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externals/tz/tz/tz.h

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+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
+// SPDX-FileCopyrightText: 1996 Arthur David Olson
+// SPDX-License-Identifier: BSD-2-Clause
+
+#pragma once
+
+#include <cstdint>
+#include <limits>
+#include <span>
+#include <algorithm>
+#include <array>
+
+namespace Tz
+{
+    using u8 = uint8_t;
+    using s8 = int8_t;
+    using u16 = uint16_t;
+    using s16 = int16_t;
+    using u32 = uint32_t;
+    using s32 = int32_t;
+    using u64 = uint64_t;
+    using s64 = int64_t;
+
+    constexpr size_t TZ_MAX_TIMES = 1000;
+    constexpr size_t TZ_MAX_TYPES = 128;
+    constexpr size_t TZ_MAX_CHARS = 50;
+    constexpr size_t MY_TZNAME_MAX = 255;
+    constexpr size_t TZNAME_MAXIMUM = 255;
+    constexpr size_t TZ_MAX_LEAPS = 50;
+    constexpr s64 TIME_T_MAX = std::numeric_limits<s64>::max();
+    constexpr s64 TIME_T_MIN = std::numeric_limits<s64>::min();
+    constexpr size_t CHARS_EXTRA = 3;
+    constexpr size_t MAX_ZONE_CHARS = std::max(TZ_MAX_CHARS + CHARS_EXTRA, sizeof("UTC"));
+    constexpr size_t MAX_TZNAME_CHARS = 2 * (MY_TZNAME_MAX + 1);
+
+    struct ttinfo
+    {
+        s32 tt_utoff;
+        bool tt_isdst;
+        s32 tt_desigidx;
+        bool tt_ttisstd;
+        bool tt_ttisut;
+    };
+    static_assert(sizeof(ttinfo) == 0x10, "ttinfo has the wrong size!");
+
+    struct Rule
+    {
+        s32 timecnt;
+        s32 typecnt;
+        s32 charcnt;
+        bool goback;
+        bool goahead;
+        std::array<u8, 0x2> padding0;
+        std::array<s64, TZ_MAX_TIMES> ats;
+        std::array<u8, TZ_MAX_TIMES> types;
+        std::array<ttinfo, TZ_MAX_TYPES> ttis;
+        std::array<char, std::max(MAX_ZONE_CHARS, MAX_TZNAME_CHARS)> chars;
+        s32 defaulttype;
+        std::array<u8, 0x12C4> padding1;
+    };
+    static_assert(sizeof(Rule) == 0x4000, "Rule has the wrong size!");
+
+    struct CalendarTimeInternal
+    {
+        s32 tm_sec;
+        s32 tm_min;
+        s32 tm_hour;
+        s32 tm_mday;
+        s32 tm_mon;
+        s32 tm_year;
+        s32 tm_wday;
+        s32 tm_yday;
+        s32 tm_isdst;
+        std::array<char, 16> tm_zone;
+        s32 tm_utoff;
+        s32 time_index;
+    };
+    static_assert(sizeof(CalendarTimeInternal) == 0x3C, "CalendarTimeInternal has the wrong size!");
+
+    s32 ParseTimeZoneBinary(Rule &out_rule, std::span<const u8> binary);
+
+    bool localtime_rz(CalendarTimeInternal *tmp, Rule const *sp, time_t *timep);
+    u32 mktime_tzname(time_t *out_time, Rule const *sp, CalendarTimeInternal *tmp);
+
+} // namespace Tz