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procedure Compress(InputFileName, OutputFileName: string);
var InputStream, OutputStream: TFileStream;
  CompressionStream: ZLib.TCompressionStream;
begin
  InputStream:=TFileStream.Create(InputFileName, fmOpenRead);
  try
    OutputStream:=TFileStream.Create(OutputFileName, fmCreate);
    try
      CompressionStream:=TCompressionStream.Create(clMax, OutputStream);
      try
        CompressionStream.CopyFrom(InputStream, InputStream.Size);
      finally
        CompressionStream.Free;
      end;
    finally
      OutputStream.Free;
    end;
  finally
    InputStream.Free;
  end;
end;