Struct tokio_util::codec::AnyDelimiterCodec

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pub struct AnyDelimiterCodec { /* private fields */ }
Expand description

A simple Decoder and Encoder implementation that splits up data into chunks based on any character in the given delimiter string.

§Example

Decode string of bytes containing various different delimiters.

use tokio_util::codec::{AnyDelimiterCodec, Decoder};
use bytes::{BufMut, BytesMut};

let mut codec = AnyDelimiterCodec::new(b",;\r\n".to_vec(),b";".to_vec());
let buf = &mut BytesMut::new();
buf.reserve(200);
buf.put_slice(b"chunk 1,chunk 2;chunk 3\n\r");
assert_eq!("chunk 1", codec.decode(buf).unwrap().unwrap());
assert_eq!("chunk 2", codec.decode(buf).unwrap().unwrap());
assert_eq!("chunk 3", codec.decode(buf).unwrap().unwrap());
assert_eq!("", codec.decode(buf).unwrap().unwrap());
assert_eq!(None, codec.decode(buf).unwrap());

Implementations§

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impl AnyDelimiterCodec

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pub fn new( seek_delimiters: Vec<u8>, sequence_writer: Vec<u8>, ) -> AnyDelimiterCodec

Returns a AnyDelimiterCodec for splitting up data into chunks.

§Note

The returned AnyDelimiterCodec will not have an upper bound on the length of a buffered chunk. See the documentation for new_with_max_length for information on why this could be a potential security risk.

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pub fn new_with_max_length( seek_delimiters: Vec<u8>, sequence_writer: Vec<u8>, max_length: usize, ) -> Self

Returns a AnyDelimiterCodec with a maximum chunk length limit.

If this is set, calls to AnyDelimiterCodec::decode will return a AnyDelimiterCodecError when a chunk exceeds the length limit. Subsequent calls will discard up to limit bytes from that chunk until a delimiter character is reached, returning None until the delimiter over the limit has been fully discarded. After that point, calls to decode will function as normal.

§Note

Setting a length limit is highly recommended for any AnyDelimiterCodec which will be exposed to untrusted input. Otherwise, the size of the buffer that holds the chunk currently being read is unbounded. An attacker could exploit this unbounded buffer by sending an unbounded amount of input without any delimiter characters, causing unbounded memory consumption.

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pub fn max_length(&self) -> usize

Returns the maximum chunk length when decoding.

use std::usize;
use tokio_util::codec::AnyDelimiterCodec;

let codec = AnyDelimiterCodec::new(b",;\n".to_vec(), b";".to_vec());
assert_eq!(codec.max_length(), usize::MAX);
use tokio_util::codec::AnyDelimiterCodec;

let codec = AnyDelimiterCodec::new_with_max_length(b",;\n".to_vec(), b";".to_vec(), 256);
assert_eq!(codec.max_length(), 256);

Trait Implementations§

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impl Clone for AnyDelimiterCodec

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fn clone(&self) -> AnyDelimiterCodec

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 Debug for AnyDelimiterCodec

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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 Decoder for AnyDelimiterCodec

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type Item = Bytes

The type of decoded frames.
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type Error = AnyDelimiterCodecError

The type of unrecoverable frame decoding errors. Read more
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fn decode( &mut self, buf: &mut BytesMut, ) -> Result<Option<Bytes>, AnyDelimiterCodecError>

Attempts to decode a frame from the provided buffer of bytes. Read more
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fn decode_eof( &mut self, buf: &mut BytesMut, ) -> Result<Option<Bytes>, AnyDelimiterCodecError>

A default method available to be called when there are no more bytes available to be read from the underlying I/O. Read more
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fn framed<T: AsyncRead + AsyncWrite + Sized>(self, io: T) -> Framed<T, Self>
where Self: Sized,

Provides a Stream and Sink interface for reading and writing to this Io object, using Decode and Encode to read and write the raw data. Read more
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impl Default for AnyDelimiterCodec

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl<T> Encoder<T> for AnyDelimiterCodec
where T: AsRef<str>,

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type Error = AnyDelimiterCodecError

The type of encoding errors. Read more
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fn encode( &mut self, chunk: T, buf: &mut BytesMut, ) -> Result<(), AnyDelimiterCodecError>

Encodes a frame into the buffer provided. Read more
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impl Hash for AnyDelimiterCodec

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
1.3.0 · source§

fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for AnyDelimiterCodec

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fn cmp(&self, other: &AnyDelimiterCodec) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for AnyDelimiterCodec

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fn eq(&self, other: &AnyDelimiterCodec) -> bool

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for AnyDelimiterCodec

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fn partial_cmp(&self, other: &AnyDelimiterCodec) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Eq for AnyDelimiterCodec

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impl StructuralPartialEq for AnyDelimiterCodec

Auto Trait Implementations§

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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default unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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<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.