diff --git a/dosfstools/src/fat.h b/dosfstools/src/fat.h
new file mode 100644
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--- /dev/null
+++ b/dosfstools/src/fat.h
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+/* fat.h - Read/write access to the FAT
+
+   Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
+
+   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 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+   On Debian systems, the complete text of the GNU General Public License
+   can be found in /usr/share/common-licenses/GPL-3 file.
+*/
+
+#ifndef _FAT_H
+#define _FAT_H
+
+void read_fat(DOS_FS * fs);
+
+/* Loads the FAT of the file system described by FS. Initializes the FAT,
+   replaces broken FATs and rejects invalid cluster entries. */
+
+void get_fat(FAT_ENTRY * entry, void *fat, unsigned long cluster, DOS_FS * fs);
+
+/* Retrieve the FAT entry (next chained cluster) for CLUSTER. */
+
+void set_fat(DOS_FS * fs, unsigned long cluster, unsigned long new);
+
+/* Changes the value of the CLUSTERth cluster of the FAT of FS to NEW. Special
+   values of NEW are -1 (EOF, 0xff8 or 0xfff8) and -2 (bad sector, 0xff7 or
+   0xfff7) */
+
+int bad_cluster(DOS_FS * fs, unsigned long cluster);
+
+/* Returns a non-zero integer if the CLUSTERth cluster is marked as bad or zero
+   otherwise. */
+
+unsigned long next_cluster(DOS_FS * fs, unsigned long cluster);
+
+/* Returns the number of the cluster following CLUSTER, or -1 if this is the
+   last cluster of the respective cluster chain. CLUSTER must not be a bad
+   cluster. */
+
+loff_t cluster_start(DOS_FS * fs, unsigned long cluster);
+
+/* Returns the byte offset of CLUSTER, relative to the respective device. */
+
+void set_owner(DOS_FS * fs, unsigned long cluster, DOS_FILE * owner);
+
+/* Sets the owner pointer of the respective cluster to OWNER. If OWNER was NULL
+   before, it can be set to NULL or any non-NULL value. Otherwise, only NULL is
+   accepted as the new value. */
+
+DOS_FILE *get_owner(DOS_FS * fs, unsigned long cluster);
+
+/* Returns the owner of the repective cluster or NULL if the cluster has no
+   owner. */
+
+void fix_bad(DOS_FS * fs);
+
+/* Scans the disk for currently unused bad clusters and marks them as bad. */
+
+void reclaim_free(DOS_FS * fs);
+
+/* Marks all allocated, but unused clusters as free. */
+
+void reclaim_file(DOS_FS * fs);
+
+/* Scans the FAT for chains of allocated, but unused clusters and creates files
+   for them in the root directory. Also tries to fix all inconsistencies (e.g.
+   loops, shared clusters, etc.) in the process. */
+
+unsigned long update_free(DOS_FS * fs);
+
+/* Updates free cluster count in FSINFO sector. */
+
+#endif