Enum zstd::stream::raw::CParameter

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#[non_exhaustive]
pub enum CParameter {
Show 20 variants TargetCBlockSize(u32), CompressionLevel(i32), WindowLog(u32), HashLog(u32), ChainLog(u32), SearchLog(u32), MinMatch(u32), TargetLength(u32), Strategy(ZSTD_strategy), EnableLongDistanceMatching(bool), LdmHashLog(u32), LdmMinMatch(u32), LdmBucketSizeLog(u32), LdmHashRateLog(u32), ContentSizeFlag(bool), ChecksumFlag(bool), DictIdFlag(bool), NbWorkers(u32), JobSize(u32), OverlapSizeLog(u32),
}
Expand description

A compression parameter.

Variants (Non-exhaustive)§

This enum is marked as 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.
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TargetCBlockSize(u32)

Target CBlock size.

Tries to make compressed blocks fit in this size (not a guarantee, just a target). Useful to reduce end-to-end latency in low-bandwidth environments.

No target when the value is 0.

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CompressionLevel(i32)

Compression level to use.

Compression levels are global presets for the other compression parameters.

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WindowLog(u32)

Maximum allowed back-reference distance.

The actual distance is 2 power “this value”.

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HashLog(u32)

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ChainLog(u32)

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SearchLog(u32)

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MinMatch(u32)

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TargetLength(u32)

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Strategy(ZSTD_strategy)

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EnableLongDistanceMatching(bool)

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LdmHashLog(u32)

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LdmMinMatch(u32)

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LdmBucketSizeLog(u32)

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LdmHashRateLog(u32)

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ContentSizeFlag(bool)

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ChecksumFlag(bool)

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DictIdFlag(bool)

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NbWorkers(u32)

How many threads will be spawned.

With a default value of 0, compress_stream* functions block until they complete.

With any other value (including 1, a single compressing thread), these methods directly return, and the actual compression is done in the background (until a flush is requested).

Note: this will only work if the zstdmt feature is activated.

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JobSize(u32)

Size in bytes of a compression job.

Does not have any effect when NbWorkers is set to 0.

The default value of 0 finds the best job size based on the compression parameters.

Note: this will only work if the zstdmt feature is activated.

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OverlapSizeLog(u32)

Specifies how much overlap must be given to each worker.

Possible values:

  • 0 (default value): automatic overlap based on compression strategy.
  • 1: No overlap
  • 1 < n < 9: Overlap a fraction of the window size, defined as 1/(2 ^ 9-n).
  • 9: Full overlap (as long as the window)
  • 9 < m: Will return an error.

Note: this will only work if the zstdmt feature is activated.

Trait Implementations§

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impl Clone for CParameter

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fn clone(&self) -> CParameter

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 CParameter

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

Formats the value using the given formatter. Read more
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impl PartialEq for CParameter

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

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impl Eq for CParameter

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impl StructuralPartialEq for CParameter

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: Copy,

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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> 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.