Fast and simple file reading for Rust.
Filebuffer can map files into memory. This is often faster than using the
primitives in std::io, and also more convenient. Furthermore this crate
offers prefetching and checking whether file data is resident in physical
memory (so access will not incur a page fault). This enables non-blocking
file reading.
Below is an implementation of the sha256sum program that is both faster and
simpler than the naive std::io equivalent. (See sha256sum_filebuffer and
sha256sum_naive in the examples directory.)
```rust use std::env; use crypto::digest::Digest; use crypto::sha2::Sha256; use filebuffer::FileBuffer;
extern crate crypto; extern crate filebuffer;
fn main() { for fname in env::args().skip(1) { let fbuffer = FileBuffer::open(&fname).expect("failed to open file"); let mut hasher = Sha256::new(); hasher.input(&fbuffer); println!("{} {}", hasher.result_str(), fname); } } ```
Filebuffer is licensed under the Apache 2.0 license. It may be used in free software as well as closed-source applications, both for commercial and non-commercial use under the conditions given in the license. If you want to use Filebuffer in your GPLv2-licensed software, you can add an exception to your copyright notice.