pub fn from_slice_for_signature<'d, 'r: 'd, B, T>(
bytes: &'r [u8],
ctxt: EncodingContext<B>,
signature: &Signature<'_>,
) -> Result<T>
Expand description
Deserialize T
from a given slice of bytes with the given signature.
Use this function instead of from_slice
if the value being deserialized does not implement
Type
. Also, if T
is an, or (potentially) contains an Fd
, use
from_slice_fds_for_signature
instead.
§Examples
While Type
derive supports enums, for this example, let’s supposed it doesn’t and we don’t
want to manually implement Type
trait either:
use std::convert::TryInto;
use serde::{Deserialize, Serialize};
use zvariant::{to_bytes_for_signature, from_slice_for_signature};
use zvariant::EncodingContext;
let ctxt = EncodingContext::<byteorder::LE>::new_dbus(0);
#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
enum Unit {
Variant1,
Variant2,
Variant3,
}
let signature = "u".try_into().unwrap();
let encoded = to_bytes_for_signature(ctxt, &signature, &Unit::Variant2).unwrap();
assert_eq!(encoded.len(), 4);
let decoded: Unit = from_slice_for_signature(&encoded, ctxt, &signature).unwrap();
assert_eq!(decoded, Unit::Variant2);
#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
enum NewType<'s> {
Variant1(&'s str),
Variant2(&'s str),
Variant3(&'s str),
}
let signature = "(us)".try_into().unwrap();
let encoded =
to_bytes_for_signature(ctxt, &signature, &NewType::Variant2("hello")).unwrap();
assert_eq!(encoded.len(), 14);
let decoded: NewType<'_> = from_slice_for_signature(&encoded, ctxt, &signature).unwrap();
assert_eq!(decoded, NewType::Variant2("hello"));
#[derive(Debug, PartialEq, Eq, Serialize, Deserialize)]
enum Structs {
Tuple(u8, u64),
Struct { y: u8, t: u64 },
}
// TODO: Provide convenience API to create complex signatures
let signature = "(u(yt))".try_into().unwrap();
let encoded = to_bytes_for_signature(ctxt, &signature, &Structs::Tuple(42, 42)).unwrap();
assert_eq!(encoded.len(), 24);
let decoded: Structs = from_slice_for_signature(&encoded, ctxt, &signature).unwrap();
assert_eq!(decoded, Structs::Tuple(42, 42));
let s = Structs::Struct { y: 42, t: 42 };
let encoded = to_bytes_for_signature(ctxt, &signature, &s).unwrap();
assert_eq!(encoded.len(), 24);
let decoded: Structs = from_slice_for_signature(&encoded, ctxt, &signature).unwrap();
assert_eq!(decoded, Structs::Struct { y: 42, t: 42 });