Deliver/include/droc_header/endian.hpp

/***************************************************************************
 * E-Com Technology Ltd.
 *
 * ECOMPACS DICOM Network Transport Libraries * Version 0.1 Beta
 ***************************************************************************/

//////////////////////////////////////////////////////////////////////
// Architectually Neutral Endian types.
//
// Note these are not done with C++ templates.  This is a design choice.
//////////////////////////////////////////////////////////////////////


#if	NATIVE_ENDIAN == LITTLE_ENDIAN

//////////////////////////////////////////////////////////////////////
// pack c1 and c2 into u1
inline void Pack (BYTE c1, BYTE c2, UINT16 & u1)
{
	u1 = ( ( (UINT16)c1)<<8)+ ( (UINT16)c2);	// little endian
}

//////////////////////////////////////////////////////////////////////
// unpack c1 and c2 from u1
inline void Pack (UINT16 u1, BYTE & c1, BYTE & c2)
{
	c1 = (u1 >> 8);		// little endian
	c2 = (u1 & 0xff);
}

#else

//////////////////////////////////////////////////////////////////////
// pack c1 and c2 into u1
inline void Pack (BYTE c1, BYTE c2, UINT16 & u1)
{
	u1 = ( ( (UINT16)c2)<<8)+ ( (UINT16)c1);	// big endian
}

//////////////////////////////////////////////////////////////////////
// unpack c1 and c2 from u1
inline void Pack (UINT16 u1, BYTE & c1, BYTE & c2)
{
	c2 = (u1 >> 8);		// big endian
	c1 = (u1 & 0xff);
}

#endif


inline UINT16 SwitchEndian(UINT16  x)
{
	return ( ((x >> 8) & 0x00ff) | ((x << 8) & 0xff00) );
}

inline UINT32 SwitchEndian(UINT32  x)
{
	return ( ((UINT32)  SwitchEndian ((UINT16) (x >> 16))) |
			 ((UINT32) (SwitchEndian ((UINT16) (x & 0x0000ffff)) << 16) ));
}

inline INT16 SwitchEndian(INT16  x)
{
	return ((INT16) SwitchEndian((UINT16) x) );
}

inline INT32 SwitchEndian(INT32  x)
{
	return ((INT32) SwitchEndian((UINT32) x) );
}


#if	NATIVE_ENDIAN == LITTLE_ENDIAN
	#define	LE_UINT16	UINT16
	#define	LE_UINT32	UINT32
	#define	LE_INT16	INT16
	#define	LE_INT32	INT32

	#define	XE_UINTX	BE_UINT16
	#define	UINTX		UINT16
	#undef	XE_UINTX
	#undef	UINTX

	#define	XE_UINTX	BE_UINT32
	#define	UINTX		UINT32
	#undef	XE_UINTX
	#undef	UINTX

	#define	XE_UINTX	BE_INT16
	#define	UINTX		INT16
	#undef	XE_UINTX
	#undef	UINTX

	#define	XE_UINTX	BE_INT32
	#define	UINTX		INT32
	#undef	XE_UINTX
	#undef	UINTX
#else
	#define	BE_UINT16	UINT16
	#define	BE_UINT32	UINT32
	#define	BE_INT16	INT16
	#define	BE_INT32	INT32

	#define	XE_UINTX	LE_UINT16
	#define	UINTX		UINT16
	#undef	XE_UINTX
	#undef	UINTX

	#define	XE_UINTX	LE_UINT32
	#define	UINTX		UINT32
	#undef	XE_UINTX
	#undef	UINTX

	#define	XE_UINTX	LE_INT16
	#define	UINTX		INT16
	#undef	XE_UINTX
	#undef	UINTX

	#define	XE_UINTX	LE_INT32
	#define	UINTX		INT32
	#undef	XE_UINTX
	#undef	UINTX
#endif