Add in an appropriate requirement for BufferLayers.

volatility/framework/configuration/depresolver.py

@@ -63,7 +63,7 @@ class DependencyResolver(validity.ValidityRoutines):
                         break
                 else:
                     logging.debug(
-                        "Unable to fulfill requirement " + repr(node.requirement) + " - no fulfillable candidates")
+                            "Unable to fulfill requirement " + repr(node.requirement) + " - no fulfillable candidates")
                     return False
             try:
                 value = context.config[node_path]

volatility/framework/configuration/requirements.py

@@ -18,6 +18,10 @@ class StringRequirement(InstanceRequirement):
     instance_type = str
 
 
+class BytesRequirement(InstanceRequirement):
+    instance_type = bytes
+
+
 class TranslationLayerRequirement(config_interface.ConstraintInterface):
     """Class maintaining the limitations on what sort of address spaces are acceptable"""
 

volatility/framework/layers/physical.py

@@ -6,8 +6,8 @@ Created on 6 May 2013
 
 import os.path
 
-import volatility.framework.configuration.requirements
-from volatility.framework import interfaces, exceptions, configuration
+from volatility.framework import interfaces, exceptions
+from volatility.framework.configuration import requirements
 
 
 class BufferDataLayer(interfaces.layers.DataLayerInterface):
@@ -48,7 +48,8 @@ class BufferDataLayer(interfaces.layers.DataLayerInterface):
     @classmethod
     def get_schema(cls):
         # No real requirements (only the buffer).  Need to figure out if there's a better way of representing this
-        return []
+        return [requirements.BytesRequirement(name = 'buffer', description = "The direct bytes to interact with",
+                                              optional = False)]
 
 
 class FileLayer(interfaces.layers.DataLayerInterface):
@@ -110,4 +111,4 @@ class FileLayer(interfaces.layers.DataLayerInterface):
 
     @classmethod
     def get_schema(cls):
-        return [volatility.framework.configuration.requirements.StringRequirement(name = 'filename', optional = False)]
+        return [requirements.StringRequirement(name = 'filename', optional = False)]