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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2006 Tobias Reifenberger
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #include <sys/types.h>
    
    /*
     * Conversion macros for little endian encoded unsigned integers
     * in byte streams to the local unsigned integer format.
     */
    #define UINT16BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1])))
    #define UINT32BYTES(p) ((uint32_t)((p)[0] + (256*(p)[1]) +              \
                (65536*(p)[2]) + (16777216*(p)[3])))
    
    /*
     * All following structures are according to:
     *
     * Microsoft Extensible Firmware Initiative FAT32 File System Specification
     * FAT: General Overview of On-Disk Format
     * Version 1.03, December 6, 2000
     * Microsoft Corporation
     */
    
    /*
     * FAT boot sector and boot parameter block for
     * FAT12 and FAT16 volumes
     */
    typedef struct fat_bsbpb {
            /* common fields */
            uint8_t BS_jmpBoot[3];
            uint8_t BS_OEMName[8];
            uint8_t BPB_BytsPerSec[2];
            uint8_t BPB_SecPerClus;
            uint8_t BPB_RsvdSecCnt[2];
            uint8_t BPB_NumFATs;
            uint8_t BPB_RootEntCnt[2];
            uint8_t BPB_TotSec16[2];
            uint8_t BPB_Media;
            uint8_t BPB_FATSz16[2];
            uint8_t BPB_SecPerTrack[2];
            uint8_t BPB_NumHeads[2];
            uint8_t BPB_HiddSec[4];
            uint8_t BPB_TotSec32[4];
            /* FAT12/FAT16 only fields */
            uint8_t BS_DrvNum;
            uint8_t BS_Reserved1;
            uint8_t BS_BootSig;
            uint8_t BS_VolID[4];
            uint8_t BS_VolLab[11];
            uint8_t BS_FilSysType[8];
    } FAT_BSBPB; /* 62 bytes */
    
    /*
     * FAT boot sector and boot parameter block for
     * FAT32 volumes
     */
    typedef struct fat32_bsbpb {
            /* common fields */
            uint8_t BS_jmpBoot[3];
            uint8_t BS_OEMName[8];
            uint8_t BPB_BytsPerSec[2];
            uint8_t BPB_SecPerClus;
            uint8_t BPB_RsvdSecCnt[2];
            uint8_t BPB_NumFATs;
            uint8_t BPB_RootEntCnt[2];
            uint8_t BPB_TotSec16[2];
            uint8_t BPB_Media;
            uint8_t BPB_FATSz16[2];
            uint8_t BPB_SecPerTrack[2];
            uint8_t BPB_NumHeads[2];
            uint8_t BPB_HiddSec[4];
            uint8_t BPB_TotSec32[4];
            /* FAT32 only fields */
           uint8_t BPB_FATSz32[4];
           uint8_t BPB_ExtFlags[2];
           uint8_t BPB_FSVer[2];
           uint8_t BPB_RootClus[4];
           uint8_t BPB_FSInfo[2];
           uint8_t BPB_BkBootSec[2];
           uint8_t BPB_Reserved[12];
           uint8_t BS_DrvNum;
           uint8_t BS_Reserved1;
           uint8_t BS_BootSig;
           uint8_t BS_VolID[4];
           uint8_t BS_VolLab[11];
           uint8_t BS_FilSysType[8];
   } FAT32_BSBPB; /* 90 bytes */
   
   /*
    * FAT directory entry structure
    */
   #define FAT_DES_ATTR_READ_ONLY  0x01
   #define FAT_DES_ATTR_HIDDEN     0x02
   #define FAT_DES_ATTR_SYSTEM     0x04
   #define FAT_DES_ATTR_VOLUME_ID  0x08
   #define FAT_DES_ATTR_DIRECTORY  0x10
   #define FAT_DES_ATTR_ARCHIVE    0x20
   #define FAT_DES_ATTR_LONG_NAME  (FAT_DES_ATTR_READ_ONLY |               \
                                    FAT_DES_ATTR_HIDDEN |                  \
                                    FAT_DES_ATTR_SYSTEM |                  \
                                    FAT_DES_ATTR_VOLUME_ID)
   
   typedef struct fat_des {
           uint8_t DIR_Name[11];
           uint8_t DIR_Attr;
           uint8_t DIR_NTRes;
           uint8_t DIR_CrtTimeTenth;
           uint8_t DIR_CrtTime[2];
           uint8_t DIR_CrtDate[2];
           uint8_t DIR_LstAccDate[2];
           uint8_t DIR_FstClusHI[2];
           uint8_t DIR_WrtTime[2];
           uint8_t DIR_WrtDate[2];
           uint8_t DIR_FstClusLO[2];
           uint8_t DIR_FileSize[4];
   } FAT_DES;

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