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Devin Jankowski
2023-06-21 12:46:23 -04:00
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iTechSharp/iTextSharp/text/html/HtmlEncoder.cs Normal file
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using System;
using System.Text;
using System.Drawing;
using iTextSharp.text;
/*
* $Id: HtmlEncoder.cs,v 1.6 2008/05/13 11:25:15 psoares33 Exp $
*
*
* Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
*
* 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.html {
/**
* This class converts a <CODE>String</CODE> to the HTML-format of a String.
* <P>
* To convert the <CODE>String</CODE>, each character is examined:
* <UL>
* <LI>ASCII-characters from 000 till 031 are represented as &amp;#xxx;<BR>
* (with xxx = the value of the character)
* <LI>ASCII-characters from 032 t/m 127 are represented by the character itself, except for:
* <UL>
* <LI>'\n' becomes &lt;BR&gt;\n
* <LI>&quot; becomes &amp;quot;
* <LI>&amp; becomes &amp;amp;
* <LI>&lt; becomes &amp;lt;
* <LI>&gt; becomes &amp;gt;
* </UL>
* <LI>ASCII-characters from 128 till 255 are represented as &amp;#xxx;<BR>
* (with xxx = the value of the character)
* </UL>
* <P>
* Example:
* <P><BLOCKQUOTE><PRE>
* String htmlPresentation = HtmlEncoder.Encode("Marie-Th&#233;r&#232;se S&#248;rensen");
* </PRE></BLOCKQUOTE><P>
* for more info: see O'Reilly; "HTML: The Definitive Guide" (page 164)
*
* @author mario.maccarini@rug.ac.be
*/
public sealed class HtmlEncoder {
// membervariables
/** List with the HTML translation of all the characters. */
private static String[] htmlCode = new String[256];
static HtmlEncoder() {
for (int i = 0; i < 10; i++) {
htmlCode[i] = "&#00" + i + ";";
}
for (int i = 10; i < 32; i++) {
htmlCode[i] = "&#0" + i + ";";
}
for (int i = 32; i < 128; i++) {
htmlCode[i] = ((char)i).ToString();
}
// Special characters
htmlCode['\t'] = "\t";
htmlCode['\n'] = "<" + HtmlTags.NEWLINE + " />\n";
htmlCode['\"'] = "&quot;"; // double quote
htmlCode['&'] = "&amp;"; // ampersand
htmlCode['<'] = "&lt;"; // lower than
htmlCode['>'] = "&gt;"; // greater than
for (int i = 128; i < 256; i++) {
htmlCode[i] = "&#" + i + ";";
}
}
// constructors
/**
* This class will never be constructed.
* <P>
* HtmlEncoder only contains static methods.
*/
private HtmlEncoder () { }
// methods
/**
* Converts a <CODE>String</CODE> to the HTML-format of this <CODE>String</CODE>.
*
* @param string The <CODE>String</CODE> to convert
* @return a <CODE>String</CODE>
*/
public static String Encode(String str) {
int n = str.Length;
char character;
StringBuilder buffer = new StringBuilder();
// loop over all the characters of the String.
for (int i = 0; i < n; i++) {
character = str[i];
// the Htmlcode of these characters are added to a StringBuilder one by one
if (character < 256) {
buffer.Append(htmlCode[character]);
}
else {
// Improvement posted by Joachim Eyrich
buffer.Append("&#").Append((int)character).Append(';');
}
}
return buffer.ToString();
}
/**
* Converts a <CODE>Color</CODE> into a HTML representation of this <CODE>Color</CODE>.
*
* @param color the <CODE>Color</CODE> that has to be converted.
* @return the HTML representation of this <COLOR>Color</COLOR>
*/
public static String Encode(Color color) {
StringBuilder buffer = new StringBuilder("#");
if (color.R < 16) {
buffer.Append('0');
}
buffer.Append(System.Convert.ToString(color.R, 16));
if (color.G < 16) {
buffer.Append('0');
}
buffer.Append(System.Convert.ToString(color.G, 16));
if (color.B < 16) {
buffer.Append('0');
}
buffer.Append(System.Convert.ToString(color.B, 16));
return buffer.ToString();
}
/**
* Translates the alignment value.
*
* @param alignment the alignment value
* @return the translated value
*/
public static String GetAlignment(int alignment) {
switch (alignment) {
case Element.ALIGN_LEFT:
return HtmlTags.ALIGN_LEFT;
case Element.ALIGN_CENTER:
return HtmlTags.ALIGN_CENTER;
case Element.ALIGN_RIGHT:
return HtmlTags.ALIGN_RIGHT;
case Element.ALIGN_JUSTIFIED:
case Element.ALIGN_JUSTIFIED_ALL:
return HtmlTags.ALIGN_JUSTIFIED;
case Element.ALIGN_TOP:
return HtmlTags.ALIGN_TOP;
case Element.ALIGN_MIDDLE:
return HtmlTags.ALIGN_MIDDLE;
case Element.ALIGN_BOTTOM:
return HtmlTags.ALIGN_BOTTOM;
case Element.ALIGN_BASELINE:
return HtmlTags.ALIGN_BASELINE;
default:
return "";
}
}
}
}