Struct FieldDecoder 

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

A sequential field decoder that reads typed values from a byte buffer.

Each read_* method advances an internal offset. The methods return PersistError::SerializationError if there are not enough bytes remaining.

Implementations

impl<'a> FieldDecoder<'a>

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

Creates a new decoder positioned at the start of data.

pub fn position(&self) -> usize

Returns the current byte offset within the buffer.

pub fn remaining(&self) -> usize

Returns the number of bytes remaining to be read.

pub fn is_exhausted(&self) -> bool

Returns true if all bytes have been consumed.

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

Reads a u8.

pub fn read_u16(&mut self) -> Result<u16>

Reads a u16 in big-endian byte order.

pub fn read_u32(&mut self) -> Result<u32>

Reads a u32 in big-endian byte order.

pub fn read_u64(&mut self) -> Result<u64>

Reads a u64 in big-endian byte order.

pub fn read_i8(&mut self) -> Result<i8>

Reads an i8.

pub fn read_i16(&mut self) -> Result<i16>

Reads an i16 in big-endian byte order.

pub fn read_i32(&mut self) -> Result<i32>

Reads an i32 in big-endian byte order.

pub fn read_i64(&mut self) -> Result<i64>

Reads an i64 in big-endian byte order.

pub fn read_f32(&mut self) -> Result<f32>

Reads an f32 in big-endian byte order.

pub fn read_f64(&mut self) -> Result<f64>

Reads an f64 in big-endian byte order.

pub fn read_bool(&mut self) -> Result<bool>

Reads a bool encoded as a single byte.

pub fn read_string(&mut self) -> Result<String>

Reads a length-prefixed UTF-8 string.

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

Reads a length-prefixed byte slice.

pub fn read_option_string(&mut self) -> Result<Option<String>>

Reads an optional string (bool tag + optional value).

pub fn read_option_u64(&mut self) -> Result<Option<u64>>

Reads an optional u64 (bool tag + optional value).