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.ByteUtil;
  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;
  import java.util.ArrayList;
  
  /**
   * @author Payton Garland
   */
  public class QuickTimeDataHandler extends QuickTimeMetadataHandler
  {
      private int currentIndex = 0;
      private ArrayList<String> keys = new ArrayList<String>();
  
      public QuickTimeDataHandler(Metadata metadata)
      {
          super(metadata);
      }
  
      @Override
      protected boolean shouldAcceptAtom(@NotNull Atom atom)
      {
          return atom.type.equals(QuickTimeAtomTypes.ATOM_HANDLER)
              || atom.type.equals(QuickTimeAtomTypes.ATOM_KEYS)
              || atom.type.equals(QuickTimeAtomTypes.ATOM_DATA);
      }
  
      @Override
      protected boolean shouldAcceptContainer(@NotNull Atom atom)
      {
          return atom.type.equals(QuickTimeContainerTypes.ATOM_METADATA_LIST)
              || ByteUtil.getInt32(atom.type.getBytes(), 0, true) <= keys.size();
      }
  
      @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_KEYS)) {
                  processKeys(reader);
              } else if (atom.type.equals(QuickTimeAtomTypes.ATOM_DATA)) {
                  processData(payload, reader);
              }
          } else {
              int numValue = ByteUtil.getInt32(atom.type.getBytes(), 0, true);
              if (numValue > 0 && numValue < keys.size() + 1) {
                  currentIndex = numValue - 1;
              }
          }
          return this;
      }
  
      @Override
      protected void processKeys(@NotNull SequentialByteArrayReader reader) throws IOException
      {
          // Version 1-byte and Flags 3-bytes
          reader.skip(4);
          int entryCount = reader.getInt32();
          for (int i = 0; i < entryCount; i++) {
              int keySize = reader.getInt32();
              if (keySize < 8) {
                  directory.addError("Key size too small: " + keySize);
                  break;
              }
              reader.skip(4); // key namespace
              String keyValue = reader.getString(keySize - 8, "UTF-8");
              keys.add(keyValue);
          }
      }
  
      @Override
      protected void processData(@NotNull byte[] payload, @NotNull SequentialByteArrayReader reader) throws IOException
      {
          if (currentIndex >= keys.size()) {
              return;
          }
  
          int type = reader.getInt32();
          // 4 bytes: locale indicator
          reader.skip(4);
          Integer tag = QuickTimeMetadataDirectory._tagIntegerMap.get(keys.get(currentIndex));
          if (tag != null) {
              int length = payload.length - 8;
              switch (type) {
                  case 1:
                      directory.setString(tag, reader.getString(length, "UTF-8"));
                      break;
                  case 13:
                  case 14:
                  case 27:
                      directory.setByteArray(tag, reader.getBytes(length));
                      break;
                  case 22:
                      byte[] buf = new byte[4];
                      reader.getBytes(buf, 4 - length, length);
                      directory.setInt(tag, new SequentialByteArrayReader(buf).getInt32());
                      break;
                  case 23:
                      directory.setFloat(tag, reader.getFloat32());
                      break;
                  case 30:
                      int[] value = new int[length / 4];
                      for (int i = 0; i < value.length; i++) {
                          value[i] = reader.getInt32();
                      }
                      directory.setIntArray(tag, value);
                      break;
              }
          }
      }
  }
  