1. 1
2. 2
3. 3
4. 4
5. 5
6. 6
7. 7
8. 8
9. 9
10. 10
11. 11
12. 12
13. 13
14. 14
15. 15
16. 16
17. 17
18. 18
19. 19
20. 20
21. 21
22. 22
23. 23
24. 24
25. 25
26. 26
27. 27
28. 28
29. 29
30. 30
31. 31
32. 32
33. 33
34. 34
35. 35
36. 36
37. 37
38. 38
39. 39
40. 40
41. 41
42. 42
43. 43
44. 44
45. 45
46. 46
47. 47
48. 48
49. 49
50. 50
51. 51
52. 52
53. 53
54. 54
55. 55
56. 56
57. 57
58. 58
59. 59
60. 60
61. 61
62. 62
63. 63
64. 64
65. 65
66. 66
67. 67
68. 68
69. 69
70. 70
71. 71
72. 72
73. 73

// +build windows

package winio

import (
	"os"
	"runtime"
	"unsafe"

	"golang.org/x/sys/windows"
)

// FileBasicInfo contains file access time and file attributes information.
type FileBasicInfo struct {
	CreationTime, LastAccessTime, LastWriteTime, ChangeTime windows.Filetime
	FileAttributes                                          uint32
	pad                                                     uint32 // padding
}

// GetFileBasicInfo retrieves times and attributes for a file.
func GetFileBasicInfo(f *os.File) (*FileBasicInfo, error) {
	bi := &FileBasicInfo{}
	if err := windows.GetFileInformationByHandleEx(windows.Handle(f.Fd()), windows.FileBasicInfo, (*byte)(unsafe.Pointer(bi)), uint32(unsafe.Sizeof(*bi))); err != nil {
		return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
	}
	runtime.KeepAlive(f)
	return bi, nil
}

// SetFileBasicInfo sets times and attributes for a file.
func SetFileBasicInfo(f *os.File, bi *FileBasicInfo) error {
	if err := windows.SetFileInformationByHandle(windows.Handle(f.Fd()), windows.FileBasicInfo, (*byte)(unsafe.Pointer(bi)), uint32(unsafe.Sizeof(*bi))); err != nil {
		return &os.PathError{Op: "SetFileInformationByHandle", Path: f.Name(), Err: err}
	}
	runtime.KeepAlive(f)
	return nil
}

// FileStandardInfo contains extended information for the file.
// FILE_STANDARD_INFO in WinBase.h
// https://docs.microsoft.com/en-us/windows/win32/api/winbase/ns-winbase-file_standard_info
type FileStandardInfo struct {
	AllocationSize, EndOfFile int64
	NumberOfLinks             uint32
	DeletePending, Directory  bool
}

// GetFileStandardInfo retrieves ended information for the file.
func GetFileStandardInfo(f *os.File) (*FileStandardInfo, error) {
	si := &FileStandardInfo{}
	if err := windows.GetFileInformationByHandleEx(windows.Handle(f.Fd()), windows.FileStandardInfo, (*byte)(unsafe.Pointer(si)), uint32(unsafe.Sizeof(*si))); err != nil {
		return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
	}
	runtime.KeepAlive(f)
	return si, nil
}

// FileIDInfo contains the volume serial number and file ID for a file. This pair should be
// unique on a system.
type FileIDInfo struct {
	VolumeSerialNumber uint64
	FileID             [16]byte
}

// GetFileID retrieves the unique (volume, file ID) pair for a file.
func GetFileID(f *os.File) (*FileIDInfo, error) {
	fileID := &FileIDInfo{}
	if err := windows.GetFileInformationByHandleEx(windows.Handle(f.Fd()), windows.FileIdInfo, (*byte)(unsafe.Pointer(fileID)), uint32(unsafe.Sizeof(*fileID))); err != nil {
		return nil, &os.PathError{Op: "GetFileInformationByHandleEx", Path: f.Name(), Err: err}
	}
	runtime.KeepAlive(f)
	return fileID, nil
}