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; 021import java.util.Arrays; 022 023import org.apache.commons.imaging.ImagingException; 024import org.apache.commons.imaging.common.Allocator; 025import org.apache.commons.imaging.formats.tiff.TiffField; 026 027public class FieldTypeAscii extends AbstractFieldType { 028 public FieldTypeAscii(final int type, final String name) { 029 super(type, name, 1); 030 } 031 032 @Override 033 public Object getValue(final TiffField entry) { 034 // According to EXIF specification 035 // "2 = ASCII An 8-bit byte containing one 7-bit ASCII code. The final byte is terminated with NULL." 036 final byte[] bytes = entry.getByteArrayValue(); 037 int nullCount = 1; 038 for (int i = 0; i < bytes.length - 1; i++) { 039 if (bytes[i] == 0) { 040 nullCount++; 041 } 042 } 043 final String[] strings = Allocator.array(nullCount, String[]::new, 24); 044 int stringsAdded = 0; 045 strings[0] = ""; // if we have a 0 length string 046 int nextStringPos = 0; 047 // According to the Exiftool FAQ, [BROKEN URL] http://www.metadataworkinggroup.org 048 // specifies that the TIFF ASCII fields are actually UTF-8. 049 // Exiftool however allows you to configure the charset used. 050 for (int i = 0; i < bytes.length; i++) { 051 if (bytes[i] == 0) { 052 final String string = new String(bytes, nextStringPos, i - nextStringPos, StandardCharsets.UTF_8); 053 strings[stringsAdded++] = string; 054 nextStringPos = i + 1; 055 } 056 } 057 if (nextStringPos < bytes.length) { 058 // Buggy file, string wasn't null terminated 059 final String string = new String(bytes, nextStringPos, bytes.length - 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 ImagingException { 070 if (o instanceof byte[]) { 071 final byte[] bytes = (byte[]) o; 072 final byte[] result = Arrays.copyOf(bytes, bytes.length + 1); 073 result[result.length - 1] = 0; 074 return result; 075 } 076 if (o instanceof String) { 077 final byte[] bytes = ((String) o).getBytes(StandardCharsets.UTF_8); 078 final byte[] result = Arrays.copyOf(bytes, bytes.length + 1); 079 result[result.length - 1] = 0; 080 return result; 081 } 082 if (!(o instanceof String[])) { 083 throw new ImagingException("Unknown data type: " + o); 084 } 085 final String[] strings = (String[]) o; 086 int totalLength = 0; 087 for (final String string : strings) { 088 final byte[] bytes = string.getBytes(StandardCharsets.UTF_8); 089 totalLength += bytes.length + 1; 090 } 091 final byte[] result = Allocator.byteArray(totalLength); 092 int position = 0; 093 for (final String string : strings) { 094 final byte[] bytes = string.getBytes(StandardCharsets.UTF_8); 095 System.arraycopy(bytes, 0, result, position, bytes.length); 096 position += bytes.length + 1; 097 } 098 return result; 099 } 100 101}