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/*
* Copyright 2008 by Kevin Day.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999-2008 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000-2008 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.aowagie.text.pdf;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import com.aowagie.text.pdf.fonts.cmaps.CMap;
import com.aowagie.text.pdf.fonts.cmaps.CMapParser;
/**
* Implementation of DocumentFont used while parsing PDF streams.
* @since 2.1.4
*/
public class CMapAwareDocumentFont extends DocumentFont {
/** The font dictionary. */
private final PdfDictionary fontDic;
/** the width of a space for this font, in normalized 1000 point units */
private int spaceWidth;
/** The CMap constructed from the ToUnicode map from the font's dictionary, if present.
* This CMap transforms CID values into unicode equivalent
*/
private CMap toUnicodeCmap;
/**
* Mapping between CID code (single byte only for now) and unicode equivalent
* as derived by the font's encoding. Only needed if the ToUnicode CMap is not provided.
*/
private char[] cidbyte2uni;
/**
* Creates an instance of a CMapAwareFont based on an indirect reference to a font.
* @param refFont the indirect reference to a font
*/
public CMapAwareDocumentFont(final PRIndirectReference refFont) {
super(refFont);
this.fontDic = (PdfDictionary)PdfReader.getPdfObjectRelease(refFont);
processToUnicode();
if (this.toUnicodeCmap == null) {
processUni2Byte();
}
this.spaceWidth = super.getWidth(' ');
if (this.spaceWidth == 0){
this.spaceWidth = computeAverageWidth();
}
}
/**
* Parses the ToUnicode entry, if present, and constructs a CMap for it
* @since 2.1.7
*/
private void processToUnicode(){
final PdfObject toUni = this.fontDic.get(PdfName.TOUNICODE);
if (toUni != null){
try {
final byte[] touni = PdfReader.getStreamBytes((PRStream)PdfReader.getPdfObjectRelease(toUni));
final CMapParser cmapParser = new CMapParser();
this.toUnicodeCmap = cmapParser.parse(new ByteArrayInputStream(touni));
} catch (final IOException e) {
throw new Error("Unable to process ToUnicode map - " + e.getMessage(), e);
}
}
}
/**
* Inverts DocumentFont's uni2byte mapping to obtain a cid-to-unicode mapping based
* on the font's encoding
* @since 2.1.7
*/
private void processUni2Byte(){
final IntHashtable uni2byte = getUni2Byte();
final int e[] = uni2byte.toOrderedKeys();
this.cidbyte2uni = new char[256];
for (final int element : e) {
final int n = uni2byte.get(element);
// this is messy, messy - an encoding can have multiple unicode values mapping to the same cid - we are going to arbitrarily choose the first one
// what we really need to do is to parse the encoding, and handle the differences info ourselves. This is a huge duplication of code of what is already
// being done in DocumentFont, so I really hate to go down that path without seriously thinking about a change in the organization of the Font class hierarchy
if (this.cidbyte2uni[n] == 0) {
this.cidbyte2uni[n] = (char)element;
}
}
}
/**
* For all widths of all glyphs, compute the average width in normalized 1000 point units.
* This is used to give some meaningful width in cases where we need an average font width
* (such as if the width of a space isn't specified by a given font)
* @return the average width of all non-zero width glyphs in the font
*/
private int computeAverageWidth(){
int count = 0;
int total = 0;
for(int i = 0; i < super.widths.length; i++){
if(super.widths[i] != 0){
total += super.widths[i];
count++;
}
}
return count != 0 ? total/count : 0;
}
/**
* @since 2.1.5
* Override to allow special handling for fonts that don't specify width of space character
* @see com.aowagie.text.pdf.DocumentFont#getWidth(int)
*/
@Override
public int getWidth(final int char1) {
if (char1 == ' ') {
return this.spaceWidth;
}
return super.getWidth(char1);
}
/**
* Decodes a single CID (represented by one or two bytes) to a unicode String.
* @param bytes the bytes making up the character code to convert
* @param offset an offset
* @param len a length
* @return a String containing the encoded form of the input bytes using the font's encoding.
*/
private String decodeSingleCID(final byte[] bytes, final int offset, final int len){
if (this.toUnicodeCmap != null){
if (offset + len > bytes.length) {
throw new ArrayIndexOutOfBoundsException("Invalid index: " + offset + len);
}
return this.toUnicodeCmap.lookup(bytes, offset, len);
}
if (len == 1){
return new String(this.cidbyte2uni, 0xff & bytes[offset], 1);
}
throw new Error("Multi-byte glyphs not implemented yet");
}
/**
* Decodes a string of bytes (encoded in the font's encoding) into a unicode string
* This will use the ToUnicode map of the font, if available, otherwise it uses
* the font's encoding
* @param cidbytes the bytes that need to be decoded
* @param offset index of offset
* @param len index fot the lenght
* @return the unicode String that results from decoding
* @since 2.1.7
*/
public String decode(final byte[] cidbytes, final int offset, final int len){
final StringBuffer sb = new StringBuffer(); // it's a shame we can't make this StringBuilder
for(int i = offset; i < offset + len; i++){
String rslt = decodeSingleCID(cidbytes, i, 1);
if (rslt == null){
rslt = decodeSingleCID(cidbytes, i, 2);
i++;
}
sb.append(rslt);
}
return sb.toString();
}
}
