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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.imaging.formats.jpeg.segments;
18  
19  import java.io.ByteArrayInputStream;
20  import java.io.IOException;
21  import java.io.InputStream;
22  import java.io.UnsupportedEncodingException;
23  
24  import static org.apache.commons.imaging.common.BinaryFunctions.*;
25  
26  /**
27   * http://www.aiim.org/documents/standards/PDF-Ref/References/Adobe/5116.DCT_Filter.pdf
28   */
29  public class App14Segment extends AppnSegment {
30      private static final byte[] ADOBE_PREFIX;
31      public static final int ADOBE_COLOR_TRANSFORM_UNKNOWN = 0;
32      public static final int ADOBE_COLOR_TRANSFORM_YCbCr = 1;
33      public static final int ADOBE_COLOR_TRANSFORM_YCCK = 2;
34      
35      static {
36          byte[] adobe = null;
37          try {
38              adobe = "Adobe".getBytes("US-ASCII");
39          } catch (final UnsupportedEncodingException cannotHappen) { // NOPMD - can't happen
40          }
41          ADOBE_PREFIX = adobe;
42      }
43  
44      public App14Segment(final int marker, final byte[] segmentData) throws IOException {
45          this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
46      }
47      
48      public App14Segment(final int marker, final int markerLength, final InputStream is) throws IOException {
49          super(marker, markerLength, is);
50      }
51  
52      public boolean isAdobeJpegSegment() {
53          return startsWith(getSegmentData(), ADOBE_PREFIX);
54      }
55  
56      public int getAdobeColorTransform() {
57          return 0xff & getSegmentData(11);
58      }
59  }