janwas
1861448e6c
also rename wchar -> utf8 to avoid conflict with <wchar.h> (requires rebuild of workspace) (unfortunately copying history fails to "502 bad gateway"; had to delete old + add new independently) This was SVN commit r7340.
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/* Copyright (c) 2010 Wildfire Games
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* timestamp conversion: DOS FAT <-> Unix time_t
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*/
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#include "precompiled.h"
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#include "lib/fat_time.h"
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#include <ctime>
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#include "lib/bits.h"
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time_t time_t_from_FAT(u32 fat_timedate)
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{
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const u32 fat_time = bits(fat_timedate, 0, 15);
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const u32 fat_date = bits(fat_timedate, 16, 31);
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struct tm t; // struct tm format:
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t.tm_sec = bits(fat_time, 0,4) * 2; // [0,59]
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t.tm_min = bits(fat_time, 5,10); // [0,59]
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t.tm_hour = bits(fat_time, 11,15); // [0,23]
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t.tm_mday = bits(fat_date, 0,4); // [1,31]
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t.tm_mon = bits(fat_date, 5,8) - 1; // [0,11]
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t.tm_year = bits(fat_date, 9,15) + 80; // since 1900
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t.tm_isdst = -1; // unknown - let libc determine
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// otherwise: totally bogus, and at the limit of 32-bit time_t
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debug_assert(t.tm_year < 138);
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time_t ret = mktime(&t);
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debug_assert(ret != (time_t)-1); // mktime shouldn't fail
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return ret;
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}
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u32 FAT_from_time_t(time_t time)
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{
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// (values are adjusted for DST)
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struct tm* t = localtime(&time);
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const u16 fat_time = u16(
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(t->tm_sec/2) | // 5
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(u16(t->tm_min) << 5) | // 6
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(u16(t->tm_hour) << 11) // 5
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);
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const u16 fat_date = u16(
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(t->tm_mday) | // 5
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(u16(t->tm_mon+1) << 5) | // 4
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(u16(t->tm_year-80) << 9) // 7
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);
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u32 fat_timedate = u32_from_u16(fat_date, fat_time);
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return fat_timedate;
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}
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