/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#ifndef _OSL_ENDIAN_H_
#define _OSL_ENDIAN_H_

#include <sal/types.h>

#ifdef __cplusplus
extern "C" {
#endif

/** Determine the platform byte order as _BIG_ENDIAN, _LITTLE_ENDIAN, ...
 */
#ifdef _WIN32
#	if defined(_M_IX86)
#		define _LITTLE_ENDIAN
#	elif defined(_M_MRX000)
#		define _LITTLE_ENDIAN
#	elif defined(_M_ALPHA)
#		define _LITTLE_ENDIAN
#	elif defined(_M_PPC)
#		define _LITTLE_ENDIAN
#	endif
#endif

#ifdef LINUX
#	include <endian.h>
#	if __BYTE_ORDER == __LITTLE_ENDIAN
#           ifndef _LITTLE_ENDIAN
#		define _LITTLE_ENDIAN
#           endif
#	elif __BYTE_ORDER == __BIG_ENDIAN
#           ifndef _BIG_ENDIAN
#		define _BIG_ENDIAN
#           endif
#	elif __BYTE_ORDER == __PDP_ENDIAN
#		define _PDP_ENDIAN
#	endif
#endif

#ifdef NETBSD
#   include <machine/endian.h>
#   if BYTE_ORDER == LITTLE_ENDIAN
#   	define _LITTLE_ENDIAN
#   elif BYTE_ORDER == BIG_ENDIAN
#   	define _BIG_ENDIAN
#   elif BYTE_ORDER == PDP_ENDIAN
#   	define _PDP_ENDIAN
#   endif
#endif

#ifdef FREEBSD
#   include <sys/param.h>
#   include <machine/endian.h>
#if __FreeBSD_version < 500000
#   if BYTE_ORDER == LITTLE_ENDIAN
#   	define _LITTLE_ENDIAN
#   elif BYTE_ORDER == BIG_ENDIAN
#   	define _BIG_ENDIAN
#   elif BYTE_ORDER == PDP_ENDIAN
#   	define _PDP_ENDIAN
#   endif
#endif
#endif

#ifdef SCO
#   include <sys/types.h>
#   include <sys/byteorder.h>
#   if BYTE_ORDER == LITTLE_ENDIAN
#   	define _LITTLE_ENDIAN
#   elif BYTE_ORDER == BIG_ENDIAN
#   	define _BIG_ENDIAN
#   elif BYTE_ORDER == PDP_ENDIAN
#   	define _PDP_ENDIAN
#   endif
#endif

#ifdef AIX
#	include <sys/machine.h>
#   if BYTE_ORDER == LITTLE_ENDIAN
#   	define _LITTLE_ENDIAN
#   elif BYTE_ORDER == BIG_ENDIAN
#   	define _BIG_ENDIAN
#   elif BYTE_ORDER == PDP_ENDIAN
#   	define _PDP_ENDIAN
#   endif
#endif

#ifdef HPUX
#	include <machine/param.h>
#endif

#ifdef _WIN16
#	define	_LITTLE_ENDIAN
#endif

#ifdef OS2
#	include <machine/endian.h>
#endif

#ifdef SOLARIS
#	include <sys/isa_defs.h>
#endif

#ifdef MACOSX
#	include <machine/endian.h>
#	if BYTE_ORDER == LITTLE_ENDIAN
#		ifndef _LITTLE_ENDIAN
#		define _LITTLE_ENDIAN
#		endif
#	elif BYTE_ORDER == BIG_ENDIAN
#		ifndef _BIG_ENDIAN
#		define _BIG_ENDIAN
#		endif
#	elif BYTE_ORDER == PDP_ENDIAN
#		ifndef _PDP_ENDIAN
#		define _PDP_ENDIAN
#		endif
#	endif
#endif

/** Check supported platform.
 */
#if !defined(_WIN32)  && !defined(_WIN16) && !defined(OS2)   && \
    !defined(LINUX)   && !defined(NETBSD) && !defined(SCO)   && \
	!defined(AIX)     && !defined(HPUX)   && \
	!defined(SOLARIS) && !defined(MACOSX) && !defined(FREEBSD)
#	error "Target platform not specified !"
#endif


/** Define the determined byte order as OSL_BIGENDIAN or OSL_LITENDIAN.
 */
#if defined _LITTLE_ENDIAN
#	define OSL_LITENDIAN
#elif defined _BIG_ENDIAN
#	define OSL_BIGENDIAN
#else
#	error undetermined endianness
#endif


/** Define macros for byte order manipulation.
 */
#ifndef OSL_MAKEBYTE
#	define OSL_MAKEBYTE(nl, nh)    ((sal_uInt8)(((nl) & 0x0F) | (((nh) & 0x0F) << 4)))
#endif
#ifndef OSL_LONIBBLE
#	define OSL_LONIBBLE(b)         ((sal_uInt8)((b) & 0x0F))
#endif
#ifndef OSL_HINIBBLE
#	define OSL_HINIBBLE(b)         ((sal_uInt8)(((b) >> 4) & 0x0F))
#endif

#ifndef OSL_MAKEWORD
#	define OSL_MAKEWORD(bl, bh)    ((sal_uInt16)((bl) & 0xFF) | (((sal_uInt16)(bh) & 0xFF) << 8))
#endif
#ifndef OSL_LOBYTE
#	define OSL_LOBYTE(w)           ((sal_uInt8)((sal_uInt16)(w) & 0xFF))
#endif
#ifndef OSL_HIBYTE
#	define OSL_HIBYTE(w)           ((sal_uInt8)(((sal_uInt16)(w) >> 8) & 0xFF))
#endif

#ifndef OSL_MAKEDWORD
#	define OSL_MAKEDWORD(wl, wh)   ((sal_uInt32)((wl) & 0xFFFF) | (((sal_uInt32)(wh) & 0xFFFF) << 16))
#endif
#ifndef OSL_LOWORD
#	define OSL_LOWORD(d)           ((sal_uInt16)((sal_uInt32)(d) & 0xFFFF))
#endif
#ifndef OSL_HIWORD
#	define OSL_HIWORD(d)           ((sal_uInt16)(((sal_uInt32)(d) >> 16) & 0xFFFF))
#endif


/** Define macros for swapping between host and network byte order.
 */
#ifdef OSL_BIGENDIAN
#ifndef OSL_NETWORD
#	define OSL_NETWORD(w)          (sal_uInt16)(w)
#endif
#ifndef OSL_NETDWORD
#	define OSL_NETDWORD(d)         (sal_uInt32)(d)
#endif
#else  /* OSL_LITENDIAN */
#ifndef OSL_NETWORD
#	define OSL_NETWORD(w)          OSL_MAKEWORD(OSL_HIBYTE(w),OSL_LOBYTE(w))
#endif
#ifndef OSL_NETDWORD
#	define OSL_NETDWORD(d)         OSL_MAKEDWORD(OSL_NETWORD(OSL_HIWORD(d)),OSL_NETWORD(OSL_LOWORD(d)))
#endif
#endif /* OSL_BIGENDIAN */


/** Define macros for swapping between byte orders.
 */
#ifndef OSL_SWAPWORD
#	define OSL_SWAPWORD(w)         OSL_MAKEWORD(OSL_HIBYTE(w),OSL_LOBYTE(w))
#endif
#ifndef OSL_SWAPDWORD
#	define OSL_SWAPDWORD(d)        OSL_MAKEDWORD(OSL_SWAPWORD(OSL_HIWORD(d)),OSL_SWAPWORD(OSL_LOWORD(d)))
#endif


#ifdef __cplusplus
}
#endif

#endif /*_OSL_ENDIAN_H_ */