if (from instanceof RubyBignum) {
RubyBignum big128 = RubyBignum.newBignum(runtime, 128);
while (from instanceof RubyBignum) {
RubyBignum bignum = (RubyBignum)from;
RubyArray ary = (RubyArray)bignum.divmod(runtime.getCurrentContext(), big128);
buf.append((byte)(RubyNumeric.fix2int(ary.at(RubyFixnum.one(runtime))) | 0x80) & 0xff);
from = ary.at(RubyFixnum.zero(runtime));
}
}