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js8call/varicode.cpp

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/**
* This file is part of JS8Call.
*
* 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 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* (C) 2018 Jordan Sherer <kn4crd@gmail.com> - All Rights Reserved
*
**/
#include <QDebug>
#include <QMap>
#include <QSet>
#define CRCPP_INCLUDE_ESOTERIC_CRC_DEFINITIONS
#include "crc.h"
#include "varicode.h"
#include "jsc.h"
#include <cmath>
const int nalphabet = 41;
QString alphabet = {"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-./?"}; // alphabet to encode _into_ for FT8 freetext transmission
QString alphabet72 = {"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz-+/?."};
QString grid_pattern = {R"((?<grid>[A-X]{2}[0-9]{2}(?:[A-X]{2}(?:[0-9]{2})?)*)+)"};
QString orig_compound_callsign_pattern = {R"((?<callsign>(\d|[A-Z])+\/?((\d|[A-Z]){2,})(\/(\d|[A-Z])+)?(\/(\d|[A-Z])+)?))"};
QString base_callsign_pattern = {R"((?<callsign>\b(?<base>([0-9A-Z])?([0-9A-Z])([0-9])([A-Z])?([A-Z])?([A-Z])?)\b))"};
//QString compound_callsign_pattern = {R"((?<callsign>\b(?<prefix>[A-Z0-9]{1,4}\/)?(?<base>([0-9A-Z])?([0-9A-Z])([0-9])([A-Z])?([A-Z])?([A-Z])?)(?<suffix>\/[A-Z0-9]{1,4})?)\b)"};
QString compound_callsign_pattern = {R"((?<callsign>(?:[@]?|\b)(?<extended>[A-Z0-9\/@][A-Z0-9\/]{0,2}[\/]?[A-Z0-9\/]{0,3}[\/]?[A-Z0-9\/]{0,3})\b))"};
QString pack_callsign_pattern = {R"(([0-9A-Z ])([0-9A-Z])([0-9])([A-Z ])([A-Z ])([A-Z ]))"};
QString alphanumeric = {"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ /@"}; // callsign and grid alphabet
QMap<QString, int> directed_cmds = {
// any changes here need to be made also in the directed regular xpression for parsing
// ?*^&@
{" SNR?", 0 }, // query snr
{"?", 0 }, // compat
{" QTH?", 1 }, // query qth
{"@", 1 }, // compat
{" QTC?", 2 }, // query station message
{"&", 2 }, // compat
{" GRID?", 4 }, // query grid
{"^", 4 }, // compat
{" STATUS?", 6 }, // query idle message
{"*", 6 }, // compat
{">", 5 }, // relay message
{"#", 8 }, // all or nothing message
//{"!", 7 }, // alert message
//{"$", 3 }, // query station(s) heard
//{"=", 9 }, // unused
{" ACTIVE", 10 }, // i have been active in the past 10 minutes
{" IDLE", 11 }, // i have not been active in the past 10 minutes
{" HEARTBEAT", -1 }, // this is my ping (unused except for faux processing of pings as directed commands)
{" HEARTBEAT ACK", 12 }, // i acknowledge your ping at this SNR
{" HEARTBEAT REQ", 13 }, // can you transmit a ping to callsign?
{" APRS:", 14 }, // send an aprs packet
{" GRID", 15 }, // this is my current grid locator
{" QTC", 16 }, // this is my qtc message
{" QTH", 17 }, // this is my qth message
{" FB", 18 }, // fine business
{" HW CPY?", 19 }, // how do you copy?
{" SK", 20 }, // end of contact
{" RR", 21 }, // roger roger
{" QSL?", 22 }, // do you copy?
{" QSL", 23 }, // i copy
{" QRZ?", 24 }, // who is calling me
{" SNR", 25 }, // seen a station at the provided snr
{" NO", 26 }, // negative confirm
{" YES", 27 }, // confirm
{" 73", 28 }, // best regards, end of contact
{" ACK", 29 }, // acknowledge
{" AGN?", 30 }, // repeat message
{" ", 31 }, // send freetext
};
QSet<int> allowed_cmds = {-1, 0, 1, 2, 3, 4, 5, 6, /*7,*/ 8, /*9,*/ 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31};
QSet<int> buffered_cmds = {3, 5, /*6,*/ /*7,*/ 8, 13, 14, 15};
QSet<int> snr_cmds = {12, 25};
QMap<int, int> checksum_cmds = {
{ 5, 16 },
{ 8, 16 },
{ 13, 16 },
{ 14, 16 },
{ 15, 0 }
};
QString callsign_pattern = QString("(?<callsign>[@]?[A-Z0-9/]+)");
QString optional_cmd_pattern = QString("(?<cmd>\\s?(?:HEARTBEAT (ACK|REQ)|AGN[?]|QSL[?]|HW CPY[?]|APRS[:]|QRZ[?]|SNR[?]|QTC[?]|QTH[?]|GRID[?]|STATUS[?]|(?:(?:ACK|73|YES|NO|SNR|QSL|RR|SK|FB|QTH|QTC|GRID|ACTIVE|IDLE)(?=[ ]|$))|[?*^&@#> ]))?");
QString optional_grid_pattern = QString("(?<grid>\\s?[A-R]{2}[0-9]{2})?");
QString optional_extended_grid_pattern = QString("^(?<grid>\\s?(?:[A-R]{2}[0-9]{2}(?:[A-X]{2}(?:[0-9]{2})?)*))?");
QString optional_num_pattern = QString("(?<num>(?<=SNR|HEARTBEAT ACK)\\s?[-+]?(?:3[01]|[0-2]?[0-9]))?");
QRegularExpression directed_re("^" +
callsign_pattern +
optional_cmd_pattern +
optional_num_pattern);
QRegularExpression heartbeat_re(R"(^\s*(?<type>CQCQCQ|CQ QRPP?|CQ DX|CQ TEST|CQ( CQ){0,2}|HEARTBEAT)(?:\s(?<grid>[A-R]{2}[0-9]{2}))?\b)");
QRegularExpression compound_re("^\\s*[`]" +
callsign_pattern +
"(?<extra>" +
optional_grid_pattern + // there's a reason this is first (see: buildMessageFrames)
optional_cmd_pattern +
optional_num_pattern +
")");
QMap<QString, QString> hufftable = {
// char code weight
{ " " , "01" }, // 1.0
{ "E" , "100" }, // 0.5
{ "T" , "1101" }, // 0.333333333333
{ "A" , "0011" }, // 0.25
{ "O" , "11111" }, // 0.2
{ "I" , "11100" }, // 0.166666666667
{ "N" , "10111" }, // 0.142857142857
{ "S" , "10100" }, // 0.125
{ "H" , "00011" }, // 0.111111111111
{ "R" , "00000" }, // 0.1
{ "D" , "111011" }, // 0.0909090909091
{ "L" , "110011" }, // 0.0833333333333
{ "C" , "110001" }, // 0.0769230769231
{ "U" , "101101" }, // 0.0714285714286
{ "M" , "101011" }, // 0.0666666666667
{ "W" , "001011" }, // 0.0625
{ "F" , "001001" }, // 0.0588235294118
{ "G" , "000101" }, // 0.0555555555556
{ "Y" , "000011" }, // 0.0526315789474
{ "P" , "1111011" }, // 0.05
{ "B" , "1111001" }, // 0.047619047619
{ "." , "1110100" }, // 0.0434782608696
{ "V" , "1100101" }, // 0.0416666666667
{ "K" , "1100100" }, // 0.04
{ "-" , "1100001" }, // 0.0384615384615
{ "+" , "1100000" }, // 0.037037037037
{ "?" , "1011001" }, // 0.0344827586207
{ "!" , "1011000" }, // 0.0333333333333
{"\"" , "1010101" }, // 0.0322580645161
{ "X" , "1010100" }, // 0.03125
{ "0" , "0010101" }, // 0.030303030303
{ "J" , "0010100" }, // 0.0294117647059
{ "1" , "0010001" }, // 0.0285714285714
{ "Q" , "0010000" }, // 0.0277777777778
{ "2" , "0001001" }, // 0.027027027027
{ "Z" , "0001000" }, // 0.0263157894737
{ "3" , "0000101" }, // 0.025641025641
{ "5" , "0000100" }, // 0.025
{ "4" , "11110101" }, // 0.0243902439024
{ "9" , "11110100" }, // 0.0238095238095
{ "8" , "11110001" }, // 0.0232558139535
{ "6" , "11110000" }, // 0.0227272727273
{ "7" , "11101011" }, // 0.0222222222222
{ "/" , "11101010" }, // 0.0217391304348
};
QChar ESC = '\\'; // Escape char
QChar EOT = '\x04'; // EOT char
quint32 nbasecall = 37 * 36 * 10 * 27 * 27 * 27;
quint16 nbasegrid = 180 * 180;
quint16 nusergrid = nbasegrid + 10;
quint16 nmaxgrid = (1<<15)-1;
QMap<QString, quint32> basecalls = {
{ "<....>", nbasecall + 1 }, // incomplete callsign
{ "@ALLCALL", nbasecall + 2 }, // ALLCALL group
};
QMap<quint32, QString> cqs = {
{ 0, "CQCQCQ" },
{ 1, "CQ DX" },
{ 2, "CQ QRP" },
{ 3, "CQ TEST" },
{ 4, "CQ QRPP" },
{ 5, "CQ"},
{ 6, "CQ CQ"},
{ 7, "CQ CQ CQ"},
};
QMap<int, int> dbm2mw = {
{0 , 1}, // 1mW
{3 , 2}, // 2mW
{7 , 5}, // 5mW
{10 , 10}, // 10mW
{13 , 20}, // 20mW
{17 , 50}, // 50mW
{20 , 100}, // 100mW
{23 , 200}, // 200mW
{27 , 500}, // 500mW
{30 , 1000}, // 1W
{33 , 2000}, // 2W
{37 , 5000}, // 5W
{40 , 10000}, // 10W
{43 , 20000}, // 20W
{47 , 50000}, // 50W
{50 , 100000}, // 100W
{53 , 200000}, // 200W
{57 , 500000}, // 500W
{60 , 1000000}, // 1000W
};
/*
* UTILITIES
*/
int mwattsToDbm(int mwatts){
int dbm = 0;
auto values = dbm2mw.values();
qSort(values);
foreach(auto mw, values){
if(mw < mwatts){ continue; }
dbm = dbm2mw.key(mw);
break;
}
return dbm;
}
int dbmTomwatts(int dbm){
if(dbm2mw.contains(dbm)){
return dbm2mw[dbm];
}
auto iter = dbm2mw.lowerBound(dbm);
if(iter == dbm2mw.end()){
return dbm2mw.last();
}
return iter.value();
}
QString Varicode::rstrip(const QString& str) {
int n = str.size() - 1;
for (; n >= 0; --n) {
if (str.at(n).isSpace()) {
continue;
}
return str.left(n + 1);
}
return "";
}
QString Varicode::lstrip(const QString& str) {
int len = str.size();
for (int n = 0; n < len; n++) {
if(str.at(n).isSpace()){
continue;
}
return str.mid(n);
}
return "";
}
/*
* VARICODE
*/
QMap<QString, QString> Varicode::defaultHuffTable(){
return hufftable;
}
QString Varicode::cqString(int number){
if(!cqs.contains(number)){
return QString{};
}
return cqs[number];
}
bool Varicode::startsWithCQ(QString text){
foreach(auto cq, cqs.values()){
if(text.startsWith(cq)){
return true;
}
}
return false;
}
QString Varicode::formatSNR(int snr){
if(snr < -60 || snr > 60){
return QString();
}
return QString("%1%2").arg(snr >= 0 ? "+" : "").arg(snr, snr < 0 ? 3 : 2, 10, QChar('0'));
}
QString Varicode::checksum16(QString const &input){
auto fromBytes = input.toLocal8Bit();
auto crc = CRC::Calculate(fromBytes.data(), fromBytes.length(), CRC::CRC_16_KERMIT());
auto checksum = Varicode::pack16bits(crc);
if(checksum.length() < 3){
checksum += QString(" ").repeated(3-checksum.length());
}
return checksum;
}
bool Varicode::checksum16Valid(QString const &checksum, QString const &input){
auto fromBytes = input.toLocal8Bit();
auto crc = CRC::Calculate(fromBytes.data(), fromBytes.length(), CRC::CRC_16_KERMIT());
return Varicode::pack16bits(crc) == checksum;
}
QString Varicode::checksum32(QString const &input){
auto fromBytes = input.toLocal8Bit();
auto crc = CRC::Calculate(fromBytes.data(), fromBytes.length(), CRC::CRC_32_BZIP2());
auto checksum = Varicode::pack32bits(crc);
if(checksum.length() < 6){
checksum += QString(" ").repeated(6-checksum.length());
}
return checksum;
}
bool Varicode::checksum32Valid(QString const &checksum, QString const &input){
auto fromBytes = input.toLocal8Bit();
auto crc = CRC::Calculate(fromBytes.data(), fromBytes.length(), CRC::CRC_32_BZIP2());
return Varicode::pack32bits(crc) == checksum;
}
QStringList Varicode::parseCallsigns(QString const &input){
QStringList callsigns;
QRegularExpression re(compound_callsign_pattern);
QRegularExpressionMatchIterator iter = re.globalMatch(input);
while(iter.hasNext()){
QRegularExpressionMatch match = iter.next();
if(!match.hasMatch()){
continue;
}
QString callsign = match.captured("callsign").trimmed();
if(!Varicode::isValidCallsign(callsign, nullptr)){
continue;
}
QRegularExpression m(grid_pattern);
if(m.match(callsign).hasMatch()){
continue;
}
callsigns.append(callsign);
}
return callsigns;
}
QStringList Varicode::parseGrids(const QString &input){
QStringList grids;
QRegularExpression re(grid_pattern);
QRegularExpressionMatchIterator iter = re.globalMatch(input);
while(iter.hasNext()){
QRegularExpressionMatch match = iter.next();
if(!match.hasMatch()){
continue;
}
auto grid = match.captured("grid");
if(grid == "RR73"){
continue;
}
grids.append(grid);
}
return grids;
}
QList<QPair<int, QVector<bool>>> Varicode::huffEncode(const QMap<QString, QString> &huff, QString const& text){
QList<QPair<int, QVector<bool>>> out;
int i = 0;
auto keys = huff.keys();
qSort(keys.begin(), keys.end(), [](QString const &a, QString const &b){
auto alen = a.length();
auto blen = b.length();
if(blen < alen){
return true;
}
if(alen < blen){
return false;
}
return b < a;
});
while(i < text.length()){
bool found = false;
foreach(auto ch, keys){
if(text.midRef(i).startsWith(ch)){
out.append({ ch.length(), Varicode::strToBits(huff[ch])});
i += ch.length();
found = true;
break;
}
}
if(!found){
i++;
}
}
return out;
}
QString Varicode::huffDecode(QMap<QString, QString> const &huff, QVector<bool> const& bitvec){
QString text;
QString bits = Varicode::bitsToStr(bitvec); //.mid(0, bitvec.length()-pad);
// TODO: jsherer - this is naive...
while(bits.length() > 0){
bool found = false;
foreach(auto key, huff.keys()){
if(bits.startsWith(huff[key])){
if(key == EOT){
text.append(" ");
found = false;
break;
}
text.append(key);
bits = bits.mid(huff[key].length());
found = true;
}
}
if(!found){
break;
}
}
return text;
}
QSet<QString> Varicode::huffValidChars(const QMap<QString, QString> &huff){
return QSet<QString>::fromList(huff.keys());
}
// convert char* array of 0 bytes and 1 bytes to bool vector
QVector<bool> Varicode::bytesToBits(char *bitvec, int n){
QVector<bool> bits;
for(int i = 0; i < n; i++){
bits.append(bitvec[i] == 0x01);
}
return bits;
}
// convert string of 0s and 1s to bool vector
QVector<bool> Varicode::strToBits(QString const& bitvec){
QVector<bool> bits;
foreach(auto ch, bitvec){
bits.append(ch == '1');
}
return bits;
}
QString Varicode::bitsToStr(QVector<bool> const& bitvec){
QString bits;
foreach(auto bit, bitvec){
bits.append(bit ? "1" : "0");
}
return bits;
}
QVector<bool> Varicode::intToBits(quint64 value, int expected){
QVector<bool> bits;
while(value){
bits.prepend((bool)(value & 1));
value = value >> 1;
}
if(expected){
while(bits.count() < expected){
bits.prepend((bool) 0);
}
}
return bits;
}
quint64 Varicode::bitsToInt(QVector<bool> const value){
quint64 v = 0;
foreach(bool bit, value){
v = (v << 1) + (int)(bit);
}
return v;
}
quint64 Varicode::bitsToInt(QVector<bool>::ConstIterator start, int n){
quint64 v = 0;
for(int i = 0; i < n; i++){
int bit = (int)(*start);
v = (v << 1) + (int)(bit);
start++;
}
return v;
}
QVector<bool> Varicode::bitsListToBits(QList<QVector<bool>> &list){
QVector<bool> out;
foreach(auto vec, list){
out += vec;
}
return out;
}
quint8 Varicode::unpack5bits(QString const& value){
return alphabet.indexOf(value.at(0));
}
// pack a 5-bit value from 0 to 31 into a single character
QString Varicode::pack5bits(quint8 packed){
return alphabet.at(packed % 32);
}
quint8 Varicode::unpack6bits(QString const& value){
return alphabet.indexOf(value.at(0));
}
// pack a 6-bit value from 0 to 40 into a single character
QString Varicode::pack6bits(quint8 packed){
return alphabet.at(packed % 41);
}
quint16 Varicode::unpack16bits(QString const& value){
int a = alphabet.indexOf(value.at(0));
int b = alphabet.indexOf(value.at(1));
int c = alphabet.indexOf(value.at(2));
int unpacked = (nalphabet * nalphabet) * a + nalphabet * b + c;
if(unpacked > (1<<16)-1){
// BASE-41 can produce a value larger than 16 bits... ala "???" == 70643
return 0;
}
return unpacked & ((1<<16)-1);
}
// pack a 16-bit value into a three character sequence
QString Varicode::pack16bits(quint16 packed){
QString out;
quint16 tmp = packed / (nalphabet * nalphabet);
out.append(alphabet.at(tmp));
tmp = (packed - (tmp * (nalphabet * nalphabet))) / nalphabet;
out.append(alphabet.at(tmp));
tmp = packed % nalphabet;
out.append(alphabet.at(tmp));
return out;
}
quint32 Varicode::unpack32bits(QString const& value){
return (quint32)(unpack16bits(value.left(3))) << 16 | unpack16bits(value.right(3));
}
QString Varicode::pack32bits(quint32 packed){
quint16 a = (packed & 0xFFFF0000) >> 16;
quint16 b = packed & 0xFFFF;
return pack16bits(a) + pack16bits(b);
}
quint64 Varicode::unpack64bits(QString const& value){
return (quint64)(unpack32bits(value.left(6))) << 32 | unpack32bits(value.right(6));
}
QString Varicode::pack64bits(quint64 packed){
quint32 a = (packed & 0xFFFFFFFF00000000) >> 32;
quint32 b = packed & 0xFFFFFFFF;
return pack32bits(a) + pack32bits(b);
}
// returns the first 64 bits and sets the last 8 bits in pRem
quint64 Varicode::unpack72bits(QString const& text, quint8 *pRem){
quint64 value = 0;
quint8 rem = 0;
quint8 mask2 = ((1<<2)-1);
for(int i = 0; i < 10; i++){
value |= (quint64)(alphabet72.indexOf(text.at(i))) << (58-6*i);
}
quint8 remHigh = alphabet72.indexOf(text.at(10));
value |= remHigh >> 2;
quint8 remLow = alphabet72.indexOf(text.at(11));
rem = ((remHigh & mask2) << 6) | remLow;
if(pRem) *pRem = rem;
return value;
}
QString Varicode::pack72bits(quint64 value, quint8 rem){
QChar packed[12]; // 12 x 6bit characters
quint8 mask4 = ((1<<4)-1);
quint8 mask6 = ((1<<6)-1);
quint8 remHigh = ((value & mask4) << 2) | (rem >> 6);
quint8 remLow = rem & mask6;
value = value >> 4;
packed[11] = alphabet72.at(remLow);
packed[10] = alphabet72.at(remHigh);
for(int i = 0; i < 10; i++){
packed[9-i] = alphabet72.at(value & mask6);
value = value >> 6;
}
return QString(packed, 12);
}
// //
// --- //
// //
// pack a 4-digit alpha-numeric + space into a 22 bit value
// 21 bits for the data + 1 bit for a flag indicator
// giving us a total of 5.5 bits per character
quint32 Varicode::packAlphaNumeric22(QString const& value, bool isFlag){
QString word = QString(value).replace(QRegExp("[^A-Z0-9/ ]"), "");
if(word.length() < 4){
word = word + QString(" ").repeated(4-word.length());
}
quint32 a = 38 * 38 * 38 * alphanumeric.indexOf(word.at(0));
quint32 b = 38 * 38 * alphanumeric.indexOf(word.at(1));
quint32 c = 38 * alphanumeric.indexOf(word.at(2));
quint32 d = alphanumeric.indexOf(word.at(3));
quint32 packed = a + b + c + d;
packed = (packed << 1) + (int)isFlag;
return packed;
}
QString Varicode::unpackAlphaNumeric22(quint32 packed, bool *isFlag){
QChar word[4];
if(isFlag) *isFlag = packed & 1;
packed = packed >> 1;
quint32 tmp = packed % 38;
word[3] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[2] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[1] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[0] = alphanumeric.at(tmp);
packed = packed / 38;
return QString(word, 4);
}
// pack a 10-digit alpha-numeric + space + forward-slash into a 50 bit value
// optionally start with an @
//
// [39][38][38][02][38][38][38][02][38][38][38]
// [K] [N] [4] [ ] [C] [R] [D] [/] [Q] [R] [P]
// [V] [E] [3] [/] [L] [B] [9] [ ] [Y] [H] [X]
// [@] [R] [A] [ ] [C] [E] [S] [ ] [ ] [ ] [ ]
//
// giving us a total of 4.5-5.55 bits per character
quint64 Varicode::packAlphaNumeric50(QString const& value){
QString word = QString(value).replace(QRegExp("[^A-Z0-9 /@]"), "");
if(word.length() > 3 && word.at(3) != '/'){
word.insert(3, ' ');
}
if(word.length() > 7 && word.at(7) != '/'){
word.insert(7, ' ');
}
if(word.length() < 11){
word = word + QString(" ").repeated(11-word.length());
}
quint64 a = (quint64)38 * 38 * 38 * 2 * 38 * 38 * 38 * 2 * 38 * 38 * alphanumeric.indexOf(word.at(0));
quint64 b = (quint64)38 * 38 * 38 * 2 * 38 * 38 * 38 * 2 * 38 * alphanumeric.indexOf(word.at(1));
quint64 c = (quint64)38 * 38 * 38 * 2 * 38 * 38 * 38 * 2 * alphanumeric.indexOf(word.at(2));
quint64 d = (quint64)38 * 38 * 38 * 2 * 38 * 38 * 38 * (int)(word.at(3) == '/');
quint64 e = (quint64)38 * 38 * 38 * 2 * 38 * 38 * alphanumeric.indexOf(word.at(4));
quint64 f = (quint64)38 * 38 * 38 * 2 * 38 * alphanumeric.indexOf(word.at(5));
quint64 g = (quint64)38 * 38 * 38 * 2 * alphanumeric.indexOf(word.at(6));
quint64 h = (quint64)38 * 38 * 38 * (int)(word.at(7) == '/');
quint64 i = (quint64)38 * 38 * alphanumeric.indexOf(word.at(8));
quint64 j = (quint64)38 * alphanumeric.indexOf(word.at(9));
quint64 k = (quint64)alphanumeric.indexOf(word.at(10));
quint64 packed = a + b + c + d + e + f + g + h + i + j + k;
return packed;
}
QString Varicode::unpackAlphaNumeric50(quint64 packed){
QChar word[11];
quint64 tmp = packed % 38;
word[10] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[9] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[8] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 2;
word[7] = tmp ? '/' : ' ';
packed = packed / 2;
tmp = packed % 38;
word[6] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[5] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[4] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 2;
word[3] = tmp ? '/' : ' ';
packed = packed / 2;
tmp = packed % 38;
word[2] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 38;
word[1] = alphanumeric.at(tmp);
packed = packed / 38;
tmp = packed % 39;
word[0] = alphanumeric.at(tmp);
packed = packed / 39;
auto value = QString(word, 11);
return value.replace(" ", "");
}
// pack a callsign into a 28-bit value
quint32 Varicode::packCallsign(QString const& value){
quint32 packed = 0;
QString callsign = value.toUpper().trimmed();
if(basecalls.contains(callsign)){
return basecalls[callsign];
}
// workaround for swaziland
if(callsign.startsWith("3DA0")){
callsign = "3D0" + callsign.mid(4);
}
// workaround for guinea
if(callsign.startsWith("3X") && 'A' <= callsign.at(2) && callsign.at(2) <= 'Z'){
callsign = "Q" + callsign.mid(2);
}
int slen = callsign.length();
if(slen < 2){
return packed;
}
if(slen > 6){
return packed;
}
QStringList permutations = { callsign };
if(slen == 2){
permutations.append(" " + callsign + " ");
}
if(slen == 3){
permutations.append(" " + callsign + " ");
permutations.append(callsign + " ");
}
if(slen == 4){
permutations.append(" " + callsign + " ");
permutations.append(callsign + " ");
}
if(slen == 5){
permutations.append(" " + callsign);
permutations.append(callsign + " ");
}
QString matched;
QRegularExpression m(pack_callsign_pattern);
foreach(auto permutation, permutations){
auto match = m.match(permutation);
if(match.hasMatch()){
matched = match.captured(0);
}
}
if(matched.isEmpty()){
return packed;
}
if(matched.length() < 6){
return packed;
}
packed = alphanumeric.indexOf(matched.at(0));
packed = 36*packed + alphanumeric.indexOf(matched.at(1));
packed = 10*packed + alphanumeric.indexOf(matched.at(2));
packed = 27*packed + alphanumeric.indexOf(matched.at(3)) - 10;
packed = 27*packed + alphanumeric.indexOf(matched.at(4)) - 10;
packed = 27*packed + alphanumeric.indexOf(matched.at(5)) - 10;
return packed;
}
QString Varicode::unpackCallsign(quint32 value){
foreach(auto key, basecalls.keys()){
if(basecalls[key] == value){
return key;
}
}
QChar word[6];
quint32 tmp = value % 27 + 10;
word[5] = alphanumeric.at(tmp);
value = value/27;
tmp = value % 27 + 10;
word[4] = alphanumeric.at(tmp);
value = value/27;
tmp = value % 27 + 10;
word[3] = alphanumeric.at(tmp);
value = value/27;
tmp = value % 10;
word[2] = alphanumeric.at(tmp);
value = value/10;
tmp = value % 36;
word[1] = alphanumeric.at(tmp);
value = value/36;
tmp = value;
word[0] = alphanumeric.at(tmp);
QString callsign(word, 6);
if(callsign.startsWith("3D0")){
callsign = "3DA0" + callsign.mid(3);
}
if(callsign.startsWith("Q") and 'A' <= callsign.at(1) && callsign.at(1) <= 'Z'){
callsign = "3X" + callsign.mid(1);
}
return callsign;
}
QString Varicode::deg2grid(float dlong, float dlat){
QChar grid[6];
if(dlong < -180){
dlong += 360;
}
if(dlong > 180){
dlong -= 360;
}
int nlong = int(60.0*(180.0-dlong)/5);
int n1 = nlong/240;
int n2 = (nlong-240*n1)/24;
int n3 = (nlong-240*n1-24*n2);
grid[0] = QChar('A' + n1);
grid[2] = QChar('0' + n2);
grid[4] = QChar('a' + n3);
int nlat=int(60.0*(dlat+90)/2.5);
n1 = nlat/240;
n2 = (nlat-240*n1)/24;
n3 = (nlat-240*n1-24*n2);
grid[1] = QChar('A' + n1);
grid[3] = QChar('0' + n2);
grid[5] = QChar('a' + n3);
return QString(grid, 6);
}
QPair<float, float> Varicode::grid2deg(QString const &grid){
QPair<float, float> longLat;
QString g = grid;
if(g.length() < 6){
g = grid.left(4) + "mm";
}
g = g.left(4).toUpper() + g.right(2).toLower();
int nlong = 180 - 20 * (g.at(0).toLatin1() - 'A');
int n20d = 2 * (g.at(2).toLatin1() - '0');
float xminlong = 5 * (g.at(4).toLatin1() - 'a' + 0.5);
float dlong = nlong - n20d - xminlong/60.0;
int nlat = -90 + 10*(g.at(1).toLatin1() - 'A') + g.at(3).toLatin1() - '0';
float xminlat = 2.5 * (g.at(5).toLatin1() - 'a' + 0.5);
float dlat = nlat + xminlat/60.0;
longLat.first = dlong;
longLat.second = dlat;
return longLat;
}
// pack a 4-digit maidenhead grid locator into a 15-bit value
quint16 Varicode::packGrid(QString const& value){
QString grid = QString(value).trimmed();
if(grid.length() < 4){
return (1<<15)-1;
}
auto pair = Varicode::grid2deg(grid.left(4));
int ilong = pair.first;
int ilat = pair.second + 90;
return ((ilong + 180)/2) * 180 + ilat;
}
QString Varicode::unpackGrid(quint16 value){
if(value > nbasegrid){
return "";
}
float dlat = value % 180 - 90;
float dlong = value / 180 * 2 - 180 + 2;
return Varicode::deg2grid(dlong, dlat).left(4);
}
// pack a number or snr into an integer between 0 & 62
quint8 Varicode::packNum(QString const &num, bool *ok){
int inum = 0;
if(num.isEmpty()){
if(ok) *ok = false;
return inum;
}
inum = qMax(-30, qMin(num.toInt(ok, 10), 31));
return inum + 30 + 1;
}
// pack a reduced fidelity command and a number into the extra bits provided between nbasegrid and nmaxgrid
quint8 Varicode::packCmd(quint8 cmd, quint8 num, bool *pPackedNum){
//quint8 allowed = nmaxgrid - nbasegrid - 1;
// if cmd == snr
quint8 value = 0;
auto cmdStr = directed_cmds.key(cmd);
if(Varicode::isSNRCommand(cmdStr)){
// 8 bits - 1 bit flag + 1 bit type + 6 bit number
// [1][X][6]
// X = 0 == SNR
// X = 1 == ACK
value = ((1 << 1) | (int)(cmdStr == " HEARTBEAT ACK")) << 6;
value = value + (num & ((1<<6)-1));
if(pPackedNum) *pPackedNum = true;
} else {
value = cmd & ((1<<7)-1);
if(pPackedNum) *pPackedNum = false;
}
return value;
}
quint8 Varicode::unpackCmd(quint8 value, quint8 *pNum){
// if the first bit is 1, this is an SNR with a number encoded in the lower 6 bits
if(value & (1<<7)){
if(pNum) *pNum = value & ((1<<6)-1);
auto cmd = directed_cmds[" SNR"];
if(value & (1<<6)){
cmd = directed_cmds[" HEARTBEAT ACK"];
}
return cmd;
} else {
if(pNum) *pNum = 0;
return value & ((1<<7)-1);
}
}
bool Varicode::isSNRCommand(const QString &cmd){
return directed_cmds.contains(cmd) && snr_cmds.contains(directed_cmds[cmd]);
}
bool Varicode::isCommandAllowed(const QString &cmd){
return directed_cmds.contains(cmd) && allowed_cmds.contains(directed_cmds[cmd]);
}
bool Varicode::isCommandBuffered(const QString &cmd){
return directed_cmds.contains(cmd) && (cmd.contains(" ") || buffered_cmds.contains(directed_cmds[cmd]));
}
int Varicode::isCommandChecksumed(const QString &cmd){
if(!directed_cmds.contains(cmd) || !checksum_cmds.contains(directed_cmds[cmd])){
return 0;
}
return checksum_cmds[directed_cmds[cmd]];
}
bool isValidCompoundCallsign(QStringRef callsign){
// compound calls cannot be > 9 characters after removing the /
if(callsign.toString().replace("/", "").length() > 9){
return false;
}
// compound is valid when it is:
// 1) a group call (starting with @)
// 2) an actual compound call (containing /) that is not a base call
// 3) is greater than two characters and has an alphanumeric character sequence
//
// this is so arbitrary words < 10 characters in length don't end up coded as callsigns
if(callsign.contains("/")){
auto base = callsign.toString().left(callsign.indexOf("/"));
return !basecalls.contains(base);
}
if(callsign.startsWith("@")){
return true;
}
if(callsign.length() > 2 && QRegularExpression("[0-9][A-Z]|[A-Z][0-9]").match(callsign).hasMatch()){
return true;
}
return false;
}
bool Varicode::isValidCallsign(const QString &callsign, bool *pIsCompound){
if(basecalls.contains(callsign)){
if(pIsCompound) *pIsCompound = false;
return true;
}
auto match = QRegularExpression(base_callsign_pattern).match(callsign);
if(match.hasMatch() && (match.capturedLength() == callsign.length())){
if(pIsCompound) *pIsCompound = false;
return callsign.length() > 2 && QRegularExpression("[0-9][A-Z]|[A-Z][0-9]").match(callsign).hasMatch();
}
match = QRegularExpression("^" + compound_callsign_pattern).match(callsign);
if(match.hasMatch() && (match.capturedLength() == callsign.length())){
bool isValid = isValidCompoundCallsign(match.capturedRef(0));
qDebug() << "is valid compound??" << match.capturedRef(0) << isValid;
if(pIsCompound) *pIsCompound = isValid;
return isValid;
}
if(pIsCompound) *pIsCompound = false;
return false;
}
bool Varicode::isCompoundCallsign(const QString &callsign){
if(basecalls.contains(callsign)){
return false;
}
auto match = QRegularExpression(base_callsign_pattern).match(callsign);
if(match.hasMatch() && (match.capturedLength() == callsign.length())){
return false;
}
match = QRegularExpression("^" + compound_callsign_pattern).match(callsign);
if(!match.hasMatch() || (match.capturedLength() != callsign.length())){
return false;
}
bool isValid = isValidCompoundCallsign(match.capturedRef(0));
qDebug() << "is valid compound?" << match.capturedRef(0) << isValid;
return isValid;
}
// CQCQCQ EM73
// CQ DX EM73
// CQ QRP EM73
// HEARTBEAT EM73
QString Varicode::packHeartbeatMessage(QString const &text, const QString &callsign, int *n){
QString frame;
auto parsedText = heartbeat_re.match(text);
if(!parsedText.hasMatch()){
if(n) *n = 0;
return frame;
}
auto extra = parsedText.captured("grid");
// Heartbeat Alt Type
// ---------------
// 1 0 HEARTBEAT
// 1 1 CQCQCQ
auto type = parsedText.captured("type");
auto isAlt = type.startsWith("CQ");
if(callsign.isEmpty()){
if(n) *n = 0;
return frame;
}
quint16 packed_extra = nmaxgrid; // which will display an empty string
if(extra.length() == 4 && QRegularExpression(grid_pattern).match(extra).hasMatch()){
packed_extra = Varicode::packGrid(extra);
}
if(isAlt){
packed_extra |= (1<<15);
}
quint8 cqNumber = cqs.key(type, 0);
frame = packCompoundFrame(callsign, FrameHeartbeat, packed_extra, cqNumber);
if(frame.isEmpty()){
if(n) *n = 0;
return frame;
}
if(n) *n = parsedText.captured(0).length();
return frame;
}
QStringList Varicode::unpackHeartbeatMessage(const QString &text, quint8 *pType, bool * isAlt, quint8 * pBits3){
quint8 type = FrameHeartbeat;
quint16 num = nmaxgrid;
quint8 bits3 = 0;
QStringList unpacked = unpackCompoundFrame(text, &type, &num, &bits3);
if(unpacked.isEmpty() || type != FrameHeartbeat){
return QStringList{};
}
unpacked.append(Varicode::unpackGrid(num & ((1<<15)-1)));
if(isAlt) *isAlt = (num & (1<<15));
if(pType) *pType = type;
if(pBits3) *pBits3 = bits3;
return unpacked;
}
// KN4CRD/XXXX EM73
// XXXX/KN4CRD EM73
// KN4CRD/P
QString Varicode::packCompoundMessage(QString const &text, int *n){
QString frame;
qDebug() << "trying to pack compound message" << text;
auto parsedText = compound_re.match(text);
if(!parsedText.hasMatch()){
qDebug() << "no match for compound message" << text;
if(n) *n = 0;
return frame;
}
qDebug() << parsedText.capturedTexts();
QString callsign = parsedText.captured("callsign");
QString grid = parsedText.captured("grid");
QString cmd = parsedText.captured("cmd");
QString num = parsedText.captured("num").trimmed();
if(callsign.isEmpty()){
if(n) *n = 0;
return frame;
}
quint8 type = FrameCompound;
quint16 extra = nmaxgrid;
qDebug() << "try pack cmd" << cmd << directed_cmds.contains(cmd) << Varicode::isCommandAllowed(cmd);
if (!cmd.isEmpty() && directed_cmds.contains(cmd) && Varicode::isCommandAllowed(cmd)){
bool packedNum = false;
qint8 inum = Varicode::packNum(num, nullptr);
extra = nusergrid + Varicode::packCmd(directed_cmds[cmd], inum, &packedNum);
type = FrameCompoundDirected;
} else if(!grid.isEmpty()){
extra = Varicode::packGrid(grid);
}
frame = Varicode::packCompoundFrame(callsign, type, extra, 0);
if(n) *n = parsedText.captured(0).length();
return frame;
}
QStringList Varicode::unpackCompoundMessage(const QString &text, quint8 *pType, quint8 *pBits3){
quint8 type = FrameCompound;
quint16 extra = nmaxgrid;
quint8 bits3 = 0;
QStringList unpacked = unpackCompoundFrame(text, &type, &extra, &bits3);
if(unpacked.isEmpty() || (type != FrameCompound && type != FrameCompoundDirected)){
return QStringList {};
}
if(extra <= nbasegrid){
unpacked.append(" " + Varicode::unpackGrid(extra));
} else if (nusergrid <= extra && extra < nmaxgrid) {
quint8 num = 0;
auto cmd = Varicode::unpackCmd(extra - nusergrid, &num);
auto cmdStr = directed_cmds.key(cmd);
unpacked.append(cmdStr);
if(Varicode::isSNRCommand(cmdStr)){
unpacked.append(Varicode::formatSNR(num - 31));
}
}
if(pType) *pType = type;
if(pBits3) *pBits3 = bits3;
return unpacked;
}
QString Varicode::packCompoundFrame(const QString &callsign, quint8 type, quint16 num, quint8 bits3){
QString frame;
// needs to be a compound type...
if(type == FrameDataCompressed || type == FrameDataUncompressed || type == FrameDirected){
return frame;
}
quint8 packed_flag = type;
quint64 packed_callsign = Varicode::packAlphaNumeric50(callsign);
if(packed_callsign == 0){
return frame;
}
quint16 mask11 = ((1<<11)-1)<<5;
quint8 mask5 = (1<<5)-1;
quint16 packed_11 = (num & mask11) >> 5;
quint8 packed_5 = num & mask5;
quint8 packed_8 = (packed_5 << 3) | bits3;
// [3][50][11],[5][3] = 72
auto bits = (
Varicode::intToBits(packed_flag, 3) +
Varicode::intToBits(packed_callsign, 50) +
Varicode::intToBits(packed_11, 11)
);
return Varicode::pack72bits(Varicode::bitsToInt(bits), packed_8);
}
QStringList Varicode::unpackCompoundFrame(const QString &text, quint8 *pType, quint16 *pNum, quint8 *pBits3){
QStringList unpacked;
if(text.length() < 12 || text.contains(" ")){
return unpacked;
}
// [3][50][11],[5][3] = 72
quint8 packed_8 = 0;
auto bits = Varicode::intToBits(Varicode::unpack72bits(text, &packed_8), 64);
quint8 packed_5 = packed_8 >> 3;
quint8 packed_3 = packed_8 & ((1<<3)-1);
quint8 packed_flag = Varicode::bitsToInt(bits.mid(0, 3));
// needs to be a ping type...
if(packed_flag == FrameDataCompressed || packed_flag == FrameDataUncompressed || packed_flag == FrameDirected){
return unpacked;
}
quint64 packed_callsign = Varicode::bitsToInt(bits.mid(3, 50));
quint16 packed_11 = Varicode::bitsToInt(bits.mid(53, 11));
QString callsign = Varicode::unpackAlphaNumeric50(packed_callsign);
quint16 num = (packed_11 << 5) | packed_5;
if(pType) *pType = packed_flag;
if(pNum) *pNum = num;
if(pBits3) *pBits3 = packed_3;
unpacked.append(callsign);
unpacked.append("");
return unpacked;
}
// J1Y ACK
// J1Y?
// KN4CRD: J1Y$
// KN4CRD: J1Y! HELLO WORLD
QString Varicode::packDirectedMessage(const QString &text, const QString &mycall, QString *pTo, bool *pToCompound, QString * pCmd, QString *pNum, int *n){
QString frame;
auto match = directed_re.match(text);
if(!match.hasMatch()){
if(n) *n = 0;
return frame;
}
QString from = mycall;
bool isFromCompound = Varicode::isCompoundCallsign(from);
if(isFromCompound){
from = "<....>";
}
QString to = match.captured("callsign");
QString cmd = match.captured("cmd");
QString num = match.captured("num");
// ensure we have a directed command
if(cmd.isEmpty()){
if(n) *n = 0;
return frame;
}
// ensure we have a valid callsign
bool isToCompound = false;
bool validToCallsign = (to != mycall) && Varicode::isValidCallsign(to, &isToCompound);
if(!validToCallsign){
qDebug() << "to" << to << "is not a valid callsign";
if(n) *n = 0;
return frame;
}
// return back the parsed "to" field
if(pTo) *pTo = to;
if(pToCompound) *pToCompound = isToCompound;
// then replace the current processing with a placeholder that we _can_ pack into a directed command,
// because later we'll send the "to" field in a compound frame using the results of this directed pack
if(isToCompound){
to = "<....>";
}
qDebug() << "directed" << validToCallsign << isToCompound << to;
// validate command
if(!Varicode::isCommandAllowed(cmd) && !Varicode::isCommandAllowed(cmd.trimmed())){
if(n) *n = 0;
return frame;
}
// packing general number...
bool numOK = false;
quint8 inum = Varicode::packNum(num.trimmed(), &numOK);
if(numOK){
if(pNum) *pNum = num;
}
quint32 packed_from = Varicode::packCallsign(from);
quint32 packed_to = Varicode::packCallsign(to);
if(packed_from == 0 || packed_to == 0){
if(n) *n = 0;
return frame;
}
QString cmdOut;
quint8 packed_cmd = 0;
if(directed_cmds.contains(cmd)){
cmdOut = cmd;
packed_cmd = directed_cmds[cmdOut];
}
if(directed_cmds.contains(cmd.trimmed())){
cmdOut = cmd.trimmed();
packed_cmd = directed_cmds[cmdOut];
}
quint8 packed_flag = FrameDirected;
quint8 packed_extra = inum;
// [3][28][28][5],[2][6] = 72
auto bits = (
Varicode::intToBits(packed_flag, 3) +
Varicode::intToBits(packed_from, 28) +
Varicode::intToBits(packed_to, 28) +
Varicode::intToBits(packed_cmd % 32, 5)
);
if(pCmd) *pCmd = cmdOut;
if(n) *n = match.captured(0).length();
return Varicode::pack72bits(Varicode::bitsToInt(bits), packed_extra % 64);
}
QStringList Varicode::unpackDirectedMessage(const QString &text, quint8 *pType){
QStringList unpacked;
if(text.length() < 12 || text.contains(" ")){
return unpacked;
}
// [3][28][22][11],[2][6] = 72
quint8 extra = 0;
auto bits = Varicode::intToBits(Varicode::unpack72bits(text, &extra), 64);
quint8 packed_flag = Varicode::bitsToInt(bits.mid(0, 3));
if(packed_flag != FrameDirected){
return unpacked;
}
quint32 packed_from = Varicode::bitsToInt(bits.mid(3, 28));
quint32 packed_to = Varicode::bitsToInt(bits.mid(31, 28));
quint8 packed_cmd = Varicode::bitsToInt(bits.mid(59, 5));
QString from = Varicode::unpackCallsign(packed_from).trimmed();
QString to = Varicode::unpackCallsign(packed_to).trimmed();
QString cmd = directed_cmds.key(packed_cmd % 32);
unpacked.append(from);
unpacked.append(to);
unpacked.append(cmd);
if(extra != 0){
if(Varicode::isSNRCommand(cmd)){
unpacked.append(Varicode::formatSNR((int)extra-31));
} else {
unpacked.append(QString("%1").arg(extra-31));
}
}
if(pType) *pType = packed_flag;
return unpacked;
}
QString packHuffMessage(const QString &input, int *n){
static const int frameSize = 72;
QString frame;
// [1][71] = 72
QVector<bool> frameBits = {false};
int i = 0;
// only pack huff messages that only contain valid chars
QString::const_iterator it;
QSet<QString> validChars = Varicode::huffValidChars(Varicode::defaultHuffTable());
for(it = input.constBegin(); it != input.constEnd(); it++){
auto ch = (*it).toUpper();
if(!validChars.contains(ch)){
if(n) *n = 0;
return frame;
}
}
// pack using the default huff table
foreach(auto pair, Varicode::huffEncode(Varicode::defaultHuffTable(), input)){
auto charN = pair.first;
auto charBits = pair.second;
if(frameBits.length() + charBits.length() < frameSize){
frameBits += charBits;
i += charN;
continue;
}
break;
}
qDebug() << "Huff bits" << frameBits.length() << "chars" << i;
int pad = frameSize - frameBits.length();
if(pad){
// the way we will pad is this...
// set the bit after the frame to 0 and every bit after that a 1
// to unpad, seek from the end of the bits until you hit a zero... the rest is the actual frame.
for(int i = 0; i < pad; i++){
frameBits.append(i == 0 ? (bool)0 : (bool)1);
}
}
quint64 value = Varicode::bitsToInt(frameBits.constBegin(), 64);
quint8 rem = (quint8)Varicode::bitsToInt(frameBits.constBegin() + 64, 8);
frame = Varicode::pack72bits(value, rem);
if(n) *n = i;
return frame;
}
QString packCompressedMessage(const QString &input, int *n){
static const int frameSize = 72;
QString frame;
// [1][71] = 72
QVector<bool> frameBits = {true};
int i = 0;
foreach(auto pair, JSC::compress(input)){
auto bits = pair.first;
auto chars = pair.second;
if(frameBits.length() + bits.length() < frameSize){
frameBits.append(bits);
i += chars;
continue;
}
break;
}
qDebug() << "Compressed bits" << frameBits.length() << "chars" << i;
int pad = frameSize - frameBits.length();
if(pad){
// the way we will pad is this...
// set the bit after the frame to 0 and every bit after that a 1
// to unpad, seek from the end of the bits until you hit a zero... the rest is the actual frame.
for(int i = 0; i < pad; i++){
frameBits.append(i == 0 ? (bool)0 : (bool)1);
}
}
quint64 value = Varicode::bitsToInt(frameBits.constBegin(), 64);
quint8 rem = (quint8)Varicode::bitsToInt(frameBits.constBegin() + 64, 8);
frame = Varicode::pack72bits(value, rem);
if(n) *n = i;
return frame;
}
QString Varicode::packDataMessage(const QString &input, int *n){
QString huffFrame;
int huffChars = 0;
huffFrame = packHuffMessage(input, &huffChars);
QString compressedFrame;
int compressedChars = 0;
compressedFrame = packCompressedMessage(input, &compressedChars);
if(huffChars > compressedChars){
if(n) *n = huffChars;
return huffFrame;
} else {
if(n) *n = compressedChars;
return compressedFrame;
}
}
QString Varicode::unpackDataMessage(const QString &text, quint8 *pType){
QString unpacked;
if(text.length() < 12 || text.contains(" ")){
return unpacked;
}
quint8 rem = 0;
quint64 value = Varicode::unpack72bits(text, &rem);
auto bits = Varicode::intToBits(value, 64) + Varicode::intToBits(rem, 8);
bool compressed = bits.at(0);
int n = bits.lastIndexOf(0);
bits = bits.mid(1, n-1);
if(compressed){
unpacked = JSC::decompress(bits);
if(pType) *pType = Varicode::FrameDataCompressed;
} else {
// huff decode the bits (without escapes)
unpacked = Varicode::huffDecode(Varicode::defaultHuffTable(), bits);
if(pType) *pType = Varicode::FrameDataUncompressed;
}
return unpacked;
}
// TODO: remove the dependence on providing all this data?
QList<QPair<QString, int>> Varicode::buildMessageFrames(
QString const& mycall,
//QString const& basecall,
QString const& mygrid,
//bool compound,
QString const& selectedCall,
QString const& text
){
#define ALLOW_SEND_COMPOUND 1
#define ALLOW_SEND_COMPOUND_DIRECTED 1
#define AUTO_PREPEND_DIRECTED 1
#define AUTO_REMOVE_MYCALL 1
bool mycallCompound = Varicode::isCompoundCallsign(mycall);
QList<QPair<QString, int>> frames;
foreach(QString line, text.split(QRegExp("[\\r\\n]"), QString::SkipEmptyParts)){
// once we find a directed call, data encode the rest of the line.
bool hasDirected = false;
// do the same for when we have sent data...
bool hasData = false;
#if AUTO_REMOVE_MYCALL
// remove our callsign from the start of the line...
if(line.startsWith(mycall + ":") || line.startsWith(mycall + " ")){
line = lstrip(line.mid(mycall.length() + 1));
}
// remove trailing whitespace as long as there are characters left afterwards
auto rline = rstrip(line);
if(!rline.isEmpty()){
line = rline;
}
#endif
#if AUTO_PREPEND_DIRECTED
// see if we need to prepend the directed call to the line...
// if we have a selected call and the text doesn't start with that call...
// and if this isn't a raw message (starting with "`")... then...
if(!selectedCall.isEmpty() && !line.startsWith(selectedCall) && !line.startsWith("`")){
bool lineStartsWithBaseCall = (
line.startsWith("@ALLCALL") ||
line.contains("HEARTBEAT") ||
Varicode::startsWithCQ(line)
);
#if AUTO_PREPEND_DIRECTED_ALLOW_TEXT_CALLSIGNS
auto calls = Varicode::parseCallsigns(line);
bool lineStartsWithStandardCall = !calls.isEmpty() && line.startsWith(calls.first()) && calls.first().length() > 2;
#else
bool lineStartsWithStandardCall = false;
#endif
if(lineStartsWithBaseCall || lineStartsWithStandardCall){
// pass
} else {
// if the message doesn't start with a base call
// and if there are no other callsigns in this message
// or if the first callsign in the message isn't at the beginning...
// then we should be auto-prefixing this line with the selected call
line = QString("%1 %2").arg(selectedCall).arg(line);
}
}
#endif
while(line.size() > 0){
QString frame;
bool useBcn = false;
#if ALLOW_SEND_COMPOUND
bool useCmp = false;
#endif
bool useDir = false;
bool useDat = false;
int l = 0;
QString bcnFrame = Varicode::packHeartbeatMessage(line, mycall, &l);
#if ALLOW_SEND_COMPOUND
int o = 0;
QString cmpFrame = Varicode::packCompoundMessage(line, &o);
#endif
int n = 0;
QString dirCmd;
QString dirTo;
QString dirNum;
bool dirToCompound = false;
QString dirFrame = Varicode::packDirectedMessage(line, mycall, &dirTo, &dirToCompound, &dirCmd, &dirNum, &n);
if(dirToCompound){
qDebug() << "directed message to field is compound" << dirTo;
}
int m = 0;
QString datFrame = Varicode::packDataMessage(line, &m);
// if this parses to a standard FT8 free text message
// but it can be parsed as a directed message, then we
// should send the directed version. if we've already sent
// a directed message or a data frame, we will only follow it
// with more data frames.
if(!hasDirected && !hasData && l > 0){
useBcn = true;
hasDirected = false;
frame = bcnFrame;
}
#if ALLOW_SEND_COMPOUND
else if(!hasDirected && !hasData && o > 0){
useCmp = true;
hasDirected = false;
frame = cmpFrame;
}
#endif
else if(!hasDirected && !hasData && n > 0){
useDir = true;
hasDirected = true;
frame = dirFrame;
}
else if (m > 0) {
useDat = true;
hasData = true;
frame = datFrame;
}
if(useBcn){
frames.append({ frame, Varicode::JS8Call });
line = line.mid(l);
}
#if ALLOW_SEND_COMPOUND
if(useCmp){
frames.append({ frame, Varicode::JS8Call });
line = line.mid(o);
}
#endif
if(useDir){
bool shouldUseStandardFrame = true;
#if ALLOW_SEND_COMPOUND_DIRECTED
/**
* We have a few special cases when we are sending to a compound call, or our call is a compound call, or both.
* CASE 0: Non-compound: KN4CRD: J1Y ACK
* -> One standard directed message frame
*
* CASE 1: Compound From: KN4CRD/P: J1Y ACK
* -> One standard compound frame, followed by a standard directed message frame with placeholder
* -> The second standard directed frame _could_ be replaced with a compound directed frame
* -> <KN4CRD/P EM73> then <....>: J1Y ACK
* -> <KN4CRD/P EM73> then <J1Y ACK>
*
* CASE 2: Compound To: KN4CRD: J1Y/P ACK
* -> One standard compound frame, followed by a compound directed frame
* -> <KN4CRD EM73> then <J1Y/P ACK>
*
* CASE 3: Compound From & To: KN4CRD/P: J1Y/P ACK
* -> One standard compound frame, followed by a compound directed frame
* -> <KN4CRD/P EM73> then <J1Y/P ACK>
**/
if(mycallCompound || dirToCompound){
qDebug() << "compound?" << mycallCompound << dirToCompound;
// Cases 1, 2, 3 all send a standard compound frame first...
QString deCompoundMessage = QString("`%1 %2").arg(mycall).arg(mygrid);
QString deCompoundFrame = Varicode::packCompoundMessage(deCompoundMessage, nullptr);
if(!deCompoundFrame.isEmpty()){
frames.append({ deCompoundFrame, Varicode::JS8Call });
}
// Followed, by a standard OR compound directed message...
QString dirCompoundMessage = QString("`%1%2%3").arg(dirTo).arg(dirCmd).arg(dirNum);
QString dirCompoundFrame = Varicode::packCompoundMessage(dirCompoundMessage, nullptr);
if(!dirCompoundFrame.isEmpty()){
frames.append({ dirCompoundFrame, Varicode::JS8Call });
}
shouldUseStandardFrame = false;
}
#endif
if(shouldUseStandardFrame) {
// otherwise, just send the standard directed frame
frames.append({ frame, Varicode::JS8Call });
}
line = line.mid(n);
// generate a checksum for buffered commands with line data
if(Varicode::isCommandBuffered(dirCmd) && !line.isEmpty()){
qDebug() << "generating checksum for line" << line << line.mid(1);
// strip leading whitespace after a buffered directed command
line = lstrip(line);
qDebug() << "before:" << line;
int checksumSize = Varicode::isCommandChecksumed(dirCmd);
if(checksumSize == 32){
line = line + " " + Varicode::checksum32(line);
} else if (checksumSize == 16) {
line = line + " " + Varicode::checksum16(line);
} else if (checksumSize == 0) {
// pass
qDebug() << "no checksum required for cmd" << dirCmd;
}
qDebug() << "after:" << line;
}
}
if(useDat){
frames.append({ frame, Varicode::JS8CallData });
line = line.mid(m);
}
}
}
if(!frames.isEmpty()){
frames.first().second |= Varicode::JS8CallFirst;
frames.last().second |= Varicode::JS8CallLast;
}
return frames;
}
BuildMessageFramesThread::BuildMessageFramesThread(
const QString &mycall,
//const QString &basecall,
const QString &mygrid,
//bool compound,
const QString &selectedCall,
const QString &text, QObject *parent):
QThread(parent),
m_mycall{mycall},
//m_basecall{basecall},
m_mygrid{mygrid},
//m_compound{compound},
m_selectedCall{selectedCall},
m_text{text}
{
}
void BuildMessageFramesThread::run(){
auto results = Varicode::buildMessageFrames(
m_mycall,
//m_basecall,
m_mygrid,
//m_compound,
m_selectedCall,
m_text
);
QList<QString> frames;
QList<int> bits;
foreach(auto pair, results){
frames.append(pair.first);
bits.append(pair.second);
}
emit resultReady(frames, bits);
}
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