buffered_offset_reader

Rust crate 用于在任意偏移量处缓冲读取文件。

在 Unix 上使用 std::os::unix::fs::FileExt::read_at()（即 pread()）或在 Windows 上使用 std::os::windows::fs::FileExt::seek_read() 进行线程安全的文件读取。

示例

use buffered_offset_reader::{BufOffsetReader, OffsetReadMut};
use std::fs::File;

fn main() -> std::io::Result<()> {
    let f = File::open("log.txt")?;
    let mut reader = BufOffsetReader::new(f);
    let mut tmp = vec![0; 8];

    reader.read_at(&mut tmp, 0)?;  // read 8 bytes at offset 0

	// This read will be fulfilled by the reader's internal buffer,
	// so it won't require a system call.
    reader.read_at(&mut tmp, 32)?; // read 8 bytes at offset 32

    Ok(())
}