Struct TlvWriter 

pub struct TlvWriter { /* private fields */ }

TLV encoder backed by a growable BytesMut buffer.

Implementations

impl TlvWriter

pub fn new() -> Self

pub fn with_capacity(cap: usize) -> Self

pub fn write_tlv(&mut self, typ: u64, value: &[u8])

Write a flat TLV element (type + length + value bytes).

pub fn write_nested<F>(&mut self, typ: u64, f: F)

where F: FnOnce(&mut TlvWriter),

Write a nested TLV element. The closure encodes the inner content; this method wraps it with the correct outer type and length.

Inner content is written to a temporary writer, then the type, minimal length, and content are appended to the main buffer.

pub fn write_varu64(&mut self, value: u64)

Write a raw VarNumber (type or length field) without TLV framing.

pub fn write_raw(&mut self, data: &[u8])

Write raw bytes directly into the buffer (no TLV framing).

Used when embedding a pre-encoded signed region into an outer TLV.

pub fn slice_from(&self, start: usize) -> &[u8]

Return a zero-copy view of the bytes written since start offset.

Used to read back a signed region written incrementally — e.g. to pass it to a signing function or to copy it into an outer TLV. No allocation.

pub fn snapshot(&self, start: usize) -> Vec<u8>

👎Deprecated: use slice_from for a zero-copy &u8

Return a copy of the bytes written since start offset.

Prefer [slice_from] when a borrowed slice is sufficient.

pub fn finish(self) -> Bytes

Freeze and return the encoded bytes.

pub fn len(&self) -> usize

Current encoded length in bytes.

pub fn is_empty(&self) -> bool

Trait Implementations

impl Default for TlvWriter

fn default() -> Self

Returns the “default value” for a type.