Struct Chain

pub struct Chain<R1: Read, R2: Read> { /* private fields */ }

Adapter to chain two readers together.

It might seem the exact same as std::io::Chain but it is not. The difference is that when it reaches the end of the first reader, it fills the rest of the buffer with the first bytes from the second reader, what std::io::Chain doesn’t do.

Implementations

impl<R1: Read, R2: Read> Chain<R1, R2>

pub fn new(first: R1, second: R2) -> Self

Create a Chain from the two given readers.

Trait Implementations

impl<R1: Read, R2: Read> Read for Chain<R1, R2>

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.

Example:

use std::io::Read;
use fencryption_lib::io::Chain;

let text = "Never gonna give you up ! Never gonna let you down !";
let mut source = Chain::new([255u8; 41].as_ref(), text.as_bytes());

let mut buf = vec![0u8; 16];
loop {
    let read_len = source.read(&mut buf).unwrap();
    println!("{:x?} {}", &buf[..read_len], read_len);
    if read_len != buf.len() {
        break;
    }
}

Output:

[ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff] 16
[ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff, ff] 16
[ff, ff, ff, ff, ff, ff, ff, ff, ff, 4e, 65, 76, 65, 72, 20, 67] 16
[6f, 6e, 6e, 61, 20, 67, 69, 76, 65, 20, 79, 6f, 75, 20, 75, 70] 16
[20, 21, 20, 4e, 65, 76, 65, 72, 20, 67, 6f, 6e, 6e, 61, 20, 6c] 16
[65, 74, 20, 79, 6f, 75, 20, 64, 6f, 77, 6e, 20, 21] 13

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.