Properly handle parity bits in codeToHex
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26
doorUtil.py
26
doorUtil.py
@ -1,21 +1,35 @@
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#!/usr/bin/env python3
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import bitstring
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import requests
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import csv
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from io import StringIO
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from common import *
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def hexToCode(hex):
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b = bin(int(hex, 16))[2:]
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facility = int(b[0:8], 2)
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code = int(b[9:24], 2)
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return((facility, code))
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# Reference for H10301 card format:
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# https://www.hidglobal.com/sites/default/files/hid-understanding_card_data_formats-wp-en.pdf
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def hexToCode(h):
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b = bitstring.Bits(hex=h)
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facility = b[7:15].uint
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code = b[15:31].uint
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return ((facility, code))
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def codeToHex(facility, code):
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return "{:08X}".format(int(bin(facility)[2:] + "0" + bin(code)[2:] + "1", 2))
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b = bitstring.pack('0b000000, uint:1, uint:8, uint:16, uint:1', 0,
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facility, code, 0)
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# calculate parity bits
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b[6] = b[7:19].count(1) % 2 # even parity
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b[31] = not (b[19:31].count(1) % 2) # odd parity
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return b.hex.upper()
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# hexToCode("01E29DA1") <-> codeToHex(241, 20176)
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def forEachDoor(fxn):
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for door in doors.values():
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print(door.name)
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