Struct Reader

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pub struct Reader<'a, R: ReadBytes<'a>>(/* private fields */);
Expand description

A convenience structure used for counting the number of bytes read.

This structure wraps an implementation of ReadBytes. It forwards read operations to the inner type while also maintaining a count of the number of bytes that pass through it.

When you have finished with it, you can return the original type via the into_inner method.

When compiled with the std feature this structure implements Read.

§Examples

use byteio::{ReadBytes, ReadBytesExt, Reader};

fn main() -> byteio::Result<()> {
    let buf: &[u8] = &[1, 0, 2, 0, 0, 0, 3];

    let mut reader = Reader::new(buf);

    assert_eq!(reader.try_read_u8()?, 1);
    assert_eq!(reader.try_read_u16_be()?, 2);
    assert_eq!(reader.try_read_u32_be()?, 3);

    assert_eq!(reader.num_bytes_read(), 7);

    let inner = reader.into_inner();
    assert!(inner.is_empty());

    Ok(())
}

Implementations§

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impl<'a, R: ReadBytes<'a>> Reader<'a, R>

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pub fn new(reader: R) -> Self

Creates a new Reader by wrapping a ReadBytes implementor.

§Examples
use byteio::Reader;

let buf = [0_u8; 2];
let mut reader = Reader::new(&buf[..]);
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pub fn num_bytes_read(&self) -> usize

Retrieves the number of bytes that have been read by this Reader.

§Examples
use byteio::{ReadBytes, Reader};

let buf = [0_u8; 2];
let mut reader = Reader::new(&buf[..]);
let _ = reader.read_exact(1);
let _ = reader.read_exact(1);

assert_eq!(reader.num_bytes_read(), 2);
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pub fn into_inner(self) -> R

Consumes this Reader and returns the original ReadBytes implementor.

§Examples
use byteio::{ReadBytes, Reader};

let buf = [0_u8; 2];
let mut reader = Reader::new(&buf[..]);
let _ = reader.read_exact(1);
let inner = reader.into_inner();

assert_eq!(inner.len(), 1); // the reader consumed one byte from its view of the slice

Trait Implementations§

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impl<'a, R: ReadBytes<'a>> AsRef<[u8]> for Reader<'a, R>

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

Converts this type into a shared reference of the (usually inferred) input type.
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impl<'a, R: Clone + ReadBytes<'a>> Clone for Reader<'a, R>

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fn clone(&self) -> Reader<'a, R>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<'a, R: Debug + ReadBytes<'a>> Debug for Reader<'a, R>

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

Formats the value using the given formatter. Read more
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impl<'a, R: PartialEq + ReadBytes<'a>> PartialEq for Reader<'a, R>

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fn eq(&self, other: &Reader<'a, R>) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl<'a, R: ReadBytes<'a>> Read for Reader<'a, R>

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

Like read, except that it reads into a slice of buffers. Read more
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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. Read more
1.0.0 · Source§

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

Reads all bytes until EOF in this source, appending them to buf. Read more
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fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Reads the exact number of bytes required to fill buf. Read more
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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. Read more
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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. Read more
1.0.0 · Source§

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

Creates a “by reference” adaptor for this instance of Read. Read more
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fn bytes(self) -> Bytes<Self>
where Self: Sized,

Transforms this Read instance to an Iterator over its bytes. Read more
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fn chain<R>(self, next: R) -> Chain<Self, R>
where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another. Read more
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fn take(self, limit: u64) -> Take<Self>
where Self: Sized,

Creates an adapter which will read at most limit bytes from it. Read more
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impl<'a, R: ReadBytes<'a>> ReadBytes<'a> for Reader<'a, R>

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fn read_exact(&mut self, n: usize) -> &'a [u8]

Forcibly attempts to read exactly n bytes from the buffer. Read more
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fn try_read_exact(&mut self, n: usize) -> Result<&'a [u8]>

Attempts to read exactly n bytes from the buffer. Read more
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impl<'a, R: Eq + ReadBytes<'a>> Eq for Reader<'a, R>

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impl<'a, R: ReadBytes<'a>> StructuralPartialEq for Reader<'a, R>

Auto Trait Implementations§

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impl<'a, R> Freeze for Reader<'a, R>
where R: Freeze,

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impl<'a, R> RefUnwindSafe for Reader<'a, R>
where R: RefUnwindSafe,

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impl<'a, R> Send for Reader<'a, R>
where R: Send,

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impl<'a, R> Sync for Reader<'a, R>
where R: Sync,

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impl<'a, R> Unpin for Reader<'a, R>
where R: Unpin,

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impl<'a, R> UnwindSafe for Reader<'a, R>
where R: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<'a, R> ReadBytesExt<'a> for R
where R: ReadBytes<'a>,

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fn read_u8(&mut self) -> u8

Reads a u8 from the underlying buffer. Read more
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fn try_read_u8(&mut self) -> Result<u8>

Attempts to read a u8 from the underlying buffer. Read more
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fn read_i8(&mut self) -> i8

Reads an i8 from the underlying buffer. Read more
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fn try_read_i8(&mut self) -> Result<i8>

Attempts to read an i8 from the underlying buffer. Read more
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fn read_u16_le(&mut self) -> u16

Reads a little endian u16 from the underlying buffer. Read more
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fn read_u16_be(&mut self) -> u16

Reads a big endian u16 from the underlying buffer. Read more
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fn try_read_u16_le(&mut self) -> Result<u16>

Attempts to read a little endian u16 from the underlying buffer. Read more
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fn try_read_u16_be(&mut self) -> Result<u16>

Attempts to read a big endian u16 from the underlying buffer. Read more
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fn read_i16_le(&mut self) -> i16

Reads a little endian i16 from the underlying buffer. Read more
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fn read_i16_be(&mut self) -> i16

Reads a big endian i16 from the underlying buffer. Read more
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fn try_read_i16_le(&mut self) -> Result<i16>

Attempts to read a little endian i16 from the underlying buffer. Read more
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fn try_read_i16_be(&mut self) -> Result<i16>

Attempts to read a little endian i16 from the underlying buffer. Read more
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fn read_u32_le(&mut self) -> u32

Reads a little endian u32 from the underlying buffer. Read more
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fn read_u32_be(&mut self) -> u32

Reads a big endian u32 from the underlying buffer. Read more
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fn try_read_u32_le(&mut self) -> Result<u32>

Attempts to read a little endian u32 from the underlying buffer. Read more
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fn try_read_u32_be(&mut self) -> Result<u32>

Attempts to read a big endian u32 from the underlying buffer. Read more
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fn read_i32_le(&mut self) -> i32

Reads a little endian i32 from the underlying buffer. Read more
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fn read_i32_be(&mut self) -> i32

Reads a big endian i32 from the underlying buffer. Read more
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fn try_read_i32_le(&mut self) -> Result<i32>

Attempts to read a little endian i32 from the underlying buffer. Read more
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fn try_read_i32_be(&mut self) -> Result<i32>

Attempts to read a big endian i32 from the underlying buffer. Read more
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fn read_u64_le(&mut self) -> u64

Reads a little endian u64 from the underlying buffer. Read more
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fn read_u64_be(&mut self) -> u64

Reads a big endian u64 from the underlying buffer. Read more
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fn try_read_u64_le(&mut self) -> Result<u64>

Attempts to read a little endian u64 from the underlying buffer. Read more
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fn try_read_u64_be(&mut self) -> Result<u64>

Attempts to read a big endian u64 from the underlying buffer. Read more
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fn read_i64_le(&mut self) -> i64

Reads a little endian i64 from the underlying buffer. Read more
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fn read_i64_be(&mut self) -> i64

Reads a big endian i64 from the underlying buffer. Read more
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fn try_read_i64_le(&mut self) -> Result<i64>

Attempts to read a little endian i64 from the underlying buffer. Read more
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fn try_read_i64_be(&mut self) -> Result<i64>

Attempts to read a big endian i64 from the underlying buffer. Read more
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fn read_u128_le(&mut self) -> u128

Reads a little endian u128 from the underlying buffer. Read more
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fn read_u128_be(&mut self) -> u128

Reads a big endian u128 from the underlying buffer. Read more
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fn try_read_u128_le(&mut self) -> Result<u128>

Attempts to read a little endian u128 from the underlying buffer. Read more
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fn try_read_u128_be(&mut self) -> Result<u128>

Attempts to read a big endian u128 from the underlying buffer. Read more
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fn read_i128_le(&mut self) -> i128

Reads a little endian i128 from the underlying buffer. Read more
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fn read_i128_be(&mut self) -> i128

Reads a big endian i128 from the underlying buffer. Read more
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fn try_read_i128_le(&mut self) -> Result<i128>

Attempts to read a little endian i128 from the underlying buffer. Read more
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fn try_read_i128_be(&mut self) -> Result<i128>

Attempts to read a big endian i128 from the underlying buffer. Read more
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fn read_f32_le(&mut self) -> f32

Reads a little endian IEEE754 f32 from the underlying buffer. Read more
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fn read_f32_be(&mut self) -> f32

Reads a big endian IEEE754 f32 from the underlying buffer. Read more
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fn try_read_f32_le(&mut self) -> Result<f32>

Attempts to read a little endian IEEE754 f32 from the underlying buffer. Read more
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fn try_read_f32_be(&mut self) -> Result<f32>

Attempts to read a big endian IEEE754 f32 from the underlying buffer. Read more
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fn read_f64_le(&mut self) -> f64

Reads a little endian IEEE754 f64 from the underlying buffer. Read more
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fn read_f64_be(&mut self) -> f64

Reads a big endian IEEE754 f64 from the underlying buffer. Read more
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fn try_read_f64_le(&mut self) -> Result<f64>

Attempts to read a little endian IEEE754 f64 from the underlying buffer. Read more
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fn try_read_f64_be(&mut self) -> Result<f64>

Attempts to read a big endian IEEE754 f64 from the underlying buffer. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.