/*

 * Copyright 2022 Uber Technologies, Inc.

 *

 * 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.

 */

/** @file

 * @brief Fuzzer program for polygonToCells and related functions, without holes

 */

#include "aflHarness.h"

#include "h3api.h"

#include "utility.h"

const int MAX_RES = 15;

const int MAX_SZ = 4000000;

void run(GeoPolygon *geoPolygon, uint32_t flags, int res) {

    int64_t sz;

    H3Error err = H3_EXPORT(maxPolygonToCellsSize)(geoPolygon, res, flags, &sz);

    if (!err && sz < MAX_SZ) {

        H3Index *out = calloc(sz, sizeof(H3Index));

        H3_EXPORT(polygonToCells)(geoPolygon, res, flags, out);

        free(out);

    }

}

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

    if (size < sizeof(int)) {

        return 0;

    }

    uint8_t res = *data;

    size_t vertsSize = size - 1;

    int numVerts = vertsSize / sizeof(LatLng);

    GeoPolygon geoPolygon;

    geoPolygon.numHoles = 0;

    geoPolygon.holes = NULL;

    geoPolygon.geoloop.numVerts = numVerts;

    // Offset by 1 since *data was used for `res`, above.

    geoPolygon.geoloop.verts = (LatLng *)(data + 1);

    // TODO: Fuzz the `flags` input as well when it has meaningful input

    run(&geoPolygon, 0, res);

    return 0;

}

AFL_HARNESS_MAIN(sizeof(H3Index) * 1024);