mirror of https://github.com/M66B/FairEmail.git
107 lines
3.8 KiB
Java
107 lines
3.8 KiB
Java
package eu.faircode.email;
|
|
|
|
/*
|
|
This file is part of FairEmail.
|
|
FairEmail 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, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
FairEmail 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 FairEmail. If not, see <http://www.gnu.org/licenses/>.
|
|
Copyright 2018-2022 by Marcel Bokhorst (M66B)
|
|
*/
|
|
|
|
import android.text.TextUtils;
|
|
|
|
import java.nio.charset.Charset;
|
|
import java.nio.charset.StandardCharsets;
|
|
import java.nio.charset.spi.CharsetProvider;
|
|
import java.text.Normalizer;
|
|
import java.util.Collections;
|
|
import java.util.Iterator;
|
|
|
|
import javax.mail.internet.MimeUtility;
|
|
|
|
public class UnknownCharsetProvider extends CharsetProvider {
|
|
@Override
|
|
public Iterator<Charset> charsets() {
|
|
return Collections.emptyIterator();
|
|
}
|
|
|
|
@Override
|
|
public Charset charsetForName(String name) {
|
|
try {
|
|
Charset charset = charsetForMime(name);
|
|
return (charset == null ? StandardCharsets.ISO_8859_1 : charset);
|
|
} catch (Throwable ex) {
|
|
Log.e(ex);
|
|
return StandardCharsets.ISO_8859_1;
|
|
}
|
|
}
|
|
|
|
public static Charset charsetForMime(String name) {
|
|
// x-binaryenc
|
|
// UseInqueCodePage
|
|
// ISO3166-1
|
|
// EUCGB2312_CN
|
|
// WE8MSWIN1252
|
|
// https://javaee.github.io/javamail/FAQ#unsupen
|
|
// https://github.com/javaee/javamail/blob/master/mail/src/main/resources/META-INF/javamail.charset.map
|
|
try {
|
|
if (name == null)
|
|
name = "";
|
|
|
|
name = name.replace("\"", "");
|
|
|
|
int sp = name.indexOf(" ");
|
|
if (sp > 0)
|
|
name = name.substring(0, sp);
|
|
|
|
// WİNDOWS-1254
|
|
name = Normalizer.normalize(name, Normalizer.Form.NFKD)
|
|
.replaceAll("[^\\p{ASCII}]", "");
|
|
|
|
name = name.trim().toUpperCase();
|
|
|
|
if (name.contains("UTF8") || name.contains("UTF-8")) // //TRANSLIT
|
|
return StandardCharsets.UTF_8;
|
|
|
|
// https://charset-normalizer.readthedocs.io/en/latest/support.html
|
|
if (name.contains("GB2312"))
|
|
name = "GB2312";
|
|
|
|
if (TextUtils.isEmpty(name) ||
|
|
name.contains("ASCII") ||
|
|
//name.startsWith("ISO8859") ||
|
|
//name.startsWith("ISO-8859") ||
|
|
//name.startsWith("WINDOWS-1252") ||
|
|
//name.startsWith("WINDOWS-1254") ||
|
|
"x-IA5".equalsIgnoreCase(name) ||
|
|
"BASE64".equalsIgnoreCase(name) ||
|
|
"ISO".equalsIgnoreCase(name) ||
|
|
"latin".equalsIgnoreCase(name) ||
|
|
"NONE".equalsIgnoreCase(name) ||
|
|
"CHARSET".equalsIgnoreCase(name) ||
|
|
"UNKNOWN".equalsIgnoreCase(name) ||
|
|
"X-UNKNOWN".equalsIgnoreCase(name) ||
|
|
"8bit".equalsIgnoreCase(name) ||
|
|
"unknown-8bit".equalsIgnoreCase(name))
|
|
return StandardCharsets.ISO_8859_1;
|
|
|
|
if (name.contains("1252"))
|
|
name = "windows-1252";
|
|
|
|
// Android will prevent recursion
|
|
String jname = MimeUtility.javaCharset(name);
|
|
return Charset.forName(jname);
|
|
} catch (Throwable ex) {
|
|
Log.e("Unknown charset " + name, ex);
|
|
return null;
|
|
}
|
|
}
|
|
}
|