-
Notifications
You must be signed in to change notification settings - Fork 0
/
syscall.go
143 lines (115 loc) · 3.12 KB
/
syscall.go
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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
//go:build windows
package webviewloader
import (
"fmt"
"syscall"
"unicode/utf16"
"unsafe"
"golang.org/x/sys/windows"
)
var (
modkernel32 = windows.NewLazySystemDLL("kernel32.dll")
procGlobalAlloc = modkernel32.NewProc("GlobalAlloc")
procGlobalFree = modkernel32.NewProc("GlobalFree")
modversion = windows.NewLazySystemDLL("version.dll")
procGetFileVersionInfoSize = modversion.NewProc("GetFileVersionInfoSizeW")
procGetFileVersionInfo = modversion.NewProc("GetFileVersionInfoW")
procVerQueryValue = modversion.NewProc("VerQueryValueW")
modole32 = windows.NewLazySystemDLL("ole32.dll")
procCoTaskMemAlloc = modole32.NewProc("CoTaskMemAlloc")
)
func getFileVersionInfo(path string) ([]byte, error) {
lptstrFilename, err := syscall.UTF16PtrFromString(path)
if err != nil {
return nil, err
}
size, _, err := procGetFileVersionInfoSize.Call(
uintptr(unsafe.Pointer(lptstrFilename)),
0,
)
err = maskErrorSuccess(err)
if size == 0 && err == nil {
err = fmt.Errorf("GetFileVersionInfoSize failed")
}
if err != nil {
return nil, err
}
data := make([]byte, size)
ret, _, err := procGetFileVersionInfo.Call(
uintptr(unsafe.Pointer(lptstrFilename)),
0,
uintptr(size),
uintptr(unsafe.Pointer(&data[0])),
)
err = maskErrorSuccess(err)
if ret == 0 && err == nil {
err = fmt.Errorf("GetFileVersionInfo failed")
}
if err != nil {
return nil, err
}
return data, nil
}
func verQueryValueString(block []byte, subBlock string) (string, error) {
// Allocate memory from native side to make sure the block doesn't get moved
// because we get a pointer into that memory block from the native verQueryValue
// call back.
pBlock := globalAlloc(0, uint32(len(block)))
defer globalFree(unsafe.Pointer(pBlock))
// Copy the memory region into native side memory
copy(unsafe.Slice((*byte)(pBlock), len(block)), block)
lpSubBlock, err := syscall.UTF16PtrFromString(subBlock)
if err != nil {
return "", err
}
var lplpBuffer unsafe.Pointer
var puLen uint
ret, _, err := procVerQueryValue.Call(
uintptr(pBlock),
uintptr(unsafe.Pointer(lpSubBlock)),
uintptr(unsafe.Pointer(&lplpBuffer)),
uintptr(unsafe.Pointer(&puLen)),
)
err = maskErrorSuccess(err)
if ret == 0 && err == nil {
err = fmt.Errorf("VerQueryValue failed")
}
if err != nil {
return "", err
}
if puLen <= 1 {
return "", nil
}
puLen -= 1 // Remove Null-Terminator
wchar := unsafe.Slice((*uint16)(lplpBuffer), puLen)
return string(utf16.Decode(wchar)), nil
}
func globalAlloc(uFlags uint, dwBytes uint32) unsafe.Pointer {
ret, _, _ := procGlobalAlloc.Call(
uintptr(uFlags),
uintptr(dwBytes))
if ret == 0 {
panic("globalAlloc failed")
}
return unsafe.Pointer(ret)
}
func globalFree(data unsafe.Pointer) {
ret, _, _ := procGlobalFree.Call(uintptr(data))
if ret != 0 {
panic("globalFree failed")
}
}
func maskErrorSuccess(err error) error {
if err == windows.ERROR_SUCCESS {
return nil
}
return err
}
func coTaskMemAlloc(size int) unsafe.Pointer {
ret, _, _ := procCoTaskMemAlloc.Call(
uintptr(size))
if ret == 0 {
panic("coTaskMemAlloc failed")
}
return unsafe.Pointer(ret)
}