org.apache.commons.imaging.formats.png.chunks.PngChunkZtxt 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 java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.zip.InflaterInputStream;
import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.formats.png.PngConstants;
import org.apache.commons.imaging.formats.png.PngText;
import static org.apache.commons.imaging.common.BinaryFunctions.*;
public class PngChunkZtxt extends PngTextChunk {
public final String keyword;
public final String text;
public PngChunkZtxt(final int length, final int chunkType, final int crc, final byte[] bytes)
throws ImageReadException, IOException {
super(length, chunkType, crc, bytes);
int index = findNull(bytes);
if (index < 0) {
throw new ImageReadException(
"PNG zTXt chunk keyword is unterminated.");
}
keyword = new String(bytes, 0, index, "ISO-8859-1");
index++;
final int compressionMethod = bytes[index++];
if (compressionMethod != PngConstants.COMPRESSION_DEFLATE_INFLATE) {
throw new ImageReadException(
"PNG zTXt chunk has unexpected compression method: "
+ compressionMethod);
}
final int compressedTextLength = bytes.length - index;
final byte[] compressedText = new byte[compressedTextLength];
System.arraycopy(bytes, index, compressedText, 0, compressedTextLength);
text = new String(getStreamBytes(new InflaterInputStream(new ByteArrayInputStream(compressedText))), "ISO-8859-1");
}
/**
* @return Returns the keyword.
*/
@Override
public String getKeyword() {
return keyword;
}
/**
* @return Returns the text.
*/
@Override
public String getText() {
return text;
}
@Override
public PngText getContents() {
return new PngText.Ztxt(keyword, text);
}
}