/* for fmemopen */

#define _POSIX_C_SOURCE 200809L

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "cmark.h"

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

  struct __attribute__((packed)) {

    int options;

    int width;

  } fuzz_config;

  if (size >= sizeof(fuzz_config)) {

    /* The beginning of `data` is treated as fuzzer configuration */

    memcpy(&fuzz_config, data, sizeof(fuzz_config));

    int options = fuzz_config.options;

    /* Mask off valid option bits */

    options &= (CMARK_OPT_SOURCEPOS | CMARK_OPT_HARDBREAKS | CMARK_OPT_UNSAFE | CMARK_OPT_NOBREAKS | CMARK_OPT_NORMALIZE | CMARK_OPT_VALIDATE_UTF8 | CMARK_OPT_SMART);

    /* Remainder of input is the markdown */

    const char *markdown = (const char *)(data + sizeof(fuzz_config));

    size_t markdown_size = size - sizeof(fuzz_config);

    cmark_node *doc = NULL;

    /* Use upper bits of options to select parsing mode */

    switch (((unsigned) fuzz_config.options >> 30) & 3) {

      case 0:

        doc = cmark_parse_document(markdown, markdown_size, options);

        break;

      case 1:

        if (markdown_size > 0) {

          FILE *file = fmemopen((void *) markdown, markdown_size, "r");

          doc = cmark_parse_file(file, options);

          fclose(file);

        }

        break;

      case 2: {

        size_t block_max = 20;

        cmark_parser *parser = cmark_parser_new(options);

        while (markdown_size > 0) {

          size_t block_size = markdown_size > block_max ? block_max : markdown_size;

          cmark_parser_feed(parser, markdown, block_size);

          markdown += block_size;

          markdown_size -= block_size;

        }

        doc = cmark_parser_finish(parser);

        cmark_parser_free(parser);

        break;

      }

      case 3:

        free(cmark_markdown_to_html(markdown, markdown_size, options));

        break;

    }

    if (doc != NULL) {

      free(cmark_render_commonmark(doc, options, fuzz_config.width));

      free(cmark_render_html(doc, options));

      free(cmark_render_latex(doc, options, fuzz_config.width));

      free(cmark_render_man(doc, options, fuzz_config.width));

      free(cmark_render_xml(doc, options));

      cmark_node_free(doc);

    }

  }

  return 0;

}