// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

// This file is copied from

// https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/IPv6ToBinary.cpp

// and modified by Doris

#pragma once

#include <algorithm>

#include "exec/common/format_ip.h"

namespace doris {

/// Result array could be indexed with all possible uint8 values without extra check.

/// For values greater than 128 we will store same value as for 128 (all bits set).

constexpr size_t IPV6_MASKS_COUNT = 256;

using RawMaskArrayV6 = std::array<uint8_t, IPV6_BINARY_LENGTH>;

static constexpr RawMaskArrayV6 generate_bit_mask(size_t prefix) {

    RawMaskArrayV6 arr {0};

    prefix = std::min(prefix, arr.size() * 8);

    int8_t i = IPV6_BINARY_LENGTH - 1;

    for (; prefix >= 8; --i, prefix -= 8) {

        arr[i] = 0xff;

    }

    if (prefix > 0) {

        arr[i--] = static_cast<uint8_t>(~(0xff >> prefix));

    }

    while (i >= 0) {

        arr[i--] = 0x00;

    }

    return arr;

}

Unexecuted instantiation: column_ip_test.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: ip_value_test.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: dictionary_get_nullable_test.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: dictionary_ip_trie_test.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: function_ip_dict_test.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: function_ip_test.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: function_ip.cpp:_ZN5dorisL17generate_bit_maskEm

Unexecuted instantiation: ip_address_dictionary.cpp:_ZN5dorisL17generate_bit_maskEm

static constexpr std::array<RawMaskArrayV6, IPV6_MASKS_COUNT> generate_bit_masks() {

    std::array<RawMaskArrayV6, IPV6_MASKS_COUNT> arr {};

    for (size_t i = 0; i < IPV6_MASKS_COUNT; ++i) {

        arr[i] = generate_bit_mask(i);

    }

    return arr;

}

Unexecuted instantiation: column_ip_test.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: ip_value_test.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: dictionary_get_nullable_test.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: dictionary_ip_trie_test.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: function_ip_dict_test.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: function_ip_test.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: function_ip.cpp:_ZN5dorisL18generate_bit_masksEv

Unexecuted instantiation: ip_address_dictionary.cpp:_ZN5dorisL18generate_bit_masksEv

/// Returns a reference to 16-byte array containing mask with first `prefix_len` bits set to `1` and `128 - prefix_len` to `0`.

/// Store in little-endian byte order

/// The reference is valid during all program execution time.

/// Values of prefix_len greater than 128 interpreted as 128 exactly.

inline const std::array<uint8_t, 16>& get_cidr_mask_ipv6(uint8_t prefix_len) {

    static constexpr auto IPV6_RAW_MASK_ARRAY = generate_bit_masks();

    return IPV6_RAW_MASK_ARRAY[prefix_len];

}

} // namespace doris