CharTraits.h

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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2025 by Apryse Software Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------

#ifndef PDFTRON_H_CPPCommonCharTraits
#define PDFTRON_H_CPPCommonCharTraits

#if defined(__apple_build_version__) && __apple_build_version__ >= 17000013

#include <Common/BasicTypes.h>

#include <string.h>
#include <cwchar>
#include <ios>

namespace std
{

template<>
struct char_traits<pdftron::UInt32>
{
#if __cplusplus >= 201103L
    using char_type = pdftron::UInt32;
    using int_type = unsigned int;
    using off_type = std::streamoff;
    using pos_type = std::fpos<std::mbstate_t>;
    using state_type = std::mbstate_t;
#else
    typedef pdftron::UInt32 char_type;
    typedef unsigned int int_type;
    typedef std::streamoff off_type;
    typedef std::fpos<std::mbstate_t> pos_type;
    typedef std::mbstate_t state_type;
#endif

#if __cplusplus >= 201703L
    static constexpr void assign(char_type& left, const char_type& right) noexcept
#elif __cplusplus >= 201103L
    static void assign(char_type& left, const char_type& right) noexcept
#else
    static void assign(char_type& left, const char_type& right)
#endif
    {
        left = right;
    }

#if __cplusplus >= 202002L
    static constexpr char_type* assign(char_type* const first, std::size_t count, const char_type c)
#else
    static char_type* assign(char_type* const first, std::size_t count, const char_type c)
#endif
    {
        for (char_type* next = first; count > 0; --count, ++next)
        {
            *next = c;
        }

        return first;
    }

#if __cplusplus >= 201103L
    static constexpr bool eq(const char_type left, const char_type right) noexcept
#else
    static bool eq(const char_type left, const char_type right)
#endif
    {
        return left == right;
    }

#if __cplusplus >= 201103L
    static constexpr bool lt(const char_type left, const char_type right) noexcept
#else
    static bool lt(const char_type left, const char_type right)
#endif
    {
        return left < right;
    }

#if __cplusplus >= 202002L
    static constexpr char_type* move(char_type* const dst, const char_type* const src, const std::size_t count)
#else
    static char_type* move(char_type* const dst, const char_type* const src, const std::size_t count)
#endif
    {
        ::memmove(dst, src, count * sizeof(char_type));
        return dst;
    }

#if __cplusplus >= 202002L
    static constexpr char_type* copy(char_type* const dst, const char_type* const src, const std::size_t count)
#else
    static char_type* copy(char_type* const dst, const char_type* const src, const std::size_t count)
#endif
    {
        ::memcpy(dst, src, count * sizeof(char_type));
        return dst;
    }

#if __cplusplus >= 201703L
    static constexpr int compare(const char_type* left, const char_type* right, std::size_t count)
#else
    static int compare(const char_type* left, const char_type* right, std::size_t count)
#endif
    {
        for (; count > 0; --count, ++left, ++right)
        {
            if (!eq(*left, *right))
            {
                return lt(*left, *right) ? -1 : 1;
            }
        }

        return 0;
    }

#if __cplusplus >= 201703L
    static constexpr std::size_t length(const char_type* str)
#else
    static std::size_t length(const char_type* str)
#endif
    {
        std::size_t count = 0;
        while (*str != 0)
        {
            ++count;
            ++str;
        }

        return count;
    }

#if __cplusplus >= 201703L
    static constexpr const char_type* find(const char_type* str, std::size_t count, const char_type& c)
#else
    static const char_type* find(const char_type* str, std::size_t count, const char_type& c)
#endif
    {
        for (; count > 0; --count, ++str)
        {
            if (*str == c)
            {
                return str;
            }
        }

        return nullptr;
    }

#if __cplusplus >= 201103L
    static constexpr char_type to_char_type(const int_type i) noexcept
#else
    static char_type to_char_type(const int_type i)
#endif
    {
        return static_cast<char_type>(i);
    }

#if __cplusplus >= 201103L
    static constexpr int_type to_int_type(const char_type c) noexcept
#else
    static int_type to_int_type(const char_type c)
#endif
    {
        return static_cast<int_type>(c);
    }

#if __cplusplus >= 201103L
    static constexpr bool eq_int_type(const int_type left, const int_type right) noexcept
#else
    static bool eq_int_type(const int_type left, const int_type right)
#endif
    {
        return left == right;
    }

#if __cplusplus >= 201103L
    static constexpr int_type eof() noexcept
#else
    static int_type eof()
#endif
    {
        return static_cast<int_type>(EOF);
    }

#if __cplusplus >= 201103L
    static constexpr int_type not_eof(const int_type i) noexcept
#else
    static int_type not_eof(const int_type i)
#endif
    {
        return i != eof() ? i : !eof();
    }
};

} // namespace std

#endif

#endif // PDFTRON_H_CPPCommonCharTraits