bsd/hfs/hfs_endian.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 #ifndef __HFS_ENDIAN_H__
  23 #define __HFS_ENDIAN_H__
  24
  25 /*
  26  * hfs_endian.h
  27  *
  28  * This file prototypes endian swapping routines for the HFS/HFS Plus
  29  * volume format.
  30  */
  31 #include "hfs.h"
  32 #include "hfscommon/headers/BTreesInternal.h"
  33 #include <architecture/byte_order.h>
  34
  35 /*********************/
  36 /* BIG ENDIAN Macros */
  37 /*********************/
  38 #if BYTE_ORDER == BIG_ENDIAN
  39
  40     /* HFS is always big endian, make swaps into no-ops */
  41     #define SWAP_BE16(__a) (__a)
  42     #define SWAP_BE32(__a) (__a)
  43     #define SWAP_BE64(__a) (__a)
  44
  45     /* HFS is always big endian, no swapping needed */
  46     #define SWAP_HFS_PLUS_FORK_DATA(__a)
  47     #define SWAP_BT_NODE(__a, __b, __c)
  48
  49 /************************/
  50 /* LITTLE ENDIAN Macros */
  51 /************************/
  52 #elif BYTE_ORDER == LITTLE_ENDIAN
  53
  54     /* HFS is always big endian, make swaps actually swap */
  55     #define SWAP_BE16(__a)                                                      NXSwapBigShortToHost (__a)
  56     #define SWAP_BE32(__a)                                                      NXSwapBigLongToHost (__a)
  57     #define SWAP_BE64(__a)                                                      NXSwapBigLongLongToHost (__a)
  58
  59     #define SWAP_HFS_PLUS_FORK_DATA(__a)                        hfs_swap_HFSPlusForkData ((__a))
  60     #define SWAP_BT_NODE(__a, __b, __c, __d)    hfs_swap_BTNode ((__a), (__b), (__c), (__d))
  61
  62 #else
  63 #warning Unknown byte order
  64 #error
  65 #endif
  66
  67 #ifdef __cplusplus
  68 extern "C" {
  69 #endif
  70
  71 void hfs_swap_HFSPlusForkData (HFSPlusForkData *src);
  72 int  hfs_swap_BTNode (BlockDescriptor *src, int isHFSPlus, HFSCatalogNodeID fileID, int unswap);
  73
  74 #ifdef __cplusplus
  75 }
  76 #endif
  77
  78 #endif /* __HFS_FORMAT__ */