| | | 1 | | // Licensed to the .NET Foundation under one or more agreements. |
| | | 2 | | // The .NET Foundation licenses this file to you under the MIT license. |
| | | 3 | | |
| | | 4 | | using System.Collections.Generic; |
| | | 5 | | using System.Threading; |
| | | 6 | | |
| | | 7 | | namespace System.Text |
| | | 8 | | { |
| | | 9 | | public abstract class EncodingProvider |
| | | 10 | | { |
| | | 11 | | private static EncodingProvider[]? s_providers; |
| | | 12 | | |
| | 0 | 13 | | public EncodingProvider() { } |
| | | 14 | | public abstract Encoding? GetEncoding(string name); |
| | | 15 | | public abstract Encoding? GetEncoding(int codepage); |
| | | 16 | | |
| | | 17 | | // GetEncoding should return either valid encoding or null. shouldn't throw any exception except on null name |
| | | 18 | | public virtual Encoding? GetEncoding(string name, EncoderFallback encoderFallback, DecoderFallback decoderFallba |
| | | 19 | | { |
| | 0 | 20 | | Encoding? enc = GetEncoding(name); |
| | 0 | 21 | | if (enc != null) |
| | | 22 | | { |
| | 0 | 23 | | enc = (Encoding)enc.Clone(); |
| | 0 | 24 | | enc.EncoderFallback = encoderFallback; |
| | 0 | 25 | | enc.DecoderFallback = decoderFallback; |
| | | 26 | | } |
| | | 27 | | |
| | 0 | 28 | | return enc; |
| | | 29 | | } |
| | | 30 | | |
| | | 31 | | public virtual Encoding? GetEncoding(int codepage, EncoderFallback encoderFallback, DecoderFallback decoderFallb |
| | | 32 | | { |
| | 0 | 33 | | Encoding? enc = GetEncoding(codepage); |
| | 0 | 34 | | if (enc != null) |
| | | 35 | | { |
| | 0 | 36 | | enc = (Encoding)enc.Clone(); |
| | 0 | 37 | | enc.EncoderFallback = encoderFallback; |
| | 0 | 38 | | enc.DecoderFallback = decoderFallback; |
| | | 39 | | } |
| | | 40 | | |
| | 0 | 41 | | return enc; |
| | | 42 | | } |
| | | 43 | | |
| | 0 | 44 | | public virtual IEnumerable<EncodingInfo> GetEncodings() => []; |
| | | 45 | | |
| | | 46 | | internal static void AddProvider(EncodingProvider provider) |
| | | 47 | | { |
| | 0 | 48 | | ArgumentNullException.ThrowIfNull(provider); |
| | | 49 | | |
| | | 50 | | // Few providers are added in a typical app (typically just CodePagesEncodingProvider.Instance), and when th |
| | | 51 | | // they're generally not added concurrently. So use an optimistic concurrency scheme rather than paying for |
| | | 52 | | // object allocation on the startup path. |
| | | 53 | | |
| | 0 | 54 | | if (s_providers is null && |
| | 0 | 55 | | Interlocked.CompareExchange(ref s_providers, [provider], null) is null) |
| | | 56 | | { |
| | 0 | 57 | | return; |
| | | 58 | | } |
| | | 59 | | |
| | | 60 | | while (true) |
| | | 61 | | { |
| | 0 | 62 | | EncodingProvider[] providers = s_providers; |
| | | 63 | | |
| | 0 | 64 | | if (Array.IndexOf(providers, provider) >= 0) |
| | | 65 | | { |
| | 0 | 66 | | return; |
| | | 67 | | } |
| | | 68 | | |
| | 0 | 69 | | var newProviders = new EncodingProvider[providers.Length + 1]; |
| | 0 | 70 | | Array.Copy(providers, newProviders, providers.Length); |
| | 0 | 71 | | newProviders[^1] = provider; |
| | | 72 | | |
| | 0 | 73 | | if (Interlocked.CompareExchange(ref s_providers, newProviders, providers) == providers) |
| | | 74 | | { |
| | 0 | 75 | | return; |
| | | 76 | | } |
| | | 77 | | } |
| | | 78 | | } |
| | | 79 | | |
| | | 80 | | internal static Encoding? GetEncodingFromProvider(int codepage) |
| | | 81 | | { |
| | 3 | 82 | | EncodingProvider[]? providers = s_providers; |
| | 3 | 83 | | if (providers == null) |
| | 3 | 84 | | return null; |
| | | 85 | | |
| | 0 | 86 | | foreach (EncodingProvider provider in providers) |
| | | 87 | | { |
| | 0 | 88 | | Encoding? enc = provider.GetEncoding(codepage); |
| | 0 | 89 | | if (enc != null) |
| | 0 | 90 | | return enc; |
| | | 91 | | } |
| | | 92 | | |
| | 0 | 93 | | return null; |
| | | 94 | | } |
| | | 95 | | |
| | | 96 | | internal static Dictionary<int, EncodingInfo>? GetEncodingListFromProviders() |
| | | 97 | | { |
| | 0 | 98 | | EncodingProvider[]? providers = s_providers; |
| | 0 | 99 | | if (providers == null) |
| | 0 | 100 | | return null; |
| | | 101 | | |
| | 0 | 102 | | Dictionary<int, EncodingInfo> result = new Dictionary<int, EncodingInfo>(); |
| | | 103 | | |
| | 0 | 104 | | foreach (EncodingProvider provider in providers) |
| | | 105 | | { |
| | 0 | 106 | | IEnumerable<EncodingInfo>? encodingInfoList = provider.GetEncodings(); |
| | 0 | 107 | | if (encodingInfoList != null) |
| | | 108 | | { |
| | 0 | 109 | | foreach (EncodingInfo ei in encodingInfoList) |
| | | 110 | | { |
| | 0 | 111 | | result.TryAdd(ei.CodePage, ei); |
| | | 112 | | } |
| | | 113 | | } |
| | | 114 | | } |
| | | 115 | | |
| | 0 | 116 | | return result; |
| | | 117 | | } |
| | | 118 | | |
| | | 119 | | internal static Encoding? GetEncodingFromProvider(string encodingName) |
| | | 120 | | { |
| | 0 | 121 | | EncodingProvider[]? providers = s_providers; |
| | 0 | 122 | | if (providers == null) |
| | 0 | 123 | | return null; |
| | | 124 | | |
| | 0 | 125 | | foreach (EncodingProvider provider in providers) |
| | | 126 | | { |
| | 0 | 127 | | Encoding? enc = provider.GetEncoding(encodingName); |
| | 0 | 128 | | if (enc != null) |
| | 0 | 129 | | return enc; |
| | | 130 | | } |
| | | 131 | | |
| | 0 | 132 | | return null; |
| | | 133 | | } |
| | | 134 | | |
| | | 135 | | internal static Encoding? GetEncodingFromProvider(int codepage, EncoderFallback enc, DecoderFallback dec) |
| | | 136 | | { |
| | 1 | 137 | | EncodingProvider[]? providers = s_providers; |
| | 1 | 138 | | if (providers == null) |
| | 1 | 139 | | return null; |
| | | 140 | | |
| | 0 | 141 | | foreach (EncodingProvider provider in providers) |
| | | 142 | | { |
| | 0 | 143 | | Encoding? encoding = provider.GetEncoding(codepage, enc, dec); |
| | 0 | 144 | | if (encoding != null) |
| | 0 | 145 | | return encoding; |
| | | 146 | | } |
| | | 147 | | |
| | 0 | 148 | | return null; |
| | | 149 | | } |
| | | 150 | | |
| | | 151 | | internal static Encoding? GetEncodingFromProvider(string encodingName, EncoderFallback enc, DecoderFallback dec) |
| | | 152 | | { |
| | 1 | 153 | | EncodingProvider[]? providers = s_providers; |
| | 1 | 154 | | if (providers == null) |
| | 1 | 155 | | return null; |
| | | 156 | | |
| | 0 | 157 | | foreach (EncodingProvider provider in providers) |
| | | 158 | | { |
| | 0 | 159 | | Encoding? encoding = provider.GetEncoding(encodingName, enc, dec); |
| | 0 | 160 | | if (encoding != null) |
| | 0 | 161 | | return encoding; |
| | | 162 | | } |
| | | 163 | | |
| | 0 | 164 | | return null; |
| | | 165 | | } |
| | | 166 | | } |
| | | 167 | | } |
| | | 168 | | |