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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Runtime.Serialization;
using System.Globalization;
namespace System.Text
{
[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(
SR.Format(SR.Argument_InvalidCodePageBytesIndex, strBytes, index), bytesUnknown, index);
}
}
// Exception for decoding unknown byte sequences.
[Serializable]
public sealed class DecoderFallbackException : ArgumentException
{
private byte[] bytesUnknown = null;
private int index = 0;
public DecoderFallbackException()
: base(SR.Arg_ArgumentException)
{
HResult = __HResults.COR_E_ARGUMENT;
}
public DecoderFallbackException(String message)
: base(message)
{
HResult = __HResults.COR_E_ARGUMENT;
}
public DecoderFallbackException(String message, Exception innerException)
: base(message, innerException)
{
HResult = __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 index;
}
}
}
}
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