mirror of
https://github.com/DJ2LS/FreeDATA
synced 2024-05-14 08:04:33 +00:00
7c4ccac6a0
can even do longer or shorter en/decoding using bytes_length parameter for other purpose could be extendet for lower case letters, not implemented to save performance
360 lines
10 KiB
Python
360 lines
10 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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Created on Fri Dec 25 21:25:14 2020
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@author: DJ2LS
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"""
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import time
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import crcengine
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import static
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def wait(seconds):
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"""
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Args:
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seconds:
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Returns:
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"""
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timeout = time.time() + seconds
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while time.time() < timeout:
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time.sleep(0.01)
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return True
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def get_crc_8(data):
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"""Author: DJ2LS
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Get the CRC8 of a byte string
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param: data = bytes()
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Args:
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data:
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Returns:
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"""
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crc_algorithm = crcengine.new('crc8-ccitt') # load crc8 library
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crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(1, byteorder='big')
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return crc_data
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def get_crc_16(data):
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"""Author: DJ2LS
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Get the CRC16 of a byte string
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param: data = bytes()
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Args:
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data:
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Returns:
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"""
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crc_algorithm = crcengine.new('crc16-ccitt-false') # load crc16 library
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crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(2, byteorder='big')
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return crc_data
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def get_crc_32(data):
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"""Author: DJ2LS
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Get the CRC32 of a byte string
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param: data = bytes()
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Args:
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data:
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Returns:
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"""
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crc_algorithm = crcengine.new('crc32') # load crc16 library
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crc_data = crc_algorithm(data)
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crc_data = crc_data.to_bytes(4, byteorder='big')
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return crc_data
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def add_to_heard_stations(dxcallsign, dxgrid, datatype, snr, offset, frequency):
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"""
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Args:
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dxcallsign:
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dxgrid:
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datatype:
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snr:
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offset:
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frequency:
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Returns:
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"""
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# check if buffer empty
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if len(static.HEARD_STATIONS) == 0:
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static.HEARD_STATIONS.append([dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency])
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# if not, we search and update
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else:
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for i in range(0, len(static.HEARD_STATIONS)):
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# update callsign with new timestamp
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if static.HEARD_STATIONS[i].count(dxcallsign) > 0:
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static.HEARD_STATIONS[i] = [dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency]
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break
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# insert if nothing found
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if i == len(static.HEARD_STATIONS) - 1:
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static.HEARD_STATIONS.append([dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency])
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break
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# for idx, item in enumerate(static.HEARD_STATIONS):
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# if dxcallsign in item:
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# item = [dxcallsign, int(time.time())]
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# static.HEARD_STATIONS[idx] = item
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def callsign_to_bytes(callsign):
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"""
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Args:
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callsign:
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Returns:
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"""
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# http://www.aprs.org/aprs11/SSIDs.txt
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#-0 Your primary station usually fixed and message capable
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#-1 generic additional station, digi, mobile, wx, etc
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#-2 generic additional station, digi, mobile, wx, etc
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#-3 generic additional station, digi, mobile, wx, etc
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#-4 generic additional station, digi, mobile, wx, etc
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#-5 Other networks (Dstar, Iphones, Androids, Blackberry's etc)
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#-6 Special activity, Satellite ops, camping or 6 meters, etc
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#-7 walkie talkies, HT's or other human portable
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#-8 boats, sailboats, RV's or second main mobile
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#-9 Primary Mobile (usually message capable)
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#-10 internet, Igates, echolink, winlink, AVRS, APRN, etc
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#-11 balloons, aircraft, spacecraft, etc
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#-12 APRStt, DTMF, RFID, devices, one-way trackers*, etc
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#-13 Weather stations
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#-14 Truckers or generally full time drivers
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#-15 generic additional station, digi, mobile, wx, etc
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# try converting to bytestring if possible type string
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try:
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callsign = bytes(callsign, 'utf-8')
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except:
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pass
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# we need to do this step to reduce the needed paypload by the callsign ( stripping "-" out of the callsign )
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callsign = callsign.split(b'-')
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try:
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ssid = int(callsign[1])
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except:
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ssid = 0
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callsign = callsign[0]
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bytestring = bytearray(8)
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bytestring[:len(callsign)] = callsign
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bytestring[7:8] = bytes([ssid])
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return bytes(bytestring)
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def bytes_to_callsign(bytestring):
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"""
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Args:
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bytestring:
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Returns:
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"""
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# http://www.aprs.org/aprs11/SSIDs.txt
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#-0 Your primary station usually fixed and message capable
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#-1 generic additional station, digi, mobile, wx, etc
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#-2 generic additional station, digi, mobile, wx, etc
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#-3 generic additional station, digi, mobile, wx, etc
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#-4 generic additional station, digi, mobile, wx, etc
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#-5 Other networks (Dstar, Iphones, Androids, Blackberry's etc)
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#-6 Special activity, Satellite ops, camping or 6 meters, etc
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#-7 walkie talkies, HT's or other human portable
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#-8 boats, sailboats, RV's or second main mobile
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#-9 Primary Mobile (usually message capable)
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#-10 internet, Igates, echolink, winlink, AVRS, APRN, etc
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#-11 balloons, aircraft, spacecraft, etc
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#-12 APRStt, DTMF, RFID, devices, one-way trackers*, etc
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#-13 Weather stations
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#-14 Truckers or generally full time drivers
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#-15 generic additional station, digi, mobile, wx, etc
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# we need to do this step to reduce the needed paypload by the callsign ( stripping "-" out of the callsign )
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callsign = bytes(bytestring[:7])
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callsign = callsign.rstrip(b'\x00')
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ssid = int.from_bytes(bytes(bytestring[7:8]), "big")
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callsign = callsign + b'-'
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callsign = callsign.decode('utf-8')
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callsign = callsign + str(ssid)
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callsign = callsign.encode('utf-8')
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return bytes(callsign)
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def check_callsign(callsign:bytes, crc_to_check:bytes):
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"""
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Funktion to check a crc against a callsign to calculate the ssid by generating crc until we got it
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Args:
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callsign: Callsign which we want to check
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crc_to_check: The CRC which we want the callsign to check against
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Returns:
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[True, Callsign + SSID]
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False
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"""
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crc_algorithm = crcengine.new('crc16-ccitt-false') # load crc16 library
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try:
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callsign = callsign.split(b'-')
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callsign = callsign[0] # we want the callsign without SSID
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except:
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callsign = callsign
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print(static.SSID_LIST)
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for ssid in static.SSID_LIST:
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print(ssid)
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for ssid in static.SSID_LIST:
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#for ssid in range(0,254):
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call_with_ssid = bytearray(callsign)
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call_with_ssid.extend('-'.encode('utf-8'))
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call_with_ssid.extend(str(ssid).encode('utf-8'))
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callsign_crc = get_crc_16(call_with_ssid)
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if callsign_crc == crc_to_check:
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print(call_with_ssid)
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return [True, bytes(call_with_ssid)]
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return [False, ""]
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def encode_grid(grid):
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"""
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@auther: DB1UJ
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Args:
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grid:string: maidenhead QTH locater [a-r][a-r][0-9][0-9][a-x][a-x]
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Returns:
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4 bytes contains 26 bit valid data with encoded grid locator
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"""
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out_code_word = int(0)
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grid = grid.upper() # upper case to be save
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int_first = ord(grid[0])-65 # -65 offset for 'A' become zero, utf8 table
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int_sec = ord(grid[1])-65 # -65 offset for 'A' become zero, utf8 table
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int_val = (int_first * 18) + int_sec # encode for modulo devision, 2 numbers in 1
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out_code_word = (int_val & 0b111111111) # only 9 bit LSB A - R * A - R is needed
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out_code_word = out_code_word << 9 # shift 9 bit left having space next bits, letter A-R * A-R
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int_val = int(grid[2:4]) # number string to number int, highest value 99
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out_code_word = out_code_word | (int_val & 0b1111111) # using bit OR to add new value
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out_code_word = out_code_word << 7 # shift 7 bit left having space next bits, letter A-X
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int_val = ord(grid[4])-65 # -65 offset for 'A' become zero, utf8 table
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out_code_word = out_code_word | (int_val & 0b11111) # using bit OR to add new value
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out_code_word = out_code_word << 5 # shift 5 bit left having space next bits, letter A-X
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int_val = ord(grid[5])-65 # -65 offset for 'A' become zero, utf8 table
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out_code_word = out_code_word | (int_val & 0b11111) # using bit OR to add new value
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return out_code_word.to_bytes(length=4, byteorder='big')
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def decode_grid(b_code_word:bytes):
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"""
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@auther: DB1UJ
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Args:
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b_code_word:bytes: 4 bytes with 26 bit valid data LSB
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Returns:
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grid:str: upper case maidenhead QTH locater [A-R][A-R][0-9][0-9][A-X][A-X]
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"""
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code_word = int.from_bytes(b_code_word, byteorder='big', signed=False)
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grid = chr((code_word & 0b11111) + 65)
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code_word = code_word >> 5
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grid = chr((code_word & 0b11111) + 65) + grid
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code_word = code_word >> 7
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grid = str(int(code_word & 0b1111111)) + grid
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if (code_word & 0b1111111) < 10:
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grid = '0' + grid
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code_word = code_word >> 9
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int_val = int(code_word & 0b111111111)
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int_first = int_val // 18
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int_sec = int_val % 18
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grid = chr(int(int_first)+65) + chr(int(int_sec)+65) + grid
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return grid
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def encode_call(call, bytes_length=6):
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"""
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@Auther: DB1UJ
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Args:
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call:string: ham radio call sign [A-Z,0-9]
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bytes_length:int: number of output bytes, have to fit 6 bits/sign, standard 6 bytes
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Returns:
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bytes_length bytes (standard 6) contains 6 bits/sign encoded 8 char call sign (only upper letters + numbers)
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"""
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out_code_word = int(0)
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call = call.upper() # upper case to be save
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for x in call:
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int_val = ord(x)-48 # -48 reduce bits, begin with first number utf8 table
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out_code_word = out_code_word << 6 # shift left 6 bit, making space for a new char
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out_code_word = out_code_word | (int_val & 0b111111) # bit OR adds the new char, masked with AND 0b111111
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return out_code_word.to_bytes(length=bytes_length, byteorder='big')
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def decode_call(b_code_word:bytes):
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"""
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@Auther: DB1UJ
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Args:
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b_code_word:bytes: 6 bytes with 6 bits/sign valid data char signs LSB
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Returns:
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call:str: upper case ham radio call sign [A-Z,0-9]
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"""
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code_word = int.from_bytes(b_code_word, byteorder='big', signed=False)
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call = str()
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while code_word != 0:
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call = chr((code_word & 0b111111)+48) + call
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code_word = code_word >> 6
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return call
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