Help me compressing .pak files fro crysis Warhead

[EzzEldin16]

Introduction

The command-line syntax is like gzip, with the additional option -s SOURCE.
Like gzip, -d means to decompress. The default mode (-e) is to compress.
For output, -c and -f flags behave likewise (use standard output, force overwrite).
Unlike gzip, xdelta3 defaults to stdout (instead of having an automatic extension).
Without -s SOURCE, xdelta3 behaves like gzip for stdin/stdout purposes.
Compress examples:
xdelta3 -s SOURCE TARGET > OUT xdelta3 -s SOURCE TARGET OUT xdelta3 -s SOURCE < TARGET > OUT Decompress examples:
xdelta3 -d -s SOURCE OUT > TARGET xdelta3 -d -s SOURCE OUT TARGET xdelta3 -d -s SOURCE < OUT > TARGET There are several special command names, such as xdelta3 printdelta and xdelta3 test.
usage: xdelta3 [command/options] [input [output]] special command names: config prints xdelta3 configuration decode decompress the input encode compress the input test run the builtin tests special commands for VCDIFF inputs: printdelta print information about the entire delta printhdr print information about the first window printhdrs print information about all windows standard options: -0 .. -9 compression level -c use stdout -d decompress -e compress -f force overwrite -h show help -q be quiet -v be verbose (max 2) -V show version memory options: -B bytes source window size -W bytes input window size compression options: -s source source file to copy from (if any) -S [djw|fgk] enable/disable secondary compression -N disable small string-matching compression -D disable external decompression (encode/decode) -R disable external recompression (decode) -n disable checksum (encode/decode) -C soft config (encode, undocumented) -A [apphead] disable/provide application header (encode) The -A flag may be used to set application-specific data in the VCDIFF header (you may view with xdelta3 printhdr). By default, the application-specific data includes the source and input filenames, as well as descriptors to help with ExternalCompression. You can disable the application header with -A=.