001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.imaging.formats.tiff.taginfos; 018 019import java.nio.ByteOrder; 020import java.nio.charset.StandardCharsets; 021import java.util.Arrays; 022 023import org.apache.commons.imaging.ImagingException; 024import org.apache.commons.imaging.formats.tiff.TiffField; 025import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryType; 026import org.apache.commons.imaging.formats.tiff.fieldtypes.AbstractFieldType; 027 028/** 029 * Windows XP onwards store some tags using UTF-16LE, but the field type is byte - here we deal with this. 030 */ 031public class TagInfoXpString extends TagInfo { 032 public TagInfoXpString(final String name, final int tag, final TiffDirectoryType directoryType) { 033 super(name, tag, AbstractFieldType.BYTE, LENGTH_UNKNOWN, directoryType); 034 } 035 036 @Override 037 public byte[] encodeValue(final AbstractFieldType abstractFieldType, final Object value, final ByteOrder byteOrder) throws ImagingException { 038 if (!(value instanceof String)) { 039 throw new ImagingException("Text value not String", value); 040 } 041 final String s = (String) value; 042 final byte[] bytes = s.getBytes(StandardCharsets.UTF_16LE); 043 return Arrays.copyOf(bytes, bytes.length + 2); 044 } 045 046 @Override 047 public String getValue(final TiffField entry) throws ImagingException { 048 if (entry.getFieldType() != AbstractFieldType.BYTE) { 049 throw new ImagingException("Text field not encoded as bytes."); 050 } 051 final byte[] bytes = entry.getByteArrayValue(); 052 final int length; 053 if (bytes.length >= 2 && bytes[bytes.length - 1] == 0 && bytes[bytes.length - 2] == 0) { 054 length = bytes.length - 2; 055 } else { 056 length = bytes.length; 057 } 058 return new String(bytes, 0, length, StandardCharsets.UTF_16LE); 059 } 060}