Struct ChunkDescriptor 

pub struct ChunkDescriptor {
    pub chunk_type: ChunkType,
    pub offset: u64,
    pub size_uncompressed: u64,
    pub size_compressed: u64,
    pub flags: u32,
}

One 32-byte chunk directory entry.

Fields

chunk_type: ChunkType

Four-letter chunk type tag.

offset: u64

Absolute byte offset of the payload. 0 marks a null descriptor.

size_uncompressed: u64

Payload size after decompression.

size_compressed: u64

Stored size including any AEAD framing, or 0 for a raw payload.

flags: u32

Chunk-specific flags: bit 4 is ENCRYPTED, and PREV/EXTD define more.

Implementations

impl ChunkDescriptor

pub const NULL: ChunkDescriptor

A descriptor occupying no space, as a writer pre-allocating directory slots would leave it.

pub fn parse(buf: &[u8]) -> Result<ChunkDescriptor>

Parse one descriptor.

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

Serialize to exactly 32 bytes.

pub fn is_null(&self) -> bool

Whether this slot holds no chunk.

pub fn is_encrypted(&self) -> bool

Whether this payload is sealed.

pub fn stored_len(&self) -> u64

The on-disk byte length of this chunk: size_uncompressed for a raw payload, size_compressed when the chunk is compressed or sealed.

A LAYR chunk reads both ways round without ambiguity: its size_uncompressed is the container’s byte length - the version field plus the frame - and size_compressed is zero while that frame is in the clear and the same total once it is sealed.

pub fn extent(&self) -> (u64, u64)

The half-open byte range this chunk occupies in the file.

Trait Implementations

impl Clone for ChunkDescriptor

fn clone(&self) -> ChunkDescriptor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for ChunkDescriptor

impl Debug for ChunkDescriptor

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

Formats the value using the given formatter.

impl Eq for ChunkDescriptor

impl PartialEq for ChunkDescriptor

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ChunkDescriptor