bluez_async/
bleuuid.rs

1use uuid::Uuid;
2
3const BLUETOOTH_BASE_UUID: u128 = 0x00000000_0000_1000_8000_00805f9b34fb;
4const BLUETOOTH_BASE_MASK: u128 = 0x00000000_ffff_ffff_ffff_ffffffffffff;
5const BLUETOOTH_BASE_MASK_16: u128 = 0xffff0000_ffff_ffff_ffff_ffffffffffff;
6
7/// Convert a 32-bit BLE short UUID to a full 128-bit UUID by filling in the standard Bluetooth Base
8/// UUID.
9pub const fn uuid_from_u32(short: u32) -> Uuid {
10    Uuid::from_u128(BLUETOOTH_BASE_UUID | ((short as u128) << 96))
11}
12
13/// Convert a 16-bit BLE short UUID to a full 128-bit UUID by filling in the standard Bluetooth Base
14/// UUID.
15pub const fn uuid_from_u16(short: u16) -> Uuid {
16    uuid_from_u32(short as u32)
17}
18
19/// An extension trait for `Uuid` which provides BLE-specific methods.
20pub trait BleUuid {
21    /// If the UUID is a valid BLE short UUID then return its short form, otherwise return `None`.
22    fn to_ble_u32(&self) -> Option<u32>;
23
24    /// If the UUID is a valid 16-bit BLE short UUID then return its short form, otherwise return
25    /// `None`.
26    fn to_ble_u16(&self) -> Option<u16>;
27
28    /// Convert the UUID to a string, using short format if applicable.
29    fn succinctly(&self) -> String;
30}
31
32impl BleUuid for Uuid {
33    fn to_ble_u32(&self) -> Option<u32> {
34        let value = self.as_u128();
35        if value & BLUETOOTH_BASE_MASK == BLUETOOTH_BASE_UUID {
36            Some((value >> 96) as u32)
37        } else {
38            None
39        }
40    }
41
42    fn to_ble_u16(&self) -> Option<u16> {
43        let value = self.as_u128();
44        if value & BLUETOOTH_BASE_MASK_16 == BLUETOOTH_BASE_UUID {
45            Some((value >> 96) as u16)
46        } else {
47            None
48        }
49    }
50
51    fn succinctly(&self) -> String {
52        if let Some(uuid16) = self.to_ble_u16() {
53            format!("{:#04x}", uuid16)
54        } else if let Some(uuid32) = self.to_ble_u32() {
55            format!("{:#06x}", uuid32)
56        } else {
57            self.to_string()
58        }
59    }
60}
61
62#[cfg(test)]
63mod tests {
64    use super::*;
65
66    #[test]
67    fn uuid_from_u32_test() {
68        assert_eq!(
69            uuid_from_u32(0x11223344),
70            Uuid::parse_str("11223344-0000-1000-8000-00805f9b34fb").unwrap()
71        );
72    }
73
74    #[test]
75    fn uuid_from_u16_test() {
76        assert_eq!(
77            uuid_from_u16(0x1122),
78            Uuid::parse_str("00001122-0000-1000-8000-00805f9b34fb").unwrap()
79        );
80    }
81
82    #[test]
83    fn uuid_to_from_u16_success() {
84        let uuid = Uuid::parse_str("00001234-0000-1000-8000-00805f9b34fb").unwrap();
85        assert_eq!(uuid_from_u16(uuid.to_ble_u16().unwrap()), uuid);
86    }
87
88    #[test]
89    fn uuid_to_from_u32_success() {
90        let uuid = Uuid::parse_str("12345678-0000-1000-8000-00805f9b34fb").unwrap();
91        assert_eq!(uuid_from_u32(uuid.to_ble_u32().unwrap()), uuid);
92    }
93
94    #[test]
95    fn uuid_to_u16_fail() {
96        assert_eq!(
97            Uuid::parse_str("12345678-0000-1000-8000-00805f9b34fb")
98                .unwrap()
99                .to_ble_u16(),
100            None
101        );
102        assert_eq!(
103            Uuid::parse_str("12340000-0000-1000-8000-00805f9b34fb")
104                .unwrap()
105                .to_ble_u16(),
106            None
107        );
108        assert_eq!(Uuid::nil().to_ble_u16(), None);
109    }
110
111    #[test]
112    fn uuid_to_u32_fail() {
113        assert_eq!(
114            Uuid::parse_str("12345678-9000-1000-8000-00805f9b34fb")
115                .unwrap()
116                .to_ble_u32(),
117            None
118        );
119        assert_eq!(Uuid::nil().to_ble_u32(), None);
120    }
121
122    #[test]
123    fn succinctly_u16() {
124        let uuid = uuid_from_u16(0x1122);
125        assert_eq!(uuid.succinctly(), "0x1122");
126    }
127
128    #[test]
129    fn succinctly_u32() {
130        let uuid = uuid_from_u32(0x11223344);
131        assert_eq!(uuid.succinctly(), "0x11223344");
132    }
133
134    #[test]
135    fn succinctly_long() {
136        let uuid_str = "12345678-9000-1000-8000-00805f9b34fb";
137        let uuid = Uuid::parse_str(uuid_str).unwrap();
138        assert_eq!(uuid.succinctly(), uuid_str);
139    }
140}
bluez_async/bleuuid.rs

bluez_async/
bleuuid.rs
