Tap driver basically builds in VS2012... fork of tap-windows from OpenVPN (compatible license).

vsprojects/TapDriver/mem.c

@@ -0,0 +1,186 @@
+/*
+ *  TAP-Windows -- A kernel driver to provide virtual tap
+ *                 device functionality on Windows.
+ *
+ *  This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
+ *
+ *  This source code is Copyright (C) 2002-2010 OpenVPN Technologies, Inc.,
+ *  and is released under the GPL version 2 (see below).
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+//------------------
+// Memory Management
+//------------------
+
+PVOID
+MemAlloc (ULONG p_Size, BOOLEAN zero)
+{
+  PVOID l_Return = NULL;
+
+  if (p_Size)
+    {
+      __try
+      {
+	if (NdisAllocateMemoryWithTag (&l_Return, p_Size, 'APAT')
+	    == NDIS_STATUS_SUCCESS)
+	  {
+	    if (zero)
+	      NdisZeroMemory (l_Return, p_Size);
+	  }
+	else
+	  l_Return = NULL;
+      }
+      __except (EXCEPTION_EXECUTE_HANDLER)
+      {
+	l_Return = NULL;
+      }
+    }
+
+  return l_Return;
+}
+
+VOID
+MemFree (PVOID p_Addr, ULONG p_Size)
+{
+  if (p_Addr && p_Size)
+    {
+      __try
+      {
+#if DBG
+	NdisZeroMemory (p_Addr, p_Size);
+#endif
+	NdisFreeMemory (p_Addr, p_Size, 0);
+      }
+      __except (EXCEPTION_EXECUTE_HANDLER)
+      {
+      }
+    }
+}
+
+/*
+ * Circular queue management routines.
+ */
+
+#define QUEUE_BYTE_ALLOCATION(size) \
+  (sizeof (Queue) + (size * sizeof (PVOID)))
+
+#define QUEUE_ADD_INDEX(var, inc) \
+{ \
+  var += inc; \
+  if (var >= q->capacity) \
+    var -= q->capacity; \
+  MYASSERT (var < q->capacity); \
+}
+
+#define QUEUE_SANITY_CHECK() \
+  MYASSERT (q != NULL && q->base < q->capacity && q->size <= q->capacity)
+
+#define QueueCount(q) (q->size)
+
+#define UPDATE_MAX_SIZE() \
+{ \
+  if (q->size > q->max_size) \
+    q->max_size = q->size; \
+}
+
+Queue *
+QueueInit (ULONG capacity)
+{
+  Queue *q;
+
+  MYASSERT (capacity > 0);
+  q = (Queue *) MemAlloc (QUEUE_BYTE_ALLOCATION (capacity), TRUE);
+  if (!q)
+    return NULL;
+
+  q->base = q->size = 0;
+  q->capacity = capacity;
+  q->max_size = 0;
+  return q;
+}
+
+VOID
+QueueFree (Queue *q)
+{
+  if (q)
+    {
+      QUEUE_SANITY_CHECK ();
+      MemFree (q, QUEUE_BYTE_ALLOCATION (q->capacity));
+    }
+}
+
+PVOID
+QueuePush (Queue *q, PVOID item)
+{
+  ULONG dest;
+  QUEUE_SANITY_CHECK ();
+  if (q->size == q->capacity)
+    return NULL;
+  dest = q->base;
+  QUEUE_ADD_INDEX (dest, q->size);
+  q->data[dest] = item;
+  ++q->size;
+  UPDATE_MAX_SIZE();
+  return item;
+}
+
+PVOID
+QueuePop (Queue *q)
+{
+  ULONG oldbase;
+  QUEUE_SANITY_CHECK ();
+  if (!q->size)
+    return NULL;
+  oldbase = q->base;
+  QUEUE_ADD_INDEX (q->base, 1);
+  --q->size;
+  UPDATE_MAX_SIZE();
+  return q->data[oldbase];
+}
+
+PVOID
+QueueExtract (Queue *q, PVOID item)
+{
+  ULONG src, dest, count, n;
+  QUEUE_SANITY_CHECK ();
+  n = 0;
+  src = dest = q->base;
+  count = q->size;
+  while (count--)
+    {
+      if (item == q->data[src])
+	{
+	  ++n;
+	  --q->size;
+	}
+      else
+	{
+	  q->data[dest] = q->data[src];
+	  QUEUE_ADD_INDEX (dest, 1);	  
+	}
+      QUEUE_ADD_INDEX (src, 1);
+    }
+  if (n)
+    return item;
+  else
+    return NULL;
+}
+
+#undef QUEUE_BYTE_ALLOCATION
+#undef QUEUE_ADD_INDEX
+#undef QUEUE_SANITY_CHECK
+#undef UPDATE_MAX_SIZE