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Layers: Speed up qemu by not bisecting #586

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Dec 8, 2021
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Layers: Speed up qemu by not bisecting #586

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6 changes: 2 additions & 4 deletions volatility3/framework/layers/qemu.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
# This file is Copyright 2020 Volatility Foundation and licensed under the Volatility Software License 1.0
# which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
#
import bisect
import functools
import json
import math
Expand Down Expand Up @@ -218,9 +217,8 @@ def _decode_data(self, data: bytes, mapped_offset: int, offset: int, output_leng
of the starting data. It is the responsibility of the layer to turn the provided data chunk into the right
portion of data necessary.
"""
start_offset, _, start_mapped_offset, _ = self._segments[
bisect.bisect_right(self._segments, (offset, 0xffffffffffffff,)) - 1]
if start_mapped_offset in self._compressed:
start_offset = offset ^ (offset & 0xfff)
if start_offset in self._compressed:
data = (data * 0x1000)
result = data[offset - start_offset:output_length + offset - start_offset]
return result
Expand Down