/// <summary>
/// 解析一个数据包
/// 不足一个封包时返回null
/// </summary>
/// <param name="streamReader">数据读取器</param>
/// <param name="packet">数据包</param>
/// <returns></returns>
public static bool Parse(ISessionStreamReader streamReader, out FastPacket packet)
{
packet = null;
const int packetMinSize = 16;
if (streamReader.Length < packetMinSize || streamReader[0] != FastPacket.Mark)
{
return(false);
}
streamReader.Position = 1;
var totalBytes = streamReader.ReadInt32();
if (totalBytes < packetMinSize)
{
return(false);
}
// 数据包未接收完整
if (streamReader.Length < totalBytes)
{
return(true);
}
// api名称数据长度
var apiNameLength = streamReader.ReadByte();
if (totalBytes < apiNameLength + packetMinSize)
{
return(false);
}
// api名称数据
var apiNameBytes = streamReader.ReadArray(apiNameLength);
// 标识符
var id = streamReader.ReadInt64();
// 是否为客户端封包
var isFromClient = streamReader.ReadBoolean();
// 是否异常
var isException = streamReader.ReadBoolean();
// 实体数据
var body = streamReader.ReadArray(totalBytes - streamReader.Position);
// 清空本条数据
streamReader.Clear(totalBytes);
var apiName = Encoding.UTF8.GetString(apiNameBytes);
packet = new FastPacket(apiName, id, isFromClient)
{
TotalBytes = totalBytes,
ApiNameLength = apiNameLength,
IsException = isException,
Body = body
};
return(true);
}
