use std::io::{self, Read, Write};
use byteorder::{ReadBytesExt, WriteBytesExt};
use crate::control::variable_header::VariableHeaderError;
use crate::{Decodable, Encodable};
pub const SPEC_3_1_0: u8 = 0x03;
pub const SPEC_3_1_1: u8 = 0x04;
pub const SPEC_5_0: u8 = 0x05;
#[derive(Debug, Eq, PartialEq, Copy, Clone)]
#[repr(u8)]
pub enum ProtocolLevel {
Version310 = SPEC_3_1_0,
Version311 = SPEC_3_1_1,
Version50 = SPEC_5_0,
}
impl Encodable for ProtocolLevel {
fn encode<W: Write>(&self, writer: &mut W) -> Result<(), io::Error> {
writer.write_u8(*self as u8)
}
fn encoded_length(&self) -> u32 {
1
}
}
impl Decodable for ProtocolLevel {
type Error = VariableHeaderError;
type Cond = ();
fn decode_with<R: Read>(reader: &mut R, _rest: ()) -> Result<ProtocolLevel, VariableHeaderError> {
reader
.read_u8()
.map_err(From::from)
.map(ProtocolLevel::from_u8)
.and_then(|x| x.ok_or(VariableHeaderError::InvalidProtocolVersion))
}
}
impl ProtocolLevel {
pub fn from_u8(n: u8) -> Option<ProtocolLevel> {
match n {
SPEC_3_1_0 => Some(ProtocolLevel::Version310),
SPEC_3_1_1 => Some(ProtocolLevel::Version311),
SPEC_5_0 => Some(ProtocolLevel::Version50),
_ => None,
}
}
}