org.apache.pdfbox.pdmodel.font.PDCIDFontType2Font Maven / Gradle / Ivy
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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.pdmodel.font;
import java.awt.Font;
import java.awt.FontFormatException;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSStream;
import org.apache.pdfbox.io.IOUtils;
import org.apache.pdfbox.pdmodel.common.PDStream;
/**
* This is implementation of the CIDFontType2 Font.
*
* @author Ben Litchfield
*
*/
public class PDCIDFontType2Font extends PDCIDFont
{
/**
* Log instance.
*/
private static final Log LOG = LogFactory.getLog(PDCIDFontType2Font.class);
private Boolean hasCIDToGIDMap = null;
private int[] cid2gid = null;
/**
* Constructor.
*/
public PDCIDFontType2Font()
{
super();
font.setItem( COSName.SUBTYPE, COSName.CID_FONT_TYPE2 );
}
/**
* Constructor.
*
* @param fontDictionary The font dictionary according to the PDF specification.
*/
public PDCIDFontType2Font( COSDictionary fontDictionary )
{
super( fontDictionary );
}
/**
* {@inheritDoc}
*/
public Font getawtFont() throws IOException
{
Font awtFont = null;
PDFontDescriptorDictionary fd = (PDFontDescriptorDictionary)getFontDescriptor();
PDStream ff2Stream = fd.getFontFile2();
if( ff2Stream != null )
{
try
{
// create a font with the embedded data
awtFont = Font.createFont( Font.TRUETYPE_FONT, ff2Stream.createInputStream() );
}
catch( FontFormatException f )
{
LOG.info("Can't read the embedded font " + fd.getFontName() );
}
if (awtFont == null)
{
if (fd.getFontName() != null)
{
awtFont = FontManager.getAwtFont(fd.getFontName());
}
if (awtFont != null)
{
LOG.info("Using font "+awtFont.getName()+ " instead");
}
setIsFontSubstituted(true);
}
}
return awtFont;
}
/**
* read the CIDToGID map.
*/
private void readCIDToGIDMapping()
{
COSBase map = font.getDictionaryObject(COSName.CID_TO_GID_MAP);
if (map instanceof COSStream)
{
COSStream stream = (COSStream)map;
try
{
InputStream is = stream.getUnfilteredStream();
byte[] mapAsBytes = IOUtils.toByteArray(is);
IOUtils.closeQuietly(is);
int numberOfInts = mapAsBytes.length / 2;
cid2gid = new int[numberOfInts];
int offset = 0;
for(int index = 0;index < numberOfInts;index++)
{
cid2gid[index] = getCodeFromArray(mapAsBytes, offset, 2);
offset+=2;
}
}
catch(IOException exception)
{
LOG.error("Can't read the CIDToGIDMap", exception);
}
}
}
/**
* Indicates if this font has a CIDToGIDMap.
*
* @return returns true if the font has a CIDToGIDMap.
*/
public boolean hasCIDToGIDMap()
{
if (hasCIDToGIDMap == null)
{
COSBase map = font.getDictionaryObject(COSName.CID_TO_GID_MAP);
if (map != null && map instanceof COSStream)
{
hasCIDToGIDMap = Boolean.TRUE;
}
else
{
hasCIDToGIDMap = Boolean.FALSE;
}
}
return hasCIDToGIDMap.booleanValue();
}
/**
* Maps the given CID to the correspondent GID.
*
* @param cid the given CID
* @return the mapped GID, or -1 if something went wrong.
*/
public int mapCIDToGID(int cid)
{
if (hasCIDToGIDMap())
{
if (cid2gid == null)
{
readCIDToGIDMapping();
}
if (cid2gid != null && cid < cid2gid.length)
{
return cid2gid[cid];
}
return -1;
}
else
{
// identity is the default value
return cid;
}
}
}