86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/* ----------------------------------------------------------------------- *
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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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