pub fn encode_slice(packet: &Packet, buf: &mut [u8]) -> Result<usize, Error> {
    let mut offset = 0;

    match packet {
        Packet::Connect(connect) => connect.to_buffer(buf, &mut offset),
        Packet::Connack(connack) => connack.to_buffer(buf, &mut offset),
        Packet::Publish(publish) => publish.to_buffer(buf, &mut offset),
        Packet::Puback(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01000000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pubrec(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01010000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pubrel(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01100010;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pubcomp(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01110000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Subscribe(subscribe) => subscribe.to_buffer(buf, &mut offset),
        Packet::Suback(suback) => suback.to_buffer(buf, &mut offset),
        Packet::Unsubscribe(unsub) => unsub.to_buffer(buf, &mut offset),
        Packet::Unsuback(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b10110000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pingreq => {
            check_remaining(buf, &mut offset, 2)?;
            let header: u8 = 0b11000000;
            let length: u8 = 0;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            Ok(2)
        }
        Packet::Pingresp => {
            check_remaining(buf, &mut offset, 2)?;
            let header: u8 = 0b11010000;
            let length: u8 = 0;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            Ok(2)
        }
        Packet::Disconnect => {
            check_remaining(buf, &mut offset, 2)?;
            let header: u8 = 0b11100000;
            let length: u8 = 0;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            Ok(2)
        }
    }
}
/// Encode a [Packet] enum into a u8 slice.
///
/// ```
/// # use mqttrust::encoding::v4::*;
/// // Instantiate a `Packet` to encode.
/// let packet = Publish {
///    dup: false,
///    qos: QoS::AtMostOnce,
///    retain: false,
///    topic_name: "test",
///    payload: b"hello",
///    pid: None,
/// }.into();
///
/// // Allocate buffer (should be appropriately-sized or able to grow as needed).
/// let mut buf = [0u8; 1024];
///
/// // Write bytes corresponding to `&Packet` into the `BytesMut`.
/// let len = encode_slice(&packet, &mut buf).expect("failed encoding");
/// assert_eq!(&buf[..len], &[0b00110000, 11,
///                     0, 4, b't', b'e', b's', b't',
///                    b'h', b'e', b'l', b'l', b'o']);
/// ```
///
/// [Packet]: ../enum.Packet.html
Encode a [Packet] enum into a u8 slice.
Encode a [ Packet ] enum into a u8 slice .
pub fn encode_slice(packet: &Packet, buf: &mut [u8]) -> Result<usize, Error> {
    let mut offset = 0;
    match packet {
        Packet::Connect(connect) => connect.to_buffer(buf, &mut offset),
        Packet::Connack(connack) => connack.to_buffer(buf, &mut offset),
        Packet::Publish(publish) => publish.to_buffer(buf, &mut offset),
        Packet::Puback(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01000000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pubrec(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01010000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pubrel(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01100010;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pubcomp(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b01110000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Subscribe(subscribe) => subscribe.to_buffer(buf, &mut offset),
        Packet::Suback(suback) => suback.to_buffer(buf, &mut offset),
        Packet::Unsubscribe(unsub) => unsub.to_buffer(buf, &mut offset),
        Packet::Unsuback(pid) => {
            check_remaining(buf, &mut offset, 4)?;
            let header: u8 = 0b10110000;
            let length: u8 = 2;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            pid.to_buffer(buf, &mut offset)?;
            Ok(4)
        }
        Packet::Pingreq => {
            check_remaining(buf, &mut offset, 2)?;
            let header: u8 = 0b11000000;
            let length: u8 = 0;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            Ok(2)
        }
        Packet::Pingresp => {
            check_remaining(buf, &mut offset, 2)?;
            let header: u8 = 0b11010000;
            let length: u8 = 0;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            Ok(2)
        }
        Packet::Disconnect => {
            check_remaining(buf, &mut offset, 2)?;
            let header: u8 = 0b11100000;
            let length: u8 = 0;
            write_u8(buf, &mut offset, header)?;
            write_u8(buf, &mut offset, length)?;
            Ok(2)
        }
    }
}
pub fn encode_slice ( packet : & Packet , buf : & mut [ u8 ] ) -> Result < usize , Error > { let mut offset = 0 ; match packet { Packet :: Connect ( connect ) => connect . to_buffer ( buf , & mut offset ) , Packet :: Connack ( connack ) => connack . to_buffer ( buf , & mut offset ) , Packet :: Publish ( publish ) => publish . to_buffer ( buf , & mut offset ) , Packet :: Puback ( pid ) => { check_remaining ( buf , & mut offset , 4 ) ? ; let header : u8 = 0b01000000 ; let length : u8 = 2 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; pid . to_buffer ( buf , & mut offset ) ? ; Ok ( 4 ) } Packet :: Pubrec ( pid ) => { check_remaining ( buf , & mut offset , 4 ) ? ; let header : u8 = 0b01010000 ; let length : u8 = 2 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; pid . to_buffer ( buf , & mut offset ) ? ; Ok ( 4 ) } Packet :: Pubrel ( pid ) => { check_remaining ( buf , & mut offset , 4 ) ? ; let header : u8 = 0b01100010 ; let length : u8 = 2 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; pid . to_buffer ( buf , & mut offset ) ? ; Ok ( 4 ) } Packet :: Pubcomp ( pid ) => { check_remaining ( buf , & mut offset , 4 ) ? ; let header : u8 = 0b01110000 ; let length : u8 = 2 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; pid . to_buffer ( buf , & mut offset ) ? ; Ok ( 4 ) } Packet :: Subscribe ( subscribe ) => subscribe . to_buffer ( buf , & mut offset ) , Packet :: Suback ( suback ) => suback . to_buffer ( buf , & mut offset ) , Packet :: Unsubscribe ( unsub ) => unsub . to_buffer ( buf , & mut offset ) , Packet :: Unsuback ( pid ) => { check_remaining ( buf , & mut offset , 4 ) ? ; let header : u8 = 0b10110000 ; let length : u8 = 2 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; pid . to_buffer ( buf , & mut offset ) ? ; Ok ( 4 ) } Packet :: Pingreq => { check_remaining ( buf , & mut offset , 2 ) ? ; let header : u8 = 0b11000000 ; let length : u8 = 0 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; Ok ( 2 ) } Packet :: Pingresp => { check_remaining ( buf , & mut offset , 2 ) ? ; let header : u8 = 0b11010000 ; let length : u8 = 0 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; Ok ( 2 ) } Packet :: Disconnect => { check_remaining ( buf , & mut offset , 2 ) ? ; let header : u8 = 0b11100000 ; let length : u8 = 0 ; write_u8 ( buf , & mut offset , header ) ? ; write_u8 ( buf , & mut offset , length ) ? ; Ok ( 2 ) } } }
Encode a [Packet] enum into a u8 slice.
Encode a [ Packet ] enum into a u8 slice .
packet
&Packet
buf
&mut [u8]
packet
&Packet
buf
&mut [u8]
use mqttrust::encoding::v4::*;
Instantiate a `Packet` to encode.
let packet = Publish {
dup: false,
qos: QoS::AtMostOnce,
retain: false,
topic_name: "test",
payload: b"hello",
pid: None,
}.into().

Allocate buffer (should be appropriately-sized or able to grow as needed).

Write bytes corresponding to `&Packet` into the `BytesMut`.

[Packet]: ../enum.Packet.html
Instantiate a ` Packet ` to encode . let packet = Publish { dup : false qos : QoS :: AtMostOnce retain : false topic_name : " test " payload : b " hello " pid : None } . into () . Allocate buffer ( should be appropriately - sized or able to grow as needed ) . Write bytes corresponding to ` &Packet ` into the ` BytesMut ` . [ Packet ] : .. / enum . Packet . html