GitLab

bitwise.c:177:
  if(bits)
    w(b,(unsigned long)(ptr[bytes]),bits);    

The above line assumes that the last (n%8) bits of the input buffer are always in
 the least most significant bits of the last byte.
However, this means one cannot copy the bits from another oggpack_buffer written
 to with oggpackB_write(), as it stores them in the most significant bits of the
 last byte.

I.e., oggpackB_write(&opb1,oggpackB_get_buffer(&opb2),oggpackB_bits(&opb2))
fails in general.