591 lines
21 KiB
C++
Executable File
591 lines
21 KiB
C++
Executable File
// boost/endian/conversion.hpp -------------------------------------------------------//
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// Copyright Beman Dawes 2010, 2011, 2014
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// Distributed under the Boost Software License, Version 1.0.
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// http://www.boost.org/LICENSE_1_0.txt
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#ifndef BOOST_ENDIAN_CONVERSION_HPP
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#define BOOST_ENDIAN_CONVERSION_HPP
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#include <boost/endian/detail/endian_reverse.hpp>
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#include <boost/endian/detail/endian_load.hpp>
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#include <boost/endian/detail/endian_store.hpp>
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#include <boost/endian/detail/order.hpp>
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#include <boost/type_traits/is_class.hpp>
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#include <boost/type_traits/is_array.hpp>
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#include <boost/type_traits/integral_constant.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/config.hpp>
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//------------------------------------- synopsis ---------------------------------------//
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namespace boost
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{
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namespace endian
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{
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//--------------------------------------------------------------------------------------//
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// //
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// return-by-value interfaces //
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// suggested by Phil Endecott //
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// //
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// user-defined types (UDTs) //
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// //
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// All return-by-value conversion function templates are required to be implemented in //
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// terms of an unqualified call to "endian_reverse(x)", a function returning the //
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// value of x with endianness reversed. This provides a customization point for any //
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// UDT that provides a "endian_reverse" free-function meeting the requirements. //
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// It must be defined in the same namespace as the UDT itself so that it will be found //
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// by argument dependent lookup (ADL). //
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// //
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//--------------------------------------------------------------------------------------//
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// reverse byte order
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// requires T to be a non-bool integral type
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// in detail/endian_reverse.hpp
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//
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// template<class T> inline BOOST_CONSTEXPR T endian_reverse( T x ) BOOST_NOEXCEPT;
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// reverse byte order unless native endianness is big
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template <class EndianReversible >
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inline BOOST_CONSTEXPR EndianReversible big_to_native(EndianReversible x) BOOST_NOEXCEPT;
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// Returns: x if native endian order is big, otherwise endian_reverse(x)
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template <class EndianReversible >
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inline BOOST_CONSTEXPR EndianReversible native_to_big(EndianReversible x) BOOST_NOEXCEPT;
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// Returns: x if native endian order is big, otherwise endian_reverse(x)
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// reverse byte order unless native endianness is little
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template <class EndianReversible >
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inline BOOST_CONSTEXPR EndianReversible little_to_native(EndianReversible x) BOOST_NOEXCEPT;
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// Returns: x if native endian order is little, otherwise endian_reverse(x)
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template <class EndianReversible >
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inline BOOST_CONSTEXPR EndianReversible native_to_little(EndianReversible x) BOOST_NOEXCEPT;
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// Returns: x if native endian order is little, otherwise endian_reverse(x)
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// generic conditional reverse byte order
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template <BOOST_SCOPED_ENUM(order) From, BOOST_SCOPED_ENUM(order) To,
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class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible conditional_reverse(EndianReversible from) BOOST_NOEXCEPT;
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// Returns: If From == To have different values, from.
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// Otherwise endian_reverse(from).
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// Remarks: The From == To test, and as a consequence which form the return takes, is
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// is determined at compile time.
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// runtime conditional reverse byte order
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template <class EndianReversible >
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inline BOOST_CONSTEXPR EndianReversible conditional_reverse(EndianReversible from,
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BOOST_SCOPED_ENUM(order) from_order, BOOST_SCOPED_ENUM(order) to_order)
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BOOST_NOEXCEPT;
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// Returns: from_order == to_order ? from : endian_reverse(from).
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//------------------------------------------------------------------------------------//
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// Q: What happened to bswap, htobe, and the other synonym functions based on names
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// popularized by BSD, OS X, and Linux?
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// A: Turned out these may be implemented as macros on some systems. Ditto POSIX names
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// for such functionality. Since macros would cause endless problems with functions
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// of the same names, and these functions are just synonyms anyhow, they have been
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// removed.
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//------------------------------------------------------------------------------------//
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// //
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// reverse in place interfaces //
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// //
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// user-defined types (UDTs) //
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// //
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// All reverse in place function templates are required to be implemented in terms //
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// of an unqualified call to "endian_reverse_inplace(x)", a function reversing //
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// the endianness of x, which is a non-const reference. This provides a //
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// customization point for any UDT that provides a "reverse_inplace" free-function //
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// meeting the requirements. The free-function must be declared in the same //
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// namespace as the UDT itself so that it will be found by argument-dependent //
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// lookup (ADL). //
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// //
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//------------------------------------------------------------------------------------//
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// reverse in place
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// in detail/endian_reverse.hpp
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//
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// template <class EndianReversible>
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// inline void endian_reverse_inplace(EndianReversible& x) BOOST_NOEXCEPT;
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//
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// Effects: x = endian_reverse(x)
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// reverse in place unless native endianness is big
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template <class EndianReversibleInplace>
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inline void big_to_native_inplace(EndianReversibleInplace& x) BOOST_NOEXCEPT;
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// Effects: none if native byte-order is big, otherwise endian_reverse_inplace(x)
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template <class EndianReversibleInplace>
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inline void native_to_big_inplace(EndianReversibleInplace& x) BOOST_NOEXCEPT;
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// Effects: none if native byte-order is big, otherwise endian_reverse_inplace(x)
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// reverse in place unless native endianness is little
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template <class EndianReversibleInplace>
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inline void little_to_native_inplace(EndianReversibleInplace& x) BOOST_NOEXCEPT;
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// Effects: none if native byte-order is little, otherwise endian_reverse_inplace(x);
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template <class EndianReversibleInplace>
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inline void native_to_little_inplace(EndianReversibleInplace& x) BOOST_NOEXCEPT;
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// Effects: none if native byte-order is little, otherwise endian_reverse_inplace(x);
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// generic conditional reverse in place
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template <BOOST_SCOPED_ENUM(order) From, BOOST_SCOPED_ENUM(order) To,
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class EndianReversibleInplace>
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inline void conditional_reverse_inplace(EndianReversibleInplace& x) BOOST_NOEXCEPT;
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// runtime reverse in place
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template <class EndianReversibleInplace>
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inline void conditional_reverse_inplace(EndianReversibleInplace& x,
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BOOST_SCOPED_ENUM(order) from_order, BOOST_SCOPED_ENUM(order) to_order)
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BOOST_NOEXCEPT;
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//----------------------------------- end synopsis -------------------------------------//
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template <class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible big_to_native( EndianReversible x ) BOOST_NOEXCEPT
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{
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return boost::endian::conditional_reverse<order::big, order::native>( x );
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}
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template <class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible native_to_big( EndianReversible x ) BOOST_NOEXCEPT
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{
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return boost::endian::conditional_reverse<order::native, order::big>( x );
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}
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template <class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible little_to_native( EndianReversible x ) BOOST_NOEXCEPT
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{
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return boost::endian::conditional_reverse<order::little, order::native>( x );
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}
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template <class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible native_to_little( EndianReversible x ) BOOST_NOEXCEPT
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{
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return boost::endian::conditional_reverse<order::native, order::little>( x );
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}
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namespace detail
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{
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template<class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible conditional_reverse_impl( EndianReversible x, boost::true_type ) BOOST_NOEXCEPT
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{
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return x;
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}
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template<class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible conditional_reverse_impl( EndianReversible x, boost::false_type ) BOOST_NOEXCEPT
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{
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return endian_reverse( x );
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}
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} // namespace detail
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// generic conditional reverse
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template <BOOST_SCOPED_ENUM(order) From, BOOST_SCOPED_ENUM(order) To, class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible conditional_reverse( EndianReversible x ) BOOST_NOEXCEPT
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{
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BOOST_STATIC_ASSERT( boost::is_class<EndianReversible>::value || detail::is_endian_reversible<EndianReversible>::value );
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return detail::conditional_reverse_impl( x, boost::integral_constant<bool, From == To>() );
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}
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// runtime conditional reverse
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template <class EndianReversible>
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inline BOOST_CONSTEXPR EndianReversible conditional_reverse( EndianReversible x,
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BOOST_SCOPED_ENUM(order) from_order, BOOST_SCOPED_ENUM(order) to_order ) BOOST_NOEXCEPT
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{
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BOOST_STATIC_ASSERT( boost::is_class<EndianReversible>::value || detail::is_endian_reversible<EndianReversible>::value );
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return from_order == to_order? x: endian_reverse( x );
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}
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//--------------------------------------------------------------------------------------//
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// reverse-in-place implementation //
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//--------------------------------------------------------------------------------------//
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template <class EndianReversibleInplace>
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inline void big_to_native_inplace( EndianReversibleInplace& x ) BOOST_NOEXCEPT
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{
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boost::endian::conditional_reverse_inplace<order::big, order::native>( x );
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}
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template <class EndianReversibleInplace>
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inline void native_to_big_inplace( EndianReversibleInplace& x ) BOOST_NOEXCEPT
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{
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boost::endian::conditional_reverse_inplace<order::native, order::big>( x );
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}
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template <class EndianReversibleInplace>
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inline void little_to_native_inplace( EndianReversibleInplace& x ) BOOST_NOEXCEPT
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{
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boost::endian::conditional_reverse_inplace<order::little, order::native>( x );
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}
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template <class EndianReversibleInplace>
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inline void native_to_little_inplace( EndianReversibleInplace& x ) BOOST_NOEXCEPT
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{
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boost::endian::conditional_reverse_inplace<order::native, order::little>( x );
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}
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namespace detail
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{
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template<class EndianReversibleInplace>
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inline void conditional_reverse_inplace_impl( EndianReversibleInplace&, boost::true_type ) BOOST_NOEXCEPT
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{
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}
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template<class EndianReversibleInplace>
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inline void conditional_reverse_inplace_impl( EndianReversibleInplace& x, boost::false_type ) BOOST_NOEXCEPT
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{
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endian_reverse_inplace( x );
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}
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} // namespace detail
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// generic conditional reverse in place
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template <BOOST_SCOPED_ENUM(order) From, BOOST_SCOPED_ENUM(order) To, class EndianReversibleInplace>
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inline void conditional_reverse_inplace( EndianReversibleInplace& x ) BOOST_NOEXCEPT
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{
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BOOST_STATIC_ASSERT(
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boost::is_class<EndianReversibleInplace>::value ||
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boost::is_array<EndianReversibleInplace>::value ||
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detail::is_endian_reversible_inplace<EndianReversibleInplace>::value );
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detail::conditional_reverse_inplace_impl( x, boost::integral_constant<bool, From == To>() );
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}
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// runtime reverse in place
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template <class EndianReversibleInplace>
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inline void conditional_reverse_inplace( EndianReversibleInplace& x,
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BOOST_SCOPED_ENUM(order) from_order, BOOST_SCOPED_ENUM(order) to_order ) BOOST_NOEXCEPT
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{
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BOOST_STATIC_ASSERT(
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boost::is_class<EndianReversibleInplace>::value ||
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boost::is_array<EndianReversibleInplace>::value ||
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detail::is_endian_reversible_inplace<EndianReversibleInplace>::value );
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if( from_order != to_order )
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{
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endian_reverse_inplace( x );
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}
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}
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// load/store convenience functions
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// load 16
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inline boost::int16_t load_little_s16( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int16_t, 2, order::little>( p );
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}
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inline boost::uint16_t load_little_u16( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint16_t, 2, order::little>( p );
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}
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inline boost::int16_t load_big_s16( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int16_t, 2, order::big>( p );
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}
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inline boost::uint16_t load_big_u16( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint16_t, 2, order::big>( p );
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}
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// load 24
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inline boost::int32_t load_little_s24( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int32_t, 3, order::little>( p );
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}
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inline boost::uint32_t load_little_u24( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint32_t, 3, order::little>( p );
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}
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inline boost::int32_t load_big_s24( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int32_t, 3, order::big>( p );
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}
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inline boost::uint32_t load_big_u24( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint32_t, 3, order::big>( p );
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}
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// load 32
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inline boost::int32_t load_little_s32( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int32_t, 4, order::little>( p );
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}
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inline boost::uint32_t load_little_u32( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint32_t, 4, order::little>( p );
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}
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inline boost::int32_t load_big_s32( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int32_t, 4, order::big>( p );
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}
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inline boost::uint32_t load_big_u32( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint32_t, 4, order::big>( p );
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}
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// load 40
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inline boost::int64_t load_little_s40( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 5, order::little>( p );
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}
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inline boost::uint64_t load_little_u40( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 5, order::little>( p );
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}
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inline boost::int64_t load_big_s40( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 5, order::big>( p );
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}
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inline boost::uint64_t load_big_u40( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 5, order::big>( p );
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}
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// load 48
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inline boost::int64_t load_little_s48( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 6, order::little>( p );
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}
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inline boost::uint64_t load_little_u48( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 6, order::little>( p );
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}
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inline boost::int64_t load_big_s48( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 6, order::big>( p );
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}
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inline boost::uint64_t load_big_u48( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 6, order::big>( p );
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}
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// load 56
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inline boost::int64_t load_little_s56( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 7, order::little>( p );
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}
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inline boost::uint64_t load_little_u56( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 7, order::little>( p );
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}
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inline boost::int64_t load_big_s56( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 7, order::big>( p );
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}
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inline boost::uint64_t load_big_u56( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 7, order::big>( p );
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}
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// load 64
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inline boost::int64_t load_little_s64( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 8, order::little>( p );
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}
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inline boost::uint64_t load_little_u64( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 8, order::little>( p );
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}
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inline boost::int64_t load_big_s64( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::int64_t, 8, order::big>( p );
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}
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inline boost::uint64_t load_big_u64( unsigned char const * p ) BOOST_NOEXCEPT
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{
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return boost::endian::endian_load<boost::uint64_t, 8, order::big>( p );
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}
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// store 16
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inline void store_little_s16( unsigned char * p, boost::int16_t v )
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{
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boost::endian::endian_store<boost::int16_t, 2, order::little>( p, v );
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}
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inline void store_little_u16( unsigned char * p, boost::uint16_t v )
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{
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boost::endian::endian_store<boost::uint16_t, 2, order::little>( p, v );
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}
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inline void store_big_s16( unsigned char * p, boost::int16_t v )
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{
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boost::endian::endian_store<boost::int16_t, 2, order::big>( p, v );
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}
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inline void store_big_u16( unsigned char * p, boost::uint16_t v )
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{
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boost::endian::endian_store<boost::uint16_t, 2, order::big>( p, v );
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}
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// store 24
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inline void store_little_s24( unsigned char * p, boost::int32_t v )
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{
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boost::endian::endian_store<boost::int32_t, 3, order::little>( p, v );
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}
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inline void store_little_u24( unsigned char * p, boost::uint32_t v )
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{
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boost::endian::endian_store<boost::uint32_t, 3, order::little>( p, v );
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}
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inline void store_big_s24( unsigned char * p, boost::int32_t v )
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{
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boost::endian::endian_store<boost::int32_t, 3, order::big>( p, v );
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}
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inline void store_big_u24( unsigned char * p, boost::uint32_t v )
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{
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boost::endian::endian_store<boost::uint32_t, 3, order::big>( p, v );
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}
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// store 32
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inline void store_little_s32( unsigned char * p, boost::int32_t v )
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{
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boost::endian::endian_store<boost::int32_t, 4, order::little>( p, v );
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}
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inline void store_little_u32( unsigned char * p, boost::uint32_t v )
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{
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boost::endian::endian_store<boost::uint32_t, 4, order::little>( p, v );
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}
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inline void store_big_s32( unsigned char * p, boost::int32_t v )
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{
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boost::endian::endian_store<boost::int32_t, 4, order::big>( p, v );
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}
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inline void store_big_u32( unsigned char * p, boost::uint32_t v )
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{
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boost::endian::endian_store<boost::uint32_t, 4, order::big>( p, v );
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}
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// store 40
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inline void store_little_s40( unsigned char * p, boost::int64_t v )
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{
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boost::endian::endian_store<boost::int64_t, 5, order::little>( p, v );
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}
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inline void store_little_u40( unsigned char * p, boost::uint64_t v )
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{
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boost::endian::endian_store<boost::uint64_t, 5, order::little>( p, v );
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}
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inline void store_big_s40( unsigned char * p, boost::int64_t v )
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{
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boost::endian::endian_store<boost::int64_t, 5, order::big>( p, v );
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}
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inline void store_big_u40( unsigned char * p, boost::uint64_t v )
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{
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boost::endian::endian_store<boost::uint64_t, 5, order::big>( p, v );
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}
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// store 48
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|
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inline void store_little_s48( unsigned char * p, boost::int64_t v )
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{
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boost::endian::endian_store<boost::int64_t, 6, order::little>( p, v );
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}
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|
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inline void store_little_u48( unsigned char * p, boost::uint64_t v )
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|
{
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boost::endian::endian_store<boost::uint64_t, 6, order::little>( p, v );
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|
}
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|
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inline void store_big_s48( unsigned char * p, boost::int64_t v )
|
|
{
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boost::endian::endian_store<boost::int64_t, 6, order::big>( p, v );
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|
}
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|
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inline void store_big_u48( unsigned char * p, boost::uint64_t v )
|
|
{
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boost::endian::endian_store<boost::uint64_t, 6, order::big>( p, v );
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|
}
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|
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|
// store 56
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|
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inline void store_little_s56( unsigned char * p, boost::int64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::int64_t, 7, order::little>( p, v );
|
|
}
|
|
|
|
inline void store_little_u56( unsigned char * p, boost::uint64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::uint64_t, 7, order::little>( p, v );
|
|
}
|
|
|
|
inline void store_big_s56( unsigned char * p, boost::int64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::int64_t, 7, order::big>( p, v );
|
|
}
|
|
|
|
inline void store_big_u56( unsigned char * p, boost::uint64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::uint64_t, 7, order::big>( p, v );
|
|
}
|
|
|
|
// store 64
|
|
|
|
inline void store_little_s64( unsigned char * p, boost::int64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::int64_t, 8, order::little>( p, v );
|
|
}
|
|
|
|
inline void store_little_u64( unsigned char * p, boost::uint64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::uint64_t, 8, order::little>( p, v );
|
|
}
|
|
|
|
inline void store_big_s64( unsigned char * p, boost::int64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::int64_t, 8, order::big>( p, v );
|
|
}
|
|
|
|
inline void store_big_u64( unsigned char * p, boost::uint64_t v )
|
|
{
|
|
boost::endian::endian_store<boost::uint64_t, 8, order::big>( p, v );
|
|
}
|
|
|
|
} // namespace endian
|
|
} // namespace boost
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|
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|
#endif // BOOST_ENDIAN_CONVERSION_HPP
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