Enum CParameter 

#[non_exhaustive]
pub enum CParameter {
    WindowLog,
    HashLog,
    ChainLog,
    SearchLog,
    MinMatch,
    TargetLength,
    Strategy,
    EnableLongDistanceMatching,
    LdmHashLog,
    LdmMinMatch,
    LdmBucketSizeLog,
    LdmHashRateLog,
}

One tunable compression parameter — the analogue of a C zstd ZSTD_cParameter. Used to query bounds via CParameter::bounds.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

WindowLog

Maximum back-reference distance, log2. C ZSTD_c_windowLog.

HashLog

Match-finder hash table size, log2. C ZSTD_c_hashLog.

ChainLog

Match-finder chain table size, log2. C ZSTD_c_chainLog.

SearchLog

Number of search attempts, log2. C ZSTD_c_searchLog.

MinMatch

Minimum match length in bytes. C ZSTD_c_minMatch.

TargetLength

“Good enough” match length that ends the search. C ZSTD_c_targetLength.

Strategy

Match-finder Strategy (1..=9). C ZSTD_c_strategy.

EnableLongDistanceMatching

LDM enable flag (0/1). C ZSTD_c_enableLongDistanceMatching.

LdmHashLog

LDM hash table size, log2. C ZSTD_c_ldmHashLog.

LdmMinMatch

LDM minimum match length in bytes. C ZSTD_c_ldmMinMatch.

LdmBucketSizeLog

LDM bucket size, log2. C ZSTD_c_ldmBucketSizeLog.

LdmHashRateLog

LDM hash-insertion rate, log2. C ZSTD_c_ldmHashRateLog.

Implementations

impl CParameter

pub const fn bounds(self) -> Bounds

Inclusive value bounds for this parameter, mirroring ZSTD_cParam_getBounds. Window/hash/chain logs cap at 30 (the encoder’s match-finder ceiling) rather than the 31 C allows on 64-bit, because the back-reference history is indexed with u32 positions over a 2 * window eviction band.

Trait Implementations

impl Clone for CParameter

fn clone(&self) -> CParameter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CParameter

impl Debug for CParameter

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

Formats the value using the given formatter.

impl Eq for CParameter

impl PartialEq for CParameter

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for CParameter