added: functions for using bit stream filter

[codecov-io]

Current coverage is 30.06%

Merging #24 into master will decrease coverage by 0.80%

@@             master        #24   diff @@
==========================================
  Files             4          4          
  Lines          2429       2481    +52   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
- Hits            750        746     -4   
- Misses         1679       1693    +14   
- Partials          0         42    +42   

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[imkira]

Thanks!