// Copyright 2020 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 <libexif/exif-data.h>

#include <libexif/exif-loader.h>

#include <stddef.h>

#include <stdlib.h>

/* Extract all MakerNote tags */

static void mnote_dump(ExifData *data) {

    ExifMnoteData *mn = exif_data_get_mnote_data(data);

    if (mn) {

        int num = exif_mnote_data_count(mn);

        /* Loop through all MakerNote tags */

        for (int i=0; i < num; ++i) {

            char buf[1024];

            exif_mnote_data_get_value(mn, i, buf, sizeof(buf));

        }

    }

}

static void dump_value(ExifEntry *entry, void *user_data) {

  char buf[1024];

  exif_entry_get_value(entry, buf, sizeof(buf));

}

static void data_func(ExifContent *content, void *user_data) {

  exif_content_foreach_entry(content, dump_value, NULL);

}

/* This is like exif_data_dump but without writing to stdout */

static void data_dump(ExifData *data) {

  exif_data_foreach_content(data, data_func, NULL);

}

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

  // Parse tags using (ultimately) exif_data_load_data()

  auto image = exif_data_new_from_data(data, size);

  if (image) {

    // Exercise the EXIF tag manipulation code

    exif_data_get_mnote_data(image);

    data_dump(image);

    mnote_dump(image);

    unsigned char *buf;

    unsigned int sz;

    exif_data_save_data(image, &buf, &sz);

    free(buf);

    exif_data_fix(image);

    exif_data_unref(image);

  }

  return 0;

}