org.apache.commons.imaging.formats.png.chunks.PngChunkIccp Maven / Gradle / Ivy
/*
* 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 static org.apache.commons.imaging.common.BinaryFunctions.findNull;
import static org.apache.commons.imaging.common.BinaryFunctions.getStreamBytes;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.InflaterInputStream;
import org.apache.commons.imaging.ImageReadException;
/**
* 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 http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html
*/
public class PngChunkIccp extends PngChunk {
/*
* Logger.
*/
private static final Logger LOGGER = Logger.getLogger(PngChunkIccp.class.getName());
/**
* ICC profile name.
*/
public final String profileName;
/**
* Compression method.
*/
public final int compressionMethod;
/**
* Compressed profile data.
*/
private final byte[] compressedProfile;
/**
* Uncompressed profile data.
*/
private final byte[] uncompressedProfile;
/**
* Constructor.
* @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 ImageReadException 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 ImageReadException, IOException {
super(length, chunkType, crc, bytes);
final int index = findNull(bytes);
if (index < 0) {
throw new ImageReadException("PngChunkIccp: No Profile Name");
}
final byte[] nameBytes = new byte[index];
System.arraycopy(bytes, 0, nameBytes, 0, index);
profileName = new String(nameBytes, StandardCharsets.ISO_8859_1);
compressionMethod = bytes[index + 1];
final int compressedProfileLength = bytes.length - (index + 1 + 1);
compressedProfile = new byte[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 = getStreamBytes(new InflaterInputStream(new ByteArrayInputStream(compressedProfile)));
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("UncompressedProfile: " + bytes.length);
}
}
/**
* Return a copy of the uncompressed profile data.
* @return the uncompressed profile data
*/
public byte[] getUncompressedProfile() {
return uncompressedProfile.clone();
}
}