using SuperSocket.ProtoBase;
using System;
using System.Buffers;
using System.Collections.Generic;
using System.Text;
using System.Linq;

namespace IStation.Server 
{
    /// <summary>
    /// 
    /// </summary>
    internal class PipeLineFilter : FixedHeaderPipelineFilter<PackageInfo>
    {
        /// <summary>
        /// 
        /// </summary>
        public PipeLineFilter() : base(20) { }

        /// <summary>
        /// 
        /// </summary>
        protected override int GetBodyLengthFromHeader(ref ReadOnlySequence<byte> buffer)
        {
            if (buffer.Length < 20)
                return default;
            return BitConverter.ToInt32(buffer.ToArray(), 16);
        }

        /// <summary>
        /// 将数据包解析成 MyPackage 的实例
        /// </summary> 
        protected override PackageInfo DecodePackage(ref ReadOnlySequence<byte> buffer)
        {
            if (buffer.Length < 20)
                return default;
            var reader = buffer.ToArray();
            return new PackageInfo(reader);
        }

    }
}