binary stream after tokenizer and huffman

Which procedure/function or structure returns finally formed binary stream?
I see lib/tokenize.c and lib/encode.c. But it is too hard to understand novice.
Theora algorithm differ in coding with JPEG: http://www.pcs-ip.eu/index.php/main/edu/8

Which function/structure returns stream like this:
100000100011001101101101111101011111111010110011010