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use serde::de;
use serde_cbor::Deserializer;
use std::io::Read;
pub fn serde_parse_err<E: de::Error>(s: &str) -> E {
E::custom(format!("Failed to parse {s}"))
}
pub fn from_slice_stream<'a, T, R: Read, E: de::Error>(data: &mut R) -> Result<T, E>
where
T: de::Deserialize<'a>,
{
let mut deserializer = Deserializer::from_reader(data);
de::Deserialize::deserialize(&mut deserializer)
.map_err(|x| serde_parse_err(&format!("{}: {}", stringify!(T), &x.to_string())))
}
// Parsing routines
pub fn read_be_u32<R: Read, E: de::Error>(data: &mut R) -> Result<u32, E> {
let mut buf = [0; 4];
data.read_exact(&mut buf)
.map_err(|_| serde_parse_err("u32"))?;
Ok(u32::from_be_bytes(buf))
}
pub fn read_be_u16<R: Read, E: de::Error>(data: &mut R) -> Result<u16, E> {
let mut buf = [0; 2];
data.read_exact(&mut buf)
.map_err(|_| serde_parse_err("u16"))?;
Ok(u16::from_be_bytes(buf))
}
pub fn read_byte<R: Read, E: de::Error>(data: &mut R) -> Result<u8, E> {
match data.bytes().next() {
Some(Ok(s)) => Ok(s),
_ => Err(serde_parse_err("u8")),
}
}