  info_length = pgcit->nr_of_pgci_srp * PGCI_SRP_SIZE;
  data = malloc(info_length);
  if(!data)
    return 0;

  if(info_length && !(DVDReadBytes(ifofile->file, data, info_length))) {
    free(data);
    return 0;
  }

  pgcit->pgci_srp = malloc(pgcit->nr_of_pgci_srp * sizeof(pgci_srp_t));
  if(!pgcit->pgci_srp) {
    free(data);
    return 0;
  }
  ptr = data;
  for(i = 0; i < pgcit->nr_of_pgci_srp; i++) {
    memcpy(&pgcit->pgci_srp[i], ptr, PGCI_SRP_SIZE);
    ptr += PGCI_SRP_SIZE;
    B2N_16(pgcit->pgci_srp[i].ptl_id_mask);
    B2N_32(pgcit->pgci_srp[i].pgc_start_byte);
    CHECK_VALUE(pgcit->pgci_srp[i].unknown1 == 0);
  }
  free(data);
  
  for(i = 0; i < pgcit->nr_of_pgci_srp; i++)
    CHECK_VALUE(pgcit->pgci_srp[i].pgc_start_byte + PGC_SIZE <= pgcit->last_byte+1);
  
  for(i = 0; i < pgcit->nr_of_pgci_srp; i++) {
    pgcit->pgci_srp[i].pgc = malloc(sizeof(pgc_t));
    if(!pgcit->pgci_srp[i].pgc) {
      int j;
      for(j = 0; j < i; j++) {
        ifoFree_PGC(pgcit->pgci_srp[j].pgc);
        free(pgcit->pgci_srp[j].pgc);
      }
      free(pgcit->pgci_srp);
      pgcit->pgci_srp = NULL;
      return 0;
    }
    if(!ifoRead_PGC(ifofile, pgcit->pgci_srp[i].pgc, 
                    offset + pgcit->pgci_srp[i].pgc_start_byte)) {
      int j;
      for(j = 0; j < i; j++) {
        ifoFree_PGC(pgcit->pgci_srp[j].pgc);
        free(pgcit->pgci_srp[j].pgc);
      }
      free(pgcit->pgci_srp);
      pgcit->pgci_srp = NULL;
      return 0;
    }
  }

  return 1;
}

static void ifoFree_PGCIT_internal(pgcit_t *pgcit) {
  if(pgcit) {
    int i;
    for(i = 0; i < pgcit->nr_of_pgci_srp; i++) {
      ifoFree_PGC(pgcit->pgci_srp[i].pgc);
      free(pgcit->pgci_srp[i].pgc);
    }
    free(pgcit->pgci_srp);
  }
}

void ifoFree_PGCIT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  if(ifofile->vts_pgcit) {
    ifoFree_PGCIT_internal(ifofile->vts_pgcit);
    free(ifofile->vts_pgcit);
    ifofile->vts_pgcit = 0;
  }
}


int ifoRead_PGCI_UT(ifo_handle_t *ifofile) {
  pgci_ut_t *pgci_ut;
  unsigned int sector;
  unsigned int i;  
  int info_length;
  uint8_t *data, *ptr;

  if(!ifofile)
    return 0;
  
  if(ifofile->vmgi_mat) {
    if(ifofile->vmgi_mat->vmgm_pgci_ut == 0)
      return 1;
    sector = ifofile->vmgi_mat->vmgm_pgci_ut;
  } else if(ifofile->vtsi_mat) {
    if(ifofile->vtsi_mat->vtsm_pgci_ut == 0)
      return 1;
    sector = ifofile->vtsi_mat->vtsm_pgci_ut;
  } else {
    return 0;
  }
  
  ifofile->pgci_ut = malloc(sizeof(pgci_ut_t));
  if(!ifofile->pgci_ut)
    return 0;
  
  if(!DVDFileSeek_(ifofile->file, sector * DVD_BLOCK_LEN)) {
    free(ifofile->pgci_ut);
    ifofile->pgci_ut = 0;
    return 0;
  }
  
  if(!(DVDReadBytes(ifofile->file, ifofile->pgci_ut, PGCI_UT_SIZE))) {
    free(ifofile->pgci_ut);
    ifofile->pgci_ut = 0;
    return 0;
  }
  
  pgci_ut = ifofile->pgci_ut;
  
  B2N_16(pgci_ut->nr_of_lus);
  B2N_32(pgci_ut->last_byte);
  
  CHECK_ZERO(pgci_ut->zero_1);
  CHECK_VALUE(pgci_ut->nr_of_lus != 0);
  CHECK_VALUE(pgci_ut->nr_of_lus < 100); // ?? 3-4 ?
  CHECK_VALUE((uint32_t)pgci_ut->nr_of_lus * PGCI_LU_SIZE < pgci_ut->last_byte);

  info_length = pgci_ut->nr_of_lus * PGCI_LU_SIZE;
  data = malloc(info_length);
  if(!data) {
    free(pgci_ut);
    ifofile->pgci_ut = 0;
    return 0;
  }
  if(!(DVDReadBytes(ifofile->file, data, info_length))) {
    free(data);
    free(pgci_ut);
    ifofile->pgci_ut = 0;
    return 0;
  }

  pgci_ut->lu = malloc(pgci_ut->nr_of_lus * sizeof(pgci_lu_t));
  if(!pgci_ut->lu) {
    free(data);
    free(pgci_ut);
    ifofile->pgci_ut = 0;
    return 0;
  }
  ptr = data;
  for(i = 0; i < pgci_ut->nr_of_lus; i++) {
    memcpy(&pgci_ut->lu[i], ptr, PGCI_LU_SIZE);
    ptr += PGCI_LU_SIZE;
    B2N_16(pgci_ut->lu[i].lang_code); 
    B2N_32(pgci_ut->lu[i].lang_start_byte); 
  }
  free(data);
  
  for(i = 0; i < pgci_ut->nr_of_lus; i++) {
    // Maybe this is only defined for v1.1 and later titles?
    /* If the bits in 'lu[i].exists' are enumerated abcd efgh then:
       VTS_x_yy.IFO        VIDEO_TS.IFO
       a == 0x83 "Root"         0x82 "Title"
       b == 0x84 "Subpicture"
       c == 0x85 "Audio"
       d == 0x86 "Angle"
       e == 0x87 "PTT"
    */
    CHECK_VALUE((pgci_ut->lu[i].exists & 0x07) == 0);
  }

  for(i = 0; i < pgci_ut->nr_of_lus; i++) {
    pgci_ut->lu[i].pgcit = malloc(sizeof(pgcit_t));
    if(!pgci_ut->lu[i].pgcit) {
      unsigned int j;
      for(j = 0; j < i; j++) {
        ifoFree_PGCIT_internal(pgci_ut->lu[j].pgcit);
        free(pgci_ut->lu[j].pgcit);
      }
      free(pgci_ut->lu);
      free(pgci_ut);
      ifofile->pgci_ut = 0;
      return 0;
    }
    if(!ifoRead_PGCIT_internal(ifofile, pgci_ut->lu[i].pgcit, 
                               sector * DVD_BLOCK_LEN 
                               + pgci_ut->lu[i].lang_start_byte)) {
      unsigned int j;
      for(j = 0; j < i; j++) {
        ifoFree_PGCIT_internal(pgci_ut->lu[j].pgcit);
        free(pgci_ut->lu[j].pgcit);
      }
      free(pgci_ut->lu[i].pgcit);
      free(pgci_ut->lu);
      free(pgci_ut);
      ifofile->pgci_ut = 0;
      return 0;
    }
    // FIXME: Iterate and verify that all menus that should exists accordingly
    //        to pgci_ut->lu[i].exists really do?
  }

  return 1;
}


void ifoFree_PGCI_UT(ifo_handle_t *ifofile) {
  unsigned int i;

  if(!ifofile)
    return;
  
  if(ifofile->pgci_ut) {
    for(i = 0; i < ifofile->pgci_ut->nr_of_lus; i++) {
      ifoFree_PGCIT_internal(ifofile->pgci_ut->lu[i].pgcit);
      free(ifofile->pgci_ut->lu[i].pgcit);
    }
    free(ifofile->pgci_ut->lu);
    free(ifofile->pgci_ut);
    ifofile->pgci_ut = 0;
  }
}

static int ifoRead_VTS_ATTRIBUTES(ifo_handle_t *ifofile, 
                                  vts_attributes_t *vts_attributes, 
                                  unsigned int offset) {
  unsigned int i;

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

  if(!(DVDReadBytes(ifofile->file, vts_attributes, sizeof(vts_attributes_t))))
    return 0;

  B2N_32(vts_attributes->last_byte);
  B2N_32(vts_attributes->vts_cat);
  B2N_16(vts_attributes->vtsm_audio_attr.lang_code);
  B2N_16(vts_attributes->vtsm_subp_attr.lang_code);
  for(i = 0; i < 8; i++)
    B2N_16(vts_attributes->vtstt_audio_attr[i].lang_code);
  for(i = 0; i < 32; i++)
    B2N_16(vts_attributes->vtstt_subp_attr[i].lang_code);
  
  CHECK_ZERO(vts_attributes->zero_1);
  CHECK_ZERO(vts_attributes->zero_2);
  CHECK_ZERO(vts_attributes->zero_3);
  CHECK_ZERO(vts_attributes->zero_4);
  CHECK_ZERO(vts_attributes->zero_5);
  CHECK_ZERO(vts_attributes->zero_6);
  CHECK_ZERO(vts_attributes->zero_7);
  CHECK_VALUE(vts_attributes->nr_of_vtsm_audio_streams <= 1);
  CHECK_VALUE(vts_attributes->nr_of_vtsm_subp_streams <= 1);
  CHECK_VALUE(vts_attributes->nr_of_vtstt_audio_streams <= 8);
  for(i = vts_attributes->nr_of_vtstt_audio_streams; i < 8; i++)
    CHECK_ZERO(vts_attributes->vtstt_audio_attr[i]);
  CHECK_VALUE(vts_attributes->nr_of_vtstt_subp_streams <= 32);
  {
    unsigned int nr_coded;
    CHECK_VALUE(vts_attributes->last_byte + 1 >= VTS_ATTRIBUTES_MIN_SIZE);  
    nr_coded = (vts_attributes->last_byte + 1 - VTS_ATTRIBUTES_MIN_SIZE)/6;
    // This is often nr_coded = 70, how do you know how many there really are?
    if(nr_coded > 32) { // We haven't read more from disk/file anyway
      nr_coded = 32;
    }
    CHECK_VALUE(vts_attributes->nr_of_vtstt_subp_streams <= nr_coded);
    for(i = vts_attributes->nr_of_vtstt_subp_streams; i < nr_coded; i++)
      CHECK_ZERO(vts_attributes->vtstt_subp_attr[i]);
  }

  return 1;
}



int ifoRead_VTS_ATRT(ifo_handle_t *ifofile) {
  vts_atrt_t *vts_atrt;
  unsigned int i, info_length, sector;
  uint32_t *data;

  if(!ifofile)
    return 0;
  
  if(!ifofile->vmgi_mat)
    return 0;
  
  if(ifofile->vmgi_mat->vts_atrt == 0) /* mandatory */
    return 0;
  
  sector = ifofile->vmgi_mat->vts_atrt;
  if(!DVDFileSeek_(ifofile->file, sector * DVD_BLOCK_LEN))
    return 0;

  vts_atrt = malloc(sizeof(vts_atrt_t));
  if(!vts_atrt)
    return 0;

  ifofile->vts_atrt = vts_atrt;
  
  if(!(DVDReadBytes(ifofile->file, vts_atrt, VTS_ATRT_SIZE))) {
    free(vts_atrt);
    ifofile->vts_atrt = 0;
    return 0;
  }

  B2N_16(vts_atrt->nr_of_vtss);
  B2N_32(vts_atrt->last_byte);

  CHECK_ZERO(vts_atrt->zero_1);
  CHECK_VALUE(vts_atrt->nr_of_vtss != 0);
  CHECK_VALUE(vts_atrt->nr_of_vtss < 100); //??
  CHECK_VALUE((uint32_t)vts_atrt->nr_of_vtss * (4 + VTS_ATTRIBUTES_MIN_SIZE) + 
              VTS_ATRT_SIZE < vts_atrt->last_byte + 1);

  info_length = vts_atrt->nr_of_vtss * sizeof(uint32_t);
  data = malloc(info_length);
  if(!data) {
    free(vts_atrt);
    ifofile->vts_atrt = 0;
    return 0;
  }

  vts_atrt->vts_atrt_offsets = data;   

  if(!(DVDReadBytes(ifofile->file, data, info_length))) {
    free(data);
    free(vts_atrt);
    ifofile->vts_atrt = 0;
    return 0;
  }
  
  for(i = 0; i < vts_atrt->nr_of_vtss; i++) {
    B2N_32(data[i]);
    CHECK_VALUE(data[i] + VTS_ATTRIBUTES_MIN_SIZE < vts_atrt->last_byte + 1);
  }
  
  info_length = vts_atrt->nr_of_vtss * sizeof(vts_attributes_t);
  vts_atrt->vts = malloc(info_length);
  if(!vts_atrt->vts) {
    free(data);
    free(vts_atrt);
    ifofile->vts_atrt = 0;
    return 0;
  }
  for(i = 0; i < vts_atrt->nr_of_vtss; i++) {
    unsigned int offset = data[i];
    if(!ifoRead_VTS_ATTRIBUTES(ifofile, &(vts_atrt->vts[i]),
                               (sector * DVD_BLOCK_LEN) + offset)) {
      free(data);
      free(vts_atrt);
      ifofile->vts_atrt = 0;
      return 0;
    }

    // This assert cant be in ifoRead_VTS_ATTRIBUTES
    CHECK_VALUE(offset + vts_atrt->vts[i].last_byte <= vts_atrt->last_byte + 1);
    // Is this check correct?
  }

  return 1;
}


void ifoFree_VTS_ATRT(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  if(ifofile->vts_atrt) {
    free(ifofile->vts_atrt->vts);
    free(ifofile->vts_atrt->vts_atrt_offsets);
    free(ifofile->vts_atrt);
    ifofile->vts_atrt = 0;
  }
}


int ifoRead_TXTDT_MGI(ifo_handle_t *ifofile) {
  txtdt_mgi_t *txtdt_mgi;

  if(!ifofile)
    return 0;
  
  if(!ifofile->vmgi_mat)
    return 0;
 
  /* Return successfully if there is nothing to read. */ 
  if(ifofile->vmgi_mat->txtdt_mgi == 0)
    return 1;

  if(!DVDFileSeek_(ifofile->file, 
                   ifofile->vmgi_mat->txtdt_mgi * DVD_BLOCK_LEN))
    return 0;
  
  txtdt_mgi = malloc(sizeof(txtdt_mgi_t));
  if(!txtdt_mgi) {
    return 0;
  }
  ifofile->txtdt_mgi = txtdt_mgi;

  if(!(DVDReadBytes(ifofile->file, txtdt_mgi, TXTDT_MGI_SIZE))) {
    if(dvdread_verbose(device_of_file(ifofile->file)) >= 1) {
      fprintf(stderr, "libdvdread: Unable to read TXTDT_MGI.\n");
    }
    free(txtdt_mgi);
    ifofile->txtdt_mgi = 0;
    return 0;
  }

  // fprintf(stderr, "-- Not done yet --\n");
  return 1;
}

void ifoFree_TXTDT_MGI(ifo_handle_t *ifofile) {
  if(!ifofile)
    return;
  
  if(ifofile->txtdt_mgi) {
    free(ifofile->txtdt_mgi);
    ifofile->txtdt_mgi = 0;
  }
}