example_config/
example_config_rust_config_lib_source.rs

1use fidl::unpersist;
2use fidl_cf_sc_internal_exampleconfig::Config as FidlConfig;
3use fuchsia_component_config::{Config as ComponentConfig, Error};
4use fuchsia_inspect::Node;
5use std::convert::TryInto;
6const EXPECTED_CHECKSUM: &[u8] = &[
7    0xff, 0x80, 0x66, 0xec, 0x7f, 0x4b, 0xf7, 0x3e, 0xa2, 0xa7, 0xce, 0xae, 0xaa, 0x11, 0x41, 0x73,
8    0xee, 0x0f, 0x44, 0xb1, 0x7d, 0x61, 0xca, 0xcd, 0xd3, 0x76, 0x77, 0x90, 0xc5, 0x1e, 0x6d, 0xbf,
9];
10const EXPECTED_CHECKSUM_LENGTH: [u8; 2] = (EXPECTED_CHECKSUM.len() as u16).to_le_bytes();
11#[derive(Debug)]
12pub struct Config {
13    pub greeting: String,
14}
15impl Config {
16    #[doc = r" Take the config startup handle and parse its contents."]
17    #[doc = r""]
18    #[doc = r" # Panics"]
19    #[doc = r""]
20    #[doc = r" If the config startup handle was already taken or if it is not valid."]
21    pub fn take_from_startup_handle() -> Self {
22        <Self as ComponentConfig>::take_from_startup_handle()
23    }
24    #[doc = r" Parse `Self` from `vmo`."]
25    pub fn from_vmo(vmo: &zx::Vmo) -> Result<Self, Error> {
26        <Self as ComponentConfig>::from_vmo(vmo)
27    }
28    #[doc = r" Parse `Self` from `bytes`."]
29    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
30        <Self as ComponentConfig>::from_bytes(bytes)
31    }
32    pub fn record_inspect(&self, inspector_node: &Node) {
33        <Self as ComponentConfig>::record_inspect(self, inspector_node)
34    }
35}
36impl ComponentConfig for Config {
37    #[doc = r" Parse `Self` from `bytes`."]
38    fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
39        let (checksum_len_bytes, bytes) = bytes.split_at_checked(2).ok_or(Error::TooFewBytes)?;
40        let checksum_len_bytes: [u8; 2] =
41            checksum_len_bytes.try_into().expect("previous call guaranteed 2 element slice");
42        let checksum_length = u16::from_le_bytes(checksum_len_bytes) as usize;
43        let (observed_checksum, bytes) =
44            bytes.split_at_checked(checksum_length).ok_or(Error::TooFewBytes)?;
45        if observed_checksum != EXPECTED_CHECKSUM {
46            return Err(Error::ChecksumMismatch {
47                expected_checksum: EXPECTED_CHECKSUM.to_vec(),
48                observed_checksum: observed_checksum.to_vec(),
49            });
50        }
51        let fidl_config: FidlConfig = unpersist(bytes).map_err(Error::Unpersist)?;
52        Ok(Self { greeting: fidl_config.greeting })
53    }
54    fn to_bytes(&self) -> Result<Vec<u8>, Error> {
55        let fidl_config = FidlConfig { greeting: self.greeting.clone() };
56        let mut fidl_bytes = fidl::persist(&fidl_config).map_err(Error::Persist)?;
57        let mut bytes = Vec::with_capacity(
58            EXPECTED_CHECKSUM_LENGTH.len() + EXPECTED_CHECKSUM.len() + fidl_bytes.len(),
59        );
60        bytes.extend_from_slice(&EXPECTED_CHECKSUM_LENGTH);
61        bytes.extend_from_slice(EXPECTED_CHECKSUM);
62        bytes.append(&mut fidl_bytes);
63        Ok(bytes)
64    }
65    fn record_inspect(&self, inspector_node: &Node) {
66        inspector_node.record_string("greeting", &self.greeting);
67    }
68}
example_config/example_config_rust_config_lib_source.rs

example_config/
example_config_rust_config_lib_source.rs
