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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2020 Daniel Estevez <daniel@destevez.net>
#
# This file is part of gr-satellites
#
# SPDX-License-Identifier: GPL-3.0-or-later
#
# Based on the decoder by Xerbo
# https://github.com/Xerbo/Lucky7-Decoder
import struct
from .imagereceiver import ImageReceiver
class ImageReceiverLucky7(ImageReceiver):
def chunk_sequence(self, chunk):
return struct.unpack('>H', chunk[3:5])[0]
def chunk_size(self):
return 28
def chunk_data(self, chunk):
return chunk[7:]
def file_size(self, chunk):
return self.chunk_size() * struct.unpack('>H', chunk[5:7])[0]
def parse_chunk(self, chunk):
address = struct.unpack('>H', chunk[1:3])[0]
if (address < 0xC000
or address >= (
0xC000 + self.file_size(chunk)/self.chunk_size())):
return None
return chunk
lucky7 = ImageReceiverLucky7
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