Add PerMessageDeflate fuzz target

fuzzing/Makefile

@@ -3,4 +3,5 @@ default:
 	clang++ -std=c++17 -fsanitize=address,fuzzer -O3 WebSocket.cpp -o WebSocket
 	clang++ -std=c++17 -fsanitize=address,fuzzer -O3 Http.cpp -o Http
 	clang++ -std=c++17 -fsanitize=address,fuzzer -O3 Extensions.cpp -o Extensions
-	clang++ -std=c++17 -fsanitize=address,fuzzer -O3 Handshake.cpp -o Handshake
+	clang++ -std=c++17 -fsanitize=address,fuzzer -O3 Handshake.cpp -o Handshake
+	clang++ -std=c++17 -fsanitize=address,fuzzer -O3 PerMessageDeflate.cpp -o PerMessageDeflate -lz

fuzzing/PerMessageDeflate.cpp

@@ -0,0 +1,38 @@
+/* This is a fuzz test of the permessage-deflate module */
+
+#define WIN32_EXPORT
+
+#include <cstdio>
+#include <string>
+
+/* We test the permessage deflate module */
+#include "../src/PerMessageDeflate.h"
+
+#include "helpers.h"
+
+struct StaticData {
+    uWS::ZlibContext zlibContext;
+
+    uWS::InflationStream inflationStream;
+    uWS::DeflationStream deflationStream;
+} staticData;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+
+    /* Why is this padded? */
+    makeChunked(makePadded(data, size), size, [](const uint8_t *data, size_t size) {
+        std::string_view inflation = staticData.inflationStream.inflate(&staticData.zlibContext, std::string_view((char *) data, size), 256);
+        if (inflation.length() > 256) {
+            /* Cause ASAN to freak out */
+            //delete (int *) (void *) 1;
+        }
+    });
+
+    makeChunked(makePadded(data, size), size, [](const uint8_t *data, size_t size) {
+        /* Always reset */
+        staticData.deflationStream.deflate(&staticData.zlibContext, std::string_view((char *) data, size), true);
+    });
+
+    return 0;
+}
+

fuzzing/README.md

@@ -9,6 +9,7 @@ Currently the following parts are individually tested:
 * WebSocket handshake generator
 * WebSocket message parser
 * WebSocket extensions parser & negotiator
+* WebSocket permessage-deflate compression/inflation helper
 * Http parser
 * Http method/url router