/*
* SSHTools - Java SSH2 API
*
* Copyright (C) 2002-2003 Lee David Painter and Contributors.
*
* Contributions made by:
*
* Brett Smith
* Richard Pernavas
* Erwin Bolwidt
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package com.sshtools.j2ssh.subsystem;
import com.sshtools.j2ssh.io.ByteArrayWriter;
import com.sshtools.j2ssh.transport.InvalidMessageException;
import java.io.IOException;
import java.io.InputStream;
/**
*
*
* @author $author$
* @version $Revision: 1.19 $
*/
public class SubsystemInputStream extends InputStream {
byte[] msgdata;
int currentPos = 0;
private SubsystemMessageStore messageStore;
/**
* Creates a new SubsystemInputStream object.
*
* @param messageStore
*/
public SubsystemInputStream(SubsystemMessageStore messageStore) {
this.messageStore = messageStore;
}
/**
*
*
* @return
*/
public int available() {
if (msgdata == null) {
return 0;
}
return msgdata.length - currentPos;
}
/**
*
*
* @return
*
* @throws IOException
*/
public int read() throws IOException {
if (msgdata == null) {
collectNextMessage();
}
if (currentPos >= msgdata.length) {
collectNextMessage();
}
return msgdata[currentPos++] & 0xFF;
}
private void collectNextMessage() throws IOException {
SubsystemMessage msg = messageStore.nextMessage();
try {
ByteArrayWriter baw = new ByteArrayWriter();
byte[] data = msg.toByteArray();
baw.writeInt(data.length);
baw.write(data);
msgdata = baw.toByteArray();
} catch (InvalidMessageException ime) {
throw new IOException(
"An invalid message was encountered in the inputstream");
}
currentPos = 0;
}
}