usr.sbin/fstyp/msdosfs.h

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