using System;
using iTextSharp.text;
/*
 * $Id: Barcode39.cs,v 1.5 2006/09/17 15:58:51 psoares33 Exp $
 *
 * Copyright 2002-2006 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
namespace iTextSharp.text.pdf {
    /** Implements the code 39 and code 39 extended. The default parameters are:
     * <pre>
     *x = 0.8f;
     *n = 2;
     *font = BaseFont.CreateFont("Helvetica", "winansi", false);
     *size = 8;
     *baseline = size;
     *barHeight = size * 3;
     *textint= Element.ALIGN_CENTER;
     *generateChecksum = false;
     *checksumText = false;
     *startStopText = true;
     *extended = false;
     * </pre>
     *
     * @author Paulo Soares (psoares@consiste.pt)
     */
    public class Barcode39 : Barcode {
        /** The bars to generate the code.
        */    
        private static readonly byte[][] BARS = 
        {
            new byte[] {0,0,0,1,1,0,1,0,0},
            new byte[] {1,0,0,1,0,0,0,0,1},
            new byte[] {0,0,1,1,0,0,0,0,1},
            new byte[] {1,0,1,1,0,0,0,0,0},
            new byte[] {0,0,0,1,1,0,0,0,1},
            new byte[] {1,0,0,1,1,0,0,0,0},
            new byte[] {0,0,1,1,1,0,0,0,0},
            new byte[] {0,0,0,1,0,0,1,0,1},
            new byte[] {1,0,0,1,0,0,1,0,0},
            new byte[] {0,0,1,1,0,0,1,0,0},
            new byte[] {1,0,0,0,0,1,0,0,1},
            new byte[] {0,0,1,0,0,1,0,0,1},
            new byte[] {1,0,1,0,0,1,0,0,0},
            new byte[] {0,0,0,0,1,1,0,0,1},
            new byte[] {1,0,0,0,1,1,0,0,0},
            new byte[] {0,0,1,0,1,1,0,0,0},
            new byte[] {0,0,0,0,0,1,1,0,1},
            new byte[] {1,0,0,0,0,1,1,0,0},
            new byte[] {0,0,1,0,0,1,1,0,0},
            new byte[] {0,0,0,0,1,1,1,0,0},
            new byte[] {1,0,0,0,0,0,0,1,1},
            new byte[] {0,0,1,0,0,0,0,1,1},
            new byte[] {1,0,1,0,0,0,0,1,0},
            new byte[] {0,0,0,0,1,0,0,1,1},
            new byte[] {1,0,0,0,1,0,0,1,0},
            new byte[] {0,0,1,0,1,0,0,1,0},
            new byte[] {0,0,0,0,0,0,1,1,1},
            new byte[] {1,0,0,0,0,0,1,1,0},
            new byte[] {0,0,1,0,0,0,1,1,0},
            new byte[] {0,0,0,0,1,0,1,1,0},
            new byte[] {1,1,0,0,0,0,0,0,1},
            new byte[] {0,1,1,0,0,0,0,0,1},
            new byte[] {1,1,1,0,0,0,0,0,0},
            new byte[] {0,1,0,0,1,0,0,0,1},
            new byte[] {1,1,0,0,1,0,0,0,0},
            new byte[] {0,1,1,0,1,0,0,0,0},
            new byte[] {0,1,0,0,0,0,1,0,1},
            new byte[] {1,1,0,0,0,0,1,0,0},
            new byte[] {0,1,1,0,0,0,1,0,0},
            new byte[] {0,1,0,1,0,1,0,0,0},
            new byte[] {0,1,0,1,0,0,0,1,0},
            new byte[] {0,1,0,0,0,1,0,1,0},
            new byte[] {0,0,0,1,0,1,0,1,0},
            new byte[] {0,1,0,0,1,0,1,0,0}
        };
     
        /** The index chars to <CODE>BARS</CODE>.
        */    
        private const string CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*";
        
        /** The character combinations to make the code 39 extended.
        */    
        private const string EXTENDED = "%U" +
            "$A$B$C$D$E$F$G$H$I$J$K$L$M$N$O$P$Q$R$S$T$U$V$W$X$Y$Z" +
            "%A%B%C%D%E  /A/B/C/D/E/F/G/H/I/J/K/L - ./O" +
            " 0 1 2 3 4 5 6 7 8 9/Z%F%G%H%I%J%V" +
            " A B C D E F G H I J K L M N O P Q R S T U V W X Y Z" +
            "%K%L%M%N%O%W" +
            "+A+B+C+D+E+F+G+H+I+J+K+L+M+N+O+P+Q+R+S+T+U+V+W+X+Y+Z" +
            "%P%Q%R%S%T";
            
        /** Creates a new Barcode39.
        */    
        public Barcode39() {
            x = 0.8f;
            n = 2;
            font = BaseFont.CreateFont("Helvetica", "winansi", false);
            size = 8;
            baseline = size;
            barHeight = size * 3;
            textAlignment = Element.ALIGN_CENTER;
            generateChecksum = false;
            checksumText = false;
            startStopText = true;
            extended = false;
        }
        
        /** Creates the bars.
        * @param text the text to create the bars. This text does not include the start and
        * stop characters
        * @return the bars
        */    
        public static byte[] GetBarsCode39(string text) {
            text = "*" + text + "*";
            byte[] bars = new byte[text.Length * 10 - 1];
            for (int k = 0; k < text.Length; ++k) {
                int idx = CHARS.IndexOf(text[k]);
                if (idx < 0)
                    throw new ArgumentException("The character '" + text[k] + "' is illegal in code 39.");
                Array.Copy(BARS[idx], 0, bars, k * 10, 9);
            }
            return bars;
        }
        
        /** Converts the extended text into a normal, escaped text,
        * ready to generate bars.
        * @param text the extended text
        * @return the escaped text
        */    
        public static string GetCode39Ex(string text) {
            string ret = "";
            for (int k = 0; k < text.Length; ++k) {
                char c = text[k];
                if (c > 127)
                    throw new ArgumentException("The character '" + c + "' is illegal in code 39 extended.");
                char c1 = EXTENDED[c * 2];
                char c2 = EXTENDED[c * 2 + 1];
                if (c1 != ' ')
                    ret += c1;
                ret += c2;
            }
            return ret;
        }
        
        /** Calculates the checksum.
        * @param text the text
        * @return the checksum
        */    
        internal static char GetChecksum(string text) {
            int chk = 0;
            for (int k = 0; k < text.Length; ++k) {
                int idx = CHARS.IndexOf(text[k]);
                if (idx < 0)
                    throw new ArgumentException("The character '" + text[k] + "' is illegal in code 39.");
                chk += idx;
            }
            return CHARS[chk % 43];
        }
        
        /** Gets the maximum area that the barcode and the text, if
        * any, will occupy. The lower left corner is always (0, 0).
        * @return the size the barcode occupies.
        */    
        public override Rectangle BarcodeSize {
            get {
                float fontX = 0;
                float fontY = 0;
                if (font != null) {
                    if (baseline > 0)
                        fontY = baseline - font.GetFontDescriptor(BaseFont.DESCENT, size);
                    else
                        fontY = -baseline + size;
                    string fullCode = code;
                    if (generateChecksum && checksumText)
                        fullCode += GetChecksum(fullCode);
                    if (startStopText)
                        fullCode = "*" + fullCode + "*";
                    fontX = font.GetWidthPoint(altText != null ? altText : fullCode, size);
                }            
                string fCode = code;
                if (extended)
                    fCode = GetCode39Ex(code);


Answer:                 int len = fCode.Length + 2;