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.ByteOrder;
021import java.nio.charset.StandardCharsets;
022
023import org.apache.commons.imaging.ImagingException;
024import org.apache.commons.imaging.common.BinaryFileParser;
025import org.apache.commons.imaging.common.BinaryFunctions;
026import org.apache.commons.imaging.formats.jpeg.JpegConstants;
027
028public class JpegXmpParser extends BinaryFileParser {
029
030    public JpegXmpParser() {
031        super(ByteOrder.BIG_ENDIAN);
032    }
033
034    public boolean isXmpJpegSegment(final byte[] segmentData) {
035        return BinaryFunctions.startsWith(segmentData, JpegConstants.XMP_IDENTIFIER);
036    }
037
038    public String parseXmpJpegSegment(final byte[] segmentData) throws ImagingException {
039        if (!isXmpJpegSegment(segmentData)) {
040            throw new ImagingException("Invalid JPEG XMP Segment.");
041        }
042        final int index = JpegConstants.XMP_IDENTIFIER.size();
043
044        // segment data is UTF-8 encoded xml.
045        return new String(segmentData, index, segmentData.length - index, StandardCharsets.UTF_8);
046    }
047
048}