App2Segment.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *      http://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.
 */
package org.apache.commons.imaging.formats.jpeg.segments;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.common.BinaryFileParser;
import org.apache.commons.imaging.formats.jpeg.JpegImageParser;

public class App2Segment extends AppnSegment implements Comparable<App2Segment> {
    public final byte icc_bytes[];
    public final int cur_marker, num_markers;

    public App2Segment(final int marker, final byte segmentData[])
            throws ImageReadException, IOException {
        this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
    }

    public App2Segment(final int marker, int marker_length, final InputStream is2)
            throws ImageReadException, IOException {
        super(marker, marker_length, is2);

        if (BinaryFileParser.startsWith(bytes,
                JpegImageParser.icc_profile_label)) {
            final InputStream is = new ByteArrayInputStream(bytes);

            readAndVerifyBytes(is, JpegImageParser.icc_profile_label,
                    "Not a Valid App2 Segment: missing ICC Profile label");

            cur_marker = readByte("cur_marker", is, "Not a valid App2 Marker");
            num_markers = readByte("num_markers", is, "Not a valid App2 Marker");

            marker_length -= JpegImageParser.icc_profile_label.size();
            marker_length -= (1 + 1);

            icc_bytes = readBytes("App2 Data", is, marker_length,
                    "Invalid App2 Segment: insufficient data");
        } else {
            // debugByteArray("Unknown APP2 Segment Type", bytes);
            cur_marker = -1;
            num_markers = -1;
            icc_bytes = null;
        }
    }

    @Override
    public boolean equals(final Object obj) {
        if (obj instanceof App2Segment) {
            final App2Segment other = (App2Segment) obj;
            return cur_marker == other.cur_marker;
        }
        return false;
    }

    @Override
    public int hashCode() {
        return cur_marker;
    }

    public int compareTo(final App2Segment other) {
        return cur_marker - other.cur_marker;
    }

    // public String getDescription()
    // {
    // return "APPN (APP"
    // + (marker - JpegImageParser.JPEG_APP0)
    // + ") (" + getDescription() + ")";
    // }
}