Struct Header 

pub struct Header {
    pub version: (u8, u8),
    pub dataset_type: DatasetType,
    pub metadata_size: u32,
    pub payload_size: u32,
    pub uncompressed_size: u32,
    pub compression: Compression,
    pub flags: u8,
    pub schema_size: u16,
    pub num_rows: u64,
}

File header (32 bytes, fixed)

Offset	Size	Field
0	4	magic
4	2	format_version (major.minor)
6	2	dataset_type
8	4	metadata_size
12	4	payload_size (compressed)
16	4	uncompressed_size
20	1	compression
21	1	flags
22	2	schema_size
24	8	num_rows

Fields

version: (u8, u8)

Format version (major, minor)

dataset_type: DatasetType

Dataset type identifier

metadata_size: u32

Metadata block size in bytes

payload_size: u32

Compressed payload size in bytes

uncompressed_size: u32

Uncompressed payload size in bytes

compression: Compression

Compression algorithm

flags: u8

Feature flags

schema_size: u16

Schema block size in bytes

num_rows: u64

Total row count

Implementations

impl Header

pub fn new(dataset_type: DatasetType) -> Self

Create a new header with default values

pub fn to_bytes(&self) -> [u8; 32]

Serialize header to 32 bytes

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

Deserialize header from bytes

Errors

Returns error if magic is invalid, version is unsupported, or types are unknown.

pub const fn is_encrypted(&self) -> bool

Check if encrypted flag is set

pub const fn is_signed(&self) -> bool

Check if signed flag is set

pub const fn is_streaming(&self) -> bool

Check if streaming flag is set

pub const fn is_licensed(&self) -> bool

Check if licensed flag is set

pub const fn is_trueno_native(&self) -> bool

Check if trueno-native flag is set

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.

impl PartialEq for Header

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Header

impl StructuralPartialEq for Header