utils: fix a Y2038 bug by replacing Int32x32To64 with multiplication

CookiePLMonster · CookiePLMonster · commit e0b22e94f041 · 2025-01-06T19:41:27.000+01:00
Int32x32To64 macro internally truncates the arguments to int32,
while time_t is 64-bit on most/all modern platforms.
Therefore, usage of this macro creates a Year 2038 bug.

Signed-off-by: Adrian Zdanowicz &lt;zdanio95@gmail.com&gt;
diff --git a/src/dokan/utils.cc b/src/dokan/utils.cc
@@ -15,7 +15,7 @@
 void to_filetime(time_t t, LPFILETIME pft)
 {
   // Note that LONGLONG is a 64-bit value
-  LONGLONG ll = Int32x32To64(t, 10000000) + 116444736000000000;
+  LONGLONG ll = (t * 10000000LL) + 116444736000000000LL;
   pft->dwLowDateTime = (DWORD)ll;
   pft->dwHighDateTime = ll >> 32;
 }

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,7 @@`
`15`	`15`	`void to_filetime(time_t t, LPFILETIME pft)`
`16`	`16`	`{`
`17`	`17`	`// Note that LONGLONG is a 64-bit value`
`18`		`- LONGLONG ll = Int32x32To64(t, 10000000) + 116444736000000000;`
	`18`	`+ LONGLONG ll = (t * 10000000LL) + 116444736000000000LL;`
`19`	`19`	`pft->dwLowDateTime = (DWORD)ll;`
`20`	`20`	`pft->dwHighDateTime = ll >> 32;`
`21`	`21`	`}`