rev_buf_reader
This Rust crate provides a buffered reader capable of reading chunks of bytes of a data stream in reverse order. Its implementation is an adapted copy of BufReader from the nightly std::io.
Usage
Reading chunks of bytes in reverse order:
extern crate rev_buf_reader;
use rev_buf_reader::RevBufReader;
use std::io::{self, Read};
let data = [0, 1, 2, 3, 4, 5, 6, 7];
let inner = io::Cursor::new(&data);
let mut reader = RevBufReader::new(inner);
let mut buffer = [0, 0, 0];
assert_eq!(reader.read(&mut buffer).ok(), Some(3));
assert_eq!(buffer, [5, 6, 7]);
let mut buffer = [0, 0, 0, 0, 0];
assert_eq!(reader.read(&mut buffer).ok(), Some(5));
assert_eq!(buffer, [0, 1, 2, 3, 4]);
Reading text lines in reverse order:
extern crate rev_buf_reader;
use rev_buf_reader::RevBufReader;
use std::io::{self, BufRead};
let data = "This\nis\na sentence";
let inner = io::Cursor::new(&data);
let reader = RevBufReader::new(inner);
let mut lines = reader.lines();
assert_eq!(lines.next().unwrap().unwrap(), "a sentence".to_string());
assert_eq!(lines.next().unwrap().unwrap(), "is".to_string());
assert_eq!(lines.next().unwrap().unwrap(), "This".to_string());
assert!(lines.next().is_none());
Features
rev_buf_reader has one feature: read_initializer
, which corresponds to an
experimental feature of nightly Rust. If you use it in your project by adding
#![feature(read_initializer)]
, you'll need to enable it for rev_buf_reader
as well in your Cargo.toml.