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.fieldtypes; 018 019import java.nio.ByteOrder; 020import java.nio.charset.StandardCharsets; 021 022import org.apache.commons.imaging.ImageWriteException; 023import org.apache.commons.imaging.formats.tiff.TiffField; 024 025public class FieldTypeAscii extends FieldType { 026 public FieldTypeAscii(final int type, final String name) { 027 super(type, name, 1); 028 } 029 030 @Override 031 public Object getValue(final TiffField entry) { 032 // According to EXIF specification 033 // "2 = ASCII An 8-bit byte containing one 7-bit ASCII code. The final byte is terminated with NULL." 034 final byte[] bytes = entry.getByteArrayValue(); 035 int nullCount = 1; 036 for (int i = 0; i < bytes.length - 1; i++) { 037 if (bytes[i] == 0) { 038 nullCount++; 039 } 040 } 041 final String[] strings = new String[nullCount]; 042 int stringsAdded = 0; 043 strings[0] = ""; // if we have a 0 length string 044 int nextStringPos = 0; 045 // According to the Exiftool FAQ, http://www.metadataworkinggroup.org 046 // specifies that the TIFF ASCII fields are actually UTF-8. 047 // Exiftool however allows you to configure the charset used. 048 for (int i = 0; i < bytes.length; i++) { 049 if (bytes[i] == 0) { 050 final String string = new String(bytes, nextStringPos, i 051 - nextStringPos, StandardCharsets.UTF_8); 052 strings[stringsAdded++] = string; 053 nextStringPos = i + 1; 054 } 055 } 056 if (nextStringPos < bytes.length) { 057 // Buggy file, string wasn't null terminated 058 final String string = new String(bytes, nextStringPos, bytes.length 059 - nextStringPos, StandardCharsets.UTF_8); 060 strings[stringsAdded++] = string; 061 } 062 if (strings.length == 1) { 063 return strings[0]; 064 } 065 return strings; 066 } 067 068 @Override 069 public byte[] writeData(final Object o, final ByteOrder byteOrder) throws ImageWriteException { 070 if (o instanceof byte[]) { 071 final byte[] bytes = (byte[]) o; 072 final byte[] result = new byte[bytes.length + 1]; 073 System.arraycopy(bytes, 0, result, 0, bytes.length); 074 result[result.length - 1] = 0; 075 return result; 076 } 077 if (o instanceof String) { 078 final byte[] bytes = ((String) o).getBytes(StandardCharsets.UTF_8); 079 final byte[] result = new byte[bytes.length + 1]; 080 System.arraycopy(bytes, 0, result, 0, bytes.length); 081 result[result.length - 1] = 0; 082 return result; 083 } 084 if (!(o instanceof String[])) { 085 throw new ImageWriteException("Unknown data type: " + o); 086 } 087 final String[] strings = (String[]) o; 088 int totalLength = 0; 089 for (final String string : strings) { 090 final byte[] bytes = string.getBytes(StandardCharsets.UTF_8); 091 totalLength += (bytes.length + 1); 092 } 093 final byte[] result = new byte[totalLength]; 094 int position = 0; 095 for (final String string : strings) { 096 final byte[] bytes = string.getBytes(StandardCharsets.UTF_8); 097 System.arraycopy(bytes, 0, result, position, bytes.length); 098 position += (bytes.length + 1); 099 } 100 return result; 101 } 102 103}