Witch of Git - jade-rose/blob - toolchain/src/lib.rs

   1 pub mod inst;
   2 #[cfg(target_arch = "wasm32")]
   3 pub mod js;
   4
   5 pub use inst::Inst;
   6 use inst::Decode;
   7 use std::io::{self, Read};
   8
   9 pub enum Error {
  10     Io { position: usize, error: io::Error },
  11 }
  12
  13 pub fn disassemble(reader: &mut impl io::Read) -> Result<Vec<Inst>, Error> {
  14     let mut results = Vec::new();
  15     let mut reader = PositionedRead::new(reader);
  16     loop {
  17         match Inst::decode(&mut reader) {
  18             Ok(inst) => results.push(inst),
  19             Err(err) if err.kind() == io::ErrorKind::UnexpectedEof => break,
  20             Err(err) => {
  21                 return Err(Error::Io {
  22                     position: reader.position,
  23                     error: err,
  24                 })
  25             }
  26         }
  27     }
  28     Ok(results)
  29 }
  30
  31 struct PositionedRead<'a, R> {
  32     inner: &'a mut R,
  33     position: usize,
  34 }
  35
  36 impl<'a, R> PositionedRead<'a, R> {
  37     pub fn new(inner: &'a mut R) -> Self {
  38         PositionedRead { inner, position: 0 }
  39     }
  40 }
  41
  42 impl<'a, R: Read> Read for PositionedRead<'a, R> {
  43     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
  44         let read = self.inner.read(buf)?;
  45         self.position += read;
  46         Ok(read)
  47     }
  48 }