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* Copyright (c) 2003, www.pdfbox.org
* All rights reserved.
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* modification, are permitted provided that the following conditions are met:
*
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* this list of conditions and the following disclaimer.
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* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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package org.pdfbox.encoding;
import java.io.IOException;
import org.pdfbox.cos.COSArray;
import org.pdfbox.cos.COSBase;
import org.pdfbox.cos.COSDictionary;
import org.pdfbox.cos.COSName;
import org.pdfbox.cos.COSNumber;
/**
* This will perform the encoding from a dictionary.
*
* @author <a href="mailto:ben@benlitchfield.com">Ben Litchfield</a>
* @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."
//so the default base encoding is standardEncoding
Encoding baseEncoding = new StandardEncoding();
COSName baseEncodingName = (COSName)encoding.getDictionaryObject( COSName.BASE_ENCODING );
if( baseEncodingName != null )
{
EncodingManager manager = new EncodingManager();
baseEncoding = manager.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<differences.size(); i++ )
{
COSBase next = differences.getObject( i );
if( next instanceof COSNumber )
{
currentIndex = ((COSNumber)next).intValue();
}
else if( next instanceof COSName )
{
COSName name = (COSName)next;
addCharacterEncoding( currentIndex++, name );
}
}
}
/**
* Convert this standard java object to a COS object.
*
* @return The cos object that matches this Java object.
*/
public COSBase getCOSObject()
{
return encoding;
}
}