code: def solve_buffer(self, addr, nbytes, constrain=False):
          
          buffer = self.cpu.read_bytes(addr, nbytes)
          result = []
          with self._constraints as temp_cs:
              cs_to_use = self.constraints if constrain else temp_cs
              for c in buffer:
                  result.append(self._solver.get_value(cs_to_use, c))
                  cs_to_use.add(c == result[-1])
          return result
docs: Reads `nbytes` of symbolic data from a buffer in memory at `addr` and attempts to
          concretize it
  
          :param int address: Address of buffer to concretize
          :param int nbytes: Size of buffer to concretize
          :param bool constrain: If True, constrain the buffer to the concretized value
          :return: Concrete contents of buffer
          :rtype: list[int]