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.adobe;
  
  import com.drew.imaging.jpeg.JpegSegmentMetadataReader;
  import com.drew.imaging.jpeg.JpegSegmentType;
  import com.drew.lang.SequentialByteArrayReader;
  import com.drew.lang.SequentialReader;
  import com.drew.lang.annotations.NotNull;
  import com.drew.metadata.Directory;
  import com.drew.metadata.Metadata;
  
  import java.io.IOException;
  import java.util.Collections;
  
  /**
   * Decodes Adobe formatted data stored in JPEG files, normally in the APPE (App14) segment.
   *
   * @author Philip
   * @author Drew Noakes https://drewnoakes.com
   */
  @SuppressWarnings("WeakerAccess")
  public class AdobeJpegReader implements JpegSegmentMetadataReader
  {
      public static final String PREAMBLE = "Adobe";
  
      @NotNull
      public Iterable<JpegSegmentType> getSegmentTypes()
      {
          return Collections.singletonList(JpegSegmentType.APPE);
      }
  
      public void readJpegSegments(@NotNull Iterable<byte[]> segments, @NotNull Metadata metadata, @NotNull JpegSegmentType segmentType)
      {
          for (byte[] bytes : segments) {
              if (bytes.length == 12 && PREAMBLE.equalsIgnoreCase(new String(bytes, 0, PREAMBLE.length())))
                  extract(new SequentialByteArrayReader(bytes), metadata);
          }
      }
  
      public void extract(@NotNull SequentialReader reader, @NotNull Metadata metadata)
      {
          Directory directory = new AdobeJpegDirectory();
          metadata.addDirectory(directory);
  
          try {
              reader.setMotorolaByteOrder(false);
  
              if (!reader.getString(PREAMBLE.length()).equals(PREAMBLE)) {
                  directory.addError("Invalid Adobe JPEG data header.");
                  return;
              }
  
              directory.setInt(AdobeJpegDirectory.TAG_DCT_ENCODE_VERSION, reader.getUInt16());
              directory.setInt(AdobeJpegDirectory.TAG_APP14_FLAGS0, reader.getUInt16());
              directory.setInt(AdobeJpegDirectory.TAG_APP14_FLAGS1, reader.getUInt16());
              directory.setInt(AdobeJpegDirectory.TAG_COLOR_TRANSFORM, reader.getInt8());
          } catch (IOException ex) {
              directory.addError("IO exception processing data: " + ex.getMessage());
          }
      }
  }
  