ref2json.py

#!/usr/bin/env python3
import sys
import zlib
import json

signals = []

with open(sys.argv[1], "rb") as data:
    fver = data.readline().decode('utf-8').strip()
    sn = data.readline().decode('utf-8').strip()
    unitsn = zlib.decompress(data.read(int.from_bytes(data.read(2), "big"))).decode(
        "utf-8"
    )
    entries = int.from_bytes(data.read(2), "big")
    for _ in range(entries):
        chunk = zlib.decompress(data.read(int.from_bytes(data.read(2), "big"))).decode(
            "utf-8"
        )
        arr = chunk.split(",")
        canSignal = {
            "name": arr[0],
            "units": arr[2],
            "identifier": int(arr[1]) & 0x7FFFFFFF,
            "extended": True if ((int(arr[1]) & 0x80000000) == 0x80000000) else False,
            "startBit": int(arr[3]),
            "length": int(arr[4]),
            "offset": float(arr[5]),
            "scale": float(arr[6]),
            "maximum": float(arr[7]),
            "minimum": float(arr[8]),
            "dataFormat": arr[9].lower(),
            "byteOrder": arr[10].lower(),
        }
        if canSignal["byteOrder"] == "motorola":
            canSignal["startBit"] += 56 - int(arr[3]) / 8 * 16
        if fver.endswith('a'):
            canSignal['dataLengthCode'] = int(arr[11])
        signals.append(canSignal)
print(json.dumps(signals, indent=4))