Read up to _length_ bytes from the file storing into _data_.
@param fp BGZF file handler @param data data array to read into @param length size of data to read @return number of bytes actually read; 0 on end-of-file and -1 on error
See Implementation
Read up to _length_ bytes from the file storing into _data_.
@param fp BGZF file handler @param data data array to read into @param length size of data to read @return number of bytes actually read; 0 on end-of-file and -1 on error