// Copyright 2022 Google LLC.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include <libgen.h>

#include <stddef.h>

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string>

#include <fcntl.h>

#include "fuzzer_temp_file.h"

#include <magic.h>

struct Environment {

  Environment(std::string data_dir) {

    magic = magic_open(MAGIC_COMPRESS|MAGIC_CONTINUE|MAGIC_NO_COMPRESS_FORK);

    std::string magic_path = data_dir + "/magic";

    if (magic_load(magic, magic_path.c_str())) {

      fprintf(stderr, "error loading magic file: %s\n", magic_error(magic));

      exit(1);

    }

  }

  magic_t magic;

};

static Environment* env;

extern "C" int LLVMFuzzerInitialize(int* argc, char*** argv) {

  char* exe_path = (*argv)[0];

  // dirname() can modify its argument.

  char* exe_path_copy = strdup(exe_path);

  char* dir = dirname(exe_path_copy);

  env = new Environment(dir);

  free(exe_path_copy);

  return 0;

}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {

  FuzzerTemporaryFile ftf (data, size);

  int fd = open(ftf.filename(), O_RDONLY);

  magic_descriptor(env->magic, fd);

  close(fd);

  return 0;

}