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diff --git a/src/libdiskfs/hfs.h b/src/libdiskfs/hfs.h
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+/*
+	Supports HFS Plus and HFSX file systems with or without an HFS
+	wrapper.
+
+	Apple technical note 1150 documents the file system:
+	
+	http://developer.apple.com/technotes/tn/tn1150.html
+	
+	Briefly an hfs file system comprises a volume header, an
+	optional journal, and a set of forks.
+	
+	Most fs metadata resides in forks including a block allocation
+	bitmap, a tree storing extents (q.v.) for forks and bad disk
+	blocks, and a tree storing catalog (file and directory)
+	information.
+
+	An extent comprises a starting block number and block count.
+	The fs maintains a list of k*NEXTENTS extents for each fork.
+	These are used to map fork block numbers to disk block
+	numbers.  A fork's initial extents are in its catalog record
+	or (for fs forks) the volume header.  The rest are in the
+	extents tree.
+
+	Fs trees are layed out (in a fork) as an array of fixed-size
+	nodes.  A node comprises a header, a sorted list of
+	variable-size records, and trailing record offsets.  The
+	records in interior nodes map keys to (child) node numbers.
+	The records in leaf nodes map keys to data.  The nodes at each
+	level in a tree are also sorted via (sibling) node numbers
+	stored in each node header.
+*/
+
+typedef struct Extent Extent;
+typedef struct Fork Fork;
+typedef struct Inode Inode;
+typedef struct Tree Tree;
+typedef struct Node Node;
+typedef struct Treeref Treeref;
+typedef struct Key Key;
+typedef struct Extentkey Extentkey;
+typedef struct Name Name;
+typedef struct Catalogkey Catalogkey;
+typedef struct Hfs Hfs;
+
+enum
+{
+	Hfssig = 0x4244,
+	Hfsplussig = 0x482B,
+	Hfsxsig = 0x4858,
+ 	Hfsplusmagic = (Hfsplussig<<16)|4,
+ 	Hfsxmagic = (Hfsxsig<<16)|5,
+
+	NAMELEN = 255,
+	UTFNAMELEN = NAMELEN*UTFmax,
+	
+	NEXTENTS = 8,
+	
+	Dfork = 0, Rfork = 255,
+	
+	/* fixed cnids */
+	RootpId = 1, RootId, ExtentsId, CatalogId,
+	BadblockId, AllocId, MinuserId = 16,
+
+	/* size of a few structures on disk */
+	Extentlen = 8,		/* Extent */
+	Ndlen = 14,		/* Node */
+	Folderlen = 88, Filelen = 248,		/* Inode */
+
+	/* values in Node.type */
+	LeafNode = -1, IndexNode, HeaderNode, MapNode,
+	
+	/* catalog record types */
+	Folder = 1, File, FolderThread, FileThread,
+
+	/* permissions in Inode.mode */
+	IEXEC = 00100,
+	IWRITE = 0200,
+	IREAD = 0400,
+	ISTXT = 01000,
+	ISGID = 02000,
+	ISUID = 04000,
+
+	/* type in Inode.mode */
+	IFMT = 0170000,
+	IFIFO = 0010000,
+	IFCHR = 0020000,
+	IFDIR = 0040000,
+	IFBLK = 0060000,
+	IFREG = 0100000,
+	IFLNK = 0120000,
+	IFSOCK = 0140000,
+	IFWHT = 0160000,
+};
+
+struct Extent
+{
+	u32int	start;		/* first block in extent */
+	u32int	count;		/* number of blocks in extent */
+};
+
+struct Fork
+{
+	u32int	cnid;		/* catalog node id (in memory only) */
+	int	type;		/* Dfork or Rfork (in memory only) */
+	u64int	size;		/* size in bytes */
+	u32int	nblocks;
+	Extent	extent[NEXTENTS];		/* initial extents */
+};
+
+/*
+ * In-core catalog record for a file or folder.
+ */
+struct Inode
+{
+	u32int	cnid;
+	u32int	mtime;		/* modification */
+	u32int	ctime;		/* attribute modification */
+	u32int	atime;		/* access */
+	u32int	uid;
+	u32int	gid;
+	int	mode;
+	u32int	special;
+	union{
+		u32int	nentries;		/* directories */
+		struct{		/* files */
+			Fork	dfork;
+			/*Fork rfork;*/
+		};
+	};
+};
+
+struct Tree
+{
+	int	nodesize;		/* node size in bytes */
+	u32int	nnodes;		/* number of nodes in tree */
+	u32int	root;		/* node number of the tree's root */
+	int	height;
+	int	maxkeylen;		/* maximum key size in bytes */
+	int	indexkeylen;		/* 0 or length of index node keys */
+	int	sensitive;		/* are key strings case sensitive */
+	Hfs	*fs;
+	Fork	*fork;
+};
+
+struct Node
+{
+	int	type;		/* type of this node */
+	u32int	next;		/* next related node or 0 */
+	int	nrec;		/* number of records in this node */
+};
+
+struct Treeref
+{
+	Tree	*tree;
+	u32int	cnid;		/* tree->fork->cnid, for debugging prints */
+	
+	Block	*block;		/* a node in the tree */
+	u32int	nno;
+	Node	node;
+	
+	int	rno;		/* a record in the node */
+	int	klen;
+	uchar	*key;	
+	int	dlen;
+	uchar	*data;
+};
+
+struct Key
+{
+	int	(*_cmp)(uchar *k, int len, int *order, Key *key);
+	void	*priv;
+};
+
+struct Extentkey
+{
+	u32int	cnid;
+	int	type;
+	u32int	bno;
+};
+
+struct Name
+{
+	int	len;
+	Rune	name[NAMELEN];		/* only len runes on disk */
+};
+
+struct Catalogkey
+{
+	u32int	parent;
+	union{
+		Name	name;
+		uchar	*b;		/* not yet decoded */
+	};
+};
+
+struct Hfs
+{
+	u32int	blocksize;
+	u32int	nblock;
+	u32int	nfree;		/* for debugging */
+	int	hasbadblocks;
+	Fork	alloc;		/* block allocation bitmap */
+	Fork	extentsfork;
+	Fork	catalogfork;
+	Tree	extents;		/* Extentkey -> Extent[NEXTENT] */
+	Tree	catalog;		/* Catalogkey -> Catalogkey + Inode */
+	int	wrapper;		/* HFS wrapper used? */
+	Disk	*disk;
+	Fsys	*fsys;
+};