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Small performance boost #84

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Merged
abelfodil merged 1 commit into from
Nov 19, 2020
Merged

Small performance boost #84

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6 changes: 5 additions & 1 deletion backend/classification/parser/sd_file.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,9 @@

ROWS_TO_SKIP = 2

SIGNED_BIT = int("800000", 16)
SIGNED_BIT_2 = 2 * SIGNED_BIT


def _hexstr_to_int(hexstr):
"""Converts a two complement hexadecimal value in a string to a signed float
Expand All @@ -14,7 +17,8 @@ def _hexstr_to_int(hexstr):
Returns:
- decimal value
"""
return int.from_bytes(bytes.fromhex(hexstr), byteorder='big', signed=True)
raw_int = int(hexstr, 16)
return raw_int - SIGNED_BIT_2 if raw_int >= SIGNED_BIT else raw_int


def parse_sd_file(file):
Expand Down