create (Tcustomzlibstream)

create (Tdecompressionstream)

destroy (Tcustomzlibstream)

destroy (Tdecompressionstream)

pt 

GetPosition (Tdecompressionstream)

get_compressionrate (Tdecompressionstream)

pt 

progress (Tcustomzlibstream)

read (Tdecompressionstream)

pt 

reset (Tdecompressionstream)

Seek (Tdecompressionstream)