CLI: Add in initial LayerData renderer

volatility3/cli/text_renderer.py

@@ -1,3 +1,5 @@
+from volatility3.framework.interfaces.layers import TranslationLayerInterface
+
 # This file is Copyright 2019 Volatility Foundation and licensed under the Volatility Software License 1.0
 # which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
 #
@@ -150,12 +152,67 @@ class LayerDataRenderer(CLITypeRenderer):
     """Renders a LayerData object into data/bytes"""
 
     def __init__(self):
+        self.context_byte_len = 0
+        self.width = 16
+        self.display_offset = False
+        self.display_hex = True
+        self.display_ascii = True
+
         def render(data: Union[interfaces.renderers.LayerData, BaseAbsentValue]):
             if isinstance(data, BaseAbsentValue):
                 # FIXME: Do something cleverer here
                 return ""
-            data = data.context.layers[data.layer_name].read(data.offset, data.length)
-            return " ".join(f"{b:02x}" for b in data)
+
+            layer = data.context.layers[data.layer_name]
+            # Map of the holes
+            error_bytes = set()
+            start_offset = data.offset - self.context_byte_len
+            end_offset = data.offset + data.length + self.context_byte_len
+            if isinstance(layer, interfaces.layers.TranslationLayerInterface):
+                error_bytes = set()
+                mapping = iter(layer.mapping(start_offset, end_offset, True))
+                current_map = next(mapping)
+                for i in range(start_offset, end_offset):
+                    # Run through the bytes, check if they're present
+                    offset, sublength, _, _, _ = current_map
+                    if i < offset:
+                        error_bytes.add(i - start_offset)
+                    if i > offset + sublength:
+                        try:
+                            current_map = next(mapping)
+                        except StopIteration:
+                            pass
+                        offset, sublength, _, _, _ = current_map
+                    if i > offset + sublength:
+                        error_bytes.add(i - start_offset)
+
+            # Padded data
+            specific_data = data.context.layers[data.layer_name].read(
+                start_offset,
+                end_offset - start_offset,
+                True,
+            )
+
+            printables = ""
+            output = "\n"
+            for count, byte in enumerate(specific_data):
+                output += f"{byte:02x} "
+                char = chr(byte)
+                printables += char if 0x20 <= byte <= 0x7E else "."
+                if count % self.width == self.width - 1:
+                    output += printables
+                    if count < len(specific_data) - 1:
+                        output += "\n"
+                    printables = ""
+
+            # Handle leftovers when the length is not mutiple of width
+            if printables:
+                padding = self.width - len(printables)
+                output += "   " * padding
+                output += printables
+                output += " " * padding
+
+            return output
 
         render_func = render
         return super().__init__(render_func)