Cyprian Klimaszewski
66 lines
2.6 KiB
C++
66 lines
2.6 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD 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, version 2.
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* OpenTTD 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.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
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*/
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/** @file history.cpp Implementation of functions for storing historical data. */
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#include "../stdafx.h"
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#include "../core/bitmath_func.hpp"
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#include "history_type.hpp"
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#include "history_func.hpp"
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#include "../safeguards.h"
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/**
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* Update mask of valid records for a historical data.
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* @note Call only for the largest history range sub-division.
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* @param[in,out] valid_history Valid history records.
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* @param hr History range to update mask for.
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* @param cur_month Current economy month.
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*/
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void UpdateValidHistory(ValidHistoryMask &valid_history, const HistoryRange &hr, uint cur_month)
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{
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/* Update for subdivisions first. */
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if (hr.hr != nullptr) UpdateValidHistory(valid_history, *hr.hr, cur_month);
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/* No need to update if our last entry is marked valid. */
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if (HasBit(valid_history, hr.last - 1)) return;
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/* Is it the right time for this history range? */
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if (cur_month % hr.total_division != 0) return;
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/* Is the previous history range valid yet? */
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if (hr.division != 1 && !HasBit(valid_history, hr.first - hr.division)) return;
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SB(valid_history, hr.first, hr.records, GB(valid_history, hr.first, hr.records) << 1ULL | 1ULL);
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}
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/**
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* Test if history data is valid, without extracting data.
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* @param valid_history Mask of valid history records.
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* @param hr History range to test.
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* @param age Age of data to test.
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* @return True iff the data for history range and age is valid.
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*/
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bool IsValidHistory(ValidHistoryMask valid_history, const HistoryRange &hr, uint age)
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{
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if (hr.hr == nullptr) {
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if (age < hr.periods) {
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uint slot = hr.first + age;
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return HasBit(valid_history, slot);
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}
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} else {
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if (age * hr.division < static_cast<uint>(hr.hr->periods - hr.division)) {
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uint start = age * hr.division + ((TimerGameEconomy::month / hr.hr->division) % hr.division);
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return IsValidHistory(valid_history, *hr.hr, start);
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}
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if (age < hr.periods) {
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uint slot = hr.first + age - ((hr.hr->periods / hr.division) - 1);
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return HasBit(valid_history, slot);
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}
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}
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return false;
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}
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