001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.imaging.formats.jpeg.segments;
018
019import static org.apache.commons.imaging.common.BinaryFunctions.startsWith;
020
021import java.io.ByteArrayInputStream;
022import java.io.IOException;
023import java.io.InputStream;
024import java.nio.charset.StandardCharsets;
025
026/**
027 * http://www.aiim.org/documents/standards/PDF-Ref/References/Adobe/5116.DCT_Filter.pdf
028 */
029public class App14Segment extends AppnSegment {
030    private static final byte[] ADOBE_PREFIX;
031    public static final int ADOBE_COLOR_TRANSFORM_UNKNOWN = 0;
032    public static final int ADOBE_COLOR_TRANSFORM_YCbCr = 1;
033    public static final int ADOBE_COLOR_TRANSFORM_YCCK = 2;
034
035    static {
036        ADOBE_PREFIX = "Adobe".getBytes(StandardCharsets.US_ASCII);
037    }
038
039    public App14Segment(final int marker, final byte[] segmentData) throws IOException {
040        this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
041    }
042
043    public App14Segment(final int marker, final int markerLength, final InputStream is) throws IOException {
044        super(marker, markerLength, is);
045    }
046
047    public boolean isAdobeJpegSegment() {
048        return startsWith(getSegmentData(), ADOBE_PREFIX);
049    }
050
051    public int getAdobeColorTransform() {
052        return 0xff & getSegmentData(11);
053    }
054}