def from_stream_fixture(self, request, _App0Marker__init_):
bytes_ = b'\x00\x10JFIF\x00\x01\x01\x01\x00\x2A\x00\x18'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
marker_code, offset, length = JPEG_MARKER_CODE.APP0, 0, 16
density_units, x_density, y_density = 1, 42, 24
return (stream_reader, marker_code, offset, _App0Marker__init_, length,
density_units, x_density, y_density)
def from_offset_fixture(self):
bytes_ = b'\x00\x00\x00\x2A\x00\x00\x00\x18\x01'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset, horz_px_per_unit, vert_px_per_unit, units_specifier = (0, 42,
24, 1)
return (stream_rdr, offset, horz_px_per_unit, vert_px_per_unit,
units_specifier)
def iter_fixture(self, _IfdEntryFactory_, ifd_entry_, ifd_entry_2_):
stream_rdr = StreamReader(BytesIO(b'\x00\x02'), BIG_ENDIAN)
offsets = [2, 14]
ifd_parser = _IfdParser(stream_rdr, offset=0)
expected_entries = [ifd_entry_, ifd_entry_2_]
return (ifd_parser, _IfdEntryFactory_, stream_rdr, offsets,
expected_entries)
def from_stream_fixture(self, request, _SofMarker__init_):
bytes_ = b'\x00\x11\x00\x00\x2A\x00\x18'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
marker_code, offset, length = JPEG_MARKER_CODE.SOF0, 0, 17
px_width, px_height = 24, 42
return (stream_reader, marker_code, offset, _SofMarker__init_, length,
px_width, px_height)
def next_fixture(self, request):
start, marker_code, segment_offset = request.param
bytes_ = b'\xFF\xD8\xFF\xE0\x00\x01\xFF\x00\xFF\xFF\xFF\xD9'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
marker_finder = _MarkerFinder(stream_reader)
expected_code_and_offset = (marker_code, segment_offset)
return marker_finder, start, expected_code_and_offset
def from_stream_fixture(self, request, _App1Marker__init_,
_tiff_from_exif_segment_):
bytes_ = b'\x00\x42Exif\x00\x00'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
marker_code, offset, length = JPEG_MARKER_CODE.APP1, 0, 66
horz_dpi, vert_dpi = 42, 24
return (stream_reader, marker_code, offset, _App1Marker__init_, length,
_tiff_from_exif_segment_, horz_dpi, vert_dpi)
def iter_offsets_fixture(self):
bytes_ = b'-filler-\x00\x00\x00\x00IHDRxxxx\x00\x00\x00\x00IEND'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
chunk_parser = _ChunkParser(stream_rdr)
expected_chunk_offsets = [
(PNG_CHUNK_TYPE.IHDR, 16),
(PNG_CHUNK_TYPE.IEND, 28),
]
return chunk_parser, expected_chunk_offsets
def from_stream_fixture(
self, _parse_value_, _IfdEntry__init_, value_):
bytes_ = b'\x00\x01\x66\x66\x00\x00\x00\x02\x00\x00\x00\x03'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset, tag_code, value_count, value_offset = 0, 1, 2, 3
return (
stream_rdr, offset, _parse_value_, value_count, value_offset,
_IfdEntry__init_, tag_code, value_
)
def it_can_construct_from_non_Exif_APP1_segment(self, _App1Marker__init_):
bytes_ = b'\x00\x42Foobar'
marker_code, offset, length = JPEG_MARKER_CODE.APP1, 0, 66
stream = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
app1_marker = _App1Marker.from_stream(stream, marker_code, offset)
_App1Marker__init_.assert_called_once_with(ANY, marker_code, offset,
length, 72, 72)
assert isinstance(app1_marker, _App1Marker)
def it_can_construct_from_a_stream_and_offset(self, request,
_SofMarker__init_):
bytes_ = b'\x00\x11\x00\x00\x2A\x00\x18'
marker_code, offset, length = JPEG_MARKER_CODE.SOF0, 0, 17
px_width, px_height = 24, 42
stream = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
sof_marker = _SofMarker.from_stream(stream, marker_code, offset)
_SofMarker__init_.assert_called_once_with(ANY, marker_code, offset,
length, px_width, px_height)
assert isinstance(sof_marker, _SofMarker)
def it_can_construct_from_a_stream_and_offset(self, _App0Marker__init_):
bytes_ = b'\x00\x10JFIF\x00\x01\x01\x01\x00\x2A\x00\x18'
marker_code, offset, length = JPEG_MARKER_CODE.APP0, 0, 16
density_units, x_density, y_density = 1, 42, 24
stream = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
app0_marker = _App0Marker.from_stream(stream, marker_code, offset)
_App0Marker__init_.assert_called_once_with(ANY, marker_code, offset,
length, density_units,
x_density, y_density)
assert isinstance(app0_marker, _App0Marker)
def it_can_construct_from_a_stream_and_offset(self, _parse_value_,
_IfdEntry__init_, value_):
bytes_ = b"\x00\x01\x66\x66\x00\x00\x00\x02\x00\x00\x00\x03"
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset, tag_code, value_count, value_offset = 0, 1, 2, 3
_parse_value_.return_value = value_
ifd_entry = _IfdEntry.from_stream(stream_rdr, offset)
_parse_value_.assert_called_once_with(stream_rdr, offset, value_count,
value_offset)
_IfdEntry__init_.assert_called_once_with(ANY, tag_code, value_)
assert isinstance(ifd_entry, _IfdEntry)
def it_can_construct_from_a_stream_and_offset(self, _App1Marker__init_,
_tiff_from_exif_segment_):
bytes_ = b'\x00\x42Exif\x00\x00'
marker_code, offset, length = JPEG_MARKER_CODE.APP1, 0, 66
horz_dpi, vert_dpi = 42, 24
stream = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
app1_marker = _App1Marker.from_stream(stream, marker_code, offset)
_tiff_from_exif_segment_.assert_called_once_with(
stream, offset, length)
_App1Marker__init_.assert_called_once_with(ANY, marker_code, offset,
length, horz_dpi, vert_dpi)
assert isinstance(app1_marker, _App1Marker)
def fixture(self, request, ifd_entry_, _IfdEntry_, _AsciiIfdEntry_,
_ShortIfdEntry_, _LongIfdEntry_, _RationalIfdEntry_):
bytes_, entry_type = request.param
entry_cls_ = {
'BYTE': _IfdEntry_,
'ASCII': _AsciiIfdEntry_,
'SHORT': _ShortIfdEntry_,
'LONG': _LongIfdEntry_,
'RATIONAL': _RationalIfdEntry_,
'CUSTOM': _IfdEntry_,
}[entry_type]
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset = 0
return stream_rdr, offset, entry_cls_, ifd_entry_
def fixture(
self,
request,
ifd_entry_,
_IfdEntry_,
_AsciiIfdEntry_,
_ShortIfdEntry_,
_LongIfdEntry_,
_RationalIfdEntry_,
):
bytes_, entry_type = request.param
entry_cls_ = {
"BYTE": _IfdEntry_,
"ASCII": _AsciiIfdEntry_,
"SHORT": _ShortIfdEntry_,
"LONG": _LongIfdEntry_,
"RATIONAL": _RationalIfdEntry_,
"CUSTOM": _IfdEntry_,
}[entry_type]
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset = 0
return stream_rdr, offset, entry_cls_, ifd_entry_
def read_long_fixture(self, request):
byte_order, bytes_, offset, expected_int = request.param
stream = BytesIO(bytes_)
stream_rdr = StreamReader(stream, byte_order)
return stream_rdr, offset, expected_int
def non_Exif_fixture(self, request, _App1Marker__init_):
bytes_ = b'\x00\x42Foobar'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
marker_code, offset, length = JPEG_MARKER_CODE.APP1, 0, 66
return stream_reader, marker_code, offset, _App1Marker__init_, length
def it_can_parse_a_short_int_IFD_entry(self):
bytes_ = b"foobaroo\x00\x2A"
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
val = _ShortIfdEntry._parse_value(stream_rdr, 0, 1, None)
assert val == 42
def from_offset_fixture(self):
bytes_ = b'\x00\x00\x00\x2A\x00\x00\x00\x18'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset, px_width, px_height = 0, 42, 24
return stream_rdr, offset, px_width, px_height
def get_tiff_fixture(self, request, BytesIO_, substream_, Tiff_, tiff_):
bytes_ = b'xfillerxMM\x00*\x00\x00\x00\x42'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
offset, segment_length, segment_bytes = 0, 16, bytes_[8:]
return (stream_reader, offset, segment_length, BytesIO_, segment_bytes,
substream_, Tiff_, tiff_)
def read_str_fixture(self):
stream = BytesIO(b'\x01\x02foobar\x03\x04')
stream_rdr = StreamReader(stream, BIG_ENDIAN)
expected_string = 'foobar'
return stream_rdr, expected_string
def from_stream_fixture(self, request, _Marker__init_):
marker_code, offset, length = request.param
bytes_ = b'\xFF\xD8\xFF\xE0\x00\x10'
stream_reader = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
return stream_reader, marker_code, offset, _Marker__init_, length
def it_can_parse_a_rational_IFD_entry(self):
bytes_ = b'\x00\x00\x00\x2A\x00\x00\x00\x54'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
val = _RationalIfdEntry._parse_value(stream_rdr, None, 1, 0)
assert val == 0.5
def it_can_parse_a_long_int_IFD_entry(self):
bytes_ = b'foobaroo\x00\x00\x00\x2A'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
val = _LongIfdEntry._parse_value(stream_rdr, 0, 1, None)
assert val == 42
def it_can_parse_an_ascii_string_IFD_entry(self):
bytes_ = b'foobar\x00'
stream_rdr = StreamReader(BytesIO(bytes_), BIG_ENDIAN)
val = _AsciiIfdEntry._parse_value(stream_rdr, None, 7, 0)
assert val == 'foobar'