forked from boostorg/endian
Initial commit, corresponding to endian-0.8
git-svn-id: http://svn.boost.org/svn/boost/sandbox/endian@45953 b8fc166d-592f-0410-95f2-cb63ce0dd405
This commit is contained in:
bemandawes
@@ -0,0 +1,77 @@
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// boost/integer/cover_operators.hpp ----------------------------------------//
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// (C) Copyright Darin Adler 2000
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//----------------------------------------------------------------------------//
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#ifndef BOOST_INTEGER_COVER_OPERATORS_HPP
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#define BOOST_INTEGER_COVER_OPERATORS_HPP
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#include <boost/operators.hpp>
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#include <iosfwd>
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namespace boost
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{
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namespace integer
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{
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// A class that adds integer operators to an integer cover class
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template <typename T, typename IntegerType>
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class cover_operators : boost::operators<T>
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{
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// The other operations take advantage of the type conversion that's
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// built into unary +.
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// Unary operations.
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friend IntegerType operator+(const T& x) { return x; }
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friend IntegerType operator-(const T& x) { return -+x; }
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friend IntegerType operator~(const T& x) { return ~+x; }
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friend IntegerType operator!(const T& x) { return !+x; }
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// The basic ordering operations.
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friend bool operator==(const T& x, IntegerType y) { return +x == y; }
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friend bool operator<(const T& x, IntegerType y) { return +x < y; }
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// The basic arithmetic operations.
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friend T& operator+=(T& x, IntegerType y) { return x = +x + y; }
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friend T& operator-=(T& x, IntegerType y) { return x = +x - y; }
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friend T& operator*=(T& x, IntegerType y) { return x = +x * y; }
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friend T& operator/=(T& x, IntegerType y) { return x = +x / y; }
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friend T& operator%=(T& x, IntegerType y) { return x = +x % y; }
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friend T& operator&=(T& x, IntegerType y) { return x = +x & y; }
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friend T& operator|=(T& x, IntegerType y) { return x = +x | y; }
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friend T& operator^=(T& x, IntegerType y) { return x = +x ^ y; }
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friend T& operator<<=(T& x, IntegerType y) { return x = +x << y; }
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friend T& operator>>=(T& x, IntegerType y) { return x = +x >> y; }
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// A few binary arithmetic operations not covered by operators base class.
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friend IntegerType operator<<(const T& x, IntegerType y) { return +x << y; }
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friend IntegerType operator>>(const T& x, IntegerType y) { return +x >> y; }
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// Auto-increment and auto-decrement can be defined in terms of the
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// arithmetic operations.
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friend T& operator++(T& x) { return x += 1; }
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friend T& operator--(T& x) { return x -= 1; }
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/// TODO: stream I/O needs to be templatized on the stream type, so will
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/// work with wide streams, etc.
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// Stream input and output.
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friend std::ostream& operator<<(std::ostream& s, const T& x)
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{ return s << +x; }
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friend std::istream& operator>>(std::istream& s, T& x)
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{
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IntegerType i;
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if (s >> i)
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x = i;
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return s;
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}
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};
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} // namespace integer
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} // namespace boost
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#endif // BOOST_INTEGER_COVER_OPERATORS_HPP
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@@ -0,0 +1,346 @@
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// Boost endian.hpp header file (proposed) ----------------------------------//
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// (C) Copyright Darin Adler 2000
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// (C) Copyright Beman Dawes 2006
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See library home page at http://www.boost.org/libs/endian
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//----------------------------------------------------------------------------//
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// Original design developed by Darin Adler based on classes developed by Mark
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// Borgerding. Four original class templates combined into a single endian
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// class template by Beman Dawes, who also added the unrolled_byte_loops sign
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// partial specialization to correctly extend the sign when cover integer size
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// differs from endian representation size.
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// TODO:
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// * Use C++0x scoped enums if available
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// * Use C++0x defaulted default constructor if available
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// * Propose, use, BOOST_CONSTEXPR.
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// * Propose BOOST_EXPLICIT, apply if needed
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// * Should there be a conversion to bool?
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#ifndef BOOST_ENDIAN_HPP
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#define BOOST_ENDIAN_HPP
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#include <boost/detail/endian.hpp>
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#include <boost/integer/cover_operators.hpp>
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#include <boost/type_traits/is_signed.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/static_assert.hpp>
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#include <iosfwd>
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#include <climits>
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# if CHAR_BIT != 8
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# error Platforms with CHAR_BIT != 8 are not supported
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# endif
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namespace boost
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{
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namespace detail
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{
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// Unrolled loops for loading and storing streams of bytes.
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template <typename T, std::size_t n_bytes,
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bool sign=boost::is_signed<T>::value >
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struct unrolled_byte_loops
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{
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typedef unrolled_byte_loops<T, n_bytes - 1, sign> next;
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static T load_big(const unsigned char* bytes)
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{ return *(bytes - 1) | (next::load_big(bytes - 1) << 8); }
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static T load_little(const unsigned char* bytes)
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{ return *bytes | (next::load_little(bytes + 1) << 8); }
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static void store_big(char* bytes, T value)
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{
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*(bytes - 1) = static_cast<char>(value);
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next::store_big(bytes - 1, value >> 8);
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}
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static void store_little(char* bytes, T value)
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{
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*bytes = static_cast<char>(value);
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next::store_little(bytes + 1, value >> 8);
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}
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};
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template <typename T>
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struct unrolled_byte_loops<T, 1, false>
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{
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static T load_big(const unsigned char* bytes)
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{ return *(bytes - 1); }
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static T load_little(const unsigned char* bytes)
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{ return *bytes; }
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static void store_big(char* bytes, T value)
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{ *(bytes - 1) = static_cast<char>(value); }
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static void store_little(char* bytes, T value)
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{ *bytes = static_cast<char>(value); }
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};
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template <typename T>
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struct unrolled_byte_loops<T, 1, true>
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{
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static T load_big(const unsigned char* bytes)
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{ return *reinterpret_cast<const signed char*>(bytes - 1); }
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static T load_little(const unsigned char* bytes)
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{ return *reinterpret_cast<const signed char*>(bytes); }
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static void store_big(char* bytes, T value)
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{ *(bytes - 1) = static_cast<char>(value); }
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static void store_little(char* bytes, T value)
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{ *bytes = static_cast<char>(value); }
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};
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template <typename T, std::size_t n_bytes>
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inline
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T load_big_endian(const void* bytes)
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{
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return unrolled_byte_loops<T, n_bytes>::load_big
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(static_cast<const unsigned char*>(bytes) + n_bytes);
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}
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template <typename T, std::size_t n_bytes>
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inline
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T load_little_endian(const void* bytes)
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{
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return unrolled_byte_loops<T, n_bytes>::load_little
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(static_cast<const unsigned char*>(bytes));
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}
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template <typename T, std::size_t n_bytes>
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inline
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void store_big_endian(void* bytes, T value)
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{
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unrolled_byte_loops<T, n_bytes>::store_big
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(static_cast<char*>(bytes) + n_bytes, value);
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}
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template <typename T, std::size_t n_bytes>
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inline
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void store_little_endian(void* bytes, T value)
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{
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unrolled_byte_loops<T, n_bytes>::store_little
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(static_cast<char*>(bytes), value);
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}
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} // namespace detail
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namespace integer
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{
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// endian class template and specializations -----------------------------//
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// simulate C++0x scoped enums
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namespace endianness { enum enum_t { big, little, native }; }
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namespace alignment { enum enum_t { unaligned, aligned }; }
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template <endianness::enum_t E, typename T, std::size_t n_bits,
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alignment::enum_t A = alignment::unaligned>
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class endian;
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// Specializations that represent unaligned bytes.
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// Taking an integer type as a parameter provides a nice way to pass both
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// the size and signedness of the desired integer and get the appropriate
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// corresponding integer type for the interface.
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template <typename T, std::size_t n_bits>
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class endian< endianness::big, T, n_bits, alignment::unaligned >
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: cover_operators< endian< endianness::big, T, n_bits >, T >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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public:
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typedef T value_type;
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endian() {}
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endian(T val) { detail::store_big_endian<T, n_bits/8>(bytes, val); }
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endian & operator=(T val) { detail::store_big_endian<T, n_bits/8>(bytes, val); return *this; }
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operator T() const { return detail::load_big_endian<T, n_bits/8>(bytes); }
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private:
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char bytes[n_bits/8];
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};
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template <typename T, std::size_t n_bits>
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class endian< endianness::little, T, n_bits, alignment::unaligned >
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: cover_operators< endian< endianness::little, T, n_bits >, T >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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public:
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typedef T value_type;
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endian() {}
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endian(T val) { detail::store_little_endian<T, n_bits/8>(bytes, val); }
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endian & operator=(T val) { detail::store_little_endian<T, n_bits/8>(bytes, val); return *this; }
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operator T() const { return detail::load_little_endian<T, n_bits/8>(bytes); }
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private:
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char bytes[n_bits/8];
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};
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template <typename T, std::size_t n_bits>
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class endian< endianness::native, T, n_bits, alignment::unaligned >
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: cover_operators< endian< endianness::native, T, n_bits >, T >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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public:
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typedef T value_type;
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endian() {}
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# ifdef BOOST_BIG_ENDIAN
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endian(T val) { detail::store_big_endian<T, n_bits/8>(bytes, val); }
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endian & operator=(T val) { detail::store_big_endian<T, n_bits/8>(bytes, val); return *this; }
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operator T() const { return detail::load_big_endian<T, n_bits/8>(bytes); }
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# else
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endian(T val) { detail::store_little_endian<T, n_bits/8>(bytes, val); }
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endian & operator=(T val) { detail::store_little_endian<T, n_bits/8>(bytes, val); return *this; }
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operator T() const { return detail::load_little_endian<T, n_bits/8>(bytes); }
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# endif
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private:
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char bytes[n_bits/8];
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};
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// Specializations that mimic built-in integer types.
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// These typically have the same alignment as the underlying types.
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template <typename T, std::size_t n_bits>
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class endian< endianness::big, T, n_bits, alignment::aligned >
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: cover_operators< endian< endianness::big, T, n_bits, alignment::aligned >, T >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 );
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public:
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typedef T value_type;
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endian() {}
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#ifdef BOOST_BIG_ENDIAN
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endian(T val) : integer(val) { }
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endian & operator=(T val) { integer = val); return *this; }
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operator T() const { return integer; }
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#else
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endian(T val) { detail::store_big_endian<T, sizeof(T)>(&integer, val); }
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endian & operator=(T val) { detail::store_big_endian<T, sizeof(T)>(&integer, val); return *this; }
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operator T() const { return detail::load_big_endian<T, sizeof(T)>(&integer); }
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#endif
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private:
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T integer;
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};
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template <typename T, std::size_t n_bits>
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class endian< endianness::little, T, n_bits, alignment::aligned >
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: cover_operators< endian< endianness::little, T, n_bits, alignment::aligned >, T >
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{
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BOOST_STATIC_ASSERT( (n_bits/8)*8 == n_bits );
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BOOST_STATIC_ASSERT( sizeof(T) == n_bits/8 );
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public:
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typedef T value_type;
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endian() {}
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#ifdef BOOST_LITTLE_ENDIAN
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endian(T val) : integer(val) { }
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endian & operator=(T val) { integer = val; return *this; }
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operator T() const { return integer; }
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#else
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endian(T val) { detail::store_little_endian<T, sizeof(T)>(&integer, val); }
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endian & operator=(T val) { detail::store_little_endian<T, sizeof(T)>(&integer, val); return *this; }
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operator T() const { return detail::load_little_endian<T, sizeof(T)>(&integer); }
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#endif
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private:
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T integer;
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};
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// naming convention typedefs --------------------------------------------//
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// unaligned big endian signed integer types
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typedef endian< endianness::big, int_least8_t, 8 > big8_t;
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typedef endian< endianness::big, int_least16_t, 16 > big16_t;
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typedef endian< endianness::big, int_least32_t, 24 > big24_t;
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typedef endian< endianness::big, int_least32_t, 32 > big32_t;
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typedef endian< endianness::big, int_least64_t, 40 > big40_t;
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typedef endian< endianness::big, int_least64_t, 48 > big48_t;
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typedef endian< endianness::big, int_least64_t, 56 > big56_t;
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typedef endian< endianness::big, int_least64_t, 64 > big64_t;
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// unaligned big endian unsigned integer types
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typedef endian< endianness::big, uint_least8_t, 8 > ubig8_t;
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typedef endian< endianness::big, uint_least16_t, 16 > ubig16_t;
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typedef endian< endianness::big, uint_least32_t, 24 > ubig24_t;
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typedef endian< endianness::big, uint_least32_t, 32 > ubig32_t;
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typedef endian< endianness::big, uint_least64_t, 40 > ubig40_t;
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typedef endian< endianness::big, uint_least64_t, 48 > ubig48_t;
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typedef endian< endianness::big, uint_least64_t, 56 > ubig56_t;
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typedef endian< endianness::big, uint_least64_t, 64 > ubig64_t;
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// unaligned little endian signed integer types
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typedef endian< endianness::little, int_least8_t, 8 > little8_t;
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typedef endian< endianness::little, int_least16_t, 16 > little16_t;
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typedef endian< endianness::little, int_least32_t, 24 > little24_t;
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||||
typedef endian< endianness::little, int_least32_t, 32 > little32_t;
|
||||
typedef endian< endianness::little, int_least64_t, 40 > little40_t;
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||||
typedef endian< endianness::little, int_least64_t, 48 > little48_t;
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||||
typedef endian< endianness::little, int_least64_t, 56 > little56_t;
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||||
typedef endian< endianness::little, int_least64_t, 64 > little64_t;
|
||||
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||||
// unaligned little endian unsigned integer types
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||||
typedef endian< endianness::little, uint_least8_t, 8 > ulittle8_t;
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||||
typedef endian< endianness::little, uint_least16_t, 16 > ulittle16_t;
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||||
typedef endian< endianness::little, uint_least32_t, 24 > ulittle24_t;
|
||||
typedef endian< endianness::little, uint_least32_t, 32 > ulittle32_t;
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||||
typedef endian< endianness::little, uint_least64_t, 40 > ulittle40_t;
|
||||
typedef endian< endianness::little, uint_least64_t, 48 > ulittle48_t;
|
||||
typedef endian< endianness::little, uint_least64_t, 56 > ulittle56_t;
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||||
typedef endian< endianness::little, uint_least64_t, 64 > ulittle64_t;
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||||
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||||
// unaligned native endian signed integer types
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||||
typedef endian< endianness::native, int_least8_t, 8 > native8_t;
|
||||
typedef endian< endianness::native, int_least16_t, 16 > native16_t;
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||||
typedef endian< endianness::native, int_least32_t, 24 > native24_t;
|
||||
typedef endian< endianness::native, int_least32_t, 32 > native32_t;
|
||||
typedef endian< endianness::native, int_least64_t, 40 > native40_t;
|
||||
typedef endian< endianness::native, int_least64_t, 48 > native48_t;
|
||||
typedef endian< endianness::native, int_least64_t, 56 > native56_t;
|
||||
typedef endian< endianness::native, int_least64_t, 64 > native64_t;
|
||||
|
||||
// unaligned native endian unsigned integer types
|
||||
typedef endian< endianness::native, uint_least8_t, 8 > unative8_t;
|
||||
typedef endian< endianness::native, uint_least16_t, 16 > unative16_t;
|
||||
typedef endian< endianness::native, uint_least32_t, 24 > unative24_t;
|
||||
typedef endian< endianness::native, uint_least32_t, 32 > unative32_t;
|
||||
typedef endian< endianness::native, uint_least64_t, 40 > unative40_t;
|
||||
typedef endian< endianness::native, uint_least64_t, 48 > unative48_t;
|
||||
typedef endian< endianness::native, uint_least64_t, 56 > unative56_t;
|
||||
typedef endian< endianness::native, uint_least64_t, 64 > unative64_t;
|
||||
|
||||
#define BOOST_HAS_INT16_T
|
||||
#define BOOST_HAS_INT32_T
|
||||
#define BOOST_HAS_INT64_T
|
||||
|
||||
// These types only present if platform has exact size integers:
|
||||
// aligned big endian signed integer types
|
||||
// aligned big endian unsigned integer types
|
||||
// aligned little endian signed integer types
|
||||
// aligned little endian unsigned integer types
|
||||
|
||||
// aligned native endian typedefs are not provided because
|
||||
// <cstdint> types are superior for this use case
|
||||
|
||||
# if defined(BOOST_HAS_INT16_T)
|
||||
typedef endian< endianness::big, int16_t, 16, alignment::aligned > aligned_big16_t;
|
||||
typedef endian< endianness::big, uint16_t, 16, alignment::aligned > aligned_ubig16_t;
|
||||
typedef endian< endianness::little, int16_t, 16, alignment::aligned > aligned_little16_t;
|
||||
typedef endian< endianness::little, uint16_t, 16, alignment::aligned > aligned_ulittle16_t;
|
||||
# endif
|
||||
|
||||
# if defined(BOOST_HAS_INT32_T)
|
||||
typedef endian< endianness::big, int32_t, 32, alignment::aligned > aligned_big32_t;
|
||||
typedef endian< endianness::big, uint32_t, 32, alignment::aligned > aligned_ubig32_t;
|
||||
typedef endian< endianness::little, int32_t, 32, alignment::aligned > aligned_little32_t;
|
||||
typedef endian< endianness::little, uint32_t, 32, alignment::aligned > aligned_ulittle32_t;
|
||||
# endif
|
||||
|
||||
# if defined(BOOST_HAS_INT64_T)
|
||||
typedef endian< endianness::big, int64_t, 64, alignment::aligned > aligned_big64_t;
|
||||
typedef endian< endianness::big, uint64_t, 64, alignment::aligned > aligned_ubig64_t;
|
||||
typedef endian< endianness::little, int64_t, 64, alignment::aligned > aligned_little64_t;
|
||||
typedef endian< endianness::little, uint64_t, 64, alignment::aligned > aligned_ulittle64_t;
|
||||
# endif
|
||||
|
||||
} // namespace integer
|
||||
} // namespace boost
|
||||
|
||||
#endif // BOOST_ENDIAN_HPP
|
||||
Reference in New Issue
Block a user