mount_hfs/hfs_endian.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #ifndef __HFS_ENDIAN_H__
  24 #define __HFS_ENDIAN_H__
  25
  26 /*
  27  * hfs_endian.h
  28  *
  29  * This file prototypes endian swapping routines for the HFS/HFS Plus
  30  * volume format.
  31  */
  32 #include <libkern/OSByteOrder.h>
  33
  34 /*********************/
  35 /* BIG ENDIAN Macros */
  36 /*********************/
  37 #if BYTE_ORDER == BIG_ENDIAN
  38     /* HFS is always big endian, make swaps into no-ops */
  39     #define SWAP_BE16(__a) (__a)
  40     #define SWAP_BE32(__a) (__a)
  41     #define SWAP_BE64(__a) (__a)
  42
  43 /************************/
  44 /* LITTLE ENDIAN Macros */
  45 /************************/
  46 #elif BYTE_ORDER == LITTLE_ENDIAN
  47     /* HFS is always big endian, make swaps actually swap */
  48     #define SWAP_BE16(__a)                                                      OSSwapBigToHostInt16 (__a)
  49     #define SWAP_BE32(__a)                                                      OSSwapBigToHostInt32 (__a)
  50     #define SWAP_BE64(__a)                                                      OSSwapBigToHostInt64 (__a)
  51
  52 #else
  53 #warning Unknown byte order
  54 #error
  55 #endif
  56
  57 #endif /* __HFS_ENDIAN__ */