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
|
// Copyright (c) 2004-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
// MySQL Connectors. There are special exceptions to the terms and
// conditions of the GPLv2 as it is applied to this software, see the
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
using System;
using System.Collections;
using System.Text;
using MySql.Data.Common;
using System.Collections.Generic;
using System.Data;
namespace MySql.Data.MySqlClient
{
/// <summary>
/// Summary description for CharSetMap.
/// </summary>
internal class CharSetMap
{
private static Dictionary<string, string> defaultCollations;
private static Dictionary<string, int> maxLengths;
private static Dictionary<string, CharacterSet> mapping;
private static object lockObject;
// we use a static constructor here since we only want to init
// the mapping once
static CharSetMap()
{
lockObject = new Object();
InitializeMapping();
}
public static CharacterSet GetCharacterSet(DBVersion version, string CharSetName)
{
CharacterSet cs = (CharacterSet) mapping[CharSetName];
if (cs == null)
throw new MySqlException("Character set '" + CharSetName + "' is not supported");
return cs;
}
/// <summary>
/// Returns the text encoding for a given MySQL character set name
/// </summary>
/// <param name="version">Version of the connection requesting the encoding</param>
/// <param name="CharSetName">Name of the character set to get the encoding for</param>
/// <returns>Encoding object for the given character set name</returns>
public static Encoding GetEncoding(DBVersion version, string CharSetName)
{
try
{
CharacterSet cs = GetCharacterSet(version, CharSetName);
return Encoding.GetEncoding(cs.name);
}
catch (NotSupportedException)
{
return Encoding.GetEncoding(0);
}
}
/// <summary>
///
/// </summary>
private static void InitializeMapping()
{
LoadCharsetMap();
}
private static void LoadCharsetMap()
{
mapping = new Dictionary<string, CharacterSet>();
mapping.Add("latin1", new CharacterSet("windows-1252", 1));
mapping.Add("big5", new CharacterSet("big5", 2));
mapping.Add("dec8", mapping["latin1"]);
mapping.Add("cp850", new CharacterSet("ibm850", 1));
mapping.Add("hp8", mapping["latin1"]);
mapping.Add("koi8r", new CharacterSet("koi8-u", 1));
mapping.Add("latin2", new CharacterSet("latin2", 1));
mapping.Add("swe7", mapping["latin1"]);
mapping.Add("ujis", new CharacterSet("EUC-JP", 3));
mapping.Add("eucjpms", mapping["ujis"]);
mapping.Add("sjis", new CharacterSet("sjis", 2));
mapping.Add("cp932", mapping["sjis"]);
mapping.Add("hebrew", new CharacterSet("hebrew", 1));
mapping.Add("tis620", new CharacterSet("windows-874", 1));
mapping.Add("euckr", new CharacterSet("euc-kr", 2));
mapping.Add("euc_kr", mapping["euckr"]);
mapping.Add("koi8u", new CharacterSet("koi8-u", 1));
mapping.Add("koi8_ru", mapping["koi8u"]);
mapping.Add("gb2312", new CharacterSet("gb2312", 2));
mapping.Add("gbk", mapping["gb2312"]);
mapping.Add("greek", new CharacterSet("greek", 1));
mapping.Add("cp1250", new CharacterSet("windows-1250", 1));
mapping.Add("win1250", mapping["cp1250"]);
mapping.Add("latin5", new CharacterSet("latin5", 1));
mapping.Add("armscii8", mapping["latin1"]);
mapping.Add("utf8", new CharacterSet("utf-8", 3));
mapping.Add("ucs2", new CharacterSet("UTF-16BE", 2));
mapping.Add("cp866", new CharacterSet("cp866", 1));
mapping.Add("keybcs2", mapping["latin1"]);
mapping.Add("macce", new CharacterSet("x-mac-ce", 1));
mapping.Add("macroman", new CharacterSet("x-mac-romanian", 1));
mapping.Add("cp852", new CharacterSet("ibm852", 2));
mapping.Add("latin7", new CharacterSet("iso-8859-7", 1));
mapping.Add("cp1251", new CharacterSet("windows-1251", 1));
mapping.Add("win1251ukr", mapping["cp1251"]);
mapping.Add("cp1251csas", mapping["cp1251"]);
mapping.Add("cp1251cias", mapping["cp1251"]);
mapping.Add("win1251", mapping["cp1251"]);
mapping.Add("cp1256", new CharacterSet("cp1256", 1));
mapping.Add("cp1257", new CharacterSet("windows-1257", 1));
mapping.Add("ascii", new CharacterSet("us-ascii", 1));
mapping.Add("usa7", mapping["ascii"]);
mapping.Add("binary", mapping["ascii"]);
mapping.Add("latin3", new CharacterSet("latin3", 1));
mapping.Add("latin4", new CharacterSet("latin4", 1));
mapping.Add("latin1_de", new CharacterSet("iso-8859-1", 1));
mapping.Add("german1", new CharacterSet("iso-8859-1", 1));
mapping.Add("danish", new CharacterSet("iso-8859-1", 1));
mapping.Add("czech", new CharacterSet("iso-8859-2", 1));
mapping.Add("hungarian", new CharacterSet("iso-8859-2", 1));
mapping.Add("croat", new CharacterSet("iso-8859-2", 1));
mapping.Add("latvian", new CharacterSet("iso-8859-13", 1));
mapping.Add("latvian1", new CharacterSet("iso-8859-13", 1));
mapping.Add("estonia", new CharacterSet("iso-8859-13", 1));
mapping.Add("dos", new CharacterSet("ibm437", 1));
mapping.Add("utf8mb4", new CharacterSet("utf-8", 4));
}
internal static void InitCollections(MySqlConnection connection)
{
defaultCollations = new Dictionary<string, string>();
maxLengths = new Dictionary<string, int>();
MySqlCommand cmd = new MySqlCommand("SHOW CHARSET", connection);
using (MySqlDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
defaultCollations.Add(reader.GetString(0), reader.GetString(2));
maxLengths.Add(reader.GetString(0), Convert.ToInt32(reader.GetValue(3)));
}
}
}
internal static string GetDefaultCollation(string charset, MySqlConnection connection)
{
lock (lockObject)
{
if (defaultCollations == null)
InitCollections(connection);
}
if (!defaultCollations.ContainsKey(charset))
return null;
return defaultCollations[charset];
}
internal static int GetMaxLength(string charset, MySqlConnection connection)
{
lock (lockObject)
{
if (maxLengths == null)
InitCollections(connection);
}
if (!maxLengths.ContainsKey(charset))
return 1;
return maxLengths[charset];
}
}
internal class CharacterSet
{
public string name;
public int byteCount;
public CharacterSet(string name, int byteCount)
{
this.name = name;
this.byteCount = byteCount;
}
}
}
|
