test/fuzzing/standalone_fuzz_target_runner.cpp

// Copyright 2017 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");

// This runner does not do any fuzzing, but allows us to run the fuzz target
// on the test corpus or on a single file,
// e.g. the one that comes from a bug report.

#include <cstdint>
#include <fstream>
#include <iostream>
#include <vector>

// Forward declare the "fuzz target" interface.
// We deliberately keep this interface simple and header-free.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);

// It reads all files passed as parameters and feeds their contents
// one by one into the fuzz target (LLVMFuzzerTestOneInput).
int main(int argc, char **argv) {
  for (int i = 1; i < argc; i++) {
    std::ifstream in(argv[i]);
    in.seekg(0, in.end);
    size_t length = static_cast<size_t>(in.tellg());
    in.seekg(0, in.beg);
    std::cout << "Reading " << length << " bytes from " << argv[i] << std::endl;
    // Allocate exactly length bytes so that we reliably catch buffer overflows.
    std::vector<char> bytes(length);
    in.read(bytes.data(), static_cast<std::streamsize>(bytes.size()));
    LLVMFuzzerTestOneInput(reinterpret_cast<const uint8_t *>(bytes.data()),
                           bytes.size());
    std::cout << "Execution successful" << std::endl;
  }
  std::cout << "Execution finished" << std::endl;
  return 0;
}