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NullHtmlEncoder.cs
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NullHtmlEncoder.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.IO;
using System.Text.Encodings.Web;
namespace Microsoft.AspNetCore.Razor.TagHelpers
{
/// <summary>
/// A <see cref="HtmlEncoder"/> that does not encode. Should not be used when writing directly to a response
/// expected to contain valid HTML.
/// </summary>
public class NullHtmlEncoder : HtmlEncoder
{
/// <summary>
/// Initializes a <see cref="NullHtmlEncoder"/> instance.
/// </summary>
protected NullHtmlEncoder()
{
}
/// <summary>
/// A <see cref="HtmlEncoder"/> instance that does not encode. Should not be used when writing directly to a
/// response expected to contain valid HTML.
/// </summary>
public static new NullHtmlEncoder Default { get; } = new NullHtmlEncoder();
/// <inheritdoc />
public override int MaxOutputCharactersPerInputCharacter
{
get
{
return 1;
}
}
/// <inheritdoc />
public override string Encode(string value)
{
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
return value;
}
/// <inheritdoc />
public override void Encode(TextWriter output, char[] value, int startIndex, int characterCount)
{
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (characterCount == 0)
{
return;
}
output.Write(value, startIndex, characterCount);
}
/// <inheritdoc />
public override void Encode(TextWriter output, string value, int startIndex, int characterCount)
{
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (characterCount == 0)
{
return;
}
output.Write(value.Substring(startIndex, characterCount));
}
/// <inheritdoc />
public override unsafe int FindFirstCharacterToEncode(char* text, int textLength)
{
return -1;
}
/// <inheritdoc />
public override unsafe bool TryEncodeUnicodeScalar(
int unicodeScalar,
char* buffer,
int bufferLength,
out int numberOfCharactersWritten)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
numberOfCharactersWritten = 0;
return false;
}
/// <inheritdoc />
public override bool WillEncode(int unicodeScalar)
{
return false;
}
}
}