Struct VarInt 

pub struct VarInt(/* private fields */);

A QUIC variable-length integer (RFC 9000 Section 16).

Uses 2-bit prefix encoding:

• 00: 1 byte, values 0-63
• 01: 2 bytes, values 0-16383
• 10: 4 bytes, values 0-1073741823
• 11: 8 bytes, values 0-4611686018427387903

Implementations

impl VarInt

pub fn from_u64(v: u64) -> Result<Self, VarIntError>

Create a VarInt from a u64, returning an error if it exceeds the maximum.

pub fn into_inner(self) -> u64

Get the inner u64 value.

pub fn encoded_len(&self) -> usize

Return the number of bytes needed to encode this varint.

pub fn encode(&self, buf: &mut impl BufMut)

Encode this varint into the given buffer.

pub fn decode(buf: &mut impl Buf) -> Result<Self, VarIntError>

Decode a varint from the given buffer.

impl VarInt

pub fn from_u64_moqt(v: u64) -> Self

Create a VarInt from a u64 under the MoQT encoding, which reaches the full 64-bit range and so cannot fail.

pub fn encode_moqt<P: MoqtProfile>(&self, buf: &mut impl BufMut)

Encode using the MoQT variable-length integer (drafts 17 and later).

Draft-17 replaced the RFC 9000 encoding with one whose length comes from the number of leading 1 bits in the first byte: one byte carries 0-127, and nine bytes carry the full 64-bit range. The shortest form that holds the value is always used.

pub fn decode_moqt<P: MoqtProfile>( buf: &mut impl Buf, ) -> Result<Self, VarIntError>

Decode a MoQT variable-length integer (drafts 17 and later).

Non-minimal encodings are accepted, as draft-19 Section 1.4.1 requires: 0 may arrive as 0x00, 0x8000, 0xC00000 or any longer form. On a Moqt17 session a 7-byte encoding is VarIntError::InvalidCodePoint.

impl VarInt

pub fn from_usize(v: usize) -> Self

Create a VarInt from a usize. Infallible because practical memory sizes are always well below the 2^62 varint maximum.

Trait Implementations

impl Clone for VarInt

fn clone(&self) -> VarInt

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for VarInt

impl Debug for VarInt

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

Formats the value using the given formatter.

impl Eq for VarInt

impl From<VarInt> for u64

fn from(v: VarInt) -> u64

Converts to this type from the input type.

impl From<u32> for VarInt

fn from(v: u32) -> Self

Converts to this type from the input type.

impl Hash for VarInt

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

Feeds this value into the given Hasher.

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

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for VarInt

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

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

Restrict a value to a certain range.

impl PartialEq for VarInt

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for VarInt

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

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for VarInt

impl TryFrom<u64> for VarInt

type Error = VarIntError

The type returned in the event of a conversion error.

fn try_from(v: u64) -> Result<Self, Self::Error>

Performs the conversion.