Struct bytes::buf::Take

[+] Show declaration

pub struct Take<T> { /* fields omitted */ }

[−] Expand description

A Buf adapter which limits the bytes read from an underlying buffer.

This struct is generally created by calling take() on Buf. See documentation of take() for more details.

Methods

impl<T> Take<T>

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pub fn into_inner(self) -> T

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Consumes this Take, returning the underlying value.

Examples

use bytes::{Buf, BufMut};
use std::io::Cursor;

let mut buf = Cursor::new(b"hello world").take(2);
let mut dst = vec![];

dst.put(&mut buf);
assert_eq!(*dst, b"he"[..]);

let mut buf = buf.into_inner();

dst.clear();
dst.put(&mut buf);
assert_eq!(*dst, b"llo world"[..]);

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_ref(&self) -> &T

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Gets a reference to the underlying Buf.

It is inadvisable to directly read from the underlying Buf.

Examples

use bytes::{Buf, BufMut};
use std::io::Cursor;

let mut buf = Cursor::new(b"hello world").take(2);

assert_eq!(0, buf.get_ref().position());

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

pub fn get_mut(&mut self) -> &mut T

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Gets a mutable reference to the underlying Buf.

It is inadvisable to directly read from the underlying Buf.

Examples

use bytes::{Buf, BufMut};
use std::io::Cursor;

let mut buf = Cursor::new(b"hello world").take(2);
let mut dst = vec![];

buf.get_mut().set_position(2);

dst.put(&mut buf);
assert_eq!(*dst, b"ll"[..]);

pub fn limit(&self) -> usize

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Returns the maximum number of bytes that can be read.

Note

If the inner Buf has fewer bytes than indicated by this method then that is the actual number of available bytes.

Examples

use bytes::Buf;
use std::io::Cursor;

let mut buf = Cursor::new(b"hello world").take(2);

assert_eq!(2, buf.limit());
assert_eq!(b'h', buf.get_u8());
assert_eq!(1, buf.limit());

pub fn set_limit(&mut self, lim: usize)

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Sets the maximum number of bytes that can be read.

Note

If the inner Buf has fewer bytes than lim then that is the actual number of available bytes.

Examples

use bytes::{Buf, BufMut};
use std::io::Cursor;

let mut buf = Cursor::new(b"hello world").take(2);
let mut dst = vec![];

dst.put(&mut buf);
assert_eq!(*dst, b"he"[..]);

dst.clear();

buf.set_limit(3);
dst.put(&mut buf);
assert_eq!(*dst, b"llo"[..]);

Trait Implementations

impl<T: Debug> Debug for Take<T>

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fn fmt(&self, f: &mut Formatter) -> Result

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Formats the value using the given formatter.

impl<T: Buf> Buf for Take<T>

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fn remaining(&self) -> usize

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Returns the number of bytes between the current position and the end of the buffer.

Important traits for &'a [u8]

impl<'a> Read for &'a [u8]impl<'a> Write for &'a mut [u8]

fn bytes(&self) -> &[u8]

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Returns a slice starting at the current position and of length between 0 and Buf::remaining().

fn advance(&mut self, cnt: usize)

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Advance the internal cursor of the Buf

fn bytes_vec<'a>(&'a self, dst: &mut [&'a IoVec]) -> usize

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Fills dst with potentially multiple slices starting at self's current position.

fn has_remaining(&self) -> bool

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Returns true if there are any more bytes to consume

fn copy_to_slice(&mut self, dst: &mut [u8])

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Copies bytes from self into dst.

fn get_u8(&mut self) -> u8

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Gets an unsigned 8 bit integer from self.

fn get_i8(&mut self) -> i8

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Gets a signed 8 bit integer from self.

fn get_u16_be(&mut self) -> u16

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Gets an unsigned 16 bit integer from self in big-endian byte order.

fn get_u16_le(&mut self) -> u16

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Gets an unsigned 16 bit integer from self in little-endian byte order.

fn get_i16_be(&mut self) -> i16

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Gets a signed 16 bit integer from self in big-endian byte order.

fn get_i16_le(&mut self) -> i16

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Gets a signed 16 bit integer from self in little-endian byte order.

fn get_u32_be(&mut self) -> u32

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Gets an unsigned 32 bit integer from self in the big-endian byte order.

fn get_u32_le(&mut self) -> u32

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Gets an unsigned 32 bit integer from self in the little-endian byte order.

fn get_i32_be(&mut self) -> i32

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Gets a signed 32 bit integer from self in big-endian byte order.

fn get_i32_le(&mut self) -> i32

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Gets a signed 32 bit integer from self in little-endian byte order.

fn get_u64_be(&mut self) -> u64

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Gets an unsigned 64 bit integer from self in big-endian byte order.

fn get_u64_le(&mut self) -> u64

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Gets an unsigned 64 bit integer from self in little-endian byte order.

fn get_i64_be(&mut self) -> i64

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Gets a signed 64 bit integer from self in big-endian byte order.

fn get_i64_le(&mut self) -> i64

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Gets a signed 64 bit integer from self in little-endian byte order.

fn get_uint_be(&mut self, nbytes: usize) -> u64

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Gets an unsigned n-byte integer from self in big-endian byte order.

fn get_uint_le(&mut self, nbytes: usize) -> u64

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Gets an unsigned n-byte integer from self in little-endian byte order.

fn get_int_be(&mut self, nbytes: usize) -> i64

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Gets a signed n-byte integer from self in big-endian byte order.

fn get_int_le(&mut self, nbytes: usize) -> i64

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Gets a signed n-byte integer from self in little-endian byte order.

fn get_f32_be(&mut self) -> f32

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Gets an IEEE754 single-precision (4 bytes) floating point number from self in big-endian byte order.

fn get_f32_le(&mut self) -> f32

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Gets an IEEE754 single-precision (4 bytes) floating point number from self in little-endian byte order.

fn get_f64_be(&mut self) -> f64

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Gets an IEEE754 double-precision (8 bytes) floating point number from self in big-endian byte order.

fn get_f64_le(&mut self) -> f64

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Gets an IEEE754 double-precision (8 bytes) floating point number from self in little-endian byte order.

fn collect<B>(self) -> B where     Self: Sized,     B: FromBuf,

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Transforms a Buf into a concrete buffer.

fn take(self, limit: usize) -> Take<Self> where     Self: Sized,

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Creates an adaptor which will read at most limit bytes from self.

fn chain<U>(self, next: U) -> Chain<Self, U::Buf> where     U: IntoBuf,     Self: Sized,

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Creates an adaptor which will chain this buffer with another.

Important traits for &'a mut R

impl<'a, R> Read for &'a mut R where
    R: Read + ?Sized, impl<'a, W> Write for &'a mut W where
    W: Write + ?Sized, impl<'a, I> Iterator for &'a mut I where
    I: Iterator + ?Sized,  type Item = <I as Iterator>::Item;

fn by_ref(&mut self) -> &mut Self where     Self: Sized,

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Creates a "by reference" adaptor for this instance of Buf.

Important traits for Reader<B>

impl<B: Buf + Sized> Read for Reader<B>

fn reader(self) -> Reader<Self> where     Self: Sized,

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Creates an adaptor which implements the Read trait for self.

Important traits for Iter<T>

impl<T: Buf> Iterator for Iter<T> type Item = u8;

fn iter(self) -> Iter<Self> where     Self: Sized,

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Returns an iterator over the bytes contained by the buffer.