unaligned_type.h

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/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2022 John Wellbelove
 
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#ifndef ETL_UNALIGNED_TYPE_INCLUDED
#define ETL_UNALIGNED_TYPE_INCLUDED
 
 
#include "platform.h"
#include "type_traits.h"
#include "endianness.h"
#include "iterator.h"
#include "algorithm.h"
 
#include <string.h>
 
namespace etl
{
  namespace private_unaligned_type
  {
    //*************************************************************************
    //*************************************************************************
    template <size_t Size_>
    class unaligned_type_common
    {
    public:
 
      static ETL_CONSTANT size_t Size = Size_;
 
      typedef unsigned char                         storage_type;
      typedef storage_type* pointer;
      typedef const storage_type* const_pointer;
      typedef storage_type* iterator;
      typedef const storage_type* const_iterator;
      typedef etl::reverse_iterator<iterator>       reverse_iterator;
      typedef etl::reverse_iterator<const_iterator> const_reverse_iterator;
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR unaligned_type_common()
        : storage()
      {
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR size_t size() const
      {
        return Size;
      }
 
      //*************************************************************************
      //*************************************************************************
      pointer data()
      {
        return storage;
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR const_pointer data() const
      {
        return storage;
      }
 
      //*************************************************************************
      //*************************************************************************
      iterator begin()
      {
        return iterator(storage);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR const_iterator begin() const
      {
        return const_iterator(storage);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR const_iterator cbegin() const
      {
        return const_iterator(storage);
      }
 
      //*************************************************************************
      //*************************************************************************
      reverse_iterator rbegin()
      {
        return reverse_iterator(storage + Size);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 const_reverse_iterator rbegin() const
      {
        return const_reverse_iterator(storage + Size);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 const_reverse_iterator crbegin() const
      {
        return const_reverse_iterator(storage + Size);
      }
 
      //*************************************************************************
      //*************************************************************************
      iterator end()
      {
        return iterator(storage + Size);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR const_iterator end() const
      {
        return const_iterator(storage + Size);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR const_iterator cend() const
      {
        return const_iterator(storage + Size);
      }
 
      //*************************************************************************
      //*************************************************************************
      reverse_iterator rend()
      {
        return reverse_iterator(storage);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 const_reverse_iterator rend() const
      {
        return const_reverse_iterator(storage);
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR14 const_reverse_iterator crend() const
      {
        return const_reverse_iterator(storage);
      }
 
      //*************************************************************************
      //*************************************************************************
      storage_type& operator[](int i)
      {
        return storage[i];
      }
 
      //*************************************************************************
      //*************************************************************************
      ETL_CONSTEXPR const storage_type& operator[](int i) const
      {
        return storage[i];
      }
 
    protected:
 
      unsigned char storage[Size];
    };
 
    template <size_t Size_>
    ETL_CONSTANT size_t unaligned_type_common<Size_>::Size;
  }
 
  //*************************************************************************
  //*************************************************************************
  template <typename T, int Endian_>
  class unaligned_type : public private_unaligned_type::unaligned_type_common<sizeof(T)>
  {
  public:
 
    ETL_STATIC_ASSERT(etl::is_integral<T>::value || etl::is_floating_point<T>::value, "Unaligned type must be integral or floating point");
 
    typedef T value_type;
 
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::storage_type           storage_type;
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::pointer                pointer;
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::const_pointer          const_pointer;
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::iterator               iterator;
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::const_iterator         const_iterator;
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::reverse_iterator       reverse_iterator;
    typedef typename private_unaligned_type::unaligned_type_common<sizeof(T)>::const_reverse_iterator const_reverse_iterator;
 
    static ETL_CONSTANT int Endian = Endian_;
    static ETL_CONSTANT size_t Size = private_unaligned_type::unaligned_type_common<sizeof(T)>::Size;
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR unaligned_type()
    {
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 unaligned_type(T value)
    {
      unaligned_copy<T>::copy(value, this->storage);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <int Endian_Other>
    ETL_CONSTEXPR14 unaligned_type(const unaligned_type<T, Endian_Other>& other)
    {
      unaligned_copy<T>::copy(other.data(), Endian_Other, this->storage);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 unaligned_type& operator =(T value)
    {
      unaligned_copy<T>::copy(value, this->storage);
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <int Endian_Other>
    ETL_CONSTEXPR14 unaligned_type& operator =(const unaligned_type<T, Endian_Other>& other)
    {
      unaligned_copy<T>::copy(other.data(), Endian_Other, this->storage);
 
      return *this;
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator ==(const unaligned_type& lhs, const unaligned_type& rhs)
    {
      return etl::equal(lhs.data(), lhs.data() + lhs.Size, rhs.data());
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator ==(const unaligned_type& lhs, T rhs)
    {
      T lhs_value = lhs;
      return (lhs_value == rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator ==(T lhs, const unaligned_type& rhs)
    {
      T rhs_value = rhs;
      return (lhs == rhs_value);
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator !=(const unaligned_type& lhs, T rhs)
    {
      return !(lhs == rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator !=(const unaligned_type& lhs, const unaligned_type& rhs)
    {
      return !(lhs == rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    friend ETL_CONSTEXPR14 bool operator !=(T lhs, const unaligned_type& rhs)
    {
      return !(lhs == rhs);
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 operator T() const
    {
      T value = T();
 
      unaligned_copy<T>::copy(this->storage, value);
 
      return value;
    }
 
    //*************************************************************************
    //*************************************************************************
    ETL_CONSTEXPR14 T value() const
    {
      T value = T();
 
      unaligned_copy<T>::copy(this->storage, value);
 
      return value;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <typename U, size_t Size = sizeof(U)>
    struct unaligned_copy;
 
    //*******************************************
    //*******************************************
    template <typename U>
    struct unaligned_copy<U, 1U>
    {
      //*******************************
      static ETL_CONSTEXPR14 void copy(T value, pointer store)
      {
        store[0] = static_cast<storage_type>(value);
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer store, T& value)
      {
        value = static_cast<T>(store[0]);
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer src, int /*endian_src*/, unsigned char* dst)
      {
        dst[0] = src[0];
      }
    };
 
    //*******************************************
    //*******************************************
    template <typename U>
    struct unaligned_copy<U, 2U>
    {
      //*******************************
      static ETL_CONSTEXPR14 void copy(T value, unsigned char* store)
      {
        if (Endian == etl::endianness::value())
        {
          store[0] = static_cast<storage_type>(value);
          store[1] = static_cast<storage_type>(value >> (1U * CHAR_BIT));
        }
        else
        {
          store[1] = static_cast<storage_type>(value);
          store[0] = static_cast<storage_type>(value >> (1U * CHAR_BIT));
        }
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer store, T& value)
      {
        if (Endian == etl::endianness::value())
        {
          value = static_cast<T>(static_cast<unsigned char>(store[0]));
          value |= static_cast<T>(static_cast<unsigned char>(store[1])) << (1U * CHAR_BIT);
        }
        else
        {
          value = static_cast<T>(static_cast<unsigned char>(store[1]));
          value |= static_cast<T>(static_cast<unsigned char>(store[0])) << (1U * CHAR_BIT);
        }
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer src, int endian_src, unsigned char* dst)
      {
        if (Endian == endian_src)
        {
          dst[0] = src[0];
          dst[1] = src[1];
        }
        else
        {
          dst[0] = src[1];
          dst[1] = src[0];
        }
      }
    };
 
    //*******************************************
    //*******************************************
    template <typename U>
    struct unaligned_copy<U, 4U>
    {
      static ETL_CONSTEXPR14 void copy(T value, unsigned char* store)
      {
        if (Endian == etl::endianness::value())
        {
          store[0] = static_cast<storage_type>(value);
          store[1] = static_cast<storage_type>(value >> (1U * CHAR_BIT));
          store[2] = static_cast<storage_type>(value >> (2U * CHAR_BIT));
          store[3] = static_cast<storage_type>(value >> (3U * CHAR_BIT));
        }
        else
        {
          store[3] = static_cast<storage_type>(value);
          store[2] = static_cast<storage_type>(value >> (1U * CHAR_BIT));
          store[1] = static_cast<storage_type>(value >> (2U * CHAR_BIT));
          store[0] = static_cast<storage_type>(value >> (3U * CHAR_BIT));
        }
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer store, T& value)
      {
        if (Endian == etl::endianness::value())
        {
          value = static_cast<T>(static_cast<unsigned char>(store[0]));
          value |= static_cast<T>(static_cast<unsigned char>(store[1])) << (1U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[2])) << (2U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[3])) << (3U * CHAR_BIT);
        }
        else
        {
          value = static_cast<T>(static_cast<unsigned char>(store[3]));
          value |= static_cast<T>(static_cast<unsigned char>(store[2])) << (1U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[1])) << (2U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[0])) << (3U * CHAR_BIT);
        }
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer src, int endian_src, unsigned char* dst)
      {
        if (Endian == endian_src)
        {
          dst[0] = src[0];
          dst[1] = src[1];
          dst[2] = src[2];
          dst[3] = src[3];
        }
        else
        {
          dst[0] = src[3];
          dst[1] = src[2];
          dst[2] = src[1];
          dst[3] = src[0];
        }
      }
    };
 
    //*******************************************
    //*******************************************
    template <typename U>
    struct unaligned_copy<U, 8U>
    {
      static ETL_CONSTEXPR14 void copy(T value, unsigned char* store)
      {
        if (Endian == etl::endianness::value())
        {
          store[0] = static_cast<storage_type>(value);
          store[1] = static_cast<storage_type>(value >> (1U * CHAR_BIT));
          store[2] = static_cast<storage_type>(value >> (2U * CHAR_BIT));
          store[3] = static_cast<storage_type>(value >> (3U * CHAR_BIT));
          store[4] = static_cast<storage_type>(value >> (4U * CHAR_BIT));
          store[5] = static_cast<storage_type>(value >> (5U * CHAR_BIT));
          store[6] = static_cast<storage_type>(value >> (6U * CHAR_BIT));
          store[7] = static_cast<storage_type>(value >> (7U * CHAR_BIT));
        }
        else
        {
          store[7] = static_cast<storage_type>(value);
          store[6] = static_cast<storage_type>(value >> (1U * CHAR_BIT));
          store[5] = static_cast<storage_type>(value >> (2U * CHAR_BIT));
          store[4] = static_cast<storage_type>(value >> (3U * CHAR_BIT));
          store[3] = static_cast<storage_type>(value >> (4U * CHAR_BIT));
          store[2] = static_cast<storage_type>(value >> (5U * CHAR_BIT));
          store[1] = static_cast<storage_type>(value >> (6U * CHAR_BIT));
          store[0] = static_cast<storage_type>(value >> (7U * CHAR_BIT));
        }
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer store, T& value)
      {
        if (Endian == etl::endianness::value())
        {
          value = static_cast<T>(static_cast<unsigned char>(store[0]));
          value |= static_cast<T>(static_cast<unsigned char>(store[1])) << (1U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[2])) << (2U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[3])) << (3U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[4])) << (4U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[5])) << (5U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[6])) << (6U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[7])) << (7U * CHAR_BIT);
        }
        else
        {
          value = static_cast<T>(static_cast<unsigned char>(store[7]));
          value |= static_cast<T>(static_cast<unsigned char>(store[6])) << (1U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[5])) << (2U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[4])) << (3U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[3])) << (4U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[2])) << (5U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[1])) << (6U * CHAR_BIT);
          value |= static_cast<T>(static_cast<unsigned char>(store[0])) << (7U * CHAR_BIT);
        }
      }
 
      //*******************************
      static ETL_CONSTEXPR14 void copy(const_pointer src, int endian_src, unsigned char* dst)
      {
        if (Endian == endian_src)
        {
          dst[0] = src[0];
          dst[1] = src[1];
          dst[2] = src[2];
          dst[3] = src[3];
          dst[4] = src[4];
          dst[5] = src[5];
          dst[6] = src[6];
          dst[7] = src[7];
        }
        else
        {
          dst[0] = src[7];
          dst[1] = src[6];
          dst[2] = src[5];
          dst[3] = src[4];
          dst[4] = src[3];
          dst[5] = src[2];
          dst[6] = src[1];
          dst[7] = src[0];
        }
      }
    };
  };
 
  template <typename T, int Endian_>
  ETL_CONSTANT int unaligned_type<T, Endian_>::Endian;
    
  template <typename T, int Endian_>
  ETL_CONSTANT size_t unaligned_type<T, Endian_>::Size;
 
#if ETL_HAS_CONSTEXPR_ENDIANNESS
  // Host order
  typedef unaligned_type<char, etl::endianness::value()> host_char_t;
  typedef unaligned_type<signed char, etl::endianness::value()> host_schar_t;
  typedef unaligned_type<unsigned char, etl::endianness::value()> host_uchar_t;
  typedef unaligned_type<short, etl::endianness::value()> host_short_t;
  typedef unaligned_type<unsigned short, etl::endianness::value()> host_ushort_t;
  typedef unaligned_type<int, etl::endianness::value()> host_int_t;
  typedef unaligned_type<unsigned int, etl::endianness::value()> host_uint_t;
  typedef unaligned_type<long, etl::endianness::value()> host_long_t;
  typedef unaligned_type<unsigned long, etl::endianness::value()> host_ulong_t;
  typedef unaligned_type<long long, etl::endianness::value()> host_long_long_t;
  typedef unaligned_type<unsigned long long, etl::endianness::value()> host_ulong_long_t;
#if ETL_USING_8BIT_TYPES
  typedef unaligned_type<int8_t, etl::endianness::value()> host_int8_t;
  typedef unaligned_type<uint8_t, etl::endianness::value()> host_uint8_t;
#endif
  typedef unaligned_type<int16_t, etl::endianness::value()> host_int16_t;
  typedef unaligned_type<uint16_t, etl::endianness::value()> host_uint16_t;
  typedef unaligned_type<int32_t, etl::endianness::value()> host_int32_t;
  typedef unaligned_type<uint32_t, etl::endianness::value()> host_uint32_t;
#if ETL_USING_64BIT_TYPES
  typedef unaligned_type<int64_t, etl::endianness::value()> host_int64_t;
  typedef unaligned_type<uint64_t, etl::endianness::value()> host_uint64_t;
#endif
  typedef unaligned_type<float, etl::endianness::value()> host_float_t;
  typedef unaligned_type<double, etl::endianness::value()> host_double_t;
  typedef unaligned_type<long double, etl::endianness::value()> host_long_double_t;
#endif
 
  // Little Endian
  typedef unaligned_type<char, etl::endian::little> le_char_t;
  typedef unaligned_type<signed char, etl::endian::little> le_schar_t;
  typedef unaligned_type<unsigned char, etl::endian::little> le_uchar_t;
  typedef unaligned_type<short, etl::endian::little> le_short_t;
  typedef unaligned_type<unsigned short, etl::endian::little> le_ushort_t;
  typedef unaligned_type<int, etl::endian::little> le_int_t;
  typedef unaligned_type<unsigned int, etl::endian::little> le_uint_t;
  typedef unaligned_type<long, etl::endian::little> le_long_t;
  typedef unaligned_type<unsigned long, etl::endian::little> le_ulong_t;
  typedef unaligned_type<long long, etl::endian::little> le_long_long_t;
  typedef unaligned_type<unsigned long long, etl::endian::little> le_ulong_long_t;
#if ETL_USING_8BIT_TYPES
  typedef unaligned_type<int8_t, etl::endian::little> le_int8_t;
  typedef unaligned_type<uint8_t, etl::endian::little> le_uint8_t;
#endif
  typedef unaligned_type<int16_t, etl::endian::little> le_int16_t;
  typedef unaligned_type<uint16_t, etl::endian::little> le_uint16_t;
  typedef unaligned_type<int32_t, etl::endian::little> le_int32_t;
  typedef unaligned_type<uint32_t, etl::endian::little> le_uint32_t;
#if ETL_USING_64BIT_TYPES
  typedef unaligned_type<int64_t, etl::endian::little> le_int64_t;
  typedef unaligned_type<uint64_t, etl::endian::little> le_uint64_t;
#endif
  typedef unaligned_type<float, etl::endian::little> le_float_t;
  typedef unaligned_type<double, etl::endian::little> le_double_t;
  typedef unaligned_type<long double, etl::endian::little> le_long_double_t;
 
  // Big Endian
  typedef unaligned_type<char, etl::endian::big> be_char_t;
  typedef unaligned_type<signed char, etl::endian::big> be_schar_t;
  typedef unaligned_type<unsigned char, etl::endian::big> be_uchar_t;
  typedef unaligned_type<short, etl::endian::big> be_short_t;
  typedef unaligned_type<unsigned short, etl::endian::big> be_ushort_t;
  typedef unaligned_type<int, etl::endian::big> be_int_t;
  typedef unaligned_type<unsigned int, etl::endian::big> be_uint_t;
  typedef unaligned_type<long, etl::endian::big> be_long_t;
  typedef unaligned_type<unsigned long, etl::endian::big> be_ulong_t;
  typedef unaligned_type<long long, etl::endian::big> be_long_long_t;
  typedef unaligned_type<unsigned long long, etl::endian::big> be_ulong_long_t;
#if ETL_USING_8BIT_TYPES
  typedef unaligned_type<int8_t, etl::endian::big> be_int8_t;
  typedef unaligned_type<uint8_t, etl::endian::big> be_uint8_t;
#endif
  typedef unaligned_type<int16_t, etl::endian::big> be_int16_t;
  typedef unaligned_type<uint16_t, etl::endian::big> be_uint16_t;
  typedef unaligned_type<int32_t, etl::endian::big> be_int32_t;
  typedef unaligned_type<uint32_t, etl::endian::big> be_uint32_t;
#if ETL_USING_64BIT_TYPES
  typedef unaligned_type<int64_t, etl::endian::big> be_int64_t;
  typedef unaligned_type<uint64_t, etl::endian::big> be_uint64_t;
#endif
  typedef unaligned_type<float, etl::endian::big> be_float_t;
  typedef unaligned_type<double, etl::endian::big> be_double_t;
  typedef unaligned_type<long double, etl::endian::big> be_long_double_t;
 
  // Network Order
  typedef be_char_t        net_char_t;
  typedef be_schar_t       net_schar_t;
  typedef be_uchar_t       net_uchar_t;
  typedef be_short_t       net_short_t;
  typedef be_ushort_t      net_ushort_t;
  typedef be_int_t         net_int_t;
  typedef be_uint_t        net_uint_t;
  typedef be_long_t        net_long_t;
  typedef be_ulong_t       net_ulong_t;
  typedef be_long_long_t   net_long_long_t;
  typedef be_ulong_long_t  net_ulong_long_t;
#if ETL_USING_8BIT_TYPES
  typedef be_int8_t        net_int8_t;
  typedef be_uint8_t       net_uint8_t;
#endif
  typedef be_int16_t       net_int16_t;
  typedef be_uint16_t      net_uint16_t;
  typedef be_int32_t       net_int32_t;
  typedef be_uint32_t      net_uint32_t;
#if ETL_USING_64BIT_TYPES
  typedef be_int64_t       net_int64_t;
  typedef be_uint64_t      net_uint64_t;
#endif
  typedef be_float_t       net_float_t;
  typedef be_double_t      net_double_t;
  typedef be_long_double_t net_long_double_t;
 
#if ETL_USING_CPP11
  template <typename T, int Endian>
  using unaligned_type_t = typename etl::unaligned_type<T, Endian>::type;
#endif
 
#if ETL_USING_CPP17
  template <typename T, int Endian>
  constexpr size_t unaligned_type_v = etl::unaligned_type<T, Endian>::Size;
#endif
}
 
#endif