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 */
59typedef 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 */
88typedef 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
134typedef 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