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use super::DescriptorError;
use hex_slice::AsHex;
use std::fmt;
pub struct RegistrationDescriptor<'buf> {
pub buf: &'buf [u8],
}
impl<'buf> RegistrationDescriptor<'buf> {
pub const TAG: u8 = 5;
pub fn new(_tag: u8, buf: &'buf [u8]) -> Result<RegistrationDescriptor<'buf>, DescriptorError> {
if buf.len() < 4 {
Err(DescriptorError::NotEnoughData {
tag: Self::TAG,
actual: buf.len(),
expected: 4,
})
} else {
Ok(RegistrationDescriptor { buf })
}
}
pub fn format_identifier(&self) -> u32 {
u32::from(self.buf[0]) << 24
| u32::from(self.buf[1]) << 16
| u32::from(self.buf[2]) << 8
| u32::from(self.buf[3])
}
pub fn additional_identification_info(&self) -> &[u8] {
&self.buf[4..]
}
}
impl<'buf> fmt::Debug for RegistrationDescriptor<'buf> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
f.debug_struct("RegistrationDescriptor")
.field("format_identifier", &self.format_identifier())
.field(
"additional_identification_info",
&format!("{:x}", self.additional_identification_info().as_hex()),
).finish()
}
}
#[cfg(test)]
mod test {
use super::super::{CoreDescriptors, Descriptor};
use super::*;
use data_encoding::hex;
#[test]
fn descriptor() {
let data = hex::decode(b"050443554549").unwrap();
let desc = CoreDescriptors::from_bytes(&data).unwrap();
assert_matches!(
desc,
CoreDescriptors::Registration(RegistrationDescriptor { buf: b"CUEI" })
);
}
}