96 lines
2.9 KiB
C#
96 lines
2.9 KiB
C#
//
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// DecoderReplacementFallbackBuffer.cs
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//
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// Author:
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// Atsushi Enomoto <atsushi@ximian.com>
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//
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//
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// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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namespace System.Text
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{
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// This DecoderFallbackBuffer is simple. It ignores the input buffers.
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// DecoderFallbackBuffer users could implement their own complex
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// fallback buffers.
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public sealed class DecoderReplacementFallbackBuffer
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: DecoderFallbackBuffer
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{
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bool fallback_assigned;
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int current;
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string replacement;
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public DecoderReplacementFallbackBuffer (
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DecoderReplacementFallback fallback)
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{
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if (fallback == null)
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throw new ArgumentNullException ("fallback");
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replacement = fallback.DefaultString;
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current = 0;
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}
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public override int Remaining {
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get { return fallback_assigned ? replacement.Length - current : 0; }
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}
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public override bool Fallback (byte [] bytesUnknown, int index)
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{
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if (bytesUnknown == null)
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throw new ArgumentNullException ("bytesUnknown");
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if (fallback_assigned && Remaining != 0)
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throw new ArgumentException ("Reentrant Fallback method invocation occurred. It might be because either this FallbackBuffer is incorrectly shared by multiple threads, invoked inside Encoding recursively, or Reset invocation is forgotten.");
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if (index < 0 || bytesUnknown.Length < index)
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throw new ArgumentOutOfRangeException ("index");
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fallback_assigned = true;
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current = 0;
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return replacement.Length > 0;
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}
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public override char GetNextChar ()
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{
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if (!fallback_assigned)
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return '\0';
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if (current >= replacement.Length)
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return char.MinValue;
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return replacement [current++];
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}
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public override bool MovePrevious ()
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{
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if (current == 0)
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return false;
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current--;
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return true;
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}
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public override void Reset ()
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{
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fallback_assigned = false;
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current = 0;
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}
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}
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}
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