// 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/hex.h

// and modified by Doris

#pragma once

#include <cstring>

#include <string>

#include "vec/core/types.h"

namespace doris::vectorized {

/// Maps 0..15 to 0..9A..F or 0..9a..f correspondingly.

extern const char* const hex_digit_to_char_uppercase_table;

extern const char* const hex_digit_to_char_lowercase_table;

inline char hex_digit_uppercase(unsigned char c) {

    return hex_digit_to_char_uppercase_table[c];

}

inline char hex_digit_lowercase(unsigned char c) {

    return hex_digit_to_char_lowercase_table[c];

}

/// Maps 0..255 to 00..FF or 00..ff correspondingly

extern const char* const hex_byte_to_char_uppercase_table;

extern const char* const hex_byte_to_char_lowercase_table;

inline void write_hex_byte_uppercase(UInt8 byte, void* out) {

    memcpy(out, &hex_byte_to_char_uppercase_table[static_cast<size_t>(byte) * 2], 2);

}

inline void write_hex_byte_lowercase(UInt8 byte, void* out) {

    memcpy(out, &hex_byte_to_char_lowercase_table[static_cast<size_t>(byte) * 2], 2);

}

extern const char* const bin_byte_to_char_table;

inline void write_bin_byte(UInt8 byte, void* out) {

    memcpy(out, &bin_byte_to_char_table[static_cast<size_t>(byte) * 8], 8);

}

/// Produces hex representation of an unsigned int with leading zeros (for checksums)

template <typename TUInt>

void write_hex_uint_impl(TUInt uint_, char* out, const char* const table) {

    union {

        TUInt value;

        UInt8 uint8[sizeof(TUInt)];

    };

    value = uint_;

    /// Use little endian

    for (size_t i = 0; i < sizeof(TUInt); ++i) {

        memcpy(out + i * 2, &table[static_cast<size_t>(uint8[sizeof(TUInt) - 1 - i]) * 2], 2);

    }

}

template <typename TUInt>

void write_hex_uint_uppercase(TUInt uint_, char* out) {

    write_hex_uint_impl(uint_, out, hex_byte_to_char_uppercase_table);

}

template <typename TUInt>

void write_hex_uint_lowercase(TUInt uint_, char* out) {

    write_hex_uint_impl(uint_, out, hex_byte_to_char_lowercase_table);

}

template <typename TUInt>

std::string get_hex_uint_uppercase(TUInt uint_) {

    std::string res(sizeof(TUInt) * 2, '\0');

    write_hex_uint_uppercase(uint_, res.data());

    return res;

}

template <typename TUInt>

std::string get_hex_uint_lowercase(TUInt uint_) {

    std::string res(sizeof(TUInt) * 2, '\0');

    write_hex_uint_lowercase(uint_, res.data());

    return res;

}

/// Maps 0..9, A..F, a..f to 0..15. Other chars are mapped to implementation specific value.

extern const char* const hex_char_to_digit_table;

inline UInt8 unhex(char c) {

    return hex_char_to_digit_table[static_cast<UInt8>(c)];

}

inline UInt8 unhex2(const char* data) {

    return static_cast<UInt8>(unhex(data[0])) * 0x10 + static_cast<UInt8>(unhex(data[1]));

}

inline UInt16 unhex4(const char* data) {

    return static_cast<UInt16>(unhex(data[0])) * 0x1000 +

           static_cast<UInt16>(unhex(data[1])) * 0x100 +

           static_cast<UInt16>(unhex(data[2])) * 0x10 + static_cast<UInt16>(unhex(data[3]));

}

template <typename TUInt>

TUInt unhex_uint(const char* data) {

    TUInt res = TUInt(0);

    if constexpr ((sizeof(TUInt) <= 8) || ((sizeof(TUInt) % 8) != 0)) {

        for (size_t i = 0; i < sizeof(TUInt) * 2; ++i, ++data) {

            res <<= 4;

            res += unhex(*data);

        }

    } else {

        for (size_t i = 0; i < sizeof(TUInt) / 8; ++i, data += 16) {

            res <<= TUInt(64);

            res += TUInt(unhex_uint<UInt64>(data));

        }

    }

    return res;

}

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TUInt unhex_uint(const char* data) {

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    TUInt res = TUInt(0);

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    if constexpr ((sizeof(TUInt) <= 8) || ((sizeof(TUInt) % 8) != 0)) {

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        for (size_t i = 0; i < sizeof(TUInt) * 2; ++i, ++data) {

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            res <<= 4;

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            res += unhex(*data);

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        }

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    } else {

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        for (size_t i = 0; i < sizeof(TUInt) / 8; ++i, data += 16) {

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            res <<= TUInt(64);

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            res += TUInt(unhex_uint<UInt64>(data));

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        }

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    }

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    return res;

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}

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TUInt unhex_uint(const char* data) {

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    TUInt res = TUInt(0);

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    if constexpr ((sizeof(TUInt) <= 8) || ((sizeof(TUInt) % 8) != 0)) {

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        for (size_t i = 0; i < sizeof(TUInt) * 2; ++i, ++data) {

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            res <<= 4;

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            res += unhex(*data);

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        }

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    } else {

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        for (size_t i = 0; i < sizeof(TUInt) / 8; ++i, data += 16) {

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            res <<= TUInt(64);

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            res += TUInt(unhex_uint<UInt64>(data));

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        }

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    }

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    return res;

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}

} // namespace doris::vectorized