From 3f0580f2546de8be7acf1bc78a55a257bc638ebe Mon Sep 17 00:00:00 2001 From: Bartosz Brachaczek Date: Tue, 12 Nov 2019 14:31:08 +0100 Subject: [PATCH] Make HgfsConvertFromNtTimeNsec aware of 64-bit time_t on i386 I verified that this function behaves as expected on x86_64, i386 with 32-bit time_t, and i386 with 64-bit time_t for the following values of ntTtime: UNIX_EPOCH-1, UNIX_EPOCH, UNIX_EPOCH+1, UNIX_S32_MAX-1, UNIX_S32_MAX, UNIX_S32_MAX+1, UNIX_S32_MAX*2+1 I did not verify whether the use of Div643264 is optimal, performance wise. Signed-off-by: Giulio Benetti --- lib/hgfs/hgfsUtil.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/lib/hgfs/hgfsUtil.c b/lib/hgfs/hgfsUtil.c index cc580ab8..49b10040 100644 --- a/lib/hgfs/hgfsUtil.c +++ b/lib/hgfs/hgfsUtil.c @@ -110,23 +110,21 @@ HgfsConvertFromNtTimeNsec(struct timespec *unixTime, // OUT: Time in UNIX format uint64 ntTime) // IN: Time in Windows NT format { #ifdef __i386__ - uint32 sec; - uint32 nsec; + uint64 sec64; + uint32 sec32, nsec; +#endif ASSERT(unixTime); - /* We assume that time_t is 32bit */ - ASSERT_ON_COMPILE(sizeof (unixTime->tv_sec) == 4); - /* Cap NT time values that are outside of Unix time's range */ + if (sizeof (unixTime->tv_sec) == 4) { + /* Cap NT time values that are outside of Unix time's range */ - if (ntTime >= UNIX_S32_MAX) { - unixTime->tv_sec = 0x7FFFFFFF; - unixTime->tv_nsec = 0; - return 1; + if (ntTime >= UNIX_S32_MAX) { + unixTime->tv_sec = 0x7FFFFFFF; + unixTime->tv_nsec = 0; + return 1; + } } -#else - ASSERT(unixTime); -#endif if (ntTime < UNIX_EPOCH) { unixTime->tv_sec = 0; @@ -135,9 +133,15 @@ HgfsConvertFromNtTimeNsec(struct timespec *unixTime, // OUT: Time in UNIX format } #ifdef __i386__ - Div643232(ntTime - UNIX_EPOCH, 10000000, &sec, &nsec); - unixTime->tv_sec = sec; - unixTime->tv_nsec = nsec * 100; + if (sizeof (unixTime->tv_sec) == 4) { + Div643232(ntTime - UNIX_EPOCH, 10000000, &sec32, &nsec); + unixTime->tv_sec = sec32; + unixTime->tv_nsec = nsec * 100; + } else { + Div643264(ntTime - UNIX_EPOCH, 10000000, &sec64, &nsec); + unixTime->tv_sec = sec64; + unixTime->tv_nsec = nsec * 100; + } #else unixTime->tv_sec = (ntTime - UNIX_EPOCH) / 10000000; unixTime->tv_nsec = ((ntTime - UNIX_EPOCH) % 10000000) * 100; -- 2.25.1