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/*
 * $Id: BaseFont.java 4065 2009-09-16 23:09:11Z psoares33 $
 *
 * 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:
 * https://github.com/LibrePDF/OpenPDF
 */

package com.lowagie.text.pdf;

import com.lowagie.text.DocumentException;
import com.lowagie.text.error_messages.MessageLocalization;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.StringTokenizer;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Base class for the several font types supported
 * 
 * @author Paulo Soares ([email protected])
 */

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 underline 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 its built in encoding. In that case the
     * encoding 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 ConcurrentHashMap fontCache = new ConcurrentHashMap<>(
            500, 0.85f, 64);

    /** 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 char directly to byte 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);
            } catch (Exception e) {
                throw new DocumentException(e);
            }
        }
    }

    /**
     * Creates new BaseFont
     */
    protected BaseFont() {
    }

    /**
     * Creates a new font. This will always be the default Helvetica font (not
     * embedded). This method is introduced because Helvetica is used in many
     * examples.
     * 
     * @return a BaseFont object (Helvetica, Winansi, not embedded)
     * @throws IOException
     *             This shouldn't occur ever
     * @throws DocumentException
     *             This shouldn't occur ever
     * @since 2.1.1
     */
    public static BaseFont createFont() throws DocumentException, IOException {
        return createFont(BaseFont.HELVETICA, BaseFont.WINANSI,
                BaseFont.NOT_EMBEDDED);
    }

    /**
     * Creates a new font. This font can be one of the 14 built in types, a
     * Type1 font referred to by an AFM or PFM file, a TrueType font (simple or
     * collection) or a CJK font from the Adobe Asian Font Pack. TrueType fonts
     * and CJK fonts can have an optional style modifier appended to the name.
     * These modifiers are: Bold, Italic and BoldItalic. An example would be
     * "STSong-Light,Bold". Note that this modifiers do not work if the font is
     * embedded. Fonts in TrueType collections are addressed by index such as
     * "msgothic.ttc,1". This would get the second font (indexes start at 0), in
     * this case "MS PGothic".
     * 
     * The fonts are cached and if they already exist they are extracted from
     * the cache, not parsed again.
     * 

     * Besides the common encodings described by name, custom encodings can also
     * be made. These encodings will only work for the single byte fonts Type1
     * and TrueType. The encoding string starts with a '#' followed by "simple"
     * or "full". If "simple" there is a decimal for the first character
     * position and then a list of hex values representing the Unicode codes
     * that compose that encoding.

     * The "simple" encoding is recommended for TrueType fonts as the "full"
     * encoding risks not matching the character with the right glyph if not
     * done with care.

     * The "full" encoding is specially aimed at Type1 fonts where the glyphs
     * have to be described by non standard names like the Tex math fonts. Each
     * group of three elements compose a code position: the one byte code order
     * in decimal or as 'x' (x cannot be the space), the name and the Unicode
     * character used to access the glyph. The space must be assigned to
     * character position 32 otherwise text justification will not work.
     * 

     * Example for a "simple" encoding that includes the Unicode character
     * space, A, B and ecyrillic:
     * 
     * 
     * "# simple 32 0020 0041 0042 0454"
     * 
     * 
     * Example for a "full" encoding for a Type1 Tex font:
     * 
     * 
     * "# full 'A' nottriangeqlleft 0041 'B' dividemultiply 0042 32 space 0020"
     * 
     * 
     * This method calls:

     * 
     * 
     * createFont(name, encoding, embedded, true, null, null);
     * 
     * 
     * @param name
     *            the name of the font or its location on file
     * @param encoding
     *            the encoding to be applied to this font
     * @param embedded
     *            true if the font is to be embedded in the PDF
     * @return returns a new font. This font may come from the cache
     * @throws DocumentException
     *             the font is invalid
     * @throws IOException
     *             the font file could not be read
     */
    public static BaseFont createFont(String name, String encoding,
            boolean embedded) throws DocumentException, IOException {
        return createFont(name, encoding, embedded, true, null, null, false);
    }

    /**
     * Creates a new font. This font can be one of the 14 built in types, a
     * Type1 font referred to by an AFM or PFM file, a TrueType font (simple or
     * collection) or a CJK font from the Adobe Asian Font Pack. TrueType fonts
     * and CJK fonts can have an optional style modifier appended to the name.
     * These modifiers are: Bold, Italic and BoldItalic. An example would be
     * "STSong-Light,Bold". Note that this modifiers do not work if the font is
     * embedded. Fonts in TrueType collections are addressed by index such as
     * "msgothic.ttc,1". This would get the second font (indexes start at 0), in
     * this case "MS PGothic".
     * 
     * The fonts are cached and if they already exist they are extracted from
     * the cache, not parsed again.
     * 

     * Besides the common encodings described by name, custom encodings can also
     * be made. These encodings will only work for the single byte fonts Type1
     * and TrueType. The encoding string starts with a '#' followed by "simple"
     * or "full". If "simple" there is a decimal for the first character
     * position and then a list of hex values representing the Unicode codes
     * that compose that encoding.

     * The "simple" encoding is recommended for TrueType fonts as the "full"
     * encoding risks not matching the character with the right glyph if not
     * done with care.

     * The "full" encoding is specially aimed at Type1 fonts where the glyphs
     * have to be described by non standard names like the Tex math fonts. Each
     * group of three elements compose a code position: the one byte code order
     * in decimal or as 'x' (x cannot be the space), the name and the Unicode
     * character used to access the glyph. The space must be assigned to
     * character position 32 otherwise text justification will not work.
     * 

     * Example for a "simple" encoding that includes the Unicode character
     * space, A, B and ecyrillic:
     * 
     * 
     * "# simple 32 0020 0041 0042 0454"
     * 
     * 
     * Example for a "full" encoding for a Type1 Tex font:
     * 
     * 
     * "# full 'A' nottriangeqlleft 0041 'B' dividemultiply 0042 32 space 0020"
     * 
     * 
     * This method calls:

     * 
     * 
     * createFont(name, encoding, embedded, true, null, null);
     * 
     * 
     * @param name
     *            the name of the font or its location on file
     * @param encoding
     *            the encoding to be applied to this font
     * @param embedded
     *            true if the font is to be embedded in the PDF
     * @param forceRead
     *            in some cases (TrueTypeFont, Type1Font), the full font file
     *            will be read and kept in memory if forceRead is true
     * @return returns a new font. This font may come from the cache
     * @throws DocumentException
     *             the font is invalid
     * @throws IOException
     *             the font file could not be read
     * @since 2.1.5
     */
    public static BaseFont createFont(String name, String encoding,
            boolean embedded, boolean forceRead) throws DocumentException,
            IOException {
        return createFont(name, encoding, embedded, true, null, null, forceRead);
    }

    /**
     * Creates a new font. This font can be one of the 14 built in types, a
     * Type1 font referred to by an AFM or PFM file, a TrueType font (simple or
     * collection) or a CJK font from the Adobe Asian Font Pack. TrueType fonts
     * and CJK fonts can have an optional style modifier appended to the name.
     * These modifiers are: Bold, Italic and BoldItalic. An example would be
     * "STSong-Light,Bold". Note that this modifiers do not work if the font is
     * embedded. Fonts in TrueType collections are addressed by index such as
     * "msgothic.ttc,1". This would get the second font (indexes start at 0), in
     * this case "MS PGothic".
     * 
     * The fonts may or may not be cached depending on the flag
     * cached. If the byte arrays are present the font
     * will be read from them instead of the name. A name is still required to
     * identify the font type.
     * 

     * Besides the common encodings described by name, custom encodings can also
     * be made. These encodings will only work for the single byte fonts Type1
     * and TrueType. The encoding string starts with a '#' followed by "simple"
     * or "full". If "simple" there is a decimal for the first character
     * position and then a list of hex values representing the Unicode codes
     * that compose that encoding.

     * The "simple" encoding is recommended for TrueType fonts as the "full"
     * encoding risks not matching the character with the right glyph if not
     * done with care.

     * The "full" encoding is specially aimed at Type1 fonts where the glyphs
     * have to be described by non standard names like the Tex math fonts. Each
     * group of three elements compose a code position: the one byte code order
     * in decimal or as 'x' (x cannot be the space), the name and the Unicode
     * character used to access the glyph. The space must be assigned to
     * character position 32 otherwise text justification will not work.
     * 

     * Example for a "simple" encoding that includes the Unicode character
     * space, A, B and ecyrillic:
     * 
     * 
     * "# simple 32 0020 0041 0042 0454"
     * 
     * 
     * Example for a "full" encoding for a Type1 Tex font:
     * 
     * 
     * "# full 'A' nottriangeqlleft 0041 'B' dividemultiply 0042 32 space 0020"
     * 
     * 
     * @param name
     *            the name of the font or its location on file
     * @param encoding
     *            the encoding to be applied to this font
     * @param embedded
     *            true if the font is to be embedded in the PDF
     * @param cached
     *            true if the font comes from the cache or is added to the cache
     *            if new, false if the font is always created new
     * @param ttfAfm
     *            the true type font or the afm in a byte array
     * @param pfb
     *            the pfb in a byte array
     * @return returns a new font. This font may come from the cache but only if
     *         cached is true, otherwise it will always be created new
     * @throws DocumentException
     *             the font is invalid
     * @throws IOException
     *             the font file could not be read
     * @since iText 0.80
     */
    public static BaseFont createFont(String name, String encoding,
                                      boolean embedded, boolean cached, byte[] ttfAfm, byte[] pfb)
            throws DocumentException, IOException {
        return createFont(name, encoding, embedded, cached, ttfAfm, pfb, false);
    }

    /**
     * Creates a new font. This font can be one of the 14 built in types, a
     * Type1 font referred to by an AFM or PFM file, a TrueType font (simple or
     * collection) or a CJK font from the Adobe Asian Font Pack. TrueType fonts
     * and CJK fonts can have an optional style modifier appended to the name.
     * These modifiers are: Bold, Italic and BoldItalic. An example would be
     * "STSong-Light,Bold". Note that this modifiers do not work if the font is
     * embedded. Fonts in TrueType collections are addressed by index such as
     * "msgothic.ttc,1". This would get the second font (indexes start at 0), in
     * this case "MS PGothic".
     * 
     * The fonts may or may not be cached depending on the flag
     * cached. If the byte arrays are present the font
     * will be read from them instead of the name. A name is still required to
     * identify the font type.
     * 

     * Besides the common encodings described by name, custom encodings can also
     * be made. These encodings will only work for the single byte fonts Type1
     * and TrueType. The encoding string starts with a '#' followed by "simple"
     * or "full". If "simple" there is a decimal for the first character
     * position and then a list of hex values representing the Unicode codes
     * that compose that encoding.

     * The "simple" encoding is recommended for TrueType fonts as the "full"
     * encoding risks not matching the character with the right glyph if not
     * done with care.

     * The "full" encoding is specially aimed at Type1 fonts where the glyphs
     * have to be described by non standard names like the Tex math fonts. Each
     * group of three elements compose a code position: the one byte code order
     * in decimal or as 'x' (x cannot be the space), the name and the Unicode
     * character used to access the glyph. The space must be assigned to
     * character position 32 otherwise text justification will not work.
     * 

     * Example for a "simple" encoding that includes the Unicode character
     * space, A, B and ecyrillic:
     * 
     * 
     * "# simple 32 0020 0041 0042 0454"
     * 
     * 
     * Example for a "full" encoding for a Type1 Tex font:
     * 
     * 
     * "# full 'A' nottriangeqlleft 0041 'B' dividemultiply 0042 32 space 0020"
     * 
     * 
     * @param name
     *            the name of the font or its location on file
     * @param encoding
     *            the encoding to be applied to this font
     * @param embedded
     *            true if the font is to be embedded in the PDF
     * @param cached
     *            true if the font comes from the cache or is added to the cache
     *            if new, false if the font is always created new
     * @param ttfAfm
     *            the true type font or the afm in a byte array
     * @param pfb
     *            the pfb in a byte array
     * @param noThrow
     *            if true will not throw an exception if the font is not
     *            recognized and will return null, if false will throw an
     *            exception if the font is not recognized. Note that even if
     *            true an exception may be thrown in some circumstances. This
     *            parameter is useful for FontFactory that may have to check
     *            many invalid font names before finding the right one
     * @return returns a new font. This font may come from the cache but only if
     *         cached is true, otherwise it will always be created new
     * @throws DocumentException
     *             the font is invalid
     * @throws IOException
     *             the font file could not be read
     * @since 2.0.3
     */
    public static BaseFont createFont(String name, String encoding,
                                      boolean embedded, boolean cached, byte[] ttfAfm, byte[] pfb,
                                      boolean noThrow) throws DocumentException, IOException {
        return createFont(name, encoding, embedded, cached, ttfAfm, pfb, false,
                false);
    }

    /**
     * Creates a new font. This font can be one of the 14 built in types, a
     * Type1 font referred to by an AFM or PFM file, a TrueType font (simple or
     * collection) or a CJK font from the Adobe Asian Font Pack. TrueType fonts
     * and CJK fonts can have an optional style modifier appended to the name.
     * These modifiers are: Bold, Italic and BoldItalic. An example would be
     * "STSong-Light,Bold". Note that this modifiers do not work if the font is
     * embedded. Fonts in TrueType collections are addressed by index such as
     * "msgothic.ttc,1". This would get the second font (indexes start at 0), in
     * this case "MS PGothic".
     * 
     * The fonts may or may not be cached depending on the flag
     * cached. If the byte arrays are present the font
     * will be read from them instead of the name. A name is still required to
     * identify the font type.
     * 

     * Besides the common encodings described by name, custom encodings can also
     * be made. These encodings will only work for the single byte fonts Type1
     * and TrueType. The encoding string starts with a '#' followed by "simple"
     * or "full". If "simple" there is a decimal for the first character
     * position and then a list of hex values representing the Unicode codes
     * that compose that encoding.

     * The "simple" encoding is recommended for TrueType fonts as the "full"
     * encoding risks not matching the character with the right glyph if not
     * done with care.

     * The "full" encoding is specially aimed at Type1 fonts where the glyphs
     * have to be described by non standard names like the Tex math fonts. Each
     * group of three elements compose a code position: the one byte code order
     * in decimal or as 'x' (x cannot be the space), the name and the Unicode
     * character used to access the glyph. The space must be assigned to
     * character position 32 otherwise text justification will not work.
     * 

     * Example for a "simple" encoding that includes the Unicode character
     * space, A, B and ecyrillic:
     * 
     * 
     * "# simple 32 0020 0041 0042 0454"
     * 
     * 
     * Example for a "full" encoding for a Type1 Tex font:
     * 
     * 
     * "# full 'A' nottriangeqlleft 0041 'B' dividemultiply 0042 32 space 0020"
     * 
     * 
     * @param name
     *            the name of the font or its location on file
     * @param encoding
     *            the encoding to be applied to this font
     * @param embedded
     *            true if the font is to be embedded in the PDF
     * @param cached
     *            true if the font comes from the cache or is added to the cache
     *            if new, false if the font is always created new
     * @param ttfAfm
     *            the true type font or the afm in a byte array
     * @param pfb
     *            the pfb in a byte array
     * @param noThrow
     *            if true will not throw an exception if the font is not
     *            recognized and will return null, if false will throw an
     *            exception if the font is not recognized. Note that even if
     *            true an exception may be thrown in some circumstances. This
     *            parameter is useful for FontFactory that may have to check
     *            many invalid font names before finding the right one
     * @param forceRead
     *            in some cases (TrueTypeFont, Type1Font), the full font file
     *            will be read and kept in memory if forceRead is true
     * @return returns a new font. This font may come from the cache but only if
     *         cached is true, otherwise it will always be created new
     * @throws DocumentException
     *             the font is invalid
     * @throws IOException
     *             the font file could not be read
     * @since 2.1.5
     */
    public static BaseFont createFont(String name, String encoding,
                                      boolean embedded, boolean cached, byte[] ttfAfm, byte[] pfb,
                                      boolean noThrow, boolean forceRead) throws DocumentException,
            IOException {
        String nameBase = getBaseName(name);
        encoding = normalizeEncoding(encoding);
        boolean isBuiltinFonts14 = BuiltinFonts14.containsKey(name);
        boolean isCJKFont = !isBuiltinFonts14 && CJKFont.isCJKFont(
                nameBase, encoding);
        if (isBuiltinFonts14 || isCJKFont) {
            embedded = false;
        } else if (encoding.equals(IDENTITY_H) || encoding.equals(IDENTITY_V)) {
            embedded = true;
        }
        BaseFont fontFound = null;
        BaseFont fontBuilt = null;
        String key = name + "\n" + encoding + "\n" + embedded;
        if (cached) {
            fontFound = fontCache.get(key);
            if (fontFound != null) {
                return fontFound;
            }
        }
        if (isBuiltinFonts14 || name.toLowerCase().endsWith(".afm")
                || name.toLowerCase().endsWith(".pfm")) {
            fontBuilt = new Type1Font(name, encoding, embedded, ttfAfm, pfb,
                    forceRead);
            fontBuilt.fastWinansi = encoding.equals(CP1252);
        } else if (nameBase.toLowerCase().endsWith(".ttf")
                || nameBase.toLowerCase().endsWith(".otf")
                || nameBase.toLowerCase().indexOf(".ttc,") > 0) {
            if (encoding.equals(IDENTITY_H) || encoding.equals(IDENTITY_V)) {
                fontBuilt = new TrueTypeFontUnicode(name, encoding, embedded,
                        ttfAfm, forceRead);
                LayoutProcessor.loadFont(fontBuilt, name);
            } else {
                fontBuilt = new TrueTypeFont(name, encoding, embedded, ttfAfm,
                        false, forceRead);
                fontBuilt.fastWinansi = encoding.equals(CP1252);
            }
        } else if (isCJKFont) {
            fontBuilt = new CJKFont(name, encoding, embedded);
        } else if (noThrow) {
            return null;
        } else {
            throw new DocumentException(MessageLocalization.getComposedMessage(
                    "font.1.with.2.is.not.recognized", name, encoding));
        }
        if (cached) {
            fontCache.putIfAbsent(key, fontBuilt);
      return fontCache.get(key);
        }
        return fontBuilt;
    }

    /**
     * Creates a font based on an existing document font. The created font font
     * may not behave as expected, depending on the encoding or subset.
     * 
     * @param fontRef
     *            the reference to the document font
     * @return the font
     */
    public static BaseFont createFont(PRIndirectReference fontRef) {
        return new DocumentFont(fontRef);
    }

    /**
     * Gets the name without the modifiers Bold, Italic or BoldItalic.
     * 
     * @param name
     *            the full name of the font
     * @return the name without the modifiers Bold, Italic or BoldItalic
     */
    protected static String getBaseName(String name) {
        if (name.endsWith(",Bold")) {
            return name.substring(0, name.length() - 5);
        } else if (name.endsWith(",Italic")) {
            return name.substring(0, name.length() - 7);
        } else if (name.endsWith(",BoldItalic")) {
            return name.substring(0, name.length() - 11);
        } else {
            return name;
        }
    }

    /**
     * Normalize the encoding names. "winansi" is changed to "Cp1252" and
     * "macroman" is changed to "MacRoman".
     * 
     * @param enc
     *            the encoding to be normalized
     * @return the normalized encoding
     */
    protected static String normalizeEncoding(String enc) {
        if (enc.equals("winansi") || enc.equals("")) {
            return CP1252;
        } else if (enc.equals("macroman")) {
            return MACROMAN;
        } else {
            return enc;
        }
    }

    /**
     * Creates the widths and the differences arrays
     */
    protected void createEncoding() {
        if (encoding.startsWith("#")) {
            specialMap = new IntHashtable();
            StringTokenizer tok = new StringTokenizer(encoding.substring(1),
                    " ,\t\n\r\f");
            if (tok.nextToken().equals("full")) {
                while (tok.hasMoreTokens()) {
                    String order = tok.nextToken();
                    String name = tok.nextToken();
                    char uni = (char) Integer.parseInt(tok.nextToken(), 16);
                    int orderK;
                    if (order.startsWith("'")) {
                        orderK = order.charAt(1);
                    } else {
                        orderK = Integer.parseInt(order);
                    }
                    orderK %= 256;
                    specialMap.put(uni, orderK);
                    differences[orderK] = name;
                    unicodeDifferences[orderK] = uni;
                    widths[orderK] = getRawWidth(uni, name);
                    charBBoxes[orderK] = getRawCharBBox(uni, name);
                }
            } else {
                int k = 0;
                if (tok.hasMoreTokens()) {
                    k = Integer.parseInt(tok.nextToken());
                }
                while (tok.hasMoreTokens() && k < 256) {
                    String hex = tok.nextToken();
                    int uni = Integer.parseInt(hex, 16) % 0x10000;
                    String name = GlyphList.unicodeToName(uni);
                    if (name != null) {
                        specialMap.put(uni, k);
                        differences[k] = name;
                        unicodeDifferences[k] = (char) uni;
                        widths[k] = getRawWidth(uni, name);
                        charBBoxes[k] = getRawCharBBox(uni, name);
                        ++k;
                    }
                }
            }
            for (int k = 0; k < 256; ++k) {
                if (differences[k] == null) {
                    differences[k] = notdef;
                }
            }
        } else if (fontSpecific) {
            for (int k = 0; k < 256; ++k) {
                widths[k] = getRawWidth(k, null);
                charBBoxes[k] = getRawCharBBox(k, null);
            }
        } else {
            String s;
            String name;
            char c;
            byte[] b = new byte[1];
            for (int k = 0; k < 256; ++k) {
                b[0] = (byte) k;
                s = PdfEncodings.convertToString(b, encoding);
                if (s.length() > 0) {
                    c = s.charAt(0);
                } else {
                    c = '?';
                }
                name = GlyphList.unicodeToName(c);
                if (name == null) {
                    name = notdef;
                }
                differences[k] = name;
                unicodeDifferences[k] = c;
                widths[k] = getRawWidth(c, name);
                charBBoxes[k] = getRawCharBBox(c, name);
            }
        }
    }

    /**
     * Gets the width from the font according to the Unicode char c
     * or the name. If the name is null it's a
     * symbolic font.
     * 
     * @param c
     *            the unicode char
     * @param name
     *            the glyph name
     * @return the width of the char
     */
    abstract int getRawWidth(int c, String name);

    /**
     * Gets the kerning between two Unicode chars.
     * 
     * @param char1
     *            the first char
     * @param char2
     *            the second char
     * @return the kerning to be applied in normalized 1000 units
     */
    public abstract int getKerning(int char1, int char2);

    /**
     * Sets the kerning between two Unicode chars.
     * 
     * @param char1
     *            the first char
     * @param char2
     *            the second char
     * @param kern
     *            the kerning to apply in normalized 1000 units
     * @return true if the kerning was applied, false
     *         otherwise
     */
    public abstract boolean setKerning(int char1, int char2, int kern);

    /**
     * Gets the width of a char in normalized 1000 units.
     * 
     * @param char1
     *            the unicode char to get the width of
     * @return the width in normalized 1000 units
     */
    public int getWidth(int char1) {
        if (fastWinansi) {
            if (char1 < 128 || char1 >= 160 && char1 <= 255) {
                return widths[char1];
            } else {
                return widths[PdfEncodings.winansi.get(char1)];
            }
        } else {
            int total = 0;
            byte[] mbytes = convertToBytes((char) char1);
            for (byte mbyte : mbytes) {
                total += widths[0xff & mbyte];
            }
            return total;
        }
    }

    /**
     * Gets the width of a String in normalized 1000 units.
     * 
     * @param text
     *            the String to get the width of
     * @return the width in normalized 1000 units
     */
    public int getWidth(String text) {
        int total = 0;
        if (fastWinansi) {
            int len = text.length();
            for (int k = 0; k < len; ++k) {
                char char1 = text.charAt(k);
                if (char1 < 128 || char1 >= 160 && char1 <= 255) {
                    total += widths[char1];
                } else {
                    total += widths[PdfEncodings.winansi.get(char1)];
                }
            }
            return total;
        } else {
            byte[] mbytes = convertToBytes(text);
            for (byte mbyte : mbytes) {
                total += widths[0xff & mbyte];
            }
        }
        return total;
    }

    /**
     * Gets the descent of a String in normalized 1000 units. The
     * descent will always be less than or equal to zero even if all the
     * characters have an higher descent.
     * 
     * @param text
     *            the String to get the descent of
     * @return the descent in normalized 1000 units
     */
    public int getDescent(String text) {
        int min = 0;
        char[] chars = text.toCharArray();
        for (char c : chars) {
            int[] bbox = getCharBBox(c);
            if (bbox != null && bbox[1] < min) {
                min = bbox[1];
            }
        }
        return min;
    }

    /**
     * Gets the ascent of a String in normalized 1000 units. The
     * ascent will always be greater than or equal to zero even if all the
     * characters have a lower ascent.
     * 
     * @param text
     *            the String to get the ascent of
     * @return the ascent in normalized 1000 units
     */
    public int getAscent(String text) {
        int max = 0;
        char[] chars = text.toCharArray();
        for (char c : chars) {
            int[] bbox = getCharBBox(c);
            if (bbox != null && bbox[3] > max) {
                max = bbox[3];
            }
        }
        return max;
    }

    /**
     * Gets the descent of a String in points. The descent will
     * always be less than or equal to zero even if all the characters have an
     * higher descent.
     * 
     * @param text
     *            the String to get the descent of
     * @param fontSize
     *            the size of the font
     * @return the descent in points
     */
    public float getDescentPoint(String text, float fontSize) {
        return getDescent(text) * 0.001f * fontSize;
    }

    /**
     * Gets the ascent of a String in points. The ascent will
     * always be greater than or equal to zero even if all the characters have a
     * lower ascent.
     * 
     * @param text
     *            the String to get the ascent of
     * @param fontSize
     *            the size of the font
     * @return the ascent in points
     */
    public float getAscentPoint(String text, float fontSize) {
        return getAscent(text) * 0.001f * fontSize;
    }

    // ia>

    /**
     * Gets the width of a String in points taking kerning into
     * account.
     * 
     * @param text
     *            the String to get the width of
     * @param fontSize
     *            the font size
     * @return the width in points
     */
    public float getWidthPointKerned(String text, float fontSize) {
        float size = getWidth(text) * 0.001f * fontSize;
        if (!hasKernPairs()) {
            return size;
        }
        int len = text.length() - 1;
        int kern = 0;
        char[] c = text.toCharArray();
        for (int k = 0; k < len; ++k) {
            kern += getKerning(c[k], c[k + 1]);
        }
        return size + kern * 0.001f * fontSize;
    }

    /**
     * Gets the width of a String in points.
     * 
     * @param text
     *            the String to get the width of
     * @param fontSize
     *            the font size
     * @return the width in points
     */
    public float getWidthPoint(String text, float fontSize) {
        return getWidth(text) * 0.001f * fontSize;
    }

    /**
     * Gets the width of a char in points.
     * 
     * @param char1
     *            the char to get the width of
     * @param fontSize
     *            the font size
     * @return the width in points
     */
    public float getWidthPoint(int char1, float fontSize) {
        return getWidth(char1) * 0.001f * fontSize;
    }

    /**
     * Converts a String to a byte array according to
     * the font's encoding.
     * 
     * @param text
     *            the String to be converted
     * @return an array of byte representing the conversion
     *         according to the font's encoding
     */
    byte[] convertToBytes(String text) {
        if (directTextToByte) {
            return PdfEncodings.convertToBytes(text, null);
        }
        if (specialMap != null) {
            byte[] b = new byte[text.length()];
            int ptr = 0;
            int length = text.length();
            for (int k = 0; k < length; ++k) {
                char c = text.charAt(k);
                if (specialMap.containsKey(c)) {
                    b[ptr++] = (byte) specialMap.get(c);
                }
            }
            if (ptr < length) {
                byte[] b2 = new byte[ptr];
                System.arraycopy(b, 0, b2, 0, ptr);
                return b2;
            } else {
                return b;
            }
        }
        return PdfEncodings.convertToBytes(text, encoding);
    }

    /**
     * Converts a char to a byte array according to
     * the font's encoding.
     * 
     * @param char1
     *            the char to be converted
     * @return an array of byte representing the conversion
     *         according to the font's encoding
     */
    byte[] convertToBytes(int char1) {
        if (directTextToByte) {
            return PdfEncodings.convertToBytes((char) char1, null);
        }
        if (specialMap != null) {
            if (specialMap.containsKey(char1)) {
                return new byte[] { (byte) specialMap.get(char1) };
            } else {
                return new byte[0];
            }
        }
        return PdfEncodings.convertToBytes((char) char1, encoding);
    }

    /**
     * Outputs to the writer the font dictionaries and streams.
     * 
     * @param writer
     *            the writer for this document
     * @param ref
     *            the font indirect reference
     * @param params
     *            several parameters that depend on the font type
     * @throws IOException
     *             on error
     * @throws DocumentException
     *             error in generating the object
     */
    abstract void writeFont(PdfWriter writer, PdfIndirectReference ref,
                            Object[] params) throws DocumentException, IOException;

    /**
     * Returns a PdfStream object with the full font program (if possible). This
     * method will return null for some types of fonts (CJKFont, Type3Font) or
     * if there is no font program available (standard Type 1 fonts).
     * 
     * @return a PdfStream with the font program
     * @throws IOException on error
     * @throws DocumentException on error
     * @since 2.1.3
     */
    abstract PdfStream getFullFontStream() throws IOException,
            DocumentException;

    /**
     * Gets the encoding used to convert String into
     * byte[].
     * 
     * @return the encoding name
     */
    public String getEncoding() {
        return encoding;
    }

    /**
     * Gets the font parameter identified by key. Valid values for
     * key are ASCENT, AWT_ASCENT,
     * CAPHEIGHT, DESCENT, AWT_DESCENT,
     * ITALICANGLE, BBOXLLX, BBOXLLY,
     * BBOXURX and BBOXURY.
     * 
     * @param key
     *            the parameter to be extracted
     * @param fontSize
     *            the font size in points
     * @return the parameter in points
     */
    public abstract float getFontDescriptor(int key, float fontSize);

    /**
     * Gets the font type. The font types can be: FONT_TYPE_T1, FONT_TYPE_TT,
     * FONT_TYPE_CJK and FONT_TYPE_TTUNI.
     * 
     * @return the font type
     */
    public int getFontType() {
        return fontType;
    }

    /**
     * Gets the embedded flag.
     * 
     * @return true if the font is embedded.
     */
    public boolean isEmbedded() {
        return embedded;
    }

    /**
     * Gets the symbolic flag of the font.
     * 
     * @return true if the font is symbolic
     */
    public boolean isFontSpecific() {
        return fontSpecific;
    }

    /**
     * Creates a unique subset prefix to be added to the font name when the font
     * is embedded and subset.
     * 
     * @return the subset prefix
     */
    public static String createSubsetPrefix() {
        String s = "";
        for (int k = 0; k < 6; ++k) {
            s += (char) (Math.random() * 26 + 'A');
        }
        return s + "+";
    }

    /**
     * Gets the Unicode character corresponding to the byte output to the pdf
     * stream.
     * 
     * @param index
     *            the byte index
     * @return the Unicode character
     */
    char getUnicodeDifferences(int index) {
        return unicodeDifferences[index];
    }

    /**
     * Gets the postscript font name.
     * 
     * @return the postscript font name
     */
    public abstract String getPostscriptFontName();

    /**
     * Sets the font name that will appear in the pdf font dictionary. Use with
     * care as it can easily make a font unreadable if not embedded.
     * 
     * @param name
     *            the new font name
     */
    public abstract void setPostscriptFontName(String name);

    /**
     * Gets the full name of the font. If it is a True Type font each array
     * element will have {Platform ID, Platform Encoding ID, Language ID, font
     * name}. The interpretation of this values can be found in the Open Type
     * specification, chapter 2, in the 'name' table.

     * For the other fonts the array has a single element with {"", "", "", font
     * name}.
     * 
     * @return the full name of the font
     */
    public abstract String[][] getFullFontName();

    /**
     * Gets all the entries of the names-table. If it is a True Type font each
     * array element will have {Name ID, Platform ID, Platform Encoding ID,
     * Language ID, font name}. The interpretation of this values can be found
     * in the Open Type specification, chapter 2, in the 'name' table.

     * For the other fonts the array has a single element with {"4", "", "", "",
     * font name}.
     * 
     * @return the full name of the font
     * @since 2.0.8
     */
    public abstract String[][] getAllNameEntries();

    /**
     * Gets the full name of the font. If it is a True Type font each array
     * element will have {Platform ID, Platform Encoding ID, Language ID, font
     * name}. The interpretation of this values can be found in the Open Type
     * specification, chapter 2, in the 'name' table.

     * For the other fonts the array has a single element with {"", "", "", font
     * name}.
     * 
     * @param name
     *            the name of the font
     * @param encoding
     *            the encoding of the font
     * @param ttfAfm
     *            the true type font or the afm in a byte array
     * @throws DocumentException
     *             on error
     * @throws IOException
     *             on error
     * @return the full name of the font
     */
    public static String[][] getFullFontName(String name, String encoding,
                                             byte[] ttfAfm) throws DocumentException, IOException {
        String nameBase = getBaseName(name);
        BaseFont fontBuilt = null;
        if (nameBase.toLowerCase().endsWith(".ttf")
                || nameBase.toLowerCase().endsWith(".otf")
                || nameBase.toLowerCase().indexOf(".ttc,") > 0) {
            fontBuilt = new TrueTypeFont(name, CP1252, false, ttfAfm, true,
                    false);
        } else {
            fontBuilt = createFont(name, encoding, false, false, ttfAfm, null);
        }
        return fontBuilt.getFullFontName();
    }

    /**
     * Gets all the names from the font. Only the required tables are read.
     * 
     * @param name
     *            the name of the font
     * @param encoding
     *            the encoding of the font
     * @param ttfAfm
     *            the true type font or the afm in a byte array
     * @throws DocumentException
     *             on error
     * @throws IOException
     *             on error
     * @return an array of Object[] built with {getPostscriptFontName(),
     *         getFamilyFontName(), getFullFontName()}
     */
    public static Object[] getAllFontNames(String name, String encoding,
                                           byte[] ttfAfm) throws DocumentException, IOException {
        String nameBase = getBaseName(name);
        BaseFont fontBuilt = null;
        if (nameBase.toLowerCase().endsWith(".ttf")
                || nameBase.toLowerCase().endsWith(".otf")
                || nameBase.toLowerCase().indexOf(".ttc,") > 0) {
            fontBuilt = new TrueTypeFont(name, CP1252, false, ttfAfm, true,
                    false);
        } else {
            fontBuilt = createFont(name, encoding, false, false, ttfAfm, null);
        }
        return new Object[] { fontBuilt.getPostscriptFontName(),
                fontBuilt.getFamilyFontName(), fontBuilt.getFullFontName() };
    }

    /**
     * Gets all the entries of the namestable from the font. Only the required
     * tables are read.
     * 
     * @param name
     *            the name of the font
     * @param encoding
     *            the encoding of the font
     * @param ttfAfm
     *            the true type font or the afm in a byte array
     * @throws DocumentException
     *             on error
     * @throws IOException
     *             on error
     * @return an array of Object[] built with {getPostscriptFontName(),
     *         getFamilyFontName(), getFullFontName()}
     * @since 2.0.8
     */
    public static String[][] getAllNameEntries(String name, String encoding,
                                               byte[] ttfAfm) throws DocumentException, IOException {
        String nameBase = getBaseName(name);
        BaseFont fontBuilt = null;
        if (nameBase.toLowerCase().endsWith(".ttf")
                || nameBase.toLowerCase().endsWith(".otf")
                || nameBase.toLowerCase().indexOf(".ttc,") > 0) {
            fontBuilt = new TrueTypeFont(name, CP1252, false, ttfAfm, true,
                    false);
        } else {
            fontBuilt = createFont(name, encoding, false, false, ttfAfm, null);
        }
        return fontBuilt.getAllNameEntries();
    }

    /**
     * Gets the family name of the font. If it is a True Type font each array
     * element will have {Platform ID, Platform Encoding ID, Language ID, font
     * name}. The interpretation of this values can be found in the Open Type
     * specification, chapter 2, in the 'name' table.

     * For the other fonts the array has a single element with {"", "", "", font
     * name}.
     * 
     * @return the family name of the font
     */
    public abstract String[][] getFamilyFontName();

    /**
     * Gets the code pages supported by the font. This has only meaning with
     * True Type fonts.
     * 
     * @return the code pages supported by the font
     */
    public String[] getCodePagesSupported() {
        return new String[0];
    }

    /**
     * Enumerates the postscript font names present inside a True Type
     * Collection.
     * 
     * @param ttcFile
     *            the file name of the font
     * @throws DocumentException
     *             on error
     * @throws IOException
     *             on error
     * @return the postscript font names
     */
    public static String[] enumerateTTCNames(String ttcFile)
            throws DocumentException, IOException {
        return new EnumerateTTC(ttcFile).getNames();
    }

    /**
     * Enumerates the postscript font names present inside a True Type
     * Collection.
     * 
     * @param ttcArray
     *            the font as a byte array
     * @throws DocumentException
     *             on error
     * @throws IOException
     *             on error
     * @return the postscript font names
     */
    public static String[] enumerateTTCNames(byte[] ttcArray)
            throws DocumentException, IOException {
        return new EnumerateTTC(ttcArray).getNames();
    }

    /**
     * Gets the font width array.
     * 
     * @return the font width array
     */
    public int[] getWidths() {
        return widths;
    }

    /**
     * Gets the array with the names of the characters.
     * 
     * @return the array with the names of the characters
     */
    public String[] getDifferences() {
        return differences;
    }

    /**
     * Gets the array with the unicode characters.
     * 
     * @return the array with the unicode characters
     */
    public char[] getUnicodeDifferences() {
        return unicodeDifferences;
    }

    /**
     * Gets the state of the property.
     * 
     * @return value of property forceWidthsOutput
     */
    public boolean isForceWidthsOutput() {
        return forceWidthsOutput;
    }

    /**
     * Set to true to force the generation of the widths array.
     * 
     * @param forceWidthsOutput
     *            true to force the generation of the widths array
     */
    public void setForceWidthsOutput(boolean forceWidthsOutput) {
        this.forceWidthsOutput = forceWidthsOutput;
    }

    /**
     * Gets the direct conversion of char to byte.
     * 
     * @return value of property directTextToByte.
     * @see #setDirectTextToByte(boolean directTextToByte)
     */
    public boolean isDirectTextToByte() {
        return directTextToByte;
    }

    /**
     * Sets the conversion of char directly to byte by
     * casting. This is a low level feature to put the bytes directly in the
     * content stream without passing through String.getBytes().
     * 
     * @param directTextToByte
     *            New value of property directTextToByte.
     */
    public void setDirectTextToByte(boolean directTextToByte) {
        this.directTextToByte = directTextToByte;
    }

    /**
     * Indicates if all the glyphs and widths for that particular encoding
     * should be included in the document.
     * 
     * @return false to include all the glyphs and widths.
     */
    public boolean isSubset() {
        return subset;
    }

    /**
     * Indicates if all the glyphs and widths for that particular encoding
     * should be included in the document. When set to true only
     * the glyphs used will be included in the font. When set to
     * false and {@link #addSubsetRange(int[])} was not called the
     * full font will be included otherwise just the characters ranges will be
     * included.
     * 
     * @param subset
     *            new value of property subset
     */
    public void setSubset(boolean subset) {
        this.subset = subset;
    }

    /**
     * Gets the font resources.
     * 
     * @param key
     *            the full name of the resource
     * @return the InputStream to get the resource or
     *         null if not found
     */
    public static InputStream getResourceStream(String key) {
        return getResourceStream(key, null);
    }

    /**
     * Gets the font resources.
     * 
     * @param key
     *            the full name of the resource
     * @param loader
     *            the ClassLoader to load the resource or null to try the ones
     *            available
     * @return the InputStream to get the resource or
     *         null if not found
     */
    public static InputStream getResourceStream(String key, ClassLoader loader) {
        if (key.startsWith("/")) {
            key = key.substring(1);
        }
        InputStream is = null;
        if (loader != null) {
            is = loader.getResourceAsStream(key);
            if (is != null) {
                return is;
            }
        }
        // Try to use Context Class Loader to load the properties file.
        try {
            ClassLoader contextClassLoader = Thread.currentThread()
                    .getContextClassLoader();
            if (contextClassLoader != null) {
                is = contextClassLoader.getResourceAsStream(key);
            }
        } catch (Throwable e) {
        }

        if (is == null) {
            is = BaseFont.class.getResourceAsStream("/" + key);
        }
        if (is == null) {
            is = ClassLoader.getSystemResourceAsStream(key);
        }
        return is;
    }

    /**
     * Gets the Unicode equivalent to a CID. The (nonexistent) CID FF00 is
     * translated as '\n'. It has only meaning with CJK fonts with Identity
     * encoding.
     *
     * @param c the CID code
     * @return the Unicode equivalent
     */
    public int getUnicodeEquivalent(int c) {
        return c;
    }

    /**
     * Gets the CID code given an Unicode. It has only meaning with CJK fonts.
     * 
     * @param c
     *            the Unicode
     * @return the CID equivalent
     */
    public int getCidCode(int c) {
        return c;
    }

    /**
     * Checks if the font has any kerning pairs.
     * 
     * @return true if the font has any kerning pairs
     */
    public abstract boolean hasKernPairs();

    /**
     * Checks if a character exists in this font.
     * 
     * @param c
     *            the character to check
     * @return true if the character has a glyph,
     *         false otherwise
     */
    public boolean charExists(int c) {
        byte[] b = convertToBytes(c);
        return b.length > 0;
    }

    /**
     * Sets the character advance.
     * 
     * @param c
     *            the character
     * @param advance
     *            the character advance normalized to 1000 units
     * @return true if the advance was set, false
     *         otherwise
     */
    public boolean setCharAdvance(int c, int advance) {
        byte[] b = convertToBytes(c);
        if (b.length == 0) {
            return false;
        }
        widths[0xff & b[0]] = advance;
        return true;
    }

    private static void addFont(PRIndirectReference fontRef, IntHashtable hits,
            ArrayList fonts) {
        PdfObject obj = PdfReader.getPdfObject(fontRef);
        if (obj == null || !obj.isDictionary()) {
            return;
        }
        PdfDictionary font = (PdfDictionary) obj;
        PdfName subtype = font.getAsName(PdfName.SUBTYPE);
        if (!PdfName.TYPE1.equals(subtype) && !PdfName.TRUETYPE.equals(subtype)) {
            return;
        }
        PdfName name = font.getAsName(PdfName.BASEFONT);
        fonts.add(new Object[] { PdfName.decodeName(name.toString()), fontRef });
        hits.put(fontRef.getNumber(), 1);
    }

    private static void recourseFonts(PdfDictionary page, IntHashtable hits,
            ArrayList fonts, int level) {
        ++level;
        if (level > 50) {
            return;
        }
        PdfDictionary resources = page.getAsDict(PdfName.RESOURCES);
        if (resources == null) {
            return;
        }
        PdfDictionary font = resources.getAsDict(PdfName.FONT);
        if (font != null) {
            for (PdfName pdfName : font.getKeys()) {
                PdfObject ft = font.get(pdfName);
                if (ft == null || !ft.isIndirect()) {
                    continue;
                }
                int hit = ((PRIndirectReference) ft).getNumber();
                if (hits.containsKey(hit)) {
                    continue;
                }
                addFont((PRIndirectReference) ft, hits, fonts);
            }
        }
        PdfDictionary xobj = resources.getAsDict(PdfName.XOBJECT);
        if (xobj != null) {
            for (PdfName pdfName : xobj.getKeys()) {
                recourseFonts(xobj.getAsDict(pdfName), hits, fonts,
                        level);
            }
        }
    }

    /**
     * Gets a list of all document fonts. Each element of the
     * ArrayList contains a
     * Object[]{String,PRIndirectReference} with the font name and
     * the indirect reference to it.
     * 
     * @param reader
     *            the document where the fonts are to be listed from
     * @return the list of fonts and references
     */
    public static ArrayList getDocumentFonts(PdfReader reader) {
        IntHashtable hits = new IntHashtable();
        ArrayList fonts = new ArrayList<>();
        int npages = reader.getNumberOfPages();
        for (int k = 1; k <= npages; ++k) {
            recourseFonts(reader.getPageN(k), hits, fonts, 1);
        }
        return fonts;
    }

    /**
     * Gets a list of the document fonts in a particular page. Each element of
     * the ArrayList contains a
     * Object[]{String,PRIndirectReference} with the font name and
     * the indirect reference to it.
     * 
     * @param reader
     *            the document where the fonts are to be listed from
     * @param page
     *            the page to list the fonts from
     * @return the list of fonts and references
     */
    public static ArrayList getDocumentFonts(PdfReader reader,
            int page) {
        IntHashtable hits = new IntHashtable();
        ArrayList fonts = new ArrayList<>();
        recourseFonts(reader.getPageN(page), hits, fonts, 1);
        return fonts;
    }

    /**
     * Gets the smallest box enclosing the character contours. It will return
     * null if the font has not the information or the character
     * has no contours, as in the case of the space, for example. Characters
     * with no contours may also return [0,0,0,0].
     * 
     * @param c
     *            the character to get the contour bounding box from
     * @return an array of four floats with the bounding box in the format
     *         [llx,lly,urx,ury] or null
     */
    public int[] getCharBBox(int c) {
        byte[] b = convertToBytes(c);
        if (b.length == 0) {
            return null;
        } else {
            return charBBoxes[b[0] & 0xff];
        }
    }

    protected abstract int[] getRawCharBBox(int c, String name);

    /**
     * iText expects Arabic Diactrics (tashkeel) to have zero advance but some
     * fonts, most notably those that come with Windows, like times.ttf, have
     * non-zero advance for those characters. This method makes those character
     * to have zero width advance and work correctly in the iText Arabic shaping
     * and reordering context.
     */
    public void correctArabicAdvance() {
        for (char c = '\u064b'; c <= '\u0658'; ++c) {
            setCharAdvance(c, 0);
        }
        setCharAdvance('\u0670', 0);
        for (char c = '\u06d6'; c <= '\u06dc'; ++c) {
            setCharAdvance(c, 0);
        }
        for (char c = '\u06df'; c <= '\u06e4'; ++c) {
            setCharAdvance(c, 0);
        }
        for (char c = '\u06e7'; c <= '\u06e8'; ++c) {
            setCharAdvance(c, 0);
        }
        for (char c = '\u06ea'; c <= '\u06ed'; ++c) {
            setCharAdvance(c, 0);
        }
    }

    /**
     * Adds a character range when subsetting. The range is an int
     * array where the first element is the start range inclusive and the second
     * element is the end range inclusive. Several ranges are allowed in the
     * same array.
     * 
     * @param range
     *            the character range
     */
    public void addSubsetRange(int[] range) {
        if (subsetRanges == null) {
            subsetRanges = new ArrayList<>();
        }
        subsetRanges.add(range);
    }

    /**
     * Returns the compression level used for the font streams.
     * 
     * @return the compression level (0 = best speed, 9 = best compression, -1
     *         is default)
     * @since 2.1.3
     */
    public int getCompressionLevel() {
        return compressionLevel;
    }

    /**
     * Sets the compression level to be used for the font streams.
     * 
     * @param compressionLevel
     *            a value between 0 (best speed) and 9 (best compression)
     * @since 2.1.3
     */
    public void setCompressionLevel(int compressionLevel) {
        if (compressionLevel < PdfStream.NO_COMPRESSION
                || compressionLevel > PdfStream.BEST_COMPRESSION) {
            this.compressionLevel = PdfStream.DEFAULT_COMPRESSION;
        } else {
            this.compressionLevel = compressionLevel;
        }
    }
}