// © 2019 and later: Unicode, Inc. and others.

// License & terms of use: http://www.unicode.org/copyright.html

// Fuzzer for ucasemap.

#include <cstring>

#include <functional>

#include <memory>

#include <stddef.h>

#include <stdint.h>

#include "fuzzer_utils.h"

#include "unicode/ucasemap.h"

template<typename T>

using deleted_unique_ptr = std::unique_ptr<T,std::function<void(T*)>>;

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

  UErrorCode status = U_ZERO_ERROR;

  uint8_t rnd8 = 0;

  uint16_t rnd16 = 0;

  uint32_t rnd32 = 0;

  if (size < 7) {

    return 0;

  }

  // Extract one, two, and four bytes from fuzzer data for random selection

  // purposes.

  rnd8 = *data;

  data++;

  rnd16 = *(reinterpret_cast<const uint16_t *>(data));

  data = data + 2;

  rnd32 = *(reinterpret_cast<const uint32_t *>(data));

  data = data + 4;

  size = size - 7;

  std::unique_ptr<char[]> fuzzbuff(new char[size]);

  std::memcpy(fuzzbuff.get(), data, size);

  const icu::Locale& locale = GetRandomLocale(rnd16);

  uint32_t open_flags = rnd32;

  deleted_unique_ptr<UCaseMap> csm(

      ucasemap_open(locale.getName(), open_flags, &status),

      [](UCaseMap* map) { ucasemap_close(map); });

  if (U_FAILURE(status)) {

    return 0;

  }

  int32_t dst_size = size * 2;

  std::unique_ptr<char[]> dst(new char[dst_size]);

  const auto* src = reinterpret_cast<const char*>(fuzzbuff.get());

  switch (rnd8 % 4) {

    case 0: ucasemap_utf8ToLower(csm.get(), dst.get(), dst_size, src, size,

                &status);

            break;

    case 1: ucasemap_utf8ToUpper(csm.get(), dst.get(), dst_size, src, size,

                &status);

            break;

    case 2: ucasemap_utf8ToTitle(csm.get(), dst.get(), dst_size, src, size,

                &status);

            break;

    case 3: ucasemap_utf8FoldCase(csm.get(), dst.get(), dst_size, src, size,

                &status);

            break;

  }

  return 0;

}