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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__ */ |