--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/ch/ethz/ssh2/SCPClient.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,742 @@
+package ch.ethz.ssh2;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.Charset;
+import java.nio.charset.UnsupportedCharsetException;
+
+/**
+ * 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 ch.ethz.ssh2.Session}.
+ *
+ * @author Christian Plattner, plattner@inf.ethz.ch
+ * @version $Id: SCPClient.java 85 2014-04-07 14:05:09Z dkocher@sudo.ch $
+ */
+
+public class SCPClient {
+    Connection conn;
+
+    String charsetName = null;
+
+    /**
+     * Set the charset used to convert between Java Unicode Strings and byte encodings
+     * used by the server for paths and file names.
+     *
+     * @param charset the name of the charset to be used or <code>null</code> to use the platform's
+     * default encoding.
+     * @throws IOException
+     * @see #getCharset()
+     */
+    public void setCharset(String charset) throws IOException {
+        if (charset == null) {
+            charsetName = charset;
+            return;
+        }
+
+        try {
+            Charset.forName(charset);
+        }
+        catch (UnsupportedCharsetException e) {
+            throw new IOException("This charset is not supported", e);
+        }
+
+        charsetName = charset;
+    }
+
+    /**
+     * The currently used charset for filename encoding/decoding.
+     *
+     * @return The name of the charset (<code>null</code> if the platform's default charset is being used)
+     * @see #setCharset(String)
+     */
+    public String getCharset() {
+        return charsetName;
+    }
+
+    public class LenNamePair {
+        public long length;
+        String filename;
+    }
+
+    public SCPClient(Connection conn) {
+        if (conn == null)
+            throw new IllegalArgumentException("Cannot accept null argument!");
+
+        this.conn = conn;
+    }
+
+    protected 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 + ").");
+    }
+
+    protected String receiveLine(InputStream is) throws IOException {
+        StringBuilder sb = new StringBuilder(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();
+    }
+
+    protected LenNamePair parseCLine(String line) throws IOException {
+        /* Minimum line: "xxxx y z" ---> 8 chars */
+        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.");
+
+        final long len;
+
+        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;
+    }
+
+    /**
+     * The session for opened for this SCP transfer must be closed using
+     * SCPOutputStream#close
+     *
+     * @param remoteFile
+     * @param length The size of the file to send
+     * @param remoteTargetDirectory
+     * @param mode
+     * @return
+     * @throws IOException
+     */
+    public SCPOutputStream put(final String remoteFile, long length, String remoteTargetDirectory, String mode)
+    throws IOException {
+        Session sess = null;
+
+        if (null == remoteFile)
+            throw new IllegalArgumentException("Null argument.");
+
+        if (null == remoteTargetDirectory)
+            remoteTargetDirectory = "";
+
+        if (null == mode)
+            mode = "0600";
+
+        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.length() > 0) ? remoteTargetDirectory : ".";
+        String cmd = "scp -t -d \"" + remoteTargetDirectory + "\"";
+        sess = conn.openSession();
+        sess.execCommand(cmd, charsetName);
+        return new SCPOutputStream(this, sess, remoteFile, length, mode);
+    }
+
+    /**
+     * The session for opened for this SCP transfer must be closed using
+     * SCPInputStream#close
+     *
+     * @param remoteFile
+     * @return
+     * @throws IOException
+     */
+    public SCPInputStream get(final String remoteFile) throws IOException {
+        Session sess = null;
+
+        if (null == remoteFile)
+            throw new IllegalArgumentException("Null argument.");
+
+        if (remoteFile.length() == 0)
+            throw new IllegalArgumentException("Cannot accept empty filename.");
+
+        String cmd = "scp -f";
+        cmd += (" \"" + remoteFile + "\"");
+        sess = conn.openSession();
+        sess.execCommand(cmd, charsetName);
+        return new SCPInputStream(this, sess);
+    }
+    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();
+        }
+    }
+}
+
+