/*
    * 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.png.chunks;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.nio.charset.StandardCharsets;
  import java.util.Arrays;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  import java.util.zip.InflaterInputStream;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.Allocator;
  import org.apache.commons.imaging.common.BinaryFunctions;
  import org.apache.commons.io.IOUtils;
  
  /**
   * The PNG iCCP chunk. If "present, the image samples conform to the color space represented by the embedded ICC profile as defined by the International Color
   * Consortium".
   *
   * @see <a href="http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html">PNG Specification</a>
   */
  public class PngChunkIccp extends PngChunk {
  
      /*
       * Logger.
       */
      private static final Logger LOGGER = Logger.getLogger(PngChunkIccp.class.getName());
  
      /**
       * ICC profile name.
       */
      private final String profileName;
  
      /**
       * Compression method.
       */
      private final int compressionMethod;
  
      /**
       * Compressed profile data.
       */
      private final byte[] compressedProfile;
  
      /**
       * Uncompressed profile data.
       */
      private final byte[] uncompressedProfile;
  
      /**
       * Constructs a new instance.
       *
       * @param length    chunk length
       * @param chunkType chunk type
       * @param crc       CRC computed over the chunk type and chunk data (but not the length)
       * @param bytes     chunk data bytes
       * @throws ImagingException when no profile name is present
       * @throws IOException      when an error happens while reading the profile data
       */
      public PngChunkIccp(final int length, final int chunkType, final int crc, final byte[] bytes) throws ImagingException, IOException {
          super(length, chunkType, crc, bytes);
  
          final int index = BinaryFunctions.findNull(bytes, "PngChunkIccp: No Profile Name");
          final byte[] nameBytes = Arrays.copyOf(bytes, index);
          profileName = new String(nameBytes, StandardCharsets.ISO_8859_1);
  
          compressionMethod = bytes[index + 1];
  
          final int compressedProfileLength = bytes.length - (index + 1 + 1);
          compressedProfile = Allocator.byteArray(compressedProfileLength);
          System.arraycopy(bytes, index + 1 + 1, compressedProfile, 0, compressedProfileLength);
  
          if (LOGGER.isLoggable(Level.FINEST)) {
              LOGGER.finest("ProfileName: " + profileName);
              LOGGER.finest("ProfileName.length(): " + profileName.length());
              LOGGER.finest("CompressionMethod: " + compressionMethod);
              LOGGER.finest("CompressedProfileLength: " + compressedProfileLength);
              LOGGER.finest("bytes.length: " + bytes.length);
          }
  
          uncompressedProfile = IOUtils.toByteArray(new InflaterInputStream(new ByteArrayInputStream(compressedProfile)));
  
          if (LOGGER.isLoggable(Level.FINEST)) {
              LOGGER.finest("UncompressedProfile: " + bytes.length);
         }
     }
 
     public byte[] getCompressedProfile() {
         return compressedProfile.clone();
     }
 
     public int getCompressionMethod() {
         return compressionMethod;
     }
 
     public String getProfileName() {
         return profileName;
     }
 
     /**
      * Gets a copy of the uncompressed profile data.
      *
      * @return the uncompressed profile data
      */
     public byte[] getUncompressedProfile() {
         return uncompressedProfile.clone();
     }
 
 }