type1font.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: Type1Font.java 2509 2006-12-21 16:26:19Z psoares33 $
 * $Name$
 *
 * Copyright 2001-2006 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.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.StringTokenizer;

import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.fonts.FontsResourceAnchor;

/** Reads a Type1 font
 *
 * @author Paulo Soares ([e-mail])
 */
class Type1Font extends BaseFont
{
    private static FontsResourceAnchor resourceAnchor;
    
    /** 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
 *  value of this array contains a <CODE>Object[4]</CODE> with an
 *  Integer, Integer, String and int[]. This is the code, width, name and char bbox.
 *  The key is the name of the char and also an Integer with the char number.
 */
    private HashMap CharMetrics = new HashMap();
/** 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 PFB_TYPES[] = {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 {
                if (resourceAnchor == null)
                    resourceAnchor = new FontsResourceAnchor();
                is = getResourceStream(RESOURCE_PATH + afmFile + ".afm", resourceAnchor.getClass().getClassLoader());
                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 if (afmFile.toLowerCase().endsWith(".pfm")) {
            try {
                ByteArrayOutputStream ba = new ByteArrayOutputStream();
                if (ttfAfm == null)
                    rf = new RandomAccessFileOrArray(afmFile);
                else
                    rf = new RandomAccessFileOrArray(ttfAfm);
                Pfm2afm.convert(rf, ba);
                rf.close();
                rf = new RandomAccessFileOrArray(ba.toByteArray());
                process(rf);
            }
            finally {
                if (rf != null) {
                    try {
                        rf.close();
                    }
                    catch (Exception e) {
                        // empty on purpose
                    }
                }
            }