cjkfont.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * $Id: CJKFont.java 2382 2006-09-15 23:37:38Z xlv $
 * $Name$
 *
 * Copyright 2000, 2001, 2002 by Paulo Soares.
 *
 * 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, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 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.lowagie.text.pdf;

import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Properties;
import java.util.StringTokenizer;

import com.lowagie.text.DocumentException;

/**
 * Creates a CJK font compatible with the fonts in the Adobe Asian font Pack.
 *
 * @author  Paulo Soares ([e-mail])
 */

class CJKFont extends BaseFont {
    /** The encoding used in the PDF document for CJK fonts
     */
    static final String CJK_ENCODING = "UnicodeBigUnmarked";
    private static final int FIRST = 0;
    private static final int BRACKET = 1;
    private static final int SERIAL = 2;
    private static final int V1Y = 880;
        
    static Properties cjkFonts = new Properties();
    static Properties cjkEncodings = new Properties();
    static Hashtable allCMaps = new Hashtable();
    static Hashtable allFonts = new Hashtable();
    private static boolean propertiesLoaded = false;
    
    /** The font name */
    private String fontName;
    /** The style modifier */
    private String style = "";
    /** The CMap name associated with this font */
    private String CMap;
    
    private boolean cidDirect = false;
    
    private char[] translationMap;
    private IntHashtable vMetrics;
    private IntHashtable hMetrics;
    private HashMap fontDesc;
    private boolean vertical = false;
    
    private static void loadProperties() {
        if (propertiesLoaded)
            return;
        synchronized (allFonts) {
            if (propertiesLoaded)
                return;
            try {
                InputStream is = getResourceStream(RESOURCE_PATH + "cjkfonts.properties");
                cjkFonts.load(is);
                is.close();
                is = getResourceStream(RESOURCE_PATH + "cjkencodings.properties");
                cjkEncodings.load(is);
                is.close();
            }
            catch (Exception e) {
                cjkFonts = new Properties();
                cjkEncodings = new Properties();
            }
            propertiesLoaded = true;
        }
    }
    
    /** Creates a CJK font.
     * @param fontName the name of the font
     * @param enc the encoding of the font
     * @param emb always <CODE>false</CODE>. CJK font and not embedded
     * @throws DocumentException on error
     */
    CJKFont(String fontName, String enc, boolean emb) throws DocumentException {
        loadProperties();
        fontType = FONT_TYPE_CJK;
        String nameBase = getBaseName(fontName);
        if (!isCJKFont(nameBase, enc))
            throw new DocumentException("Font '" + fontName + "' with '" + enc + "' encoding is not a CJK font.");
        if (nameBase.length() < fontName.length()) {
            style = fontName.substring(nameBase.length());
            fontName = nameBase;
        }
        this.fontName = fontName;
        encoding = CJK_ENCODING;
        vertical = enc.endsWith("V");
        CMap = enc;
        if (enc.startsWith("Identity-")) {
            cidDirect = true;
            String s = cjkFonts.getProperty(fontName);
            s = s.substring(0, s.indexOf('_'));
            char c[] = (char[])allCMaps.get(s);
            if (c == null) {
                c = readCMap(s);
                if (c == null)
                    throw new DocumentException("The cmap " + s + " does not exist as a resource.");
                c[CID_NEWLINE] = '\n';
                allCMaps.put(s, c);
            }
            translationMap = c;
        }
        else {
            char c[] = (char[])allCMaps.get(enc);
            if (c == null) {
                String s = cjkEncodings.getProperty(enc);
                if (s == null)
                    throw new DocumentException("The resource cjkencodings.properties does not contain the encoding " + enc);
                StringTokenizer tk = new StringTokenizer(s);
                String nt = tk.nextToken();
                c = (char[])allCMaps.get(nt);
                if (c == null) {
                    c = readCMap(nt);
                    allCMaps.put(nt, c);
                }
                if (tk.hasMoreTokens()) {
                    String nt2 = tk.nextToken();
                    char m2[] = readCMap(nt2);
                    for (int k = 0; k < 0x10000; ++k) {
                        if (m2[k] == 0)
                            m2[k] = c[k];
                    }
                    allCMaps.put(enc, m2);
                    c = m2;
                }
            }
            translationMap = c;
        }
        fontDesc = (HashMap)allFonts.get(fontName);
        if (fontDesc == null) {
            fontDesc = readFontProperties(fontName);
            allFonts.put(fontName, fontDesc);
        }
        hMetrics = (IntHashtable)fontDesc.get("W");
        vMetrics = (IntHashtable)fontDesc.get("W2");
    }
    
    /** Checks if its a valid CJK font.
     * @param fontName the font name
     * @param enc the encoding
     * @return <CODE>true</CODE> if it is CJK font
     */
    public static boolean isCJKFont(String fontName, String enc) {
        loadProperties();
        String encodings = cjkFonts.getProperty(fontName);
        return (encodings != null && (enc.equals("Identity-H") || enc.equals("Identity-V") || encodings.indexOf("_" + enc + "_") >= 0));
    }
        
    public int getWidth(String text) {
        int total = 0;
        for (int k = 0; k < text.length(); ++k) {
            int c = text.charAt(k);
            if (!cidDirect)
                c = translationMap[c];
            int v;
            if (vertical)
                v = vMetrics.get(c);
            else
                v = hMetrics.get(c);
            if (v > 0)
                total += v;
            else
                total += 1000;
        }
        return total;
    }
    
    int getRawWidth(int c, String name) {
        return 0;
    }
  
    public int getKerning(char char1, char char2) {
        return 0;
    }

    private PdfDictionary getFontDescriptor() {
        PdfDictionary dic = new PdfDictionary(PdfName.FONTDESCRIPTOR);
        dic.put(PdfName.ASCENT, new PdfLiteral((String)fontDesc.get("Ascent")));
        dic.put(PdfName.CAPHEIGHT, new PdfLiteral((String)fontDesc.get("CapHeight")));
        dic.put(PdfName.DESCENT, new PdfLiteral((String)fontDesc.get("Descent")));
        dic.put(PdfName.FLAGS, new PdfLiteral((String)fontDesc.get("Flags")));
        dic.put(PdfName.FONTBBOX, new PdfLiteral((String)fontDesc.get("FontBBox")));
        dic.put(PdfName.FONTNAME, new PdfName(fontName + style));
        dic.put(PdfName.ITALICANGLE, new PdfLiteral((String)fontDesc.get("ItalicAngle")));
        dic.put(PdfName.STEMV, new PdfLiteral((String)fontDesc.get("StemV")));
        PdfDictionary pdic = new PdfDictionary();
        pdic.put(PdfName.PANOSE, new PdfString((String)fontDesc.get("Panose"), null));
        dic.put(PdfName.STYLE, pdic);
        return dic;
    }
    
    private PdfDictionary getCIDFont(PdfIndirectReference fontDescriptor, IntHashtable cjkTag) {
        PdfDictionary dic = new PdfDictionary(PdfName.FONT);
        dic.put(PdfName.SUBTYPE, PdfName.CIDFONTTYPE0);
        dic.put(PdfName.BASEFONT, new PdfName(fontName + style));
        dic.put(PdfName.FONTDESCRIPTOR, fontDescriptor);
        int keys[] = cjkTag.toOrderedKeys();
        String w = convertToHCIDMetrics(keys, hMetrics);
        if (w != null)
            dic.put(PdfName.W, new PdfLiteral(w));
        if (vertical) {
            w = convertToVCIDMetrics(keys, vMetrics, hMetrics);
            if (w != null)
                dic.put(PdfName.W2, new PdfLiteral(w));
        }
        else
            dic.put(PdfName.DW, new PdfNumber(1000));
        PdfDictionary cdic = new PdfDictionary();
        cdic.put(PdfName.REGISTRY, new PdfString((String)fontDesc.get("Registry"), null));
        cdic.put(PdfName.ORDERING, new PdfString((String)fontDesc.get("Ordering"), null));
        cdic.put(PdfName.SUPPLEMENT, new PdfLiteral((String)fontDesc.get("Supplement")));
        dic.put(PdfName.CIDSYSTEMINFO, cdic);
        return dic;
    }
    
    private PdfDictionary getFontBaseType(PdfIndirectReference CIDFont) {
        PdfDictionary dic = new PdfDictionary(PdfName.FONT);
        dic.put(PdfName.SUBTYPE, PdfName.TYPE0);
        String name = fontName;
        if (style.length() > 0)
            name += "-" + style.substring(1);
        name += "-" + CMap;
        dic.put(PdfName.BASEFONT, new PdfName(name));
        dic.put(PdfName.ENCODING, new PdfName(CMap));
        dic.put(PdfName.DESCENDANTFONTS, new PdfArray(CIDFont));
        return dic;
    }
    
    void writeFont(PdfWriter writer, PdfIndirectReference ref, Object params[]) throws DocumentException, IOException {
        IntHashtable cjkTag = (IntHashtable)params[0];
        PdfIndirectReference ind_font = null;
        PdfObject pobj = null;
        PdfIndirectObject obj = null;
        pobj = getFontDescriptor();
        if (pobj != null){
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        pobj = getCIDFont(ind_font, cjkTag);
        if (pobj != null){
            obj = writer.addToBody(pobj);
            ind_font = obj.getIndirectReference();
        }
        pobj = getFontBaseType(ind_font);
        writer.addToBody(pobj, ref);
    }
    
    private float getDescNumber(String name) {
        return Integer.parseInt((String)fontDesc.get(name));
    }
    
    private float getBBox(int idx) {
        String s = (String)fontDesc.get("FontBBox");
        StringTokenizer tk = new StringTokenizer(s, " []\r\n\t\f");
        String ret = tk.nextToken();
        for (int k = 0; k < idx; ++k)
            ret = tk.nextToken();
        return Integer.parseInt(ret);
    }
    
    /** Gets the font parameter identified by <CODE>key</CODE>. Valid values
     * for <CODE>key</CODE> are <CODE>ASCENT</CODE>, <CODE>CAPHEIGHT</CODE>, <CODE>DESCENT</CODE>