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#if MYSQL_6_10
// Copyright ?2004, 2016, Oracle and/or its affiliates. All rights reserved.
//
// 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.Generic;using System.Text;using Externals.MySql.Data.Common;
namespace Externals.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 readonly 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) { if (charSetName == null) throw new ArgumentNullException("CharSetName is null"); CharacterSet cs = null; if (_mapping.ContainsKey(charSetName)) cs = _mapping[charSetName];
if (cs == null) throw new NotSupportedException("Character set '" + charSetName + "' is not supported by .Net Framework."); 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);
#if NETSTANDARD1_3
Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);#endif
return Encoding.GetEncoding(cs.name); } catch (ArgumentException) { return Encoding.GetEncoding("utf-8"); } catch (NotSupportedException) { return Encoding.GetEncoding("utf-8"); } }
/// <summary>
/// Initializes the mapping.
/// </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)); _mapping.Add("utf16", new CharacterSet("utf-16BE", 2)); _mapping.Add("utf16le", new CharacterSet("utf-16", 2)); _mapping.Add("utf32", new CharacterSet("utf-32BE", 4)); _mapping.Add("gb18030", new CharacterSet("gb18030", 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); } return !_defaultCollations.ContainsKey(charset) ? null : _defaultCollations[charset]; }
internal static int GetMaxLength(string charset, MySqlConnection connection) { lock (LockObject) { if (_maxLengths == null) InitCollections(connection); }
return !_maxLengths.ContainsKey(charset) ? 1 : _maxLengths[charset]; } }
internal class CharacterSet { public string name; public int byteCount;
public CharacterSet(string name, int byteCount) { this.name = name; this.byteCount = byteCount; } }}
#endif
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