284 lines
7.2 KiB
C++
284 lines
7.2 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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#include <stdio.h>
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#include <string.h>
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#ifdef _WIN32
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#include <winsock2.h>
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#ifndef _WIN32_WCE
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#include <sys/timeb.h>
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#endif
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#define read(s,b,l) recv(s,(char*)b,l,0)
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#define close closesocket
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#undef errno
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#define errno WSAGetLastError()
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#undef EINTR
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#define EINTR WSAEINTR
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#else
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#include <sys/types.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/time.h>
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#endif
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// XXX should use autoconf HAVE_SYS_SELECT_H
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#ifdef _AIX
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#include <sys/select.h>
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#endif
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#include <rdr/FdInStream.h>
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#include <rdr/Exception.h>
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#pragma warning(disable: 4244)
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using namespace rdr;
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enum { DEFAULT_BUF_SIZE = 8192,
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MIN_BULK_SIZE = 1024 };
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FdInStream::FdInStream(int fd_, int timeoutms_, int bufSize_,
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bool closeWhenDone_)
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: fd(fd_), closeWhenDone(closeWhenDone_),
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timeoutms(timeoutms_), blockCallback(0),
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timing(false), timeWaitedIn100us(5), timedKbits(0),
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bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
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{
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ptr = end = start = new U8[bufSize];
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}
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FdInStream::FdInStream(int fd_, FdInStreamBlockCallback* blockCallback_,
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int bufSize_)
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: fd(fd_), timeoutms(0), blockCallback(blockCallback_),
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timing(false), timeWaitedIn100us(5), timedKbits(0),
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bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
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{
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ptr = end = start = new U8[bufSize];
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}
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FdInStream::~FdInStream()
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{
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delete [] start;
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if (closeWhenDone) close(fd);
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}
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void FdInStream::setTimeout(int timeoutms_) {
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timeoutms = timeoutms_;
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}
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void FdInStream::setBlockCallback(FdInStreamBlockCallback* blockCallback_)
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{
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blockCallback = blockCallback_;
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timeoutms = 0;
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}
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int FdInStream::pos()
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{
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return offset + ptr - start;
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}
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void FdInStream::readBytes(void* data, int length)
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{
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if (length < MIN_BULK_SIZE) {
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InStream::readBytes(data, length);
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return;
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}
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U8* dataPtr = (U8*)data;
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int n = end - ptr;
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if (n > length) n = length;
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memcpy(dataPtr, ptr, n);
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dataPtr += n;
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length -= n;
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ptr += n;
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while (length > 0) {
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n = readWithTimeoutOrCallback(dataPtr, length);
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dataPtr += n;
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length -= n;
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offset += n;
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}
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}
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int FdInStream::overrun(int itemSize, int nItems, bool wait)
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{
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if (itemSize > bufSize)
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throw Exception("FdInStream overrun: max itemSize exceeded");
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if (end - ptr != 0)
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memmove(start, ptr, end - ptr);
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offset += ptr - start;
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end -= ptr - start;
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ptr = start;
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while (end < start + itemSize) {
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int n = readWithTimeoutOrCallback((U8*)end, start + bufSize - end, wait);
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if (n == 0) return 0;
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end += n;
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}
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if (itemSize * nItems > end - ptr)
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nItems = (end - ptr) / itemSize;
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return nItems;
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}
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#ifdef _WIN32
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static void gettimeofday(struct timeval* tv, void*)
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{
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LARGE_INTEGER counts, countsPerSec;
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static double usecPerCount = 0.0;
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if (QueryPerformanceCounter(&counts)) {
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if (usecPerCount == 0.0) {
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QueryPerformanceFrequency(&countsPerSec);
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usecPerCount = 1000000.0 / countsPerSec.QuadPart;
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}
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LONGLONG usecs = (LONGLONG)(counts.QuadPart * usecPerCount);
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tv->tv_usec = (long)(usecs % 1000000);
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tv->tv_sec = (long)(usecs / 1000000);
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} else {
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#ifndef _WIN32_WCE
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struct timeb tb;
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ftime(&tb);
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tv->tv_sec = tb.time;
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tv->tv_usec = tb.millitm * 1000;
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#else
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throw SystemException("QueryPerformanceCounter", GetLastError());
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#endif
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}
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}
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#endif
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//
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// readWithTimeoutOrCallback() reads up to the given length in bytes from the
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// file descriptor into a buffer. If the wait argument is false, then zero is
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// returned if no bytes can be read without blocking. Otherwise if a
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// blockCallback is set, it will be called (repeatedly) instead of blocking.
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// If alternatively there is a timeout set and that timeout expires, it throws
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// a TimedOut exception. Otherwise it returns the number of bytes read. It
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// never attempts to read() unless select() indicates that the fd is readable -
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// this means it can be used on an fd which has been set non-blocking. It also
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// has to cope with the annoying possibility of both select() and read()
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// returning EINTR.
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//
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int FdInStream::readWithTimeoutOrCallback(void* buf, int len, bool wait)
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{
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struct timeval before, after;
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if (timing)
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gettimeofday(&before, 0);
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int n;
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while (true) {
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do {
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fd_set fds;
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struct timeval tv;
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struct timeval* tvp = &tv;
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if (!wait) {
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tv.tv_sec = tv.tv_usec = 0;
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} else if (timeoutms != -1) {
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tv.tv_sec = timeoutms / 1000;
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tv.tv_usec = (timeoutms % 1000) * 1000;
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} else {
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tvp = 0;
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}
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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n = select(fd+1, &fds, 0, 0, tvp);
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} while (n < 0 && errno == EINTR);
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if (n > 0) break;
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if (n < 0) throw SystemException("select",errno);
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if (!wait) return 0;
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if (!blockCallback) throw TimedOut();
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blockCallback->blockCallback();
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}
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do {
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n = ::read(fd, buf, len);
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} while (n < 0 && errno == EINTR);
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if (n < 0) throw SystemException("read",errno);
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if (n == 0) throw EndOfStream();
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if (timing) {
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gettimeofday(&after, 0);
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// fprintf(stderr,"%d.%06d\n",(after.tv_sec - before.tv_sec),
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// (after.tv_usec - before.tv_usec));
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int newTimeWaited = ((after.tv_sec - before.tv_sec) * 10000 +
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(after.tv_usec - before.tv_usec) / 100);
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int newKbits = n * 8 / 1000;
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// if (newTimeWaited == 0) {
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// fprintf(stderr,"new kbps infinite t %d k %d\n",
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// newTimeWaited, newKbits);
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// } else {
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// fprintf(stderr,"new kbps %d t %d k %d\n",
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// newKbits * 10000 / newTimeWaited, newTimeWaited, newKbits);
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// }
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// limit rate to between 10kbit/s and 40Mbit/s
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if (newTimeWaited > newKbits*1000) newTimeWaited = newKbits*1000;
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if (newTimeWaited < newKbits/4) newTimeWaited = newKbits/4;
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timeWaitedIn100us += newTimeWaited;
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timedKbits += newKbits;
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}
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return n;
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}
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void FdInStream::startTiming()
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{
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timing = true;
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// Carry over up to 1s worth of previous rate for smoothing.
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if (timeWaitedIn100us > 10000) {
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timedKbits = timedKbits * 10000 / timeWaitedIn100us;
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timeWaitedIn100us = 10000;
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}
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}
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void FdInStream::stopTiming()
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{
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timing = false;
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if (timeWaitedIn100us < timedKbits/2)
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timeWaitedIn100us = timedKbits/2; // upper limit 20Mbit/s
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}
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unsigned int FdInStream::kbitsPerSecond()
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{
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// The following calculation will overflow 32-bit arithmetic if we have
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// received more than about 50Mbytes (400Mbits) since we started timing, so
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// it should be OK for a single RFB update.
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return timedKbits * 10000 / timeWaitedIn100us;
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}
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