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/*
* BlockOutputStream.java
* 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
*
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obliged to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
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>
*/
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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