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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2021 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
import struct
from construct import ConstructError
from .filereceiver import FileReceiver
from ..telemetry import ax25
class FileReceiverMirSat1(FileReceiver):
def file_id(self, chunk):
return struct.unpack('<I', chunk[1:5])[0]
def chunk_offset(self, chunk):
return struct.unpack('<I', chunk[6:9] + b'\x00')[0]
def chunk_data(self, chunk):
return chunk[9:-2]
def is_last_chunk(self, chunk):
return chunk[0] & 0x20
def parse_chunk(self, chunk):
try:
frame = ax25.parse(chunk)
except ConstructError:
return None
if frame.header.pid == 0xBB:
# TODO check CRC-16
return frame.info
return None
mirsat1 = FileReceiverMirSat1
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