truetypefont.java

一个java操作pdf文件的开发包,很好用的.

/*
 * $Id: TrueTypeFont.java,v 1.30 2002/11/19 08:33:39 blowagie Exp $
 * $Name:  $
 *
 * Copyright 2001, 2002 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.*;
import java.util.HashMap;
import java.util.ArrayList;
import com.lowagie.text.DocumentException;
import com.lowagie.text.ExceptionConverter;
/** Reads a Truetype font
 *
 * @author Paulo Soares ([e-mail])
 */
class TrueTypeFont extends BaseFont {

    /** The code pages possible for a True Type font.
     */    
    static final String codePages[] = {
        "1252 Latin 1",
        "1250 Latin 2: Eastern Europe",
        "1251 Cyrillic",
        "1253 Greek",
        "1254 Turkish",
        "1255 Hebrew",
        "1256 Arabic",
        "1257 Windows Baltic",
        "1258 Vietnamese",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "874 Thai",
        "932 JIS/Japan",
        "936 Chinese: Simplified chars--PRC and Singapore",
        "949 Korean Wansung",
        "950 Chinese: Traditional chars--Taiwan and Hong Kong",
        "1361 Korean Johab",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "Macintosh Character Set (US Roman)",
        "OEM Character Set",
        "Symbol Character Set",
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        "869 IBM Greek",
        "866 MS-DOS Russian",
        "865 MS-DOS Nordic",
        "864 Arabic",
        "863 MS-DOS Canadian French",
        "862 Hebrew",
        "861 MS-DOS Icelandic",
        "860 MS-DOS Portuguese",
        "857 IBM Turkish",
        "855 IBM Cyrillic; primarily Russian",
        "852 Latin 2",
        "775 MS-DOS Baltic",
        "737 Greek; former 437 G",
        "708 Arabic; ASMO 708",
        "850 WE/Latin 1",
        "437 US"};
 
    protected boolean justNames = false;
    /** Contains the location of the several tables. The key is the name of
     * the table and the value is an <CODE>int[2]</CODE> where position 0
     * is the offset from the start of the file and position 1 is the length
     * of the table.
     */
    protected HashMap tables;
    /** The file in use.
     */
    protected RandomAccessFileOrArray rf;
    /** The file name.
     */
    protected String fileName;
    
    protected boolean cff = false;
    
    protected int cffOffset;
    
    protected int cffLength;
    
    /** The offset from the start of the file to the table directory.
     * It is 0 for TTF and may vary for TTC depending on the chosen font.
     */    
    protected int directoryOffset;
    /** The index for the TTC font. It is an empty <CODE>String</CODE> for a
     * TTF file.
     */    
    protected String ttcIndex;
    /** The style modifier */
    protected String style = "";
    /** The content of table 'head'.
     */
    protected FontHeader head = new FontHeader();
    /** The content of table 'hhea'.
     */
    protected HorizontalHeader hhea = new HorizontalHeader();
    /** The content of table 'OS/2'.
     */
    protected WindowsMetrics os_2 = new WindowsMetrics();
    /** The width of the glyphs. This is essentially the content of table
     * 'hmtx' normalized to 1000 units.
     */
    protected int GlyphWidths[];
    /** The map containing the code information for the table 'cmap', encoding 1.0.
     * The key is the code and the value is an <CODE>int[2]</CODE> where position 0
     * is the glyph number and position 1 is the glyph width normalized to 1000
     * units.
     */
    protected HashMap cmap10;
    /** The map containing the code information for the table 'cmap', encoding 3.1
     * in Unicode.
     * <P>
     * The key is the code and the value is an <CODE>int</CODE>[2] where position 0
     * is the glyph number and position 1 is the glyph width normalized to 1000
     * units.
     */
    protected HashMap cmap31;
    /** The map containig the kerning information. It represents the content of
     * table 'kern'. The key is an <CODE>Integer</CODE> where the top 16 bits
     * are the Unicode for the first character and the lower 16 bits are the
     * Unicode for the second character. The value is the amount of kerning in
     * normalized 1000 units as an <CODE>Integer</CODE>. This value is usually negative.
     */
    protected HashMap kerning;
    /**
     * The font name.
     * This name is usually extracted from the table 'name' with
     * the 'Name ID' 6.
     */
    protected String fontName;
    
    /** The full name of the font
     */    
    protected String fullName[][];

    /** The family name of the font
     */    
    protected String familyName[][];
    /** The italic angle. It is usually extracted from the 'post' table or in it's
     * absence with the code:
     * <P>
     * <PRE>
     * -Math.atan2(hhea.caretSlopeRun, hhea.caretSlopeRise) * 180 / Math.PI
     * </PRE>
     */
    protected double italicAngle;
    /** <CODE>true</CODE> if all the glyphs have the same width.
     */
    protected boolean isFixedPitch = false;
    
    /** The components of table 'head'.
     */
    protected class FontHeader {
        /** A variable. */
        int flags;
        /** A variable. */
        int unitsPerEm;
        /** A variable. */
        short xMin;
        /** A variable. */
        short yMin;
        /** A variable. */
        short xMax;
        /** A variable. */
        short yMax;
        /** A variable. */
        int macStyle;
    }
    
    /** The components of table 'hhea'.
     */
    protected class HorizontalHeader {
        /** A variable. */
        short Ascender;
        /** A variable. */
        short Descender;
        /** A variable. */
        short LineGap;
        /** A variable. */
        int advanceWidthMax;
        /** A variable. */
        short minLeftSideBearing;
        /** A variable. */
        short minRightSideBearing;
        /** A variable. */
        short xMaxExtent;
        /** A variable. */
        short caretSlopeRise;
        /** A variable. */
        short caretSlopeRun;
        /** A variable. */
        int numberOfHMetrics;
    }
    
    /** The components of table 'OS/2'.
     */
    protected class WindowsMetrics {
        /** A variable. */
        short xAvgCharWidth;
        /** A variable. */
        int usWeightClass;
        /** A variable. */
        int usWidthClass;
        /** A variable. */
        short fsType;
        /** A variable. */
        short ySubscriptXSize;
        /** A variable. */
        short ySubscriptYSize;
        /** A variable. */
        short ySubscriptXOffset;
        /** A variable. */
        short ySubscriptYOffset;
        /** A variable. */
        short ySuperscriptXSize;
        /** A variable. */
        short ySuperscriptYSize;
        /** A variable. */
        short ySuperscriptXOffset;
        /** A variable. */
        short ySuperscriptYOffset;
        /** A variable. */
        short yStrikeoutSize;
        /** A variable. */
        short yStrikeoutPosition;
        /** A variable. */
        short sFamilyClass;
        /** A variable. */
        byte panose[] = new byte[10];
        /** A variable. */
        byte achVendID[] = new byte[4];
        /** A variable. */
        int fsSelection;
        /** A variable. */
        int usFirstCharIndex;
        /** A variable. */
        int usLastCharIndex;
        /** A variable. */
        short sTypoAscender;
        /** A variable. */
        short sTypoDescender;
        /** A variable. */
        short sTypoLineGap;
        /** A variable. */
        int usWinAscent;
        /** A variable. */
        int usWinDescent;
        /** A variable. */
        int ulCodePageRange1;
        /** A variable. */
        int ulCodePageRange2;
        /** A variable. */
        int sCapHeight;
    }
    
    /** This constructor is present to allow extending the class.
     */
    protected TrueTypeFont() {
    }
    
    TrueTypeFont(String ttFile, String enc, boolean emb, byte ttfAfm[]) throws DocumentException, IOException {
        this(ttFile, enc, emb, ttfAfm, false);
    }
    
    /** Creates a new TrueType font.
     * @param ttFile the location of the font on file. The file must end in '.ttf' or
     * '.ttc' but can have modifiers after the name
     * @param enc the encoding to be applied to this font
     * @param emb true if the font is to be embedded in the PDF
     * @param ttfAfm the font as a <CODE>byte</CODE> array
     * @throws DocumentException the font is invalid
     * @throws IOException the font file could not be read
     */
    TrueTypeFont(String ttFile, String enc, boolean emb, byte ttfAfm[], boolean justNames) throws DocumentException, IOException {
        this.justNames = justNames;
        String nameBase = getBaseName(ttFile);
        String ttcName = getTTCName(nameBase);
        if (nameBase.length() < ttFile.length()) {
            style = ttFile.substring(nameBase.length());
        }
        encoding = enc;
        embedded = emb;
        fileName = ttcName;
        fontType = FONT_TYPE_TT;
        ttcIndex = "";
        if (ttcName.length() < nameBase.length())
            ttcIndex = nameBase.substring(ttcName.length() + 1);
        if (fileName.toLowerCase().endsWith(".ttf") || fileName.toLowerCase().endsWith(".otf") || fileName.toLowerCase().endsWith(".ttc")) {
            process(ttfAfm);
        }
        else
            throw new DocumentException(fileName + style + " is not a TTF, OTF or TTC font file.");
        try {
            " ".getBytes(enc); // check if the encoding exists
            createEncoding();
        }
        catch (UnsupportedEncodingException e) {
            throw new DocumentException(e.getMessage());
        }
    }
    
    /** Gets the name from a composed TTC file name.
     * If I have for input "myfont.ttc,2" the return will
     * be "myfont.ttc".
     * @param name the full name
     * @return the simple file name
     */    
    protected static String getTTCName(String name) {
        int idx = name.toLowerCase().indexOf(".ttc,");
        if (idx < 0)
            return name;
        else
            return name.substring(0, idx + 4);
    }
    
    
    /**
     * Reads the tables 'head', 'hhea', 'OS/2' and 'post' filling several variables.
     * @throws DocumentException the font is invalid
     * @throws IOException the font file could not be read
     */
    void fillTables() throws DocumentException, IOException {
        int table_location[];