dvmhost/lookups/TalkgroupIdLookup.cpp

/**
* Digital Voice Modem - Host Software
* GPLv2 Open Source. Use is subject to license terms.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* @package DVM / Host Software
*
*/
//
// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
//
/*
*   Copyright (C) 2016 by Jonathan Naylor G4KLX
*   Copyright (C) 2017-2022 by Bryan Biedenkapp N2PLL
*
*   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 2 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, write to the Free Software
*   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "lookups/TalkgroupIdLookup.h"
#include "Log.h"
#include "Timer.h"

using namespace lookups;

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <string>
#include <vector>
#include <fstream>

// ---------------------------------------------------------------------------
//  Public Class Members
// ---------------------------------------------------------------------------

/// <summary>
/// Initializes a new instance of the TalkgroupIdLookup class.
/// </summary>
/// <param name="filename">Full-path to the talkgroup ID table file.</param>
/// <param name="reloadTime">Interval of time to reload the talkgroup ID table.</param>
/// <param name="tidAcl">Flag indicating whether talkgroup ID access control is enabled.</param>
TalkgroupIdLookup::TalkgroupIdLookup(const std::string& filename, uint32_t reloadTime, bool tidAcl) : LookupTable(filename, reloadTime),
    m_acl(tidAcl)
{
    /* stub */
}

/// <summary>
/// Finalizes a instance of the TalkgroupIdLookup class.
/// </summary>
TalkgroupIdLookup::~TalkgroupIdLookup()
{
    /* stub */
}

/// <summary>
/// Adds a new entry to the lookup table by the specified unique ID.
/// </summary>
/// <param name="id">Unique ID to add.</param>
/// <param name="slot">DMR slot this talkgroup is valid on.</param>
/// <param name="enabled">Flag indicating if talkgroup ID is enabled or not.</param>
void TalkgroupIdLookup::addEntry(uint32_t id, unsigned char slot, bool enabled)
{
    TalkgroupId entry = TalkgroupId(enabled, slot, false);

    m_mutex.lock();
    {
        try {
            TalkgroupId _entry = m_table.at(id);

            // if the enabled value doesn't match -- override with the intended
            if (_entry.tgEnabled() != enabled) {
                _entry = TalkgroupId(enabled, _entry.tgSlot(), false);
                m_table[id] = _entry;
            }
        } catch (...) {
            m_table[id] = entry;
        }
    }
    m_mutex.unlock();
}

/// <summary>
/// Finds a table entry in this lookup table.
/// </summary>
/// <param name="id">Unique identifier for table entry.</param>
/// <returns>Table entry.</returns>
TalkgroupId TalkgroupIdLookup::find(uint32_t id)
{
    TalkgroupId entry;

    m_mutex.lock();
    {
        try {
            entry = m_table.at(id);
        } catch (...) {
            entry = TalkgroupId(false, 0U, true);
        }
    }
    m_mutex.unlock();

    return entry;
}

/// <summary>
/// Flag indicating whether talkgroup ID access control is enabled or not.
/// </summary>
/// <returns>True, if talkgroup ID access control is enabled, otherwise false.</returns>
bool TalkgroupIdLookup::getACL()
{
    return m_acl;
}

// ---------------------------------------------------------------------------
//  Private Class Members
// ---------------------------------------------------------------------------

/// <summary>
/// Loads the table from the passed lookup table file.
/// </summary>
/// <returns>True, if lookup table was loaded, otherwise false.</returns>
bool TalkgroupIdLookup::load()
{
    if (m_filename.length() <= 0) {
        return false;
    }

    std::ifstream file (m_filename, std::ifstream::in);
    if (file.fail()) {
        LogError(LOG_HOST, "Cannot open the lookup file - %s", m_filename.c_str());
        return false;
    }

    // clear table
    clear();

    m_mutex.lock();
    {
        // read lines from file
        std::string line;
        while (std::getline(file, line)) {
            if (line.length() > 0) {
                if (line.at(0) == '#')
                    continue;

                // tokenize line
                std::string next;
                std::vector<std::string> parsed;
                char delim = ',';

                for (char c : line) {
                    if (c == delim) {
                        if (!next.empty()) {
                            parsed.push_back(next);
                            next.clear();
                        }
                    }
                    else
                        next += c;
                }
                if (!next.empty())
                    parsed.push_back(next);

                // parse tokenized line
                uint32_t id = ::atoi(parsed[0].c_str());
                bool tgEnabled = ::atoi(parsed[1].c_str()) == 1;
                uint8_t tgSlot = (uint8_t)::atoi(parsed[2].c_str());
                bool tgDefault = false;

                m_table[id] = TalkgroupId(tgEnabled, tgSlot, tgDefault);
            }
        }
    }
    m_mutex.unlock();

    file.close();

    size_t size = m_table.size();
    if (size == 0U)
        return false;

    LogInfoEx(LOG_HOST, "Loaded %u entries into lookup table", size);

    return true;
}