private void Parse()
{
// 解析定长消息头
try
{
var buf = new byte[PackageHead.Size];
BaseStream.ReadAsync(buf, 0, buf.Length, () =>
{
var head = new PackageHead();
head.Deserialize(buf);
// 解析变长消息体
buf = new byte[head.Length];
BaseStream.ReadAsync(buf, 0, buf.Length, () =>
{
var data = new ArraySegment <byte>((head.Flag & PackageFlag.Compress) != 0 ? Common.ZlibCodec.Decode(buf) : buf);
OnPackage(data);
// 继续下一条消息解析
Parse();
}, OnError);
}, OnError);
}
catch (Exception ex)
{
OnError(ex);
}
}
private static bool WritePackage(ArraySegment <byte> data, Stream stream)
{
if (stream == null || stream.CanWrite == false)
{
return(false);
}
var head = new PackageHead();
if (data.Count > 32)
{
head.Flag = PackageFlag.Compress;
data = new ArraySegment <byte>(Common.ZlibCodec.Encode(data));
}
head.Length = data.Count;
// 因“多个同时进行的异步请求会使请求完成顺序不确定”，此处采用同步写
// http://msdn.microsoft.com/zh-cn/library/system.io.stream.beginwrite
var buf = head.Serialize();
stream.Write(buf, 0, buf.Length);
stream.Write(data.Array, data.Offset, data.Count);
return(true);
}