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      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 (at) 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