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.mov.metadata;
  
  import com.drew.imaging.quicktime.QuickTimeHandler;
  import com.drew.lang.SequentialByteArrayReader;
  import com.drew.lang.annotations.NotNull;
  import com.drew.lang.annotations.Nullable;
  import com.drew.metadata.Metadata;
  import com.drew.metadata.mov.QuickTimeAtomTypes;
  import com.drew.metadata.mov.QuickTimeContainerTypes;
  import com.drew.metadata.mov.QuickTimeContext;
  import com.drew.metadata.mov.QuickTimeMetadataHandler;
  import com.drew.metadata.mov.atoms.Atom;
  
  import java.io.IOException;
  
  /**
   * @author Payton Garland
   */
  public class QuickTimeDirectoryHandler extends QuickTimeMetadataHandler
  {
      @Nullable
      private String currentData;
  
      public QuickTimeDirectoryHandler(Metadata metadata)
      {
          super(metadata);
      }
  
      @Override
      protected boolean shouldAcceptAtom(@NotNull Atom atom)
      {
          return atom.type.equals(QuickTimeAtomTypes.ATOM_DATA);
      }
  
      @Override
      protected boolean shouldAcceptContainer(@NotNull Atom atom)
      {
          return QuickTimeMetadataDirectory._tagIntegerMap.containsKey(atom.type)
              || atom.type.equals(QuickTimeContainerTypes.ATOM_METADATA_LIST);
      }
  
      @Override
      protected QuickTimeHandler<?> processAtom(@NotNull Atom atom, @Nullable byte[] payload, QuickTimeContext context) throws IOException
      {
          if (payload != null) {
              SequentialByteArrayReader reader = new SequentialByteArrayReader(payload);
              if (atom.type.equals(QuickTimeAtomTypes.ATOM_DATA) && currentData != null) {
                  processData(payload, reader);
              } else {
                  currentData = new String(reader.getBytes(4));
              }
          } else {
              if (QuickTimeMetadataDirectory._tagIntegerMap.containsKey(atom.type)) {
                  currentData = atom.type;
              } else {
                  currentData = null;
              }
          }
          return this;
      }
  
      @Override
      protected void processData(@NotNull byte[] payload, @NotNull SequentialByteArrayReader reader) throws IOException
      {
          // 4 bytes: type indicator
          // 4 bytes: locale indicator
          reader.skip(8);
          String value = new String(reader.getBytes(payload.length - 8));
  
          Integer tagType = QuickTimeMetadataDirectory._tagIntegerMap.get(currentData);
          if (tagType != null) {
              directory.setString(tagType, value);
          }
      }
  
      @Override
      protected void processKeys(@NotNull SequentialByteArrayReader reader) throws IOException
      {
          // Do nothing
      }
  }
  