NiBinaryStream.h

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#pragma once
 
namespace RE
{
    class NiBinaryStream
    {
    public:
        inline static constexpr auto RTTI = RTTI_NiBinaryStream;
 
        using int_type = std::int32_t;
        using pos_type = std::uint32_t;
        using off_type = std::int32_t;
 
        struct BufferInfo
        {
        public:
            // members
            void*         buffer;           // 00
            std::uint32_t totalSize;        // 08
            std::uint32_t bufferAllocSize;  // 0C
            std::uint32_t bufferReadSize;   // 10
            std::uint32_t bufferPos;        // 14
            std::uint32_t streamPos;        // 18
            std::uint32_t pad1C;            // 1C
        };
        static_assert(sizeof(BufferInfo) == 0x20);
 
        NiBinaryStream();
        virtual ~NiBinaryStream();  // 00
 
        // add
        [[nodiscard]] virtual bool          good() const = 0;                    // 01
        virtual void                        seek(std::int32_t a_numBytes) = 0;   // 02
        [[nodiscard]] virtual std::uint32_t tell() const;                        // 03 - { return _absoluteCurrentPos; }
        virtual void                        get_info(BufferInfo& a_buf);         // 04
        virtual void                        set_endian_swap(bool a_doSwap) = 0;  // 05
 
        template <class CharT>
        bool get(CharT& a_ch);
        template <class CharT>
        bool read(CharT* a_str, std::uint32_t a_count);
        template <class CharT>
        bool put(CharT a_ch);
        template <class CharT>
        bool write(const CharT* a_str, std::uint32_t a_count);
 
    protected:
        using ReadFn = std::uint32_t(NiBinaryStream* a_this, void* a_buffer, std::uint32_t a_bytes, std::uint32_t* a_componentSizes, std::uint32_t a_numComponents);
        using WriteFn = std::uint32_t(NiBinaryStream* a_this, const void* a_buffer, std::uint32_t a_bytes, std::uint32_t* a_componentSizes, std::uint32_t a_numComponents);
 
        std::uint32_t binary_read(void* a_buffer, std::uint32_t a_totalBytes, std::uint32_t* a_componentSizes, std::uint32_t a_numComponents = 1);
        std::uint32_t binary_write(const void* a_buffer, std::uint32_t a_totalBytes, std::uint32_t* a_componentSizes, std::uint32_t a_numComponents = 1);
 
        // members
        std::uint32_t _absoluteCurrentPos;  // 08
        std::uint32_t _pad0C;               // 0C
        ReadFn*       _readFn;              // 10
        WriteFn*      _writeFn;             // 18
    };
    static_assert(sizeof(NiBinaryStream) == 0x20);
 
    template <class CharT>
    inline bool NiBinaryStream::get(CharT& a_ch)
    {
        return read(&a_ch, 1);
    }
 
    template <class CharT>
    inline bool NiBinaryStream::read(CharT* a_str, std::uint32_t a_count)
    {
        std::uint32_t size = sizeof(CharT);
        std::uint32_t toRead = a_count * size;
        std::uint32_t bytesRead = binary_read(a_str, toRead, &size);
        return bytesRead == toRead;
    }
 
    template <class CharT>
    inline bool NiBinaryStream::put(CharT a_ch)
    {
        return write(&a_ch, 1);
    }
 
    template <class CharT>
    inline bool NiBinaryStream::write(const CharT* a_str, std::uint32_t a_count)
    {
        std::uint32_t size = sizeof(CharT);
        std::uint32_t toWrite = a_count * size;
        std::uint32_t bytesWritten = binary_write(a_str, toWrite, &size);
        return bytesWritten == toWrite;
    }
}
 
namespace std
{
    template <class CharT, class Traits, class Allocator>
    inline bool getline(RE::NiBinaryStream& a_input, std::basic_string<CharT, Traits, Allocator>& a_str)
    {
        CharT delim = std::use_facet<std::ctype<CharT>>(std::locale()).widen('\n');
        return getline(a_input, a_str, delim);
    }
 
    template <class CharT, class Traits, class Allocator>
    inline bool getline(RE::NiBinaryStream& a_input, std::basic_string<CharT, Traits, Allocator>& a_str, CharT a_delim)
    {
        a_str.erase();
        CharT c;
        auto  notEOF = a_input.get(c);
        if (notEOF) {
            do {
                if (!std::char_traits<CharT>::eq(c, a_delim)) {
                    a_str.push_back(c);
                } else {
                    break;
                }
 
                if (a_str.size() != a_str.max_size()) {
                    notEOF = a_input.get(c);
                } else {
                    break;
                }
            } while (notEOF);
            return true;
        } else {
            return false;
        }
    }
}