Struct multi_readers::BytesReader

pub struct BytesReader { /* private fields */ }

A bytes wrapper and implements trait Read

Usage

use multi_readers::BytesReader;
use std::io::Read;
let bytes = b"hello world";
let mut reader = BytesReader::new(bytes.to_vec());
let mut buf = [0; 6];
let size = reader.read(&mut buf).unwrap();
assert_eq!(&buf[..size], b"hello ");
let size = reader.read(&mut buf).unwrap();
assert_eq!(&buf[..size], b"world");

Implementations

impl BytesReader

pub fn new(buf: Vec<u8>) -> BytesReader

Create a new BytesReader with bytes

Examples found in repository

examples/test.rs (line 5)

fn main() -> std::io::Result<()> {
    let slice = SliceReader::new(b"hello");
    let bytes = BytesReader::new(b"world".to_vec());
    let mut reader = join_readers!(slice, bytes);
    let mut buf = [0; 5];
    let len = reader.read(&mut buf)?;
    assert_eq!(b"hello", &buf[..len]);
    let len = reader.read(&mut buf)?;
    assert_eq!(b"world", &buf[..len]);

    let slice = SliceReader::new(b"First-");
    let bytes = BytesReader::new(b"Second-".to_vec());
    std::fs::write("test.txt", b"Third")?;
    let f = File::open("test.txt")?;
    let mut reader = join_readers!(slice, bytes, f);
    let mut buf = String::new();
    reader.read_to_string(&mut buf)?;
    assert_eq!(buf.as_str(), "First-Second-Third");
    Ok(())
}

Trait Implementations

impl Read for BytesReader

fn read(&mut self, buf: &mut [u8]) -> Result<usize>

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

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

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

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Reads all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Reads the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

🔬This is a nightly-only experimental API. (read_buf)

Reads the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

where Self: Sized,

Creates an adapter which will read at most limit bytes from it.

impl Seek for BytesReader

fn seek(&mut self, pos: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

🔬This is a nightly-only experimental API. (seek_stream_len)

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

fn seek_relative(&mut self, offset: i64) -> Result<(), Error>

Seeks relative to the current position.