    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}