Top-level directory layout:

Directory	Description
=============	=============================================================
alg		Portable implementations of simple, standard algorithms.
		Organized into sub-directories based on type, i.e. alg/hash
		is hashing algorithms.
common		Non-specific functionality that is of general interest, i.e.
		the logging system, test infrastructure and Buffer class.
config		General-purpose configuration system infrastructure and some
		essential types and classes.
event		The event system and infrastructure to support it, such as
		the various implementations of the poll interface.
io		Interface to IO subsystems, namely file descriptors and
		sockets, as well as abstract classes for such things (e.g.
		Channel, Pipe, Splice.)
net		Networking utility functions and protocols.
programs	Stand-alone programs.
		Organized into sub-directories named by program, i.e.
		programs/wanproxy is WANProxy.
xcodec		The XCodec codec, which performs deduplication, and its
		internal interfaces.
zlib		Wrappers around zlib, providing Pipes that do inflate and
		deflate.

Standard sub-directories:

Directory	Description
=============	=============================================================
test		Unit tests.
example		Example programs which may test functionality in a
		non-automated fashion or merely provide example usage of a
		complex interface.