hexgate 0.0.1

Efficient and easy-to-use udp based client-server game networking crate
Documentation 
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.

use crate::common::PROTOCOL_VERSION;

use super::*;

pub struct InfoRequest;

impl InfoRequest {
    pub fn new() -> Self {
        InfoRequest
    }

    pub fn serialize(&self, buf: &mut [u8]) -> usize {
        buf[0] = PacketIdentifier::InfoRequest as u8;
        buf[1..8].copy_from_slice(MAGIC.as_bytes());
        buf[8] = PROTOCOL_VERSION;
        buf[9..257].fill(0);
        257
    }

    pub fn deserialize(buf: &[u8]) -> Result<Self, &'static str> {
        if buf.len() != 257 {
            return Err(ERROR_INVALID_BUFFER_SIZE);
        }

        if buf[0] != PacketIdentifier::InfoRequest as u8 {
            return Err(ERROR_INVALID_PACKET_IDENTIFIER);
        }

        if &buf[1..8] != MAGIC.as_bytes() {
            return Err(ERROR_INVALID_MAGIC);
        }

        if buf[8] != PROTOCOL_VERSION {
            // TODO: Handle protocol version mismatch better
            return Err(ERROR_INVALID_PROTOCOL_VERSION);
        }

        Ok(InfoRequest)
    }
}