Enum Filter

pub enum Filter {
    ByteShuffle,
    BitShuffle,
    Delta,
    TruncPrecision {
        prec_bits: i8,
    },
}

Filters that can be applied to the data before compression.

Variants

ByteShuffle

Byte shuffle filter.

Given an array of bytes, representing N elements of a type with S bytes, the filter rearrange the bytes from [1_1, 1_2, ..., 1_S, 2_1, 2_2, ..., 2_S, ..., N_1, N_2, ..., N_S] to [1_1, 2_1, ..., N_1, 1_2, 2_2, ..., N_2, ..., 1_S, 2_S, ..., N_S], where i_j is the j-th byte of the i-th element.

BitShuffle

Bit shuffle filter.

Similar to ByteShuffle, but operates on bits instead of bytes.

Delta

Delta filter.

This filter encodes the data as differences between consecutive elements.

TruncPrecision

Truncation precision filter for floating point data.

This filter reduces the precision of floating point numbers by truncating the least significant bits.

This filter is only supported for floating point types (e.g., f32, f64). This can not be enforced by the library, there it is only checked that the typesize is 4 or 8 bytes.

Fields

prec_bits: i8

The number of bits to truncate.

Positive value will set absolute precision bits, whereas negative value will reduce the precision bits (similar to Python slicing convention).

Trait Implementations

impl Clone for Filter

fn clone(&self) -> Filter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Filter

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

Formats the value using the given formatter.

impl Hash for Filter

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 PartialEq for Filter

fn eq(&self, other: &Filter) -> 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 Eq for Filter

impl StructuralPartialEq for Filter