Struct DbObjectPackedReader 

pub struct DbObjectPackedReader<'a> { /* private fields */ }

Implementations

impl<'a> DbObjectPackedReader<'a>

pub fn new(bytes: &'a [u8]) -> Self

pub fn read_u8(&mut self) -> Result<u8>

pub fn read_i32be(&mut self) -> Result<i32>

pub fn read_length(&mut self) -> Result<usize>

pub fn read_value_bytes(&mut self) -> Result<Option<Vec<u8>>>

pub fn read_header(&mut self) -> Result<()>

pub fn remaining(&self) -> usize

Bytes still unread in the packed image. Exposed so a caller materializing a collection (whose element count is a server-declared read_length) can bound its Vec pre-allocation against the buffer via the BoundedReader trait — closing the OOM-from-length class for DbObject collections too.

pub fn read_atomic_null(&mut self, is_collection_context: bool) -> Result<bool>

Trait Implementations

impl BoundedReader for DbObjectPackedReader<'_>

fn remaining(&self) -> usize

Bytes still unread in the current message buffer. The ceiling on any count-driven allocation.

fn alloc_count_checked( &self, count: usize, min_bytes_per_elem: usize, ) -> Result<usize>

Validate a server-declared element count against the buffer: a run of count elements must carry at least count * min_bytes_per_elem bytes, so a count whose minimum byte footprint exceeds [remaining] is a lie. Returns the (unchanged) count when it fits, or a fail-closed ProtocolError::TtcDecode otherwise — never a panic, never an OOM.

fn with_capacity_bounded<T>( &self, count: usize, min_bytes_per_elem: usize, ) -> Vec<T>

Pre-size a Vec for count elements without trusting count: the reserved capacity is capped at remaining() / min_bytes_per_elem, the largest number of elements the buffer could actually hold. The returned Vec is a normal growable Vec, so a legitimately large payload (where count really fits) is pre-sized to the honest count, and a streamed / chunked field that grows past the initial buffer still appends correctly — the cap only governs the speculative up-front reservation.