func (dd *dictDecoder) availRead() int {
	return dd.wrPos - dd.rdPos
}

// availWrite reports the available amount of output buffer space.
func (dd *dictDecoder) availWrite() int {
	return len(dd.hist) - dd.wrPos
}

// writeSlice returns a slice of the available buffer to write data to.
//
// This invariant will be kept: len(s) <= availWrite()
func (dd *dictDecoder) writeSlice() []byte {
	return dd.hist[dd.wrPos:]
}

			if cnt == 0 {
				cnt = dd.writeCopy(dist, length)
			}

			length -= cnt
			if dd.availWrite() == 0 {
				got.Write(dd.readFlush())
			}
		}
	}
	var writeString = func(str string) {
		for len(str) > 0 {
			cnt := copy(dd.writeSlice(), str)
			str = str[cnt:]
			dd.writeMark(cnt)
			if dd.availWrite() == 0 {
				got.Write(dd.readFlush())
			}
		}
	}

	writeString(".")
	want.WriteByte('.')