107 lines
2.5 KiB
C++
107 lines
2.5 KiB
C++
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/*
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* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "ert_packet.hpp"
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#include "crc.hpp"
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namespace ert {
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size_t Packet::length() const {
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return decoder_.symbols_count();
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}
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bool Packet::is_valid() const {
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return true;
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}
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Timestamp Packet::received_at() const {
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return packet_.timestamp();
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}
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Packet::Type Packet::type() const {
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return type_;
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}
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ID Packet::id() const {
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if( type() == Type::SCM ) {
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const auto msb = reader_.read(0, 2);
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const auto lsb = reader_.read(35, 24);
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return (msb << 24) | lsb;
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}
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if( type() == Type::IDM ) {
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return reader_.read(5 * 8, 32);
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}
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return invalid_id;
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}
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Consumption Packet::consumption() const {
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if( type() == Type::SCM ) {
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return reader_.read(11, 24);
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}
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if( type() == Type::IDM ) {
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return reader_.read(25 * 8, 32);
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}
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return invalid_consumption;
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}
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CommodityType Packet::commodity_type() const {
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if( type() == Type::SCM ) {
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return reader_.read(5, 4);
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}
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if( type() == Type::IDM ) {
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return reader_.read(4 * 8 + 4, 4);
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}
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return invalid_commodity_type;
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}
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FormattedSymbols Packet::symbols_formatted() const {
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return format_symbols(decoder_);
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}
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bool Packet::crc_ok() const {
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switch(type()) {
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case Type::SCM: return crc_ok_scm();
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case Type::IDM: return crc_ok_idm();
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default: return false;
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}
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}
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bool Packet::crc_ok_scm() const {
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CRC<16> ert_bch { 0x6f63 };
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size_t start_bit = 5;
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ert_bch.process_byte(reader_.read(0, start_bit));
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for(size_t i=start_bit; i<length(); i+=8) {
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ert_bch.process_byte(reader_.read(i, 8));
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}
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return ert_bch.checksum() == 0x0000;
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}
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bool Packet::crc_ok_idm() const {
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CRC<16> ert_crc_ccitt { 0x1021, 0xffff, 0x1d0f };
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for(size_t i=0; i<length(); i+=8) {
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ert_crc_ccitt.process_byte(reader_.read(i, 8));
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}
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return ert_crc_ccitt.checksum() == 0x0000;
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}
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} /* namespace ert */
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