ZLib.ZlibStream class-accessing - GNU Smalltalk Library Reference

bufferSize: Answer the size of the output buffers that are passed to zlib. Each zlib stream uses a buffer of this size.
bufferSize: anInteger: Set the size of the output buffers that are passed to zlib. Each zlib stream uses a buffer of this size.
defaultCompressionLevel: Return the default compression level used by deflating streams.
defaultCompressionLevel: anInteger: Set the default compression level used by deflating streams. It should be a number between 1 and 9.