projects / apple / xnu.git / blame
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|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
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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. | |
| 1c79356b | 11 | * |
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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 | |
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14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
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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. | |
| 1c79356b A |
19 | * |
| 20 | * @APPLE_LICENSE_HEADER_END@ | |
| 21 | */ | |
| 22 | #ifndef __HFS_ENDIAN_H__ | |
| 23 | #define __HFS_ENDIAN_H__ | |
| 24 | ||
| 9bccf70c A |
25 | #include <sys/appleapiopts.h> |
| 26 | ||
| 27 | #ifdef KERNEL | |
| 28 | #ifdef __APPLE_API_PRIVATE | |
| 1c79356b A |
29 | /* |
| 30 | * hfs_endian.h | |
| 31 | * | |
| 32 | * This file prototypes endian swapping routines for the HFS/HFS Plus | |
| 33 | * volume format. | |
| 34 | */ | |
| 35 | #include "hfs.h" | |
| 36 | #include "hfscommon/headers/BTreesInternal.h" | |
| c0fea474 | 37 | #include <libkern/OSByteOrder.h> |
| 1c79356b A |
38 | |
| 39 | /*********************/ | |
| 40 | /* BIG ENDIAN Macros */ | |
| 41 | /*********************/ | |
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42 | #define SWAP_BE16(__a) OSSwapBigToHostInt16 (__a) |
| 43 | #define SWAP_BE32(__a) OSSwapBigToHostInt32 (__a) | |
| 44 | #define SWAP_BE64(__a) OSSwapBigToHostInt64 (__a) | |
| 1c79356b | 45 | |
| c0fea474 | 46 | #if BYTE_ORDER == BIG_ENDIAN |
| 1c79356b A |
47 | |
| 48 | /* HFS is always big endian, no swapping needed */ | |
| 49 | #define SWAP_HFS_PLUS_FORK_DATA(__a) | |
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50 | |
| 51 | /************************/ | |
| 52 | /* LITTLE ENDIAN Macros */ | |
| 53 | /************************/ | |
| 54 | #elif BYTE_ORDER == LITTLE_ENDIAN | |
| 55 | ||
| 1c79356b | 56 | #define SWAP_HFS_PLUS_FORK_DATA(__a) hfs_swap_HFSPlusForkData ((__a)) |
| 1c79356b A |
57 | |
| 58 | #else | |
| 59 | #warning Unknown byte order | |
| 60 | #error | |
| 61 | #endif | |
| 62 | ||
| 63 | #ifdef __cplusplus | |
| 64 | extern "C" { | |
| 65 | #endif | |
| 66 | ||
| 3a60a9f5 A |
67 | /* |
| 68 | * Constants for the "unswap" argument to hfs_swap_BTNode: | |
| 69 | */ | |
| 70 | enum HFSBTSwapDirection { | |
| 71 | kSwapBTNodeBigToHost = 0, | |
| 72 | kSwapBTNodeHostToBig = 1, | |
| 73 | ||
| 74 | /* | |
| 75 | * kSwapBTNodeHeaderRecordOnly is used to swap just the header record | |
| 76 | * of a header node from big endian (on disk) to host endian (in memory). | |
| 77 | * It does not swap the node descriptor (forward/backward links, record | |
| 78 | * count, etc.). It assumes the header record is at offset 0x000E. | |
| 79 | * | |
| 80 | * Since HFS Plus doesn't have fixed B-tree node sizes, we have to read | |
| 81 | * the header record to determine the actual node size for that tree | |
| 82 | * before we can set up the B-tree control block. We read it initially | |
| 83 | * as 512 bytes, then re-read it once we know the correct node size. Since | |
| 84 | * we may not have read the entire header node the first time, we can't | |
| 85 | * swap the record offsets, other records, or do most sanity checks. | |
| 86 | */ | |
| 87 | kSwapBTNodeHeaderRecordOnly = 3 | |
| 88 | }; | |
| 89 | ||
| 90 | int hfs_swap_BTNode (BlockDescriptor *src, vnode_t vp, enum HFSBTSwapDirection direction); | |
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91 | |
| 92 | #ifdef __cplusplus | |
| 93 | } | |
| 94 | #endif | |
| 95 | ||
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96 | #endif /* __APPLE_API_PRIVATE */ |
| 97 | #endif /* KERNEL */ | |
| 1c79356b | 98 | #endif /* __HFS_FORMAT__ */ |