projects / apple / hfs.git / blame
| Commit | Line | Data |
|---|---|---|
| 51e135ce A |
1 | /* |
| 2 | * Copyright (c) 2000, 2005 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_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. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | #ifndef __HFS_ENDIAN_H__ | |
| 24 | #define __HFS_ENDIAN_H__ | |
| 25 | ||
| 26 | /* | |
| 27 | * hfs_endian.h | |
| 28 | * | |
| 29 | * This file prototypes endian swapping routines for the HFS/HFS Plus | |
| 30 | * volume format. | |
| 31 | */ | |
| 32 | #include <hfs/hfs_format.h> | |
| 33 | #include <libkern/OSByteOrder.h> | |
| 34 | #include "SRuntime.h" | |
| 35 | ||
| 36 | /*********************/ | |
| 37 | /* BIG ENDIAN Macros */ | |
| 38 | /*********************/ | |
| 39 | #define SWAP_BE16(__a) OSSwapBigToHostInt16 (__a) | |
| 40 | #define SWAP_BE32(__a) OSSwapBigToHostInt32 (__a) | |
| 41 | #define SWAP_BE64(__a) OSSwapBigToHostInt64 (__a) | |
| 42 | ||
| 43 | #if BYTE_ORDER == BIG_ENDIAN | |
| 44 | ||
| 45 | /* HFS is always big endian, no swapping needed */ | |
| 46 | #define SWAP_HFSMDB(__a) | |
| 47 | #define SWAP_HFSPLUSVH(__a) | |
| 48 | ||
| 49 | /************************/ | |
| 50 | /* LITTLE ENDIAN Macros */ | |
| 51 | /************************/ | |
| 52 | #elif BYTE_ORDER == LITTLE_ENDIAN | |
| 53 | ||
| 54 | #define SWAP_HFSMDB(__a) hfs_swap_HFSMasterDirectoryBlock ((__a)) | |
| 55 | #define SWAP_HFSPLUSVH(__a) hfs_swap_HFSPlusVolumeHeader ((__a)) | |
| 56 | ||
| 57 | #else | |
| 58 | #warning Unknown byte order | |
| 59 | #error | |
| 60 | #endif | |
| 61 | ||
| 62 | #ifdef __cplusplus | |
| 63 | extern "C" { | |
| 64 | #endif | |
| 65 | ||
| 66 | /* | |
| 67 | * Constants for the "unswap" argument to hfs_swap_BTNode: | |
| 68 | */ | |
| 69 | enum HFSBTSwapDirection { | |
| 70 | kSwapBTNodeBigToHost = 0, | |
| 71 | kSwapBTNodeHostToBig = 1, | |
| 72 | ||
| 73 | /* | |
| 74 | * kSwapBTNodeHeaderRecordOnly is used to swap just the header record | |
| 75 | * of a header node from big endian (on disk) to host endian (in memory). | |
| 76 | * It does not swap the node descriptor (forward/backward links, record | |
| 77 | * count, etc.). It assumes the header record is at offset 0x000E. | |
| 78 | * | |
| 79 | * Since HFS Plus doesn't have fixed B-tree node sizes, we have to read | |
| 80 | * the header record to determine the actual node size for that tree | |
| 81 | * before we can set up the B-tree control block. We read it initially | |
| 82 | * as 512 bytes, then re-read it once we know the correct node size. Since | |
| 83 | * we may not have read the entire header node the first time, we can't | |
| 84 | * swap the record offsets, other records, or do most sanity checks. | |
| 85 | */ | |
| 86 | kSwapBTNodeHeaderRecordOnly = 3 | |
| 87 | }; | |
| 88 | ||
| 89 | void hfs_swap_HFSMasterDirectoryBlock (void *buf); | |
| 90 | void hfs_swap_HFSPlusVolumeHeader (void *buf); | |
| 91 | int hfs_swap_BTNode (BlockDescriptor *src, SFCB *fcb, enum HFSBTSwapDirection direction); | |
| 92 | ||
| 93 | #ifdef __cplusplus | |
| 94 | } | |
| 95 | #endif | |
| 96 | ||
| 97 | #endif /* __HFS_FORMAT__ */ |