Struct Header 

pub struct Header {

    pub magic: [u8; 4],
    pub format_version: u8,
    pub engine_kind: u8,
    pub flags: u16,
    pub entry_count: u32,
    pub string_pool_offset: u32,
    pub string_pool_size: u32,
    pub entry_table_offset: u32,
    pub fst_code_index_offset: u32,
    pub fst_code_index_size: u32,
    pub fst_word_index_offset: u32,
    pub fst_word_index_size: u32,
    pub bigram_offset: u32,
    pub bigram_size: u32,
    pub embedding_offset: u32,
    pub embedding_dim: u16,
    pub embedding_dtype: u8,
    pub reserved: u8,
    pub sha256_of_payload: [u8; 32],
}

Header, mirrors the on-disk 64-byte layout exactly. All integer fields are little-endian on disk; the public struct holds host-byte values (decoded on parse, encoded on to_bytes).

Fields

magic: [u8; 4]

format_version: u8

engine_kind: u8

flags: u16

entry_count: u32

string_pool_offset: u32

string_pool_size: u32

entry_table_offset: u32

fst_code_index_offset: u32

fst_code_index_size: u32

fst_word_index_offset: u32

fst_word_index_size: u32

bigram_offset: u32

bigram_size: u32

embedding_offset: u32

embedding_dim: u16

embedding_dtype: u8

reserved: u8

sha256_of_payload: [u8; 32]

Implementations

impl Header

pub fn to_bytes(&self) -> [u8; 64]

Encode the header into a fixed 64-byte buffer (little-endian).

pub fn parse(buf: &[u8]) -> Option<Self>

Decode a header from on-disk bytes. Returns None if buf is too small or the magic does not match.

Trait Implementations

impl Clone for Header

fn clone(&self) -> Header

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Header

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

Formats the value using the given formatter.

impl PartialEq for Header

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

impl Eq for Header

impl StructuralPartialEq for Header