def __init__(self, buf, mutable=False):
self.buf = buf
self.ptr, self.nbyte, self.block_id = self.buf.open()
self.nbyte_commit = self.nbyte
self.ptr = get_pointer_value(self.ptr)
if self.ptr is not None:
self.data = np.ndarray(
shape=(self.nbyte,),
buffer=_address_as_buffer(self.ptr, self.nbyte),
dtype=np.uint8)
self.data.flags['WRITEABLE'] = mutable
def header(self):
size = self.header_size
if size == 0:
# WAR for hdr_buffer_ptr.contents crashing when size == 0
hdr_array = np.empty(0, dtype=np.uint8)
hdr_array.flags['WRITEABLE'] = False
return hdr_array
hdr_buffer = _address_as_buffer(self._header_ptr, size, readonly=True)
hdr_array = np.frombuffer(hdr_buffer, dtype=np.uint8)
hdr_array.flags['WRITEABLE'] = False
return hdr_array
def header(self):
if self._header is not None:
return self._header
size = self.header_size
if size == 0:
# WAR for hdr_buffer_ptr.contents crashing when size == 0
hdr_array = np.empty(0, dtype=np.uint8)
hdr_array.flags['WRITEABLE'] = False
return json.loads(hdr_array.tobytes())
hdr_buffer = _address_as_buffer(self._header_ptr, size, readonly=True)
hdr_array = np.frombuffer(hdr_buffer, dtype=np.uint8)
hdr_array.flags['WRITEABLE'] = False
self._header = json.loads(hdr_array.tobytes())
return self._header