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//
// ByteOrder.h
//
// Library: Foundation
// Package: Core
// Module: ByteOrder
//
// Copyright (c) 2004-2014, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_ByteOrder_INCLUDED
#define Foundation_ByteOrder_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/Types.h"
#if defined(_MSC_VER)
#include <stdlib.h> // builtins
#endif
namespace Poco {
class Foundation_API ByteOrder
/// This class contains a number of static methods
/// to convert between big-endian and little-endian
/// integers of various sizes.
{
public:
static Int8 flipBytes(Int8 value);
static UInt8 flipBytes(UInt8 value);
static Int16 flipBytes(Int16 value);
static UInt16 flipBytes(UInt16 value);
static Int32 flipBytes(Int32 value);
static UInt32 flipBytes(UInt32 value);
static float flipBytes(float value);
static double flipBytes(double value);
#if defined(POCO_HAVE_INT64)
static Int64 flipBytes(Int64 value);
static UInt64 flipBytes(UInt64 value);
#endif
static Int8 toBigEndian(Int8 value);
static UInt8 toBigEndian(UInt8 value);
static Int16 toBigEndian(Int16 value);
static UInt16 toBigEndian (UInt16 value);
static Int32 toBigEndian(Int32 value);
static UInt32 toBigEndian (UInt32 value);
#if defined(POCO_HAVE_INT64)
static Int64 toBigEndian(Int64 value);
static UInt64 toBigEndian (UInt64 value);
#endif
static Int8 fromBigEndian(Int8 value);
static UInt8 fromBigEndian(UInt8 value);
static Int16 fromBigEndian(Int16 value);
static UInt16 fromBigEndian (UInt16 value);
static Int32 fromBigEndian(Int32 value);
static UInt32 fromBigEndian (UInt32 value);
#if defined(POCO_HAVE_INT64)
static Int64 fromBigEndian(Int64 value);
static UInt64 fromBigEndian (UInt64 value);
#endif
static Int8 toLittleEndian(Int8 value);
static UInt8 toLittleEndian(UInt8 value);
static Int16 toLittleEndian(Int16 value);
static UInt16 toLittleEndian (UInt16 value);
static Int32 toLittleEndian(Int32 value);
static UInt32 toLittleEndian (UInt32 value);
#if defined(POCO_HAVE_INT64)
static Int64 toLittleEndian(Int64 value);
static UInt64 toLittleEndian (UInt64 value);
#endif
static Int8 fromLittleEndian(Int8 value);
static UInt8 fromLittleEndian(UInt8 value);
static Int16 fromLittleEndian(Int16 value);
static UInt16 fromLittleEndian (UInt16 value);
static Int32 fromLittleEndian(Int32 value);
static UInt32 fromLittleEndian (UInt32 value);
#if defined(POCO_HAVE_INT64)
static Int64 fromLittleEndian(Int64 value);
static UInt64 fromLittleEndian (UInt64 value);
#endif
static Int8 toNetwork(Int8 value);
static UInt8 toNetwork(UInt8 value);
static Int16 toNetwork(Int16 value);
static UInt16 toNetwork (UInt16 value);
static Int32 toNetwork(Int32 value);
static UInt32 toNetwork (UInt32 value);
#if defined(POCO_HAVE_INT64)
static Int64 toNetwork(Int64 value);
static UInt64 toNetwork (UInt64 value);
#endif
static Int8 fromNetwork(Int8 value);
static UInt8 fromNetwork(UInt8 value);
static Int16 fromNetwork(Int16 value);
static UInt16 fromNetwork (UInt16 value);
static Int32 fromNetwork(Int32 value);
static UInt32 fromNetwork (UInt32 value);
#if defined(POCO_HAVE_INT64)
static Int64 fromNetwork(Int64 value);
static UInt64 fromNetwork (UInt64 value);
#endif
private:
template<typename T>
static T flip(T value)
{
T flip = value;
std::size_t halfSize = sizeof(T) / 2;
char* flipP = reinterpret_cast<char*>(&flip);
for (std::size_t i = 0; i < halfSize; i++)
{
std::swap(flipP[i], flipP[sizeof(T) - i - 1]);
}
return flip;
}
};
#if !defined(POCO_NO_BYTESWAP_BUILTINS)
#if defined(_MSC_VER)
#if (POCO_MSVC_VERSION > 71)
#define POCO_HAVE_MSC_BYTESWAP 1
#endif
#elif defined(__clang__)
#if __has_builtin(__builtin_bswap32)
#define POCO_HAVE_GCC_BYTESWAP 1
#endif
#elif defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
#define POCO_HAVE_GCC_BYTESWAP 1
#endif
#endif
//
// inlines
//
inline UInt8 ByteOrder::flipBytes(UInt8 value)
{
return value;
}
inline Int8 ByteOrder::flipBytes(Int8 value)
{
return value;
}
inline UInt16 ByteOrder::flipBytes(UInt16 value)
{
#if defined(POCO_HAVE_MSC_BYTESWAP)
return _byteswap_ushort(value);
#else
return ((value >> 8) & 0x00FF) | ((value << 8) & 0xFF00);
#endif
}
inline Int16 ByteOrder::flipBytes(Int16 value)
{
return Int16(flipBytes(UInt16(value)));
}
inline UInt32 ByteOrder::flipBytes(UInt32 value)
{
#if defined(POCO_HAVE_MSC_BYTESWAP)
return _byteswap_ulong(value);
#elif defined(POCO_HAVE_GCC_BYTESWAP)
return __builtin_bswap32(value);
#else
return ((value >> 24) & 0x000000FF) | ((value >> 8) & 0x0000FF00)
| ((value << 8) & 0x00FF0000) | ((value << 24) & 0xFF000000);
#endif
}
inline Int32 ByteOrder::flipBytes(Int32 value)
{
return Int32(flipBytes(UInt32(value)));
}
inline float ByteOrder::flipBytes(float value)
{
return flip(value);
}
inline double ByteOrder::flipBytes(double value)
{
return flip(value);
}
#if defined(POCO_HAVE_INT64)
inline UInt64 ByteOrder::flipBytes(UInt64 value)
{
#if defined(POCO_HAVE_MSC_BYTESWAP)
return _byteswap_uint64(value);
#elif defined(POCO_HAVE_GCC_BYTESWAP)
return __builtin_bswap64(value);
#else
UInt32 hi = UInt32(value >> 32);
UInt32 lo = UInt32(value & 0xFFFFFFFF);
return UInt64(flipBytes(hi)) | (UInt64(flipBytes(lo)) << 32);
#endif
}
inline Int64 ByteOrder::flipBytes(Int64 value)
{
return Int64(flipBytes(UInt64(value)));
}
#endif // POCO_HAVE_INT64
//
// some macro trickery to automate the method implementation
//
#define POCO_IMPLEMENT_BYTEORDER_NOOP_(op, type) \
inline type ByteOrder::op(type value) \
{ \
return value; \
}
#define POCO_IMPLEMENT_BYTEORDER_FLIP_(op, type) \
inline type ByteOrder::op(type value) \
{ \
return flipBytes(value); \
}
#if defined(POCO_HAVE_INT64)
#define POCO_IMPLEMENT_BYTEORDER_NOOP(op) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int8) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt8) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int16) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt16) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int32) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt32) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int64) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt64)
#define POCO_IMPLEMENT_BYTEORDER_FLIP(op) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int8) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt8) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int16) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt16) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int32) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt32) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int64) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt64)
#else
#define POCO_IMPLEMENT_BYTEORDER_NOOP(op) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int8) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt8) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int16) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt16) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, Int32) \
POCO_IMPLEMENT_BYTEORDER_NOOP_(op, UInt32)
#define POCO_IMPLEMENT_BYTEORDER_FLIP(op) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int8) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt8) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int16) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt16) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, Int32) \
POCO_IMPLEMENT_BYTEORDER_FLIP_(op, UInt32)
#endif
#if defined(POCO_ARCH_BIG_ENDIAN)
#define POCO_IMPLEMENT_BYTEORDER_BIG POCO_IMPLEMENT_BYTEORDER_NOOP
#define POCO_IMPLEMENT_BYTEORDER_LIT POCO_IMPLEMENT_BYTEORDER_FLIP
#else
#define POCO_IMPLEMENT_BYTEORDER_BIG POCO_IMPLEMENT_BYTEORDER_FLIP
#define POCO_IMPLEMENT_BYTEORDER_LIT POCO_IMPLEMENT_BYTEORDER_NOOP
#endif
POCO_IMPLEMENT_BYTEORDER_BIG(toBigEndian)
POCO_IMPLEMENT_BYTEORDER_BIG(fromBigEndian)
POCO_IMPLEMENT_BYTEORDER_BIG(toNetwork)
POCO_IMPLEMENT_BYTEORDER_BIG(fromNetwork)
POCO_IMPLEMENT_BYTEORDER_LIT(toLittleEndian)
POCO_IMPLEMENT_BYTEORDER_LIT(fromLittleEndian)
} // namespace Poco
#endif // Foundation_ByteOrder_INCLUDED
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