def _read_cbf_image(self):
start_tag = binascii.unhexlify("0c1a04d5")
with self.open_file(self._image_file, "rb") as fh:
data = fh.read()
data_offset = data.find(start_tag) + 4
cbf_header = self._parse_cbf_header(data[:data_offset - 4].decode(
"ascii", "ignore"))
if cbf_header["byte_offset"]:
pixel_values = uncompress(
packed=data[data_offset:data_offset + cbf_header["size"]],
fast=cbf_header["fast"],
slow=cbf_header["slow"],
)
elif cbf_header["no_compression"]:
assert len(self.get_detector()) == 1
with self.open_file(self._image_file) as f:
f.read(data_offset)
pixel_values = read_int32(streambuf(f), cbf_header["length"])
pixel_values.reshape(
flex.grid(cbf_header["slow"], cbf_header["fast"]))
else:
raise ValueError(
"Compression of type other than byte_offset or none is not supported (contact authors)"
)
return pixel_values
def test_compress_decompress():
x, y = 10, 10
data = flex.int(x * y, 1)
data[10] = 44369
data[11] = 214
compressed = compress(data)
uncompressed = uncompress(compressed, x, y)
assert list(data) == list(uncompressed)
def _read_cbf_image(self):
start_tag = binascii.unhexlify("0c1a04d5")
with self.open_file(self._image_file, "rb") as fh:
data = fh.read()
data_offset = data.find(start_tag) + 4
cbf_header = self._parse_cbf_header(data[:data_offset - 4].decode(
"ascii", "ignore"))
pixel_values = uncompress(
packed=data[data_offset:data_offset + cbf_header["size"]],
fast=cbf_header["fast"],
slow=cbf_header["slow"],
)
return pixel_values