mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-11 10:56:12 -05:00
373 lines
12 KiB
C++
373 lines
12 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
||
// Copyright (C) 2023 Jon Beniston, M7RCE <jon@beniston.com> //
|
||
// //
|
||
// 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 as version 3 of the License, 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 V3 for more details. //
|
||
// //
|
||
// You should have received a copy of the GNU General Public License //
|
||
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
||
///////////////////////////////////////////////////////////////////////////////////
|
||
|
||
#include <QDebug>
|
||
|
||
#include "baudot.h"
|
||
|
||
// https://en.wikipedia.org/wiki/Baudot_code
|
||
// We use < for FIGS and > for LTRS and ^ for Cyrillic
|
||
// Unicode used for source file encoding
|
||
|
||
const QStringList Baudot::m_ita2Letter = {
|
||
"\0", "E", "\n", "A", " ", "S", "I", "U",
|
||
"\r", "D", "R", "J", "N", "F", "C", "K",
|
||
"T", "Z", "L", "W", "H", "Y", "P", "Q",
|
||
"O", "B", "G", "<", "M", "X", "V", ">"
|
||
};
|
||
|
||
const QStringList Baudot::m_ita2Figure = {
|
||
"\0", "3", "\n", "-", " ", "\'", "8", "7",
|
||
"\r", "\x5", "4", "\a", ",", "!", ":", "(",
|
||
"5", "+", ")", "2", "£", "6", "0", "1",
|
||
"9", "?", "&", "<", ".", "/", "=", ">"
|
||
};
|
||
|
||
const QStringList Baudot::m_ukLetter = {
|
||
"\0", "A", "E", "/", "Y", "U", "I", "O",
|
||
"<", "J", "G", "H", "B", "C", "F", "D",
|
||
" ", "-", "X", "Z", "S", "T", "W", "V",
|
||
"\b", "K", "M", "L", "R", "Q", "N", "P"
|
||
};
|
||
|
||
const QStringList Baudot::m_ukFigure = {
|
||
"\0", "1", "2", "⅟", "3", "4", "³⁄", "5",
|
||
" ", "6", "7", "¹", "8", "9", "⁵⁄", "0",
|
||
">", ".", "⁹⁄", ":", "⁷⁄", "²", "?", "\'",
|
||
"\b", "(", ")", "=", "-", "/", "£", "+"
|
||
};
|
||
|
||
const QStringList Baudot::m_europeanLetter = {
|
||
"\0", "A", "E", "É", "Y", "U", "I", "O",
|
||
"<", "J", "G", "H", "B", "C", "F", "D",
|
||
" ", "t", "X", "Z", "S", "T", "W", "V",
|
||
"\b", "K", "M", "L", "R", "Q", "N", "P"
|
||
};
|
||
|
||
const QStringList Baudot::m_europeanFigure = {
|
||
"\0", "1", "2", "&", "3", "4", "º", "5",
|
||
" ", "6", "7", "H̱", "8", "9", "F̱", "0",
|
||
">", ".", ",", ":", ";", "!", "?", "\'",
|
||
"\b", "(", ")", "=", "-", "/", "№", "%"
|
||
};
|
||
|
||
const QStringList Baudot::m_usLetter = {
|
||
"\0", "E", "\n", "A", " ", "S", "I", "U",
|
||
"\r", "D", "R", "J", "N", "F", "C", "K",
|
||
"T", "Z", "L", "W", "H", "Y", "P", "Q",
|
||
"O", "B", "G", "<", "M", "X", "V", ">"
|
||
};
|
||
|
||
const QStringList Baudot::m_usFigure = {
|
||
"\0", "3", "\n", "-", " ", "\a", "8", "7",
|
||
"\r", "\x5", "4", "\'", ",", "!", ":", "(",
|
||
"5", "\"", ")", "2", "#", "6", "0", "1",
|
||
"9", "?", "&", "<", ".", "/", ";", ">"
|
||
};
|
||
|
||
const QStringList Baudot::m_russianLetter = {
|
||
"\0", "Е", "\n", "А", " ", "С", "И", "У",
|
||
"\r", "Д", "Р", "Й", "Ч", "Ф", "Ц", "К",
|
||
"Т", "З", "Л", "В", "Х", "Ы", "П", "Я",
|
||
"О", "Б", "Г", "<", "М", "Ь", "Ж", ">"
|
||
};
|
||
|
||
const QStringList Baudot::m_russianFigure = {
|
||
"\0", "3", "\n", "-", " ", "\'", "8", "7",
|
||
"\r", "Ч", "4", "Ю", ",", "Э", ":", "(",
|
||
"5", "+", ")", "2", "Щ", "6", "0", "1",
|
||
"9", "?", "Ш", "<", ".", "/", ";", ">"
|
||
};
|
||
|
||
const QStringList Baudot::m_murrayLetter = {
|
||
" ", "E", "?", "A", ">", "S", "I", "U",
|
||
"\n", "D", "R", "J", "N", "F", "C", "K",
|
||
"T", "Z", "L", "W", "H", "Y", "P", "Q",
|
||
"O", "B", "G", "<", "M", "X", "V", "\b"
|
||
};
|
||
|
||
const QStringList Baudot::m_murrayFigure = {
|
||
" ", "3", "?", " ", ">", "'", "8", "7",
|
||
"\n", "²", "4", "⁷⁄", "-", "⅟", "(", "⁹⁄",
|
||
"5", ".", "/", "2", "⁵⁄", "6", "0", "1",
|
||
"9", "?", "³⁄", "<", ",", "£", ")", "\b"
|
||
};
|
||
|
||
BaudotDecoder::BaudotDecoder()
|
||
{
|
||
setCharacterSet(Baudot::ITA2);
|
||
setUnshiftOnSpace(false);
|
||
init();
|
||
}
|
||
|
||
void BaudotDecoder::setCharacterSet(Baudot::CharacterSet characterSet)
|
||
{
|
||
m_characterSet = characterSet;
|
||
switch (m_characterSet)
|
||
{
|
||
case Baudot::ITA2:
|
||
m_letters = Baudot::m_ita2Letter;
|
||
m_figures = Baudot::m_ita2Figure;
|
||
break;
|
||
case Baudot::UK:
|
||
m_letters = Baudot::m_ukLetter;
|
||
m_figures = Baudot::m_ukFigure;
|
||
break;
|
||
case Baudot::EUROPEAN:
|
||
m_letters = Baudot::m_europeanLetter;
|
||
m_figures = Baudot::m_europeanFigure;
|
||
break;
|
||
case Baudot::US:
|
||
m_letters = Baudot::m_usLetter;
|
||
m_figures = Baudot::m_usFigure;
|
||
break;
|
||
case Baudot::RUSSIAN:
|
||
m_letters = Baudot::m_russianLetter;
|
||
m_figures = Baudot::m_russianFigure;
|
||
break;
|
||
case Baudot::MURRAY:
|
||
m_letters = Baudot::m_murrayLetter;
|
||
m_figures = Baudot::m_murrayFigure;
|
||
break;
|
||
default:
|
||
qDebug() << "BaudotDecoder::BaudotDecoder: Unsupported character set " << m_characterSet;
|
||
m_letters = Baudot::m_ita2Letter;
|
||
m_figures = Baudot::m_ita2Figure;
|
||
m_characterSet = Baudot::ITA2;
|
||
break;
|
||
}
|
||
}
|
||
|
||
void BaudotDecoder::setUnshiftOnSpace(bool unshiftOnSpace)
|
||
{
|
||
m_unshiftOnSpace = unshiftOnSpace;
|
||
}
|
||
|
||
void BaudotDecoder::init()
|
||
{
|
||
m_figure = false;
|
||
}
|
||
|
||
QString BaudotDecoder::decode(char bits)
|
||
{
|
||
QString c = m_figure ? m_figures[(int)bits] : m_letters[(int)bits];
|
||
|
||
if ((c == ">") || (m_unshiftOnSpace && (c == " ")))
|
||
{
|
||
// Switch to letters
|
||
m_figure = false;
|
||
if (m_characterSet == Baudot::RUSSIAN) {
|
||
m_letters = Baudot::m_ita2Letter;
|
||
}
|
||
}
|
||
if (c == "<")
|
||
{
|
||
// Switch to figures
|
||
m_figure = true;
|
||
}
|
||
if ((m_characterSet == Baudot::RUSSIAN) && (c == "\0"))
|
||
{
|
||
// Switch to Cyrillic
|
||
m_figure = false;
|
||
m_letters = Baudot::m_russianLetter;
|
||
c = "^";
|
||
}
|
||
|
||
return c;
|
||
}
|
||
|
||
BaudotEncoder::BaudotEncoder()
|
||
{
|
||
setCharacterSet(Baudot::ITA2);
|
||
setUnshiftOnSpace(false);
|
||
setMsbFirst(false);
|
||
setStartBits(1);
|
||
setStopBits(1);
|
||
init();
|
||
}
|
||
|
||
void BaudotEncoder::setCharacterSet(Baudot::CharacterSet characterSet)
|
||
{
|
||
m_characterSet = characterSet;
|
||
switch (m_characterSet)
|
||
{
|
||
case Baudot::ITA2:
|
||
m_chars[LETTERS] = Baudot::m_ita2Letter;
|
||
m_chars[FIGURES] = Baudot::m_ita2Figure;
|
||
break;
|
||
case Baudot::UK:
|
||
m_chars[LETTERS] = Baudot::m_ukLetter;
|
||
m_chars[FIGURES] = Baudot::m_ukFigure;
|
||
break;
|
||
case Baudot::EUROPEAN:
|
||
m_chars[LETTERS] = Baudot::m_europeanLetter;
|
||
m_chars[FIGURES] = Baudot::m_europeanFigure;
|
||
break;
|
||
case Baudot::US:
|
||
m_chars[LETTERS] = Baudot::m_usLetter;
|
||
m_chars[FIGURES] = Baudot::m_usFigure;
|
||
break;
|
||
case Baudot::RUSSIAN:
|
||
m_chars[LETTERS] = Baudot::m_ita2Letter;
|
||
m_chars[FIGURES] = Baudot::m_russianFigure;
|
||
break;
|
||
case Baudot::MURRAY:
|
||
m_chars[LETTERS] = Baudot::m_murrayLetter;
|
||
m_chars[FIGURES] = Baudot::m_murrayFigure;
|
||
break;
|
||
default:
|
||
qDebug() << "BaudotEncoder::BaudotEncoder: Unsupported character set " << m_characterSet;
|
||
m_chars[LETTERS] = Baudot::m_ita2Letter;
|
||
m_chars[FIGURES] = Baudot::m_ita2Figure;
|
||
m_characterSet = Baudot::ITA2;
|
||
break;
|
||
}
|
||
m_chars[(int)CYRILLIC] = Baudot::m_russianLetter;
|
||
}
|
||
|
||
void BaudotEncoder::setUnshiftOnSpace(bool unshiftOnSpace)
|
||
{
|
||
m_unshiftOnSpace = unshiftOnSpace;
|
||
}
|
||
|
||
void BaudotEncoder::setMsbFirst(bool msbFirst)
|
||
{
|
||
m_msbFirst = msbFirst;
|
||
}
|
||
|
||
// startBits should be 0 or 1
|
||
void BaudotEncoder::setStartBits(int startBits)
|
||
{
|
||
m_startBits = startBits;
|
||
}
|
||
|
||
// stopBits should be 0, 1 or 2
|
||
void BaudotEncoder::setStopBits(int stopBits)
|
||
{
|
||
m_stopBits = stopBits;
|
||
}
|
||
|
||
void BaudotEncoder::init()
|
||
{
|
||
m_page = LETTERS;
|
||
}
|
||
|
||
bool BaudotEncoder::encode(QChar c, unsigned &bits, unsigned int &bitCount)
|
||
{
|
||
bits = 0;
|
||
bitCount = 0;
|
||
|
||
// Only upper case is supported
|
||
c = c.toUpper();
|
||
QString s(c);
|
||
|
||
if (s == '>')
|
||
{
|
||
addCode(bits, bitCount, m_chars[m_page].indexOf(s));
|
||
m_page = LETTERS;
|
||
return true;
|
||
}
|
||
else if (s == '<')
|
||
{
|
||
addCode(bits, bitCount, m_chars[m_page].indexOf(s));
|
||
m_page = FIGURES;
|
||
return true;
|
||
}
|
||
else if ((m_characterSet == Baudot::RUSSIAN) && (s == '\0'))
|
||
{
|
||
addCode(bits, bitCount, m_chars[m_page].indexOf(s));
|
||
m_page = CYRILLIC;
|
||
return true;
|
||
}
|
||
|
||
// We could create reverse look-up tables to speed this up, but it's only 200 baud...
|
||
|
||
// Is character in current page? If so, use that, as it avoids switching
|
||
if (m_chars[m_page].contains(s))
|
||
{
|
||
addCode(bits, bitCount, m_chars[m_page].indexOf(s));
|
||
return true;
|
||
}
|
||
else
|
||
{
|
||
// Look for character in other pages
|
||
const QString switchPage[] = { ">", "<", "\0" };
|
||
|
||
for (int page = m_page == LETTERS ? 1 : 0; page < ((m_characterSet == Baudot::RUSSIAN) ? 3 : 2); page++)
|
||
{
|
||
if (m_chars[page].contains(s))
|
||
{
|
||
// Switch to page
|
||
addCode(bits, bitCount, m_chars[m_page].indexOf(switchPage[page]));
|
||
m_page = (BaudotEncoder::Page)page;
|
||
|
||
addCode(bits, bitCount, m_chars[m_page].indexOf(s));
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
void BaudotEncoder::addCode(unsigned& bits, unsigned int& bitCount, unsigned int code) const
|
||
{
|
||
const unsigned int codeLen = 5;
|
||
|
||
addStartBits(bits, bitCount);
|
||
code = reverseBits(code, codeLen);
|
||
addBits(bits, bitCount, code, codeLen);
|
||
addStopBits(bits, bitCount);
|
||
}
|
||
|
||
void BaudotEncoder::addStartBits(unsigned& bits, unsigned int& bitCount) const
|
||
{
|
||
// Start bit is 0
|
||
addBits(bits, bitCount, 0, m_startBits);
|
||
}
|
||
|
||
void BaudotEncoder::addStopBits(unsigned& bits, unsigned int& bitCount) const
|
||
{
|
||
// Stop bit is 1
|
||
addBits(bits, bitCount, ((1 << m_stopBits)) - 1, m_stopBits);
|
||
}
|
||
|
||
void BaudotEncoder::addBits(unsigned& bits, unsigned int& bitCount, int data, int count) const
|
||
{
|
||
bits |= data << bitCount;
|
||
bitCount += count;
|
||
}
|
||
|
||
unsigned BaudotEncoder::reverseBits(unsigned bits, unsigned int count) const
|
||
{
|
||
if (m_msbFirst) {
|
||
return BaudotEncoder::reverse(bits) >> (sizeof(unsigned int) * 8 - count);
|
||
} else {
|
||
return bits;
|
||
}
|
||
}
|
||
|
||
unsigned int BaudotEncoder::reverse(unsigned int x)
|
||
{
|
||
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
|
||
x = (((x & 0xcccccccc) >> 2) | ((x & 0x33333333) << 2));
|
||
x = (((x & 0xf0f0f0f0) >> 4) | ((x & 0x0f0f0f0f) << 4));
|
||
x = (((x & 0xff00ff00) >> 8) | ((x & 0x00ff00ff) << 8));
|
||
|
||
return((x >> 16) | (x << 16));
|
||
}
|