mirror of
https://github.com/f4exb/sdrangel.git
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373 lines
12 KiB
C++
373 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2023 Jon Beniston, M7RCE <jon@beniston.com> //
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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 as version 3 of the License, or //
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// (at your option) 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 V3 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. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <QDebug>
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#include "baudot.h"
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// https://en.wikipedia.org/wiki/Baudot_code
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// We use < for FIGS and > for LTRS and ^ for Cyrillic
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// Unicode used for source file encoding
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const QStringList Baudot::m_ita2Letter = {
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"\0", "E", "\n", "A", " ", "S", "I", "U",
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"\r", "D", "R", "J", "N", "F", "C", "K",
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"T", "Z", "L", "W", "H", "Y", "P", "Q",
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"O", "B", "G", "<", "M", "X", "V", ">"
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};
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const QStringList Baudot::m_ita2Figure = {
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"\0", "3", "\n", "-", " ", "\'", "8", "7",
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"\r", "\x5", "4", "\a", ",", "!", ":", "(",
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"5", "+", ")", "2", "£", "6", "0", "1",
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"9", "?", "&", "<", ".", "/", "=", ">"
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};
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const QStringList Baudot::m_ukLetter = {
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"\0", "A", "E", "/", "Y", "U", "I", "O",
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"<", "J", "G", "H", "B", "C", "F", "D",
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" ", "-", "X", "Z", "S", "T", "W", "V",
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"\b", "K", "M", "L", "R", "Q", "N", "P"
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};
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const QStringList Baudot::m_ukFigure = {
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"\0", "1", "2", "⅟", "3", "4", "³⁄", "5",
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" ", "6", "7", "¹", "8", "9", "⁵⁄", "0",
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">", ".", "⁹⁄", ":", "⁷⁄", "²", "?", "\'",
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"\b", "(", ")", "=", "-", "/", "£", "+"
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};
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const QStringList Baudot::m_europeanLetter = {
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"\0", "A", "E", "É", "Y", "U", "I", "O",
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"<", "J", "G", "H", "B", "C", "F", "D",
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" ", "t", "X", "Z", "S", "T", "W", "V",
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"\b", "K", "M", "L", "R", "Q", "N", "P"
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};
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const QStringList Baudot::m_europeanFigure = {
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"\0", "1", "2", "&", "3", "4", "º", "5",
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" ", "6", "7", "H̱", "8", "9", "F̱", "0",
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">", ".", ",", ":", ";", "!", "?", "\'",
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"\b", "(", ")", "=", "-", "/", "№", "%"
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};
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const QStringList Baudot::m_usLetter = {
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"\0", "E", "\n", "A", " ", "S", "I", "U",
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"\r", "D", "R", "J", "N", "F", "C", "K",
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"T", "Z", "L", "W", "H", "Y", "P", "Q",
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"O", "B", "G", "<", "M", "X", "V", ">"
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};
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const QStringList Baudot::m_usFigure = {
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"\0", "3", "\n", "-", " ", "\a", "8", "7",
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"\r", "\x5", "4", "\'", ",", "!", ":", "(",
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"5", "\"", ")", "2", "#", "6", "0", "1",
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"9", "?", "&", "<", ".", "/", ";", ">"
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};
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const QStringList Baudot::m_russianLetter = {
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"\0", "Е", "\n", "А", " ", "С", "И", "У",
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"\r", "Д", "Р", "Й", "Ч", "Ф", "Ц", "К",
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"Т", "З", "Л", "В", "Х", "Ы", "П", "Я",
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"О", "Б", "Г", "<", "М", "Ь", "Ж", ">"
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};
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const QStringList Baudot::m_russianFigure = {
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"\0", "3", "\n", "-", " ", "\'", "8", "7",
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"\r", "Ч", "4", "Ю", ",", "Э", ":", "(",
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"5", "+", ")", "2", "Щ", "6", "0", "1",
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"9", "?", "Ш", "<", ".", "/", ";", ">"
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};
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const QStringList Baudot::m_murrayLetter = {
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" ", "E", "?", "A", ">", "S", "I", "U",
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"\n", "D", "R", "J", "N", "F", "C", "K",
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"T", "Z", "L", "W", "H", "Y", "P", "Q",
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"O", "B", "G", "<", "M", "X", "V", "\b"
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};
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const QStringList Baudot::m_murrayFigure = {
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" ", "3", "?", " ", ">", "'", "8", "7",
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"\n", "²", "4", "⁷⁄", "-", "⅟", "(", "⁹⁄",
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"5", ".", "/", "2", "⁵⁄", "6", "0", "1",
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"9", "?", "³⁄", "<", ",", "£", ")", "\b"
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};
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BaudotDecoder::BaudotDecoder()
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{
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setCharacterSet(Baudot::ITA2);
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setUnshiftOnSpace(false);
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init();
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}
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void BaudotDecoder::setCharacterSet(Baudot::CharacterSet characterSet)
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{
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m_characterSet = characterSet;
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switch (m_characterSet)
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{
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case Baudot::ITA2:
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m_letters = Baudot::m_ita2Letter;
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m_figures = Baudot::m_ita2Figure;
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break;
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case Baudot::UK:
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m_letters = Baudot::m_ukLetter;
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m_figures = Baudot::m_ukFigure;
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break;
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case Baudot::EUROPEAN:
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m_letters = Baudot::m_europeanLetter;
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m_figures = Baudot::m_europeanFigure;
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break;
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case Baudot::US:
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m_letters = Baudot::m_usLetter;
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m_figures = Baudot::m_usFigure;
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break;
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case Baudot::RUSSIAN:
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m_letters = Baudot::m_russianLetter;
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m_figures = Baudot::m_russianFigure;
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break;
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case Baudot::MURRAY:
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m_letters = Baudot::m_murrayLetter;
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m_figures = Baudot::m_murrayFigure;
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break;
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default:
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qDebug() << "BaudotDecoder::BaudotDecoder: Unsupported character set " << m_characterSet;
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m_letters = Baudot::m_ita2Letter;
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m_figures = Baudot::m_ita2Figure;
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m_characterSet = Baudot::ITA2;
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break;
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}
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}
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void BaudotDecoder::setUnshiftOnSpace(bool unshiftOnSpace)
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{
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m_unshiftOnSpace = unshiftOnSpace;
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}
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void BaudotDecoder::init()
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{
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m_figure = false;
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}
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QString BaudotDecoder::decode(char bits)
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{
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QString c = m_figure ? m_figures[(int)bits] : m_letters[(int)bits];
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if ((c == ">") || (m_unshiftOnSpace && (c == " ")))
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{
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// Switch to letters
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m_figure = false;
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if (m_characterSet == Baudot::RUSSIAN) {
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m_letters = Baudot::m_ita2Letter;
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}
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}
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if (c == "<")
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{
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// Switch to figures
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m_figure = true;
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}
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if ((m_characterSet == Baudot::RUSSIAN) && (c == "\0"))
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{
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// Switch to Cyrillic
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m_figure = false;
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m_letters = Baudot::m_russianLetter;
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c = "^";
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}
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return c;
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}
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BaudotEncoder::BaudotEncoder()
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{
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setCharacterSet(Baudot::ITA2);
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setUnshiftOnSpace(false);
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setMsbFirst(false);
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setStartBits(1);
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setStopBits(1);
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init();
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}
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void BaudotEncoder::setCharacterSet(Baudot::CharacterSet characterSet)
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{
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m_characterSet = characterSet;
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switch (m_characterSet)
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{
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case Baudot::ITA2:
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m_chars[LETTERS] = Baudot::m_ita2Letter;
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m_chars[FIGURES] = Baudot::m_ita2Figure;
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break;
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case Baudot::UK:
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m_chars[LETTERS] = Baudot::m_ukLetter;
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m_chars[FIGURES] = Baudot::m_ukFigure;
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break;
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case Baudot::EUROPEAN:
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m_chars[LETTERS] = Baudot::m_europeanLetter;
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m_chars[FIGURES] = Baudot::m_europeanFigure;
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break;
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case Baudot::US:
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m_chars[LETTERS] = Baudot::m_usLetter;
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m_chars[FIGURES] = Baudot::m_usFigure;
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break;
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case Baudot::RUSSIAN:
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m_chars[LETTERS] = Baudot::m_ita2Letter;
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m_chars[FIGURES] = Baudot::m_russianFigure;
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break;
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case Baudot::MURRAY:
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m_chars[LETTERS] = Baudot::m_murrayLetter;
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m_chars[FIGURES] = Baudot::m_murrayFigure;
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break;
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default:
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qDebug() << "BaudotEncoder::BaudotEncoder: Unsupported character set " << m_characterSet;
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m_chars[LETTERS] = Baudot::m_ita2Letter;
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m_chars[FIGURES] = Baudot::m_ita2Figure;
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m_characterSet = Baudot::ITA2;
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break;
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}
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m_chars[(int)CYRILLIC] = Baudot::m_russianLetter;
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}
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void BaudotEncoder::setUnshiftOnSpace(bool unshiftOnSpace)
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{
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m_unshiftOnSpace = unshiftOnSpace;
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}
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void BaudotEncoder::setMsbFirst(bool msbFirst)
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{
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m_msbFirst = msbFirst;
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}
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// startBits should be 0 or 1
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void BaudotEncoder::setStartBits(int startBits)
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{
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m_startBits = startBits;
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}
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// stopBits should be 0, 1 or 2
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void BaudotEncoder::setStopBits(int stopBits)
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{
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m_stopBits = stopBits;
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}
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void BaudotEncoder::init()
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{
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m_page = LETTERS;
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}
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bool BaudotEncoder::encode(QChar c, unsigned &bits, unsigned int &bitCount)
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{
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bits = 0;
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bitCount = 0;
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// Only upper case is supported
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c = c.toUpper();
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QString s(c);
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if (s == '>')
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{
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addCode(bits, bitCount, m_chars[m_page].indexOf(s));
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m_page = LETTERS;
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return true;
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}
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else if (s == '<')
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{
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addCode(bits, bitCount, m_chars[m_page].indexOf(s));
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m_page = FIGURES;
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return true;
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}
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else if ((m_characterSet == Baudot::RUSSIAN) && (s == '\0'))
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{
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addCode(bits, bitCount, m_chars[m_page].indexOf(s));
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m_page = CYRILLIC;
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return true;
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}
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// We could create reverse look-up tables to speed this up, but it's only 200 baud...
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// Is character in current page? If so, use that, as it avoids switching
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if (m_chars[m_page].contains(s))
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{
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addCode(bits, bitCount, m_chars[m_page].indexOf(s));
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return true;
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}
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else
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{
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// Look for character in other pages
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const QString switchPage[] = { ">", "<", "\0" };
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for (int page = m_page == LETTERS ? 1 : 0; page < ((m_characterSet == Baudot::RUSSIAN) ? 3 : 2); page++)
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{
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if (m_chars[page].contains(s))
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{
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// Switch to page
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addCode(bits, bitCount, m_chars[m_page].indexOf(switchPage[page]));
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m_page = (BaudotEncoder::Page)page;
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addCode(bits, bitCount, m_chars[m_page].indexOf(s));
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return true;
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}
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}
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}
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return false;
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}
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void BaudotEncoder::addCode(unsigned& bits, unsigned int& bitCount, unsigned int code) const
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{
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const unsigned int codeLen = 5;
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addStartBits(bits, bitCount);
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code = reverseBits(code, codeLen);
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addBits(bits, bitCount, code, codeLen);
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addStopBits(bits, bitCount);
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}
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void BaudotEncoder::addStartBits(unsigned& bits, unsigned int& bitCount) const
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{
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// Start bit is 0
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addBits(bits, bitCount, 0, m_startBits);
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}
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void BaudotEncoder::addStopBits(unsigned& bits, unsigned int& bitCount) const
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{
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// Stop bit is 1
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addBits(bits, bitCount, ((1 << m_stopBits)) - 1, m_stopBits);
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}
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void BaudotEncoder::addBits(unsigned& bits, unsigned int& bitCount, int data, int count) const
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{
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bits |= data << bitCount;
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bitCount += count;
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}
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unsigned BaudotEncoder::reverseBits(unsigned bits, unsigned int count) const
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{
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if (m_msbFirst) {
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return BaudotEncoder::reverse(bits) >> (sizeof(unsigned int) * 8 - count);
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} else {
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return bits;
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}
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}
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unsigned int BaudotEncoder::reverse(unsigned int x)
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{
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x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
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x = (((x & 0xcccccccc) >> 2) | ((x & 0x33333333) << 2));
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x = (((x & 0xf0f0f0f0) >> 4) | ((x & 0x0f0f0f0f) << 4));
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x = (((x & 0xff00ff00) >> 8) | ((x & 0x00ff00ff) << 8));
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return((x >> 16) | (x << 16));
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}
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