SAE-J2735-Python/J2735Decoders.py at master · DeepJames/SAE-J2735-Python · GitHub

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from pyasn1.type import univ
from pyasn1.codec.der import encoder as DERencoder, decoder as DERdecoder


from j2735 import *
from Plausability import nmea2deg

from J2735Encoders import *

import datetime


BSMcounter = 0

def decodeJ2735BSM(encodedJ2735):
	decoded = DERdecoder.decode(encodedJ2735, asn1Spec=BasicSafetyMessage())
	return decoded[0]

def decodeJ2735ALC(encodedALC):
	decoded = DERdecoder.decode(encodedALC, asn1Spec=ALaCarte())
	return decoded[0]

##
## GETTERS AND SETTERS
##
def getMessageType(encodedJ2735):
	try:

		decoded = DERdecoder.decode(encodedJ2735)

		if(str(decoded[0].getComponentByPosition(0))=="2"):
			return "BSM"

		elif(str(decoded[0].getComponentByPosition(0))=="1"):
			return "ALC"

	except Exception, err:
	#	print "GETMESSAGETYPE: REBENTEI COM EXCEPCAO: " + str(err)
		return "STDMSG"

# ALC Getters
def ALCget_appID(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(1))

def ALCget_initTS(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(2))

def ALCget_recvTS(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(3))

def ALCget_source(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(4))

def ALCget_destination(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(5))

def ALCget_destport(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(6))

def ALCget_appData(encodedALC):
	decodedALC = decodeJ2735ALC(encodedALC)
	return str(decodedALC.getComponentByPosition(7))

# ALC SETTERS
def ALCset_source(encodedALC, sourceIP):
	decodedALC = decodeJ2735ALC(encodedALC)
	encodedALC = createALaCarte(decodedALC.getComponentByPosition(1),decodedALC.getComponentByPosition(2), decodedALC.getComponentByPosition(3), sourceIP, decodedALC.getComponentByPosition(5), decodedALC.getComponentByPosition(6), decodedALC.getComponentByPosition(7))
	return encodedALC

def ALCset_recvTS(encodedALC, recvTS):
	decodedALC = decodeJ2735ALC(encodedALC)
	encodedALC = createALaCarte(decodedALC.getComponentByPosition(1),decodedALC.getComponentByPosition(2), recvTS, decodedALC.getComponentByPosition(4), decodedALC.getComponentByPosition(5), decodedALC.getComponentByPosition(6), decodedALC.getComponentByPosition(7))
	return encodedALC