blob: 8124a6ee6f346fe8c42e5d066c01b58cc5b42ff6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
// +build darwin ios
package keychain
/*
#cgo LDFLAGS: -framework CoreFoundation
#include <CoreFoundation/CoreFoundation.h>
*/
import "C"
import (
"math"
"time"
)
const nsPerSec = 1000 * 1000 * 1000
// absoluteTimeIntervalSince1970() returns the number of seconds from
// the Unix epoch (1970-01-01T00:00:00+00:00) to the Core Foundation
// absolute reference date (2001-01-01T00:00:00+00:00). It should be
// exactly 978307200.
func absoluteTimeIntervalSince1970() int64 {
return int64(C.kCFAbsoluteTimeIntervalSince1970)
}
func unixToAbsoluteTime(s int64, ns int64) C.CFAbsoluteTime {
// Subtract as int64s first before converting to floating
// point to minimize precision loss (assuming the given time
// isn't much earlier than the Core Foundation absolute
// reference date).
abs := s - absoluteTimeIntervalSince1970()
return C.CFAbsoluteTime(abs) + C.CFTimeInterval(ns)/nsPerSec
}
func absoluteTimeToUnix(abs C.CFAbsoluteTime) (int64, int64) {
int, frac := math.Modf(float64(abs))
return int64(int) + absoluteTimeIntervalSince1970(), int64(frac * nsPerSec)
}
// TimeToCFDate will convert the given time.Time to a CFDateRef, which
// must be released with Release(ref).
func TimeToCFDate(t time.Time) C.CFDateRef {
s := t.Unix()
ns := int64(t.Nanosecond())
abs := unixToAbsoluteTime(s, ns)
return C.CFDateCreate(C.kCFAllocatorDefault, abs)
}
// CFDateToTime will convert the given CFDateRef to a time.Time.
func CFDateToTime(d C.CFDateRef) time.Time {
abs := C.CFDateGetAbsoluteTime(d)
s, ns := absoluteTimeToUnix(abs)
return time.Unix(s, ns)
}
// Wrappers around C functions for testing.
func cfDateToAbsoluteTime(d C.CFDateRef) C.CFAbsoluteTime {
return C.CFDateGetAbsoluteTime(d)
}
func absoluteTimeToCFDate(abs C.CFAbsoluteTime) C.CFDateRef {
return C.CFDateCreate(C.kCFAllocatorDefault, abs)
}
func releaseCFDate(d C.CFDateRef) {
Release(C.CFTypeRef(d))
}
|
