Struct CompressionParameters 

pub struct CompressionParameters {

    pub window_log: u32,
    pub chain_log: u32,
    pub hash_log: u32,
    pub search_log: u32,
    pub min_match: u32,
    pub target_length: u32,
    pub strategy: Strategy,
    pub enable_ldm: bool,
    pub ldm_hash_log: u32,
    pub ldm_min_match: u32,
    pub ldm_hash_rate_log: u32,
    pub nb_workers: u32,
    pub job_size: u32,
    pub overlap_log: u32,
}

libzstd ZSTD_compressionParameters for a level and size hint.

Fields

window_log: u32

windowLog (power of two window).

chain_log: u32

chainLog.

hash_log: u32

hashLog.

search_log: u32

searchLog (chain attempts = 2^searchLog).

min_match: u32

minMatch (3..=7).

target_length: u32

targetLength (fast skip / parser target).

strategy: Strategy

Strategy C would pick.

enable_ldm: bool

--zstd=enableLdm (also set by CLI --long / --rsyncable).

ldm_hash_log: u32

--zstd=ldmHashLog. 0 = default from windowLog.

ldm_min_match: u32

--zstd=ldmMinMatch. 0 = 64.

ldm_hash_rate_log: u32

--zstd=ldmHashRateLog. 0 = default from windowLog.

nb_workers: u32

--zstd=nbWorkers. 0 = leave unset (CLI -T / --single-thread win).

job_size: u32

--zstd=jobSize. 0 = default.

overlap_log: u32

--zstd=overlapLog. 0 = default by strategy.

Implementations

impl CompressionParameters

pub fn to_zstd_option_string(self) -> String

facebook/zstd --show-default-cparams / --zstd= line (no prefix).

pub fn apply_zstd_option_string(&mut self, spec: &str) -> Result<(), Error>

Apply a comma-separated --zstd=key=value,... spec (prefix optional).

pub fn ldm_params(self) -> LdmParams

LDM knobs parsed from --zstd= (CLI --long may still force enable).

pub fn apply_zstd_kv(&mut self, key: &str, value: i32) -> Result<(), Error>

Apply one --zstd=key=value assignment. Unknown keys are errors.

Trait Implementations

impl Clone for CompressionParameters

fn clone(&self) -> CompressionParameters

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CompressionParameters

impl Debug for CompressionParameters

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

Formats the value using the given formatter.

impl Eq for CompressionParameters

impl PartialEq for CompressionParameters

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CompressionParameters