For encoding and decoding the VCDIFF format, you can use either open-
vcdiff (
http://code.google.com/p/open-vcdiff) or Xdelta (http://
xdelta.org/).
For an example of a client that supports SDCH, please see Chromium
(
http://www.chromium.org/). The modules that implement SDCH are
located in the net/base directory of the Chromium source tree.
Saludos,
lincoln