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optionally pull byte histogram #16

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optionally pull byte histogram #16

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53b7f07
optionally pull byte histogram
cccs-dawson Jul 14, 2021
cfc4d46
remove unnuecessary assignment
cccs-dawson Jul 21, 2021
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23 changes: 21 additions & 2 deletions characterize.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import subprocess
import traceback
from typing import Dict, List, Optional, Tuple, Union
import array

import hachoir.core.config as hachoir_config
from hachoir.core.log import log as hachoir_logger, Log, Logger
Expand Down Expand Up @@ -127,10 +128,19 @@ def start(self) -> None:
def execute(self, request: ServiceRequest) -> None:
request.result = Result()

# 1. Calculate entropy map
with open(request.file_path, 'rb') as fin:
# 1. Calculate entropy map
(entropy, part_entropies) = calculate_partition_entropy(fin)

# 2. Optionally get byte histogram
get_byte_histogram = self.config.get("get_entropy_histogram", False)
if get_byte_histogram:
fin.seek(0)
file_bytes = fin.read()
histogram = array.array('L', [0] * 256)
for byte in file_bytes:
histogram[byte] += 1

entropy_graph_data = {
'type': 'colormap',
'data': {
Expand All @@ -139,9 +149,18 @@ def execute(self, request: ServiceRequest) -> None:
}
}

ResultSection(f"File entropy: {round(entropy, 3)}", parent=request.result, body_format=BODY_FORMAT.GRAPH_DATA,
entropy_sec = ResultSection(f"File entropy: {round(entropy, 3)}", parent=request.result, body_format=BODY_FORMAT.GRAPH_DATA,
body=json.dumps(entropy_graph_data))

if get_byte_histogram:
histogram_data = { 'entropy_byte_histogram' : histogram.tolist() }
histo_subsec = ResultSection(
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'File Byte Histogram',
body_format=BODY_FORMAT.KEY_VALUE,
body=histogram_data,
parent=entropy_sec
)

if request.file_type == "meta/shortcut/windows":
# 2. Parse windows shortcuts
self.parse_link(request.result, request.file_path)
Expand Down