def decode_name_component(self, decoder: TlvDecoder) -> bytearray:
"""
Decode a name component
:param decoder: Decoder
:return: Value of name component
"""
savePosition = decoder.getOffset()
type = decoder.readVarNumber()
decoder.seek(savePosition)
return decoder.readBlobTlv(type).tobytes()
def decode_data(self, input: bytearray) -> ([bytearray], bytearray):
"""
Decodes a data packet
:param input: Data packet in NDN-TLV wire format
:return: Name and payload
"""
decoder = TlvDecoder(input)
decoder.readNestedTlvsStart(Tlv.Data)
name = self.decode_name(decoder)
self.decode_meta_info(decoder)
payload = decoder.readBlobTlv(Tlv.Content).tobytes()
return (name, payload)
def decode_name(self, decoder: TlvDecoder) -> Name:
"""
Decode a name
:param decoder: Decoder
:return: Name
"""
endOffset = decoder.readNestedTlvsStart(Tlv.Name)
comps = []
dgest = None
while decoder.getOffset() < endOffset:
if decoder.peekType(Tlv.ImplicitSha256DigestComponent, endOffset):
dgest = decoder.readBlobTlv(Tlv.ImplicitSha256DigestComponent)
dgest = dgest.tobytes()
else:
comps.append(self.decode_name_component(decoder))
decoder.finishNestedTlvs(endOffset)
return Name(suite='ndn2013').__add__(comps).set_digest(dgest)