1 /* ----------------------------------------------------------------------- * 2 * 3 * Copyright 2004-2008 H. Peter Anvin - All Rights Reserved 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation, Inc., 53 Temple Place Ste 330, 8 * Boston MA 02111-1307, USA; either version 2 of the License, or 9 * (at your option) any later version; incorporated herein by reference. 10 * 11 * ----------------------------------------------------------------------- */ 12 13 /* 14 * libfat.h 15 * 16 * Headers for the libfat library 17 */ 18 19 #ifndef LIBFAT_H 20 #define LIBFAT_H 21 22 #include <stddef.h> 23 #include <inttypes.h> 24 25 #define LIBFAT_SECTOR_SHIFT 9 26 #define LIBFAT_SECTOR_SIZE 512 27 #define LIBFAT_SECTOR_MASK 511 28 29 typedef uint64_t libfat_sector_t; 30 struct libfat_filesystem; 31 32 struct libfat_direntry { 33 libfat_sector_t sector; 34 int offset; 35 unsigned char entry[32]; 36 }; 37 38 /* 39 * Open the filesystem. The readfunc is the function to read 40 * sectors, in the format: 41 * int readfunc(intptr_t readptr, void *buf, size_t secsize, 42 * libfat_sector_t secno) 43 * 44 * ... where readptr is a private argument. 45 * 46 * A return value of != secsize is treated as error. 47 */ 48 struct libfat_filesystem 49 *libfat_open(int (*readfunc) (intptr_t, void *, size_t, libfat_sector_t), 50 intptr_t readptr); 51 52 void libfat_close(struct libfat_filesystem *); 53 54 /* 55 * Convert a cluster number (or 0 for the root directory) to a 56 * sector number. Return -1 on failure. 57 */ 58 libfat_sector_t libfat_clustertosector(const struct libfat_filesystem *fs, 59 int32_t cluster); 60 61 /* 62 * Get the next sector of either the root directory or a FAT chain. 63 * Returns 0 on end of file and -1 on error. 64 */ 65 libfat_sector_t libfat_nextsector(struct libfat_filesystem *fs, 66 libfat_sector_t s); 67 68 /* 69 * Flush all cached sectors for this filesystem. 70 */ 71 void libfat_flush(struct libfat_filesystem *fs); 72 73 /* 74 * Get a pointer to a specific sector. 75 */ 76 void *libfat_get_sector(struct libfat_filesystem *fs, libfat_sector_t n); 77 78 /* 79 * Search a FAT directory for a particular pre-mangled filename. 80 * Copies the directory entry into direntry and returns 0 if found. 81 */ 82 int32_t libfat_searchdir(struct libfat_filesystem *fs, int32_t dirclust, 83 const void *name, struct libfat_direntry *direntry); 84 85 #endif /* LIBFAT_H */ 86
