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/*
* 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 PngChunkItxt extends PngTextChunk {
public final String keyword;
public final String text;
/*
* The language tag defined in [RFC-3066] indicates the human language used
* by the translated keyword and the text. Unlike the keyword, the language
* tag is case-insensitive. It is an ISO 646.IRV:1991 [ISO 646] string
* consisting of hyphen-separated words of 1-8 alphanumeric characters each
* (for example cn, en-uk, no-bok, x-klingon, x-KlInGoN). If the first word
* is two or three letters long, it is an ISO language code [ISO-639]. If
* the language tag is empty, the language is unspecified.
*/
public final String languageTag;
public final String translatedKeyword;
public PngChunkItxt(final int length, final int chunkType, final int crc, final byte[] bytes)
throws ImageReadException, IOException {
super(length, chunkType, crc, bytes);
int terminator = findNull(bytes);
if (terminator < 0) {
throw new ImageReadException(
"PNG iTXt chunk keyword is not terminated.");
}
keyword = new String(bytes, 0, terminator, "ISO-8859-1");
int index = terminator + 1;
final int compressionFlag = bytes[index++];
if (compressionFlag != 0 && compressionFlag != 1) {
throw new ImageReadException(
"PNG iTXt chunk has invalid compression flag: "
+ compressionFlag);
}
final boolean compressed = compressionFlag == 1;
final int compressionMethod = bytes[index++];
if (compressed && compressionMethod != PngConstants.COMPRESSION_DEFLATE_INFLATE) {
throw new ImageReadException("PNG iTXt chunk has unexpected compression method: " + compressionMethod);
}
terminator = findNull(bytes, index);
if (terminator < 0) {
throw new ImageReadException("PNG iTXt chunk language tag is not terminated.");
}
languageTag = new String(bytes, index, terminator - index, "ISO-8859-1");
index = terminator + 1;
terminator = findNull(bytes, index);
if (terminator < 0) {
throw new ImageReadException("PNG iTXt chunk translated keyword is not terminated.");
}
translatedKeyword = new String(bytes, index, terminator - index, "utf-8");
index = terminator + 1;
if (compressed) {
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))), "utf-8");
} else {
text = new String(bytes, index, bytes.length - index, "utf-8");
}
}
/**
* @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.Itxt(keyword, text, languageTag, translatedKeyword);
}
}