<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
// app/Protocols/ProtobufProtocol.php
namespace addon\wxchat\Protocols;

/**
 * ProtobufProtocol 类
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class ProtobufProtocol
{
    
    public static function input($recv_buffer, $connection) {
        if (strlen($recv_buffer) < 4) return 0;
        $len = unpack('N', substr($recv_buffer, 0, 4))[1]; // 大端序4字节长度头
        return $len + 4; // 返回本次包完整长度
    }

    
    public static function decode($recv_buffer, $connection) {
        return substr($recv_buffer, 4); // 剥离长度头，返回纯Protobuf字节流
    }

    
    public static function encode($data, $connection) {
        return pack('N', strlen($data)) . $data; // 添加4字节长度头
    }
}