mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-15 02:34:33 -05:00
033c4e9a5b
* Updated style * Updated files * fixed new line * Updated spacing * File fix WIP * Updated to clang 13 * updated comment style * Removed old comment code
96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
*
|
|
* This file is part of PortaPack.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "manchester.hpp"
|
|
|
|
#include "string_format.hpp"
|
|
|
|
size_t ManchesterBase::symbols_count() const {
|
|
return packet.size() / 2;
|
|
}
|
|
|
|
DecodedSymbol ManchesterDecoder::operator[](const size_t index) const {
|
|
const size_t encoded_index = index * 2;
|
|
if ((encoded_index + 1) < packet.size()) {
|
|
const auto value = packet[encoded_index + sense];
|
|
const auto error = packet[encoded_index + 0] == packet[encoded_index + 1];
|
|
return {value, error};
|
|
} else {
|
|
return {0, 1};
|
|
}
|
|
}
|
|
|
|
DecodedSymbol BiphaseMDecoder::operator[](const size_t index) const {
|
|
const size_t encoded_index = index * 2;
|
|
if ((encoded_index + 1) < packet.size()) {
|
|
const auto value = packet[encoded_index + 0] != packet[encoded_index + 1];
|
|
const uint_fast8_t error = encoded_index ? (packet[encoded_index - 1] == packet[encoded_index + 0]) : 0;
|
|
return {value, error};
|
|
} else {
|
|
return {0, 1};
|
|
}
|
|
}
|
|
|
|
FormattedSymbols format_symbols(
|
|
const ManchesterBase& decoder) {
|
|
const size_t payload_length_decoded = decoder.symbols_count();
|
|
const size_t payload_length_hex_characters = (payload_length_decoded + 3) / 4;
|
|
const size_t payload_length_symbols_rounded = payload_length_hex_characters * 4;
|
|
|
|
std::string hex_data;
|
|
std::string hex_error;
|
|
hex_data.reserve(payload_length_hex_characters);
|
|
hex_error.reserve(payload_length_hex_characters);
|
|
|
|
uint_fast8_t data = 0;
|
|
uint_fast8_t error = 0;
|
|
for (size_t i = 0; i < payload_length_symbols_rounded; i++) {
|
|
const auto symbol = decoder[i];
|
|
|
|
data <<= 1;
|
|
data |= symbol.value;
|
|
|
|
error <<= 1;
|
|
error |= symbol.error;
|
|
|
|
if ((i & 3) == 3) {
|
|
hex_data += to_string_hex(data & 0xf, 1);
|
|
hex_error += to_string_hex(error & 0xf, 1);
|
|
}
|
|
}
|
|
|
|
return {hex_data, hex_error};
|
|
}
|
|
|
|
void manchester_encode(uint8_t* dest, uint8_t* src, const size_t length, const size_t sense) {
|
|
uint8_t part = sense ? 0 : 0xFF;
|
|
|
|
for (size_t c = 0; c < length; c++) {
|
|
if ((src[c >> 3] << (c & 7)) & 0x80) {
|
|
*(dest++) = part;
|
|
*(dest++) = ~part;
|
|
} else {
|
|
*(dest++) = ~part;
|
|
*(dest++) = part;
|
|
}
|
|
}
|
|
}
|