175 lines
4.2 KiB
C++
175 lines
4.2 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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#define write(s,b,l) send(s,(const char*)b,l,0)
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#define EWOULDBLOCK WSAEWOULDBLOCK
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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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#include <rdr/FdOutStream.h>
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#include <rdr/Exception.h>
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using namespace rdr;
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enum { DEFAULT_BUF_SIZE = 16384,
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MIN_BULK_SIZE = 1024 };
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FdOutStream::FdOutStream(int fd_, int timeoutms_, int bufSize_)
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: fd(fd_), timeoutms(timeoutms_),
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bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
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{
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ptr = start = new U8[bufSize];
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end = start + bufSize;
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}
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FdOutStream::~FdOutStream()
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{
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try {
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flush();
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} catch (Exception&) {
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}
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delete [] start;
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}
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void FdOutStream::setTimeout(int timeoutms_) {
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timeoutms = timeoutms_;
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}
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void FdOutStream::writeBytes(const void* data, int length)
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{
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if (length < MIN_BULK_SIZE) {
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OutStream::writeBytes(data, length);
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return;
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}
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const U8* dataPtr = (const U8*)data;
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flush();
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while (length > 0) {
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int n = writeWithTimeout(dataPtr, length);
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length -= n;
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dataPtr += n;
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offset += n;
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}
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}
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int FdOutStream::length()
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{
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return offset + ptr - start;
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}
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void FdOutStream::flush()
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{
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U8* sentUpTo = start;
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while (sentUpTo < ptr) {
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int n = writeWithTimeout((const void*) sentUpTo, ptr - sentUpTo);
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sentUpTo += n;
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offset += n;
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}
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ptr = start;
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}
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int FdOutStream::overrun(int itemSize, int nItems)
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{
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if (itemSize > bufSize)
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throw Exception("FdOutStream overrun: max itemSize exceeded");
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flush();
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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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//
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// writeWithTimeout() writes up to the given length in bytes from the given
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// buffer to the file descriptor. If there is a timeout set and that timeout
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// expires, it throws a TimedOut exception. Otherwise it returns the number of
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// bytes written. It never attempts to write() unless select() indicates that
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// the fd is writable - this means it can be used on an fd which has been set
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// non-blocking. It also has to cope with the annoying possibility of both
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// select() and write() returning EINTR.
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//
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int FdOutStream::writeWithTimeout(const void* data, int length)
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{
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int n;
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do {
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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 (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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#ifdef _WIN32_WCE
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// NB: This fixes a broken Winsock2 select() behaviour. select()
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// never returns for non-blocking sockets, unless they're already
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// ready to be written to...
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u_long zero = 0; ioctlsocket(fd, FIONBIO, &zero);
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#endif
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n = select(fd+1, 0, &fds, 0, tvp);
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#ifdef _WIN32_WCE
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u_long one = 0; ioctlsocket(fd, FIONBIO, &one);
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#endif
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} while (n < 0 && errno == EINTR);
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if (n < 0) throw SystemException("select",errno);
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if (n == 0) throw TimedOut();
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do {
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n = ::write(fd, data, length);
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} while (n < 0 && (errno == EINTR));
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// NB: This outer loop simply fixes a broken Winsock2 EWOULDBLOCK
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// condition, found only under Win98 (first edition), with slow
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// network connections. Should in fact never ever happen...
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} while (n < 0 && (errno == EWOULDBLOCK));
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if (n < 0) throw SystemException("write",errno);
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return n;
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}
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