plugins/cvs/trilead-ssh2-build213/src/com/trilead/ssh2/SCPClient.java - platform/tools/idea - Git at Google


 package com.trilead.ssh2;

 import java.io.*;

 /**
  * A very basic <code>SCPClient</code> that can be used to copy files from/to
  * the SSH-2 server. On the server side, the "scp" program must be in the PATH.
  * <p>
  * This scp client is thread safe - you can download (and upload) different sets
  * of files concurrently without any troubles. The <code>SCPClient</code> is
  * actually mapping every request to a distinct {@link Session}.
  *
  * @author Christian Plattner, plattner@trilead.com
  * @version $Id: SCPClient.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
  */

 public class SCPClient
 {
 	Connection conn;

 	class LenNamePair
 	{
 		long length;
 		String filename;
 	}

 	public SCPClient(Connection conn)
 	{
 		if (conn == null)
 			throw new IllegalArgumentException("Cannot accept null argument!");
 		this.conn = conn;
 	}

 	private void readResponse(InputStream is) throws IOException
 	{
 		int c = is.read();

 		if (c == 0)
 			return;

 		if (c == -1)
 			throw new IOException("Remote scp terminated unexpectedly.");

 		if ((c != 1) && (c != 2))
 			throw new IOException("Remote scp sent illegal error code.");

 		if (c == 2)
 			throw new IOException("Remote scp terminated with error.");

 		String err = receiveLine(is);
 		throw new IOException("Remote scp terminated with error (" + err + ").");
 	}

 	private String receiveLine(InputStream is) throws IOException
 	{
 		StringBuffer sb = new StringBuffer(30);

 		while (true)
 		{
 			/*
 			 * This is a random limit - if your path names are longer, then
 			 * adjust it
 			 */

 			if (sb.length() > 8192)
 				throw new IOException("Remote scp sent a too long line");

 			int c = is.read();

 			if (c < 0)
 				throw new IOException("Remote scp terminated unexpectedly.");

 			if (c == '\n')
 				break;

 			sb.append((char) c);

 		}
 		return sb.toString();
 	}

 	private LenNamePair parseCLine(String line) throws IOException
 	{
 		/* Minimum line: "xxxx y z" ---> 8 chars */

 		long len;

 		if (line.length() < 8)
 			throw new IOException("Malformed C line sent by remote SCP binary, line too short.");

 		if ((line.charAt(4) != ' ') || (line.charAt(5) == ' '))
 			throw new IOException("Malformed C line sent by remote SCP binary.");

 		int length_name_sep = line.indexOf(' ', 5);

 		if (length_name_sep == -1)
 			throw new IOException("Malformed C line sent by remote SCP binary.");

 		String length_substring = line.substring(5, length_name_sep);
 		String name_substring = line.substring(length_name_sep + 1);

 		if ((length_substring.length() <= 0) || (name_substring.length() <= 0))
 			throw new IOException("Malformed C line sent by remote SCP binary.");

 		if ((6 + length_substring.length() + name_substring.length()) != line.length())
 			throw new IOException("Malformed C line sent by remote SCP binary.");

 		try
 		{
 			len = Long.parseLong(length_substring);
 		}
 		catch (NumberFormatException e)
 		{
 			throw new IOException("Malformed C line sent by remote SCP binary, cannot parse file length.");
 		}

 		if (len < 0)
 			throw new IOException("Malformed C line sent by remote SCP binary, illegal file length.");

 		LenNamePair lnp = new LenNamePair();
 		lnp.length = len;
 		lnp.filename = name_substring;

 		return lnp;
 	}

 	private void sendBytes(Session sess, byte[] data, String fileName, String mode) throws IOException
 	{
 		OutputStream os = sess.getStdin();
 		InputStream is = new BufferedInputStream(sess.getStdout(), 512);

 		readResponse(is);

 		String cline = "C" + mode + " " + data.length + " " + fileName + "\n";

 		os.write(cline.getBytes("ISO-8859-1"));
 		os.flush();

 		readResponse(is);

 		os.write(data, 0, data.length);
 		os.write(0);
 		os.flush();

 		readResponse(is);

 		os.write("E\n".getBytes("ISO-8859-1"));
 		os.flush();
 	}

 	private void sendFiles(Session sess, String[] files, String[] remoteFiles, String mode) throws IOException
 	{
 		byte[] buffer = new byte[8192];

 		OutputStream os = new BufferedOutputStream(sess.getStdin(), 40000);
 		InputStream is = new BufferedInputStream(sess.getStdout(), 512);

 		readResponse(is);

 		for (int i = 0; i < files.length; i++)
 		{
 			File f = new File(files[i]);
 			long remain = f.length();

 			String remoteName;

 			if ((remoteFiles != null) && (remoteFiles.length > i) && (remoteFiles[i] != null))
 				remoteName = remoteFiles[i];
 			else
 				remoteName = f.getName();

 			String cline = "C" + mode + " " + remain + " " + remoteName + "\n";

 			os.write(cline.getBytes("ISO-8859-1"));
 			os.flush();

 			readResponse(is);

 			FileInputStream fis = null;

 			try
 			{
 				fis = new FileInputStream(f);

 				while (remain > 0)
 				{
 					int trans;
 					if (remain > buffer.length)
 						trans = buffer.length;
 					else
 						trans = (int) remain;

 					if (fis.read(buffer, 0, trans) != trans)
 						throw new IOException("Cannot read enough from local file " + files[i]);

 					os.write(buffer, 0, trans);

 					remain -= trans;
 				}
 			}
 			finally
 			{
 				if (fis != null)
 					fis.close();
 			}

 			os.write(0);
 			os.flush();

 			readResponse(is);
 		}

 		os.write("E\n".getBytes("ISO-8859-1"));
 		os.flush();
 	}

 	private void receiveFiles(Session sess, OutputStream[] targets) throws IOException
 	{
 		byte[] buffer = new byte[8192];

 		OutputStream os = new BufferedOutputStream(sess.getStdin(), 512);
 		InputStream is = new BufferedInputStream(sess.getStdout(), 40000);

 		os.write(0x0);
 		os.flush();

 		for (int i = 0; i < targets.length; i++)
 		{
 			LenNamePair lnp = null;

 			while (true)
 			{
 				int c = is.read();
 				if (c < 0)
 					throw new IOException("Remote scp terminated unexpectedly.");

 				String line = receiveLine(is);

 				if (c == 'T')
 				{
 					/* Ignore modification times */

 					continue;
 				}

 				if ((c == 1) || (c == 2))
 					throw new IOException("Remote SCP error: " + line);

 				if (c == 'C')
 				{
 					lnp = parseCLine(line);
 					break;

 				}
 				throw new IOException("Remote SCP error: " + ((char) c) + line);
 			}

 			os.write(0x0);
 			os.flush();

 			long remain = lnp.length;

 			while (remain > 0)
 			{
 				int trans;
 				if (remain > buffer.length)
 					trans = buffer.length;
 				else
 					trans = (int) remain;

 				int this_time_received = is.read(buffer, 0, trans);

 				if (this_time_received < 0)
 				{
 					throw new IOException("Remote scp terminated connection unexpectedly");
 				}

 				targets[i].write(buffer, 0, this_time_received);

 				remain -= this_time_received;
 			}

 			readResponse(is);

 			os.write(0x0);
 			os.flush();
 		}
 	}

 	private void receiveFiles(Session sess, String[] files, String target) throws IOException
 	{
 		byte[] buffer = new byte[8192];

 		OutputStream os = new BufferedOutputStream(sess.getStdin(), 512);
 		InputStream is = new BufferedInputStream(sess.getStdout(), 40000);

 		os.write(0x0);
 		os.flush();

 		for (int i = 0; i < files.length; i++)
 		{
 			LenNamePair lnp = null;

 			while (true)
 			{
 				int c = is.read();
 				if (c < 0)
 					throw new IOException("Remote scp terminated unexpectedly.");

 				String line = receiveLine(is);

 				if (c == 'T')
 				{
 					/* Ignore modification times */

 					continue;
 				}

 				if ((c == 1) || (c == 2))
 					throw new IOException("Remote SCP error: " + line);

 				if (c == 'C')
 				{
 					lnp = parseCLine(line);
 					break;

 				}
 				throw new IOException("Remote SCP error: " + ((char) c) + line);
 			}

 			os.write(0x0);
 			os.flush();

 			File f = new File(target + File.separatorChar + lnp.filename);
 			FileOutputStream fop = null;

 			try
 			{
 				fop = new FileOutputStream(f);

 				long remain = lnp.length;

 				while (remain > 0)
 				{
 					int trans;
 					if (remain > buffer.length)
 						trans = buffer.length;
 					else
 						trans = (int) remain;

 					int this_time_received = is.read(buffer, 0, trans);

 					if (this_time_received < 0)
 					{
 						throw new IOException("Remote scp terminated connection unexpectedly");
 					}

 					fop.write(buffer, 0, this_time_received);

 					remain -= this_time_received;
 				}
 			}
 			finally
 			{
 				if (fop != null)
 					fop.close();
 			}

 			readResponse(is);

 			os.write(0x0);
 			os.flush();
 		}
 	}

 	/**
 	 * Copy a local file to a remote directory, uses mode 0600 when creating the
 	 * file on the remote side.
 	 *
 	 * @param localFile
 	 *            Path and name of local file.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 *
 	 * @throws IOException
 	 */
 	public void put(String localFile, String remoteTargetDirectory) throws IOException
 	{
 		put(new String[] { localFile }, remoteTargetDirectory, "0600");
 	}

 	/**
 	 * Copy a set of local files to a remote directory, uses mode 0600 when
 	 * creating files on the remote side.
 	 *
 	 * @param localFiles
 	 *            Paths and names of local file names.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 *
 	 * @throws IOException
 	 */

 	public void put(String[] localFiles, String remoteTargetDirectory) throws IOException
 	{
 		put(localFiles, remoteTargetDirectory, "0600");
 	}

 	/**
 	 * Copy a local file to a remote directory, uses the specified mode when
 	 * creating the file on the remote side.
 	 *
 	 * @param localFile
 	 *            Path and name of local file.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 * @param mode
 	 *            a four digit string (e.g., 0644, see "man chmod", "man open")
 	 * @throws IOException
 	 */
 	public void put(String localFile, String remoteTargetDirectory, String mode) throws IOException
 	{
 		put(new String[] { localFile }, remoteTargetDirectory, mode);
 	}

 	/**
 	 * Copy a local file to a remote directory, uses the specified mode and
 	 * remote filename when creating the file on the remote side.
 	 *
 	 * @param localFile
 	 *            Path and name of local file.
 	 * @param remoteFileName
 	 *            The name of the file which will be created in the remote
 	 *            target directory.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 * @param mode
 	 *            a four digit string (e.g., 0644, see "man chmod", "man open")
 	 * @throws IOException
 	 */
 	public void put(String localFile, String remoteFileName, String remoteTargetDirectory, String mode)
 			throws IOException
 	{
 		put(new String[] { localFile }, new String[] { remoteFileName }, remoteTargetDirectory, mode);
 	}

 	/**
 	 * Create a remote file and copy the contents of the passed byte array into
 	 * it. Uses mode 0600 for creating the remote file.
 	 *
 	 * @param data
 	 *            the data to be copied into the remote file.
 	 * @param remoteFileName
 	 *            The name of the file which will be created in the remote
 	 *            target directory.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 * @throws IOException
 	 */

 	public void put(byte[] data, String remoteFileName, String remoteTargetDirectory) throws IOException
 	{
 		put(data, remoteFileName, remoteTargetDirectory, "0600");
 	}

 	/**
 	 * Create a remote file and copy the contents of the passed byte array into
 	 * it. The method use the specified mode when creating the file on the
 	 * remote side.
 	 *
 	 * @param data
 	 *            the data to be copied into the remote file.
 	 * @param remoteFileName
 	 *            The name of the file which will be created in the remote
 	 *            target directory.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 * @param mode
 	 *            a four digit string (e.g., 0644, see "man chmod", "man open")
 	 * @throws IOException
 	 */
 	public void put(byte[] data, String remoteFileName, String remoteTargetDirectory, String mode) throws IOException
 	{
 		Session sess = null;

 		if ((remoteFileName == null) || (remoteTargetDirectory == null) || (mode == null))
 			throw new IllegalArgumentException("Null argument.");

 		if (mode.length() != 4)
 			throw new IllegalArgumentException("Invalid mode.");

 		for (int i = 0; i < mode.length(); i++)
 			if (Character.isDigit(mode.charAt(i)) == false)
 				throw new IllegalArgumentException("Invalid mode.");

 		remoteTargetDirectory = remoteTargetDirectory.trim();
 		remoteTargetDirectory = (remoteTargetDirectory.length() > 0) ? remoteTargetDirectory : ".";

 		String cmd = "scp -t -d " + remoteTargetDirectory;

 		try
 		{
 			sess = conn.openSession();
 			sess.execCommand(cmd);
 			sendBytes(sess, data, remoteFileName, mode);
 		}
 		catch (IOException e)
 		{
 			throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
 		}
 		finally
 		{
 			if (sess != null)
 				sess.close();
 		}
 	}

 	/**
 	 * Copy a set of local files to a remote directory, uses the specified mode
 	 * when creating the files on the remote side.
 	 *
 	 * @param localFiles
 	 *            Paths and names of the local files.
 	 * @param remoteTargetDirectory
 	 *            Remote target directory. Use an empty string to specify the
 	 *            default directory.
 	 * @param mode
 	 *            a four digit string (e.g., 0644, see "man chmod", "man open")
 	 * @throws IOException
 	 */
 	public void put(String[] localFiles, String remoteTargetDirectory, String mode) throws IOException
 	{
 		put(localFiles, null, remoteTargetDirectory, mode);
 	}

 	public void put(String[] localFiles, String[] remoteFiles, String remoteTargetDirectory, String mode)
 			throws IOException
 	{
 		Session sess = null;

 		/*
 		 * remoteFiles may be null, indicating that the local filenames shall be
 		 * used
 		 */

 		if ((localFiles == null) || (remoteTargetDirectory == null) || (mode == null))
 			throw new IllegalArgumentException("Null argument.");

 		if (mode.length() != 4)
 			throw new IllegalArgumentException("Invalid mode.");

 		for (int i = 0; i < mode.length(); i++)
 			if (Character.isDigit(mode.charAt(i)) == false)
 				throw new IllegalArgumentException("Invalid mode.");

 		if (localFiles.length == 0)
 			return;

 		remoteTargetDirectory = remoteTargetDirectory.trim();
 		remoteTargetDirectory = (remoteTargetDirectory.length() > 0) ? remoteTargetDirectory : ".";

 		String cmd = "scp -t -d " + remoteTargetDirectory;

 		for (int i = 0; i < localFiles.length; i++)
 		{
 			if (localFiles[i] == null)
 				throw new IllegalArgumentException("Cannot accept null filename.");
 		}

 		try
 		{
 			sess = conn.openSession();
 			sess.execCommand(cmd);
 			sendFiles(sess, localFiles, remoteFiles, mode);
 		}
 		catch (IOException e)
 		{
 			throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
 		}
 		finally
 		{
 			if (sess != null)
 				sess.close();
 		}
 	}

 	/**
 	 * Download a file from the remote server to a local directory.
 	 *
 	 * @param remoteFile
 	 *            Path and name of the remote file.
 	 * @param localTargetDirectory
 	 *            Local directory to put the downloaded file.
 	 *
 	 * @throws IOException
 	 */
 	public void get(String remoteFile, String localTargetDirectory) throws IOException
 	{
 		get(new String[] { remoteFile }, localTargetDirectory);
 	}

 	/**
 	 * Download a file from the remote server and pipe its contents into an
 	 * <code>OutputStream</code>. Please note that, to enable flexible usage
 	 * of this method, the <code>OutputStream</code> will not be closed nor
 	 * flushed.
 	 *
 	 * @param remoteFile
 	 *            Path and name of the remote file.
 	 * @param target
 	 *            OutputStream where the contents of the file will be sent to.
 	 * @throws IOException
 	 */
 	public void get(String remoteFile, OutputStream target) throws IOException
 	{
 		get(new String[] { remoteFile }, new OutputStream[] { target });
 	}

 	private void get(String remoteFiles[], OutputStream[] targets) throws IOException
 	{
 		Session sess = null;

 		if ((remoteFiles == null) || (targets == null))
 			throw new IllegalArgumentException("Null argument.");

 		if (remoteFiles.length != targets.length)
 			throw new IllegalArgumentException("Length of arguments does not match.");

 		if (remoteFiles.length == 0)
 			return;

 		String cmd = "scp -f";

 		for (int i = 0; i < remoteFiles.length; i++)
 		{
 			if (remoteFiles[i] == null)
 				throw new IllegalArgumentException("Cannot accept null filename.");

 			String tmp = remoteFiles[i].trim();

 			if (tmp.length() == 0)
 				throw new IllegalArgumentException("Cannot accept empty filename.");

 			cmd += (" " + tmp);
 		}

 		try
 		{
 			sess = conn.openSession();
 			sess.execCommand(cmd);
 			receiveFiles(sess, targets);
 		}
 		catch (IOException e)
 		{
 			throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
 		}
 		finally
 		{
 			if (sess != null)
 				sess.close();
 		}
 	}

 	/**
 	 * Download a set of files from the remote server to a local directory.
 	 *
 	 * @param remoteFiles
 	 *            Paths and names of the remote files.
 	 * @param localTargetDirectory
 	 *            Local directory to put the downloaded files.
 	 *
 	 * @throws IOException
 	 */
 	public void get(String remoteFiles[], String localTargetDirectory) throws IOException
 	{
 		Session sess = null;

 		if ((remoteFiles == null) || (localTargetDirectory == null))
 			throw new IllegalArgumentException("Null argument.");

 		if (remoteFiles.length == 0)
 			return;

 		String cmd = "scp -f";

 		for (int i = 0; i < remoteFiles.length; i++)
 		{
 			if (remoteFiles[i] == null)
 				throw new IllegalArgumentException("Cannot accept null filename.");

 			String tmp = remoteFiles[i].trim();

 			if (tmp.length() == 0)
 				throw new IllegalArgumentException("Cannot accept empty filename.");

 			cmd += (" " + tmp);
 		}

 		try
 		{
 			sess = conn.openSession();
 			sess.execCommand(cmd);
 			receiveFiles(sess, remoteFiles, localTargetDirectory);
 		}
 		catch (IOException e)
 		{
 			throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
 		}
 		finally
 		{
 			if (sess != null)
 				sess.close();
 		}
 	}
 }

	package com.trilead.ssh2;

	import java.io.*;

	/**
	* A very basic <code>SCPClient</code> that can be used to copy files from/to
	* the SSH-2 server. On the server side, the "scp" program must be in the PATH.
	* <p>
	* This scp client is thread safe - you can download (and upload) different sets
	* of files concurrently without any troubles. The <code>SCPClient</code> is
	* actually mapping every request to a distinct {@link Session}.
	*
	* @author Christian Plattner, plattner@trilead.com
	* @version $Id: SCPClient.java,v 1.2 2008/04/01 12:38:09 cplattne Exp $
	*/

	public class SCPClient
	{
	Connection conn;

	class LenNamePair
	{
	long length;
	String filename;
	}

	public SCPClient(Connection conn)
	{
	if (conn == null)
	throw new IllegalArgumentException("Cannot accept null argument!");
	this.conn = conn;
	}

	private void readResponse(InputStream is) throws IOException
	{
	int c = is.read();

	if (c == 0)
	return;

	if (c == -1)
	throw new IOException("Remote scp terminated unexpectedly.");

	if ((c != 1) && (c != 2))
	throw new IOException("Remote scp sent illegal error code.");

	if (c == 2)
	throw new IOException("Remote scp terminated with error.");

	String err = receiveLine(is);
	throw new IOException("Remote scp terminated with error (" + err + ").");
	}

	private String receiveLine(InputStream is) throws IOException
	{
	StringBuffer sb = new StringBuffer(30);

	while (true)
	{
	/*
	* This is a random limit - if your path names are longer, then
	* adjust it
	*/

	if (sb.length() > 8192)
	throw new IOException("Remote scp sent a too long line");

	int c = is.read();

	if (c < 0)
	throw new IOException("Remote scp terminated unexpectedly.");

	if (c == '\n')
	break;

	sb.append((char) c);

	}
	return sb.toString();
	}

	private LenNamePair parseCLine(String line) throws IOException
	{
	/* Minimum line: "xxxx y z" ---> 8 chars */

	long len;

	if (line.length() < 8)
	throw new IOException("Malformed C line sent by remote SCP binary, line too short.");

	if ((line.charAt(4) != ' ') \|\| (line.charAt(5) == ' '))
	throw new IOException("Malformed C line sent by remote SCP binary.");

	int length_name_sep = line.indexOf(' ', 5);

	if (length_name_sep == -1)
	throw new IOException("Malformed C line sent by remote SCP binary.");

	String length_substring = line.substring(5, length_name_sep);
	String name_substring = line.substring(length_name_sep + 1);

	if ((length_substring.length() <= 0) \|\| (name_substring.length() <= 0))
	throw new IOException("Malformed C line sent by remote SCP binary.");

	if ((6 + length_substring.length() + name_substring.length()) != line.length())
	throw new IOException("Malformed C line sent by remote SCP binary.");

	try
	{
	len = Long.parseLong(length_substring);
	}
	catch (NumberFormatException e)
	{
	throw new IOException("Malformed C line sent by remote SCP binary, cannot parse file length.");
	}

	if (len < 0)
	throw new IOException("Malformed C line sent by remote SCP binary, illegal file length.");

	LenNamePair lnp = new LenNamePair();
	lnp.length = len;
	lnp.filename = name_substring;

	return lnp;
	}

	private void sendBytes(Session sess, byte[] data, String fileName, String mode) throws IOException
	{
	OutputStream os = sess.getStdin();
	InputStream is = new BufferedInputStream(sess.getStdout(), 512);

	readResponse(is);

	String cline = "C" + mode + " " + data.length + " " + fileName + "\n";

	os.write(cline.getBytes("ISO-8859-1"));
	os.flush();

	readResponse(is);

	os.write(data, 0, data.length);
	os.write(0);
	os.flush();

	readResponse(is);

	os.write("E\n".getBytes("ISO-8859-1"));
	os.flush();
	}

	private void sendFiles(Session sess, String[] files, String[] remoteFiles, String mode) throws IOException
	{
	byte[] buffer = new byte[8192];

	OutputStream os = new BufferedOutputStream(sess.getStdin(), 40000);
	InputStream is = new BufferedInputStream(sess.getStdout(), 512);

	readResponse(is);

	for (int i = 0; i < files.length; i++)
	{
	File f = new File(files[i]);
	long remain = f.length();

	String remoteName;

	if ((remoteFiles != null) && (remoteFiles.length > i) && (remoteFiles[i] != null))
	remoteName = remoteFiles[i];
	else
	remoteName = f.getName();

	String cline = "C" + mode + " " + remain + " " + remoteName + "\n";

	os.write(cline.getBytes("ISO-8859-1"));
	os.flush();

	readResponse(is);

	FileInputStream fis = null;

	try
	{
	fis = new FileInputStream(f);

	while (remain > 0)
	{
	int trans;
	if (remain > buffer.length)
	trans = buffer.length;
	else
	trans = (int) remain;

	if (fis.read(buffer, 0, trans) != trans)
	throw new IOException("Cannot read enough from local file " + files[i]);

	os.write(buffer, 0, trans);

	remain -= trans;
	}
	}
	finally
	{
	if (fis != null)
	fis.close();
	}

	os.write(0);
	os.flush();

	readResponse(is);
	}

	os.write("E\n".getBytes("ISO-8859-1"));
	os.flush();
	}

	private void receiveFiles(Session sess, OutputStream[] targets) throws IOException
	{
	byte[] buffer = new byte[8192];

	OutputStream os = new BufferedOutputStream(sess.getStdin(), 512);
	InputStream is = new BufferedInputStream(sess.getStdout(), 40000);

	os.write(0x0);
	os.flush();

	for (int i = 0; i < targets.length; i++)
	{
	LenNamePair lnp = null;

	while (true)
	{
	int c = is.read();
	if (c < 0)
	throw new IOException("Remote scp terminated unexpectedly.");

	String line = receiveLine(is);

	if (c == 'T')
	{
	/* Ignore modification times */

	continue;
	}

	if ((c == 1) \|\| (c == 2))
	throw new IOException("Remote SCP error: " + line);

	if (c == 'C')
	{
	lnp = parseCLine(line);
	break;

	}
	throw new IOException("Remote SCP error: " + ((char) c) + line);
	}

	os.write(0x0);
	os.flush();

	long remain = lnp.length;

	while (remain > 0)
	{
	int trans;
	if (remain > buffer.length)
	trans = buffer.length;
	else
	trans = (int) remain;

	int this_time_received = is.read(buffer, 0, trans);

	if (this_time_received < 0)
	{
	throw new IOException("Remote scp terminated connection unexpectedly");
	}

	targets[i].write(buffer, 0, this_time_received);

	remain -= this_time_received;
	}

	readResponse(is);

	os.write(0x0);
	os.flush();
	}
	}

	private void receiveFiles(Session sess, String[] files, String target) throws IOException
	{
	byte[] buffer = new byte[8192];

	OutputStream os = new BufferedOutputStream(sess.getStdin(), 512);
	InputStream is = new BufferedInputStream(sess.getStdout(), 40000);

	os.write(0x0);
	os.flush();

	for (int i = 0; i < files.length; i++)
	{
	LenNamePair lnp = null;

	while (true)
	{
	int c = is.read();
	if (c < 0)
	throw new IOException("Remote scp terminated unexpectedly.");

	String line = receiveLine(is);

	if (c == 'T')
	{
	/* Ignore modification times */

	continue;
	}

	if ((c == 1) \|\| (c == 2))
	throw new IOException("Remote SCP error: " + line);

	if (c == 'C')
	{
	lnp = parseCLine(line);
	break;

	}
	throw new IOException("Remote SCP error: " + ((char) c) + line);
	}

	os.write(0x0);
	os.flush();

	File f = new File(target + File.separatorChar + lnp.filename);
	FileOutputStream fop = null;

	try
	{
	fop = new FileOutputStream(f);

	long remain = lnp.length;

	while (remain > 0)
	{
	int trans;
	if (remain > buffer.length)
	trans = buffer.length;
	else
	trans = (int) remain;

	int this_time_received = is.read(buffer, 0, trans);

	if (this_time_received < 0)
	{
	throw new IOException("Remote scp terminated connection unexpectedly");
	}

	fop.write(buffer, 0, this_time_received);

	remain -= this_time_received;
	}
	}
	finally
	{
	if (fop != null)
	fop.close();
	}

	readResponse(is);

	os.write(0x0);
	os.flush();
	}
	}

	/**
	* Copy a local file to a remote directory, uses mode 0600 when creating the
	* file on the remote side.
	*
	* @param localFile
	* Path and name of local file.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	*
	* @throws IOException
	*/
	public void put(String localFile, String remoteTargetDirectory) throws IOException
	{
	put(new String[] { localFile }, remoteTargetDirectory, "0600");
	}

	/**
	* Copy a set of local files to a remote directory, uses mode 0600 when
	* creating files on the remote side.
	*
	* @param localFiles
	* Paths and names of local file names.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	*
	* @throws IOException
	*/

	public void put(String[] localFiles, String remoteTargetDirectory) throws IOException
	{
	put(localFiles, remoteTargetDirectory, "0600");
	}

	/**
	* Copy a local file to a remote directory, uses the specified mode when
	* creating the file on the remote side.
	*
	* @param localFile
	* Path and name of local file.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	* @param mode
	* a four digit string (e.g., 0644, see "man chmod", "man open")
	* @throws IOException
	*/
	public void put(String localFile, String remoteTargetDirectory, String mode) throws IOException
	{
	put(new String[] { localFile }, remoteTargetDirectory, mode);
	}

	/**
	* Copy a local file to a remote directory, uses the specified mode and
	* remote filename when creating the file on the remote side.
	*
	* @param localFile
	* Path and name of local file.
	* @param remoteFileName
	* The name of the file which will be created in the remote
	* target directory.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	* @param mode
	* a four digit string (e.g., 0644, see "man chmod", "man open")
	* @throws IOException
	*/
	public void put(String localFile, String remoteFileName, String remoteTargetDirectory, String mode)
	throws IOException
	{
	put(new String[] { localFile }, new String[] { remoteFileName }, remoteTargetDirectory, mode);
	}

	/**
	* Create a remote file and copy the contents of the passed byte array into
	* it. Uses mode 0600 for creating the remote file.
	*
	* @param data
	* the data to be copied into the remote file.
	* @param remoteFileName
	* The name of the file which will be created in the remote
	* target directory.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	* @throws IOException
	*/

	public void put(byte[] data, String remoteFileName, String remoteTargetDirectory) throws IOException
	{
	put(data, remoteFileName, remoteTargetDirectory, "0600");
	}

	/**
	* Create a remote file and copy the contents of the passed byte array into
	* it. The method use the specified mode when creating the file on the
	* remote side.
	*
	* @param data
	* the data to be copied into the remote file.
	* @param remoteFileName
	* The name of the file which will be created in the remote
	* target directory.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	* @param mode
	* a four digit string (e.g., 0644, see "man chmod", "man open")
	* @throws IOException
	*/
	public void put(byte[] data, String remoteFileName, String remoteTargetDirectory, String mode) throws IOException
	{
	Session sess = null;

	if ((remoteFileName == null) \|\| (remoteTargetDirectory == null) \|\| (mode == null))
	throw new IllegalArgumentException("Null argument.");

	if (mode.length() != 4)
	throw new IllegalArgumentException("Invalid mode.");

	for (int i = 0; i < mode.length(); i++)
	if (Character.isDigit(mode.charAt(i)) == false)
	throw new IllegalArgumentException("Invalid mode.");

	remoteTargetDirectory = remoteTargetDirectory.trim();
	remoteTargetDirectory = (remoteTargetDirectory.length() > 0) ? remoteTargetDirectory : ".";

	String cmd = "scp -t -d " + remoteTargetDirectory;

	try
	{
	sess = conn.openSession();
	sess.execCommand(cmd);
	sendBytes(sess, data, remoteFileName, mode);
	}
	catch (IOException e)
	{
	throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
	}
	finally
	{
	if (sess != null)
	sess.close();
	}
	}

	/**
	* Copy a set of local files to a remote directory, uses the specified mode
	* when creating the files on the remote side.
	*
	* @param localFiles
	* Paths and names of the local files.
	* @param remoteTargetDirectory
	* Remote target directory. Use an empty string to specify the
	* default directory.
	* @param mode
	* a four digit string (e.g., 0644, see "man chmod", "man open")
	* @throws IOException
	*/
	public void put(String[] localFiles, String remoteTargetDirectory, String mode) throws IOException
	{
	put(localFiles, null, remoteTargetDirectory, mode);
	}

	public void put(String[] localFiles, String[] remoteFiles, String remoteTargetDirectory, String mode)
	throws IOException
	{
	Session sess = null;

	/*
	* remoteFiles may be null, indicating that the local filenames shall be
	* used
	*/

	if ((localFiles == null) \|\| (remoteTargetDirectory == null) \|\| (mode == null))
	throw new IllegalArgumentException("Null argument.");

	if (mode.length() != 4)
	throw new IllegalArgumentException("Invalid mode.");

	for (int i = 0; i < mode.length(); i++)
	if (Character.isDigit(mode.charAt(i)) == false)
	throw new IllegalArgumentException("Invalid mode.");

	if (localFiles.length == 0)
	return;

	remoteTargetDirectory = remoteTargetDirectory.trim();
	remoteTargetDirectory = (remoteTargetDirectory.length() > 0) ? remoteTargetDirectory : ".";

	String cmd = "scp -t -d " + remoteTargetDirectory;

	for (int i = 0; i < localFiles.length; i++)
	{
	if (localFiles[i] == null)
	throw new IllegalArgumentException("Cannot accept null filename.");
	}

	try
	{
	sess = conn.openSession();
	sess.execCommand(cmd);
	sendFiles(sess, localFiles, remoteFiles, mode);
	}
	catch (IOException e)
	{
	throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
	}
	finally
	{
	if (sess != null)
	sess.close();
	}
	}

	/**
	* Download a file from the remote server to a local directory.
	*
	* @param remoteFile
	* Path and name of the remote file.
	* @param localTargetDirectory
	* Local directory to put the downloaded file.
	*
	* @throws IOException
	*/
	public void get(String remoteFile, String localTargetDirectory) throws IOException
	{
	get(new String[] { remoteFile }, localTargetDirectory);
	}

	/**
	* Download a file from the remote server and pipe its contents into an
	* <code>OutputStream</code>. Please note that, to enable flexible usage
	* of this method, the <code>OutputStream</code> will not be closed nor
	* flushed.
	*
	* @param remoteFile
	* Path and name of the remote file.
	* @param target
	* OutputStream where the contents of the file will be sent to.
	* @throws IOException
	*/
	public void get(String remoteFile, OutputStream target) throws IOException
	{
	get(new String[] { remoteFile }, new OutputStream[] { target });
	}

	private void get(String remoteFiles[], OutputStream[] targets) throws IOException
	{
	Session sess = null;

	if ((remoteFiles == null) \|\| (targets == null))
	throw new IllegalArgumentException("Null argument.");

	if (remoteFiles.length != targets.length)
	throw new IllegalArgumentException("Length of arguments does not match.");

	if (remoteFiles.length == 0)
	return;

	String cmd = "scp -f";

	for (int i = 0; i < remoteFiles.length; i++)
	{
	if (remoteFiles[i] == null)
	throw new IllegalArgumentException("Cannot accept null filename.");

	String tmp = remoteFiles[i].trim();

	if (tmp.length() == 0)
	throw new IllegalArgumentException("Cannot accept empty filename.");

	cmd += (" " + tmp);
	}

	try
	{
	sess = conn.openSession();
	sess.execCommand(cmd);
	receiveFiles(sess, targets);
	}
	catch (IOException e)
	{
	throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
	}
	finally
	{
	if (sess != null)
	sess.close();
	}
	}

	/**
	* Download a set of files from the remote server to a local directory.
	*
	* @param remoteFiles
	* Paths and names of the remote files.
	* @param localTargetDirectory
	* Local directory to put the downloaded files.
	*
	* @throws IOException
	*/
	public void get(String remoteFiles[], String localTargetDirectory) throws IOException
	{
	Session sess = null;

	if ((remoteFiles == null) \|\| (localTargetDirectory == null))
	throw new IllegalArgumentException("Null argument.");

	if (remoteFiles.length == 0)
	return;

	String cmd = "scp -f";

	for (int i = 0; i < remoteFiles.length; i++)
	{
	if (remoteFiles[i] == null)
	throw new IllegalArgumentException("Cannot accept null filename.");

	String tmp = remoteFiles[i].trim();

	if (tmp.length() == 0)
	throw new IllegalArgumentException("Cannot accept empty filename.");

	cmd += (" " + tmp);
	}

	try
	{
	sess = conn.openSession();
	sess.execCommand(cmd);
	receiveFiles(sess, remoteFiles, localTargetDirectory);
	}
	catch (IOException e)
	{
	throw (IOException) new IOException("Error during SCP transfer.").initCause(e);
	}
	finally
	{
	if (sess != null)
	sess.close();
	}
	}
	}