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85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/* fat.h - Read/write access to the FAT
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Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
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Copyright (C) 2008-2014 Daniel Baumann <mail@daniel-baumann.ch>
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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, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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THe complete text of the GNU General Public License
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can be found in /usr/share/common-licenses/GPL-3 file.
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*/
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#ifndef _FAT_H
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#define _FAT_H
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void read_fat(DOS_FS * fs);
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/* Loads the FAT of the filesystem described by FS. Initializes the FAT,
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replaces broken FATs and rejects invalid cluster entries. */
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void get_fat(FAT_ENTRY * entry, void *fat, uint32_t cluster, DOS_FS * fs);
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/* Retrieve the FAT entry (next chained cluster) for CLUSTER. */
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void set_fat(DOS_FS * fs, uint32_t cluster, int32_t new);
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/* Changes the value of the CLUSTERth cluster of the FAT of FS to NEW. Special
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values of NEW are -1 (EOF, 0xff8 or 0xfff8) and -2 (bad sector, 0xff7 or
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0xfff7) */
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int bad_cluster(DOS_FS * fs, uint32_t cluster);
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/* Returns a non-zero integer if the CLUSTERth cluster is marked as bad or zero
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otherwise. */
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uint32_t next_cluster(DOS_FS * fs, uint32_t cluster);
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/* Returns the number of the cluster following CLUSTER, or -1 if this is the
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last cluster of the respective cluster chain. CLUSTER must not be a bad
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cluster. */
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off_t cluster_start(DOS_FS * fs, uint32_t cluster);
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/* Returns the byte offset of CLUSTER, relative to the respective device. */
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void set_owner(DOS_FS * fs, uint32_t cluster, DOS_FILE * owner);
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/* Sets the owner pointer of the respective cluster to OWNER. If OWNER was NULL
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before, it can be set to NULL or any non-NULL value. Otherwise, only NULL is
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accepted as the new value. */
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DOS_FILE *get_owner(DOS_FS * fs, uint32_t cluster);
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/* Returns the owner of the repective cluster or NULL if the cluster has no
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owner. */
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void fix_bad(DOS_FS * fs);
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/* Scans the disk for currently unused bad clusters and marks them as bad. */
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void reclaim_free(DOS_FS * fs);
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/* Marks all allocated, but unused clusters as free. */
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void reclaim_file(DOS_FS * fs);
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/* Scans the FAT for chains of allocated, but unused clusters and creates files
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for them in the root directory. Also tries to fix all inconsistencies (e.g.
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loops, shared clusters, etc.) in the process. */
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uint32_t update_free(DOS_FS * fs);
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/* Updates free cluster count in FSINFO sector. */
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#endif
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