Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

Sources/OpenVPN3/openvpn/buffer/bufstream.hpp

@@ -0,0 +1,83 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    This program 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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef OPENVPN_BUFFER_BUFSTREAM_H
+#define OPENVPN_BUFFER_BUFSTREAM_H
+
+#include <streambuf>
+
+#include <openvpn/buffer/buffer.hpp>
+
+namespace openvpn {
+
+  class BufferStream : public std::streambuf
+  {
+  public:
+    BufferStream(Buffer& buffer) : buf(buffer) {}
+
+  protected:
+#if 0 // not implemented yet
+    // input
+    virtual std::streamsize showmanyc();
+    virtual std::streamsize xsgetn(char* s, std::streamsize n);
+    virtual int underflow();
+    virtual int uflow();
+    virtual int pbackfail(int c = EOF);
+#endif
+
+    // output
+    virtual std::streamsize xsputn(const char* s, std::streamsize n)
+    {
+      buf.write((unsigned char *)s, (size_t)n);
+      return n;
+    }
+
+    virtual int overflow(int c = EOF)
+    {
+      if (c != EOF)
+	{
+	  unsigned char uc = (unsigned char)c;
+	  buf.push_back(uc);
+	}
+      return c;
+    }
+
+  private:
+    Buffer& buf;
+  };
+
+  class BufferStreamOut : public std::ostream
+  {
+  public:
+    BufferStreamOut(Buffer& buffer)
+      : std::ostream(new BufferStream(buffer))
+    {
+    }
+
+    ~BufferStreamOut()
+    {
+      delete rdbuf();
+    }
+  };
+
+}
+
+#endif