DecoderExceptionFallback.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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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