#include <stdio.h>

#include <string.h>

#include <cstdint>

#include <vorbis/vorbisfile.h>

struct vorbis_data {

  const uint8_t *current;

  const uint8_t *data;

  size_t size;

};

size_t read_func(void *ptr, size_t size1, size_t size2, void *datasource) {

  vorbis_data* vd = (vorbis_data *)(datasource);

  size_t len = size1 * size2;

  if (vd->current + len > vd->data + vd->size) {

      len = vd->data + vd->size - vd->current;

  }

  memcpy(ptr, vd->current, len);

  vd->current += len;

  return len;

}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {

  ov_callbacks memory_callbacks = {0};

  memory_callbacks.read_func = read_func;

  vorbis_data data_st;

  data_st.size = Size;

  data_st.current = Data;

  data_st.data = Data;

  OggVorbis_File vf;

  int result = ov_open_callbacks(&data_st, &vf, NULL, 0, memory_callbacks);

  if (result < 0) {

    return 0;

  }

  int current_section = 0;

  int eof = 0;

  char buf[4096];

  int read_result;

  while (!eof) {

    read_result = ov_read(&vf, buf, sizeof(buf), 0, 2, 1, &current_section);

    if (read_result != OV_HOLE && read_result <= 0) {

      eof = 1;

    }

  }

  ov_clear(&vf);

  return 0;

}