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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.imaging.formats.tiff.taginfos;
18  
19  import java.io.UnsupportedEncodingException;
20  import java.nio.ByteOrder;
21  
22  import org.apache.commons.imaging.ImageWriteException;
23  import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryType;
24  import org.apache.commons.imaging.formats.tiff.fieldtypes.FieldType;
25  
26  public class TagInfoAscii extends TagInfo {
27      public TagInfoAscii(final String name, final int tag, final int length,
28              final TiffDirectoryType directoryType) {
29          super(name, tag, FieldType.ASCII, length, directoryType);
30      }
31  
32      public String[] getValue(final ByteOrder byteOrder, final byte[] bytes) {
33          int nullCount = 0;
34          for (int i = 0; i < bytes.length - 1; i++) {
35              if (bytes[i] == 0) {
36                  nullCount++;
37              }
38          }
39          final String[] strings = new String[nullCount + 1];
40          int stringsAdded = 0;
41          strings[0] = ""; // if we have a 0 length string
42          int nextStringPos = 0;
43          // According to the Exiftool FAQ, http://www.metadataworkinggroup.org
44          // specifies that the TIFF ASCII fields are actually UTF-8.
45          // Exiftool however allows you to configure the charset used.
46          for (int i = 0; i < bytes.length; i++) {
47              if (bytes[i] == 0) {
48                  try {
49                      final String string = new String(bytes, nextStringPos, i
50                              - nextStringPos, "UTF-8");
51                      strings[stringsAdded++] = string;
52                  } catch (final UnsupportedEncodingException unsupportedEncoding) { // NOPMD
53                  }
54                  nextStringPos = i + 1;
55              }
56          }
57          if (nextStringPos < bytes.length) {
58              // Buggy file, string wasn't null terminated
59              try {
60                  final String string = new String(bytes, nextStringPos, bytes.length
61                          - nextStringPos, "UTF-8");
62                  strings[stringsAdded++] = string;
63              } catch (final UnsupportedEncodingException unsupportedEncoding) { // NOPMD
64              }
65          }
66          return strings;
67      }
68  
69      public byte[] encodeValue(final ByteOrder byteOrder, final String... values)
70              throws ImageWriteException {
71          return FieldType.ASCII.writeData(values, byteOrder);
72      }
73  }