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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2012 TigerVnc Team
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
package com.tigervnc.rdr;
import com.tigervnc.network.*;
import java.nio.channels.SelectionKey;
public class FdOutStream extends OutStream {
static final int defaultBufSize = 16384;
static final int minBulkSize = 1024;
public FdOutStream(FileDescriptor fd_, boolean blocking_, int timeoutms_, int bufSize_)
{
fd = fd_;
blocking = blocking_;
timeoutms = timeoutms_;
bufSize = bufSize_;
b = new byte[bufSize];
offset = 0;
ptr = sentUpTo = start = 0;
end = start + bufSize;
}
public FdOutStream(FileDescriptor fd_) { this(fd_, false, 0, defaultBufSize); }
public void setTimeout(int timeoutms_) {
timeoutms = timeoutms_;
}
public void setBlocking(boolean blocking_) {
blocking = blocking_;
}
public int length()
{
return offset + ptr - sentUpTo;
}
public void flush()
{
int timeoutms_;
if (blocking)
timeoutms_ = timeoutms;
else
timeoutms_ = 0;
while (sentUpTo < ptr) {
int n = writeWithTimeout(b, sentUpTo, ptr - sentUpTo, timeoutms_);
// Timeout?
if (n == 0) {
// If non-blocking then we're done here
if (!blocking)
break;
// Otherwise try blocking (with possible timeout)
if ((timeoutms_ == 0) && (timeoutms != 0)) {
timeoutms_ = timeoutms;
break;
}
// Proper timeout
throw new TimedOut();
}
sentUpTo += n;
offset += n;
}
// Managed to flush everything?
if (sentUpTo == ptr)
ptr = sentUpTo = start;
}
private int writeWithTimeout(byte[] data, int dataPtr, int length, int timeoutms)
{
int timeout;
int n;
do {
if (timeoutms != -1) {
timeout = timeoutms;
} else {
timeout = 0;
}
try {
n = fd.select(SelectionKey.OP_WRITE, timeout);
} catch (java.lang.Exception e) {
System.out.println(e.toString());
throw new Exception(e.toString());
}
} while (n < 0);
try {
n = fd.write(data, dataPtr, length);
} catch (java.lang.Exception e) {
throw new Exception(e.toString());
}
return n;
}
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;
}
}
// Can we fit all the items asked for?
if (itemSize * nItems > end - ptr)
nItems = (end - ptr) / itemSize;
return nItems;
}
public FileDescriptor getFd() {
return fd;
}
public void setFd(FileDescriptor fd_) {
fd = fd_;
}
protected FileDescriptor fd;
protected boolean blocking;
protected int timeoutms;
protected int start;
protected int sentUpTo;
protected int offset;
protected int bufSize;
}
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