code: def ctypes2buffer(cptr, length):
      """Convert ctypes pointer to buffer type.
  
      Parameters
      ----------
      cptr : ctypes.POINTER(ctypes.c_char)
          Pointer to the raw memory region.
      length : int
          The length of the buffer.
  
      Returns
      -------
      buffer : bytearray
          The raw byte memory buffer.
      """
      if not isinstance(cptr, ctypes.POINTER(ctypes.c_char)):
          raise TypeError("expected char pointer")
      res = bytearray(length)
      rptr = (ctypes.c_char * length).from_buffer(res)
      if not ctypes.memmove(rptr, cptr, length):
          raise RuntimeError("memmove failed")
      return res
  
imports: import re
  import atexit
  import ctypes
  import os
  import sys
  import inspect
  import platform
  import numpy
  from .None import libinfo
label_desc: Use image node_id 15 for calling a global function with example usage: ctypes2buffer(cptr, length) and returns: res