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/*
* $Id: BlockOutputStream.java,v 1.4 2004/06/08 19:05:27 dog Exp $
* Copyright (C) 2003 The Free Software Foundation
*
* This file is part of GNU inetlib, a library.
*
* GNU inetlib 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.
*
* GNU inetlib 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* As a special exception, if you link this library with other files to
* produce an executable, this library 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.
*/
package gnu.inet.ftp;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* A DTP output stream that implements the FTP block transfer mode.
*
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
* @version $Revision: 1.4 $ $Date: 2004/06/08 19:05:27 $
*/
class BlockOutputStream extends DTPOutputStream
{
static final byte RECORD = -128; // 0x80
static final byte EOF = 64; // 0x40
BlockOutputStream (DTP dtp, OutputStream out)
{
super (dtp, out);
}
public void write (int c) throws IOException
{
if (transferComplete)
{
return;
}
byte[] buf = new byte[]
{
RECORD, /* record descriptor */
0x00, 0x01, /* one byte */
(byte) c /* the byte */
};
out.write (buf, 0, 4);
}
public void write (byte[] b) throws IOException
{
write (b, 0, b.length);
}
public void write (byte[] b, int off, int len) throws IOException
{
if (transferComplete)
{
return;
}
byte[] buf = new byte[len + 3];
buf[0] = RECORD; /* record descriptor */
buf[1] = (byte) ((len & 0x00ff) >> 8); /* high byte of bytecount */
buf[2] = (byte) (len & 0xff00); /* low byte of bytecount */
System.arraycopy (b, off, buf, 3, len);
out.write (buf, 0, len);
}
public void close () throws IOException
{
byte[] buf = new byte[]
{
EOF, /* eof descriptor */
0x00, 0x00 /* no bytes */
};
out.write (buf, 0, 3);
super.close ();
}
}
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