type1font.java

一个java操作pdf文件的开发包,很好用的.

/*
 * $Id: Type1Font.java,v 1.34 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 com.lowagie.text.ExceptionConverter;
import com.lowagie.text.DocumentException;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.io.*;

/** Reads a Type1 font
 *
 * @author Paulo Soares ([e-mail])
 */
class Type1Font extends BaseFont
{
    /** The PFB file if the input was made with a <CODE>byte</CODE> array.
     */    
    protected byte pfb[];
/** The Postscript font name.
 */
    private String FontName;
/** The full name of the font.
 */
    private String FullName;
/** The family name of the font.
 */
    private String FamilyName;
/** The weight of the font: normal, bold, etc.
 */
    private String Weight = "";
/** The italic angle of the font, usually 0.0 or negative.
 */
    private float ItalicAngle = 0.0f;
/** <CODE>true</CODE> if all the characters have the same
 *  width.
 */
    private boolean IsFixedPitch = false;
/** The character set of the font.
 */
    private String CharacterSet;
/** The llx of the FontBox.
 */
    private int llx = -50;
/** The lly of the FontBox.
 */
    private int lly = -200;
/** The lurx of the FontBox.
 */
    private int urx = 1000;
/** The ury of the FontBox.
 */
    private int ury = 900;
/** The underline position.
 */
    private int UnderlinePosition = -100;
/** The underline thickness.
 */
    private int UnderlineThickness = 50;
/** The font's encoding name. This encoding is 'StandardEncoding' or
 *  'AdobeStandardEncoding' for a font that can be totally encoded
 *  according to the characters names. For all other names the
 *  font is treated as symbolic.
 */
    private String EncodingScheme = "FontSpecific";
/** A variable.
 */
    private int CapHeight = 700;
/** A variable.
 */
    private int XHeight = 480;
/** A variable.
 */
    private int Ascender = 800;
/** A variable.
 */
    private int Descender = -200;
/** A variable.
 */
    private int StdHW;
/** A variable.
 */
    private int StdVW = 80;
    
/** Represents the section CharMetrics in the AFM file. Each
 *  element of this array contains a <CODE>Object[3]</CODE> with an
 *  Integer, Integer and String. This is the code, width and name.
 */
    private ArrayList CharMetrics = new ArrayList();
/** Represents the section KernPairs in the AFM file. The key is
 *  the name of the first character and the value is a <CODE>Object[]</CODE>
 *  with 2 elements for each kern pair. Position 0 is the name of
 *  the second character and position 1 is the kerning distance. This is
 *  repeated for all the pairs.
 */
    private HashMap KernPairs = new HashMap();
/** The file in use.
 */
    private String fileName;
/** <CODE>true</CODE> if this font is one of the 14 built in fonts.
 */
    private boolean builtinFont = false;
/** Types of records in a PFB file. ASCII is 1 and BINARY is 2.
 *  They have to appear in the PFB file in this sequence.
 */
    private static final int pfbTypes[] = {1, 2, 1};
    
    /** Creates a new Type1 font.
     * @param ttfAfm the AFM file if the input is made with a <CODE>byte</CODE> array
     * @param pfb the PFB file if the input is made with a <CODE>byte</CODE> array
     * @param afmFile the name of one of the 14 built-in fonts or the location of an AFM file. The file must end in '.afm'
     * @param enc the encoding to be applied to this font
     * @param emb true if the font is to be embedded in the PDF
     * @throws DocumentException the AFM file is invalid
     * @throws IOException the AFM file could not be read
     */
    Type1Font(String afmFile, String enc, boolean emb, byte ttfAfm[], byte pfb[]) throws DocumentException, IOException
    {
        if (emb && ttfAfm != null && pfb == null)
            throw new DocumentException("Two byte arrays are needed if the Type1 font is embedded.");
        if (emb && ttfAfm != null)
            this.pfb = pfb;
        encoding = enc;
        embedded = emb;
        fileName = afmFile;
        fontType = FONT_TYPE_T1;
        RandomAccessFileOrArray rf = null;
        InputStream is = null;
        if (BuiltinFonts14.containsKey(afmFile)) {
            embedded = false;
            builtinFont = true;
            byte buf[] = new byte[1024];
            try {
                is = getResourceStream(afmFile + ".afm");
                if (is == null) {
                    String msg = afmFile + " not found as resource. (The *.afm files must exist as resources in the package com.lowagie.text.pdf.fonts)";
                    System.err.println(msg);
                    throw new DocumentException(msg);
                }
                ByteArrayOutputStream out = new ByteArrayOutputStream();
                while (true) {
                    int size = is.read(buf);
                    if (size < 0)
                        break;
                    out.write(buf, 0, size);
                }
                buf = out.toByteArray();
            }
            finally {
                if (is != null) {
                    try {
                        is.close();
                    }
                    catch (Exception e) {
                        // empty on purpose
                    }
                }
            }
            try {
                rf = new RandomAccessFileOrArray(buf);
                process(rf);
            }
            finally {
                if (rf != null) {
                    try {
                        rf.close();
                    }
                    catch (Exception e) {
                        // empty on purpose
                    }
                }
            }
        }
        else if (afmFile.toLowerCase().endsWith(".afm")) {
            try {
                if (ttfAfm == null)
                    rf = new RandomAccessFileOrArray(afmFile);
                else
                    rf = new RandomAccessFileOrArray(ttfAfm);
                process(rf);
            }
            finally {
                if (rf != null) {
                    try {
                        rf.close();
                    }
                    catch (Exception e) {
                        // empty on purpose
                    }
                }
            }
        }
        else
            throw new DocumentException(afmFile + " is not an AFM font file.");
        try {
            EncodingScheme = EncodingScheme.trim();
            if (EncodingScheme.equals("AdobeStandardEncoding") || EncodingScheme.equals("StandardEncoding")) {
                fontSpecific = false;
            }
            " ".getBytes(enc); // check if the encoding exists
            createEncoding();
        }
        catch (Exception e) {
            throw new DocumentException(e.getMessage());
        }
    }
    
/** Gets the width from the font according to the <CODE>name</CODE> or,
 * if the <CODE>name</CODE> is null, meaning it is a symbolic font,
 * the char <CODE>c</CODE>.
 * @param c the char if the font is symbolic
 * @param name the glyph name
 * @return the width of the char
 */
    protected int getRawWidth(int c, String name)
    {
        try {
            if (name == null) { // font specific
                for (int k = 0; k < CharMetrics.size(); ++k) {
                    Object metrics[] = (Object[])CharMetrics.get(k);
                    if (((Integer)(metrics[0])).intValue() == c)
                        return ((Integer)(metrics[1])).intValue();
                }
            }
            else {
                if (name.equals(".notdef"))
                    return 0;
                for (int k = 0; k < CharMetrics.size(); ++k) {
                    Object metrics[] = (Object[])CharMetrics.get(k);
                    if (name.equals(metrics[2]))
                        return ((Integer)(metrics[1])).intValue();
                }
            }
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
        return 0;
    }
    
/** Gets the kerning between two Unicode characters. The characters
 * are converted to names and this names are used to find the kerning
 * pairs in the <CODE>HashMap</CODE> <CODE>KernPairs</CODE>.
 * @param char1 the first char
 * @param char2 the second char
 * @return the kerning to be applied
 */
    public int getKerning(char char1, char char2)
    {
        String first = GlyphList.unicodeToName((int)char1);
        if (first == null)
            return 0;
        String second = GlyphList.unicodeToName((int)char2);
        if (second == null)
            return 0;
        Object obj[] = (Object[])KernPairs.get(first);
        if (obj == null)
            return 0;
        for (int k = 0; k < obj.length; k += 2) {
            if (second.equals(obj[k]))
                return ((Integer)obj[k + 1]).intValue();
        }
        return 0;
    }
    
    
    /** Reads the font metrics
     * @param rf the AFM file
     * @throws DocumentException the AFM file is invalid
     * @throws IOException the AFM file could not be read
     */
    public void process(RandomAccessFileOrArray rf) throws DocumentException, IOException
    {
        String line;
        boolean isMetrics = false;
        while ((line = rf.readLine()) != null)
        {
            StringTokenizer tok = new StringTokenizer(line);
            if (!tok.hasMoreTokens())
                continue;
            String ident = tok.nextToken();
            if (ident.equals("FontName"))
                FontName = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("FullName"))
                FullName = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("FamilyName"))
                FamilyName = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("Weight"))
                Weight = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("ItalicAngle"))
                ItalicAngle = Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("IsFixedPitch"))
                IsFixedPitch = tok.nextToken().equals("true");
            else if (ident.equals("CharacterSet"))
                CharacterSet = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("FontBBox"))
            {
                llx = (int)Float.valueOf(tok.nextToken()).floatValue();
                lly = (int)Float.valueOf(tok.nextToken()).floatValue();
                urx = (int)Float.valueOf(tok.nextToken()).floatValue();
                ury = (int)Float.valueOf(tok.nextToken()).floatValue();
            }
            else if (ident.equals("UnderlinePosition"))
                UnderlinePosition = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("UnderlineThickness"))
                UnderlineThickness = (int)Float.valueOf(tok.nextToken()).floatValue();
            else if (ident.equals("EncodingScheme"))
                EncodingScheme = tok.nextToken("\u00ff").substring(1);
            else if (ident.equals("CapHeight"))
                CapHeight = (int)Float.valueOf(tok.nextToken()).floatValue();