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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
namespace System.Text
{
using System;
using System.Collections;
using System.Collections.Generic;
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class EncodingProvider
{
public EncodingProvider() { }
public abstract Encoding GetEncoding(string name);
public abstract Encoding GetEncoding(int codepage);
// GetEncoding should return either valid encoding or null. shouldn't throw any exception except on null name
public virtual Encoding GetEncoding(string name, EncoderFallback encoderFallback, DecoderFallback decoderFallback)
{
Encoding enc = GetEncoding(name);
if (enc != null)
{
enc = (Encoding)GetEncoding(name).Clone();
enc.EncoderFallback = encoderFallback;
enc.DecoderFallback = decoderFallback;
}
return enc;
}
public virtual Encoding GetEncoding(int codepage, EncoderFallback encoderFallback, DecoderFallback decoderFallback)
{
Encoding enc = GetEncoding(codepage);
if (enc != null)
{
enc = (Encoding)GetEncoding(codepage).Clone();
enc.EncoderFallback = encoderFallback;
enc.DecoderFallback = decoderFallback;
}
return enc;
}
internal static void AddProvider(EncodingProvider provider)
{
if (provider == null)
throw new ArgumentNullException("provider");
lock (s_InternalSyncObject)
{
if (s_providers == null)
{
s_providers = new EncodingProvider[1] { provider };
return;
}
if (Array.IndexOf(s_providers, provider) >= 0)
{
return;
}
var providers = new EncodingProvider[s_providers.Length + 1];
Array.Copy(s_providers, providers, s_providers.Length);
providers[providers.Length - 1] = provider;
s_providers = providers;
}
}
internal static Encoding GetEncodingFromProvider(int codepage)
{
if (s_providers == null)
return null;
var providers = s_providers;
foreach (EncodingProvider provider in providers)
{
Encoding enc = provider.GetEncoding(codepage);
if (enc != null)
return enc;
}
return null;
}
internal static Encoding GetEncodingFromProvider(string encodingName)
{
if (s_providers == null)
return null;
var providers = s_providers;
foreach (EncodingProvider provider in providers)
{
Encoding enc = provider.GetEncoding(encodingName);
if (enc != null)
return enc;
}
return null;
}
internal static Encoding GetEncodingFromProvider(int codepage, EncoderFallback enc, DecoderFallback dec)
{
if (s_providers == null)
return null;
var providers = s_providers;
foreach (EncodingProvider provider in providers)
{
Encoding encing = provider.GetEncoding(codepage, enc, dec);
if (encing != null)
return encing;
}
return null;
}
internal static Encoding GetEncodingFromProvider(string encodingName, EncoderFallback enc, DecoderFallback dec)
{
if (s_providers == null)
return null;
var providers = s_providers;
foreach (EncodingProvider provider in providers)
{
Encoding encoding = provider.GetEncoding(encodingName, enc, dec);
if (encoding != null)
return encoding;
}
return null;
}
private static Object s_InternalSyncObject = new Object();
private static volatile EncodingProvider[] s_providers;
}
}
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