TagInfoAscii.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.imaging.formats.tiff.taginfos;
import java.nio.ByteOrder;
import java.nio.charset.StandardCharsets;
import org.apache.commons.imaging.ImagingException;
import org.apache.commons.imaging.common.Allocator;
import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryType;
import org.apache.commons.imaging.formats.tiff.fieldtypes.AbstractFieldType;
public class TagInfoAscii extends TagInfo {
public TagInfoAscii(final String name, final int tag, final int length, final TiffDirectoryType directoryType) {
super(name, tag, AbstractFieldType.ASCII, length, directoryType);
}
public byte[] encodeValue(final ByteOrder byteOrder, final String... values) throws ImagingException {
return AbstractFieldType.ASCII.writeData(values, byteOrder);
}
public String[] getValue(final ByteOrder byteOrder, final byte[] bytes) {
int nullCount = 0;
for (int i = 0; i < bytes.length - 1; i++) {
if (bytes[i] == 0) {
nullCount++;
}
}
final String[] strings = Allocator.array(nullCount + 1, String[]::new, 24);
int stringsAdded = 0;
strings[0] = ""; // if we have a 0 length string
int nextStringPos = 0;
// According to the Exiftool FAQ, [BROKEN URL] http://www.metadataworkinggroup.org
// specifies that the TIFF ASCII fields are actually UTF-8.
// Exiftool however allows you to configure the charset used.
for (int i = 0; i < bytes.length; i++) {
if (bytes[i] == 0) {
final String string = new String(bytes, nextStringPos, i - nextStringPos, StandardCharsets.UTF_8);
strings[stringsAdded++] = string;
nextStringPos = i + 1;
}
}
if (nextStringPos < bytes.length) {
// Buggy file, string wasn't null terminated
final String string = new String(bytes, nextStringPos, bytes.length - nextStringPos, StandardCharsets.UTF_8);
strings[stringsAdded++] = string;
}
return strings;
}
}