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; 021 022import org.apache.commons.imaging.ImageReadException; 023import org.apache.commons.imaging.ImageWriteException; 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.FieldType; 027 028/** 029 * Windows XP onwards store some tags using UTF-16LE, but the field type is byte 030 * - here we deal with this. 031 */ 032public class TagInfoXpString extends TagInfo { 033 public TagInfoXpString(final String name, final int tag, final TiffDirectoryType directoryType) { 034 super(name, tag, FieldType.BYTE, LENGTH_UNKNOWN, directoryType); 035 } 036 037 @Override 038 public byte[] encodeValue(final FieldType fieldType, final Object value, final ByteOrder byteOrder) 039 throws ImageWriteException { 040 if (!(value instanceof String)) { 041 throw new ImageWriteException("Text value not String", value); 042 } 043 final String s = (String) value; 044 final byte[] bytes = s.getBytes(StandardCharsets.UTF_16LE); 045 final byte[] paddedBytes = new byte[bytes.length + 2]; 046 System.arraycopy(bytes, 0, paddedBytes, 0, bytes.length); 047 return paddedBytes; 048 } 049 050 @Override 051 public String getValue(final TiffField entry) throws ImageReadException { 052 if (entry.getFieldType() != FieldType.BYTE) { 053 throw new ImageReadException("Text field not encoded as bytes."); 054 } 055 final byte[] bytes = entry.getByteArrayValue(); 056 final int length; 057 if (bytes.length >= 2 && bytes[bytes.length - 1] == 0 && bytes[bytes.length - 2] == 0) { 058 length = bytes.length - 2; 059 } else { 060 length = bytes.length; 061 } 062 return new String(bytes, 0, length, StandardCharsets.UTF_16LE); 063 } 064}