Import revision 9131ba637f003fb5894e3f6343a27d6322205f18 from FreeBSD.

Change-Id: I8ee418314ea407ca679bcd1bed85bd4cff435c22

1 files changed, 141 insertions, 0 deletions

diff --git a/dosfs.h b/dosfs.h
new file mode 100644
index 0000000..3d84ea0
--- /dev/null
+++ b/dosfs.h
@@ -0,0 +1,141 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
+ * Copyright (c) 1995 Martin Husemann
+ * Some structure declaration borrowed from Paul Popelka
+ * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *	$NetBSD: dosfs.h,v 1.4 1997/01/03 14:32:48 ws Exp $
+ * $FreeBSD$
+ */
+
+#ifndef DOSFS_H
+#define DOSFS_H
+
+/* support 4Kn disk reads */
+#define DOSBOOTBLOCKSIZE_REAL 512
+#define DOSBOOTBLOCKSIZE 4096
+
+typedef	u_int32_t	cl_t;	/* type holding a cluster number */
+
+/*
+ * architecture independent description of all the info stored in a
+ * FAT boot block.
+ */
+struct bootblock {
+	u_int	bpbBytesPerSec;		/* bytes per sector */
+	u_int	bpbSecPerClust;		/* sectors per cluster */
+	u_int	bpbResSectors;		/* number of reserved sectors */
+	u_int	bpbFATs;		/* number of bpbFATs */
+	u_int	bpbRootDirEnts;		/* number of root directory entries */
+	u_int32_t bpbSectors;		/* total number of sectors */
+	u_int	bpbMedia;		/* media descriptor */
+	u_int	bpbFATsmall;		/* number of sectors per FAT */
+	u_int	SecPerTrack;		/* sectors per track */
+	u_int	bpbHeads;		/* number of heads */
+	u_int32_t bpbHiddenSecs;	/* # of hidden sectors */
+	u_int32_t bpbHugeSectors;	/* # of sectors if bpbbpbSectors == 0 */
+	cl_t	bpbRootClust;		/* Start of Root Directory */
+	u_int	bpbFSInfo;		/* FSInfo sector */
+	u_int	bpbBackup;		/* Backup of Bootblocks */
+	cl_t	FSFree;			/* Number of free clusters acc. FSInfo */
+	cl_t	FSNext;			/* Next free cluster acc. FSInfo */
+
+	/* and some more calculated values */
+	u_int	flags;			/* some flags: */
+#define	FAT32		1		/* this is a FAT32 file system */
+					/*
+					 * Maybe, we should separate out
+					 * various parts of FAT32?	XXX
+					 */
+	int	ValidFat;		/* valid fat if FAT32 non-mirrored */
+	cl_t	ClustMask;		/* mask for entries in FAT */
+	cl_t	NumClusters;		/* # of entries in a FAT */
+	u_int32_t NumSectors;		/* how many sectors are there */
+	u_int32_t FATsecs;		/* how many sectors are in FAT */
+	u_int32_t NumFatEntries;	/* how many entries really are there */
+	u_int	ClusterOffset;		/* at what sector would sector 0 start */
+	u_int	ClusterSize;		/* Cluster size in bytes */
+
+	/* Now some statistics: */
+	u_int	NumFiles;		/* # of plain files */
+	u_int	NumFree;		/* # of free clusters */
+	u_int	NumBad;			/* # of bad clusters */
+};
+
+struct fatEntry {
+	cl_t	next;			/* pointer to next cluster */
+	cl_t	head;			/* pointer to start of chain */
+	u_int32_t length;		/* number of clusters on chain */
+	int	flags;			/* see below */
+};
+
+#define	CLUST_FREE	0		/* 0 means cluster is free */
+#define	CLUST_FIRST	2		/* 2 is the minimum valid cluster number */
+#define	CLUST_RSRVD	0xfffffff6	/* start of reserved clusters */
+#define	CLUST_BAD	0xfffffff7	/* a cluster with a defect */
+#define	CLUST_EOFS	0xfffffff8	/* start of EOF indicators */
+#define	CLUST_EOF	0xffffffff	/* standard value for last cluster */
+
+/*
+ * Masks for cluster values
+ */
+#define	CLUST12_MASK	0xfff
+#define	CLUST16_MASK	0xffff
+#define	CLUST32_MASK	0xfffffff
+
+#define	FAT_USED	1		/* This fat chain is used in a file */
+
+#define	DOSLONGNAMELEN	256		/* long name maximal length */
+#define LRFIRST		0x40		/* first long name record */
+#define	LRNOMASK	0x1f		/* mask to extract long record
+					 * sequence number */
+
+/*
+ * Architecture independent description of a directory entry
+ */
+struct dosDirEntry {
+	struct dosDirEntry
+		*parent,		/* previous tree level */
+		*next,			/* next brother */
+		*child;			/* if this is a directory */
+	char name[8+1+3+1];		/* alias name first part */
+	char lname[DOSLONGNAMELEN];	/* real name */
+	uint flags;			/* attributes */
+	cl_t head;			/* cluster no */
+	u_int32_t size;			/* filesize in bytes */
+	uint fsckflags;			/* flags during fsck */
+};
+/* Flags in fsckflags: */
+#define	DIREMPTY	1
+#define	DIREMPWARN	2
+
+/*
+ *  TODO-list of unread directories
+ */
+struct dirTodoNode {
+	struct dosDirEntry *dir;
+	struct dirTodoNode *next;
+};
+
+#endif