xref: /netbsd-src/usr.sbin/fstyp/msdosfs.h (revision b985414b8f8688f3bfa6718c583260b26b0bf1d1)
1 /*	$NetBSD: msdosfs.h,v 1.1 2018/01/09 03:31:15 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 2017 The NetBSD Foundation, Inc.
5  * Copyright (c) 2016 The DragonFly Project
6  * Copyright (c) 2006 Tobias Reifenberger
7  * All rights reserved.
8  *
9  * This code is derived from software contributed to The NetBSD Foundation
10  * by Tomohiro Kusumi <kusumi.tomohiro@gmail.com>.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  * $FreeBSD$
34  */
35 
36 #include <sys/types.h>
37 
38 /*
39  * Conversion macros for little endian encoded unsigned integers
40  * in byte streams to the local unsigned integer format.
41  */
42 #define UINT16BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1])))
43 #define UINT32BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1]) +		\
44 	    (65536*(p)[2]) + (16777216*(p)[3])))
45 
46 /*
47  * All following structures are according to:
48  *
49  * Microsoft Extensible Firmware Initiative FAT32 File System Specification
50  * FAT: General Overview of On-Disk Format
51  * Version 1.03, December 6, 2000
52  * Microsoft Corporation
53  */
54 
55 /*
56  * FAT boot sector and boot parameter block for
57  * FAT12 and FAT16 volumes
58  */
59 typedef struct fat_bsbpb {
60 	/* common fields */
61 	uint8_t BS_jmpBoot[3];
62 	uint8_t BS_OEMName[8];
63 	uint8_t BPB_BytsPerSec[2];
64 	uint8_t BPB_SecPerClus;
65 	uint8_t BPB_RsvdSecCnt[2];
66 	uint8_t BPB_NumFATs;
67 	uint8_t BPB_RootEntCnt[2];
68 	uint8_t BPB_TotSec16[2];
69 	uint8_t BPB_Media;
70 	uint8_t BPB_FATSz16[2];
71 	uint8_t BPB_SecPerTrack[2];
72 	uint8_t BPB_NumHeads[2];
73 	uint8_t BPB_HiddSec[4];
74 	uint8_t BPB_TotSec32[4];
75 	/* FAT12/FAT16 only fields */
76 	uint8_t BS_DrvNum;
77 	uint8_t BS_Reserved1;
78 	uint8_t BS_BootSig;
79 	uint8_t BS_VolID[4];
80 	uint8_t BS_VolLab[11];
81 	uint8_t BS_FilSysType[8];
82 } FAT_BSBPB; /* 62 bytes */
83 
84 /*
85  * FAT boot sector and boot parameter block for
86  * FAT32 volumes
87  */
88 typedef struct fat32_bsbpb {
89 	/* common fields */
90 	uint8_t BS_jmpBoot[3];
91 	uint8_t BS_OEMName[8];
92 	uint8_t BPB_BytsPerSec[2];
93 	uint8_t BPB_SecPerClus;
94 	uint8_t BPB_RsvdSecCnt[2];
95 	uint8_t BPB_NumFATs;
96 	uint8_t BPB_RootEntCnt[2];
97 	uint8_t BPB_TotSec16[2];
98 	uint8_t BPB_Media;
99 	uint8_t BPB_FATSz16[2];
100 	uint8_t BPB_SecPerTrack[2];
101 	uint8_t BPB_NumHeads[2];
102 	uint8_t BPB_HiddSec[4];
103 	uint8_t BPB_TotSec32[4];
104 	/* FAT32 only fields */
105 	uint8_t BPB_FATSz32[4];
106 	uint8_t BPB_ExtFlags[2];
107 	uint8_t BPB_FSVer[2];
108 	uint8_t BPB_RootClus[4];
109 	uint8_t BPB_FSInfo[2];
110 	uint8_t BPB_BkBootSec[2];
111 	uint8_t BPB_Reserved[12];
112 	uint8_t BS_DrvNum;
113 	uint8_t BS_Reserved1;
114 	uint8_t BS_BootSig;
115 	uint8_t BS_VolID[4];
116 	uint8_t BS_VolLab[11];
117 	uint8_t BS_FilSysType[8];
118 } FAT32_BSBPB; /* 90 bytes */
119 
120 /*
121  * FAT directory entry structure
122  */
123 #define	FAT_DES_ATTR_READ_ONLY	0x01
124 #define	FAT_DES_ATTR_HIDDEN	0x02
125 #define	FAT_DES_ATTR_SYSTEM	0x04
126 #define	FAT_DES_ATTR_VOLUME_ID	0x08
127 #define	FAT_DES_ATTR_DIRECTORY	0x10
128 #define	FAT_DES_ATTR_ARCHIVE	0x20
129 #define	FAT_DES_ATTR_LONG_NAME	(FAT_DES_ATTR_READ_ONLY |		\
130 				 FAT_DES_ATTR_HIDDEN |			\
131 				 FAT_DES_ATTR_SYSTEM |			\
132 				 FAT_DES_ATTR_VOLUME_ID)
133 
134 typedef struct fat_des {
135 	uint8_t DIR_Name[11];
136 	uint8_t DIR_Attr;
137 	uint8_t DIR_NTRes;
138 	uint8_t DIR_CrtTimeTenth;
139 	uint8_t DIR_CrtTime[2];
140 	uint8_t DIR_CrtDate[2];
141 	uint8_t DIR_LstAccDate[2];
142 	uint8_t DIR_FstClusHI[2];
143 	uint8_t DIR_WrtTime[2];
144 	uint8_t DIR_WrtDate[2];
145 	uint8_t DIR_FstClusLO[2];
146 	uint8_t DIR_FileSize[4];
147 } FAT_DES;
148