mirror of https://github.com/M66B/FairEmail.git
107 lines
3.8 KiB
Java
107 lines
3.8 KiB
Java
package eu.faircode.email;
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/*
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This file is part of FairEmail.
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FairEmail is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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FairEmail is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FairEmail. If not, see <http://www.gnu.org/licenses/>.
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Copyright 2018-2023 by Marcel Bokhorst (M66B)
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*/
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import android.text.TextUtils;
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import java.nio.charset.Charset;
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import java.nio.charset.StandardCharsets;
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import java.nio.charset.spi.CharsetProvider;
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import java.text.Normalizer;
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import java.util.Collections;
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import java.util.Iterator;
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import javax.mail.internet.MimeUtility;
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public class UnknownCharsetProvider extends CharsetProvider {
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@Override
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public Iterator<Charset> charsets() {
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return Collections.emptyIterator();
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}
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@Override
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public Charset charsetForName(String name) {
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try {
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Charset charset = charsetForMime(name);
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return (charset == null ? StandardCharsets.ISO_8859_1 : charset);
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} catch (Throwable ex) {
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Log.e(ex);
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return StandardCharsets.ISO_8859_1;
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}
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}
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public static Charset charsetForMime(String name) {
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// x-binaryenc
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// UseInqueCodePage
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// ISO3166-1
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// EUCGB2312_CN
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// WE8MSWIN1252
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// https://javaee.github.io/javamail/FAQ#unsupen
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// https://github.com/javaee/javamail/blob/master/mail/src/main/resources/META-INF/javamail.charset.map
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try {
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if (name == null)
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name = "";
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name = name.replace("\"", "");
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int sp = name.indexOf(" ");
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if (sp > 0)
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name = name.substring(0, sp);
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// WİNDOWS-1254
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name = Normalizer.normalize(name, Normalizer.Form.NFKD)
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.replaceAll("[^\\p{ASCII}]", "");
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name = name.trim().toUpperCase();
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if (name.contains("UTF8") || name.contains("UTF-8")) // //TRANSLIT
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return StandardCharsets.UTF_8;
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// https://charset-normalizer.readthedocs.io/en/latest/support.html
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if (name.contains("GB2312"))
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name = "GB2312";
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if (TextUtils.isEmpty(name) ||
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name.contains("ASCII") ||
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//name.startsWith("ISO8859") ||
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//name.startsWith("ISO-8859") ||
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//name.startsWith("WINDOWS-1252") ||
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//name.startsWith("WINDOWS-1254") ||
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"x-IA5".equalsIgnoreCase(name) ||
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"BASE64".equalsIgnoreCase(name) ||
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"ISO".equalsIgnoreCase(name) ||
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"latin".equalsIgnoreCase(name) ||
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"NONE".equalsIgnoreCase(name) ||
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"CHARSET".equalsIgnoreCase(name) ||
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"UNKNOWN".equalsIgnoreCase(name) ||
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"X-UNKNOWN".equalsIgnoreCase(name) ||
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"8bit".equalsIgnoreCase(name) ||
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"unknown-8bit".equalsIgnoreCase(name))
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return StandardCharsets.ISO_8859_1;
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if (name.contains("1252"))
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name = "windows-1252";
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// Android will prevent recursion
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String jname = MimeUtility.javaCharset(name);
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return Charset.forName(jname);
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} catch (Throwable ex) {
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Log.e("Unknown charset " + name, ex);
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return null;
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}
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}
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}
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