49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include "UUID.hpp"
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#include <ctime>
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namespace OpenVulkano
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{
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UUID GenerateTimePrefixedCustomUUID()
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{
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UUID uuid = UUID::generate();
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uuid.time_low = 0;
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uuid.time_mid = 0;
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time_t now = time(nullptr);
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struct tm* timeinfo = localtime(&now);
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// Extract time components
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uint32_t year = timeinfo->tm_year % 100; // Get last two digits of year
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uint32_t month = timeinfo->tm_mon + 1; // Month is 0-based
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uint32_t day = timeinfo->tm_mday;
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uint32_t hour = timeinfo->tm_hour;
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uint16_t minute = timeinfo->tm_min;
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uint16_t second = timeinfo->tm_sec;
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// Each decimal digit takes 4 bits in the final hex number
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uuid.time_low |= (year / 10) << 28;
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uuid.time_low |= (year % 10) << 24;
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uuid.time_low |= (month / 10) << 20;
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uuid.time_low |= (month % 10) << 16;
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uuid.time_low |= (day / 10) << 12;
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uuid.time_low |= (day % 10) << 8;
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uuid.time_low |= (hour / 10) << 4;
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uuid.time_low |= (hour % 10) << 0;
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uuid.time_mid |= (minute / 10) << 12;
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uuid.time_mid |= (minute % 10) << 8;
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uuid.time_mid |= (second / 10) << 4;
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uuid.time_mid |= (second % 10) << 0;
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// Set version to custom
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uuid.time_hiv &= ~(static_cast<uint16_t>(uuid.version()) << 12);
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uuid.time_hiv |= 8 << 12;
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return uuid;
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}
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} |