code: public void compressedSkip(long offset) throws IOException {
          ByteStreams.skipFully(in, offset);
          updateInnerMark();
          currentMemberStart = ((CountingInputStream)in).getCount(); 
          currentMemberEnd = -1; 
          startNewMember();
      }
docs: Skip forward the given number of bytes in the compressed stream. Note
  that after any seek/skip the memberNumbers may not reflect a member's
  true ordinal position from the beginning of the stream.
  
  @param offset bytes to skip
  @throws IOException
  @throws EOFException