basefont.java

处理PDF

/*
 * $Id: BaseFont.java 3537 2008-07-08 08:53:00Z blowagie $
 *
 * Copyright 2000-2006 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.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.StringTokenizer;

import com.lowagie.text.DocumentException;

/**
 * Base class for the several font types supported
 *
 * @author Paulo Soares ([e-mail])
 */

public abstract class BaseFont {
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String COURIER = "Courier";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String COURIER_BOLD = "Courier-Bold";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String COURIER_OBLIQUE = "Courier-Oblique";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String COURIER_BOLDOBLIQUE = "Courier-BoldOblique";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String HELVETICA = "Helvetica";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String HELVETICA_BOLD = "Helvetica-Bold";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String HELVETICA_OBLIQUE = "Helvetica-Oblique";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String HELVETICA_BOLDOBLIQUE = "Helvetica-BoldOblique";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String SYMBOL = "Symbol";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String TIMES_ROMAN = "Times-Roman";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String TIMES_BOLD = "Times-Bold";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String TIMES_ITALIC = "Times-Italic";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String TIMES_BOLDITALIC = "Times-BoldItalic";
    
    /** This is a possible value of a base 14 type 1 font */
    public static final String ZAPFDINGBATS = "ZapfDingbats";
    
    /** The maximum height above the baseline reached by glyphs in this
     * font, excluding the height of glyphs for accented characters.
     */    
    public static final int ASCENT = 1;    
    /** The y coordinate of the top of flat capital letters, measured from
     * the baseline.
     */    
    public static final int CAPHEIGHT = 2;
    /** The maximum depth below the baseline reached by glyphs in this
     * font. The value is a negative number.
     */    
    public static final int DESCENT = 3;
    /** The angle, expressed in degrees counterclockwise from the vertical,
     * of the dominant vertical strokes of the font. The value is
     * negative for fonts that slope to the right, as almost all italic fonts do.
     */    
    public static final int ITALICANGLE = 4;
    /** The lower left x glyph coordinate.
     */    
    public static final int BBOXLLX = 5;
    /** The lower left y glyph coordinate.
     */    
    public static final int BBOXLLY = 6;
    /** The upper right x glyph coordinate.
     */    
    public static final int BBOXURX = 7;
    /** The upper right y glyph coordinate.
     */    
    public static final int BBOXURY = 8;
    
    /** java.awt.Font property */
    public static final int AWT_ASCENT = 9;
    /** java.awt.Font property */
    public static final int AWT_DESCENT = 10;
    /** java.awt.Font property */
    public static final int AWT_LEADING = 11;
    /** java.awt.Font property */
    public static final int AWT_MAXADVANCE = 12;    
    /**
     * The undeline position. Usually a negative value.
     */
    public static final int UNDERLINE_POSITION = 13;
    /**
     * The underline thickness.
     */
    public static final int UNDERLINE_THICKNESS = 14;
    /**
     * The strikethrough position.
     */
    public static final int STRIKETHROUGH_POSITION = 15;
    /**
     * The strikethrough thickness.
     */
    public static final int STRIKETHROUGH_THICKNESS = 16;
    /**
     * The recommended vertical size for subscripts for this font.
     */
    public static final int SUBSCRIPT_SIZE = 17;
    /**
     * The recommended vertical offset from the baseline for subscripts for this font. Usually a negative value.
     */
    public static final int SUBSCRIPT_OFFSET = 18;
    /**
     * The recommended vertical size for superscripts for this font.
     */
    public static final int SUPERSCRIPT_SIZE = 19;
    /**
     * The recommended vertical offset from the baseline for superscripts for this font.
     */
    public static final int SUPERSCRIPT_OFFSET = 20;
    /** The font is Type 1.
     */    
    public static final int FONT_TYPE_T1 = 0;
    /** The font is True Type with a standard encoding.
     */    
    public static final int FONT_TYPE_TT = 1;
    /** The font is CJK.
     */    
    public static final int FONT_TYPE_CJK = 2;
    /** The font is True Type with a Unicode encoding.
     */    
    public static final int FONT_TYPE_TTUNI = 3;
    /** A font already inside the document.
     */    
    public static final int FONT_TYPE_DOCUMENT = 4;
    /** A Type3 font.
     */    
    public static final int FONT_TYPE_T3 = 5;
    /** The Unicode encoding with horizontal writing.
     */    
    public static final String IDENTITY_H = "Identity-H";
    /** The Unicode encoding with vertical writing.
     */    
    public static final String IDENTITY_V = "Identity-V";
    
    /** A possible encoding. */    
    public static final String CP1250 = "Cp1250";
    
    /** A possible encoding. */    
    public static final String CP1252 = "Cp1252";
    
    /** A possible encoding. */    
    public static final String CP1257 = "Cp1257";
    
    /** A possible encoding. */    
    public static final String WINANSI = "Cp1252";
    
    /** A possible encoding. */    
    public static final String MACROMAN = "MacRoman";
    
    public static final int[] CHAR_RANGE_LATIN = {0, 0x17f, 0x2000, 0x206f, 0x20a0, 0x20cf, 0xfb00, 0xfb06};
    public static final int[] CHAR_RANGE_ARABIC = {0, 0x7f, 0x0600, 0x067f, 0x20a0, 0x20cf, 0xfb50, 0xfbff, 0xfe70, 0xfeff};
    public static final int[] CHAR_RANGE_HEBREW = {0, 0x7f, 0x0590, 0x05ff, 0x20a0, 0x20cf, 0xfb1d, 0xfb4f};
    public static final int[] CHAR_RANGE_CYRILLIC = {0, 0x7f, 0x0400, 0x052f, 0x2000, 0x206f, 0x20a0, 0x20cf};

/** if the font has to be embedded */
    public static final boolean EMBEDDED = true;
    
/** if the font doesn't have to be embedded */
    public static final boolean NOT_EMBEDDED = false;
/** if the font has to be cached */
    public static final boolean CACHED = true;
/** if the font doesn't have to be cached */
    public static final boolean NOT_CACHED = false;
    
    /** The path to the font resources. */    
    public static final String RESOURCE_PATH = "com/lowagie/text/pdf/fonts/";
    /** The fake CID code that represents a newline. */    
    public static final char CID_NEWLINE = '\u7fff';
    
    protected ArrayList subsetRanges;
    /** The font type.
     */    
    int fontType;
/** a not defined character in a custom PDF encoding */
    public static final String notdef = ".notdef";
    
/** table of characters widths for this encoding */
    protected int widths[] = new int[256];
    
/** encoding names */
    protected String differences[] = new String[256];
/** same as differences but with the unicode codes */
    protected char unicodeDifferences[] = new char[256];
    
    protected int charBBoxes[][] = new int[256][];
/** encoding used with this font */
    protected String encoding;
    
/** true if the font is to be embedded in the PDF */
    protected boolean embedded;
    
    /**
     * The compression level for the font stream.
     * @since	2.1.3
     */
    protected int compressionLevel = PdfStream.DEFAULT_COMPRESSION;
    
/**
 * true if the font must use it's built in encoding. In that case the
 * <CODE>encoding</CODE> is only used to map a char to the position inside
 * the font, not to the expected char name.
 */
    protected boolean fontSpecific = true;
    
/** cache for the fonts already used. */
    protected static HashMap fontCache = new HashMap();
    
/** list of the 14 built in fonts. */
    protected static final HashMap BuiltinFonts14 = new HashMap();
    
    /** Forces the output of the width array. Only matters for the 14
     * built-in fonts.
     */
    protected boolean forceWidthsOutput = false;
    
    /** Converts <CODE>char</CODE> directly to <CODE>byte</CODE>
     * by casting.
     */
    protected boolean directTextToByte = false;
    
    /** Indicates if all the glyphs and widths for that particular
     * encoding should be included in the document.
     */
    protected boolean subset = true;
    
    protected boolean fastWinansi = false;
    
    /**
     * Custom encodings use this map to key the Unicode character
     * to the single byte code.
     */
    protected IntHashtable specialMap;
    
    static {
        BuiltinFonts14.put(COURIER, PdfName.COURIER);
        BuiltinFonts14.put(COURIER_BOLD, PdfName.COURIER_BOLD);
        BuiltinFonts14.put(COURIER_BOLDOBLIQUE, PdfName.COURIER_BOLDOBLIQUE);
        BuiltinFonts14.put(COURIER_OBLIQUE, PdfName.COURIER_OBLIQUE);
        BuiltinFonts14.put(HELVETICA, PdfName.HELVETICA);
        BuiltinFonts14.put(HELVETICA_BOLD, PdfName.HELVETICA_BOLD);
        BuiltinFonts14.put(HELVETICA_BOLDOBLIQUE, PdfName.HELVETICA_BOLDOBLIQUE);
        BuiltinFonts14.put(HELVETICA_OBLIQUE, PdfName.HELVETICA_OBLIQUE);
        BuiltinFonts14.put(SYMBOL, PdfName.SYMBOL);
        BuiltinFonts14.put(TIMES_ROMAN, PdfName.TIMES_ROMAN);
        BuiltinFonts14.put(TIMES_BOLD, PdfName.TIMES_BOLD);
        BuiltinFonts14.put(TIMES_BOLDITALIC, PdfName.TIMES_BOLDITALIC);
        BuiltinFonts14.put(TIMES_ITALIC, PdfName.TIMES_ITALIC);
        BuiltinFonts14.put(ZAPFDINGBATS, PdfName.ZAPFDINGBATS);
    }
    
    /** Generates the PDF stream with the Type1 and Truetype fonts returning
     * a PdfStream.
     */
    static class StreamFont extends PdfStream {
        
        /** Generates the PDF stream with the Type1 and Truetype fonts returning
         * a PdfStream.
         * @param contents the content of the stream
         * @param lengths an array of int that describes the several lengths of each part of the font
         * @param compressionLevel	the compression level of the Stream
         * @throws DocumentException error in the stream compression
         * @since	2.1.3 (replaces the constructor without param compressionLevel)
         */
        public StreamFont(byte contents[], int lengths[], int compressionLevel) throws DocumentException {
            try {
                bytes = contents;
                put(PdfName.LENGTH, new PdfNumber(bytes.length));
                for (int k = 0; k < lengths.length; ++k) {
                    put(new PdfName("Length" + (k + 1)), new PdfNumber(lengths[k]));
                }
                flateCompress(compressionLevel);
            }
            catch (Exception e) {
                throw new DocumentException(e);
            }
        }
        
        /**
         * Generates the PDF stream for a font.
         * @param contents the content of a stream
         * @param subType the subtype of the font.
		 * @param compressionLevel	the compression level of the Stream
         * @throws DocumentException error in the stream compression
         * @since	2.1.3 (replaces the constructor without param compressionLevel)
         */
        public StreamFont(byte contents[], String subType, int compressionLevel) throws DocumentException {
            try {
                bytes = contents;
                put(PdfName.LENGTH, new PdfNumber(bytes.length));
                if (subType != null)
                    put(PdfName.SUBTYPE, new PdfName(subType));
                flateCompress(compressionLevel);
            }