Feature/send large message (#14)

* introduce send fragment

* can pass a fin frame

* can send messages which are a perfect multiple of the chunk size

* set fin only for last fragment

* cleanup

* last fragment should be of type CONTINUATION

* Add simple send and receive programs

* speedups receiving + better way to wait for thing

* receive speedup by using linked list of chunks instead of large array

* document bug

* use chunks to receive data

* trailing spaces

ixwebsocket/IXWebSocketHandshake.cpp

@@ -16,7 +16,7 @@
 #include <algorithm>
 
 
-namespace ix 
+namespace ix
 {
     WebSocketHandshake::WebSocketHandshake(std::atomic<bool>& requestInitCancellation,
                                            std::shared_ptr<Socket> socket,
@@ -171,7 +171,7 @@ namespace ix
 
     std::string WebSocketHandshake::genRandomString(const int len)
     {
-        std::string alphanum = 
+        std::string alphanum =
             "0123456789"
             "ABCDEFGH"
             "abcdefgh";
@@ -201,7 +201,7 @@ namespace ix
         char line[256];
         int i;
 
-        while (true) 
+        while (true)
         {
             int colon = 0;
 
@@ -277,7 +277,7 @@ namespace ix
     {
         _requestInitCancellation = false;
 
-        auto isCancellationRequested = 
+        auto isCancellationRequested =
             makeCancellationRequestWithTimeout(timeoutSecs, _requestInitCancellation);
 
         std::string errMsg;
@@ -372,7 +372,7 @@ namespace ix
         }
 
         // Check the value of the connection field
-        // Some websocket servers (Go/Gorilla?) send lowercase values for the 
+        // Some websocket servers (Go/Gorilla?) send lowercase values for the
         // connection header, so do a case insensitive comparison
         if (!insensitiveStringCompare(headers["connection"], "Upgrade"))
         {
@@ -418,7 +418,7 @@ namespace ix
         // Set the socket to non blocking mode + other tweaks
         SocketConnect::configure(fd);
 
-        auto isCancellationRequested = 
+        auto isCancellationRequested =
             makeCancellationRequestWithTimeout(timeoutSecs, _requestInitCancellation);
 
         std::string remote = std::string("remote fd ") + std::to_string(fd);
@@ -432,7 +432,7 @@ namespace ix
         {
             return sendErrorResponse(400, "Error reading HTTP request line");
         }
-        
+
         // Validate request line (GET /foo HTTP/1.1\r\n)
         auto requestLine = parseRequestLine(line);
         auto method      = std::get<0>(requestLine);