Add fuzz testing drivers for json escaping and uri decoding

fuzz/CMakeLists.txt

@@ -30,7 +30,8 @@ if (ENABLE_FUZZING)
 	    COMMENT "Fuzzing ${binary}" VERBATIM)
   endmacro ()
 
-  set(targets
+
+  set(ServerTargets
 	  "match_parameters"
 	  "nearest_parameters"
 	  "route_parameters"
@@ -40,8 +41,18 @@ if (ENABLE_FUZZING)
 	  "url_parser"
 	  "request_parser")
 
-  foreach (target ${targets})
+  foreach (target ${ServerTargets})
 	  add_fuzz_target(${target})
   endforeach ()
 
+
+  set(UtilTargets
+	  "escape_json"
+	  "uri_decode")
+
+  foreach (target ${UtilTargets})
+	  add_fuzz_target(${target})
+  endforeach ()
+
+
 endif ()

fuzz/escape_json.cc

@@ -0,0 +1,18 @@
+#include "util/string_util.hpp"
+
+#include "util.hpp"
+
+#include <iterator>
+#include <string>
+
+using osrm::util::escape_JSON;
+
+extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size)
+{
+    const std::string in(reinterpret_cast<const char *>(data), size);
+
+    const auto escaped = escape_JSON(in);
+    escape(escaped.data());
+
+    return 0;
+}

fuzz/uri_decode.cc

@@ -0,0 +1,21 @@
+#include "server/api/url_parser.hpp"
+#include "util/string_util.hpp"
+
+#include "util.hpp"
+
+#include <iterator>
+#include <string>
+
+using osrm::util::URIDecode;
+
+extern "C" int LLVMFuzzerTestOneInput(const unsigned char *data, unsigned long size)
+{
+    const std::string in(reinterpret_cast<const char *>(data), size);
+    std::string out;
+
+    (void)URIDecode(in, out);
+
+    escape(out.data());
+
+    return 0;
+}