Struct Header 

pub struct Header {
    pub magic: u32,
    pub version: u8,
    pub coder: u8,
    pub original_len: u64,
    pub crc32: u32,
}

Header structure for compressed data files.

Layout (18 bytes total):

• magic: 4 bytes (little-endian u32)
• version: 1 byte
• coder: 1 byte (0=AC, 1=rANS)
• original_len: 8 bytes (little-endian u64)
• crc32: 4 bytes (little-endian u32)

Fields

magic: u32

Magic number for format identification (must be MAGIC).

version: u8

Format version for compatibility checking.

coder: u8

Coder type used (0=AC, 1=rANS).

original_len: u64

Original uncompressed data length in bytes.

crc32: u32

CRC32 checksum of original data for integrity verification.

Implementations

impl Header

pub const SIZE: usize

Total header size in bytes.

pub fn new(coder: CoderType, original_len: u64, crc32: u32) -> Self

Create a new header for compressed data.

pub fn write<W: Write>(&self, w: &mut W) -> Result<()>

Serialize header to a writer (little-endian format).

pub fn read<R: Read>(r: &mut R) -> Result<Self>

Deserialize header from a reader (little-endian format).

pub fn coder_type(&self) -> CoderType

Get the coder type from the header byte.

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.