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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2017 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
import struct
from gnuradio import gr
import numpy
import pmt
from . import crc32c
class append_crc32c(gr.basic_block):
"""docstring for block append_crc32c"""
def __init__(self, include_header):
gr.basic_block.__init__(
self,
name='append_crc32c',
in_sig=[],
out_sig=[])
self.include_header = include_header
self.message_port_register_in(pmt.intern('in'))
self.set_msg_handler(pmt.intern('in'), self.handle_msg)
self.message_port_register_out(pmt.intern('out'))
def handle_msg(self, msg_pmt):
msg = pmt.cdr(msg_pmt)
if not pmt.is_u8vector(msg):
print('[ERROR] Received invalid message type. Expected u8vector')
return
packet = bytes(pmt.u8vector_elements(msg))
crc = crc32c.crc(packet if self.include_header else packet[4:])
packet += struct.pack('>I', crc)
self.message_port_pub(
pmt.intern('out'),
pmt.cons(pmt.PMT_NIL, pmt.init_u8vector(len(packet), packet)))
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