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use std::io::{self,BufRead,BufReader}; | |
enum Utf8DecoderError<'a> { | |
InvalidBytes(&'a [u8]), | |
Io(io::Error), | |
} | |
struct Utf8Decoder<B: BufRead> { | |
reader : B, | |
bytes_read: usize | |
} | |
enum DecodeResult<'a> { | |
EOF, | |
Error(Utf8DecoderError<'a>), | |
Char(char) | |
} | |
impl<B: BufRead> Utf8Decoder<B> { | |
fn new(r : B) -> Self { | |
Self { reader: r, bytes_read: 0 } | |
} | |
fn decode(&mut self) -> DecodeResult { | |
DecodeResult::Char('\0') | |
} | |
} | |
fn main() { | |
let s = String::from("Hello, world!"); | |
let b = BufReader::new(s.as_bytes()); | |
let decoder = Utf8Decoder::new(b); | |
loop { | |
match decoder.decode() { | |
DecodeResult::EOF => { | |
break; | |
} | |
DecodeResult::Error(e) => panic!("Failed"), | |
DecodeResult::Char(c) => { | |
println!("{}", c); | |
} | |
} | |
} | |
} |
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