GNU Smalltalk Library Reference: ZLib.RawDeflateStream class-instance creation

compressingTo: aStream: Answer a stream that receives data via #nextPut: and compresses it onto aStream.
compressingTo: aStream level: level: Answer a stream that receives data via #nextPut: and compresses it onto aStream with the given compression level.
on: aStream: Answer a stream that compresses the data in aStream with the default compression level.
on: aStream level: compressionLevel: Answer a stream that compresses the data in aStream with the given compression level.