Add archive package

Archive package handles generating and applying diff tar streams
based on the OCI diff tar specification.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

archive/time_windows.go

@@ -0,0 +1,25 @@
+package archive
+
+import (
+	"syscall"
+	"time"
+)
+
+// chtimes will set the create time on a file using the given modtime.
+// This requires calling SetFileTime and explicitly including the create time.
+func chtimes(path string, atime, mtime time.Time) error {
+	ctimespec := syscall.NsecToTimespec(mtime.UnixNano())
+	pathp, e := syscall.UTF16PtrFromString(path)
+	if e != nil {
+		return e
+	}
+	h, e := syscall.CreateFile(pathp,
+		syscall.FILE_WRITE_ATTRIBUTES, syscall.FILE_SHARE_WRITE, nil,
+		syscall.OPEN_EXISTING, syscall.FILE_FLAG_BACKUP_SEMANTICS, 0)
+	if e != nil {
+		return e
+	}
+	defer syscall.Close(h)
+	c := syscall.NsecToFiletime(syscall.TimespecToNsec(ctimespec))
+	return syscall.SetFileTime(h, &c, nil, nil)
+}