1/*
2   Copyright The containerd Authors.
3
4   Licensed under the Apache License, Version 2.0 (the "License");
5   you may not use this file except in compliance with the License.
6   You may obtain a copy of the License at
7
8       http://www.apache.org/licenses/LICENSE-2.0
9
10   Unless required by applicable law or agreed to in writing, software
11   distributed under the License is distributed on an "AS IS" BASIS,
12   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   See the License for the specific language governing permissions and
14   limitations under the License.
15*/
16
17package archive
18
19import (
20	"syscall"
21	"time"
22	"unsafe"
23)
24
25var (
26	minTime = time.Unix(0, 0)
27	maxTime time.Time
28)
29
30func init() {
31	if unsafe.Sizeof(syscall.Timespec{}.Nsec) == 8 {
32		// This is a 64 bit timespec
33		// os.Chtimes limits time to the following
34		maxTime = time.Unix(0, 1<<63-1)
35	} else {
36		// This is a 32 bit timespec
37		maxTime = time.Unix(1<<31-1, 0)
38	}
39}
40
41func boundTime(t time.Time) time.Time {
42	if t.Before(minTime) || t.After(maxTime) {
43		return minTime
44	}
45
46	return t
47}
48
49func latestTime(t1, t2 time.Time) time.Time {
50	if t1.Before(t2) {
51		return t2
52	}
53	return t1
54}
55