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- /* Copyright (C) 2002-2003 RealVNC Ltd. All Rights Reserved.
- *
- * 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.
- */
-
- #include <stdio.h>
- #include <string.h>
- #ifdef _WIN32
- #include <winsock2.h>
- #define write(s,b,l) send(s,(const char*)b,l,0)
- #define EWOULDBLOCK WSAEWOULDBLOCK
- #undef errno
- #define errno WSAGetLastError()
- #undef EINTR
- #define EINTR WSAEINTR
- #else
- #include <sys/types.h>
- #include <errno.h>
- #include <unistd.h>
- #include <sys/time.h>
- #endif
-
- #include <rdr/FdOutStream.h>
- #include <rdr/Exception.h>
-
-
- using namespace rdr;
-
- enum { DEFAULT_BUF_SIZE = 16384,
- MIN_BULK_SIZE = 1024 };
-
- FdOutStream::FdOutStream(int fd_, int timeoutms_, int bufSize_)
- : fd(fd_), timeoutms(timeoutms_),
- bufSize(bufSize_ ? bufSize_ : DEFAULT_BUF_SIZE), offset(0)
- {
- ptr = start = new U8[bufSize];
- end = start + bufSize;
- }
-
- FdOutStream::~FdOutStream()
- {
- try {
- flush();
- } catch (Exception&) {
- }
- delete [] start;
- }
-
- void FdOutStream::setTimeout(int timeoutms_) {
- timeoutms = timeoutms_;
- }
-
- void FdOutStream::writeBytes(const void* data, int length)
- {
- if (length < MIN_BULK_SIZE) {
- OutStream::writeBytes(data, length);
- return;
- }
-
- const U8* dataPtr = (const U8*)data;
-
- flush();
-
- while (length > 0) {
- int n = writeWithTimeout(dataPtr, length);
- length -= n;
- dataPtr += n;
- offset += n;
- }
- }
-
- int FdOutStream::length()
- {
- return offset + ptr - start;
- }
-
- void FdOutStream::flush()
- {
- U8* sentUpTo = start;
- while (sentUpTo < ptr) {
- int n = writeWithTimeout((const void*) sentUpTo, ptr - sentUpTo);
- sentUpTo += n;
- offset += n;
- }
-
- ptr = start;
- }
-
-
- int FdOutStream::overrun(int itemSize, int nItems)
- {
- if (itemSize > bufSize)
- throw Exception("FdOutStream overrun: max itemSize exceeded");
-
- flush();
-
- if (itemSize * nItems > end - ptr)
- nItems = (end - ptr) / itemSize;
-
- return nItems;
- }
-
- //
- // writeWithTimeout() writes up to the given length in bytes from the given
- // buffer to the file descriptor. If there is a timeout set and that timeout
- // expires, it throws a TimedOut exception. Otherwise it returns the number of
- // bytes written. It never attempts to write() unless select() indicates that
- // the fd is writable - this means it can be used on an fd which has been set
- // non-blocking. It also has to cope with the annoying possibility of both
- // select() and write() returning EINTR.
- //
-
- int FdOutStream::writeWithTimeout(const void* data, int length)
- {
- int n;
-
- do {
-
- do {
- fd_set fds;
- struct timeval tv;
- struct timeval* tvp = &tv;
-
- if (timeoutms != -1) {
- tv.tv_sec = timeoutms / 1000;
- tv.tv_usec = (timeoutms % 1000) * 1000;
- } else {
- tvp = 0;
- }
-
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
- #ifdef _WIN32_WCE
- // NB: This fixes a broken Winsock2 select() behaviour. select()
- // never returns for non-blocking sockets, unless they're already
- // ready to be written to...
- u_long zero = 0; ioctlsocket(fd, FIONBIO, &zero);
- #endif
- n = select(fd+1, 0, &fds, 0, tvp);
- #ifdef _WIN32_WCE
- u_long one = 0; ioctlsocket(fd, FIONBIO, &one);
- #endif
- } while (n < 0 && errno == EINTR);
-
- if (n < 0) throw SystemException("select",errno);
-
- if (n == 0) throw TimedOut();
-
- do {
- n = ::write(fd, data, length);
- } while (n < 0 && (errno == EINTR));
-
- // NB: This outer loop simply fixes a broken Winsock2 EWOULDBLOCK
- // condition, found only under Win98 (first edition), with slow
- // network connections. Should in fact never ever happen...
- } while (n < 0 && (errno == EWOULDBLOCK));
-
- if (n < 0) throw SystemException("write",errno);
-
- return n;
- }
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