diff --git a/Tools/bgen/bgen/bgenHeapBuffer.py b/Tools/bgen/bgen/bgenHeapBuffer.py
index 002a2606f6e..d677f291848 100644
--- a/Tools/bgen/bgen/bgenHeapBuffer.py
+++ b/Tools/bgen/bgen/bgenHeapBuffer.py
@@ -111,3 +111,32 @@ class VarVarHeapOutputBufferType(VarHeapOutputBufferType):
 
     def passOutput(self, name):
         return "%s__out__, %s__len__, &%s__len__" % (name, name, name)
+        
+class MallocHeapOutputBufferType(HeapOutputBufferType):
+    """Output buffer allocated by the called function -- passed as (&buffer, &size).
+    
+    Instantiate without parameters.
+    Call from Python without parameters.
+    """
+
+    def getargsCheck(self, name):
+        Output("%s__out__ = NULL;", name)
+
+    def getAuxDeclarations(self, name):
+        return []
+        
+    def passOutput(self, name):
+        return "&%s__out__, &%s__len__" % (name, name)
+
+    def getargsFormat(self):
+        return ""
+
+    def getargsArgs(self, name):
+        return None
+        
+    def mkvalueFormat(self):
+        return "z#"
+        
+    def cleanup(self, name):
+        Output("if( %s__out__ ) free(%s__out__);", name, name)
+