1/* 2 * Copyright (c) 2000, 2002-2003, 2005-2008 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_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. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28#ifndef __HFS_ENDIAN_H__ 29#define __HFS_ENDIAN_H__ 30 31#include <sys/appleapiopts.h> 32 33#ifdef KERNEL 34#ifdef __APPLE_API_PRIVATE 35/* 36 * hfs_endian.h 37 * 38 * This file prototypes endian swapping routines for the HFS/HFS Plus 39 * volume format. 40 */ 41#include "hfs.h" 42#include "hfscommon/headers/BTreesInternal.h" 43#include <libkern/OSByteOrder.h> 44 45/*********************/ 46/* BIG ENDIAN Macros */ 47/*********************/ 48#define SWAP_BE16(__a) OSSwapBigToHostInt16 (__a) 49#define SWAP_BE32(__a) OSSwapBigToHostInt32 (__a) 50#define SWAP_BE64(__a) OSSwapBigToHostInt64 (__a) 51 52#if BYTE_ORDER == BIG_ENDIAN 53 54 /* HFS is always big endian, no swapping needed */ 55 #define SWAP_HFS_PLUS_FORK_DATA(__a) 56 57/************************/ 58/* LITTLE ENDIAN Macros */ 59/************************/ 60#elif BYTE_ORDER == LITTLE_ENDIAN 61 62 #define SWAP_HFS_PLUS_FORK_DATA(__a) hfs_swap_HFSPlusForkData ((__a)) 63 64#else 65#warning Unknown byte order 66#error 67#endif 68 69#ifdef __cplusplus 70extern "C" { 71#endif 72 73/* 74 * Constants for the "unswap" argument to hfs_swap_BTNode: 75 */ 76enum HFSBTSwapDirection { 77 kSwapBTNodeBigToHost = 0, 78 kSwapBTNodeHostToBig = 1, 79 80 /* 81 * kSwapBTNodeHeaderRecordOnly is used to swap just the header record 82 * of a header node from big endian (on disk) to host endian (in memory). 83 * It does not swap the node descriptor (forward/backward links, record 84 * count, etc.). It assumes the header record is at offset 0x000E. 85 * 86 * Since HFS Plus doesn't have fixed B-tree node sizes, we have to read 87 * the header record to determine the actual node size for that tree 88 * before we can set up the B-tree control block. We read it initially 89 * as 512 bytes, then re-read it once we know the correct node size. Since 90 * we may not have read the entire header node the first time, we can't 91 * swap the record offsets, other records, or do most sanity checks. 92 */ 93 kSwapBTNodeHeaderRecordOnly = 3 94}; 95 96int hfs_swap_BTNode (BlockDescriptor *src, vnode_t vp, enum HFSBTSwapDirection direction, 97 u_int8_t allow_empty_node); 98 99#ifdef __cplusplus 100} 101#endif 102 103#endif /* __APPLE_API_PRIVATE */ 104#endif /* KERNEL */ 105#endif /* __HFS_FORMAT__ */ 106