Struct CompressionLevel 

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

A validated Zstandard compression level.

Positive levels 1 through 22 select progressively stronger compression. Negative levels select the Zstandard fast strategy, with the absolute value controlling the acceleration step.

Implementations

impl CompressionLevel

pub const UNCOMPRESSED: Self

Emit raw blocks without compression.

pub const FASTEST: Self

Fast compression, corresponding to level 1.

pub const DEFAULT: Self

The recommended default, corresponding to level 3.

pub const BETTER: Self

A stronger general-purpose setting, corresponding to level 7.

pub const BEST: Self

The historical ruzstd “best” profile, corresponding to level 11.

pub const MAXIMUM: Self

The strongest supported standard level.

pub const Uncompressed: Self = Self::UNCOMPRESSED

pub const Fastest: Self = Self::FASTEST

pub const Default: Self = Self::DEFAULT

pub const Better: Self = Self::BETTER

pub const Best: Self = Self::BEST

pub const MAX_FAST_ACCELERATION: u32

Largest supported fast-strategy acceleration step.

pub const fn new(level: u8) -> Result<Self, InvalidCompressionLevel>

Creates a precise positive compression level.

pub const fn fast(acceleration: u32) -> Result<Self, InvalidCompressionLevel>

Returns the numeric level used by the compressor parameter table. Creates a fast level with an explicit match-search acceleration step.

pub const fn get(self) -> i32

Returns the standard numeric level. Negative values are fast levels.

Trait Implementations

impl Clone for CompressionLevel

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CompressionLevel

impl Debug for CompressionLevel

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

Formats the value using the given formatter.

impl Default for CompressionLevel

fn default() -> Self

Returns the “default value” for a type.

impl Eq for CompressionLevel

impl From<CompressionLevel> for i32

fn from(level: CompressionLevel) -> Self

Converts to this type from the input type.

impl Hash for CompressionLevel

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 CompressionLevel

fn cmp(&self, other: &Self) -> 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 CompressionLevel

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for CompressionLevel

fn partial_cmp(&self, other: &Self) -> 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 CompressionLevel

impl TryFrom<i32> for CompressionLevel

type Error = InvalidCompressionLevel

The type returned in the event of a conversion error.

fn try_from(level: i32) -> Result<Self, Self::Error>

Performs the conversion.