/*
 *  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 Library General Public License
 *  as published by the Free Software Foundation; either version 2 of
 *  the License, or (at your option) any later version.
 *
 *  You may also distribute it and/or modify it under the terms of the
 *  Apache style J2SSH Software License. A copy of which should have
 *  been provided with the distribution.
 *
 *  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
 *  License document supplied with your distribution for more details.
 *
 */
package com.sshtools.j2ssh.sftp;

import com.sshtools.j2ssh.io.*;

import java.io.*;


/**
 *
 *
 * @author $author$
 * @version $Revision: 1.17 $
 */
public class SftpFileOutputStream extends OutputStream {
    SftpFile file;
    UnsignedInteger64 position = new UnsignedInteger64("0");

    /**
     * Creates a new SftpFileOutputStream object.
     *
     * @param file
     *
     * @throws IOException
     */
    public SftpFileOutputStream(SftpFile file) throws IOException {
        if (file.getHandle() == null) {
            throw new IOException("The file does not have a valid handle!");
        }

        if (file.getSFTPSubsystem() == null) {
            throw new IOException(
                "The file is not attached to an SFTP subsystem!");
        }

        this.file = file;
    }

    /**
     *
     *
     * @param buffer
     * @param offset
     * @param len
     *
     * @throws IOException
     */
    public void write(byte[] buffer, int offset, int len)
        throws IOException {
        int pos = 0;
        int count;
        int available;
        int max = (int) file.getSFTPSubsystem().maximumPacketSize();

        while (pos < len) {
            available = ((int) file.getSFTPSubsystem().availableWindowSpace() < max)
                ? (int) file.getSFTPSubsystem().availableWindowSpace() : max;
            count = (available < (len - pos)) ? available : (len - pos);
            file.getSFTPSubsystem().writeFile(file.getHandle(), position,
                buffer, offset + pos, count);
            position = UnsignedInteger64.add(position, count);
            pos += count;
        }
    }

    /**
     *
     *
     * @param b
     *
     * @throws IOException
     */
    public void write(int b) throws IOException {
        byte[] buffer = new byte[1];
        buffer[0] = (byte) b;
        file.getSFTPSubsystem().writeFile(file.getHandle(), position, buffer,
            0, 1);
        position = UnsignedInteger64.add(position, 1);
    }

    /**
     *
     *
     * @throws IOException
     */
    public void close() throws IOException {
        file.close();
    }

    /**
     *
     *
     * @throws IOException
     */
    protected void finalize() throws IOException {
        if (file.getHandle() != null) {
            close();
        }
    }
}
