bsd/hfs/hfs_endian.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 #ifndef __HFS_ENDIAN_H__
  26 #define __HFS_ENDIAN_H__
  27
  28 #include <sys/appleapiopts.h>
  29
  30 #ifdef KERNEL
  31 #ifdef __APPLE_API_PRIVATE
  32 /*
  33  * hfs_endian.h
  34  *
  35  * This file prototypes endian swapping routines for the HFS/HFS Plus
  36  * volume format.
  37  */
  38 #include "hfs.h"
  39 #include "hfscommon/headers/BTreesInternal.h"
  40 #include <architecture/byte_order.h>
  41
  42 /*********************/
  43 /* BIG ENDIAN Macros */
  44 /*********************/
  45 #if BYTE_ORDER == BIG_ENDIAN
  46
  47     /* HFS is always big endian, make swaps into no-ops */
  48     #define SWAP_BE16(__a) (__a)
  49     #define SWAP_BE32(__a) (__a)
  50     #define SWAP_BE64(__a) (__a)
  51
  52     /* HFS is always big endian, no swapping needed */
  53     #define SWAP_HFS_PLUS_FORK_DATA(__a)
  54     #define SWAP_BT_NODE(__a, __b, __c)
  55
  56 /************************/
  57 /* LITTLE ENDIAN Macros */
  58 /************************/
  59 #elif BYTE_ORDER == LITTLE_ENDIAN
  60
  61     /* HFS is always big endian, make swaps actually swap */
  62     #define SWAP_BE16(__a)                                                      NXSwapBigShortToHost (__a)
  63     #define SWAP_BE32(__a)                                                      NXSwapBigLongToHost (__a)
  64     #define SWAP_BE64(__a)                                                      NXSwapBigLongLongToHost (__a)
  65
  66     #define SWAP_HFS_PLUS_FORK_DATA(__a)                        hfs_swap_HFSPlusForkData ((__a))
  67     #define SWAP_BT_NODE(__a, __b, __c, __d)    hfs_swap_BTNode ((__a), (__b), (__c), (__d))
  68
  69 #else
  70 #warning Unknown byte order
  71 #error
  72 #endif
  73
  74 #ifdef __cplusplus
  75 extern "C" {
  76 #endif
  77
  78 void hfs_swap_HFSPlusForkData (HFSPlusForkData *src);
  79 int  hfs_swap_BTNode (BlockDescriptor *src, int isHFSPlus, HFSCatalogNodeID fileID, int unswap);
  80
  81 #ifdef __cplusplus
  82 }
  83 #endif
  84
  85 #endif /* __APPLE_API_PRIVATE */
  86 #endif /* KERNEL */
  87 #endif /* __HFS_FORMAT__ */