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/usr/include/hfsplus/swab.h is in libhfsp-dev 1.0.4-12.1.

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/*
 * libhfs - library for reading and writing Macintosh HFS volumes
 *
 * Copyright (C) 2000 Klaus Halfmann <klaus.halfmann@feri.de>
 * Original work 1996-1998 Robert Leslie <rob@mars.org>
 *
 * This file defines some byte swapping function. I did not find this
 * in any standard or linux way.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: swab.h,v 1.1.1.1 2002/03/05 19:50:29 klaus Exp $
 */

#include <endian.h>
#include <byteswap.h> 

 /* basic fuction:
    value = swab_inc(ptr);
	ptr is afterwards incremented by sizeof(value)
 */

#if BYTE_ORDER == LITTLE_ENDIAN

#define bswabU16(val) bswap_16(val)

#define bswabU16_inc(ptr) bswap_16(*((UInt16*) (ptr))); ptr = (UInt16*)ptr + 1
#define bswabU32_inc(ptr) bswap_32(*((UInt32*) (ptr))); ptr = (UInt32*)ptr + 1
#define bswabU64_inc(ptr) bswap_64(*((UInt64*) (ptr))); ptr = (UInt64*)ptr + 1

#define bstoreU16_inc(ptr, val) *((UInt16*) (ptr)) = bswap_16(val); ptr = (UInt16*)ptr + 1
#define bstoreU32_inc(ptr, val) *((UInt32*) (ptr)) = bswap_32(val); ptr = (UInt32*)ptr + 1;
#define bstoreU64_inc(ptr, val) *((UInt64*) (ptr)) = bswap_64(val); ptr = (UInt32*)ptr + 1;

#else // BYTE_ORDER == BIG_ENDIAN

#define bswabU16(val) val

#define bswabU16_inc(ptr) *((UInt16*) (ptr)); ptr = (UInt16*)ptr + 1
/* Only available as a GCC extension, but required on sparc due to
   alignment issues in some of the on-disk structs */
#if defined(__GNUC__) && defined(__sparc__)
#define bswabU32_inc(ptr) ({			\
	unsigned char *c = (char*)ptr;		\
	ptr = ((UInt32 *)ptr) + 1;		\
	((c[0] << 24)+(c[1] << 16)+(c[2] << 8)+c[3]);})
#define bswabU64_inc(ptr) ({			\
	unsigned char *c = (char*)ptr;		\
	UInt64 val = 0;				\
	int i = 0;				\
	ptr = ((UInt64 *)ptr) + 1;		\
	while (i < 8)				\
		val += (c[i] << (8*(7-i++)));	\
	val;})
#else
#define bswabU32_inc(ptr) *((UInt32*) (ptr)); ptr = (UInt32*)ptr + 1
#define bswabU64_inc(ptr) *((UInt64*) (ptr)); ptr = (UInt64*)ptr + 1
#endif

#define bstoreU16_inc(ptr, val) *((UInt16*) (ptr)) = val; ptr = (UInt16*)ptr + 1
#define bstoreU32_inc(ptr, val) *((UInt32*) (ptr)) = val; ptr = (UInt32*)ptr + 1
#define bstoreU64_inc(ptr, val) *((UInt64*) (ptr)) = val; ptr = (UInt64*)ptr + 1

#endif

/* for the sake of compleetness and readability */
#define bswabU8_inc(ptr)	*((UInt8*) (ptr)); ptr = (UInt8*)ptr + 1
#define bstoreU8_inc(ptr,val)	*((UInt8*) (ptr)) = val; ptr = (UInt8*)ptr + 1