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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.Selector;
import java.nio.channels.SelectionKey;
import java.util.Set;
import java.util.Iterator;
public class FdInStream extends InStream {
static final int defaultBufSize = 8192;
static final int minBulkSize = 1024;
public FdInStream(FileDescriptor fd_, int bufSize_) {
fd = fd_;
bufSize = bufSize_;
b = new byte[bufSize];
ptr = end = offset = 0;
timeoutms = 0;
timing = false;
timeWaitedIn100us = 5;
timedKbits = 0;
}
public FdInStream(FileDescriptor fd_) { this(fd_, defaultBufSize); }
public final void readBytes(byte[] data, int dataPtr, int length) {
if (length < minBulkSize) {
super.readBytes(data, dataPtr, length);
return;
}
int n = end - ptr;
if (n > length) n = length;
System.arraycopy(b, ptr, data, dataPtr, n);
dataPtr += n;
length -= n;
ptr += n;
while (length > 0) {
n = readWithTimeoutOrCallback(data, dataPtr, length);
dataPtr += n;
length -= n;
offset += n;
}
}
public void setTimeout(int timeoutms_) {
timeoutms = timeoutms_;
}
public void setBlockCallback(FdInStreamBlockCallback blockCallback_)
{
blockCallback = blockCallback_;
timeoutms = 0;
}
public final int pos() { return offset + ptr; }
public final void startTiming() {
timing = true;
// Carry over up to 1s worth of previous rate for smoothing.
if (timeWaitedIn100us > 10000) {
timedKbits = timedKbits * 10000 / timeWaitedIn100us;
timeWaitedIn100us = 10000;
}
}
public final void stopTiming() {
timing = false;
if (timeWaitedIn100us < timedKbits/2)
timeWaitedIn100us = timedKbits/2; // upper limit 20Mbit/s
}
public final long kbitsPerSecond() {
return timedKbits * 10000 / timeWaitedIn100us;
}
public final long timeWaited() { return timeWaitedIn100us; }
protected int overrun(int itemSize, int nItems, boolean wait) {
if (itemSize > bufSize)
throw new Exception("FdInStream overrun: max itemSize exceeded");
if (end - ptr != 0)
System.arraycopy(b, ptr, b, 0, end - ptr);
offset += ptr;
end -= ptr;
ptr = 0;
int bytes_to_read;
while (end < itemSize) {
bytes_to_read = bufSize - end;
if (!timing) {
// When not timing, we must be careful not to read too much
// extra data into the buffer. Otherwise, the line speed
// estimation might stay at zero for a long time: All reads
// during timing=1 can be satisfied without calling
// readWithTimeoutOrCallback. However, reading only 1 or 2 bytes
// bytes is ineffecient.
bytes_to_read = Math.min(bytes_to_read, Math.max(itemSize*nItems, 8));
}
int n = readWithTimeoutOrCallback(b, end, bytes_to_read, wait);
if (n == 0) return 0;
end += n;
}
if (itemSize * nItems > end - ptr)
nItems = (end - ptr) / itemSize;
return nItems;
}
protected int readWithTimeoutOrCallback(byte[] buf, int bufPtr, int len, boolean wait) {
long before = 0;
long timeout;
if (timing)
before = System.nanoTime();
int n;
while (true) {
if (!wait) {
timeout = 0;
} else if (timeoutms != -1) {
timeout = (long)timeoutms;
} else {
timeout = 0;
}
try {
n = fd.select(SelectionKey.OP_READ, timeoutms);
} catch (Exception e) {
throw new SystemException("select:"+e.toString());
}
if (n > 0) break;
if (!wait) return 0;
if (blockCallback == null) throw new TimedOut();
blockCallback.blockCallback();
}
try {
n = fd.read(buf, bufPtr, len);
} catch (Exception e) {
throw new SystemException("read:"+e.toString());
}
if (n == 0) throw new EndOfStream();
if (timing) {
long after = System.nanoTime();
long newTimeWaited = (after - before) / 100000;
int newKbits = n * 8 / 1000;
// limit rate to between 10kbit/s and 40Mbit/s
if (newTimeWaited > newKbits*1000) {
newTimeWaited = newKbits*1000;
} else if (newTimeWaited < newKbits/4) {
newTimeWaited = newKbits/4;
}
timeWaitedIn100us += newTimeWaited;
timedKbits += newKbits;
}
return n;
}
private int readWithTimeoutOrCallback(byte[] buf, int bufPtr, int len) {
return readWithTimeoutOrCallback(buf, bufPtr, len, true);
}
public FileDescriptor getFd() {
return fd;
}
public void setFd(FileDescriptor fd_) {
fd = fd_;
}
private int offset;
private int bufSize;
private FileDescriptor fd;
private FdInStreamBlockCallback blockCallback;
protected int timeoutms;
protected boolean timing;
protected long timeWaitedIn100us;
protected long timedKbits;
}
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