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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.pdfbox.encoding;
import java.io.IOException;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSNumber;
/**
* This will perform the encoding from a dictionary.
*
* @author Ben Litchfield
* @version $Revision: 1.13 $
*/
public class DictionaryEncoding extends Encoding
{
private COSDictionary encoding = null;
/**
* Constructor.
*
* @param fontEncoding The encoding dictionary.
*
* @throws IOException If there is a problem getting the base font.
*/
public DictionaryEncoding( COSDictionary fontEncoding ) throws IOException
{
encoding = fontEncoding;
//first set up the base encoding
//The previious value WinAnsiEncoding() has been changed to StandardEnding
//see p 389 of the PDF 1.5 ref�rence table 5.11 entries in a dictionary encoding
//"If this entry is absent, the Differences entry describes differences from an implicit
//base encoding. For a font program that is embedded in the PDF file, the
//implicit base encoding is the font program�s built-in encoding, as described
//above and further elaborated in the sections on specific font types below. Otherwise,
//for a nonsymbolic font, it is StandardEncoding, and for a symbolic font, it
//is the font�s built-in encoding."
// The default base encoding is standardEncoding
Encoding baseEncoding = StandardEncoding.INSTANCE;
COSName baseEncodingName =
(COSName) encoding.getDictionaryObject(COSName.BASE_ENCODING);
if (baseEncodingName != null) {
baseEncoding =
EncodingManager.INSTANCE.getEncoding(baseEncodingName);
}
nameToCode.putAll( baseEncoding.nameToCode );
codeToName.putAll( baseEncoding.codeToName );
//now replace with the differences.
COSArray differences = (COSArray)encoding.getDictionaryObject( COSName.DIFFERENCES );
int currentIndex = -1;
for( int i=0; differences != null && i