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sdrangel/ft8/unpack.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2023 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// This is the code from ft8mon: https://github.com/rtmrtmrtmrtm/ft8mon //
// reformatted and adapted to Qt and SDRangel context //
// //
// 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 <string>
#include "unpack.h"
#include "unpack0.h"
#include "util.h"
namespace FT8 {
int Packing::ihashcall(std::string rawcall, int m)
{
std::string call = trim(rawcall);
const char *chars = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ/";
while (call.size() < 11) {
call += " ";
}
unsigned long long x = 0;
for (int i = 0; i < 11; i++)
{
int c = call[i];
const char *p = strchr(chars, c);
if (p)
{
int j = p - chars;
x = 38 * x + j;
}
}
x = x * 47055833459LL;
x = x >> (64 - m);
return x;
}
//
// turn 28 bits of packed call into the call
//
std::string Packing::unpackcall(int x)
{
char tmp[64];
const char *c1 = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const char *c2 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const char *c3 = "0123456789";
const char *c4 = " ABCDEFGHIJKLMNOPQRSTUVWXYZ";
if (x == 0) {
return "DE";
}
if (x == 1) {
return "QRZ";
}
if (x == 2) {
return "CQ";
}
if (x <= 1002)
{
sprintf(tmp, "CQ %d", x - 3);
return std::string(tmp);
}
if (x <= 532443)
{
x -= 1003;
int ci1 = x / (27 * 27 * 27);
x %= 27 * 27 * 27;
int ci2 = x / (27 * 27);
x %= 27 * 27;
int ci3 = x / 27;
x %= 27;
int ci4 = x;
sprintf(tmp, "CQ %c%c%c%c", c4[ci1], c4[ci2], c4[ci3], c4[ci4]);
return std::string(tmp);
}
if (x < NTOKENS) {
return "<TOKEN>";
}
x -= NTOKENS;
if (x < MAX22)
{
// 22-bit hash...
std::string s;
hashes_mu.lock();
if (hashes22.count(x) > 0) {
s = hashes22[x];
} else {
s = "<...22>";
}
hashes_mu.unlock();
return s;
}
x -= MAX22;
char a[7];
a[5] = c4[x % 27];
x = x / 27;
a[4] = c4[x % 27];
x = x / 27;
a[3] = c4[x % 27];
x = x / 27;
a[2] = c3[x % 10];
x = x / 10;
a[1] = c2[x % 36];
x = x / 36;
a[0] = c1[x];
a[6] = '\0';
return std::string(a);
}
// unpack a 15-bit grid square &c.
// 77-bit version, from inspection of packjt77.f90.
// ir is the bit after the two 28+1-bit callee/caller.
std::string Packing::unpackgrid15(int ng, int ir)
{
if (ng < NGBASE)
{
// maidenhead grid system:
// latitude from south pole to north pole.
// longitude eastward from anti-meridian.
// first: 20 degrees longitude.
// second: 10 degrees latitude.
// third: 2 degrees longitude.
// fourth: 1 degree latitude.
// so there are 18*18*10*10 possibilities.
int x1 = ng / (18 * 10 * 10);
ng %= 18 * 10 * 10;
int x2 = ng / (10 * 10);
ng %= 10 * 10;
int x3 = ng / 10;
ng %= 10;
int x4 = ng;
char tmp[5];
tmp[0] = 'A' + x1;
tmp[1] = 'A' + x2;
tmp[2] = '0' + x3;
tmp[3] = '0' + x4;
tmp[4] = '\0';
return tmp;
}
ng -= NGBASE;
if (ng == 1) {
return " "; // ???
}
if (ng == 2) {
return "RRR ";
}
if (ng == 3) {
return "RR73";
}
if (ng == 4) {
return "73 ";
}
int db = ng - 35;
char tmp[16];
if (db >= 0) {
sprintf(tmp, "%s+%02d", ir ? "R" : "", db);
} else {
sprintf(tmp, "%s-%02d", ir ? "R" : "", 0 - db);
}
return std::string(tmp);
}
std::string Packing::unpackgrid25(int ng)
{
int x1 = ng / (18 * 10 * 10 * 25 * 25);
ng %= (18 * 10 * 10 * 25 * 25);
int x2 = ng / (10 * 10 * 25 * 25);
ng %= (10 * 10 * 25 * 25);
int x3 = ng / (10 * 25 * 25);
ng %= (10 * 25 * 25);
int x4 = ng / (25 * 25);
ng %= (25 * 25);
int x5 = ng / (25);
ng %= (25);
int x6 = ng;
char tmp[7];
tmp[0] = 'A' + x1;
tmp[1] = 'A' + x2;
tmp[2] = '0' + x3;
tmp[3] = '0' + x4;
tmp[4] = 'A' + x5;
tmp[5] = 'A' + x6;
tmp[6] = '\0';
return std::string(tmp);
}
void Packing::remember_call(std::string call)
{
hashes_mu.lock();
if (call.size() >= 3 && call[0] != '<')
{
hashes22[ihashcall(call, 22)] = call;
hashes12[ihashcall(call, 12)] = call;
hashes10[ihashcall(call, 10)] = call;
}
hashes_mu.unlock();
}
//
// i3 == 4
// a call that doesn't fit in 28 bits.
// 12 bits: hash of a previous call
// 58 bits: 11 characters
// 1 bit: swap
// 2 bits: 1 RRR, 2 RR73, 3 73
// 1 bit: 1 means CQ
std::string Packing::unpack_4(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
(void) locstr;
// 38 possible characters:
const char *chars = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ/";
long long n58 = un64(a77, 12, 58);
char call[16];
for (int i = 0; i < 11; i++)
{
call[10 - i] = chars[n58 % 38];
n58 = n58 / 38;
}
call[11] = '\0';
std::string callstr(call);
remember_call(callstr);
if (un64(a77, 73, 1) == 1)
{
call1str = std::string("CQ ") + callstr;
return call1str;
}
int x12 = un64(a77, 0, 12);
// 12-bit hash
hashes_mu.lock();
std::string ocall;
if (hashes12.count(x12) > 0) {
ocall = hashes12[x12];
} else {
ocall = "<...12>";
}
hashes_mu.unlock();
int swap = un64(a77, 70, 1);
std::string msg;
if (swap)
{
msg = call1str + " " + ocall;
call1str = trim(call);
call2str = trim(ocall);
}
else
{
msg = std::string(ocall) + " " + call;
call1str = trim(ocall);
call2str = trim(call);
}
int suffix = un64(a77, 71, 2);
if (suffix == 1)
{
locstr = " RRR";
} else if (suffix == 2) {
locstr = " RR73";
} else if (suffix == 3) {
locstr = " 73";
}
msg += locstr;
return msg;
}
//
// i3=1
//
std::string Packing::unpack_1(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
// type 1:
// 28 call1
// 1 P/R
// 28 call2
// 1 P/R
// 1 ???
// 15 grid
// 3 type
int i = 0;
int call1 = un64(a77, i, 28);
i += 28;
int rover1 = a77[i];
i += 1;
int call2 = un64(a77, i, 28);
i += 28;
int rover2 = a77[i];
i += 1;
int ir = a77[i];
i += 1;
int grid = un64(a77, i, 15);
i += 15;
int i3 = un64(a77, i, 3);
i += 3;
if (!((i3 == 1 || i3 == 2) && i == 77)) {
return std::string("");
}
call1str = trim(unpackcall(call1));
call2str = trim(unpackcall(call2));
locstr = unpackgrid15(grid, ir);
remember_call(call1str);
remember_call(call2str);
const std::string pr = (i3 == 1 ? "/R" : "/P");
return call1str + (rover1 ? pr : "") + " " + call2str + (rover2 ? pr : "") + " " + locstr;
}
std::string Packing::unpack_5(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
int x12 = un64(a77, 0, 12);
// 12-bit hash
hashes_mu.lock();
std::string ocall;
if (hashes12.count(x12) > 0) {
ocall = hashes12[x12];
} else {
ocall = "<...12>";
}
call1str = std::string(ocall);
int x22 = un64(a77, 12, 22);
if (hashes22.count(x22) > 0) {
ocall = hashes12[x22];
} else {
ocall = "<...22>";
}
hashes_mu.unlock();
call2str = std::string(ocall);
// mext bit is alway for R
int i = 12+ 22 +1;
// r3
int rst = un64(a77, i, 3);
rst = 52 + 10 * rst;
i += 3;
int qsonb = un64(a77, i, 11);
char report[16];
sprintf(report, "%d%04d", rst, qsonb);
i += 11;
// g25
int ng = un64(a77, i, 25);
locstr = unpackgrid25(ng);
std::string msg;
msg = call1str + " " + call2str + " " + std::string(report) + " " + locstr;
call1str += " " + std::string(report);
return msg;
}
// free text
// 71 bits, 13 characters, each one of 42 choices.
// reversed.
// details from wsjt-x's packjt77.f90
std::string Packing::unpack_0_0(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
// bit fields: f71
(void) call2str;
(void) locstr;
// the 42 possible characters.
const char *cc = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ+-./?";
boost::multiprecision::int128_t x = un128(a77, 0, 71);
std::string msg = "0123456789123";
for (int i = 0; i < 13; i++)
{
msg[13 - 1 - i] = cc[(int) (x % 42)];
x = x / 42;
}
call1str = msg;
return msg;
}
std::string Packing::unpack_0_1(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
// bit fields: c28 c28 h10 r5
int i = 0;
int call1 = un64(a77, i, 28); // c28
i += 28;
int call2 = un64(a77, i, 28); // c28
call1str = trim(unpackcall(call1)) + ";" + trim(unpackcall(call2));
i += 28;
int x10 = un64(a77, i, 10);
// 10-bit hash
hashes_mu.lock();
std::string ocall;
if (hashes10.count(x10) > 0)
{
call2str = hashes10[x10];
ocall = "<" + call2str + ">";
}
else
{
call2str = "<...10>";
ocall = call2str;
}
hashes_mu.unlock();
i += 10;
int i5 = un64(a77, i, 5); // decode r5
int r = 2*i5 - 30;
char tmp[32];
if (r >= 0) {
sprintf(tmp, "+%02d", r);
} else {
sprintf(tmp, "-%02d", -r);
}
locstr = std::string(tmp);
std::string msg;
msg = trim(unpackcall(call1)) + " RR73;" + trim(unpackcall(call2)) + " " + ocall;
return msg;
}
std::string Packing::unpack_0_5(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
(void) call2str;
(void) locstr;
const char *cc = "0123456789ABCDEF";
std::string msg = "123456789ABCDEF012";
// first digit is on 3 bits
int d0 = un64(a77, 0, 3);
msg[17] = cc[d0];
// 17 hexadecimal digits = 17*4 = 68 bits
boost::multiprecision::int128_t x = un128(a77, 3, 68);
for (int i = 0; i < 17; i++)
{
msg[17 - 1 - i] = cc[(int) (x % 4)];
x = x / 4;
}
call1str = msg;
return msg;
}
// ARRL RTTY Round-Up states/provinces
const char *Packing::ru_states[] = {
"AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA",
"HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD",
"MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ",
"NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC",
"SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY",
"NB", "NS", "QC", "ON", "MB", "SK", "AB", "BC", "NWT", "NF",
"LB", "NU", "YT", "PEI", "DC"};
// i3=3
// 3 TU; W9XYZ K1ABC R 579 MA 1 28 28 1 3 13 74 ARRL RTTY Roundup
// 1 TU
// 28 call1
// 28 call2
// 1 R
// 3 RST 529 to 599
// 13 state/province/serialnumber
std::string Packing::unpack_3(int a77[], std::string& call1str, std::string& call2str, std::string& locstr)
{
(void) locstr;
int i = 0;
int tu = a77[i];
i += 1;
int call1 = un64(a77, i, 28);
i += 28;
int call2 = un64(a77, i, 28);
i += 28;
int r = a77[i];
i += 1;
int rst = un64(a77, i, 3);
i += 3;
int serial = un64(a77, i, 13);
i += 13;
call1str = trim(unpackcall(call1));
call2str = trim(unpackcall(call2));
rst = 529 + 10 * rst;
int statei = serial - 8001;
std::string serialstr;
int nstates = sizeof(ru_states) / sizeof(ru_states[0]);
if (serial > 8000 && statei < nstates)
{
serialstr = ru_states[statei];
}
else
{
char tmp[32];
sprintf(tmp, "%04d", serial);
serialstr = std::string(tmp);
}
std::string msg;
if (tu) {
msg += "TU; ";
}
msg += call1str + " " + call2str + " ";
if (r)
{
msg += "R ";
}
{
char tmp[16];
sprintf(tmp, "%d ", rst);
msg += std::string(tmp);
}
msg += serialstr;
remember_call(call1str);
remember_call(call2str);
return msg;
}
// ARRL Field Day sections
const char *Packing::sections[] = {
"AB ", "AK ", "AL ", "AR ", "AZ ", "BC ", "CO ", "CT ", "DE ", "EB ",
"EMA", "ENY", "EPA", "EWA", "GA ", "GTA", "IA ", "ID ", "IL ", "IN ",
"KS ", "KY ", "LA ", "LAX", "MAR", "MB ", "MDC", "ME ", "MI ", "MN ",
"MO ", "MS ", "MT ", "NC ", "ND ", "NE ", "NFL", "NH ", "NL ", "NLI",
"NM ", "NNJ", "NNY", "NT ", "NTX", "NV ", "OH ", "OK ", "ONE", "ONN",
"ONS", "OR ", "ORG", "PAC", "PR ", "QC ", "RI ", "SB ", "SC ", "SCV",
"SD ", "SDG", "SF ", "SFL", "SJV", "SK ", "SNJ", "STX", "SV ", "TN ",
"UT ", "VA ", "VI ", "VT ", "WCF", "WI ", "WMA", "WNY", "WPA", "WTX",
"WV ", "WWA", "WY ", "DX "};
// i3 = 0, n3 = 3 or 4: ARRL Field Day
// 0.3 WA9XYZ KA1ABC R 16A EMA 28 28 1 4 3 7 71 ARRL Field Day
// 0.4 WA9XYZ KA1ABC R 32A EMA 28 28 1 4 3 7 71 ARRL Field Day
std::string Packing::unpack_0_3(int a77[], int n3, std::string& call1str, std::string& call2str, std::string& locstr)
{
(void) locstr;
int i = 0;
int call1 = un64(a77, i, 28);
i += 28;
int call2 = un64(a77, i, 28);
i += 28;
int R = un64(a77, i, 1);
i += 1;
int n_transmitters = un64(a77, i, 4);
if (n3 == 4) {
n_transmitters += 16;
}
i += 4;
int clss = un64(a77, i, 3); // class
i += 3;
int section = un64(a77, i, 7); // ARRL section
i += 7;
std::string msg;
call1str = trim(unpackcall(call1));
msg += call1str;
msg += " ";
call2str = trim(unpackcall(call2));
msg += call2str;
msg += " ";
if (R) {
msg += "R ";
}
{
char tmp[16];
sprintf(tmp, "%d%c ", n_transmitters + 1, clss + 'A');
msg += std::string(tmp);
}
if (section - 1 >= 0 && section - 1 < (int)(sizeof(sections) / sizeof(sections[0]))) {
msg += sections[section - 1];
}
return msg;
}
//
// unpack an FT8 message.
// a77 is 91 bits -- 77 plus the 14-bit CRC.
// CRC and LDPC have already been checked.
// details from wsjt-x's packjt77.f90 and 77bit.txt.
//
std::string Packing::unpack(int a77[], std::string& call1, std::string& call2, std::string& loc, std::string& type)
{
int i3 = un64(a77, 74, 3);
int n3 = un64(a77, 71, 3);
char tmp[64];
if (i3 == 0) {
sprintf(tmp, "%d.%d", i3, n3);
} else {
sprintf(tmp, "%d", i3);
}
type = std::string(tmp);
if (i3 == 0 && n3 == 0)
{
// free text
return unpack_0_0(a77, call1, call2, loc);
}
if (i3 == 0 && n3 == 1)
{
// DXpedition
return unpack_0_1(a77, call1, call2, loc);
}
if (i3 == 0 && (n3 == 3 || n3 == 4))
{
// ARRL Field Day
return unpack_0_3(a77, n3, call1, call2, loc);
}
if (i3 == 0 && n3 == 5)
{
// telemetry
return unpack_0_5(a77, call1, call2, loc);
}
if (i3 == 1 || i3 == 2)
{
// ordinary message or EU VHF
return unpack_1(a77, call1, call2, loc);
}
if (i3 == 3)
{
// RTTY Round-Up
return unpack_3(a77, call1, call2, loc);
}
if (i3 == 4)
{
// call that doesn't fit in 28 bits (non standard call)
return unpack_4(a77, call1, call2, loc);
}
if (i3 == 5)
{
// EU VHF with 6 digits locator
return unpack_5(a77, call1, call2, loc);
}
call1 = "UNK";
sprintf(tmp, "UNK i3=%d n3=%d", i3, n3);
return std::string(tmp);
}
} // namespace FT8
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