/*
    * 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.xmp;
  
  import java.nio.ByteOrder;
  import java.nio.charset.StandardCharsets;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.BinaryFileParser;
  import org.apache.commons.imaging.common.BinaryFunctions;
  import org.apache.commons.imaging.formats.jpeg.JpegConstants;
  
  public class JpegXmpParser extends BinaryFileParser {
  
      public JpegXmpParser() {
          super(ByteOrder.BIG_ENDIAN);
      }
  
      public boolean isXmpJpegSegment(final byte[] segmentData) {
          return BinaryFunctions.startsWith(segmentData, JpegConstants.XMP_IDENTIFIER);
      }
  
      public String parseXmpJpegSegment(final byte[] segmentData) throws ImagingException {
          if (!isXmpJpegSegment(segmentData)) {
              throw new ImagingException("Invalid JPEG XMP Segment.");
          }
          final int index = JpegConstants.XMP_IDENTIFIER.size();
  
          // segment data is UTF-8 encoded xml.
          return new String(segmentData, index, segmentData.length - index, StandardCharsets.UTF_8);
      }
  
  }