cfffont.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

/*
 *
 * Copyright 2003 Sivan Toledo
 *
 * 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.
 *
 * 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.
 *
 */

/*
 * Comments by Sivan Toledo:
 * I created this class in order to add to iText the ability to utilize
 * OpenType fonts with CFF glyphs (these usually have an .otf extension).
 * The CFF font within the CFF table of the OT font might be either a CID
 * or a Type1 font. (CFF fonts may also contain multiple fonts; I do not
 * know if this is allowed in an OT table). The PDF spec, however, only
 * allow a CID font with an Identity-H or Identity-V encoding. Otherwise,
 * you are limited to an 8-bit encoding.
 * Adobe fonts come in both flavors. That is, the OTFs sometimes have
 * a CID CFF inside (for Japanese fonts), and sometimes a Type1 CFF
 * (virtually all the others, Latin/Greek/Cyrillic). So to easily use
 * all the glyphs in the latter, without creating multiple 8-bit encoding,
 * I wrote this class, whose main purpose is to convert a Type1 font inside
 * a CFF container (which might include other fonts) into a CID CFF font
 * that can be directly embeded in the PDF.
 *
 * Limitations of the current version:
 * 1. It does not extract a single CID font from a CFF that contains that
 *    particular CID along with other fonts. The Adobe Japanese OTF's that
 *    I have only have one font in the CFF table, so these can be
 *    embeded in the PDF as is.
 * 2. It does not yet subset fonts.
 * 3. It may or may not work on CFF fonts that are not within OTF's.
 *    I didn't try that. In any case, that would probably only be
 *    useful for subsetting CID fonts, not for CFF Type1 fonts (I don't
 *    think there are any available.
 * I plan to extend the class to support these three features at some
 * future time.
 */

package com.lowagie.text.pdf;

import java.util.Iterator;
import java.util.LinkedList;

import com.lowagie.text.ExceptionConverter;

public class CFFFont {
    
    static final String operatorNames[] = {
        "version", "Notice", "FullName", "FamilyName",
        "Weight", "FontBBox", "BlueValues", "OtherBlues",
        "FamilyBlues", "FamilyOtherBlues", "StdHW", "StdVW",
        "UNKNOWN_12", "UniqueID", "XUID", "charset",
        "Encoding", "CharStrings", "Private", "Subrs",
        "defaultWidthX", "nominalWidthX", "UNKNOWN_22", "UNKNOWN_23",
        "UNKNOWN_24", "UNKNOWN_25", "UNKNOWN_26", "UNKNOWN_27",
        "UNKNOWN_28", "UNKNOWN_29", "UNKNOWN_30", "UNKNOWN_31",
        "Copyright", "isFixedPitch", "ItalicAngle", "UnderlinePosition",
        "UnderlineThickness", "PaintType", "CharstringType", "FontMatrix",
        "StrokeWidth", "BlueScale", "BlueShift", "BlueFuzz",
        "StemSnapH", "StemSnapV", "ForceBold", "UNKNOWN_12_15",
        "UNKNOWN_12_16", "LanguageGroup", "ExpansionFactor", "initialRandomSeed",
        "SyntheticBase", "PostScript", "BaseFontName", "BaseFontBlend",
        "UNKNOWN_12_24", "UNKNOWN_12_25", "UNKNOWN_12_26", "UNKNOWN_12_27",
        "UNKNOWN_12_28", "UNKNOWN_12_29", "ROS", "CIDFontVersion",
        "CIDFontRevision", "CIDFontType", "CIDCount", "UIDBase",
        "FDArray", "FDSelect", "FontName"
    };
    
    static final String standardStrings[] = {
        // Automatically generated from Appendix A of the CFF specification; do
        // not edit. Size should be 391.
        ".notdef", "space", "exclam", "quotedbl", "numbersign", "dollar",
        "percent", "ampersand", "quoteright", "parenleft", "parenright",
        "asterisk", "plus", "comma", "hyphen", "period", "slash", "zero", "one",
        "two", "three", "four", "five", "six", "seven", "eight", "nine", "colon",
        "semicolon", "less", "equal", "greater", "question", "at", "A", "B", "C",
        "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",
        "S", "T", "U", "V", "W", "X", "Y", "Z", "bracketleft", "backslash",
        "bracketright", "asciicircum", "underscore", "quoteleft", "a", "b", "c",
        "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r",
        "s", "t", "u", "v", "w", "x", "y", "z", "braceleft", "bar", "braceright",
        "asciitilde", "exclamdown", "cent", "sterling", "fraction", "yen",
        "florin", "section", "currency", "quotesingle", "quotedblleft",
        "guillemotleft", "guilsinglleft", "guilsinglright", "fi", "fl", "endash",
        "dagger", "daggerdbl", "periodcentered", "paragraph", "bullet",
        "quotesinglbase", "quotedblbase", "quotedblright", "guillemotright",
        "ellipsis", "perthousand", "questiondown", "grave", "acute", "circumflex",
        "tilde", "macron", "breve", "dotaccent", "dieresis", "ring", "cedilla",
        "hungarumlaut", "ogonek", "caron", "emdash", "AE", "ordfeminine", "Lslash",
        "Oslash", "OE", "ordmasculine", "ae", "dotlessi", "lslash", "oslash", "oe",
        "germandbls", "onesuperior", "logicalnot", "mu", "trademark", "Eth",
        "onehalf", "plusminus", "Thorn", "onequarter", "divide", "brokenbar",
        "degree", "thorn", "threequarters", "twosuperior", "registered", "minus",
        "eth", "multiply", "threesuperior", "copyright", "Aacute", "Acircumflex",
        "Adieresis", "Agrave", "Aring", "Atilde", "Ccedilla", "Eacute",
        "Ecircumflex", "Edieresis", "Egrave", "Iacute", "Icircumflex", "Idieresis",
        "Igrave", "Ntilde", "Oacute", "Ocircumflex", "Odieresis", "Ograve",
        "Otilde", "Scaron", "Uacute", "Ucircumflex", "Udieresis", "Ugrave",
        "Yacute", "Ydieresis", "Zcaron", "aacute", "acircumflex", "adieresis",
        "agrave", "aring", "atilde", "ccedilla", "eacute", "ecircumflex",
        "edieresis", "egrave", "iacute", "icircumflex", "idieresis", "igrave",
        "ntilde", "oacute", "ocircumflex", "odieresis", "ograve", "otilde",
        "scaron", "uacute", "ucircumflex", "udieresis", "ugrave", "yacute",
        "ydieresis", "zcaron", "exclamsmall", "Hungarumlautsmall",
        "dollaroldstyle", "dollarsuperior", "ampersandsmall", "Acutesmall",
        "parenleftsuperior", "parenrightsuperior", "twodotenleader",
        "onedotenleader", "zerooldstyle", "oneoldstyle", "twooldstyle",
        "threeoldstyle", "fouroldstyle", "fiveoldstyle", "sixoldstyle",
        "sevenoldstyle", "eightoldstyle", "nineoldstyle", "commasuperior",
        "threequartersemdash", "periodsuperior", "questionsmall", "asuperior",
        "bsuperior", "centsuperior", "dsuperior", "esuperior", "isuperior",
        "lsuperior", "msuperior", "nsuperior", "osuperior", "rsuperior",
        "ssuperior", "tsuperior", "ff", "ffi", "ffl", "parenleftinferior",
        "parenrightinferior", "Circumflexsmall", "hyphensuperior", "Gravesmall",
        "Asmall", "Bsmall", "Csmall", "Dsmall", "Esmall", "Fsmall", "Gsmall",
        "Hsmall", "Ismall", "Jsmall", "Ksmall", "Lsmall", "Msmall", "Nsmall",
        "Osmall", "Psmall", "Qsmall", "Rsmall", "Ssmall", "Tsmall", "Usmall",
        "Vsmall", "Wsmall", "Xsmall", "Ysmall", "Zsmall", "colonmonetary",
        "onefitted", "rupiah", "Tildesmall", "exclamdownsmall", "centoldstyle",
        "Lslashsmall", "Scaronsmall", "Zcaronsmall", "Dieresissmall", "Brevesmall",
        "Caronsmall", "Dotaccentsmall", "Macronsmall", "figuredash",
        "hypheninferior", "Ogoneksmall", "Ringsmall", "Cedillasmall",
        "questiondownsmall", "oneeighth", "threeeighths", "fiveeighths",
        "seveneighths", "onethird", "twothirds", "zerosuperior", "foursuperior",
        "fivesuperior", "sixsuperior", "sevensuperior", "eightsuperior",
        "ninesuperior", "zeroinferior", "oneinferior", "twoinferior",
        "threeinferior", "fourinferior", "fiveinferior", "sixinferior",
        "seveninferior", "eightinferior", "nineinferior", "centinferior",
        "dollarinferior", "periodinferior", "commainferior", "Agravesmall",
        "Aacutesmall", "Acircumflexsmall", "Atildesmall", "Adieresissmall",
        "Aringsmall", "AEsmall", "Ccedillasmall", "Egravesmall", "Eacutesmall",
        "Ecircumflexsmall", "Edieresissmall", "Igravesmall", "Iacutesmall",
        "Icircumflexsmall", "Idieresissmall", "Ethsmall", "Ntildesmall",
        "Ogravesmall", "Oacutesmall", "Ocircumflexsmall", "Otildesmall",
        "Odieresissmall", "OEsmall", "Oslashsmall", "Ugravesmall", "Uacutesmall",
        "Ucircumflexsmall", "Udieresissmall", "Yacutesmall", "Thornsmall",
        "Ydieresissmall", "001.000", "001.001", "001.002", "001.003", "Black",
        "Bold", "Book", "Light", "Medium", "Regular", "Roman", "Semibold"
    };
    
    //private String[] strings;
    public String getString(char sid) {
        if (sid < standardStrings.length) return standardStrings[sid];
        if (sid >= standardStrings.length+(stringOffsets.length-1)) return null;
        int j = sid - standardStrings.length;
        //java.lang.System.err.println("going for "+j);
        int p = getPosition();
        seek(stringOffsets[j]);
        StringBuffer s = new StringBuffer();
        for (int k=stringOffsets[j]; k<stringOffsets[j+1]; k++) {
            s.append(getCard8());
        }
        seek(p);
        return s.toString();
    }
    
    char getCard8() {
        try {
            byte i = buf.readByte();
            return (char)(i & 0xff);
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    
    char getCard16() {
        try {
            return buf.readChar();
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    
    int getOffset(int offSize) {
        int offset = 0;
        for (int i=0; i<offSize; i++) {
            offset *= 256;
            offset += getCard8();
        }
        return offset;
    }
    
    void seek(int offset) {
        try {
            buf.seek(offset);
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    
    short getShort() {
        try {
            return buf.readShort();
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    
    int getInt() {
        try {
            return buf.readInt();
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    
    int getPosition() {
        try {
            return buf.getFilePointer();
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }
    int nextIndexOffset;
    // read the offsets in the next index
    // data structure, convert to global
    // offsets, and return them.
    // Sets the nextIndexOffset.
    int[] getIndex(int nextIndexOffset) {
        int count, indexOffSize;
        
        seek(nextIndexOffset);
        count = getCard16();
        int[] offsets = new int[count+1];
        
        if (count==0) {
            offsets[0] = -1;
            nextIndexOffset += 2;
            return offsets;
        }
        
        indexOffSize = getCard8();
        
        for (int j=0; j<=count; j++) {
        	//nextIndexOffset = ofset to relative segment
            offsets[j] = nextIndexOffset
			//2-> count in the index header. 1->offset size in index header
            + 2+1
			//offset array size * offset size 
            + (count+1)*indexOffSize
			//???zero <-> one base
            - 1
			// read object offset relative to object array base 
            + getOffset(indexOffSize);
        }
        //nextIndexOffset = offsets[count];
        return offsets;
    }
    
    protected String   key;
    protected Object[] args      = new Object[48];
    protected int      arg_count = 0;
    
    protected void getDictItem() {
        for (int i=0; i<arg_count; i++) args[i]=null;
        arg_count = 0;
        key = null;
        boolean gotKey = false;