1246 lines
44 KiB
Java
1246 lines
44 KiB
Java
/****************************************************************
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* Licensed to the Apache Software Foundation (ASF) under one *
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* or more contributor license agreements. See the NOTICE file *
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* distributed with this work for additional information *
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* regarding copyright ownership. The ASF licenses this file *
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* to you under the Apache License, Version 2.0 (the *
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* "License"); you may not use this file except in compliance *
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* with the License. You may obtain a copy of the License at *
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* *
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* http://www.apache.org/licenses/LICENSE-2.0 *
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* *
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* Unless required by applicable law or agreed to in writing, *
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* software distributed under the License is distributed on an *
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY *
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* KIND, either express or implied. See the License for the *
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* specific language governing permissions and limitations *
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* under the License. *
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****************************************************************/
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package org.apache.james.mime4j.util;
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import java.io.UnsupportedEncodingException;
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import java.nio.charset.IllegalCharsetNameException;
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import java.nio.charset.UnsupportedCharsetException;
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import java.util.HashMap;
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import java.util.TreeSet;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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/**
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* Utility class for working with character sets. It is somewhat similar to
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* the Java 1.4 <code>java.nio.charset.Charset</code> class but knows many
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* more aliases and is compatible with Java 1.3. It will use a simple detection
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* mechanism to detect what character sets the current VM supports. This will
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* be a sub-set of the character sets listed in the
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* <a href="http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html">
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* Java 1.5 (J2SE5.0) Supported Encodings</a> document.
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* <p>
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* The <a href="http://www.iana.org/assignments/character-sets">
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* IANA Character Sets</a> document has been used to determine the preferred
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* MIME character set names and to get a list of known aliases.
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* <p>
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* This is a complete list of the character sets known to this class:
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* <table>
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* <tr>
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* <td>Canonical (Java) name</td>
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* <td>MIME preferred</td>
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* <td>Aliases</td>
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* </tr>
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* <tr>
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* <td>ASCII</td>
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* <td>US-ASCII</td>
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* <td>ANSI_X3.4-1968 iso-ir-6 ANSI_X3.4-1986 ISO_646.irv:1991 ISO646-US us IBM367 cp367 csASCII ascii7 646 iso_646.irv:1983 </td>
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* </tr>
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* <tr>
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* <td>Big5</td>
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* <td>Big5</td>
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* <td>csBig5 CN-Big5 BIG-FIVE BIGFIVE </td>
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* </tr>
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* <tr>
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* <td>Big5_HKSCS</td>
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* <td>Big5-HKSCS</td>
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* <td>big5hkscs </td>
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* </tr>
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* <tr>
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* <td>Big5_Solaris</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp037</td>
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* <td>IBM037</td>
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* <td>ebcdic-cp-us ebcdic-cp-ca ebcdic-cp-wt ebcdic-cp-nl csIBM037 </td>
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* </tr>
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* <tr>
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* <td>Cp1006</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1025</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1026</td>
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* <td>IBM1026</td>
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* <td>csIBM1026 </td>
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* </tr>
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* <tr>
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* <td>Cp1046</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1047</td>
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* <td>IBM1047</td>
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* <td>IBM-1047 </td>
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* </tr>
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* <tr>
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* <td>Cp1097</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1098</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1112</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1122</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1123</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1124</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1140</td>
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* <td>IBM01140</td>
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* <td>CCSID01140 CP01140 ebcdic-us-37+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1141</td>
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* <td>IBM01141</td>
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* <td>CCSID01141 CP01141 ebcdic-de-273+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1142</td>
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* <td>IBM01142</td>
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* <td>CCSID01142 CP01142 ebcdic-dk-277+euro ebcdic-no-277+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1143</td>
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* <td>IBM01143</td>
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* <td>CCSID01143 CP01143 ebcdic-fi-278+euro ebcdic-se-278+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1144</td>
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* <td>IBM01144</td>
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* <td>CCSID01144 CP01144 ebcdic-it-280+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1145</td>
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* <td>IBM01145</td>
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* <td>CCSID01145 CP01145 ebcdic-es-284+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1146</td>
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* <td>IBM01146</td>
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* <td>CCSID01146 CP01146 ebcdic-gb-285+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1147</td>
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* <td>IBM01147</td>
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* <td>CCSID01147 CP01147 ebcdic-fr-297+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1148</td>
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* <td>IBM01148</td>
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* <td>CCSID01148 CP01148 ebcdic-international-500+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1149</td>
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* <td>IBM01149</td>
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* <td>CCSID01149 CP01149 ebcdic-is-871+euro </td>
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* </tr>
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* <tr>
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* <td>Cp1250</td>
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* <td>windows-1250</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1251</td>
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* <td>windows-1251</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1252</td>
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* <td>windows-1252</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1253</td>
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* <td>windows-1253</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1254</td>
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* <td>windows-1254</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1255</td>
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* <td>windows-1255</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1256</td>
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* <td>windows-1256</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1257</td>
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* <td>windows-1257</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1258</td>
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* <td>windows-1258</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1381</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp1383</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp273</td>
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* <td>IBM273</td>
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* <td>csIBM273 </td>
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* </tr>
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* <tr>
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* <td>Cp277</td>
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* <td>IBM277</td>
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* <td>EBCDIC-CP-DK EBCDIC-CP-NO csIBM277 </td>
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* </tr>
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* <tr>
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* <td>Cp278</td>
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* <td>IBM278</td>
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* <td>CP278 ebcdic-cp-fi ebcdic-cp-se csIBM278 </td>
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* </tr>
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* <tr>
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* <td>Cp280</td>
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* <td>IBM280</td>
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* <td>ebcdic-cp-it csIBM280 </td>
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* </tr>
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* <tr>
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* <td>Cp284</td>
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* <td>IBM284</td>
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* <td>ebcdic-cp-es csIBM284 </td>
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* </tr>
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* <tr>
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* <td>Cp285</td>
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* <td>IBM285</td>
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* <td>ebcdic-cp-gb csIBM285 </td>
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* </tr>
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* <tr>
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* <td>Cp297</td>
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* <td>IBM297</td>
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* <td>ebcdic-cp-fr csIBM297 </td>
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* </tr>
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* <tr>
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* <td>Cp33722</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp420</td>
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* <td>IBM420</td>
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* <td>ebcdic-cp-ar1 csIBM420 </td>
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* </tr>
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* <tr>
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* <td>Cp424</td>
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* <td>IBM424</td>
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* <td>ebcdic-cp-he csIBM424 </td>
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* </tr>
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* <tr>
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* <td>Cp437</td>
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* <td>IBM437</td>
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* <td>437 csPC8CodePage437 </td>
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* </tr>
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* <tr>
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* <td>Cp500</td>
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* <td>IBM500</td>
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* <td>ebcdic-cp-be ebcdic-cp-ch csIBM500 </td>
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* </tr>
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* <tr>
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* <td>Cp737</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp775</td>
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* <td>IBM775</td>
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* <td>csPC775Baltic </td>
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* </tr>
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* <tr>
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* <td>Cp838</td>
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* <td>IBM-Thai</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp850</td>
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* <td>IBM850</td>
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* <td>850 csPC850Multilingual </td>
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* </tr>
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* <tr>
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* <td>Cp852</td>
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* <td>IBM852</td>
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* <td>852 csPCp852 </td>
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* </tr>
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* <tr>
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* <td>Cp855</td>
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* <td>IBM855</td>
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* <td>855 csIBM855 </td>
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* </tr>
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* <tr>
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* <td>Cp856</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp857</td>
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* <td>IBM857</td>
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* <td>857 csIBM857 </td>
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* </tr>
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* <tr>
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* <td>Cp858</td>
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* <td>IBM00858</td>
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* <td>CCSID00858 CP00858 PC-Multilingual-850+euro </td>
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* </tr>
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* <tr>
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* <td>Cp860</td>
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* <td>IBM860</td>
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* <td>860 csIBM860 </td>
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* </tr>
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* <tr>
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* <td>Cp861</td>
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* <td>IBM861</td>
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* <td>861 cp-is csIBM861 </td>
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* </tr>
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* <tr>
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* <td>Cp862</td>
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* <td>IBM862</td>
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* <td>862 csPC862LatinHebrew </td>
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* </tr>
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* <tr>
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* <td>Cp863</td>
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* <td>IBM863</td>
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* <td>863 csIBM863 </td>
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* </tr>
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* <tr>
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* <td>Cp864</td>
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* <td>IBM864</td>
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* <td>cp864 csIBM864 </td>
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* </tr>
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* <tr>
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* <td>Cp865</td>
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* <td>IBM865</td>
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* <td>865 csIBM865 </td>
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* </tr>
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* <tr>
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* <td>Cp866</td>
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* <td>IBM866</td>
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* <td>866 csIBM866 </td>
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* </tr>
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* <tr>
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* <td>Cp868</td>
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* <td>IBM868</td>
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* <td>cp-ar csIBM868 </td>
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* </tr>
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* <tr>
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* <td>Cp869</td>
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* <td>IBM869</td>
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* <td>cp-gr csIBM869 </td>
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* </tr>
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* <tr>
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* <td>Cp870</td>
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* <td>IBM870</td>
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* <td>ebcdic-cp-roece ebcdic-cp-yu csIBM870 </td>
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* </tr>
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* <tr>
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* <td>Cp871</td>
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* <td>IBM871</td>
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* <td>ebcdic-cp-is csIBM871 </td>
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* </tr>
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* <tr>
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* <td>Cp875</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp918</td>
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* <td>IBM918</td>
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* <td>ebcdic-cp-ar2 csIBM918 </td>
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* </tr>
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* <tr>
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* <td>Cp921</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp922</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp930</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp933</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp935</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp937</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp939</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp942</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp942C</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp943</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp943C</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp948</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp949</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp949C</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp950</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp964</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>Cp970</td>
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* <td>?</td>
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* <td></td>
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* </tr>
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* <tr>
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* <td>EUC_CN</td>
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* <td>GB2312</td>
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* <td>x-EUC-CN csGB2312 euccn euc-cn gb2312-80 gb2312-1980 CN-GB CN-GB-ISOIR165 </td>
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* </tr>
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* <tr>
|
|
* <td>EUC_JP</td>
|
|
* <td>EUC-JP</td>
|
|
* <td>csEUCPkdFmtJapanese Extended_UNIX_Code_Packed_Format_for_Japanese eucjis x-eucjp eucjp x-euc-jp </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>EUC_JP_LINUX</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>EUC_JP_Solaris</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>EUC_KR</td>
|
|
* <td>EUC-KR</td>
|
|
* <td>csEUCKR ksc5601 5601 ksc5601_1987 ksc_5601 ksc5601-1987 ks_c_5601-1987 euckr </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>EUC_TW</td>
|
|
* <td>EUC-TW</td>
|
|
* <td>x-EUC-TW cns11643 euctw </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>GB18030</td>
|
|
* <td>GB18030</td>
|
|
* <td>gb18030-2000 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>GBK</td>
|
|
* <td>windows-936</td>
|
|
* <td>CP936 MS936 ms_936 x-mswin-936 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISCII91</td>
|
|
* <td>?</td>
|
|
* <td>x-ISCII91 iscii </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO2022CN</td>
|
|
* <td>ISO-2022-CN</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO2022JP</td>
|
|
* <td>ISO-2022-JP</td>
|
|
* <td>csISO2022JP JIS jis_encoding csjisencoding </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO2022KR</td>
|
|
* <td>ISO-2022-KR</td>
|
|
* <td>csISO2022KR </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO2022_CN_CNS</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO2022_CN_GB</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_1</td>
|
|
* <td>ISO-8859-1</td>
|
|
* <td>ISO_8859-1:1987 iso-ir-100 ISO_8859-1 latin1 l1 IBM819 CP819 csISOLatin1 8859_1 819 IBM-819 ISO8859-1 ISO_8859_1 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_13</td>
|
|
* <td>ISO-8859-13</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_15</td>
|
|
* <td>ISO-8859-15</td>
|
|
* <td>ISO_8859-15 Latin-9 8859_15 csISOlatin9 IBM923 cp923 923 L9 IBM-923 ISO8859-15 LATIN9 LATIN0 csISOlatin0 ISO8859_15_FDIS </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_2</td>
|
|
* <td>ISO-8859-2</td>
|
|
* <td>ISO_8859-2:1987 iso-ir-101 ISO_8859-2 latin2 l2 csISOLatin2 8859_2 iso8859_2 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_3</td>
|
|
* <td>ISO-8859-3</td>
|
|
* <td>ISO_8859-3:1988 iso-ir-109 ISO_8859-3 latin3 l3 csISOLatin3 8859_3 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_4</td>
|
|
* <td>ISO-8859-4</td>
|
|
* <td>ISO_8859-4:1988 iso-ir-110 ISO_8859-4 latin4 l4 csISOLatin4 8859_4 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_5</td>
|
|
* <td>ISO-8859-5</td>
|
|
* <td>ISO_8859-5:1988 iso-ir-144 ISO_8859-5 cyrillic csISOLatinCyrillic 8859_5 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_6</td>
|
|
* <td>ISO-8859-6</td>
|
|
* <td>ISO_8859-6:1987 iso-ir-127 ISO_8859-6 ECMA-114 ASMO-708 arabic csISOLatinArabic 8859_6 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_7</td>
|
|
* <td>ISO-8859-7</td>
|
|
* <td>ISO_8859-7:1987 iso-ir-126 ISO_8859-7 ELOT_928 ECMA-118 greek greek8 csISOLatinGreek 8859_7 sun_eu_greek </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_8</td>
|
|
* <td>ISO-8859-8</td>
|
|
* <td>ISO_8859-8:1988 iso-ir-138 ISO_8859-8 hebrew csISOLatinHebrew 8859_8 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>ISO8859_9</td>
|
|
* <td>ISO-8859-9</td>
|
|
* <td>ISO_8859-9:1989 iso-ir-148 ISO_8859-9 latin5 l5 csISOLatin5 8859_9 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>JISAutoDetect</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>JIS_C6626-1983</td>
|
|
* <td>JIS_C6626-1983</td>
|
|
* <td>x-JIS0208 JIS0208 csISO87JISX0208 x0208 JIS_X0208-1983 iso-ir-87 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>JIS_X0201</td>
|
|
* <td>JIS_X0201</td>
|
|
* <td>X0201 JIS0201 csHalfWidthKatakana </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>JIS_X0212-1990</td>
|
|
* <td>JIS_X0212-1990</td>
|
|
* <td>iso-ir-159 x0212 JIS0212 csISO159JISX02121990 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>KOI8_R</td>
|
|
* <td>KOI8-R</td>
|
|
* <td>csKOI8R koi8 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MS874</td>
|
|
* <td>windows-874</td>
|
|
* <td>cp874 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MS932</td>
|
|
* <td>Windows-31J</td>
|
|
* <td>windows-932 csWindows31J x-ms-cp932 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MS949</td>
|
|
* <td>windows-949</td>
|
|
* <td>windows949 ms_949 x-windows-949 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MS950</td>
|
|
* <td>windows-950</td>
|
|
* <td>x-windows-950 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MS950_HKSCS</td>
|
|
* <td></td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacArabic</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacCentralEurope</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacCroatian</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacCyrillic</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacDingbat</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacGreek</td>
|
|
* <td>MacGreek</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacHebrew</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacIceland</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacRoman</td>
|
|
* <td>MacRoman</td>
|
|
* <td>Macintosh MAC csMacintosh </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacRomania</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacSymbol</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacThai</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacTurkish</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>MacUkraine</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>SJIS</td>
|
|
* <td>Shift_JIS</td>
|
|
* <td>MS_Kanji csShiftJIS shift-jis x-sjis pck </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>TIS620</td>
|
|
* <td>TIS-620</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>UTF-16</td>
|
|
* <td>UTF-16</td>
|
|
* <td>UTF_16 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>UTF8</td>
|
|
* <td>UTF-8</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>UnicodeBig</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>UnicodeBigUnmarked</td>
|
|
* <td>UTF-16BE</td>
|
|
* <td>X-UTF-16BE UTF_16BE ISO-10646-UCS-2 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>UnicodeLittle</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>UnicodeLittleUnmarked</td>
|
|
* <td>UTF-16LE</td>
|
|
* <td>UTF_16LE X-UTF-16LE </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>x-Johab</td>
|
|
* <td>johab</td>
|
|
* <td>johab cp1361 ms1361 ksc5601-1992 ksc5601_1992 </td>
|
|
* </tr>
|
|
* <tr>
|
|
* <td>x-iso-8859-11</td>
|
|
* <td>?</td>
|
|
* <td></td>
|
|
* </tr>
|
|
* </table>
|
|
*
|
|
*
|
|
* @version $Id: CharsetUtil.java,v 1.1 2004/10/25 07:26:46 ntherning Exp $
|
|
*/
|
|
public class CharsetUtil {
|
|
private static Log log = LogFactory.getLog(CharsetUtil.class);
|
|
|
|
private static class Charset implements Comparable {
|
|
private String canonical = null;
|
|
private String mime = null;
|
|
private String[] aliases = null;
|
|
|
|
private Charset(String canonical, String mime, String[] aliases) {
|
|
this.canonical = canonical;
|
|
this.mime = mime;
|
|
this.aliases = aliases;
|
|
}
|
|
|
|
public int compareTo(Object o) {
|
|
Charset c = (Charset) o;
|
|
return this.canonical.compareTo(c.canonical);
|
|
}
|
|
}
|
|
|
|
private static Charset[] JAVA_CHARSETS = {
|
|
new Charset("ISO8859_1", "ISO-8859-1",
|
|
new String[] {"ISO_8859-1:1987", "iso-ir-100", "ISO_8859-1",
|
|
"latin1", "l1", "IBM819", "CP819",
|
|
"csISOLatin1", "8859_1", "819", "IBM-819",
|
|
"ISO8859-1", "ISO_8859_1"}),
|
|
new Charset("ISO8859_2", "ISO-8859-2",
|
|
new String[] {"ISO_8859-2:1987", "iso-ir-101", "ISO_8859-2",
|
|
"latin2", "l2", "csISOLatin2", "8859_2",
|
|
"iso8859_2"}),
|
|
new Charset("ISO8859_3", "ISO-8859-3", new String[] {"ISO_8859-3:1988", "iso-ir-109", "ISO_8859-3", "latin3", "l3", "csISOLatin3", "8859_3"}),
|
|
new Charset("ISO8859_4", "ISO-8859-4",
|
|
new String[] {"ISO_8859-4:1988", "iso-ir-110", "ISO_8859-4",
|
|
"latin4", "l4", "csISOLatin4", "8859_4"}),
|
|
new Charset("ISO8859_5", "ISO-8859-5",
|
|
new String[] {"ISO_8859-5:1988", "iso-ir-144", "ISO_8859-5",
|
|
"cyrillic", "csISOLatinCyrillic", "8859_5"}),
|
|
new Charset("ISO8859_6", "ISO-8859-6", new String[] {"ISO_8859-6:1987", "iso-ir-127", "ISO_8859-6", "ECMA-114", "ASMO-708", "arabic", "csISOLatinArabic", "8859_6"}),
|
|
new Charset("ISO8859_7", "ISO-8859-7",
|
|
new String[] {"ISO_8859-7:1987", "iso-ir-126", "ISO_8859-7",
|
|
"ELOT_928", "ECMA-118", "greek", "greek8",
|
|
"csISOLatinGreek", "8859_7", "sun_eu_greek"}),
|
|
new Charset("ISO8859_8", "ISO-8859-8", new String[] {"ISO_8859-8:1988", "iso-ir-138", "ISO_8859-8", "hebrew", "csISOLatinHebrew", "8859_8"}),
|
|
new Charset("ISO8859_9", "ISO-8859-9",
|
|
new String[] {"ISO_8859-9:1989", "iso-ir-148", "ISO_8859-9",
|
|
"latin5", "l5", "csISOLatin5", "8859_9"}),
|
|
|
|
new Charset("ISO8859_13", "ISO-8859-13", new String[] {}),
|
|
new Charset("ISO8859_15", "ISO-8859-15",
|
|
new String[] {"ISO_8859-15", "Latin-9", "8859_15",
|
|
"csISOlatin9", "IBM923", "cp923", "923", "L9",
|
|
"IBM-923", "ISO8859-15", "LATIN9", "LATIN0",
|
|
"csISOlatin0", "ISO8859_15_FDIS"}),
|
|
new Charset("KOI8_R", "KOI8-R", new String[] {"csKOI8R", "koi8"}),
|
|
new Charset("ASCII", "US-ASCII",
|
|
new String[] {"ANSI_X3.4-1968", "iso-ir-6",
|
|
"ANSI_X3.4-1986", "ISO_646.irv:1991",
|
|
"ISO646-US", "us", "IBM367", "cp367",
|
|
"csASCII", "ascii7", "646", "iso_646.irv:1983"}),
|
|
new Charset("UTF8", "UTF-8", new String[] {}),
|
|
new Charset("UTF-16", "UTF-16", new String[] {"UTF_16"}),
|
|
new Charset("UnicodeBigUnmarked", "UTF-16BE", new String[] {"X-UTF-16BE", "UTF_16BE", "ISO-10646-UCS-2"}),
|
|
new Charset("UnicodeLittleUnmarked", "UTF-16LE", new String[] {"UTF_16LE", "X-UTF-16LE"}),
|
|
new Charset("Big5", "Big5", new String[] {"csBig5", "CN-Big5", "BIG-FIVE", "BIGFIVE"}),
|
|
new Charset("Big5_HKSCS", "Big5-HKSCS", new String[] {"big5hkscs"}),
|
|
new Charset("EUC_JP", "EUC-JP",
|
|
new String[] {"csEUCPkdFmtJapanese",
|
|
"Extended_UNIX_Code_Packed_Format_for_Japanese",
|
|
"eucjis", "x-eucjp", "eucjp", "x-euc-jp"}),
|
|
new Charset("EUC_KR", "EUC-KR",
|
|
new String[] {"csEUCKR", "ksc5601", "5601", "ksc5601_1987",
|
|
"ksc_5601", "ksc5601-1987", "ks_c_5601-1987",
|
|
"euckr"}),
|
|
new Charset("GB18030", "GB18030", new String[] {"gb18030-2000"}),
|
|
new Charset("EUC_CN", "GB2312", new String[] {"x-EUC-CN", "csGB2312", "euccn", "euc-cn", "gb2312-80", "gb2312-1980", "CN-GB", "CN-GB-ISOIR165"}),
|
|
new Charset("GBK", "windows-936", new String[] {"CP936", "MS936", "ms_936", "x-mswin-936"}),
|
|
|
|
new Charset("Cp037", "IBM037", new String[] {"ebcdic-cp-us", "ebcdic-cp-ca", "ebcdic-cp-wt", "ebcdic-cp-nl", "csIBM037"}),
|
|
new Charset("Cp273", "IBM273", new String[] {"csIBM273"}),
|
|
new Charset("Cp277", "IBM277", new String[] {"EBCDIC-CP-DK", "EBCDIC-CP-NO", "csIBM277"}),
|
|
new Charset("Cp278", "IBM278", new String[] {"CP278", "ebcdic-cp-fi", "ebcdic-cp-se", "csIBM278"}),
|
|
new Charset("Cp280", "IBM280", new String[] {"ebcdic-cp-it", "csIBM280"}),
|
|
new Charset("Cp284", "IBM284", new String[] {"ebcdic-cp-es", "csIBM284"}),
|
|
new Charset("Cp285", "IBM285", new String[] {"ebcdic-cp-gb", "csIBM285"}),
|
|
new Charset("Cp297", "IBM297", new String[] {"ebcdic-cp-fr", "csIBM297"}),
|
|
new Charset("Cp420", "IBM420", new String[] {"ebcdic-cp-ar1", "csIBM420"}),
|
|
new Charset("Cp424", "IBM424", new String[] {"ebcdic-cp-he", "csIBM424"}),
|
|
new Charset("Cp437", "IBM437", new String[] {"437", "csPC8CodePage437"}),
|
|
new Charset("Cp500", "IBM500", new String[] {"ebcdic-cp-be", "ebcdic-cp-ch", "csIBM500"}),
|
|
new Charset("Cp775", "IBM775", new String[] {"csPC775Baltic"}),
|
|
new Charset("Cp838", "IBM-Thai", new String[] {}),
|
|
new Charset("Cp850", "IBM850", new String[] {"850", "csPC850Multilingual"}),
|
|
new Charset("Cp852", "IBM852", new String[] {"852", "csPCp852"}),
|
|
new Charset("Cp855", "IBM855", new String[] {"855", "csIBM855"}),
|
|
new Charset("Cp857", "IBM857", new String[] {"857", "csIBM857"}),
|
|
new Charset("Cp858", "IBM00858",
|
|
new String[] {"CCSID00858", "CP00858",
|
|
"PC-Multilingual-850+euro"}),
|
|
new Charset("Cp860", "IBM860", new String[] {"860", "csIBM860"}),
|
|
new Charset("Cp861", "IBM861", new String[] {"861", "cp-is", "csIBM861"}),
|
|
new Charset("Cp862", "IBM862", new String[] {"862", "csPC862LatinHebrew"}),
|
|
new Charset("Cp863", "IBM863", new String[] {"863", "csIBM863"}),
|
|
new Charset("Cp864", "IBM864", new String[] {"cp864", "csIBM864"}),
|
|
new Charset("Cp865", "IBM865", new String[] {"865", "csIBM865"}),
|
|
new Charset("Cp866", "IBM866", new String[] {"866", "csIBM866"}),
|
|
new Charset("Cp868", "IBM868", new String[] {"cp-ar", "csIBM868"}),
|
|
new Charset("Cp869", "IBM869", new String[] {"cp-gr", "csIBM869"}),
|
|
new Charset("Cp870", "IBM870", new String[] {"ebcdic-cp-roece", "ebcdic-cp-yu", "csIBM870"}),
|
|
new Charset("Cp871", "IBM871", new String[] {"ebcdic-cp-is", "csIBM871"}),
|
|
new Charset("Cp918", "IBM918", new String[] {"ebcdic-cp-ar2", "csIBM918"}),
|
|
new Charset("Cp1026", "IBM1026", new String[] {"csIBM1026"}),
|
|
new Charset("Cp1047", "IBM1047", new String[] {"IBM-1047"}),
|
|
new Charset("Cp1140", "IBM01140",
|
|
new String[] {"CCSID01140", "CP01140",
|
|
"ebcdic-us-37+euro"}),
|
|
new Charset("Cp1141", "IBM01141",
|
|
new String[] {"CCSID01141", "CP01141",
|
|
"ebcdic-de-273+euro"}),
|
|
new Charset("Cp1142", "IBM01142", new String[] {"CCSID01142", "CP01142", "ebcdic-dk-277+euro", "ebcdic-no-277+euro"}),
|
|
new Charset("Cp1143", "IBM01143", new String[] {"CCSID01143", "CP01143", "ebcdic-fi-278+euro", "ebcdic-se-278+euro"}),
|
|
new Charset("Cp1144", "IBM01144", new String[] {"CCSID01144", "CP01144", "ebcdic-it-280+euro"}),
|
|
new Charset("Cp1145", "IBM01145", new String[] {"CCSID01145", "CP01145", "ebcdic-es-284+euro"}),
|
|
new Charset("Cp1146", "IBM01146", new String[] {"CCSID01146", "CP01146", "ebcdic-gb-285+euro"}),
|
|
new Charset("Cp1147", "IBM01147", new String[] {"CCSID01147", "CP01147", "ebcdic-fr-297+euro"}),
|
|
new Charset("Cp1148", "IBM01148", new String[] {"CCSID01148", "CP01148", "ebcdic-international-500+euro"}),
|
|
new Charset("Cp1149", "IBM01149", new String[] {"CCSID01149", "CP01149", "ebcdic-is-871+euro"}),
|
|
new Charset("Cp1250", "windows-1250", new String[] {}),
|
|
new Charset("Cp1251", "windows-1251", new String[] {}),
|
|
new Charset("Cp1252", "windows-1252", new String[] {}),
|
|
new Charset("Cp1253", "windows-1253", new String[] {}),
|
|
new Charset("Cp1254", "windows-1254", new String[] {}),
|
|
new Charset("Cp1255", "windows-1255", new String[] {}),
|
|
new Charset("Cp1256", "windows-1256", new String[] {}),
|
|
new Charset("Cp1257", "windows-1257", new String[] {}),
|
|
new Charset("Cp1258", "windows-1258", new String[] {}),
|
|
new Charset("ISO2022CN", "ISO-2022-CN", new String[] {}),
|
|
new Charset("ISO2022JP", "ISO-2022-JP", new String[] {"csISO2022JP", "JIS", "jis_encoding", "csjisencoding"}),
|
|
new Charset("ISO2022KR", "ISO-2022-KR", new String[] {"csISO2022KR"}),
|
|
new Charset("JIS_X0201", "JIS_X0201", new String[] {"X0201", "JIS0201", "csHalfWidthKatakana"}),
|
|
new Charset("JIS_X0212-1990", "JIS_X0212-1990", new String[] {"iso-ir-159", "x0212", "JIS0212", "csISO159JISX02121990"}),
|
|
new Charset("JIS_C6626-1983", "JIS_C6626-1983", new String[] {"x-JIS0208", "JIS0208", "csISO87JISX0208", "x0208", "JIS_X0208-1983", "iso-ir-87"}),
|
|
new Charset("SJIS", "Shift_JIS", new String[] {"MS_Kanji", "csShiftJIS", "shift-jis", "x-sjis", "pck"}),
|
|
new Charset("TIS620", "TIS-620", new String[] {}),
|
|
new Charset("MS932", "Windows-31J", new String[] {"windows-932", "csWindows31J", "x-ms-cp932"}),
|
|
new Charset("EUC_TW", "EUC-TW", new String[] {"x-EUC-TW", "cns11643", "euctw"}),
|
|
new Charset("x-Johab", "johab", new String[] {"johab", "cp1361", "ms1361", "ksc5601-1992", "ksc5601_1992"}),
|
|
new Charset("MS950_HKSCS", "", new String[] {}),
|
|
new Charset("MS874", "windows-874", new String[] {"cp874"}),
|
|
new Charset("MS949", "windows-949", new String[] {"windows949", "ms_949", "x-windows-949"}),
|
|
new Charset("MS950", "windows-950", new String[] {"x-windows-950"}),
|
|
|
|
new Charset("Cp737", null, new String[] {}),
|
|
new Charset("Cp856", null, new String[] {}),
|
|
new Charset("Cp875", null, new String[] {}),
|
|
new Charset("Cp921", null, new String[] {}),
|
|
new Charset("Cp922", null, new String[] {}),
|
|
new Charset("Cp930", null, new String[] {}),
|
|
new Charset("Cp933", null, new String[] {}),
|
|
new Charset("Cp935", null, new String[] {}),
|
|
new Charset("Cp937", null, new String[] {}),
|
|
new Charset("Cp939", null, new String[] {}),
|
|
new Charset("Cp942", null, new String[] {}),
|
|
new Charset("Cp942C", null, new String[] {}),
|
|
new Charset("Cp943", null, new String[] {}),
|
|
new Charset("Cp943C", null, new String[] {}),
|
|
new Charset("Cp948", null, new String[] {}),
|
|
new Charset("Cp949", null, new String[] {}),
|
|
new Charset("Cp949C", null, new String[] {}),
|
|
new Charset("Cp950", null, new String[] {}),
|
|
new Charset("Cp964", null, new String[] {}),
|
|
new Charset("Cp970", null, new String[] {}),
|
|
new Charset("Cp1006", null, new String[] {}),
|
|
new Charset("Cp1025", null, new String[] {}),
|
|
new Charset("Cp1046", null, new String[] {}),
|
|
new Charset("Cp1097", null, new String[] {}),
|
|
new Charset("Cp1098", null, new String[] {}),
|
|
new Charset("Cp1112", null, new String[] {}),
|
|
new Charset("Cp1122", null, new String[] {}),
|
|
new Charset("Cp1123", null, new String[] {}),
|
|
new Charset("Cp1124", null, new String[] {}),
|
|
new Charset("Cp1381", null, new String[] {}),
|
|
new Charset("Cp1383", null, new String[] {}),
|
|
new Charset("Cp33722", null, new String[] {}),
|
|
new Charset("Big5_Solaris", null, new String[] {}),
|
|
new Charset("EUC_JP_LINUX", null, new String[] {}),
|
|
new Charset("EUC_JP_Solaris", null, new String[] {}),
|
|
new Charset("ISCII91", null, new String[] {"x-ISCII91", "iscii"}),
|
|
new Charset("ISO2022_CN_CNS", null, new String[] {}),
|
|
new Charset("ISO2022_CN_GB", null, new String[] {}),
|
|
new Charset("x-iso-8859-11", null, new String[] {}),
|
|
new Charset("JISAutoDetect", null, new String[] {}),
|
|
new Charset("MacArabic", null, new String[] {}),
|
|
new Charset("MacCentralEurope", null, new String[] {}),
|
|
new Charset("MacCroatian", null, new String[] {}),
|
|
new Charset("MacCyrillic", null, new String[] {}),
|
|
new Charset("MacDingbat", null, new String[] {}),
|
|
new Charset("MacGreek", "MacGreek", new String[] {}),
|
|
new Charset("MacHebrew", null, new String[] {}),
|
|
new Charset("MacIceland", null, new String[] {}),
|
|
new Charset("MacRoman", "MacRoman", new String[] {"Macintosh", "MAC", "csMacintosh"}),
|
|
new Charset("MacRomania", null, new String[] {}),
|
|
new Charset("MacSymbol", null, new String[] {}),
|
|
new Charset("MacThai", null, new String[] {}),
|
|
new Charset("MacTurkish", null, new String[] {}),
|
|
new Charset("MacUkraine", null, new String[] {}),
|
|
new Charset("UnicodeBig", null, new String[] {}),
|
|
new Charset("UnicodeLittle", null, new String[] {})
|
|
};
|
|
|
|
/**
|
|
* Contains the canonical names of character sets which can be used to
|
|
* decode bytes into Java chars.
|
|
*/
|
|
private static TreeSet decodingSupported = null;
|
|
|
|
/**
|
|
* Contains the canonical names of character sets which can be used to
|
|
* encode Java chars into bytes.
|
|
*/
|
|
private static TreeSet encodingSupported = null;
|
|
|
|
/**
|
|
* Maps character set names to Charset objects. All possible names of
|
|
* a charset will be mapped to the Charset.
|
|
*/
|
|
private static HashMap charsetMap = null;
|
|
|
|
static {
|
|
decodingSupported = new TreeSet();
|
|
encodingSupported = new TreeSet();
|
|
byte[] dummy = new byte[] {'d', 'u', 'm', 'm', 'y'};
|
|
for (int i = 0; i < JAVA_CHARSETS.length; i++) {
|
|
try {
|
|
String s = new String(dummy, JAVA_CHARSETS[i].canonical);
|
|
decodingSupported.add(JAVA_CHARSETS[i].canonical.toLowerCase());
|
|
} catch (UnsupportedOperationException e) {
|
|
} catch (UnsupportedEncodingException e) {
|
|
}
|
|
try {
|
|
"dummy".getBytes(JAVA_CHARSETS[i].canonical);
|
|
encodingSupported.add(JAVA_CHARSETS[i].canonical.toLowerCase());
|
|
} catch (UnsupportedOperationException e) {
|
|
} catch (UnsupportedEncodingException e) {
|
|
}
|
|
}
|
|
|
|
charsetMap = new HashMap();
|
|
for (int i = 0; i < JAVA_CHARSETS.length; i++) {
|
|
Charset c = JAVA_CHARSETS[i];
|
|
charsetMap.put(c.canonical.toLowerCase(), c);
|
|
if (c.mime != null) {
|
|
charsetMap.put(c.mime.toLowerCase(), c);
|
|
}
|
|
if (c.aliases != null) {
|
|
for (int j = 0; j < c.aliases.length; j++) {
|
|
charsetMap.put(c.aliases[j].toLowerCase(), c);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (log.isDebugEnabled()) {
|
|
log.debug("Character sets which support decoding: "
|
|
+ decodingSupported);
|
|
log.debug("Character sets which support encoding: "
|
|
+ encodingSupported);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ANDROID: THE FOLLOWING SET OF STATIC STRINGS ARE COPIED FROM A NEWER VERSION OF MIME4J
|
|
*/
|
|
|
|
/** carriage return - line feed sequence */
|
|
public static final String CRLF = "\r\n";
|
|
|
|
/** US-ASCII CR, carriage return (13) */
|
|
public static final int CR = '\r';
|
|
|
|
/** US-ASCII LF, line feed (10) */
|
|
public static final int LF = '\n';
|
|
|
|
/** US-ASCII SP, space (32) */
|
|
public static final int SP = ' ';
|
|
|
|
/** US-ASCII HT, horizontal-tab (9)*/
|
|
public static final int HT = '\t';
|
|
|
|
public static final java.nio.charset.Charset US_ASCII = java.nio.charset.Charset
|
|
.forName("US-ASCII");
|
|
|
|
public static final java.nio.charset.Charset ISO_8859_1 = java.nio.charset.Charset
|
|
.forName("ISO-8859-1");
|
|
|
|
public static final java.nio.charset.Charset UTF_8 = java.nio.charset.Charset
|
|
.forName("UTF-8");
|
|
|
|
/**
|
|
* Returns <code>true</code> if the specified character is a whitespace
|
|
* character (CR, LF, SP or HT).
|
|
*
|
|
* ANDROID: COPIED FROM A NEWER VERSION OF MIME4J
|
|
*
|
|
* @param ch
|
|
* character to test.
|
|
* @return <code>true</code> if the specified character is a whitespace
|
|
* character, <code>false</code> otherwise.
|
|
*/
|
|
public static boolean isWhitespace(char ch) {
|
|
return ch == SP || ch == HT || ch == CR || ch == LF;
|
|
}
|
|
|
|
/**
|
|
* Returns <code>true</code> if the specified string consists entirely of
|
|
* whitespace characters.
|
|
*
|
|
* ANDROID: COPIED FROM A NEWER VERSION OF MIME4J
|
|
*
|
|
* @param s
|
|
* string to test.
|
|
* @return <code>true</code> if the specified string consists entirely of
|
|
* whitespace characters, <code>false</code> otherwise.
|
|
*/
|
|
public static boolean isWhitespace(final String s) {
|
|
if (s == null) {
|
|
throw new IllegalArgumentException("String may not be null");
|
|
}
|
|
final int len = s.length();
|
|
for (int i = 0; i < len; i++) {
|
|
if (!isWhitespace(s.charAt(i))) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Determines if the VM supports encoding (chars to bytes) the
|
|
* specified character set. NOTE: the given character set name may
|
|
* not be known to the VM even if this method returns <code>true</code>.
|
|
* Use {@link #toJavaCharset(String)} to get the canonical Java character
|
|
* set name.
|
|
*
|
|
* @param charsetName the characters set name.
|
|
* @return <code>true</code> if encoding is supported, <code>false</code>
|
|
* otherwise.
|
|
*/
|
|
public static boolean isEncodingSupported(String charsetName) {
|
|
return encodingSupported.contains(charsetName.toLowerCase());
|
|
}
|
|
|
|
/**
|
|
* Determines if the VM supports decoding (bytes to chars) the
|
|
* specified character set. NOTE: the given character set name may
|
|
* not be known to the VM even if this method returns <code>true</code>.
|
|
* Use {@link #toJavaCharset(String)} to get the canonical Java character
|
|
* set name.
|
|
*
|
|
* @param charsetName the characters set name.
|
|
* @return <code>true</code> if decoding is supported, <code>false</code>
|
|
* otherwise.
|
|
*/
|
|
public static boolean isDecodingSupported(String charsetName) {
|
|
return decodingSupported.contains(charsetName.toLowerCase());
|
|
}
|
|
|
|
/**
|
|
* Gets the preferred MIME character set name for the specified
|
|
* character set or <code>null</code> if not known.
|
|
*
|
|
* @param charsetName the character set name to look for.
|
|
* @return the MIME preferred name or <code>null</code> if not known.
|
|
*/
|
|
public static String toMimeCharset(String charsetName) {
|
|
Charset c = (Charset) charsetMap.get(charsetName.toLowerCase());
|
|
if (c != null) {
|
|
return c.mime;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Gets the canonical Java character set name for the specified
|
|
* character set or <code>null</code> if not known. This should be
|
|
* called before doing any conversions using the Java API. NOTE:
|
|
* you must use {@link #isEncodingSupported(String)} or
|
|
* {@link #isDecodingSupported(String)} to make sure the returned
|
|
* Java character set is supported by the current VM.
|
|
*
|
|
* @param charsetName the character set name to look for.
|
|
* @return the canonical Java name or <code>null</code> if not known.
|
|
*/
|
|
public static String toJavaCharset(String charsetName) {
|
|
Charset c = (Charset) charsetMap.get(charsetName.toLowerCase());
|
|
if (c != null) {
|
|
return c.canonical;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public static java.nio.charset.Charset getCharset(String charsetName) {
|
|
String defaultCharset = "ISO-8859-1";
|
|
|
|
// Use the default chareset if given charset is null
|
|
if(charsetName == null) charsetName = defaultCharset;
|
|
|
|
try {
|
|
return java.nio.charset.Charset.forName(charsetName);
|
|
} catch (IllegalCharsetNameException e) {
|
|
log.info("Illegal charset " + charsetName + ", fallback to " + defaultCharset + ": " + e);
|
|
// Use default charset on exception
|
|
return java.nio.charset.Charset.forName(defaultCharset);
|
|
} catch (UnsupportedCharsetException ex) {
|
|
log.info("Unsupported charset " + charsetName + ", fallback to " + defaultCharset + ": " + ex);
|
|
// Use default charset on exception
|
|
return java.nio.charset.Charset.forName(defaultCharset);
|
|
}
|
|
|
|
}
|
|
/*
|
|
* Uncomment the code below and run the main method to regenerate the
|
|
* Javadoc table above when the known charsets change.
|
|
*/
|
|
|
|
/*
|
|
private static String dumpHtmlTable() {
|
|
LinkedList l = new LinkedList(Arrays.asList(JAVA_CHARSETS));
|
|
Collections.sort(l);
|
|
StringBuffer sb = new StringBuffer();
|
|
sb.append(" * <table>\n");
|
|
sb.append(" * <tr>\n");
|
|
sb.append(" * <td>Canonical (Java) name</td>\n");
|
|
sb.append(" * <td>MIME preferred</td>\n");
|
|
sb.append(" * <td>Aliases</td>\n");
|
|
sb.append(" * </tr>\n");
|
|
|
|
for (Iterator it = l.iterator(); it.hasNext();) {
|
|
Charset c = (Charset) it.next();
|
|
sb.append(" * <tr>\n");
|
|
sb.append(" * <td>" + c.canonical + "</td>\n");
|
|
sb.append(" * <td>" + (c.mime == null ? "?" : c.mime)+ "</td>\n");
|
|
sb.append(" * <td>");
|
|
for (int i = 0; c.aliases != null && i < c.aliases.length; i++) {
|
|
sb.append(c.aliases[i] + " ");
|
|
}
|
|
sb.append("</td>\n");
|
|
sb.append(" * </tr>\n");
|
|
}
|
|
sb.append(" * </table>\n");
|
|
return sb.toString();
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
System.out.println(dumpHtmlTable());
|
|
}*/
|
|
}
|