adds oss-fuzz setup.

CMakeLists.txt

@@ -20,6 +20,7 @@ option(PISTACHE_BUILD_TESTS "build tests alongside the project" OFF)
 option(PISTACHE_ENABLE_NETWORK_TESTS "if tests are built, run ones needing network access" ON)
 option(PISTACHE_USE_SSL "add support for SSL server" OFF)
 option(PISTACHE_PIC "Enable pistache PIC" ON)
+option(PISTACHE_BUILD_FUZZ "Build fuzzer for oss-fuzz" OFF)
 
 # require fat LTO objects in static library
 if(CMAKE_INTERPROCEDURAL_OPTIMIZATION OR CMAKE_CXX_FLAGS MATCHES "-flto" OR CMAKE_CXX_FLAGS MATCHES "-flto=thin")
@@ -105,6 +106,10 @@ if (PISTACHE_BUILD_TESTS)
     add_subdirectory(tests)
 endif()
 
+if (PISTACHE_BUILD_FUZZ) 
+    add_subdirectory(tests/fuzzers)
+endif()
+
 # format target
 
 add_custom_target(format

tests/fuzzers/CMakeLists.txt

+add_executable(fuzz_parser fuzz_parser.cpp)
+target_link_libraries(fuzz_parser pistache_static)
+set_target_properties(fuzz_parser PROPERTIES LINK_FLAGS $ENV{LIB_FUZZING_ENGINE})

tests/fuzzers/fuzz_parsers.cpp

+#include <pistache/http.h>
+
+using namespace Pistache;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    std::string input(reinterpret_cast<const char*>(data), size);
+
+    // URI parsing
+    Http::Uri::Query query1;
+    query1.add(input, input);
+
+    // HTTP parsing
+    Pistache::Http::Header::CacheControl cc1;
+    try {
+        cc1.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::Accept a1;
+    try {
+        a1.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::Accept a2;
+    try {
+        a2.parse(input);
+    } catch (...) {}
+
+    Pistache::Http::Header::Authorization au;
+    try {
+        au.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::Expect e;
+    try {
+        e.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::Connection connection;
+    try {
+        connection.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::Date d;
+    try {
+        d.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::Host h;
+    try {
+        h.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::ContentEncoding ce;
+    try {
+        ce.parse(input);
+    } catch(...) {}
+
+    Pistache::Http::Header::ContentType ct;
+    try {
+        ct.parse(input);
+    } catch(...) {}
+
+    return 0;
+}