Struct Sequence

pub struct Sequence {
    pub ll: u32,
    pub ml: u32,
    pub of: u32,
}

A sequence represents potentially redundant data, and it can be broken up into 2 steps:

• A copy step, where data is copied from the literals section to the decompressed output
• A match copy step that copies data from within the previously decompressed output.

https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#sequence-execution

Fields

ll: u32

Literal length, or the number of bytes to be copied from the literals section in the copy step.

ml: u32

The length of the match to make during the match copy step.

of: u32

How far back to go in the decompressed data to read from the match copy step. If this value is greater than 3, then the offset is of -3. If of is from 1-3, then it has special handling:

The first 3 values define 3 different repeated offsets, with 1 referring to the most recent, 2 the second recent, and so on. When the current sequence has a literal length of 0, then the repeated offsets are shifted by 1. So an offset value of 1 refers to 2, 2 refers to 3, and 3 refers to the most recent offset minus one. If that value is equal to zero, the data is considered corrupted.

Trait Implementations

impl Clone for Sequence

fn clone(&self) -> Sequence

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Display for Sequence

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

Formats the value using the given formatter.

impl Copy for Sequence