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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2018 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
from gnuradio import gr
import numpy as np
import pmt
from .eseo_line_decoder import reflect_bytes
class eseo_packet_crop(gr.basic_block):
"""docstring for block eseo_packet_crop"""
def __init__(self, drop_rs):
gr.basic_block.__init__(
self,
name='eseo_packet_handler',
in_sig=[],
out_sig=[])
self.drop_rs = drop_rs
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))
# Find packet end marker
idx = packet.find(b'\x7e\x7e')
if idx == -1:
return
crop = idx if not self.drop_rs else idx - 16
if crop < 0:
return
# Reverse byte ordering
packet = np.frombuffer(packet[:crop], dtype='uint8')
packet = np.packbits(reflect_bytes(np.unpackbits(packet)))
packet = bytes(packet)
self.message_port_pub(pmt.intern('out'),
pmt.cons(pmt.car(msg_pmt),
pmt.init_u8vector(len(packet), packet)))
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