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
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
use std::time::Duration;
use libc::c_int;
use sys::*;
use error::{self, Error};
pub struct Handle {
ptr: *mut hid_device,
}
impl Handle {
#[doc(hidden)]
pub unsafe fn new(ptr: *mut hid_device) -> Self {
Handle {
ptr: ptr,
}
}
#[doc(hidden)]
pub unsafe fn as_ptr(&self) -> *const hid_device {
self.ptr as *const _
}
#[doc(hidden)]
pub unsafe fn as_mut_ptr(&mut self) -> *mut hid_device {
self.ptr
}
}
impl Handle {
/// Set the handle in blocking or non-blocking mode.
pub fn blocking(&mut self, value: bool) -> error::Result<()> {
unsafe {
match hid_set_nonblocking(self.as_mut_ptr(), if value { 1 } else { 0 }) {
0 =>
Ok(()),
_ =>
Err(Error::General)
}
}
}
/// The data accessor.
pub fn data(&mut self) -> Data {
unsafe {
Data::new(self)
}
}
/// The feature accessor.
pub fn feature(&mut self) -> Feature {
unsafe {
Feature::new(self)
}
}
}
/// The data accessor.
pub struct Data<'a> {
handle: &'a mut Handle,
}
impl<'a> Data<'a> {
#[doc(hidden)]
pub unsafe fn new(handle: &mut Handle) -> Data {
Data { handle: handle }
}
/// Write data to the device.
///
/// The first byte must be the report ID.
pub fn write<T: AsRef<[u8]>>(&mut self, data: T) -> error::Result<usize> {
let data = data.as_ref();
unsafe {
match hid_write(self.handle.as_mut_ptr(), data.as_ptr(), data.len()) {
-1 =>
Err(Error::Write),
length =>
Ok(length as usize)
}
}
}
/// Write data to the device with the given report ID.
pub fn write_to<T: AsRef<[u8]>>(&mut self, id: u8, data: T) -> error::Result<usize> {
let data = data.as_ref();
let mut buffer = Vec::with_capacity(data.len() + 1);
buffer.push(id);
buffer.extend(data);
self.write(&buffer)
}
/// Read data from the device.
///
/// If the device supports reports the first byte will contain the report ID.
///
/// Returns the amount of read bytes or `None` if there was a timeout.
pub fn read<T: AsMut<[u8]>>(&mut self, mut data: T, timeout: Duration) -> error::Result<Option<usize>> {
let data = data.as_mut();
let result = if timeout.as_secs() == 0 && timeout.subsec_nanos() == 0 {
unsafe {
hid_read(self.handle.as_mut_ptr(), data.as_mut_ptr(), data.len())
}
}
else {
unsafe {
// Timeout is in milliseconds.
hid_read_timeout(self.handle.as_mut_ptr(), data.as_mut_ptr(), data.len(),
timeout.as_secs() as c_int * 1_000 + timeout.subsec_nanos() as c_int / 1_000_000)
}
};
match result {
-1 =>
Err(Error::Read),
0 =>
Ok(None),
v =>
Ok(Some(v as usize))
}
}
/// Read data from the device.
///
/// Returns the report ID and the amount of read bytes or `None` if there was a timeout.
pub fn read_from<T: AsMut<[u8]>>(&mut self, mut data: T, timeout: Duration) -> error::Result<Option<(u8, usize)>> {
let mut data = data.as_mut();
let mut buffer = Vec::with_capacity(data.len() + 1);
match try!(self.read(&mut buffer, timeout)) {
None => {
Ok(None)
}
Some(length) => {
data.clone_from_slice(&buffer[1..length]);
Ok(Some((data[0], length - 1)))
}
}
}
}
/// The feature accessor.
pub struct Feature<'a> {
handle: &'a mut Handle,
}
impl<'a> Feature<'a> {
#[doc(hidden)]
pub unsafe fn new(handle: &mut Handle) -> Feature {
Feature { handle: handle }
}
/// Send a feature request.
///
/// The first byte must be the report ID.
pub fn send<T: AsRef<[u8]>>(&mut self, data: T) -> error::Result<usize> {
let data = data.as_ref();
unsafe {
match hid_send_feature_report(self.handle.as_mut_ptr(), data.as_ptr(), data.len()) {
-1 =>
Err(Error::Write),
length =>
Ok(length as usize)
}
}
}
/// Send a feature request to the given report ID.
pub fn send_to<T: AsRef<[u8]>>(&mut self, id: u8, data: T) -> error::Result<usize> {
let data = data.as_ref();
let mut buffer = Vec::with_capacity(data.len() + 1);
buffer.push(id);
buffer.extend(data);
self.send(&buffer).map(|v| v - 1)
}
/// Get a feature request.
///
/// The first byte must be the report ID.
pub fn get<T: AsMut<[u8]>>(&mut self, mut data: T) -> error::Result<Option<usize>> {
let data = data.as_mut();
unsafe {
match hid_get_feature_report(self.handle.as_mut_ptr(), data.as_mut_ptr(), data.len()) {
-1 =>
Err(Error::Read),
0 =>
Ok(None),
v =>
Ok(Some(v as usize))
}
}
}
/// Get a feature request from the given report ID.
pub fn get_from<T: AsMut<[u8]>>(&mut self, id: u8, mut data: T) -> error::Result<Option<usize>> {
let data = data.as_mut();
let mut buffer = vec![0u8; data.len() + 1];
buffer[0] = id;
self.get(&mut buffer)
}
}
impl Drop for Handle {
fn drop(&mut self) {
unsafe {
hid_close(self.as_mut_ptr());
}
}
}
|
