rdr

1 files changed, 113 insertions, 0 deletions

diff --git a/rdr/FdOutStream.cxx b/rdr/FdOutStream.cxx
new file mode 100644
index 0000000..40e7ac0
--- /dev/null
+++ b/rdr/FdOutStream.cxx
@@ -0,0 +1,113 @@
+//
+// Copyright (C) 2002 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>
+#include <errno.h>
+#include <sys/types.h>
+#ifdef _WIN32
+#include <winsock.h>
+#define write(s,b,l) send(s,(const char*)b,l,0)
+#undef errno
+#define errno WSAGetLastError()
+#else
+#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 bufSize_)
+  : fd(fd_), 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::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 = write(fd, dataPtr, length);
+
+    if (n < 0) throw SystemException("write",errno);
+
+    length -= n;
+    dataPtr += n;
+    offset += n;
+  }
+}
+
+int FdOutStream::length()
+{
+  return offset + ptr - start;
+}
+
+void FdOutStream::flush()
+{
+  U8* sentUpTo = start;
+  while (sentUpTo < ptr) {
+    int n = write(fd, (const void*) sentUpTo, ptr - sentUpTo);
+
+    if (n < 0) throw SystemException("write",errno);
+
+    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;
+}