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  1. /*
  2.  * Copyright (c) 2008 Jakub Jermar
  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.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - 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.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup fs
  30.  * @{
  31.  */
  32.  
  33. #ifndef FAT_FAT_H_
  34. #define FAT_FAT_H_
  35.  
  36. #include <ipc/ipc.h>
  37. #include <libfs.h>
  38. #include <atomic.h>
  39. #include <sys/types.h>
  40. #include <bool.h>
  41. #include "../../vfs/vfs.h"
  42.  
  43. #define dprintf(...)    printf(__VA_ARGS__)
  44.  
  45. typedef struct {
  46.     uint8_t     ji[3];      /**< Jump instruction. */
  47.     uint8_t     oem_name[8];
  48.     /* BIOS Parameter Block */
  49.     uint16_t    bps;        /**< Bytes per sector. */
  50.     uint8_t     spc;        /**< Sectors per cluster. */
  51.     uint16_t    rscnt;      /**< Reserved sector count. */
  52.     uint8_t     fatcnt;     /**< Number of FATs. */
  53.     uint16_t    root_ent_max;   /**< Maximum number of root directory
  54.                          entries. */
  55.     uint16_t    totsec16;   /**< Total sectors. 16-bit version. */
  56.     uint8_t     mdesc;      /**< Media descriptor. */
  57.     uint16_t    sec_per_fat;    /**< Sectors per FAT12/FAT16. */
  58.     uint16_t    sec_per_track;  /**< Sectors per track. */
  59.     uint16_t    headcnt;    /**< Number of heads. */
  60.     uint32_t    hidden_sec; /**< Hidden sectors. */
  61.     uint32_t    totseci32;  /**< Total sectors. 32-bit version. */
  62.  
  63.     union {
  64.         struct {
  65.             /* FAT12/FAT16 only: Extended BIOS Parameter Block */
  66.             /** Physical drive number. */
  67.             uint8_t     pdn;
  68.             uint8_t     reserved;
  69.             /** Extended boot signature. */
  70.             uint8_t     ebs;
  71.             /** Serial number. */
  72.             uint32_t    id;
  73.             /** Volume label. */
  74.             uint8_t     label[11];
  75.             /** FAT type. */
  76.             uint8_t     type[8];
  77.             /** Boot code. */
  78.             uint8_t     boot_code[448];
  79.             /** Boot sector signature. */
  80.             uint16_t    signature;
  81.         } __attribute__ ((packed));
  82.         struct {
  83.             /* FAT32 only */
  84.             /** Sectors per FAT. */
  85.             uint32_t    sectors_per_fat;
  86.             /** FAT flags. */
  87.             uint16_t    flags;
  88.             /** Version. */
  89.             uint16_t    version;
  90.             /** Cluster number of root directory. */
  91.             uint32_t    root_cluster;
  92.             /** Sector number of file system information sector. */
  93.             uint16_t    fsinfo_sec;
  94.             /** Sector number of boot sector copy. */
  95.             uint16_t    bscopy_sec;
  96.             uint8_t     reserved1[12];
  97.             /** Physical drive number. */
  98.             uint8_t     pdn;
  99.             uint8_t     reserved2;
  100.             /** Extended boot signature. */
  101.             uint8_t     ebs;
  102.             /** Serial number. */
  103.             uint32_t    id;
  104.             /** Volume label. */
  105.             uint8_t     label[11];
  106.             /** FAT type. */
  107.             uint8_t     type[8];
  108.             /** Boot code. */
  109.             uint8_t     boot_code[420];
  110.             /** Signature. */
  111.             uint16_t    signature;
  112.         } __attribute__ ((packed));
  113.     };
  114. } __attribute__ ((packed)) fat_bs_t;
  115.  
  116. typedef struct {
  117.     uint8_t     name[8];
  118.     uint8_t     ext[3];
  119.     uint8_t     attr;
  120.     uint8_t     reserved;
  121.     uint8_t     ctime_fine;
  122.     uint16_t    ctime;
  123.     uint16_t    cdate;
  124.     uint16_t    adate;
  125.     union {
  126.         uint16_t    eaidx;      /* FAT12/FAT16 */
  127.         uint16_t    firstc_hi;  /* FAT32 */
  128.     };
  129.     uint16_t    mtime;
  130.     uint16_t    mdate;
  131.     union {
  132.         uint16_t    firstc;     /* FAT12/FAT16 */
  133.         uint16_t    firstc_lo;  /* FAT32 */
  134.     };
  135.     uint32_t    size;
  136. } __attribute__ ((packed)) fat_dentry_t;
  137.  
  138. typedef enum {
  139.     FAT_DIRECTORY,
  140.     FAT_FILE
  141. } fat_node_type_t;
  142.  
  143. /** FAT in-core node. */
  144. typedef struct {
  145.     fat_node_type_t     type;
  146.     /** VFS index is the node's first allocated cluster. */
  147.     fs_index_t      index;
  148.     dev_handle_t        dev_handle;
  149.     /** FAT in-core node hash table link. */
  150.     link_t          fin_link;
  151.     size_t          size;
  152.     unsigned        lnkcnt;
  153. } fat_node_t;
  154.  
  155. extern fs_reg_t fat_reg;
  156.  
  157. extern void fat_lookup(ipc_callid_t, ipc_call_t *);
  158.  
  159. #endif
  160.  
  161. /**
  162.  * @}
  163.  */
  164.