firmware/export/fat.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2002 by Linus Nielsen Feltzing
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #ifndef FAT_H
  23 #define FAT_H
  24
  25 #include <stdbool.h>
  26 #include "mv.h" /* for volume definitions */
  27 #include "config.h"
  28
  29 #define SECTOR_SIZE 512
  30
  31 /* Number of bytes reserved for a file name (including the trailing \0).
  32    Since names are stored in the entry as UTF-8, we won't be able to
  33    store all names allowed by FAT. In FAT, a name can have max 255
  34    characters (not bytes!). Since the UTF-8 encoding of a char may take
  35    up to 4 bytes, there will be names that we won't be able to store
  36    completely. For such names, the short DOS name is used. */
  37 #define FAT_FILENAME_BYTES 256
  38
  39 struct fat_direntry
  40 {
  41     unsigned char name[FAT_FILENAME_BYTES]; /* UTF-8 encoded name plus \0 */
  42     unsigned short attr;            /* Attributes */
  43     unsigned char crttimetenth;     /* Millisecond creation
  44                                        time stamp (0-199) */
  45     unsigned short crttime;         /* Creation time */
  46     unsigned short crtdate;         /* Creation date */
  47     unsigned short lstaccdate;      /* Last access date */
  48     unsigned short wrttime;         /* Last write time */
  49     unsigned short wrtdate;         /* Last write date */
  50     unsigned long filesize;          /* File size in bytes */
  51     long firstcluster;               /* fstclusterhi<<16 + fstcluslo */
  52 };
  53
  54 #define FAT_ATTR_READ_ONLY   0x01
  55 #define FAT_ATTR_HIDDEN      0x02
  56 #define FAT_ATTR_SYSTEM      0x04
  57 #define FAT_ATTR_VOLUME_ID   0x08
  58 #define FAT_ATTR_DIRECTORY   0x10
  59 #define FAT_ATTR_ARCHIVE     0x20
  60 #define FAT_ATTR_VOLUME      0x40 /* this is a volume, not a real directory */
  61
  62 struct fat_file
  63 {
  64     long firstcluster;    /* first cluster in file */
  65     long lastcluster;     /* cluster of last access */
  66     long lastsector;      /* sector of last access */
  67     long clusternum;      /* current clusternum */
  68     long sectornum;       /* sector number in this cluster */
  69     unsigned int direntry;   /* short dir entry index from start of dir */
  70     unsigned int direntries; /* number of dir entries used by this file */
  71     long dircluster;      /* first cluster of dir */
  72     bool eof;
  73 #ifdef HAVE_MULTIVOLUME
  74     int volume;          /* file resides on which volume */
  75 #endif
  76 };
  77
  78 struct fat_dir
  79 {
  80     unsigned int entry;
  81     unsigned int entrycount;
  82     long sector;
  83     struct fat_file file;
  84     unsigned char sectorcache[3][SECTOR_SIZE];
  85 };
  86
  87 #ifdef HAVE_HOTSWAP
  88 extern void fat_lock(void);
  89 extern void fat_unlock(void);
  90 #endif
  91
  92 extern void fat_init(void);
  93 extern int fat_mount(IF_MV2(int volume,) IF_MV2(int drive,) long startsector);
  94 extern int fat_unmount(int volume, bool flush);
  95 extern void fat_size(IF_MV2(int volume,) /* public for info */
  96                      unsigned long* size,
  97                      unsigned long* free);
  98 extern void fat_recalc_free(IF_MV_NONVOID(int volume)); /* public for debug info screen */
  99 extern int fat_create_dir(const char* name,
 100                           struct fat_dir* newdir,
 101                           struct fat_dir* dir);
 102 extern int fat_open(IF_MV2(int volume,)
 103                     long cluster,
 104                     struct fat_file* ent,
 105                     const struct fat_dir* dir);
 106 extern int fat_create_file(const char* name,
 107                            struct fat_file* ent,
 108                            struct fat_dir* dir);
 109 extern long fat_readwrite(struct fat_file *ent, long sectorcount,
 110                          void* buf, bool write );
 111 extern int fat_closewrite(struct fat_file *ent, long size, int attr);
 112 extern int fat_seek(struct fat_file *ent, unsigned long sector );
 113 extern int fat_remove(struct fat_file *ent);
 114 extern int fat_truncate(const struct fat_file *ent);
 115 extern int fat_rename(struct fat_file* file,
 116                       struct fat_dir* dir,
 117                       const unsigned char* newname,
 118                       long size, int attr);
 119
 120 extern int fat_opendir(IF_MV2(int volume,)
 121                        struct fat_dir *ent, unsigned long currdir,
 122                        const struct fat_dir *parent_dir);
 123 extern int fat_getnext(struct fat_dir *ent, struct fat_direntry *entry);
 124 extern unsigned int fat_get_cluster_size(IF_MV_NONVOID(int volume)); /* public for debug info screen */
 125 extern bool fat_ismounted(int volume);
 126
 127 #endif