🔨 split AFL test in driver and test file

test/src/fuzzer-driver_afl.cpp

@@ -0,0 +1,33 @@
+/*
+    __ _____ _____ _____
+ __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
+|  |  |__   |  |  | | | |  version 2.0.9
+|_____|_____|_____|_|___|  https://github.com/nlohmann/json
+
+This file implements a driver for American Fuzzy Lop (afl-fuzz). It relies on
+an implementation of the `LLVMFuzzerTestOneInput` function which processes a
+passed byte array.
+
+Licensed under the MIT License <http://opensource.org/licenses/MIT>.
+*/
+
+#include <sstream>
+#include <cstdint>
+#include <iostream>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size);
+
+int main()
+{
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    while (__AFL_LOOP(1000))
+    {
+#endif
+        // copy stdin to stringstream to pass it to fuzzer as byte array
+        std::stringstream ss;
+        ss << std::cin.rdbuf();
+        LLVMFuzzerTestOneInput(reinterpret_cast<const uint8_t*>(ss.str().c_str()), ss.str().size());
+#ifdef __AFL_HAVE_MANUAL_CONTROL
+    }
+#endif
+}