The Barry library has the following exception hierarchy:

- std::exception
	- std::logic_error
	- std::runtime_error
		- Barry::Error
			- Usb::Error
				- Usb::Timeout
			- Barry::BadPassword
			- Barry::BadData
			- Barry::BadSize
			- Barry::ErrnoError
				- Barry::ConfigFileError
			- Barry::BadPackedFormat
			- Barry::BadPacket
			- Barry::ConvertError
			- Barry::BackupError
			- Barry::RestoreError
			- Barry::JDWP::Error
			- Barry::JDWP::Timeout
			- Barry::PinNotFound

Usb::Error
	All specific USB error exceptions will be derived from
	this class.  Where possible, this class also stores the
	specific return code from the libusb API, to allow
	fine grained error handling.

Barry::Error
	All specific Barry error exceptions will be derived from
	this class.  This can be thrown from anywhere inside Barry.

std::bad_alloc
	There is also the remote possibility that there will be memory
	exceptions from a call to 'new'.  In that case, std::bad_alloc
	will be thrown by the standard C++ libraries.  Barry does not
	catch these errors.

std::logic_error
	Assert-like errors will cause std::logic_error to be thrown.
	Barry does sometimes throw these, but they should be be
	exceedingly rare.

All of the above exceptions (from std, Barry, and Usb namespaces)
are derived from std::exception, so they can all be caught in one
statement for the efficient and lazy. :-)