/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * Interface definitions for the unified fuzzing interface
 */

#ifndef FuzzingInterface_h__
#define FuzzingInterface_h__

#include <fstream>

#ifdef LIBFUZZER
#  include "FuzzerExtFunctions.h"
#endif

#include "FuzzerRegistry.h"
#include "mozilla/Assertions.h"

#ifndef JS_STANDALONE
#  include "mozilla/Logging.h"
#endif

namespace mozilla {

#ifdef JS_STANDALONE
void fuzzing_log(const char* aFmt, ...);
#  define MOZ_LOG_EXPAND_ARGS(...) __VA_ARGS__

#  define FUZZING_LOG(args) fuzzing_log(MOZ_LOG_EXPAND_ARGS args);
#else
extern LazyLogModule gFuzzingLog;

#  define FUZZING_LOG(args) \
    MOZ_LOG(mozilla::gFuzzingLog, mozilla::LogLevel::Verbose, args)
#endif  // JS_STANDALONE

typedef int (*FuzzingTestFuncRaw)(const uint8_t*, size_t);

#ifdef AFLFUZZ

static int afl_interface_raw(const char* testFile,
                             FuzzingTestFuncRaw testFunc) {
  char* buf = NULL;

  while (__AFL_LOOP(1000)) {
    std::ifstream is;
    is.open(testFile, std::ios::binary);
    is.seekg(0, std::ios::end);
    int len = is.tellg();
    is.seekg(0, std::ios::beg);
    MOZ_RELEASE_ASSERT(len >= 0);
    if (!len) {
      is.close();
      continue;
    }
    buf = (char*)realloc(buf, len);
    MOZ_RELEASE_ASSERT(buf);
    is.read(buf, len);
    is.close();
    testFunc((uint8_t*)buf, (size_t)len);
  }

  free(buf);

  return 0;
}

#  define MOZ_AFL_INTERFACE_COMMON()                                      \
    char* testFilePtr = getenv("MOZ_FUZZ_TESTFILE");                      \
    if (!testFilePtr) {                                                   \
      fprintf(stderr,                                                     \
              "Must specify testfile in MOZ_FUZZ_TESTFILE environment "   \
              "variable.\n");                                             \
      return 1;                                                           \
    }                                                                     \
    /* Make a copy of testFilePtr so the testing function can safely call \
     * getenv                                                             \
     */                                                                   \
    std::string testFile(testFilePtr);

#  define MOZ_AFL_INTERFACE_RAW(initFunc, testFunc, moduleName)          \
    static int afl_fuzz_##moduleName(const uint8_t* data, size_t size) { \
      MOZ_RELEASE_ASSERT(data == NULL && size == 0);                     \
      MOZ_AFL_INTERFACE_COMMON();                                        \
      return ::mozilla::afl_interface_raw(testFile.c_str(), testFunc);   \
    }                                                                    \
    static void __attribute__((constructor)) AFLRegister##moduleName() { \
      ::mozilla::FuzzerRegistry::getInstance().registerModule(           \
          #moduleName, initFunc, afl_fuzz_##moduleName);                 \
    }
#else
#  define MOZ_AFL_INTERFACE_RAW(initFunc, testFunc, moduleName) /* Nothing */
#endif                                                          // AFLFUZZ

#ifdef LIBFUZZER
#  define MOZ_LIBFUZZER_INTERFACE_RAW(initFunc, testFunc, moduleName)          \
    static void __attribute__((constructor)) LibFuzzerRegister##moduleName() { \
      ::mozilla::FuzzerRegistry::getInstance().registerModule(                 \
          #moduleName, initFunc, testFunc);                                    \
    }
#else
#  define MOZ_LIBFUZZER_INTERFACE_RAW(initFunc, testFunc, \
                                      moduleName) /* Nothing */
#endif

#define MOZ_FUZZING_INTERFACE_RAW(initFunc, testFunc, moduleName) \
  MOZ_LIBFUZZER_INTERFACE_RAW(initFunc, testFunc, moduleName);    \
  MOZ_AFL_INTERFACE_RAW(initFunc, testFunc, moduleName);

}  // namespace mozilla

#endif  // FuzzingInterface_h__
