// Original implementation Copyright 2013 The Rust Project Developers <https://github.com/rust-lang> | |
// | |
// Original source file: https://github.com/rust-lang/rust/blob/master/src/libstd/io/buffered.rs | |
// | |
// Modifications copyright 2016-2018 Austin Bonander <austin.bonander@gmail.com> | |
// | |
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
// option. This file may not be copied, modified, or distributed | |
// except according to those terms. | |
//! These tests are copied from rust/src/libstd/io/buffered.rs | |
//! They assume exact capacity allocation | |
use std::io::prelude::*; | |
use std::io::{self, SeekFrom}; | |
use {BufReader, BufWriter, LineWriter}; | |
/// A dummy reader intended at testing short-reads propagation. | |
pub struct ShortReader { | |
pub lengths: Vec<usize>, | |
} | |
impl Read for ShortReader { | |
fn read(&mut self, _: &mut [u8]) -> io::Result<usize> { | |
if self.lengths.is_empty() { | |
Ok(0) | |
} else { | |
Ok(self.lengths.remove(0)) | |
} | |
} | |
} | |
#[test] | |
fn test_buffered_reader() { | |
let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4]; | |
let mut reader = BufReader::with_capacity(2, inner); | |
let mut buf = [0, 0, 0]; | |
let nread = reader.read(&mut buf); | |
assert_eq!(nread.unwrap(), 3); | |
let b: &[_] = &[5, 6, 7]; | |
assert_eq!(buf, b); | |
let mut buf = [0, 0]; | |
let nread = reader.read(&mut buf); | |
assert_eq!(nread.unwrap(), 2); | |
let b: &[_] = &[0, 1]; | |
assert_eq!(buf, b); | |
let mut buf = [0]; | |
let nread = reader.read(&mut buf); | |
assert_eq!(nread.unwrap(), 1); | |
let b: &[_] = &[2]; | |
assert_eq!(buf, b); | |
let mut buf = [0, 0, 0]; | |
let nread = reader.read(&mut buf); | |
assert_eq!(nread.unwrap(), 1); | |
let b: &[_] = &[3, 0, 0]; | |
assert_eq!(buf, b); | |
let nread = reader.read(&mut buf); | |
assert_eq!(nread.unwrap(), 1); | |
let b: &[_] = &[4, 0, 0]; | |
assert_eq!(buf, b); | |
assert_eq!(reader.read(&mut buf).unwrap(), 0); | |
} | |
#[test] | |
fn test_buffered_reader_seek() { | |
let inner: &[u8] = &[5, 6, 7, 0, 1, 2, 3, 4]; | |
let mut reader = BufReader::with_capacity(2, io::Cursor::new(inner)); | |
assert_eq!(reader.seek(SeekFrom::Start(3)).ok(), Some(3)); | |
assert_eq!(reader.fill_buf().ok(), Some(&[0, 1][..])); | |
assert_eq!(reader.seek(SeekFrom::Current(0)).ok(), Some(3)); | |
assert_eq!(reader.fill_buf().ok(), Some(&[0, 1][..])); | |
assert_eq!(reader.seek(SeekFrom::Current(1)).ok(), Some(4)); | |
assert_eq!(reader.fill_buf().ok(), Some(&[1, 2][..])); | |
reader.consume(1); | |
assert_eq!(reader.seek(SeekFrom::Current(-2)).ok(), Some(3)); | |
} | |
#[test] | |
fn test_buffered_reader_seek_underflow() { | |
// gimmick reader that yields its position modulo 256 for each byte | |
struct PositionReader { | |
pos: u64 | |
} | |
impl Read for PositionReader { | |
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> { | |
let len = buf.len(); | |
for x in buf { | |
*x = self.pos as u8; | |
self.pos = self.pos.wrapping_add(1); | |
} | |
Ok(len) | |
} | |
} | |
impl Seek for PositionReader { | |
fn seek(&mut self, pos: SeekFrom) -> io::Result<u64> { | |
match pos { | |
SeekFrom::Start(n) => { | |
self.pos = n; | |
} | |
SeekFrom::Current(n) => { | |
self.pos = self.pos.wrapping_add(n as u64); | |
} | |
SeekFrom::End(n) => { | |
self.pos = u64::max_value().wrapping_add(n as u64); | |
} | |
} | |
Ok(self.pos) | |
} | |
} | |
let mut reader = BufReader::with_capacity(5, PositionReader { pos: 0 }); | |
assert_eq!(reader.fill_buf().ok(), Some(&[0, 1, 2, 3, 4][..])); | |
assert_eq!(reader.seek(SeekFrom::End(-5)).ok(), Some(u64::max_value()-5)); | |
assert_eq!(reader.fill_buf().ok().map(|s| s.len()), Some(5)); | |
// the following seek will require two underlying seeks | |
let expected = 9223372036854775802; | |
assert_eq!(reader.seek(SeekFrom::Current(i64::min_value())).ok(), Some(expected)); | |
assert_eq!(reader.fill_buf().ok().map(|s| s.len()), Some(5)); | |
// seeking to 0 should empty the buffer. | |
assert_eq!(reader.seek(SeekFrom::Current(0)).ok(), Some(expected)); | |
assert_eq!(reader.get_ref().pos, expected); | |
} | |
#[test] | |
fn test_read_until() { | |
let inner: &[u8] = &[0, 1, 2, 1, 0]; | |
let mut reader = BufReader::with_capacity(2, inner); | |
let mut v = Vec::new(); | |
reader.read_until(0, &mut v).unwrap(); | |
assert_eq!(v, [0]); | |
v.truncate(0); | |
reader.read_until(2, &mut v).unwrap(); | |
assert_eq!(v, [1, 2]); | |
v.truncate(0); | |
reader.read_until(1, &mut v).unwrap(); | |
assert_eq!(v, [1]); | |
v.truncate(0); | |
reader.read_until(8, &mut v).unwrap(); | |
assert_eq!(v, [0]); | |
v.truncate(0); | |
reader.read_until(9, &mut v).unwrap(); | |
assert_eq!(v, []); | |
} | |
#[test] | |
fn test_read_line() { | |
let in_buf: &[u8] = b"a\nb\nc"; | |
let mut reader = BufReader::with_capacity(2, in_buf); | |
let mut s = String::new(); | |
reader.read_line(&mut s).unwrap(); | |
assert_eq!(s, "a\n"); | |
s.truncate(0); | |
reader.read_line(&mut s).unwrap(); | |
assert_eq!(s, "b\n"); | |
s.truncate(0); | |
reader.read_line(&mut s).unwrap(); | |
assert_eq!(s, "c"); | |
s.truncate(0); | |
reader.read_line(&mut s).unwrap(); | |
assert_eq!(s, ""); | |
} | |
#[test] | |
fn test_lines() { | |
let in_buf: &[u8] = b"a\nb\nc"; | |
let reader = BufReader::with_capacity(2, in_buf); | |
let mut it = reader.lines(); | |
assert_eq!(it.next().unwrap().unwrap(), "a".to_string()); | |
assert_eq!(it.next().unwrap().unwrap(), "b".to_string()); | |
assert_eq!(it.next().unwrap().unwrap(), "c".to_string()); | |
assert!(it.next().is_none()); | |
} | |
#[test] | |
fn test_short_reads() { | |
let inner = ShortReader{lengths: vec![0, 1, 2, 0, 1, 0]}; | |
let mut reader = BufReader::new(inner); | |
let mut buf = [0, 0]; | |
assert_eq!(reader.read(&mut buf).unwrap(), 0); | |
assert_eq!(reader.read(&mut buf).unwrap(), 1); | |
assert_eq!(reader.read(&mut buf).unwrap(), 2); | |
assert_eq!(reader.read(&mut buf).unwrap(), 0); | |
assert_eq!(reader.read(&mut buf).unwrap(), 1); | |
assert_eq!(reader.read(&mut buf).unwrap(), 0); | |
assert_eq!(reader.read(&mut buf).unwrap(), 0); | |
} | |
#[cfg(feature = "nightly")] | |
#[test] | |
fn read_char_buffered() { | |
let buf = [195, 159]; | |
let reader = BufReader::with_capacity(1, &buf[..]); | |
assert_eq!(reader.chars().next().unwrap().unwrap(), 'ß'); | |
} | |
#[cfg(feature = "nightly")] | |
#[test] | |
fn test_chars() { | |
let buf = [195, 159, b'a']; | |
let reader = BufReader::with_capacity(1, &buf[..]); | |
let mut it = reader.chars(); | |
assert_eq!(it.next().unwrap().unwrap(), 'ß'); | |
assert_eq!(it.next().unwrap().unwrap(), 'a'); | |
assert!(it.next().is_none()); | |
} | |
// BufWriter tests | |
#[test] | |
fn test_buffered_writer() { | |
let inner = Vec::new(); | |
let mut writer = BufWriter::with_capacity(2, inner); | |
assert_eq!(writer.capacity(), 2); | |
writer.write(&[0, 1]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1]); | |
writer.write(&[2]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1]); | |
writer.write(&[3]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1]); | |
writer.flush().unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 2, 3]); | |
writer.write(&[4]).unwrap(); | |
writer.write(&[5]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 2, 3]); | |
writer.write(&[6]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5]); | |
writer.write(&[7, 8]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8]); | |
writer.write(&[9, 10, 11]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]); | |
writer.flush().unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]); | |
} | |
#[test] | |
fn test_buffered_writer_inner_flushes() { | |
let mut w = BufWriter::with_capacity(3, Vec::new()); | |
w.write(&[0, 1]).unwrap(); | |
assert_eq!(*w.get_ref(), []); | |
let w = w.into_inner().unwrap(); | |
assert_eq!(w, [0, 1]); | |
} | |
#[test] | |
fn test_buffered_writer_seek() { | |
let mut w = BufWriter::with_capacity(3, io::Cursor::new(Vec::new())); | |
w.write_all(&[0, 1, 2, 3, 4, 5]).unwrap(); | |
w.write_all(&[6, 7]).unwrap(); | |
assert_eq!(w.seek(SeekFrom::Current(0)).ok(), Some(8)); | |
assert_eq!(&w.get_ref().get_ref()[..], &[0, 1, 2, 3, 4, 5, 6, 7][..]); | |
assert_eq!(w.seek(SeekFrom::Start(2)).ok(), Some(2)); | |
w.write_all(&[8, 9]).unwrap(); | |
assert_eq!(&w.into_inner().unwrap().into_inner()[..], &[0, 1, 8, 9, 4, 5, 6, 7]); | |
} | |
#[test] | |
fn test_line_buffer() { | |
let mut writer = LineWriter::new(Vec::new()); | |
writer.write(&[0]).unwrap(); | |
assert_eq!(*writer.get_ref(), []); | |
writer.write(&[1]).unwrap(); | |
assert_eq!(*writer.get_ref(), []); | |
writer.flush().unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1]); | |
writer.write(&[0, b'\n', 1, b'\n', 2]).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 0, b'\n', 1, b'\n']); | |
writer.flush().unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 0, b'\n', 1, b'\n', 2]); | |
writer.write(&[3, b'\n']).unwrap(); | |
assert_eq!(*writer.get_ref(), [0, 1, 0, b'\n', 1, b'\n', 2, 3, b'\n']); | |
} | |
#[test] | |
fn test_buf_writer_drops_once() { | |
struct CountDrops(usize); | |
impl Write for CountDrops { | |
fn write(&mut self, _buf: &[u8]) -> io::Result<usize> { | |
unimplemented!() | |
} | |
fn flush(&mut self) -> io::Result<()> { | |
unimplemented!() | |
} | |
} | |
impl Drop for CountDrops { | |
fn drop(&mut self) { | |
assert_eq!(self.0, 0); | |
self.0 += 1; | |
} | |
} | |
let writer = BufWriter::new(CountDrops(0)); | |
let (_, _) = writer.into_inner_with_buffer(); | |
} |