69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Part of libhgfs - (c) 2009, D.C. van Moolenbroek */
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#include "inc.h"
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static u64_t time_offset;
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/*===========================================================================*
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* time_init *
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*===========================================================================*/
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void time_init(void)
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{
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/* Initialize the time conversion module.
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*/
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/* Generate a 64-bit value for the offset to use in time conversion. The
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* HGFS time format uses Windows' FILETIME standard, expressing time in
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* 100ns-units since Jan 1, 1601 UTC. The value that is generated is
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* the difference between that time and the UNIX epoch, in 100ns units.
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*/
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/* FIXME: we currently do not take into account timezones. */
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time_offset = mul64u(116444736, 1000000000);
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}
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/*===========================================================================*
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* time_put *
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*===========================================================================*/
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void time_put(struct timespec *tsp)
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{
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/* Store a POSIX timestamp pointed to by the given pointer onto the RPC buffer,
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* in HGFS timestamp format. If a NULL pointer is given, store a timestamp of
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* zero instead.
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*/
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u64_t hgfstime;
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if (tsp != NULL) {
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hgfstime = mul64u(tsp->tv_sec, 10000000) + (tsp->tv_nsec / 100);
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hgfstime += time_offset;
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RPC_NEXT32 = ex64lo(hgfstime);
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RPC_NEXT32 = ex64hi(hgfstime);
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} else {
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RPC_NEXT32 = 0;
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RPC_NEXT32 = 0;
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}
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}
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/*===========================================================================*
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* time_get *
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*===========================================================================*/
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void time_get(struct timespec *tsp)
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{
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/* Get a HGFS timestamp from the RPC buffer, convert it into a POSIX timestamp,
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* and store the result in the given time pointer. If the given pointer is
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* NULL, however, simply skip over the timestamp in the RPC buffer.
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*/
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u64_t hgfstime;
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u32_t time_lo, time_hi;
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if (tsp != NULL) {
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time_lo = RPC_NEXT32;
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time_hi = RPC_NEXT32;
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hgfstime = sub64(make64(time_lo, time_hi), time_offset);
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tsp->tv_sec = div64u(hgfstime, 10000000);
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tsp->tv_nsec = rem64u(hgfstime, 10000000) * 100;
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}
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else RPC_ADVANCE(sizeof(u32_t) * 2);
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}
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