/*
* 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.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fontbox.afm.AFMParser;
import org.apache.fontbox.afm.FontMetric;
import org.apache.fontbox.cff.AFMFormatter;
import org.apache.fontbox.cff.charset.CFFCharset;
import org.apache.fontbox.cff.encoding.CFFEncoding;
import org.apache.fontbox.cff.CFFFont;
import org.apache.fontbox.cff.CFFParser;
import org.apache.fontbox.cff.Type1FontFormatter;
import org.apache.fontbox.util.BoundingBox;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSFloat;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.cos.COSNumber;
import org.apache.pdfbox.encoding.Encoding;
import org.apache.pdfbox.encoding.EncodingManager;
import org.apache.pdfbox.exceptions.WrappedIOException;
import org.apache.pdfbox.pdmodel.common.PDMatrix;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.common.PDStream;
/**
* This class represents a CFF/Type2 Font (aka Type1C Font).
* @author Villu Ruusmann
* @version $Revision: 10.0$
*/
public class PDType1CFont extends PDSimpleFont
{
private CFFFont cffFont = null;
private Map<Integer, String> codeToName = new HashMap<Integer, String>();
private Map<Integer, String> codeToCharacter = new HashMap<Integer, String>();
private Map<String, Integer> characterToCode = new HashMap<String, Integer>();
private FontMetric fontMetric = null;
private Font awtFont = null;
private Map<String, Float> glyphWidths = new HashMap<String, Float>();
private Map<String, Float> glyphHeights = new HashMap<String, Float>();
private Float avgWidth = null;
private PDRectangle fontBBox = null;
private static final Log log = LogFactory.getLog(PDType1CFont.class);
private static final byte[] SPACE_BYTES = {(byte)32};
private COSDictionary fontDict = null;
/**
* Constructor.
* @param fontDictionary the corresponding dictionary
*/
public PDType1CFont( COSDictionary fontDictionary ) throws IOException
{
super( fontDictionary );
fontDict = fontDictionary;
load();
}
/**
* {@inheritDoc}
*/
public String encode( byte[] bytes, int offset, int length ) throws IOException
{
String character = getCharacter(bytes, offset, length);
if( character == null )
{
log.debug("No character for code " + (bytes[offset] & 0xff) + " in " + this.cffFont.getName());
return null;
}
return character;
}
private String getCharacter( byte[] bytes, int offset, int length )
{
if (length > 2)
{
return null;
}
int code = bytes[offset] & 0xff;
if (length == 2)
{
code = code * 256 + bytes[offset+1] & 0xff;
}
return (String)this.codeToCharacter.get(code);
}
/**
* {@inheritDoc}
*/
public float getFontWidth( byte[] bytes, int offset, int length ) throws IOException
{
String name = getName(bytes, offset, length);
if( name == null && !Arrays.equals(SPACE_BYTES, bytes) )
{
log.debug("No name for code " + (bytes[offset] & 0xff) + " in " + this.cffFont.getName());
return 0;
}
Float width = (Float)this.glyphWidths.get(name);
if( width == null )
{
width = Float.valueOf(getFontMetric().getCharacterWidth(name));
this.glyphWidths.put(name, width);
}
return width.floatValue();
}
/**
* {@inheritDoc}
*/
public float getFontHeight( byte[] bytes, int offset, int length ) throws IOException
{
String name = getName(bytes, offset, length);
if( name == null )
{
log.debug("No name for code " + (bytes[offset] & 0xff) + " in " + this.cffFont.getName());
return 0;
}
Float height = (Float)this.glyphHeights.get(name);
if( height == null )
{
height = Float.valueOf(getFontMetric().getCharacterHeight(name));
this.glyphHeights.put(name, height);
}
return height.floatValue();
}
private String getName( byte[] bytes, int offset, int length )
{
if (length > 2)
{
return null;
}
int code = bytes[offset] & 0xff;
if (length == 2)
{
code = code * 256 + bytes[offset+1] & 0xff;
}
return (String)this.codeToName.get(code);
}
/**
* {@inheritDoc}
*/
public float getStringWidth( String string ) throws IOException
{
float width = 0;
for( int i = 0; i < string.length(); i++ )
{
String character = string.substring(i, i + 1);
Integer code = getCode(character);
if( code == null )
{
log.debug("No code for character " + character);
return 0;
}
width += getFontWidth(new byte[]{(byte)code.intValue()}, 0, 1);
}
return width;
}
private Integer getCode( String character )
{
return (Integer)this.characterToCode.get(character);
}
/**
* {@inheritDoc}
*/
public float getAverageFontWidth() throws IOException
{
if( this.avgWidth == null )
{
this.avgWidth = Float.valueOf(getFontMetric().getAverageCharacterWidth());
}
return this.avgWidth.floatValue();
}
/**
* {@inheritDoc}
*/
public PDRectangle getFontBoundingBox() throws IOException
{
if( this.fontBBox == null )
{
this.fontBBox = new PDRectangle(getFontMetric().getFontBBox());
}
return this.fontBBox;
}
/**
* {@inheritDoc}
*/
public PDMatrix getFontMatrix()
{
if( fontMatrix == null )
{
List<Number> numbers = (List<Number>)this.cffFont.getProperty("FontMatrix");
if( numbers != null && numbers.size() == 6 )
{
COSArray array = new COSArray();
for(Number number : numbers)
{
array.add(new COSFloat(number.floatValue()));
}
fontMatrix = new PDMatrix(array);
}
else
{
super.getFontMatrix();
}
}
return fontMatrix;
}
/**
* {@inheritDoc}
*/
public Font getawtFont() throws IOException
{
if (awtFont == null)
{
this.awtFont = prepareAwtFont(this.cffFont);
}
return awtFont;
}
private FontMetric getFontMetric()
{
if (fontMetric == null)
{
try
{
fontMetric = prepareFontMetric(cffFont);
}
catch (IOException exception)
{
log.error("An error occured while extracting the font metrics!", exception);
}
}
return fontMetric;
}
private void load() throws IOException
{
byte[] cffBytes = loadBytes();
CFFParser cffParser = new CFFParser();
List<CFFFont> fonts = cffParser.parse(cffBytes);
this.cffFont = (CFFFont)fonts.get(0);
CFFEncoding encoding = this.cffFont.getEncoding();
PDFEncoding pdfEncoding = new PDFEncoding(encoding);
CFFCharset charset = this.cffFont.getCharset();
PDFCharset pdfCharset = new PDFCharset(charset);
Map<String,byte[]> charStringsDict = this.cffFont.getCharStringsDict();
Map<String,byte[]> pdfCharStringsDict = new LinkedHashMap<String,byte[]>();
pdfCharStringsDict.put(".notdef", charStringsDict.get(".notdef"));
Map<Integer,String> codeToNameMap = new LinkedHashMap<Integer,String>();
Collection<CFFFont.Mapping> mappings = this.cffFont.getMappings();
for( Iterator<CFFFont.Mapping> it = mappings.iterator(); it.hasNext();)
{
CFFFont.Mapping mapping = it.next();
Integer code = Integer.valueOf(mapping.getCode());
String name = mapping.getName();
codeToNameMap.put(code, name);
}
Set<String> knownNames = new HashSet<String>(codeToNameMap.values());
Map<Integer,String> codeToNameOverride = loadOverride();
for( Iterator<Map.Entry<Integer, String>> it = (codeToNameOverride.entrySet()).iterator(); it.hasNext();)
{
Map.Entry<Integer, String> entry = it.next();
Integer code = (Integer)entry.getKey();
String name = (String)entry.getValue();
if(knownNames.contains(name))
{
codeToNameMap.put(code, name);
}
}
Map nameToCharacter;
try
{
// TODO remove access by reflection
Field nameToCharacterField = Encoding.class.getDeclaredField("NAME_TO_CHARACTER");
nameToCharacterField.setAccessible(true);
nameToCharacter = (Map)nameToCharacterField.get(null);
}
catch( Exception e )
{
throw new RuntimeException(e);
}
for( Iterator<Map.Entry<Integer,String>> it = (codeToNameMap.entrySet()).iterator(); it.hasNext();)
{
Map.Entry<Integer,String> entry = it.next();
Integer code = (Integer)entry.getKey();
String name = (String)entry.getValue();
String uniName = "uni";
String character = (String)nameToCharacter.get(name);
if( character != null )
{
for( int j = 0; j < character.length(); j++ )
{
uniName += hexString(character.charAt(j), 4);
}
}
else
{
uniName += hexString(code.intValue(), 4);
character = String.valueOf((char)code.intValue());
}
pdfEncoding.register(code.intValue(), code.intValue());
pdfCharset.register(code.intValue(), uniName);
this.codeToName.put(code, uniName);
this.codeToCharacter.put(code, character);
this.characterToCode.put(character, code);
pdfCharStringsDict.put(uniName, charStringsDict.get(name));
}
this.cffFont.setEncoding(pdfEncoding);
this.cffFont.setCharset(pdfCharset);
charStringsDict.clear();
charStringsDict.putAll(pdfCharStringsDict);
Number defaultWidthX = (Number)this.cffFont.getProperty("defaultWidthX");
this.glyphWidths.put(null, Float.valueOf(defaultWidthX.floatValue()));
}
private byte[] loadBytes() throws IOException
{
PDFontDescriptor fd = getFontDescriptor();
if( fd != null && fd instanceof PDFontDescriptorDictionary)
{
PDStream ff3Stream = ((PDFontDescriptorDictionary)fd).getFontFile3();
if( ff3Stream != null )
{
ByteArrayOutputStream os = new ByteArrayOutputStream();
InputStream is = ff3Stream.createInputStream();
try
{
byte[] buf = new byte[512];
while(true)
{
int count = is.read(buf);
if( count < 0 )
{
break;
}
os.write(buf, 0, count);
}
}
finally
{
is.close();
}
return os.toByteArray();
}
}
throw new IOException();
}
private Map<Integer,String> loadOverride() throws IOException
{
Map<Integer,String> result = new LinkedHashMap<Integer,String>();
COSBase encoding = fontDict.getDictionaryObject(COSName.ENCODING);
if( encoding instanceof COSName )
{
COSName name = (COSName)encoding;
result.putAll(loadEncoding(name));
}
else if( encoding instanceof COSDictionary )
{
COSDictionary encodingDic = (COSDictionary)encoding;
COSName baseName = (COSName)encodingDic.getDictionaryObject(COSName.BASE_ENCODING);
if( baseName != null )
{
result.putAll(loadEncoding(baseName));
}
COSArray differences = (COSArray)encodingDic.getDictionaryObject(COSName.DIFFERENCES);
if( differences != null )
{
result.putAll(loadDifferences(differences));
}
}
return result;
}
private Map<Integer,String> loadEncoding(COSName name) throws IOException
{
Map<Integer,String> result = new LinkedHashMap<Integer,String>();
Encoding encoding = EncodingManager.INSTANCE.getEncoding(name);
for( Iterator<Map.Entry<Integer,String>> it = (encoding.getCodeToNameMap().entrySet()).iterator();
it.hasNext();)
{
Map.Entry<Integer,String> entry = it.next();
result.put(entry.getKey(), (entry.getValue()));
}
return result;
}
private Map<Integer,String> loadDifferences(COSArray differences)
{
Map<Integer,String> result = new LinkedHashMap<Integer,String>();
Integer code = null;
for( int i = 0; i < differences.size(); i++)
{
COSBase element = differences.get(i);
if( element instanceof COSNumber )
{
COSNumber number = (COSNumber)element;
code = Integer.valueOf(number.intValue());
}
else
{
if( element instanceof COSName )
{
COSName name = (COSName)element;
result.put(code, name.getName());
code = Integer.valueOf(code.intValue() + 1);
}
}
}
return result;
}
private static String hexString( int code, int length )
{
String string = Integer.toHexString(code);
while(string.length() < length)
{
string = ("0" + string);
}
return string;
}
private FontMetric prepareFontMetric( CFFFont font ) throws IOException
{
byte[] afmBytes = AFMFormatter.format(font);
InputStream is = new ByteArrayInputStream(afmBytes);
try
{
AFMParser afmParser = new AFMParser(is);
afmParser.parse();
FontMetric result = afmParser.getResult();
// Replace default FontBBox value with a newly computed one
BoundingBox bounds = result.getFontBBox();
List<Integer> numbers = Arrays.asList(
Integer.valueOf((int)bounds.getLowerLeftX()),
Integer.valueOf((int)bounds.getLowerLeftY()),
Integer.valueOf((int)bounds.getUpperRightX()),
Integer.valueOf((int)bounds.getUpperRightY())
);
font.addValueToTopDict("FontBBox", numbers);
return result;
}
finally
{
is.close();
}
}
private static Font prepareAwtFont( CFFFont font ) throws IOException
{
byte[] type1Bytes = Type1FontFormatter.format(font);
InputStream is = new ByteArrayInputStream(type1Bytes);
try
{
return Font.createFont(Font.TYPE1_FONT, is);
}
catch( FontFormatException ffe )
{
throw new WrappedIOException(ffe);
}
finally
{
is.close();
}
}
/**
* This class represents a PDFEncoding.
*
*/
private static class PDFEncoding extends CFFEncoding
{
private PDFEncoding( CFFEncoding parent )
{
Iterator<Entry> parentEntries = parent.getEntries().iterator();
while(parentEntries.hasNext())
{
addEntry(parentEntries.next());
}
}
public boolean isFontSpecific()
{
return true;
}
}
/**
* This class represents a PDFCharset.
*
*/
private static class PDFCharset extends CFFCharset
{
private PDFCharset( CFFCharset parent )
{
Iterator<Entry> parentEntries = parent.getEntries().iterator();
while(parentEntries.hasNext())
{
addEntry(parentEntries.next());
}
}
public boolean isFontSpecific()
{
return true;
}
}
}