32 lines
No EOL
1 KiB
Python
32 lines
No EOL
1 KiB
Python
# generates the 8-bit checksum from a JSON file, provided its path is given as an argument
|
|
import sys
|
|
import json
|
|
|
|
# load json file from provided path
|
|
try:
|
|
with open(sys.argv[1], 'r') as f:
|
|
json_data = json.load(f)
|
|
except FileNotFoundError as e:
|
|
print("Error: JSON file not found, exiting...")
|
|
exit(1)
|
|
|
|
if not json_data:
|
|
print("Error: JSON file did not contain any data or path didn't match exactly, exiting...")
|
|
exit(1)
|
|
|
|
if 'checksum' in json_data:
|
|
del json_data['checksum']
|
|
|
|
# NOTE: This is important to re-serialize json data to match ArduinoJSON's compact serialization format
|
|
str_json_data = json.dumps(json_data, separators=(',', ':'), sort_keys=True)
|
|
|
|
# calculate checksum
|
|
calculated_checksum = sum(bytearray(str_json_data.encode())) & 0xFF
|
|
print('Checksum: ', calculated_checksum)
|
|
print('Checksum (hex): ', hex(calculated_checksum))
|
|
|
|
# store and write checksum to new file
|
|
json_data['checksum'] = calculated_checksum
|
|
with open(sys.argv[1], 'w') as f:
|
|
json.dump(json_data, f)
|
|
print('SUCCESS: Checksum written to JSON file!') |