content: /*
   * Copyright 2002-2019 Drew Noakes and contributors
   *
   *    Licensed under the Apache License, Version 2.0 (the "License");
   *    you may not use this file except in compliance with the License.
   *    You may obtain a copy of the License at
   *
   *        https://www.apache.org/licenses/LICENSE-2.0
   *
   *    Unless required by applicable law or agreed to in writing, software
   *    distributed under the License is distributed on an "AS IS" BASIS,
   *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   *
   * More information about this project is available at:
   *
   *    https://drewnoakes.com/code/exif/
   *    https://github.com/drewnoakes/metadata-extractor
   */
  package com.drew.metadata.heif.boxes;
  
  import com.drew.lang.Charsets;
  import com.drew.lang.SequentialByteArrayReader;
  import com.drew.lang.SequentialReader;
  import com.drew.metadata.heif.HeifDirectory;
  
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * ISO/IEC 14496-12:2015 pg.81-83
   */
  public class ItemInfoBox extends FullBox
  {
      long entryCount;
      Map<Long, ItemInfoEntry> entries;
  
      public ItemInfoBox(SequentialReader reader, Box box) throws IOException
      {
          super(reader, box);
  
          if (version == 0) {
              entryCount = reader.getUInt16();
          } else {
              entryCount = reader.getUInt32();
          }
          entries = new HashMap<Long, ItemInfoEntry>();
          for (int i = 1; i <= entryCount; i++)
          {
              Box entryBox = new Box(reader);
              SequentialByteArrayReader byteReader = new SequentialByteArrayReader(reader.getBytes((int)entryBox.size - 8));
              ItemInfoEntry itemInfoEntry = new ItemInfoEntry(byteReader, entryBox);
              entries.put(itemInfoEntry.itemID, itemInfoEntry);
          }
      }
  
      public static class ItemInfoEntry extends FullBox
      {
          long itemID;
          long itemProtectionIndex;
          String itemName;
          String contentType;
          String contentEncoding;
          String extensionType;
          String itemType;
          String itemUriType;
  
          public ItemInfoEntry(SequentialReader reader, Box box) throws IOException
          {
              super(reader, box);
  
              // 4 Bytes for length, 4 Bytes for type. Reader is indexed from AFTER type but box.size INCLUDES the aforementioned 8 bytes
              int headerLength = 8;
  
              if ((version == 0) || (version == 1)) {
                  itemID = reader.getUInt16();
                  itemProtectionIndex = reader.getUInt16();
                  itemName = reader.getNullTerminatedString((int)(box.size - reader.getPosition() - headerLength), Charsets.UTF_8, false);
                  contentType = reader.getNullTerminatedString((int)(box.size - reader.getPosition() - headerLength), Charsets.UTF_8, false);
                  if (box.size - reader.getPosition() - headerLength > 0) {
                      extensionType = reader.getNullTerminatedString((int) (box.size - reader.getPosition() - headerLength), Charsets.UTF_8, false);
                  }
              }
              if (version == 1) {
                  if (box.size - 28 >= 4) {
                      contentEncoding = reader.getString(4);
                  }
              }
              if (version >= 2) {
                  if (version == 2) {
                      itemID = reader.getUInt16();
                  } else if (version == 3) {
                      itemID = reader.getUInt32();
                  }
                  itemProtectionIndex = reader.getUInt16();
                  itemType = reader.getString(4);
  
                  itemName = reader.getNullTerminatedString((int)(box.size - reader.getPosition() - headerLength), Charsets.UTF_8, false);
                  if (itemType.equals("mime")) {
                      contentType = reader.getNullTerminatedString((int)(box.size - reader.getPosition() - headerLength), Charsets.UTF_8, false);
                      if (box.size - reader.getPosition() - headerLength > 0) {
                          contentEncoding = reader.getNullTerminatedString((int)(box.size - reader.getPosition() - headerLength), Charsets.UTF_8, false);
                      }
                  } else if (itemType.equals("uri ")) {
                      itemUriType = reader.getString((int)(box.size - reader.getPosition() - headerLength));
                  }
              }
          }
  
          public String getItemType() {
              return itemType;
          }
      }
  
      public void addMetadata(HeifDirectory directory)
      {
  
      }
  
      public ItemInfoEntry getEntry(final long id) {
          return entries.get(id);
      }
  }
  