The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/geom/label/g_label_msdosfs.h

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

Cache object: 572b1f3485f8a9241089f483b3d90351


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