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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
// EncoderExceptionFallback.cs
namespace System.Text
{
using System;
using System.Runtime.Serialization;
using System.Diagnostics.Contracts;
[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 EncoderExceptionFallbackBuffer(){}
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));
}
Contract.EndContractBlock();
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));
}
Contract.EndContractBlock();
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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