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 */
017
018package org.apache.commons.imaging.formats.jpeg.xmp;
019
020import java.nio.charset.StandardCharsets;
021
022import org.apache.commons.imaging.ImagingException;
023import org.apache.commons.imaging.common.BinaryFileParser;
024import org.apache.commons.imaging.formats.jpeg.JpegConstants;
025
026public class JpegXmpParser extends BinaryFileParser {
027
028    /**
029     * Constructs a new instance with the default, big-endian, byte order.
030     */
031    public JpegXmpParser() {
032        // empty
033    }
034
035    public boolean isXmpJpegSegment(final byte[] segmentData) {
036        return JpegConstants.XMP_IDENTIFIER.isStartOf(segmentData);
037    }
038
039    public String parseXmpJpegSegment(final byte[] segmentData) throws ImagingException {
040        if (!isXmpJpegSegment(segmentData)) {
041            throw new ImagingException("Invalid JPEG XMP Segment.");
042        }
043        final int index = JpegConstants.XMP_IDENTIFIER.size();
044
045        // segment data is UTF-8 encoded xml.
046        return new String(segmentData, index, segmentData.length - index, StandardCharsets.UTF_8);
047    }
048
049}