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use std;
use std::fs::OpenOptions;
use std::io::prelude::*;
use std::io::{Error, ErrorKind};
use super::ast;
use bincode::SizeLimit;
use bincode::rustc_serialize::{encode_into, decode_from};
pub fn store_items(path: &str, _: &str, ast: ast::Root) -> std::io::Result<()> {
let mut file = OpenOptions::new().append(true).create(true).open(path)?;
file.write(&[42])?;
encode_into(&ast, &mut file, SizeLimit::Infinite)
.map_err(|e| Error::new(ErrorKind::Other, e))
}
pub fn load_items(path: &str) -> std::io::Result<Vec<ast::Root>> {
let mut file = OpenOptions::new().read(true).open(path)?;
let mut v = Vec::new();
loop {
let mut tagbuf = [0];
if let Err(e) = file.read_exact(&mut tagbuf) {
if e.kind() == std::io::ErrorKind::UnexpectedEof {
break;
} else {
return Err(e);
}
} else {
assert_eq!(tagbuf[0], 42);
}
match decode_from(&mut file, SizeLimit::Infinite) {
Ok(x) => v.push(x),
Err(e) => return Err(Error::new(ErrorKind::InvalidInput, e)),
}
}
Ok(v)
}