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Use HttpUtility.HtmlDecode for decoding html #14

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Merged
mstancombe merged 1 commit into from
Jul 31, 2024
Merged

Use HttpUtility.HtmlDecode for decoding html #14

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72 changes: 2 additions & 70 deletions Source/HtmlRenderer/Core/Utils/HtmlUtils.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@

using System;
using System.Collections.Generic;
using System.Web;

namespace TheArtOfDev.HtmlRenderer.Core.Utils
{
Expand Down Expand Up @@ -319,14 +320,7 @@ public static string DecodeHtml(string str)
{
if (!string.IsNullOrEmpty(str))
{
str = DecodeHtmlCharByCode(str);

str = DecodeHtmlCharByName(str);

foreach (var encPair in _encodeDecode)
{
str = str.Replace(encPair.Key, encPair.Value);
}
str = HttpUtility.HtmlDecode(str);
}
return str;
}
Expand All @@ -348,67 +342,5 @@ public static string EncodeHtml(string str)
}
return str;
}


#region Private methods

/// <summary>
/// Decode html special charecters encoded using char entity code (&#8364;)
/// </summary>
/// <param name="str">the string to decode</param>
/// <returns>decoded string</returns>
private static string DecodeHtmlCharByCode(string str)
{
var idx = str.IndexOf("&#", StringComparison.OrdinalIgnoreCase);
while (idx > -1)
{
bool hex = str.Length > idx + 3 && char.ToLower(str[idx + 2]) == 'x';
var endIdx = idx + 2 + (hex ? 1 : 0);

long num = 0;
while (endIdx < str.Length && CommonUtils.IsDigit(str[endIdx], hex))
num = num * (hex ? 16 : 10) + CommonUtils.ToDigit(str[endIdx++], hex);
endIdx += (endIdx < str.Length && str[endIdx] == ';') ? 1 : 0;

string repl = string.Empty;
if (num >= 0 && num <= 0x10ffff && !(num >= 0xd800 && num <= 0xdfff))
repl = Char.ConvertFromUtf32((int)num);

str = str.Remove(idx, endIdx - idx);
str = str.Insert(idx, repl);

idx = str.IndexOf("&#", idx + 1);
}
return str;
}

/// <summary>
/// Decode html special charecters encoded using char entity name (&#euro;)
/// </summary>
/// <param name="str">the string to decode</param>
/// <returns>decoded string</returns>
private static string DecodeHtmlCharByName(string str)
{
var idx = str.IndexOf('&');
while (idx > -1)
{
var endIdx = str.IndexOf(';', idx);
if (endIdx > -1 && endIdx - idx < 8)
{
var key = str.Substring(idx + 1, endIdx - idx - 1);
char c;
if (_decodeOnly.TryGetValue(key, out c))
{
str = str.Remove(idx, endIdx - idx + 1);
str = str.Insert(idx, c.ToString());
}
}

idx = str.IndexOf('&', idx + 1);
}
return str;
}

#endregion
}
}