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.ImagingException; 023import org.apache.commons.imaging.common.Allocator; 024import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryType; 025import org.apache.commons.imaging.formats.tiff.fieldtypes.AbstractFieldType; 026 027public class TagInfoAscii extends TagInfo { 028 public TagInfoAscii(final String name, final int tag, final int length, final TiffDirectoryType directoryType) { 029 super(name, tag, AbstractFieldType.ASCII, length, directoryType); 030 } 031 032 public byte[] encodeValue(final ByteOrder byteOrder, final String... values) throws ImagingException { 033 return AbstractFieldType.ASCII.writeData(values, byteOrder); 034 } 035 036 public String[] getValue(final ByteOrder byteOrder, final byte[] bytes) { 037 int nullCount = 0; 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 + 1, 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 return strings; 063 } 064}