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.ImageWriteException; 023import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryType; 024import org.apache.commons.imaging.formats.tiff.fieldtypes.FieldType; 025 026public class TagInfoAscii extends TagInfo { 027 public TagInfoAscii(final String name, final int tag, final int length, 028 final TiffDirectoryType directoryType) { 029 super(name, tag, FieldType.ASCII, length, directoryType); 030 } 031 032 public String[] getValue(final ByteOrder byteOrder, final byte[] bytes) { 033 int nullCount = 0; 034 for (int i = 0; i < bytes.length - 1; i++) { 035 if (bytes[i] == 0) { 036 nullCount++; 037 } 038 } 039 final String[] strings = new String[nullCount + 1]; 040 int stringsAdded = 0; 041 strings[0] = ""; // if we have a 0 length string 042 int nextStringPos = 0; 043 // According to the Exiftool FAQ, http://www.metadataworkinggroup.org 044 // specifies that the TIFF ASCII fields are actually UTF-8. 045 // Exiftool however allows you to configure the charset used. 046 for (int i = 0; i < bytes.length; i++) { 047 if (bytes[i] == 0) { 048 final String string = new String(bytes, nextStringPos, i 049 - nextStringPos, StandardCharsets.UTF_8); 050 strings[stringsAdded++] = string; 051 nextStringPos = i + 1; 052 } 053 } 054 if (nextStringPos < bytes.length) { 055 // Buggy file, string wasn't null terminated 056 final String string = new String(bytes, nextStringPos, bytes.length 057 - nextStringPos, StandardCharsets.UTF_8); 058 strings[stringsAdded++] = string; 059 } 060 return strings; 061 } 062 063 public byte[] encodeValue(final ByteOrder byteOrder, final String... values) 064 throws ImageWriteException { 065 return FieldType.ASCII.writeData(values, byteOrder); 066 } 067}