Add fuzzer

CMakeLists.txt

@@ -1,22 +1,12 @@
 cmake_minimum_required (VERSION 3.11)
 
-set(git_version 0)
-find_package(Git)
-if (Git_FOUND)
-  execute_process(
-    COMMAND ${GIT_EXECUTABLE} rev-list --count HEAD
-    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-    OUTPUT_VARIABLE git_version
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-  )
-endif()
-message(STATUS "diagon git_version: ${git_version}")
-
 project(Diagon
   LANGUAGES C CXX
   VERSION 1.0.127
 )
 
+option(DIAGON_BUILD_TESTS_FUZZER "Set to ON to enable fuzzing" OFF)
+
 include(FetchContent)
 set(FETCHCONTENT_QUIET FALSE)
 
@@ -224,3 +214,7 @@ set(CPACK_DEBIAN_PACKAGE_VERSION ${PROJECT_VERSION})
 set(CPACK_RPM_PACKAGE_LICENSE MIT)
 
 include(CPack)
+
+if (DIAGON_BUILD_TESTS_FUZZER)
+  include(cmake/diagon_fuzzer.cmake)
+endif()

cmake/diagon_fuzzer.cmake

@@ -0,0 +1,8 @@
+set(CMAKE_C_COMPILER clang)
+set(CMAKE_CXX_COMPILER clang++)
+
+add_executable(fuzzer src/fuzzer.cpp)
+target_compile_options(fuzzer PRIVATE -fsanitize=fuzzer,address)
+target_link_libraries(fuzzer PRIVATE -fsanitize=fuzzer,address)
+target_link_libraries(fuzzer PRIVATE diagon_lib)
+target_set_common(fuzzer)

src/fuzzer.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+#include <string>
+#include "translator/Factory.h"
+
+int GeneratorInt(const char* data, size_t& size) {
+  if (size == 0)
+    return 0;
+  auto out = int(data[0]);
+  data++;
+  size--;
+  return out;
+}
+
+std::string GeneratorString(const char*& data, size_t& size) {
+  int index = 0;
+  while (index < size && data[index])
+    ++index;
+
+  auto out = std::string(data, data + index);
+  data += index;
+  size -= index;
+
+  return out;
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const char* data, size_t size) {
+  auto& translators = TranslatorList();
+  auto& translator = translators[GeneratorInt(data, size) % translators.size()];
+  std::string input = GeneratorString(data, size);
+  std::string options = GeneratorString(data, size);
+  if (translator->Name())
+    return 0;
+  try {
+    translator->Translate(input, options);
+  } catch (...) {
+  }
+  return 0;  // Non-zero return values are reserved for future use.
+}
+
+// Copyright 2021 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.

src/translator/sequence/Sequence.cpp

@@ -286,6 +286,8 @@ std::string Sequence::Translate(const std::string& input,
 
   ComputeInternalRepresentation(input);
   UniformizeInternalRepresentation();
+  if (actors.size() == 0)
+    return "";
   SplitByBackslashN();
   Layout();
   return Draw();
@@ -537,7 +539,8 @@ void Sequence::LayoutComputeActorsPositions() {
     spaces.push_back(space);
   }
 
-  actors[0].center = actors[0].name.size() / 2 + 1;
+  if (actors.size() != 0)
+    actors[0].center = actors[0].name.size() / 2 + 1;
 
   bool modified = true;
   int i = 0;