mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-12-15 02:34:33 -05:00
96 lines
3.7 KiB
C++
96 lines
3.7 KiB
C++
/*
|
|
* Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
|
|
* Copyright (C) 2016 Furrtek
|
|
* Copyright (C) 2022 Arjan Onwezen
|
|
*
|
|
* This file is part of PortaPack.
|
|
*
|
|
* 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, 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; see the file COPYING. If not, write to
|
|
* the Free Software Foundation, Inc., 51 Franklin Street,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "database.hpp"
|
|
#include "file.hpp"
|
|
#include "file_path.hpp"
|
|
#include <cstring>
|
|
|
|
int database::retrieve_mid_record(MidDBRecord* record, std::string search_term) {
|
|
file_path = ais_dir / u"mids.db";
|
|
index_item_length = 4;
|
|
record_length = 32;
|
|
|
|
result = retrieve_record(file_path, index_item_length, record_length, record, search_term);
|
|
|
|
return (result);
|
|
}
|
|
|
|
int database::retrieve_airline_record(AirlinesDBRecord* record, std::string search_term) {
|
|
file_path = adsb_dir / u"airlines.db";
|
|
index_item_length = 4;
|
|
record_length = 64;
|
|
|
|
result = retrieve_record(file_path, index_item_length, record_length, record, search_term);
|
|
|
|
return (result);
|
|
}
|
|
|
|
int database::retrieve_aircraft_record(AircraftDBRecord* record, std::string search_term) {
|
|
file_path = adsb_dir / u"icao24.db";
|
|
index_item_length = 7;
|
|
record_length = 146;
|
|
|
|
result = retrieve_record(file_path, index_item_length, record_length, record, search_term);
|
|
|
|
return (result);
|
|
}
|
|
|
|
int database::retrieve_record(std::filesystem::path file_path, int index_item_length, int record_length, void* record, std::string search_term) {
|
|
if (search_term.empty())
|
|
return DATABASE_RECORD_NOT_FOUND;
|
|
|
|
auto result = db_file.open(file_path);
|
|
if (!result.is_valid()) {
|
|
number_of_records = (db_file.size() / (index_item_length + record_length)); // determine number of records in file
|
|
// binary search tree
|
|
int first = 0, // First search element
|
|
last = number_of_records - 1, // Last search element
|
|
middle, // Mid point of search
|
|
position = -1; // Position of search value
|
|
|
|
while (!found && first <= last) {
|
|
middle = (first + last) / 2; // Calculate mid point
|
|
db_file.seek(middle * index_item_length);
|
|
db_file.read(file_buffer, search_term.length());
|
|
if (file_buffer == search_term) { // If value is found at mid
|
|
found = true;
|
|
position = middle;
|
|
} else if (file_buffer > search_term) // If value is in lower half
|
|
last = middle - 1;
|
|
else
|
|
first = middle + 1; // If value is in upper half
|
|
}
|
|
|
|
if (found == true) {
|
|
db_file.seek((number_of_records * index_item_length) + (position * record_length)); // seek starting after index
|
|
db_file.read(record, record_length);
|
|
return (DATABASE_RECORD_FOUND);
|
|
} else {
|
|
return (DATABASE_RECORD_NOT_FOUND);
|
|
}
|
|
|
|
} else
|
|
return (DATABASE_NOT_FOUND);
|
|
}
|