/*
    * 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 static org.apache.commons.imaging.common.BinaryFunctions.readAndVerifyBytes;
  import static org.apache.commons.imaging.common.BinaryFunctions.readByte;
  import static org.apache.commons.imaging.common.BinaryFunctions.readBytes;
  import static org.apache.commons.imaging.common.BinaryFunctions.startsWith;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.formats.jpeg.JpegConstants;
  
  public class App2Segment extends AppnSegment implements Comparable<App2Segment> {
      private final byte[] iccBytes;
      public final int curMarker;
      public final int numMarkers;
  
      public App2Segment(final int marker, final byte[] segmentData) throws ImagingException, IOException {
          this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
      }
  
      public App2Segment(final int marker, int markerLength, final InputStream is2) throws ImagingException, IOException {
          super(marker, markerLength, is2);
  
          if (startsWith(getSegmentData(), JpegConstants.ICC_PROFILE_LABEL)) {
              final InputStream is = new ByteArrayInputStream(getSegmentData());
  
              readAndVerifyBytes(is, JpegConstants.ICC_PROFILE_LABEL, "Not a Valid App2 Segment: missing ICC Profile label");
  
              curMarker = readByte("curMarker", is, "Not a valid App2 Marker");
              numMarkers = readByte("numMarkers", is, "Not a valid App2 Marker");
  
              markerLength -= JpegConstants.ICC_PROFILE_LABEL.size();
              markerLength -= 1 + 1;
  
              iccBytes = readBytes("App2 Data", is, markerLength, "Invalid App2 Segment: insufficient data");
          } else {
              // debugByteArray("Unknown APP2 Segment Type", bytes);
              curMarker = -1;
              numMarkers = -1;
              iccBytes = null;
          }
      }
  
      @Override
      public int compareTo(final App2Segment other) {
          return curMarker - other.curMarker;
      }
  
      @Override
      public boolean equals(final Object obj) {
          if (obj instanceof App2Segment) {
              final App2Segment other = (App2Segment) obj;
              return curMarker == other.curMarker;
          }
          return false;
      }
  
      /**
       * @return the iccBytes
       */
      public byte[] getIccBytes() {
          return iccBytes != null ? iccBytes.clone() : null;
      }
  
      @Override
      public int hashCode() {
          return curMarker;
      }
  }