EncoderExceptionFallback.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Text / EncoderExceptionFallback.cs / 1 / EncoderExceptionFallback.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// EncoderExceptionFallback.cs
namespace System.Text 
{ 
    using System;
    using System.Runtime.Serialization; 

    [Serializable]
    public sealed class EncoderExceptionFallback : EncoderFallback
    { 
        // Construction
        public EncoderExceptionFallback() 
        { 
        }
 
        public override EncoderFallbackBuffer CreateFallbackBuffer()
        {
            return new EncoderExceptionFallbackBuffer();
        } 

        // 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) 
        { 
            EncoderExceptionFallback that = value as EncoderExceptionFallback;
            if (that != null) 
            {
                return (true);
            }
            return (false); 
        }
 
        public override int GetHashCode() 
        {
            return 654; 
        }
    }

 
    public sealed class EncoderExceptionFallbackBuffer : EncoderFallbackBuffer
    { 
        public override bool Fallback(char charUnknown, int index) 
        {
            // Fall back our char 
            throw new EncoderFallbackException(
                Environment.GetResourceString("Argument_InvalidCodePageConversionIndex",
                    (int)charUnknown, index), charUnknown, index);
        } 

        public override bool Fallback(char charUnknownHigh, char charUnknownLow, int index) 
        { 
            if (!Char.IsHighSurrogate(charUnknownHigh))
            { 
                throw new ArgumentOutOfRangeException("charUnknownHigh",
                    Environment.GetResourceString("ArgumentOutOfRange_Range",
                    0xD800, 0xDBFF));
            } 
            if (!Char.IsLowSurrogate(charUnknownLow))
            { 
                throw new ArgumentOutOfRangeException("CharUnknownLow", 
                    Environment.GetResourceString("ArgumentOutOfRange_Range",
                    0xDC00, 0xDFFF)); 
            }

            int iTemp = Char.ConvertToUtf32(charUnknownHigh, charUnknownLow);
 
            // Fall back our char
            throw new EncoderFallbackException( 
                Environment.GetResourceString("Argument_InvalidCodePageConversionIndex", 
                    iTemp, index), charUnknownHigh, charUnknownLow, index);
        } 

        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; 
            }
        }
    }
 
    [Serializable]
    public sealed class EncoderFallbackException : ArgumentException 
    { 
        char    charUnknown;
        char    charUnknownHigh; 
        char    charUnknownLow;
        int     index;

        public EncoderFallbackException() 
            : base(Environment.GetResourceString("Arg_ArgumentException"))
        { 
            SetErrorCode(__HResults.COR_E_ARGUMENT); 
        }
 
        public EncoderFallbackException(String message)
            : base(message)
        {
            SetErrorCode(__HResults.COR_E_ARGUMENT); 
        }
 
        public EncoderFallbackException(String message, Exception innerException) 
            : base(message, innerException)
        { 
            SetErrorCode(__HResults.COR_E_ARGUMENT);
        }

        internal EncoderFallbackException(SerializationInfo info, StreamingContext context) : base(info, context) 
        {
        } 
 
        internal EncoderFallbackException(
            String message, char charUnknown, int index) : base(message) 
        {
            this.charUnknown = charUnknown;
            this.index = index;
        } 

        internal EncoderFallbackException( 
            String message, char charUnknownHigh, char charUnknownLow, int index) : base(message) 
        {
            if (!Char.IsHighSurrogate(charUnknownHigh)) 
            {
                throw new ArgumentOutOfRangeException("charUnknownHigh",
                    Environment.GetResourceString("ArgumentOutOfRange_Range",
                    0xD800, 0xDBFF)); 
            }
            if (!Char.IsLowSurrogate(charUnknownLow)) 
            { 
                throw new ArgumentOutOfRangeException("CharUnknownLow",
                    Environment.GetResourceString("ArgumentOutOfRange_Range", 
                    0xDC00, 0xDFFF));
            }

            this.charUnknownHigh = charUnknownHigh; 
            this.charUnknownLow = charUnknownLow;
            this.index = index; 
        } 

        public char CharUnknown 
        {
            get
            {
                return (charUnknown); 
            }
        } 
 
        public char CharUnknownHigh
        { 
            get
            {
                return (charUnknownHigh);
            } 
        }
 
        public char CharUnknownLow 
        {
            get 
            {
                return (charUnknownLow);
            }
        } 

        public int Index 
        { 
            get
            { 
                return index;
            }
        }
 
        // Return true if the unknown character is a surrogate pair.
        public bool IsUnknownSurrogate() 
        { 
            return (this.charUnknownHigh != '\0');
        } 
    }
}
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EncoderExceptionFallback.cs source code in C# .NET

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