Struct Header 

pub struct Header {

    pub page_size: u32,
    pub reserved_space: u8,
    pub wal_mode: bool,
    pub file_change_counter: u32,
    pub header_page_count: Option<u32>,
    pub first_freelist_trunk: u32,
    pub freelist_page_count: u32,
    pub schema_cookie: u32,
    pub schema_format: u32,
    pub text_encoding: TextEncoding,
    pub user_version: i32,
    pub application_id: i32,
    pub largest_root_page: u32,
    pub sqlite_version_number: u32,
}

Fields

page_size: u32

Bytes per page, 512 to 65536, always a power of two.

reserved_space: u8

Unused bytes at the end of every page. Usually zero; extensions use it for per page trailers.

wal_mode: bool

Whether the database uses a write-ahead log. On its own this says nothing about whether the main file is complete: see the note at the top of this file.

file_change_counter: u32

header_page_count: Option<u32>

Page count as stated in the header, only present when the header says it is current. Callers should prefer Reader::page_count.

first_freelist_trunk: u32

freelist_page_count: u32

schema_cookie: u32

schema_format: u32

1 to 4. Format 4 is what any SQLite since 2006 writes.

text_encoding: TextEncoding

user_version: i32

application_id: i32

largest_root_page: u32

Non zero when the database is in auto vacuum mode, in which case pointer map pages are interleaved with the data.

sqlite_version_number: u32

Implementations

impl Header

pub fn usable_size(&self) -> u32

Bytes of each page the b-tree layer may use. Everything in the file that indexes into a page is bounded by this, not by the page size.

pub fn parse(bytes: &[u8]) -> Result<Header>

Trait Implementations

impl Clone for Header

fn clone(&self) -> Self

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 Eq for Header

impl PartialEq for Header

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Header