Enum Chunk 

pub enum Chunk {
    Form {
        secondary_id: ChunkId,
        length: u32,
        children: Vec<Chunk>,
    },
    Leaf {
        id: ChunkId,
        data: Vec<u8>,
    },
}

A parsed IFF chunk — either a FORM container or a leaf data chunk.

Variants

Form

A FORM container with a secondary ID and child chunks.

Fields

secondary_id: ChunkId

The secondary ID (e.g., b“DJVU“, b“DJVM“, b“DJVI“, b“THUM“).

length: u32

Total byte length of the FORM payload (from the IFF length field). Includes the 4-byte secondary ID and all child chunk bytes.

children: Vec<Chunk>

Child chunks within this FORM.

Leaf

A leaf chunk with raw data.

Fields

id: ChunkId

The chunk ID (e.g., b“INFO“, b“Sjbz“, b“BG44“).

data: Vec<u8>

The raw chunk payload bytes.

Implementations

impl Chunk

pub fn data(&self) -> &[u8]

For leaf chunks, return the data slice. For FORM chunks, returns empty slice.

pub fn children(&self) -> &[Chunk]

For FORM chunks, return children. For leaf chunks, returns empty slice.

pub fn payload_length(&self) -> u32

Return the declared payload length from the IFF length field.

For Form chunks, this is the value read from the IFF header — it covers the secondary ID (4 bytes) and all children. For Leaf chunks, this equals data().len().

pub fn find_first(&self, target_id: &[u8; 4]) -> Option<&Chunk>

Find the first leaf chunk with the given ID in direct children.

pub fn find_all(&self, target_id: &[u8; 4]) -> Vec<&Chunk>

Find all leaf chunks with the given ID in direct children.

Trait Implementations

impl Clone for Chunk

fn clone(&self) -> Chunk

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Chunk

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

Formats the value using the given formatter.