1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
// 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.
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(nameof(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(nameof(charUnknownHigh),
Environment.GetResourceString("ArgumentOutOfRange_Range",
0xD800, 0xDBFF));
}
if (!Char.IsLowSurrogate(charUnknownLow))
{
throw new ArgumentOutOfRangeException(nameof(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');
}
}
}
|
