2 // DecoderReplacementFallbackBuffer.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
26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
34 // This DecoderFallbackBuffer is simple. It ignores the input buffers.
35 // DecoderFallbackBuffer users could implement their own complex
38 public sealed class DecoderReplacementFallbackBuffer
39 : DecoderFallbackBuffer
41 bool fallback_assigned
;
45 public DecoderReplacementFallbackBuffer (
46 DecoderReplacementFallback fallback
)
49 throw new ArgumentNullException ("fallback");
50 replacement
= fallback
.DefaultString
;
54 public override int Remaining
{
55 get { return fallback_assigned ? replacement.Length - current : 0; }
58 public override bool Fallback (byte [] bytesUnknown
, int index
)
60 if (bytesUnknown
== null)
61 throw new ArgumentNullException ("bytesUnknown");
62 if (fallback_assigned
&& Remaining
!= 0)
63 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.");
64 if (index
< 0 || bytesUnknown
.Length
< index
)
65 throw new ArgumentOutOfRangeException ("index");
66 fallback_assigned
= true;
69 return replacement
.Length
> 0;
72 public override char GetNextChar ()
74 if (!fallback_assigned
)
76 if (current
>= replacement
.Length
)
78 return replacement
[current
++];
81 public override bool MovePrevious ()
89 public override void Reset ()
91 fallback_assigned
= false;