48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
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#include "h/ref.hxx"
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#include "time.hxx"
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#include "h/ole.hxx"
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#include <limits.h>
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#include <assert.h>
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// Number of seconds difference betwen FILETIME (since 1601 00:00:00)
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// and time_t (since 1970 00:00:00)
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//
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// This should be a constant difference between the 2 time formats
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//
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#ifdef __GNUC__ // cater to differences of compiler syntax
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const LONGLONG ci64DiffFTtoTT=11644473600LL;
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#else // __GNUC__
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const LONGLONG ci64DiffFTtoTT=11644473600;
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#endif // __GNUC__
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STDAPI_(void) FileTimeToTimeT(const FILETIME *pft, time_t *ptt)
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{
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ULONGLONG llFT = pft->dwHighDateTime;
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llFT = (llFT << 32) | (pft->dwLowDateTime);
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// convert to seconds
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// (note that all fractions of seconds will be lost)
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llFT = llFT/10000000;
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llFT -= ci64DiffFTtoTT; // convert to time_t
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assert(llFT <= ULONG_MAX);
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*ptt = (time_t) llFT;
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}
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STDAPI_(void) TimeTToFileTime(const time_t *ptt, FILETIME *pft)
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{
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ULONGLONG llFT = *ptt;
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llFT += ci64DiffFTtoTT; // convert to file time
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// convert to nano-seconds
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for (int i=0; i<7; i++) // mulitply by 10 7 times
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{
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llFT = llFT << 1; // llFT = 2x
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llFT += (llFT << 2); // llFT = 4*2x + 2x = 10x
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}
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pft->dwLowDateTime = (DWORD) (llFT & 0xffffffff);
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pft->dwHighDateTime = (DWORD) (llFT >> 32);
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}
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#ifdef _MSC_VER
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#pragma warning(disable:4514)
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// disable warning about unreferenced inline functions
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#endif
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