countio

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The wrapper struct to enable byte counting for std::io::{Read, Write, Seek} and its asynchronous variants from futures and tokio crates.

Features

• std to enable std::io::{Read, Write, Seek}. Enabled by default.
• futures to enable futures_io::{AsyncRead, AsyncWrite, AsyncSeek}.
• tokio to enable tokio::io::{AsyncRead, AsyncWrite, AsyncSeek}.

Examples

• std::io::Read:

use std::io::{BufRead, BufReader, Result};
use countio::Counter;

fn main() -> Result<()> {
    let reader = "Hello World!".as_bytes();
    let reader = BufReader::new(reader);
    let mut reader = Counter::new(reader);

    let mut buf = String::new();
    let len = reader.read_line(&mut buf)?;

    assert_eq!(len, reader.reader_bytes());
    Ok(())
}

• std::io::Write:

use std::io::{BufWriter, Write, Result};
use countio::Counter;

fn main() -> Result<()> {
    let writer = Vec::new();
    let writer = BufWriter::new(writer);
    let mut writer = Counter::new(writer);

    let buf = "Hello World!".as_bytes();
    let len = writer.write(buf)?;
    writer.flush()?;

    assert_eq!(len, writer.writer_bytes());
    Ok(())
}

Other crates

• SOF3/count-write