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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 errorNumber WSAGetLastError()
#define close closesocket
#include <os/winerrno.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#define errorNumber errno
#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 n = readFd((uint8_t*)end, availSpace());
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(uint8_t* 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, nullptr, nullptr, &tv);
} while (n < 0 && errorNumber == EINTR);
if (n < 0)
throw SystemException("select", errorNumber);
if (n == 0)
return 0;
do {
n = ::recv(fd, (char*)buf, len, 0);
} while (n < 0 && errorNumber == EINTR);
if (n < 0)
throw SystemException("read", errorNumber);
if (n == 0)
throw EndOfStream();
return n;
}
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