fs/hfs_mdb.h

   1 /*
   2  *   Creation Date: <2000/09/03 23:04:27 samuel>
   3  *   Time-stamp: <2000/09/04 01:23:55 samuel>
   4  *
   5  *      <hfs_mdb.h>
   6  *
   7  *      HFS Master Directory Block (MDB)
   8  *
   9  *   This program is free software; you can redistribute it and/or
  10  *   modify it under the terms of the GNU General Public License
  11  *   as published by the Free Software Foundation
  12  *
  13  */
  14
  15 #ifndef _H_HFS_MDB
  16 #define _H_HFS_MDB
  17
  18 typedef unsigned char hfs_char_t;
  19 typedef unsigned char hfs_ushort_t[2];
  20 typedef unsigned char hfs_uint_t[4];
  21
  22 #define hfs_get_ushort(addr)    (*((unsigned short*)(addr)))
  23 #define hfs_get_uint(addr)      (*((unsigned int*)(addr)))
  24
  25 /*
  26  * The HFS Master Directory Block (MDB).
  27  *
  28  * Also known as the Volume Information Block (VIB), this structure is
  29  * the HFS equivalent of a superblock.
  30  *
  31  * Reference: _Inside Macintosh: Files_ pages 2-59 through 2-62
  32  *
  33  * modified for HFS Extended
  34  */
  35
  36 typedef struct hfs_mdb {
  37         hfs_ushort_t    drSigWord;      /* Signature word indicating fs type */
  38         hfs_uint_t      drCrDate;       /* fs creation date/time */
  39         hfs_uint_t      drLsMod;        /* fs modification date/time */
  40         hfs_ushort_t    drAtrb;         /* fs attributes */
  41         hfs_ushort_t    drNmFls;        /* number of files in root directory */
  42         hfs_ushort_t    drVBMSt;        /* location (in 512-byte blocks)
  43                                            of the volume bitmap */
  44         hfs_ushort_t    drAllocPtr;     /* location (in allocation blocks)
  45                                            to begin next allocation search */
  46         hfs_ushort_t    drNmAlBlks;     /* number of allocation blocks */
  47         hfs_uint_t      drAlBlkSiz;     /* bytes in an allocation block */
  48         hfs_uint_t      drClpSiz;       /* clumpsize, the number of bytes to
  49                                            allocate when extending a file */
  50         hfs_ushort_t    drAlBlSt;       /* location (in 512-byte blocks)
  51                                            of the first allocation block */
  52         hfs_uint_t      drNxtCNID;      /* CNID to assign to the next
  53                                            file or directory created */
  54         hfs_ushort_t    drFreeBks;      /* number of free allocation blocks */
  55         hfs_char_t      drVN[28];       /* the volume label */
  56         hfs_uint_t      drVolBkUp;      /* fs backup date/time */
  57         hfs_ushort_t    drVSeqNum;      /* backup sequence number */
  58         hfs_uint_t      drWrCnt;        /* fs write count */
  59         hfs_uint_t      drXTClpSiz;     /* clumpsize for the extents B-tree */
  60         hfs_uint_t      drCTClpSiz;     /* clumpsize for the catalog B-tree */
  61         hfs_ushort_t    drNmRtDirs;     /* number of directories in
  62                                            the root directory */
  63         hfs_uint_t      drFilCnt;       /* number of files in the fs */
  64         hfs_uint_t      drDirCnt;       /* number of directories in the fs */
  65         hfs_char_t      drFndrInfo[32]; /* data used by the Finder */
  66         hfs_ushort_t    drEmbedSigWord; /* embedded volume signature */
  67         hfs_uint_t      drEmbedExtent;  /* starting block number (xdrStABN)
  68                                            and number of allocation blocks
  69                                            (xdrNumABlks) occupied by embedded
  70                                            volume */
  71         hfs_uint_t      drXTFlSize;     /* bytes in the extents B-tree */
  72         hfs_char_t      drXTExtRec[12]; /* extents B-tree's first 3 extents */
  73         hfs_uint_t      drCTFlSize;     /* bytes in the catalog B-tree */
  74         hfs_char_t      drCTExtRec[12]; /* catalog B-tree's first 3 extents */
  75 } hfs_mdb_t;
  76
  77 #define HFS_PLUS_SIGNATURE      0x482b          /* 'H+' */
  78 #define HFS_SIGNATURE           0x4244          /* HFS / embedded HFS+ */
  79
  80
  81 typedef struct hfs_plus_mdb
  82 {
  83         ushort  signature;
  84         ushort  version;
  85         uint    attributes;
  86         uint    lastMountedVersion;
  87         uint    reserved;
  88
  89         uint    createDate;
  90         uint    modifyDate;
  91         uint    backupDate;
  92         uint    checkedDate;
  93
  94         uint    fileCount;
  95         uint    folderCount;
  96
  97         uint    blockSize;
  98         uint    totalBlocks;
  99         uint    freeBlocks;
 100
 101         uint    nextAllocation;
 102         uint    rsrcClumpSize;
 103         uint    dataClumpSize;
 104
 105         /* ... there are more fields here ... */
 106 } hfs_plus_mdb_t;
 107
 108
 109 #endif   /* _H_HFS_MDB */