xdelta For Linux

xdelta is a library and application for computing and applying file deltas. xdelta project features VCDIFF encoding and decoding.

Xdelta was designed and implemented by Joshua MacDonald. The delta algorithm is based on the Rsync algorithm, though implementation and interface considerations leave the two programs quite distinct. The Rsync algorithm is due to Andrew Tridgell and Paul Mackerras.

To compile and install Xdelta, read the instructions in the INSTALL file. Once you have done this, you should at least read the first few sections of the documentation. It is available in info format. All documentation is located in the doc/ subdirectory.

-0..9 Set the zlib compression level. Zero indicates no compression. Nine indicates maximum compression.

-h, --help Print a short help message and exit.

-q, --quiet Quiet. Surpresses several warning messages.

-v, --version Print the Xdelta version number and exit.

-V, --verbose Verbose. Prints a bit of extra information.

-n, --noverify No verify. Turns off MD5 checksum verification of the input and output files.

-m=SIZE, --maxmem=SIZE Set an upper bound on the size of an in-memory page cache. For example, --maxmem=32M will use a 32 megabyte page cache.

-s=BLOCK_SIZE Set the block size, unless it was hard coded (20% speed improvement). Should be a power of 2.

-p, --pristine Disable the automatic decompression of gzipped inputs, to prevent unexpected differences in the re-compressed content.

What's New in This Release:

� This release contains bug fixes and performance improvements. � It also features VCDIFF encoding.