DatagramResolver

using System;
using System.Text;
using System.Text.RegularExpressions;

namespace Rocky.Net
{
    /// <summary> 
    /// 数据报文分析器,通过分析接收到的原始数据,得到完整的数据报文. 
    /// 通常的报文识别方法包括:固定长度,长度标记,标记符等方法 
    /// </summary> 
    internal static class DatagramResolver
    {
        public const int MaxDatagramSize = 1024 * 8;
        public const string EndFlag = "<EOF>";

        /// <summary> 
        /// 解析报文 
        /// </summary> 
        /// <returns>报文数组,原始数据可能包含多个报文</returns> 
        public static string[] Resolve(StringBuilder sb)
        {
            if (sb.Length == 0)
            {
                return new string[0];
            }
            string buffer = sb.ToString();
            sb.Length = 0;
            string[] resolved = Regex.Split(buffer, EndFlag);
            int size = resolved.Length - 1;
            if (resolved[size].Length < MaxDatagramSize)
            {
                sb.Append(resolved[size]);
            }
            Array.Resize<string>(ref resolved, size);
            return resolved;
        }
    }
}