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
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
extern crate comedy;
#[cfg(feature = "guid_serde")]
extern crate serde;
#[cfg(feature = "guid_serde")]
extern crate serde_derive;
extern crate winapi;
use std::ffi::{OsStr, OsString};
use std::fmt::{Debug, Display, Error, Formatter, Result};
use std::hash::{Hash, Hasher};
use std::mem;
use std::os::windows::ffi::{OsStrExt, OsStringExt};
use std::result;
use std::str::FromStr;
use comedy::check_succeeded;
use winapi::ctypes;
use winapi::shared::guiddef::GUID;
use winapi::um::combaseapi::{CLSIDFromString, StringFromGUID2};
#[cfg(feature = "guid_serde")]
use serde_derive::{Deserialize, Serialize};
const GUID_STRING_CHARACTERS: usize = 38;
#[cfg(feature = "guid_serde")]
#[allow(non_snake_case)]
#[derive(Serialize, Deserialize)]
#[serde(remote = "GUID")]
pub struct GUIDSerde {
Data1: ctypes::c_ulong,
Data2: ctypes::c_ushort,
Data3: ctypes::c_ushort,
Data4: [ctypes::c_uchar; 8],
}
#[derive(Clone)]
#[cfg_attr(feature = "guid_serde", derive(Serialize, Deserialize))]
#[repr(transparent)]
pub struct Guid(#[cfg_attr(feature = "guid_serde", serde(with = "GUIDSerde"))] pub GUID);
impl PartialEq for Guid {
fn eq(&self, other: &Guid) -> bool {
self.0.Data1 == other.0.Data1
&& self.0.Data2 == other.0.Data2
&& self.0.Data3 == other.0.Data3
&& self.0.Data4 == other.0.Data4
}
}
impl Eq for Guid {}
impl Hash for Guid {
fn hash<H: Hasher>(&self, state: &mut H) {
self.0.Data1.hash(state);
self.0.Data2.hash(state);
self.0.Data3.hash(state);
self.0.Data4.hash(state);
}
}
impl Debug for Guid {
fn fmt(&self, f: &mut Formatter) -> Result {
write!(f, "{:?}", unsafe {
&mem::transmute::<Guid, [u8; mem::size_of::<Guid>()]>(self.clone())
})
}
}
impl Display for Guid {
fn fmt(&self, f: &mut Formatter) -> Result {
let mut s: [u16; GUID_STRING_CHARACTERS + 1] = unsafe { mem::uninitialized() };
let len = unsafe {
StringFromGUID2(
&(*self).0 as *const _ as *mut _,
s.as_mut_ptr(),
s.len() as ctypes::c_int,
)
};
if len <= 0 {
return Err(Error);
}
let s = &s[..len as usize - 1];
if let Ok(s) = OsString::from_wide(&s).into_string() {
f.write_str(&s)
} else {
Err(Error)
}
}
}
impl FromStr for Guid {
type Err = comedy::error::HResult;
fn from_str(s: &str) -> result::Result<Self, Self::Err> {
let mut guid = unsafe { mem::uninitialized() };
let braced;
let s = if s.starts_with('{') {
s
} else {
braced = format!("{{{}}}", s);
braced.as_str()
};
let s: Vec<_> = OsStr::new(s).encode_wide().chain(Some(0)).collect();
unsafe { check_succeeded!(CLSIDFromString(s.as_ptr(), &mut guid)) }?;
Ok(Guid(guid))
}
}
#[cfg(test)]
mod test {
use super::Guid;
use std::str::FromStr;
#[test]
fn without_braces() {
let uuid = "F1BD1079-9F01-4BDC-8036-F09B70095066";
let guid = Guid::from_str(uuid).unwrap();
assert_eq!(format!("{}", guid), format!("{{{}}}", uuid));
}
#[test]
fn with_braces() {
let uuid = "{F1BD1079-9F01-4BDC-8036-F09B70095066}";
let guid = Guid::from_str(uuid).unwrap();
assert_eq!(format!("{}", guid), uuid);
}
#[test]
fn format_error() {
let uuid = "foo";
Guid::from_str(uuid).unwrap_err();
}
}