2 // EncoderReplacementFallbackBuffer.cs
5 // Atsushi Enomoto <atsushi@ximian.com>
9 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
11 // Permission is hereby granted, free of charge, to any person obtaining
12 // a copy of this software and associated documentation files (the
13 // "Software"), to deal in the Software without restriction, including
14 // without limitation the rights to use, copy, modify, merge, publish,
15 // distribute, sublicense, and/or sell copies of the Software, and to
16 // permit persons to whom the Software is furnished to do so, subject to
17 // the following conditions:
19 // The above copyright notice and this permission notice shall be
20 // included in all copies or substantial portions of the Software.
22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 #if NET_2_0 || NET_2_0_BOOTSTRAP
35 // This EncoderFallbackBuffer is simple. It ignores the input buffers.
36 // EncoderFallbackBuffer users could implement their own complex
39 public sealed class EncoderReplacementFallbackBuffer
40 : EncoderFallbackBuffer
44 bool fallback_assigned;
46 public EncoderReplacementFallbackBuffer (
47 EncoderReplacementFallback fallback)
50 throw new ArgumentNullException ("fallback");
51 replacement = fallback.DefaultString;
55 public override int Remaining {
56 get { return replacement.Length - current; }
59 public override bool Fallback (char charUnknown, int index)
61 return Fallback (index);
64 public override bool Fallback (char charUnknownHigh, char charUnknownLow, int index)
66 return Fallback (index);
69 // hmm, what is this index for???
70 private bool Fallback (int index)
72 if (fallback_assigned && Remaining != 0)
73 throw new ArgumentException ("Reentrant Fallback method invocation occured. It might be because either this FallbackBuffer is incorrectly shared by multiple threads, invoked inside Encoding recursively, or Reset invocation is forgotten.");
75 throw new ArgumentOutOfRangeException ("index");
76 fallback_assigned = true;
79 return replacement.Length > 0;
82 public override char GetNextChar ()
84 if (current >= replacement.Length)
86 return replacement [current++];
89 public override bool MovePrevious ()
97 public override void Reset ()