def doParse(self, data: bytes) -> GCCPDU:
"""
Parses the raw data bytes into a GCCPDU
:param data: PDU data.
"""
stream = BytesIO(data)
tag = per.readChoice(stream)
if tag != 0:
raise ParsingError("Expected object tag (0), got %d instead" % tag)
oid = per.readObjectIdentifier(stream)
if oid != GCCParser.T124_02_98_OID:
raise ParsingError("Invalid object identifier: %r, expected %r" %
(oid, GCCParser.T124_02_98_OID))
_length = per.readLength(stream)
header = per.readChoice(stream)
if header not in self.parsers:
raise UnknownPDUTypeError(
"Trying to parse unknown GCC PDU type %s" % header, header)
pdu = self.parsers[header](stream)
return pdu
def parseConferenceCreateRequest(
self, stream: BytesIO) -> GCCConferenceCreateRequestPDU:
"""
Parse ConferenceCreateRequest data into a GCCPDU
:param stream: byte stream containing the PDU data
"""
prop = per.readSelection(stream)
if prop != 8:
raise ParsingError(
"Expected property to be 8 (conference name), got %d" % prop)
conferenceName = per.readNumericString(stream, 1)
stream.read(1)
userDataCount = per.readNumberOfSet(stream)
if userDataCount != 1:
raise ParsingError("Expected user data count to be 1, got %d" %
userDataCount)
userDataType = per.readChoice(stream)
if userDataType != 0xc0:
raise ParsingError(
"Expected user data type to be 0xc0 (h221NonStandard), got %d"
% userDataType)
key = per.readOctetStream(stream, 4)
if key != GCCParser.H221_CLIENT_KEY:
raise ParsingError("Expected user data key to be %s, got %s" %
(GCCParser.H221_CLIENT_KEY, key))
payload = per.readOctetStream(stream)
return GCCConferenceCreateRequestPDU(conferenceName, payload)
def parseConferenceCreateResponse(
self, stream: BytesIO) -> GCCConferenceCreateResponsePDU:
"""
Parse ConferenceCreateResponse data into a GCCPDU
:param stream: byte stream containing the PDU data
"""
nodeID = Uint16BE.unpack(stream.read(2)) + 1001
tag = per.readInteger(stream)
result = per.readEnumeration(stream)
userDataCount = per.readNumberOfSet(stream)
if userDataCount != 1:
raise ParsingError("Expected user data count to be 1, got %d" %
userDataCount)
userDataType = per.readChoice(stream)
if userDataType != 0xc0:
raise ParsingError(
"Expected user data type to be 0xc0 (h221NonStandard), got %d"
% userDataType)
key = per.readOctetStream(stream, 4)
if key != GCCParser.H221_SERVER_KEY:
raise ParsingError("Expected user data key to be %s, got %s" %
(GCCParser.H221_SERVER_KEY, key))
payload = per.readOctetStream(stream)
return GCCConferenceCreateResponsePDU(nodeID, tag, result, payload)