TagInfoXpString.java
/*
* 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.tiff.taginfos;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import org.apache.commons.imaging.ImagingException;
import org.apache.commons.imaging.formats.tiff.TiffField;
import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryType;
import org.apache.commons.imaging.formats.tiff.fieldtypes.AbstractFieldType;
/**
* Windows XP onwards store some tags using UTF-16LE, but the field type is byte - here we deal with this.
*/
public class TagInfoXpString extends TagInfo {
public TagInfoXpString(final String name, final int tag, final TiffDirectoryType directoryType) {
super(name, tag, AbstractFieldType.BYTE, LENGTH_UNKNOWN, directoryType);
}
@Override
public byte[] encodeValue(final AbstractFieldType abstractFieldType, final Object value, final ByteOrder byteOrder) throws ImagingException {
if (!(value instanceof String)) {
throw new ImagingException("Text value not String", value);
}
final String s = (String) value;
final byte[] bytes = s.getBytes(StandardCharsets.UTF_16LE);
return Arrays.copyOf(bytes, bytes.length + 2);
}
@Override
public String getValue(final TiffField entry) throws ImagingException {
if (entry.getFieldType() != AbstractFieldType.BYTE) {
throw new ImagingException("Text field not encoded as bytes.");
}
final byte[] bytes = entry.getByteArrayValue();
final int length;
if (bytes.length >= 2 && bytes[bytes.length - 1] == 0 && bytes[bytes.length - 2] == 0) {
length = bytes.length - 2;
} else {
length = bytes.length;
}
return new String(bytes, 0, length, StandardCharsets.UTF_16LE);
}
}