// SPDX-License-Identifier: GPL-2.0-or-later

#include "jp2image_int.hpp"

#include "types.hpp"

#include <cassert>

#include <cstdint>

#include <vector>

namespace Exiv2::Internal {

bool isValidBoxFileType(const std::vector<uint8_t>& boxData) {

  // BR & MinV are obligatory (4 + 4 bytes). Afterwards we have N compatibility lists (of size 4)

  if (boxData.size() < 8 || ((boxData.size() - 8u) % 4u) != 0) {

    return false;

  }

  const size_t N = (boxData.size() - 8u) / 4u;

  const uint32_t brand = getULong(boxData.data(), bigEndian);

  const uint32_t minorVersion = getULong(boxData.data() + 4, bigEndian);

  bool clWithRightBrand = false;

  for (size_t i = 0; i < N; i++) {

    uint32_t compatibilityList = getULong(boxData.data() + 8 + (i * 4), bigEndian);

    if ((brand == brandJp2 && compatibilityList == brandJp2) || (brand == brandJph && compatibilityList == brandJph)) {

      clWithRightBrand = true;

      break;

    }

  }

  return (minorVersion == 0 && clWithRightBrand);

}

}  // namespace Exiv2::Internal