per message deflate support (with zlib)

ixwebsocket/IXWebSocketPerMessageDeflateOptions.h

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+/*
+ *  IXWebSocketPerMessageDeflateOptions.h
+ *  Author: Benjamin Sergeant
+ *  Copyright (c) 2018 Machine Zone, Inc. All rights reserved.
+ */
+
+#pragma once
+
+#include <string>
+
+namespace ix 
+{
+    class WebSocketPerMessageDeflateOptions
+    {
+    public:
+        WebSocketPerMessageDeflateOptions(
+            bool enabled = true,
+            bool clientNoContextTakeover = false,
+            bool serverNoContextTakeover = false,
+            uint8_t clientMaxWindowBits = kDefaultClientMaxWindowBits,
+            uint8_t serverMaxWindowBits = kDefaultServerMaxWindowBits);
+
+        WebSocketPerMessageDeflateOptions(std::string extension);
+
+        std::string generateHeader();
+        std::string parseHeader();
+        bool enabled() const;
+        bool getClientNoContextTakeover() const;
+        bool getServerNoContextTakeover() const;
+        uint8_t getServerMaxWindowBits() const;
+        uint8_t getClientMaxWindowBits() const;
+
+        static bool startsWith(const std::string& str, const std::string& start);
+        static std::string removeSpaces(const std::string& str);
+
+    private:
+        bool _enabled;
+        bool _clientNoContextTakeover;
+        bool _serverNoContextTakeover;
+        int _clientMaxWindowBits;
+        int _serverMaxWindowBits;
+
+        static uint8_t const kDefaultClientMaxWindowBits;
+        static uint8_t const kDefaultServerMaxWindowBits;
+    };
+}