bt_gap_config/
bt_gap_config_rust_config_lib_source.rs

1use fidl::unpersist;
2use fidl_cf_sc_internal_btgapconfig::Config as FidlConfig;
3use fuchsia_inspect::Node;
4use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
5use std::convert::TryInto;
6const EXPECTED_CHECKSUM: &[u8] = &[
7    0x1c, 0xbb, 0x3f, 0x24, 0x89, 0x00, 0x00, 0x5d, 0x4c, 0xd8, 0x73, 0xbc, 0x20, 0x94, 0xec, 0x68,
8    0x95, 0xd6, 0xf3, 0x1a, 0x90, 0x90, 0xdb, 0x99, 0x5e, 0xc2, 0xf7, 0xa0, 0x90, 0x50, 0x34, 0x31,
9];
10#[derive(Debug)]
11pub struct Config {
12    pub bredr_connectable: bool,
13    pub bredr_security_mode: String,
14    pub le_background_scanning: bool,
15    pub le_privacy: bool,
16    pub le_security_mode: String,
17}
18impl Config {
19    #[doc = r" Take the config startup handle and parse its contents."]
20    #[doc = r""]
21    #[doc = r" # Panics"]
22    #[doc = r""]
23    #[doc = r" If the config startup handle was already taken or if it is not valid."]
24    pub fn take_from_startup_handle() -> Self {
25        let handle_info = HandleInfo::new(HandleType::ComponentConfigVmo, 0);
26        let config_vmo: zx::Vmo =
27            take_startup_handle(handle_info).expect("Config VMO handle must be present.").into();
28        Self::from_vmo(&config_vmo).expect("Config VMO handle must be valid.")
29    }
30    #[doc = r" Parse `Self` from `vmo`."]
31    pub fn from_vmo(vmo: &zx::Vmo) -> Result<Self, Error> {
32        let config_size = vmo.get_content_size().map_err(Error::GettingContentSize)?;
33        let config_bytes = vmo.read_to_vec(0, config_size).map_err(Error::ReadingConfigBytes)?;
34        Self::from_bytes(&config_bytes)
35    }
36    #[doc = r" Parse `Self` from `bytes`."]
37    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
38        let (checksum_len_bytes, bytes) = bytes.split_at_checked(2).ok_or(Error::TooFewBytes)?;
39        let checksum_len_bytes: [u8; 2] =
40            checksum_len_bytes.try_into().expect("previous call guaranteed 2 element slice");
41        let checksum_length = u16::from_le_bytes(checksum_len_bytes) as usize;
42        let (observed_checksum, bytes) =
43            bytes.split_at_checked(checksum_length).ok_or(Error::TooFewBytes)?;
44        if observed_checksum != EXPECTED_CHECKSUM {
45            return Err(Error::ChecksumMismatch { observed_checksum: observed_checksum.to_vec() });
46        }
47        let fidl_config: FidlConfig = unpersist(bytes).map_err(Error::Unpersist)?;
48        Ok(Self {
49            bredr_connectable: fidl_config.bredr_connectable,
50            bredr_security_mode: fidl_config.bredr_security_mode,
51            le_background_scanning: fidl_config.le_background_scanning,
52            le_privacy: fidl_config.le_privacy,
53            le_security_mode: fidl_config.le_security_mode,
54        })
55    }
56    pub fn record_inspect(&self, inspector_node: &Node) {
57        inspector_node.record_bool("bredr_connectable", self.bredr_connectable);
58        inspector_node.record_string("bredr_security_mode", &self.bredr_security_mode);
59        inspector_node.record_bool("le_background_scanning", self.le_background_scanning);
60        inspector_node.record_bool("le_privacy", self.le_privacy);
61        inspector_node.record_string("le_security_mode", &self.le_security_mode);
62    }
63}
64#[derive(Debug)]
65pub enum Error {
66    #[doc = r" Failed to read the content size of the VMO."]
67    GettingContentSize(zx::Status),
68    #[doc = r" Failed to read the content of the VMO."]
69    ReadingConfigBytes(zx::Status),
70    #[doc = r" The VMO was too small for this config library."]
71    TooFewBytes,
72    #[doc = r" The VMO's config ABI checksum did not match this library's."]
73    ChecksumMismatch { observed_checksum: Vec<u8> },
74    #[doc = r" Failed to parse the non-checksum bytes of the VMO as this library's FIDL type."]
75    Unpersist(fidl::Error),
76}
77impl std::fmt::Display for Error {
78    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
79        match self {
80            Self::GettingContentSize(status) => {
81                write!(f, "Failed to get content size: {status}")
82            }
83            Self::ReadingConfigBytes(status) => {
84                write!(f, "Failed to read VMO content: {status}")
85            }
86            Self::TooFewBytes => {
87                write!(f, "VMO content is not large enough for this config library.")
88            }
89            Self::ChecksumMismatch { observed_checksum } => {
90                write!(
91                    f,
92                    "ABI checksum mismatch, expected {:?}, got {:?}",
93                    EXPECTED_CHECKSUM, observed_checksum,
94                )
95            }
96            Self::Unpersist(fidl_error) => {
97                write!(f, "Failed to parse contents of config VMO: {fidl_error}")
98            }
99        }
100    }
101}
102impl std::error::Error for Error {
103    #[allow(unused_parens, reason = "rustfmt errors without parens here")]
104    fn source(&self) -> Option<(&'_ (dyn std::error::Error + 'static))> {
105        match self {
106            Self::GettingContentSize(ref status) | Self::ReadingConfigBytes(ref status) => {
107                Some(status)
108            }
109            Self::TooFewBytes => None,
110            Self::ChecksumMismatch { .. } => None,
111            Self::Unpersist(ref fidl_error) => Some(fidl_error),
112        }
113    }
114    fn description(&self) -> &str {
115        match self {
116            Self::GettingContentSize(_) => "getting content size",
117            Self::ReadingConfigBytes(_) => "reading VMO contents",
118            Self::TooFewBytes => "VMO contents too small",
119            Self::ChecksumMismatch { .. } => "ABI checksum mismatch",
120            Self::Unpersist(_) => "FIDL parsing error",
121        }
122    }
123}
bt_gap_config/bt_gap_config_rust_config_lib_source.rs

bt_gap_config/
bt_gap_config_rust_config_lib_source.rs
