/// <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);
}
/// <summary>
/// 生成表单和文件
/// </summary>
/// <param name="request">请求</param>
/// <param name="streamReader">数据读取器</param>
/// <param name="boundary">边界</param>
private static void GenerateMultipartFormAndFiles(HttpRequest request, ISessionStreamReader streamReader, string boundary)
{
var boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary);
var maxPosition = streamReader.Length - Encoding.ASCII.GetBytes("--\r\n").Length;
var files = new List <HttpFile>();
var form = new HttpNameValueCollection();
streamReader.Position = streamReader.Position + boundaryBytes.Length;
while (streamReader.Position < maxPosition)
{
var headLength = streamReader.IndexOf(DoubleCRLF) + DoubleCRLF.Length;
if (headLength < DoubleCRLF.Length)
{
break;
}
var head = streamReader.ReadString(Encoding.UTF8, headLength);
var bodyLength = streamReader.IndexOf(boundaryBytes);
if (bodyLength < 0)
{
break;
}
var mHead = new MultipartHead(head);
if (mHead.TryGetFileName(out string fileName) == true)
{
var bytes = streamReader.ReadArray(bodyLength);
var file = new HttpFile(mHead.Name, fileName, bytes);
files.Add(file);
}
/// <summary>
/// 生成表单和文件
/// </summary>
/// <param name="request">请求</param>
/// <param name="streamReader">数据读取器</param>
/// <param name="boundary">边界</param>
private static void GenerateMultipartFormAndFiles(HttpRequest request, ISessionStreamReader streamReader, string boundary)
{
var boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + boundary);
var maxPosition = streamReader.Length - Encoding.ASCII.GetBytes("--\r\n").Length;
var files = new List <HttpFile>();
var form = new HttpNameValueCollection();
streamReader.Position = streamReader.Position + boundaryBytes.Length;
while (streamReader.Position < maxPosition)
{
var headLength = streamReader.IndexOf(DoubleCRLF) + DoubleCRLF.Length;
if (headLength < DoubleCRLF.Length)
{
break;
}
var head = streamReader.ReadString(Encoding.UTF8, headLength);
var bodyLength = streamReader.IndexOf(boundaryBytes);
if (bodyLength < 0)
{
break;
}
string fileName = null;
var partItem = new MultipartItem(head);
if (partItem.TryGetFileName(out fileName) == true)
{
var bytes = streamReader.ReadArray(bodyLength);
var file = new HttpFile(partItem.Name, fileName, bytes);
files.Add(file);
}
else
{
var byes = streamReader.ReadArray(bodyLength);
var value = HttpUtility.UrlDecode(byes, Encoding.UTF8);
form.Add(partItem.Name, value);
}
streamReader.Position = streamReader.Position + boundaryBytes.Length;
}
request.Form = form;
request.Files = files.ToArray();
}
/// <summary>
/// 解析一个数据包
/// 不足一个封包时packet返回null
/// 中间件不符合则返回false
/// </summary>
/// <param name="session">会话</param>
/// <param name="packet">数据包</param>
/// <returns></returns>
public virtual bool Parse(ISessionStreamReader streamReader, ISession session, out string packet)
{
packet = null;
try
{
int required = 28;
int remain = session.RemainDataLength;//剩余长度
while (remain >= required)
{
// 实体数据
packet = Encoding.UTF8.GetString(streamReader.ReadArray(required));
// 清空本条数据
streamReader.Clear(required);
return(true);
}
return(true);
}
catch (Exception)
{
return(false);
}
}
/// <summary>
/// 解析请求的数据
/// 返回请求数据包
/// </summary>
/// <param name="streamReader">数据读取器</param>
/// <param name="requiredMask">是否要求必须Mask</param>
/// <exception cref="NotSupportedException"></exception>
/// <returns></returns>
public unsafe static FrameRequest Parse(ISessionStreamReader streamReader, bool requiredMask = true)
{
if (streamReader.Length < 2)
{
return(null);
}
ByteBits byte0 = streamReader[0];
var fin = byte0[0];
var rsv = byte0.Take(1, 3);
var frameCode = (FrameCodes)(byte)byte0.Take(4, 4);
ByteBits byte1 = streamReader[1];
var mask = byte1[0];
if (requiredMask && mask == false)
{
throw new NotSupportedException("mask is required");
}
if (Enum.IsDefined(typeof(FrameCodes), frameCode) == false || rsv != 0)
{
throw new NotSupportedException();
}
var contentSize = 0;
var contentLength = (int)byte1.Take(1, 7);
streamReader.Position = 2;
if (contentLength == 127)
{
contentSize = 8;
contentLength = (int)streamReader.ReadUInt64();
}
else if (contentLength == 126)
{
contentSize = 2;
contentLength = (int)streamReader.ReadUInt16();
}
var maskSize = mask ? 4 : 0;
var packetLength = 2 + maskSize + contentSize + contentLength;
if (streamReader.Length < packetLength)
{
return(null);
}
var maskingKey = mask ? streamReader.ReadArray(4) : null;
var content = streamReader.ReadArray(contentLength);
streamReader.Clear(packetLength);
if (mask && contentLength > 0)
{
fixed(byte *pcontent = &content[0], pmask = &maskingKey[0])
{
for (var i = 0; i < contentLength; i++)
{
*(pcontent + i) = (byte)(*(pcontent + i) ^ *(pmask + i % 4));
}
}
}
return(new FrameRequest
{
Fin = fin,
Rsv = rsv,
Mask = mask,
Frame = frameCode,
ContentLength = contentLength,
MaskingKey = maskingKey,
Content = content
});
}
