Struct WalSectionHeader 

pub struct WalSectionHeader {
    pub start_offset: u64,
    pub end_offset: u64,
    pub is_full: bool,
    pub crc32: u32,
}

WAL section header for circular buffer bookkeeping.

Fields

start_offset: u64

Read pointer offset (inclusive), as a logical ring offset.

The serialized form stores a validity marker in the MSB, so the logical offset is masked with WalSectionHeader::OFFSET_MASK when persisted and decoded.

end_offset: u64

Write pointer offset (exclusive), as a logical ring offset.

is_full: bool

Whether the buffer is full (disambiguates start_offset == end_offset).

This is persisted by storing a flag in the MSB of the serialized end_offset. Therefore, the ring length must stay within WalSectionHeader::OFFSET_MASK.

crc32: u32

CRC32 for bytes [0..16).

Implementations

impl WalSectionHeader

pub fn new(start_offset: u64, end_offset: u64, is_full: bool) -> Self

Create a new section header with computed CRC.

pub fn to_bytes(&self) -> [u8; 20]

Serialize to 20 bytes (start/end offsets + CRC32).

pub fn from_bytes(bytes: &[u8; 20]) -> Result<Self>

Deserialize from 20 bytes and validate CRC32.

Trait Implementations

impl Clone for WalSectionHeader

fn clone(&self) -> WalSectionHeader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WalSectionHeader

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

Formats the value using the given formatter.

impl Eq for WalSectionHeader

impl PartialEq for WalSectionHeader

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for WalSectionHeader