Struct DbHeader 

pub struct DbHeader {
    pub magic: [u8; 4],
    pub version: u32,
    pub page_size: u32,
    pub schema_page: PageId,
    pub free_list_head: PageId,
    pub total_pages: u64,
    pub created_us: u64,
    pub modified_us: u64,
    pub checksum: u32,
}

Database header (stored on page 0)

Fields

magic: [u8; 4]

Magic bytes “TOON”

version: u32

Format version

page_size: u32

Page size in bytes

schema_page: PageId

Page ID of schema catalog root

free_list_head: PageId

First free page ID (head of free list)

total_pages: u64

Total number of allocated pages

created_us: u64

Database creation timestamp (microseconds)

modified_us: u64

Last modified timestamp (microseconds)

checksum: u32

Header checksum

Implementations

impl DbHeader

pub const SIZE: usize = 128

Size of header in bytes

pub fn new(page_size: u32) -> Self

Create a new database header

pub fn validate(&self) -> bool

Validate checksum

pub fn to_bytes(&self) -> [u8; 128]

Serialize to bytes

pub fn from_bytes(buf: &[u8]) -> Result<Self>

Deserialize from bytes

Trait Implementations

impl Clone for DbHeader

fn clone(&self) -> DbHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DbHeader

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DbHeader

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for DbHeader

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.