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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2011 Pierre Ossman for Cendio AB
* Copyright (C) 2012-2019 Brian P. Hinz
*
* This 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.
*
* This software 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 software; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
package com.tigervnc.rdr;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import com.tigervnc.network.*;
public class FdOutStream extends OutStream {
static final int DEFAULT_BUF_SIZE = 16384;
static final int minBulkSize = 1024;
public FdOutStream(FileDescriptor fd_, boolean blocking_, int timeoutms_, int bufSize_)
{
fd = fd_; blocking = blocking_; timeoutms = timeoutms_;
bufSize = ((bufSize_ > 0) ? bufSize_ : DEFAULT_BUF_SIZE);
b = new byte[bufSize];
offset = 0;
ptr = sentUpTo = start = 0;
end = start + bufSize;
lastWrite = System.currentTimeMillis();
}
public FdOutStream(FileDescriptor fd_) { this(fd_, true, -1, 0); }
public void setTimeout(int timeoutms_) {
timeoutms = timeoutms_;
}
public void setBlocking(boolean blocking_) {
blocking = blocking_;
}
public int length()
{
return offset + ptr - sentUpTo;
}
int bufferUsage()
{
return ptr - sentUpTo;
}
long getIdleTime()
{
return System.currentTimeMillis()-lastWrite;
}
public void flush()
{
while (sentUpTo < ptr) {
int n = writeWithTimeout(b, sentUpTo,
ptr - sentUpTo,
blocking ? timeoutms : 0);
// Timeout?
if (n == 0) {
// If non-blocking then we're done here
if (!blocking)
break;
throw new TimedOut();
}
sentUpTo += n;
offset += n;
}
// Managed to flush everything?
if (sentUpTo == ptr)
ptr = sentUpTo = start;
}
protected int overrun(int itemSize, int nItems)
{
if (itemSize > bufSize)
throw new Exception("FdOutStream overrun: max itemSize exceeded");
// First try to get rid of the data we have
flush();
// Still not enough space?
if (itemSize > end - ptr) {
// Can we shuffle things around?
// (don't do this if it gains us less than 25%)
if ((sentUpTo - start > bufSize / 4) &&
(itemSize < bufSize - (ptr - sentUpTo))) {
System.arraycopy(b, ptr, b, start, ptr - sentUpTo);
ptr = start + (ptr - sentUpTo);
sentUpTo = start;
} else {
// Have to get rid of more data, so turn off non-blocking
// for a bit...
boolean realBlocking;
realBlocking = blocking;
blocking = true;
flush();
blocking = realBlocking;
}
}
int nAvail;
nAvail = (end - ptr) / itemSize;
if (nAvail < nItems)
return nAvail;
return nItems;
}
private int writeWithTimeout(byte[] data, int dataPtr, int length, int timeoutms)
{
int n;
do {
Integer tv;
if (timeoutms != -1) {
tv = new Integer(timeoutms);
} else {
tv = null;
}
try {
n = fd.select(SelectionKey.OP_WRITE, tv);
} catch (java.lang.Exception e) {
System.out.println(e.toString());
throw new Exception(e.getMessage());
}
} while (n < 0);
if (n == 0) return 0;
try {
n = fd.write(ByteBuffer.wrap(data, dataPtr, length), length);
} catch (java.lang.Exception e) {
throw new Exception(e.getMessage());
}
lastWrite = System.currentTimeMillis();
return n;
}
public FileDescriptor getFd() {
return fd;
}
public void setFd(FileDescriptor fd_) {
fd = fd_;
}
public int getBufSize() {
return bufSize;
}
protected FileDescriptor fd;
protected boolean blocking;
protected int timeoutms;
protected int start;
protected int sentUpTo;
protected int offset;
protected int bufSize;
private long lastWrite;
}
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