Created
November 2, 2018 21:01
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#[derive(Debug, PartialEq)] | |
enum Error { | |
TooBig | |
} | |
type Bytes = [u8]; | |
struct Fixed { | |
length: u32 | |
} | |
impl<'a> Fixed { | |
pub fn new(length: u32) -> Fixed { | |
Fixed { | |
length: length | |
} | |
} | |
pub fn length(&self) -> u32 { | |
self.length | |
} | |
pub fn encode(&self, decoded: &'a Bytes) -> Result<&'a Bytes, Error> { | |
if decoded.len() > self.length() as usize { | |
Err(Error::TooBig) | |
} else { | |
Ok(&decoded) | |
} | |
} | |
pub fn decode(&self, decoded: &'a Bytes) -> Result<&'a Bytes, Error> { | |
if decoded.len() > self.length() as usize { | |
Err(Error::TooBig) | |
} else { | |
Ok(&decoded) | |
} | |
} | |
} | |
#[cfg(test)] | |
mod tests { | |
use super::*; | |
#[test] | |
fn fixed_0() { | |
let length = 0; | |
let fixed = Fixed::new(length); | |
let encoded = []; | |
let decoded = []; | |
assert_eq!(fixed.length(), length); | |
assert_eq!(fixed.encode(&decoded), Ok(&encoded)); | |
assert_eq!(fixed.decode(&encoded), Ok(&decoded)); | |
assert_eq!(fixed.encode(&[1]), Err(Error::TooBig)); | |
} | |
#[test] | |
fn fixed_1() { | |
let length = 1; | |
let fixed = Fixed::new(length); | |
let encoded: [u8; 1] = [1]; | |
let decoded: [u8; 1] = [1]; | |
assert_eq!(fixed.length(), length); | |
assert_eq!(fixed.encode(&decoded).unwrap(), &encoded); | |
assert_eq!(fixed.decode(&encoded).unwrap(), &decoded); | |
} | |
} |
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