csvorbis.VorbisFile.bisect_forward_serialno C# (CSharp) Method

        int bisect_forward_serialno(long begin, long searched, long end, int currentno, int m)
        {
            long endsearched=end;
            long next=end;
            Page page=new Page();
            int ret;

            while(searched<endsearched)
            {
                long bisect;
                if(endsearched-searched<CHUNKSIZE)
                {
                    bisect=searched;
                }
                else
                {
                    bisect=(searched+endsearched)/2;
                }

                seek_helper(bisect);
                ret=get_next_page(page, -1);
                if(ret==OV_EREAD) return OV_EREAD;
                if(ret<0 || page.serialno()!=currentno)
                {
                    endsearched=bisect;
                    if(ret>=0)next=ret;
                }
                else
                {
                    searched=ret+page.header_len+page.body_len;
                }
            }
            seek_helper(next);
            ret=get_next_page(page, -1);
            if(ret==OV_EREAD) return OV_EREAD;

            if(searched>=end || ret==-1)
            {
                links=m+1;
                offsets=new long[m+2];
                offsets[m+1]=searched;
            }
            else
            {
                ret=bisect_forward_serialno(next, offset, end, page.serialno(), m+1);
                if(ret==OV_EREAD)return OV_EREAD;
            }
            offsets[m]=begin;
            return 0;
        }