byteorder.h

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// ByteOrder.h
//
// $Id: //poco/Main/Foundation/include/Foundation/ByteOrder.h#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#ifndef Foundation_ByteOrder_INCLUDED
#define Foundation_ByteOrder_INCLUDED


#ifndef Foundation_Foundation_INCLUDED
#include "Foundation/Foundation.h"
#endif
#ifndef Foundation_Types_INCLUDED
#include "Foundation/Types.h"
#endif


Foundation_BEGIN


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 Int16 flipBytes(Int16 value);
	static UInt16 flipBytes(UInt16 value);
	static Int32 flipBytes(Int32 value);
	static UInt32 flipBytes(UInt32 value);
#if defined(POCO_HAVE_INT64)
	static Int64 flipBytes(Int64 value);
	static UInt64 flipBytes(UInt64 value);
#endif

	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 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 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 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 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 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
};


//
// inlines
//
inline UInt16 ByteOrder::flipBytes(UInt16 value)
{
	return ((value >> 8) & 0x00FF) | ((value << 8) & 0xFF00);
}


inline Int16 ByteOrder::flipBytes(Int16 value)
{
	return Int16(flipBytes(UInt16(value)));
}


inline UInt32 ByteOrder::flipBytes(UInt32 value)
{
	return ((value >> 24) & 0x000000FF) | ((value >> 8) & 0x0000FF00)
	     | ((value << 8) & 0x00FF0000) | ((value << 24) & 0xFF000000);
}


inline Int32 ByteOrder::flipBytes(Int32 value)
{
	return Int32(flipBytes(UInt32(value)));
}


#if defined(POCO_HAVE_INT64)
inline UInt64 ByteOrder::flipBytes(UInt64 value)
{
	UInt32 hi = UInt32(value >> 32);
	UInt32 lo = UInt32(value & 0xFFFFFFFF);
	return UInt64(flipBytes(hi)) | (UInt64(flipBytes(lo)) << 32);
}


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, 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, 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, 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, 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)


Foundation_END


#endif // Foundation_ByteOrder_INCLUDED