1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
|
/*
* Copyright (c) 2000, 2005 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* The contents of this file constitute Original Code as defined in and
* are subject to the Apple Public Source License Version 1.1 (the
* "License"). You may not use this file except in compliance with the
* License. Please obtain a copy of the License at
* http://www.apple.com/publicsource and read it before using this file.
*
* This 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 OR NON-INFRINGEMENT. Please see the
* License for the specific language governing rights and limitations
* under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#ifndef __HFS_ENDIAN_H__
#define __HFS_ENDIAN_H__
/*
* hfs_endian.h
*
* This file prototypes endian swapping routines for the HFS/HFS Plus
* volume format.
*/
#include <hfs/hfs_format.h>
#if LINUX
#include <endian.h>
#include <byteswap.h>
#else
#include <architecture/byte_order.h>
#endif
#include "SRuntime.h"
/*********************/
/* BIG ENDIAN Macros */
/*********************/
#define SWAP_BE16(__a) OSSwapBigToHostInt16 (__a)
#define SWAP_BE32(__a) OSSwapBigToHostInt32 (__a)
#define SWAP_BE64(__a) OSSwapBigToHostInt64 (__a)
#if BYTE_ORDER == BIG_ENDIAN
/* HFS is always big endian, no swapping needed */
#define SWAP_HFSMDB(__a)
#define SWAP_HFSPLUSVH(__a)
/************************/
/* LITTLE ENDIAN Macros */
/************************/
#elif BYTE_ORDER == LITTLE_ENDIAN
#define SWAP_HFSMDB(__a) hfs_swap_HFSMasterDirectoryBlock ((__a))
#define SWAP_HFSPLUSVH(__a) hfs_swap_HFSPlusVolumeHeader ((__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
};
void hfs_swap_HFSMasterDirectoryBlock (void *buf);
void hfs_swap_HFSPlusVolumeHeader (void *buf);
int hfs_swap_BTNode (BlockDescriptor *src, SFCB *fcb, enum HFSBTSwapDirection direction);
#ifdef __cplusplus
}
#endif
#endif /* __HFS_FORMAT__ */
|
