    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.ImageReadException;
    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        setByteOrder(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)
    039            throws ImageReadException {
    040        if (!isXmpJpegSegment(segmentData)) {
    041            throw new ImageReadException("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}