pub(crate) fn read_packet<T,U>(conn: &mut OssuaryConnection,
                    mut stream: T) ->Result<(NetworkPacket, usize), OssuaryError>
where T: std::ops::DerefMut<Target = U>,
      U: std::io::Read {
    let header_size = ::std::mem::size_of::<PacketHeader>();
    let bytes_read: usize;
    match stream.read(&mut conn.read_buf[conn.read_buf_used..]) {
        Ok(b) => bytes_read = b,
        Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
            return Err(OssuaryError::WouldBlock(0))
        },
        Err(e) => return Err(e.into()),
    }
    conn.read_buf_used += bytes_read;
    let buf: &[u8] = &conn.read_buf;
    let hdr = PacketHeader {
        len: u16::from_be_bytes(buf[0..2].try_into()?),
        msg_id: u16::from_be_bytes(buf[2..4].try_into()?),
        packet_type: PacketType::from_u16(u16::from_be_bytes(buf[4..6].try_into()?)),
        _reserved: u16::from_be_bytes(buf[6..8].try_into()?),
    };
    let packet_len = hdr.len as usize;
    if conn.read_buf_used < header_size + packet_len {
        if header_size + packet_len > PACKET_BUF_SIZE {
            return Err(OssuaryError::InvalidPacket("Oversized packet".into()));
        }
        return Err(OssuaryError::WouldBlock(bytes_read));
    }
    let buf: Box<[u8]> = (&conn.read_buf[header_size..header_size+packet_len])
        .to_vec().into_boxed_slice();
    let excess = conn.read_buf_used - header_size - packet_len;
    unsafe {
        // no safe way to memmove() in Rust?
        std::ptr::copy::<u8>(
            conn.read_buf.as_ptr().offset((header_size + packet_len) as isize),
            conn.read_buf.as_mut_ptr(),
            excess);
    }
    conn.read_buf_used = excess;
    Ok((NetworkPacket {
        header: hdr,
        data: buf,
    },
    header_size + packet_len))
}
/// Read a complete network packet from the input stream.
///
/// On success, returns a NetworkPacket struct containing the header and data,
/// and a `usize` indicating how many bytes were consumed from the input buffer.
Read a complete network packet from the input stream.
On success, returns a NetworkPacket struct containing the header and data,
and a `usize` indicating how many bytes were consumed from the input buffer.
Read a complete network packet from the input stream . On success returns a NetworkPacket struct containing the header and data and a ` usize ` indicating how many bytes were consumed from the input buffer .
pub(crate) fn read_packet<T,U>(conn: &mut OssuaryConnection,
                    mut stream: T) ->Result<(NetworkPacket, usize), OssuaryError>
where T: std::ops::DerefMut<Target = U>,
      U: std::io::Read {
    let header_size = ::std::mem::size_of::<PacketHeader>();
    let bytes_read: usize;
    match stream.read(&mut conn.read_buf[conn.read_buf_used..]) {
        Ok(b) => bytes_read = b,
        Err(ref e) if e.kind() == std::io::ErrorKind::WouldBlock => {
            return Err(OssuaryError::WouldBlock(0))
        },
        Err(e) => return Err(e.into()),
    }
    conn.read_buf_used += bytes_read;
    let buf: &[u8] = &conn.read_buf;
    let hdr = PacketHeader {
        len: u16::from_be_bytes(buf[0..2].try_into()?),
        msg_id: u16::from_be_bytes(buf[2..4].try_into()?),
        packet_type: PacketType::from_u16(u16::from_be_bytes(buf[4..6].try_into()?)),
        _reserved: u16::from_be_bytes(buf[6..8].try_into()?),
    };
    let packet_len = hdr.len as usize;
    if conn.read_buf_used < header_size + packet_len {
        if header_size + packet_len > PACKET_BUF_SIZE {
            return Err(OssuaryError::InvalidPacket("Oversized packet".into()));
        }
        return Err(OssuaryError::WouldBlock(bytes_read));
    }
    let buf: Box<[u8]> = (&conn.read_buf[header_size..header_size+packet_len])
        .to_vec().into_boxed_slice();
    let excess = conn.read_buf_used - header_size - packet_len;
    unsafe {
        // no safe way to memmove() in Rust?
        std::ptr::copy::<u8>(
            conn.read_buf.as_ptr().offset((header_size + packet_len) as isize),
            conn.read_buf.as_mut_ptr(),
            excess);
    }
    conn.read_buf_used = excess;
    Ok((NetworkPacket {
        header: hdr,
        data: buf,
    },
    header_size + packet_len))
}
pub ( crate ) fn read_packet < T , U > ( conn : & mut OssuaryConnection , mut stream : T ) -> Result < ( NetworkPacket , usize ) , OssuaryError > where T : std :: ops :: DerefMut < Target = U > , U : std :: io :: Read { let header_size = :: std :: mem :: size_of :: < PacketHeader > ( ) ; let bytes_read : usize ; match stream . read ( & mut conn . read_buf [ conn . read_buf_used .. ] ) { Ok ( b ) => bytes_read = b , Err ( ref e ) if e . kind ( ) == std :: io :: ErrorKind :: WouldBlock => { return Err ( OssuaryError :: WouldBlock ( 0 ) ) } , Err ( e ) => return Err ( e . into ( ) ) , } conn . read_buf_used += bytes_read ; let buf : & [ u8 ] = & conn . read_buf ; let hdr = PacketHeader { len : u16 :: from_be_bytes ( buf [ 0 .. 2 ] . try_into ( ) ? ) , msg_id : u16 :: from_be_bytes ( buf [ 2 .. 4 ] . try_into ( ) ? ) , packet_type : PacketType :: from_u16 ( u16 :: from_be_bytes ( buf [ 4 .. 6 ] . try_into ( ) ? ) ) , _reserved : u16 :: from_be_bytes ( buf [ 6 .. 8 ] . try_into ( ) ? ) , } ; let packet_len = hdr . len as usize ; if conn . read_buf_used < header_size + packet_len { if header_size + packet_len > PACKET_BUF_SIZE { return Err ( OssuaryError :: InvalidPacket ( " " . into ( ) ) ) ; } return Err ( OssuaryError :: WouldBlock ( bytes_read ) ) ; } let buf : Box < [ u8 ] > = ( & conn . read_buf [ header_size .. header_size + packet_len ] ) . to_vec ( ) . into_boxed_slice ( ) ; let excess = conn . read_buf_used - header_size - packet_len ; unsafe { // no safe way to memmove() in Rust? std :: ptr :: copy :: < u8 > ( conn . read_buf . as_ptr ( ) . offset ( ( header_size + packet_len ) as isize ) , conn . read_buf . as_mut_ptr ( ) , excess ) ; } conn . read_buf_used = excess ; Ok ( ( NetworkPacket { header : hdr , data : buf , } , header_size + packet_len ) ) }
Read a complete network packet from the input stream.
Read a complete network packet from the input stream .
conn
&mut OssuaryConnection
stream
T
conn
&mut OssuaryConnection
stream
T