libddwaf-src 2.1.0

Source distribution and build integration for DataDog/libddwaf
Documentation 
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// Unless explicitly stated otherwise all files in this repository are
// dual-licensed under the Apache-2.0 License or BSD-3-Clause License.
//
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2021 Datadog, Inc.

#pragma once

#include <compare> // IWYU pragma: keep
#include <cstdint>
#include <string>
#include <string_view>
#include <type_traits>

namespace ddwaf {

enum class object_type : uint8_t {
    // Default / Invalid
    invalid = 0x00, // 0b00000000
    // Null value
    null = 0x01, // 0b00000001
    // Scalars
    boolean = 0x02,        // 0b00000010
    int64 = 0x04,          // 0b00000100
    uint64 = 0x06,         // 0b00000110
    float64 = 0x08,        // 0b00001000
    string = 0x10,         // 0b00010000
    literal_string = 0x12, // 0b00010010
    small_string = 0x14,   // 0b00010100
    // Containers
    array = 0x20,    // 0b00100000
    map = 0x40,      // 0b01000000
    hash_map = 0x60, // 0b01100000

    large_array = 0xA0, // 0b10100000
    large_map = 0xC0,   // 0b11000000
};

constexpr uint8_t logical_container_type_mask = 0x7f;

template <typename T>
constexpr object_type operator|(object_type left, T right)
    requires std::is_same_v<T, object_type> || std::is_integral_v<T>
{
    using utype = std::underlying_type_t<object_type>;
    return static_cast<object_type>(static_cast<utype>(left) | static_cast<utype>(right));
}

template <typename T>
constexpr object_type operator&(object_type left, T right)
    requires std::is_same_v<T, object_type> || std::is_integral_v<T>
{
    using utype = std::underlying_type_t<object_type>;
    return static_cast<object_type>(static_cast<utype>(left) & static_cast<utype>(right));
}

template <typename T>
constexpr auto operator<=>(object_type left, T right)
    requires std::is_same_v<T, object_type> || std::is_integral_v<T>
{
    using utype = std::underlying_type_t<object_type>;
    return static_cast<utype>(left) <=> static_cast<utype>(right);
}

template <typename T>
constexpr bool operator==(object_type left, T right)
    requires std::is_same_v<T, object_type> || std::is_integral_v<T>
{
    using utype = std::underlying_type_t<object_type>;
    return static_cast<utype>(left) == static_cast<utype>(right);
}

inline bool is_scalar(object_type type)
{
    return (type & (object_type::boolean | object_type::int64 | object_type::uint64 |
                       object_type::float64 | object_type::string | object_type::literal_string |
                       object_type::small_string)) != 0;
}

inline bool is_array(object_type type)
{
    return (static_cast<uint8_t>(type) & logical_container_type_mask) ==
           static_cast<uint8_t>(object_type::array);
}

inline bool is_map(object_type type)
{
    return (static_cast<uint8_t>(type) & logical_container_type_mask) ==
           static_cast<uint8_t>(object_type::map);
}

inline bool is_container(object_type type)
{
    return is_array(type) || is_map(type) || type == object_type::hash_map;
}

template <typename T> inline bool is_compatible_type(object_type /*type*/) { return false; }

template <typename T>
inline bool is_compatible_type(object_type type)
    requires std::is_same_v<T, bool>
{
    return type == object_type::boolean;
}

template <typename T>
inline bool is_compatible_type(object_type type)
    requires std::is_same_v<T, uint64_t>
{
    return type == object_type::uint64;
}

template <typename T>
inline bool is_compatible_type(object_type type)
    requires std::is_same_v<T, int64_t>
{
    return type == object_type::int64;
}

template <typename T>
inline bool is_compatible_type(object_type type)
    requires std::is_same_v<T, double>
{
    return type == object_type::float64;
}

template <typename T>
inline bool is_compatible_type(object_type type)
    requires std::is_same_v<T, std::string> || std::is_same_v<T, std::string_view> ||
             std::is_same_v<T, const char *>
{
    return (type & object_type::string) != 0;
}

template <typename T>
T object_type_to_string(object_type type)
    requires std::is_constructible_v<T, const char *>
{
    switch (type) {
    case object_type::map:
    case object_type::large_map:
        return "map";
    case object_type::array:
    case object_type::large_array:
        return "array";
    case object_type::string:
    case object_type::literal_string:
    case object_type::small_string:
        return "string";
    case object_type::boolean:
        return "bool";
    case object_type::uint64:
        return "unsigned";
    case object_type::int64:
        return "signed";
    case object_type::float64:
        return "float";
    case object_type::null:
        return "null";
    case object_type::invalid:
    default:
        break;
    }
    return "unknown";
}

} // namespace ddwaf