Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Text / DecoderExceptionFallback.cs / 1 / DecoderExceptionFallback.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // DecoderExceptionFallback.cs // namespace System.Text { using System; using System.Runtime.Serialization; using System.Globalization; [Serializable] public sealed class DecoderExceptionFallback : DecoderFallback { // Construction public DecoderExceptionFallback() { } public override DecoderFallbackBuffer CreateFallbackBuffer() { return new DecoderExceptionFallbackBuffer(); } // Maximum number of characters that this instance of this fallback could return public override int MaxCharCount { get { return 0; } } public override bool Equals(Object value) { DecoderExceptionFallback that = value as DecoderExceptionFallback; if (that != null) { return (true); } return (false); } public override int GetHashCode() { return 879; } } public sealed class DecoderExceptionFallbackBuffer : DecoderFallbackBuffer { public override bool Fallback(byte[] bytesUnknown, int index) { Throw(bytesUnknown, index); return true; } public override char GetNextChar() { return (char)0; } public override bool MovePrevious() { // Exception fallback doesn't have anywhere to back up to. return false; } // Exceptions are always empty public override int Remaining { get { return 0; } } private void Throw(byte[] bytesUnknown, int index) { // Create a string representation of our bytes. StringBuilder strBytes = new StringBuilder(bytesUnknown.Length * 3); int i; for (i = 0; i < bytesUnknown.Length && i < 20; i++) { strBytes.Append("["); strBytes.Append(bytesUnknown[i].ToString("X2", CultureInfo.InvariantCulture)); strBytes.Append("]"); } // In case the string's really long if (i == 20) strBytes.Append(" ..."); // Known index throw new DecoderFallbackException( Environment.GetResourceString("Argument_InvalidCodePageBytesIndex", strBytes, index), bytesUnknown, index); } } // Exception for decoding unknown byte sequences. [Serializable] public sealed class DecoderFallbackException : ArgumentException { byte[] bytesUnknown = null; int index = 0; public DecoderFallbackException() : base(Environment.GetResourceString("Arg_ArgumentException")) { SetErrorCode(__HResults.COR_E_ARGUMENT); } public DecoderFallbackException(String message) : base(message) { SetErrorCode(__HResults.COR_E_ARGUMENT); } public DecoderFallbackException(String message, Exception innerException) : base(message, innerException) { SetErrorCode(__HResults.COR_E_ARGUMENT); } internal DecoderFallbackException(SerializationInfo info, StreamingContext context) : base(info, context) { } public DecoderFallbackException( String message, byte[] bytesUnknown, int index) : base(message) { this.bytesUnknown = bytesUnknown; this.index = index; } public byte[] BytesUnknown { get { return (bytesUnknown); } } public int Index { get { return this.index; } } } }
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