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#include "module_ax25_decoder.h"
#include "logger.h"
#include "imgui/imgui.h"
#include "common/utils.h"
#include "common/codings/differential/nrzi.h"
#include "common/codings/lfsr.h"
#include "common/codings/deframing/hdlc_def.h"
namespace ax25
{
AX25DecoderModule::AX25DecoderModule(std::string input_file, std::string output_file_hint, nlohmann::json parameters) : ProcessingModule(input_file, output_file_hint, parameters)
{
input_buffer = new int8_t[256];
d_nrzi = parameters.contains("nrzi") ? parameters["nrzi"].get<bool>() : false;
d_g3ruh = parameters.contains("g3ruh") ? parameters["g3ruh"].get<bool>() : false;
}
AX25DecoderModule::~AX25DecoderModule()
{
delete[] input_buffer;
}
std::vector<ModuleDataType> AX25DecoderModule::getInputTypes()
{
return {DATA_FILE, DATA_STREAM};
}
std::vector<ModuleDataType> AX25DecoderModule::getOutputTypes()
{
return {DATA_FILE};
}
void AX25DecoderModule::process()
{
if (input_data_type == DATA_FILE)
filesize = getFilesize(d_input_file);
else
filesize = 0;
if (input_data_type == DATA_FILE)
data_in = std::ifstream(d_input_file, std::ios::binary);
data_out = std::ofstream(d_output_file_hint + ".frm", std::ios::binary);
d_output_files.push_back(d_output_file_hint + ".frm");
std::string directory = d_output_file_hint.substr(0, d_output_file_hint.rfind('/')) + "/";
logger->info("Using input frames " + d_input_file);
logger->info("Decoding to " + d_output_file_hint + ".frm");
diff::NRZIDiff nrzi_decoder;
common::lfsr g3rhu_descramble(0x21, 0x0, 16);
HDLCDeframer hdlc_deframer(d_parameters["min_sz"].get<int>(), d_parameters["max_sz"].get<int>());
uint8_t bits_buf[256];
time_t lastTime = 0;
while (input_data_type == DATA_FILE ? !data_in.eof() : input_active.load())
{
// Read buffer
if (input_data_type == DATA_FILE)
data_in.read((char *)input_buffer, 256);
else
input_fifo->read((uint8_t *)input_buffer, 256);
// Slice
for (int i = 0; i < 256; i++)
bits_buf[i] = input_buffer[i] > 0;
// Optional NRZ-I
if (d_nrzi)
nrzi_decoder.decode_bits(bits_buf, 256);
// Optional G3RUH
for (int i = 0; i < 256; i++)
bits_buf[i] = g3rhu_descramble.next_bit_descramble(bits_buf[i]);
// Deframe
auto frames = hdlc_deframer.work(bits_buf, 256);
for (auto frm : frames)
{
std::string source_callsign;
for (int i = 0; i < 6; i++)
source_callsign += frm[i] >> 1;
std::string destination_callsign;
for (int i = 7; i < 7 + 6; i++)
destination_callsign += frm[i] >> 1;
int source_ssid = frm[6] >> 1;
int target_ssid = frm[7 + 6] >> 1;
int ctrl = frm[14];
int pid = frm[15];
logger->trace("AX.25 Frame - SRC : " + source_callsign + ",%d DST : " + destination_callsign + ",%d CTRL : %d PID : %d",
source_ssid, target_ssid, ctrl, pid);
// Add a custom header to ease up forwarding to the next stuff
uint16_t pkt_sz = frm.size();
uint8_t buffer_sz[6];
buffer_sz[0] = 0x1a;
buffer_sz[1] = 0xcf;
buffer_sz[2] = 0xfc;
buffer_sz[3] = 0x1d;
buffer_sz[4] = pkt_sz >> 8;
buffer_sz[5] = pkt_sz & 0xFF;
frm.insert(frm.begin(), buffer_sz, buffer_sz + 6);
data_out.write((char *)frm.data(), frm.size());
frm_cnt++;
}
progress = data_in.tellg();
if (time(NULL) % 10 == 0 && lastTime != time(NULL))
{
lastTime = time(NULL);
logger->info("Progress " + std::to_string(round(((double)progress / (double)filesize) * 1000.0) / 10.0) + "%%, Frames " + std::to_string(frm_cnt));
}
}
logger->info("Decoding finished");
data_in.close();
}
void AX25DecoderModule::drawUI(bool window)
{
ImGui::Begin("AX-25 Decoder", NULL, window ? 0 : NOWINDOW_FLAGS);
ImGui::Button("Deframer", {200 * ui_scale, 20 * ui_scale});
{
ImGui::Text("Frames : ");
ImGui::SameLine();
ImGui::TextColored(style::theme.green, UITO_C_STR(frm_cnt));
}
if (!streamingInput)
ImGui::ProgressBar((double)progress / (double)filesize, ImVec2(ImGui::GetContentRegionAvail().x, 20 * ui_scale));
ImGui::End();
}
std::string AX25DecoderModule::getID()
{
return "ax25_decoder";
}
std::vector<std::string> AX25DecoderModule::getParameters()
{
return {};
}
std::shared_ptr<ProcessingModule> AX25DecoderModule::getInstance(std::string input_file, std::string output_file_hint, nlohmann::json parameters)
{
return std::make_shared<AX25DecoderModule>(input_file, output_file_hint, parameters);
}
} // namespace noaa
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