Subversion Repositories freemyipod

/***************************************************************************

 *             __________               __   ___.

 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___

 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /

 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <

 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \

 *                     \/            \/     \/    \/            \/

 * $Id$

 *

 * Copyright (C) 2002 by Linus Nielsen Feltzing

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY

 * KIND, either express or implied.

 *

 ****************************************************************************/

#ifndef FAT_H

#define FAT_H

#include <stdbool.h>

#include "mv.h" /* for volume definitions */

#include "config.h"

/* This value can be overwritten by a target in config-[target].h, but

   that behaviour is still experimental */

#ifndef SECTOR_SIZE

#define SECTOR_SIZE 512

#endif

/* Number of bytes reserved for a file name (including the trailing \0).

   Since names are stored in the entry as UTF-8, we won't be able to

   store all names allowed by FAT. In FAT, a name can have max 255

   characters (not bytes!). Since the UTF-8 encoding of a char may take

   up to 4 bytes, there will be names that we won't be able to store

   completely. For such names, the short DOS name is used. */

#define FAT_FILENAME_BYTES 256

struct fat_direntry

{

    unsigned char name[FAT_FILENAME_BYTES]; /* UTF-8 encoded name plus \0 */

    unsigned short attr;            /* Attributes */

    unsigned char crttimetenth;     /* Millisecond creation

                                       time stamp (0-199) */

    unsigned short crttime;         /* Creation time */

    unsigned short crtdate;         /* Creation date */

    unsigned short lstaccdate;      /* Last access date */

    unsigned short wrttime;         /* Last write time */

    unsigned short wrtdate;         /* Last write date */

    unsigned long filesize;          /* File size in bytes */

    long firstcluster;               /* fstclusterhi<<16 + fstcluslo */

};

#define FAT_ATTR_READ_ONLY   0x01

#define FAT_ATTR_HIDDEN      0x02

#define FAT_ATTR_SYSTEM      0x04

#define FAT_ATTR_VOLUME_ID   0x08

#define FAT_ATTR_DIRECTORY   0x10

#define FAT_ATTR_ARCHIVE     0x20

#define FAT_ATTR_VOLUME      0x40 /* this is a volume, not a real directory */

struct fat_file

{

    long firstcluster;    /* first cluster in file */

    long lastcluster;     /* cluster of last access */

    long lastsector;      /* sector of last access */

    long clusternum;      /* current clusternum */

    long sectornum;       /* sector number in this cluster */

    unsigned int direntry;   /* short dir entry index from start of dir */

    unsigned int direntries; /* number of dir entries used by this file */

    long dircluster;      /* first cluster of dir */

    bool eof;

#ifdef HAVE_MULTIVOLUME

    int volume;          /* file resides on which volume */

#endif

};

struct fat_dir

{

    unsigned int entry;

    unsigned int entrycount;

    long sector;

    struct fat_file file;

    unsigned char sectorcache[SECTOR_SIZE];

    /* There are 2-bytes per characters. We don't want to bother too much, as LFN entries are

     * at much 255 characters longs, that's at most 20 LFN entries. Each entry hold at most

     * 13 characters, that a total of 260 characters. So we keep a buffer of that size.

     * Keep coherent with fat.c code. */

    unsigned char longname[260 * 2];

};

#ifdef HAVE_HOTSWAP

extern void fat_lock(void);

extern void fat_unlock(void);

#endif

extern void fat_init(void);

extern int fat_mount(IF_MV2(int volume,) IF_MD2(int drive,) long startsector);

extern int fat_unmount(int volume, bool flush);

extern void fat_size(IF_MV2(int volume,) /* public for info */

                     unsigned long* size,

                     unsigned long* free);

extern void fat_recalc_free(IF_MV_NONVOID(int volume)); /* public for debug info screen */

extern int fat_create_dir(const char* name,

                          struct fat_dir* newdir,

                          struct fat_dir* dir);

extern int fat_open(IF_MV2(int volume,)

                    long cluster,

                    struct fat_file* ent,

                    const struct fat_dir* dir);

extern int fat_create_file(const char* name,

                           struct fat_file* ent,

                           struct fat_dir* dir);

extern long fat_readwrite(struct fat_file *ent, long sectorcount, 

                         void* buf, bool write );

extern int fat_closewrite(struct fat_file *ent, long size, int attr);

extern int fat_seek(struct fat_file *ent, unsigned long sector );

extern int fat_remove(struct fat_file *ent);

extern int fat_truncate(const struct fat_file *ent);

extern int fat_rename(struct fat_file* file, 

                      struct fat_dir* dir,

                      const unsigned char* newname,

                      long size, int attr);

extern int fat_opendir(IF_MV2(int volume,)

                       struct fat_dir *ent, unsigned long startcluster,

                       const struct fat_dir *parent_dir);

extern int fat_getnext(struct fat_dir *ent, struct fat_direntry *entry);

extern unsigned int fat_get_cluster_size(IF_MV_NONVOID(int volume)); /* public for debug info screen */

extern bool fat_ismounted(int volume);

#endif