/*
* This file is part of muCommander, http://www.mucommander.com
* Copyright (C) 2002-2016 Maxence Bernard
*
* muCommander 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.
*
* muCommander 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, see <http://www.gnu.org/licenses/>.
*/
package com.mucommander.shell;
import java.io.ByteArrayOutputStream;
import java.nio.charset.Charset;
import com.mucommander.commons.io.EncodingDetector;
import com.mucommander.conf.MuConfigurations;
import com.mucommander.conf.MuPreference;
import com.mucommander.process.ProcessListener;
/**
* Listens to shell output and tries to guess at its encoding.
* @author Nicolas Rinaudo
*/
class ShellEncodingListener implements ProcessListener {
private static ByteArrayOutputStream out = new ByteArrayOutputStream();
public synchronized void processDied(int returnValue) {
String encoding;
String oldEncoding;
// Abort if there is no need to identify the encoding anymore.
if(out == null)
return;
// Attempts to guess at the encoding. If no guess can be made, ignore.
if((encoding = EncodingDetector.detectEncoding(out.toByteArray())) == null)
return;
// Checks whether the detected charset is supported.
if(Charset.isSupported(encoding)) {
oldEncoding = MuConfigurations.getPreferences().getVariable(MuPreference.SHELL_ENCODING);
// If no encoding was previously set, or we have found a new encoding, change the current shell encoding.
if((oldEncoding == null) || !encoding.equals(oldEncoding))
MuConfigurations.getPreferences().setVariable(MuPreference.SHELL_ENCODING, encoding);
// Stop listening for new byte input if we have gathered a large enough sample set.
if(out.size() >= EncodingDetector.MAX_RECOMMENDED_BYTE_SIZE)
out = null;
}
}
/**
* Ignored.
*/
public void processOutput(String output) {}
public synchronized void processOutput(byte[] buff, int from, int len) {
if(out != null && (len = Math.min(len, EncodingDetector.MAX_RECOMMENDED_BYTE_SIZE - out.size())) > 0)
out.write(buff, from, len);
}
}