SCP.java

/*
 * This file is part of Arduino.
 *
 * Arduino 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * As a special exception, you may use this file as part of a free software
 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
 * this file and link it with other files to produce an executable, this
 * file does not by itself cause the resulting executable to be covered by
 * the GNU General Public License.  This exception does not however
 * invalidate any other reasons why the executable file might be covered by
 * the GNU General Public License.
 *
 * Copyright 2013 Arduino LLC (http://www.arduino.cc/)
 */

package cc.arduino.packages.ssh;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.Session;

@SuppressWarnings({ "unused", "nls", "unqualified-field-access" })
public class SCP extends SSH {

	private Channel channel;
	private OutputStream out;
	private InputStream in;

	public SCP(Session session) {
		super(session);
	}

	public void open() throws IOException {
		try {
			channel = session.openChannel("exec");
			((ChannelExec) channel).setCommand("scp -t -r -d /");

			out = channel.getOutputStream();
			in = channel.getInputStream();

			channel.connect();
			ensureAcknowledged();
		} catch (Exception e) {
			close();
		}
	}

	public void close() {
		try {
			if (out != null) {
				out.close();
			}
			if (in != null) {
				in.close();
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		if (channel != null) {
			channel.disconnect();
		}
	}

	private void ensureAcknowledged() throws IOException {
		out.flush();

		int b = in.read();

		if (b == 0)
			return;
		if (b == -1)
			return;

		if (b == 1 || b == 2) {
			StringBuilder sb = new StringBuilder();
			sb.append("SCP error: ");

			int c;
			do {
				c = in.read();
				sb.append((char) c);
			} while (c != '\n');

			throw new IOException(sb.toString());
		}

		throw new IOException("Uknown SCP error: " + b);
	}

	public void sendFile(File localFile) throws IOException {
		sendFile(localFile, localFile.getName());
	}

	public void sendFile(File localFile, String remoteFile) throws IOException {
		out.write(("C0644 " + localFile.length() + " " + remoteFile + "\n").getBytes());
		ensureAcknowledged();

		@SuppressWarnings("resource")
		FileInputStream fis = null;
		try {
			fis = new FileInputStream(localFile);
			byte[] buf = new byte[4096];
			while (true) {
				int len = fis.read(buf, 0, buf.length);
				if (len <= 0)
					break;
				out.write(buf, 0, len);
			}

			// \0 terminates file
			buf[0] = 0;
			out.write(buf, 0, 1);
		} finally {
			if (fis != null) {
				fis.close();
			}
		}

		ensureAcknowledged();
	}

	public void startFolder(String folder) throws IOException {
		out.write(("D0755 0 " + folder + "\n").getBytes());
		ensureAcknowledged();
	}

	public void endFolder() throws IOException {
		out.write("E\n".getBytes());
		ensureAcknowledged();
	}

}