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Diffstat (limited to 'src/mscorlib/src/System/Text/EncodingProvider.cs')
-rw-r--r--src/mscorlib/src/System/Text/EncodingProvider.cs137
1 files changed, 137 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Text/EncodingProvider.cs b/src/mscorlib/src/System/Text/EncodingProvider.cs
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index 0000000000..b1dea2cd3c
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+++ b/src/mscorlib/src/System/Text/EncodingProvider.cs
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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;
+ }
+}