Add fuzz testing

fuzzing/WebSocket.cpp

@@ -0,0 +1,59 @@
+/* This is a fuzz test of the websocket parser */
+
+#define WIN32_EXPORT
+
+/* We test the websocket parser */
+#include "../src/WebSocketProtocol.h"
+
+/* We use this to pad the fuzz */
+char *padded = new char[1024  * 500];
+
+struct Impl {
+    static bool refusePayloadLength(uint64_t length, uWS::WebSocketState<true> *wState, void *s) {
+
+        /* We need a limit */
+        if (length > 16000) {
+            return true;
+        }
+
+        /* Return ok */
+        return false;
+    }
+
+    static bool setCompressed(uWS::WebSocketState<true> *wState, void *s) {
+        /* We support it */
+        return true;
+    }
+
+    static void forceClose(uWS::WebSocketState<true> *wState, void *s) {
+
+    }
+
+    static bool handleFragment(char *data, size_t length, unsigned int remainingBytes, int opCode, bool fin, uWS::WebSocketState<true> *webSocketState, void *s) {
+
+        if (opCode == uWS::TEXT) {
+            if (!uWS::protocol::isValidUtf8((unsigned char *)data, length)) {
+                /* Return break */
+                return true;
+            }
+        } else if (opCode == uWS::CLOSE) {
+            uWS::protocol::parseClosePayload((char *)data, length);
+        }
+
+        /* Return ok */
+        return false;
+    }
+};
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+
+    /* Pad the fuzz */
+    uWS::WebSocketState<true> state;
+    memcpy(padded + 32, data, size);
+
+    /* Parse it */
+    uWS::WebSocketProtocol<true, Impl>::consume((char *)padded + 32, size, &state, nullptr);
+
+    return 0;
+}
+