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85 lines
2.3 KiB
85 lines
2.3 KiB
/* ----------------------------------------------------------------------- * |
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* |
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* Copyright 2004-2008 H. Peter Anvin - All Rights Reserved |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, Inc., 53 Temple Place Ste 330, |
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* Boston MA 02111-1307, USA; either version 2 of the License, or |
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* (at your option) any later version; incorporated herein by reference. |
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* |
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* ----------------------------------------------------------------------- */ |
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/* |
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* libfat.h |
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* |
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* Headers for the libfat library |
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*/ |
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#ifndef LIBFAT_H |
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#define LIBFAT_H |
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#include <stddef.h> |
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#include <inttypes.h> |
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#define LIBFAT_SECTOR_SHIFT 9 |
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#define LIBFAT_SECTOR_SIZE 512 |
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#define LIBFAT_SECTOR_MASK 511 |
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typedef uint64_t libfat_sector_t; |
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struct libfat_filesystem; |
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struct libfat_direntry { |
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libfat_sector_t sector; |
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int offset; |
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unsigned char entry[32]; |
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}; |
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/* |
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* Open the filesystem. The readfunc is the function to read |
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* sectors, in the format: |
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* int readfunc(intptr_t readptr, void *buf, size_t secsize, |
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* libfat_sector_t secno) |
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* |
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* ... where readptr is a private argument. |
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* |
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* A return value of != secsize is treated as error. |
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*/ |
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struct libfat_filesystem |
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*libfat_open(int (*readfunc) (intptr_t, void *, size_t, libfat_sector_t), |
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intptr_t readptr); |
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void libfat_close(struct libfat_filesystem *); |
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/* |
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* Convert a cluster number (or 0 for the root directory) to a |
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* sector number. Return -1 on failure. |
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*/ |
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libfat_sector_t libfat_clustertosector(const struct libfat_filesystem *fs, |
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int32_t cluster); |
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/* |
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* Get the next sector of either the root directory or a FAT chain. |
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* Returns 0 on end of file and -1 on error. |
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*/ |
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libfat_sector_t libfat_nextsector(struct libfat_filesystem *fs, |
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libfat_sector_t s); |
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/* |
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* Flush all cached sectors for this filesystem. |
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*/ |
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void libfat_flush(struct libfat_filesystem *fs); |
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/* |
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* Get a pointer to a specific sector. |
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*/ |
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void *libfat_get_sector(struct libfat_filesystem *fs, libfat_sector_t n); |
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/* |
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* Search a FAT directory for a particular pre-mangled filename. |
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* Copies the directory entry into direntry and returns 0 if found. |
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*/ |
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int32_t libfat_searchdir(struct libfat_filesystem *fs, int32_t dirclust, |
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const void *name, struct libfat_direntry *direntry); |
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#endif /* LIBFAT_H */
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