FreeBSD/Linux Kernel Cross Reference
sys/bsd/hfs/hfs_endian.h

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    #ifndef __HFS_ENDIAN_H__
    #define __HFS_ENDIAN_H__
    
    #include <sys/appleapiopts.h>
    
    #ifdef KERNEL
    #ifdef __APPLE_API_PRIVATE
    /*
     * hfs_endian.h
     *
     * This file prototypes endian swapping routines for the HFS/HFS Plus
     * volume format.
     */
    #include "hfs.h"
    #include "hfscommon/headers/BTreesInternal.h"
    #include <architecture/byte_order.h>
    
    /*********************/
    /* BIG ENDIAN Macros */
    /*********************/
    #if BYTE_ORDER == BIG_ENDIAN
    
        /* HFS is always big endian, make swaps into no-ops */
        #define SWAP_BE16(__a) (__a)
        #define SWAP_BE32(__a) (__a)
        #define SWAP_BE64(__a) (__a)
        
        /* HFS is always big endian, no swapping needed */
        #define SWAP_HFS_PLUS_FORK_DATA(__a)
        #define SWAP_BT_NODE(__a, __b, __c, __d)
    
    /************************/
    /* LITTLE ENDIAN Macros */
    /************************/
    #elif BYTE_ORDER == LITTLE_ENDIAN
    
        /* HFS is always big endian, make swaps actually swap */
        #define SWAP_BE16(__a)                                                      NXSwapBigShortToHost (__a)
        #define SWAP_BE32(__a)                                                      NXSwapBigLongToHost (__a)
        #define SWAP_BE64(__a)                                                      NXSwapBigLongLongToHost (__a)
        
        #define SWAP_HFS_PLUS_FORK_DATA(__a)                        hfs_swap_HFSPlusForkData ((__a))
        #define SWAP_BT_NODE(__a, __b, __c, __d)    hfs_swap_BTNode ((__a), (__b), (__c), (__d))
    
    #else
    #warning Unknown byte order
    #error
    #endif
    
    #ifdef __cplusplus
    extern "C" {
    #endif
    
    void hfs_swap_HFSPlusForkData (HFSPlusForkData *src);
    int  hfs_swap_BTNode (BlockDescriptor *src, int isHFSPlus, HFSCatalogNodeID fileID, int unswap);
    
    #ifdef __cplusplus
    }
    #endif
    
    #endif /* __APPLE_API_PRIVATE */
    #endif /* KERNEL */
    #endif /* __HFS_FORMAT__ */

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