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- /* Copyright (C) 2002-2005 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.
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <stdio.h>
- #include <string.h>
- #include <errno.h>
- #include <sys/time.h>
- #ifdef _WIN32
- #include <winsock2.h>
- #define close closesocket
- #undef errno
- #define errno WSAGetLastError()
- #include <os/winerrno.h>
- #else
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <unistd.h>
- #endif
-
- /* Old systems have select() in sys/time.h */
- #ifdef HAVE_SYS_SELECT_H
- #include <sys/select.h>
- #endif
-
- #include <rdr/FdInStream.h>
- #include <rdr/Exception.h>
-
- using namespace rdr;
-
- FdInStream::FdInStream(int fd_, bool closeWhenDone_)
- : fd(fd_), closeWhenDone(closeWhenDone_)
- {
- }
-
- FdInStream::~FdInStream()
- {
- if (closeWhenDone) close(fd);
- }
-
-
- bool FdInStream::fillBuffer(size_t maxSize)
- {
- size_t n = readFd((U8*)end, maxSize);
- if (n == 0)
- return false;
- end += n;
-
- return true;
- }
-
- //
- // readFd() reads up to the given length in bytes from the
- // file descriptor into a buffer. Zero is
- // returned if no bytes can be read. Otherwise it returns the number of bytes read. It
- // never attempts to recv() unless select() indicates that the fd is readable -
- // 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 recv()
- // returning EINTR.
- //
-
- size_t FdInStream::readFd(void* buf, size_t len)
- {
- int n;
- do {
- fd_set fds;
- struct timeval tv;
-
- tv.tv_sec = tv.tv_usec = 0;
-
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
- n = select(fd+1, &fds, 0, 0, &tv);
- } while (n < 0 && errno == EINTR);
-
- if (n < 0)
- throw SystemException("select",errno);
-
- if (n == 0)
- return 0;
-
- do {
- n = ::recv(fd, (char*)buf, len, 0);
- } while (n < 0 && errno == EINTR);
-
- if (n < 0)
- throw SystemException("read",errno);
- if (n == 0)
- throw EndOfStream();
-
- return n;
- }
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