Creates a new BufReader with a default buffer capacity.

Examples

use std::io::BufReader;
use std::fs::File;

let f = File::open("log.txt")?;
let reader = BufReader::new(f);

Creates a new BufReader with the specified buffer capacity.

Examples

Creating a buffer with ten bytes of capacity:

use std::io::BufReader;
use std::fs::File;

let f = File::open("log.txt")?;
let reader = BufReader::with_capacity(10, f);

Gets a reference to the underlying reader.

It is inadvisable to directly read from the underlying reader.

Examples

use std::io::BufReader;
use std::fs::File;

let f1 = File::open("log.txt")?;
let reader = BufReader::new(f1);

let f2 = reader.get_ref();

Gets a mutable reference to the underlying reader.

It is inadvisable to directly read from the underlying reader.

Examples

use std::io::BufReader;
use std::fs::File;

let f1 = File::open("log.txt")?;
let mut reader = BufReader::new(f1);

let f2 = reader.get_mut();

Returns true if there are no bytes in the internal buffer.

Examples

use std::io::BufReader;
use std::io::BufRead;
use std::fs::File;

let f1 = File::open("log.txt")?;
let mut reader = BufReader::new(f1);
assert!(reader.is_empty());

if reader.fill_buf()?.len() > 0 {
    assert!(!reader.is_empty());
}

Unwraps this BufReader, returning the underlying reader.

Note that any leftover data in the internal buffer is lost.

Examples

use std::io::BufReader;
use std::fs::File;

let f1 = File::open("log.txt")?;
let reader = BufReader::new(f1);

let f2 = reader.into_inner();

Pull some bytes from this source into the specified buffer, returning how many bytes were read. Read more

Determines if this Reader can work with buffers of uninitialized memory. Read more

Read all bytes until EOF in this source, placing them into buf. Read more

Read all bytes until EOF in this source, placing them into buf. Read more

Read the exact number of bytes required to fill buf. Read more

Creates a "by reference" adaptor for this instance of Read. Read more

Transforms this Read instance to an [Iterator] over its bytes. Read more

Transforms this Read instance to an [Iterator] over [char]s. Read more

Creates an adaptor which will chain this stream with another. Read more

Creates an adaptor which will read at most limit bytes from it. Read more

Fills the internal buffer of this object, returning the buffer contents. Read more

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to read. Read more

Read all bytes into buf until the delimiter byte or EOF is reached. Read more

Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided buffer. Read more

Returns an iterator over the contents of this reader split on the byte byte. Read more

Returns an iterator over the lines of this reader. Read more

Formats the value using the given formatter. Read more

Seek to an offset, in bytes, in the underlying reader.

The position used for seeking with SeekFrom::Current(_) is the position the underlying reader would be at if the BufReader had no internal buffer.

Seeking always discards the internal buffer, even if the seek position would otherwise fall within it. This guarantees that calling .into_inner() immediately after a seek yields the underlying reader at the same position.

See std::io::Seek for more details.

Note: In the edge case where you're seeking with SeekFrom::Current(n) where n minus the internal buffer length underflows an i64, two seeks will be performed instead of one. If the second seek returns Err, the underlying reader will be left at the same position it would have if you seeked to SeekFrom::Current(0).