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62 lines
2.3 KiB
Python
62 lines
2.3 KiB
Python
"""
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Created on 4 May 2013
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@author: mike
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"""
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from volatility.framework import validity, interfaces, exceptions
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from volatility.framework.layers import physical, intel
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class Memory(validity.ValidityRoutines):
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"""Container for multiple layers of data"""
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def __init__(self):
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self._layers = {}
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def read(self, layer, offset, length, pad = False):
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"""Reads from a particular layer at offset for length bytes
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Returns 'bytes' not 'str'
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"""
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return self[layer].read(offset, length, pad)
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def write(self, layer, offset, data):
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"""Writes to a particular layer at offset for length bytes"""
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self[layer].write(offset, data)
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def add_layer(self, layer):
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"""Adds a layer to memory model
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This will throw an exception if the required dependencies are not met
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"""
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self._type_check(layer, interfaces.layers.DataLayerInterface)
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if isinstance(layer, interfaces.layers.TranslationLayerInterface):
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if layer.name in self._layers:
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raise exceptions.LayerException("Layer " + layer.name + " already exists.")
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missing_list = [sublayer for sublayer in layer.dependencies if sublayer not in self._layers]
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if missing_list:
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raise exceptions.LayerException("Layer " + layer.name +
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" has unmet dependencies of " + ", ".join(missing_list + "."))
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self._layers[layer.name] = layer
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def del_layer(self, name):
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"""Removes the layer called name
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This will throw an exception if other layers depend upon this layer
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"""
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for layer in self._layers:
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depend_list = [superlayer for superlayer in self._layers if name in superlayer.dependencies]
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if depend_list:
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raise exceptions.LayerException("Layer " + layer.name +
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" is depended upon by " + ", ".join(depend_list))
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del self._layers[name]
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def __getitem__(self, name):
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"""Returns the layer of specified name"""
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return self._layers[name]
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def check_cycles(self):
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"""Runs through the available layers and identifies if there are cycles in the DAG"""
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# TODO: Is having a cycle check necessary?
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