PacketUtilities.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef PacketUtilities_h__
#define PacketUtilities_h__
 
#include "ByteBuffer.h"
#include "Tuples.h"
#include <short_alloc/short_alloc.h>
#include <string_view>
 
namespace WorldPackets
{
    class InvalidStringValueException : public ByteBufferInvalidValueException
    {
    public:
        InvalidStringValueException(std::string const& value);
 
        std::string const& GetInvalidValue() const { return _value; }
 
    private:
        std::string _value;
    };
 
    class InvalidUtf8ValueException : public InvalidStringValueException
    {
    public:
        InvalidUtf8ValueException(std::string const& value);
    };
 
    class InvalidHyperlinkException : public InvalidStringValueException
    {
    public:
        InvalidHyperlinkException(std::string const& value);
    };
 
    class IllegalHyperlinkException : public InvalidStringValueException
    {
    public:
        IllegalHyperlinkException(std::string const& value);
    };
 
    namespace Strings
    {
        struct RawBytes { static bool Validate(std::string const& /*value*/) { return true; } };
        template<std::size_t MaxBytesWithoutNullTerminator>
        struct ByteSize { static bool Validate(std::string const& value) { return value.size() <= MaxBytesWithoutNullTerminator; } };
        struct Utf8 { static bool Validate(std::string const& value); };
        struct Hyperlinks { static bool Validate(std::string const& value); };
        struct NoHyperlinks { static bool Validate(std::string const& value); };
    }
 
    template<std::size_t MaxBytesWithoutNullTerminator, typename... Validators>
    class String
    {
        using ValidatorList = std::conditional_t<!Trinity::has_type<Strings::RawBytes, std::tuple<Validators...>>::value,
            std::tuple<Strings::ByteSize<MaxBytesWithoutNullTerminator>, Strings::Utf8, Validators...>,
            std::tuple<Strings::ByteSize<MaxBytesWithoutNullTerminator>, Validators...>>;
 
    public:
        bool empty() const { return _storage.empty(); }
        char const* c_str() const { return _storage.c_str(); }
 
        operator std::string_view() const { return _storage; }
        operator std::string&() { return _storage; }
        operator std::string const&() const { return _storage; }
 
        std::string&& Move() { return std::move(_storage); }
 
        friend ByteBuffer& operator>>(ByteBuffer& data, String& value)
        {
            value._storage = data.ReadCString(false);
            value.Validate();
            return data;
        }
 
    private:
        bool Validate() const
        {
            return ValidateNth(std::make_index_sequence<std::tuple_size_v<ValidatorList>>{});
        }
 
        template<std::size_t... indexes>
        bool ValidateNth(std::index_sequence<indexes...>) const
        {
            return (std::tuple_element_t<indexes, ValidatorList>::Validate(_storage) && ...);
        }
 
        std::string _storage;
    };
 
    class PacketArrayMaxCapacityException : public ByteBufferException
    {
    public:
        PacketArrayMaxCapacityException(std::size_t requestedSize, std::size_t sizeLimit);
    };
 
    template<typename T, std::size_t N>
    class Array
    {
    public:
        using allocator_type = short_alloc::short_alloc<T, (N * sizeof(T) + (alignof(std::max_align_t) - 1)) & ~(alignof(std::max_align_t) - 1)>;
        using arena_type = typename allocator_type::arena_type;
 
        using storage_type = std::vector<T, allocator_type>;
 
        using max_capacity = std::integral_constant<std::size_t, N>;
 
        using value_type = typename storage_type::value_type;
        using size_type = typename storage_type::size_type;
        using pointer = typename storage_type::pointer;
        using const_pointer = typename storage_type::const_pointer;
        using reference = typename storage_type::reference;
        using const_reference = typename storage_type::const_reference;
        using iterator = typename storage_type::iterator;
        using const_iterator = typename storage_type::const_iterator;
 
        Array() : _storage(_data) { }
 
        Array(Array const& other) : Array()
        {
            for (T const& element : other)
                _storage.push_back(element);
        }
 
        Array(Array&& other) noexcept = delete;
 
        Array& operator=(Array const& other)
        {
            if (this == &other)
                return *this;
 
            _storage.clear();
            for (T const& element : other)
                _storage.push_back(element);
 
            return *this;
        }
 
        Array& operator=(Array&& other) noexcept = delete;
 
        iterator begin() { return _storage.begin(); }
        const_iterator begin() const { return _storage.begin(); }
 
        iterator end() { return _storage.end(); }
        const_iterator end() const { return _storage.end(); }
 
        pointer data() { return _storage.data(); }
        const_pointer data() const { return _storage.data(); }
 
        size_type size() const { return _storage.size(); }
        bool empty() const { return _storage.empty(); }
 
        reference operator[](size_type i) { return _storage[i]; }
        const_reference operator[](size_type i) const { return _storage[i]; }
 
        void resize(size_type newSize)
        {
            if (newSize > max_capacity::value)
                throw PacketArrayMaxCapacityException(newSize, max_capacity::value);
 
            _storage.resize(newSize);
        }
 
        void push_back(value_type const& value)
        {
            if (_storage.size() >= max_capacity::value)
                throw PacketArrayMaxCapacityException(_storage.size() + 1, max_capacity::value);
 
            _storage.push_back(value);
        }
 
        void push_back(value_type&& value)
        {
            if (_storage.size() >= max_capacity::value)
                throw PacketArrayMaxCapacityException(_storage.size() + 1, max_capacity::value);
 
            _storage.push_back(std::forward<value_type>(value));
        }
 
        template<typename... Args>
        T& emplace_back(Args&&... args)
        {
            _storage.emplace_back(std::forward<Args>(args)...);
            return _storage.back();
        }
 
        iterator erase(const_iterator first, const_iterator last)
        {
            return _storage.erase(first, last);
        }
 
        void clear()
        {
            _storage.clear();
        }
 
    private:
        arena_type _data;
        storage_type _storage;
    };
}
 
#endif // PacketUtilities_h__