// 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 <cairo.h>

#include "fuzzer_temp_file.h"

const int glyph_range = 9;

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

    if (size < glyph_range) {

        return 0;

    }

    cairo_t *cr;

    cairo_surface_t *surface;

    cairo_status_t status;

    cairo_text_extents_t extents;

    cairo_text_cluster_t cluster;

    char *tmpfile = fuzzer_get_tmpfile(data, size);

    surface = cairo_image_surface_create_from_png(tmpfile);

    status = cairo_surface_status(surface);

    if (status != CAIRO_STATUS_SUCCESS) {

        fuzzer_release_tmpfile(tmpfile);

        return 0;

    }

    char *buf = (char *) calloc(size + 1, sizeof(char));

    memcpy(buf, data, size);

    buf[size] = '\0';

    cr = cairo_create(surface);

    cairo_text_extents(cr, buf, &extents);

    cluster.num_bytes = size;

    cluster.num_glyphs = 1;

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

        // Taken from test/text-glyph-range.c

        cairo_glyph_t glyph = {

            (long int)data[i], 10 * i, 25

        };

        cairo_show_text_glyphs(cr, buf, size, &glyph, 1, &cluster, 1, 0);

    }

    cairo_destroy(cr);

    cairo_surface_destroy(surface);

    free(buf);

    fuzzer_release_tmpfile(tmpfile);

    return 0;

}