/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * 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. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * 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_OSREFERENCE_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) /************************/ /* 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)) #else #warning Unknown byte order #error #endif #ifdef __cplusplus extern "C" { #endif /* * Constants for the "unswap" argument to hfs_swap_BTNode: */ enum HFSBTSwapDirection { kSwapBTNodeBigToHost = 0, kSwapBTNodeHostToBig = 1, /* * kSwapBTNodeHeaderRecordOnly is used to swap just the header record * of a header node from big endian (on disk) to host endian (in memory). * It does not swap the node descriptor (forward/backward links, record * count, etc.). It assumes the header record is at offset 0x000E. * * Since HFS Plus doesn't have fixed B-tree node sizes, we have to read * the header record to determine the actual node size for that tree * before we can set up the B-tree control block. We read it initially * as 512 bytes, then re-read it once we know the correct node size. Since * we may not have read the entire header node the first time, we can't * swap the record offsets, other records, or do most sanity checks. */ kSwapBTNodeHeaderRecordOnly = 3 }; int hfs_swap_BTNode (BlockDescriptor *src, vnode_t vp, enum HFSBTSwapDirection direction); #ifdef __cplusplus } #endif #endif /* __APPLE_API_PRIVATE */ #endif /* KERNEL */ #endif /* __HFS_FORMAT__ */