Struct FrameHeader 

pub(super) struct FrameHeader {
    pub(super) crc: u32,
    pub(super) len: u64,
}

Available on crate feature alloc only.

12-byte journal frame header: crc32_be(4) || length_be(8).

The CRC covers length_be || payload. The length is a u64, so it can address any payload a slice can hold (usize is at most 64 bits), and no frame can ever overflow its length field.

Fields

crc: u32

len: u64

Implementations

impl FrameHeader

pub(super) const LEN: usize = 12usize

pub(super) fn build(payload: &[u8]) -> Self

Builds a header for the given payload by computing its CRC.

pub(super) fn decode(bytes: &[u8]) -> Self

Decodes a LEN-byte header. Caller must ensure bytes.len() == LEN.

pub(super) fn verify_with_crc(expected_crc: u32, payload: &[u8]) -> bool

Returns true if the payload’s CRC matches expected_crc.

pub(super) fn encode_to_vec(&self, buf: &mut Vec<u8>)