"Xdelta is a file delta computation and application software with a library for efficient processing." (20 words)
To compile and install xdelta, refer to the INSTALL file in order to properly follow instructions. It's highly recommended that you take the time to go through the first few sections of the documentation available in the info format. All of the software's documentation can be found in the doc/ subdirectory.
Once installed, the options available include the ability to set the zlib compression level between -0..9, with zero indicating no compression and nine being the maximum compression level. You can also print a short help message and exit, suppress multiple warning messages, print the xdelta version number and exit, and even set an upper bound on the size of a page cache. Other available options include setting block size and disabling automatic decompression of gzipped inputs.
The latest release features bug fixes and performance improvements along with VCDIFF encoding. Overall, xdelta is a reliable software program for computing and applying file deltas.
Version 3.0e: N/A