Location
The Google Snappy library is included in binary form with the Essential Tools Module, installed in the following locations:
On Windows:
installdir\3rdparty\snappy-ver\windows\arch\bin
installdir\3rdparty\snappy-ver\windows\arch\include
installdir\3rdparty\snappy-ver\windows\arch\lib
On UNIX:
installdir/3rdparty/snappy-ver/os/arch/bin
installdir/3rdparty/snappy-ver/os/arch/include
installdir/3rdparty/snappy-ver/os/arch/lib
installdir/3rdparty/snappy-ver/os/arch/sbin
 
You can use these libraries or use your own compressor class, whose only requirement is that it provide the same API as RWSnappyCompressor.