114 lines
2.5 KiB
C++
114 lines
2.5 KiB
C++
//
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// Copyright (C) 2002 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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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#ifdef _WIN32
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#include <winsock.h>
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#define write(s,b,l) send(s,(const char*)b,l,0)
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#undef errno
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#define errno WSAGetLastError()
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#else
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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 bufSize_)
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: fd(fd_), 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::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 = write(fd, dataPtr, length);
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if (n < 0) throw SystemException("write",errno);
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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 = write(fd, (const void*) sentUpTo, ptr - sentUpTo);
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if (n < 0) throw SystemException("write",errno);
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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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