Struct PacketWriter 

pub struct PacketWriter { /* private fields */ }

A writer for MySQL protocol data.

Implementations

impl PacketWriter

pub fn new() -> Self

Create a new writer with default capacity.

pub fn with_capacity(capacity: usize) -> Self

Create a new writer with specified capacity.

pub fn len(&self) -> usize

Get the current buffer length.

pub fn is_empty(&self) -> bool

Check if the buffer is empty.

pub fn clear(&mut self)

Clear the buffer.

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

Get the buffer as a byte slice.

pub fn into_bytes(self) -> Vec<u8>

Consume the writer and return the buffer.

pub fn write_u8(&mut self, value: u8)

Write a single byte.

pub fn write_u16_le(&mut self, value: u16)

Write a u16 (little-endian).

pub fn write_u24_le(&mut self, value: u32)

Write a u24 (little-endian, 3 bytes).

pub fn write_u32_le(&mut self, value: u32)

Write a u32 (little-endian).

pub fn write_u64_le(&mut self, value: u64)

Write a u64 (little-endian).

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

Write a length-encoded integer.

MySQL uses a variable-length integer encoding:

• 0x00-0xFA: 1-byte value
• 0xFC + 2 bytes: values up to 2^16
• 0xFD + 3 bytes: values up to 2^24
• 0xFE + 8 bytes: values up to 2^64

pub fn write_lenenc_string(&mut self, s: &str)

Write a length-encoded string.

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

Write a length-encoded byte slice.

pub fn write_null_string(&mut self, s: &str)

Write a null-terminated string.

pub fn write_fixed_string(&mut self, s: &str, len: usize)

Write a fixed-length string, padding with zeros if necessary.

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

Write raw bytes.

pub fn write_zeros(&mut self, count: usize)

Write zeros (padding).

pub fn build_packet(&self, sequence_id: u8) -> Vec<u8>

Build a complete packet with header and payload.

This handles splitting large payloads into multiple packets if needed (payloads over 16MB - 1).

pub fn build_packet_from_payload( &self, payload: &[u8], sequence_id: u8, ) -> Vec<u8>

Build a packet from a given payload.

Trait Implementations

impl Debug for PacketWriter

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

Formats the value using the given formatter.

impl Default for PacketWriter

fn default() -> PacketWriter

Returns the “default value” for a type.