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

Sources/OpenVPN3/openvpn/buffer/memq.hpp

@@ -0,0 +1,96 @@
+//    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/>.
+
+// A queue of buffers, implemented as std::deque<BufferPtr>.
+
+#ifndef OPENVPN_BUFFER_MEMQ_H
+#define OPENVPN_BUFFER_MEMQ_H
+
+#include <deque>
+
+#include <openvpn/common/size.hpp>
+#include <openvpn/buffer/buffer.hpp>
+
+namespace openvpn {
+
+  class MemQBase
+  {
+  public:
+    MemQBase() : length(0) {}
+
+    size_t size() const
+    {
+      return q.size();
+    }
+
+    bool empty() const
+    {
+      return q.empty();
+    }
+
+    size_t total_length() const { return length; }
+
+    void clear()
+    {
+      while (!q.empty())
+	q.pop_back();
+      length = 0;
+    }
+
+    void write_buf(const BufferPtr& bp)
+    {
+      q.push_back(bp);
+      length += bp->size();
+    }
+
+    BufferPtr read_buf()
+    {
+      BufferPtr ret = q.front();
+      q.pop_front();
+      length -= ret->size();
+      return ret;
+    }
+
+    BufferPtr& peek()
+    {
+      return q.front();
+    }
+
+    void pop()
+    {
+      length -= q.front()->size();
+      q.pop_front();
+    }
+
+    void resize(const size_t cap)
+    {
+      q.resize(cap);
+    }
+
+  protected:
+    typedef std::deque<BufferPtr> q_type;
+    size_t length;
+    q_type q;
+  };
+
+} // namespace openvpn
+
+#endif // OPENVPN_BUFFER_MEMQ_H