/*

   IGraph library.

   Copyright (C) 2022  The igraph development team

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program; if not, write to the Free Software

   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

   02110-1301 USA

*/

#include "igraph.h"

#include <cstdio>

extern "C"

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

    igraph_set_error_handler(igraph_error_handler_ignore);

    igraph_set_warning_handler(igraph_warning_handler_ignore);

    // Turn on attribute handling

    igraph_set_attribute_table(&igraph_cattribute_table);

    // Create input file

    char filename[256];

    sprintf(filename, "/tmp/libfuzzer.ncol");

    FILE *fp = fopen(filename, "wb");

    if (!fp) return 0;

    fwrite(data, size, 1, fp);

    fclose(fp);

    // Read input file

    FILE *ifile;

    ifile = fopen("/tmp/libfuzzer.ncol", "r");

    if (!ifile) {

        remove(filename);

        return 0;

    }

    // Do the fuzzing

    igraph_t g;

    if (igraph_read_graph_ncol(&g, ifile, NULL, 1, IGRAPH_ADD_WEIGHTS_IF_PRESENT, IGRAPH_UNDIRECTED) == IGRAPH_SUCCESS) {

        // Clean up

        igraph_destroy(&g);

    }

    // no need to call igraph_destroy() if igraph_read_graph_ncol() returns an

    // error code as we don't have a valid graph object in that case

    fclose(ifile);

    remove(filename);

    IGRAPH_ASSERT(IGRAPH_FINALLY_STACK_EMPTY);

    return 0;

}