def test_get_root_dir_entries_fat16(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb') as img_stream:
fatfs = fat_16.FAT16(img_stream)
counter = 0
for entry in fatfs.get_root_dir_entries():
assert entry.get_name() == self.expected_entries[counter]
counter += 1
def test_follow_cluster_fat16(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb') as img_stream:
fatfs = fat_16.FAT16(img_stream)
result = fatfs.follow_cluster(4)
assert result == [4, 5, 6, 7]
with pytest.raises(Exception):
result = fatfs.follow_cluster(50)
def test_parse_predata_fat16(self, testfs_fat_stable1):
""" Test if parsing the predata region for FAT16 works """
with open(testfs_fat_stable1[1], 'rb') as img_stream:
fatfs = fat_16.FAT16(img_stream)
assert fatfs.pre.sector_size == 512
assert fatfs.pre.sectors_per_cluster == 4
assert fatfs.pre.reserved_sector_count == 4
assert fatfs.pre.fat_count == 2
assert fatfs.pre.rootdir_entry_count == 512
assert fatfs.pre.sectors_per_fat == 52
def test_get_cluster_value_fat16(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb') as img_stream:
fatfs = fat_16.FAT16(img_stream)
assert fatfs.get_cluster_value(0) == 'last_cluster'
assert fatfs.get_cluster_value(1) == 'last_cluster'
assert fatfs.get_cluster_value(2) == 'free_cluster'
assert fatfs.get_cluster_value(3) == 'last_cluster'
assert fatfs.get_cluster_value(4) == 5
assert fatfs.get_cluster_value(5) == 6
assert fatfs.get_cluster_value(6) == 7
assert fatfs.get_cluster_value(7) == 'last_cluster'
def test_write_exceptions(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb+') as img_stream:
fatfs = fat_16.FAT16(img_stream)
with pytest.raises(AttributeError):
fatfs.write_fat_entry(-1, 15)
with pytest.raises(AttributeError):
fatfs.write_fat_entry(fatfs.entries_per_fat, 15)
with pytest.raises(AssertionError):
fatfs.write_fat_entry(2, 0)
with pytest.raises(AssertionError):
fatfs.write_fat_entry(2, 0xfff7)
def test_cluster_to_stream_fat16(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb') as img_stream:
fatfs = fat_16.FAT16(img_stream)
with io.BytesIO() as mem:
# here we take the last cluster of 'long_file.txt'
# as it contains chars and empty space
fatfs.cluster_to_stream(7, mem)
mem.seek(0)
result = mem.read()
expected = b'1' * 1856 + b'\n' + b'\x00' * 190 + b'\x00'
assert result == expected
def test_write_fat_entry_fat16(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb+') as img_stream:
fatfs = fat_16.FAT16(img_stream)
actual_value = fatfs.get_cluster_value(4)
value_above = fatfs.get_cluster_value(3)
value_below = fatfs.get_cluster_value(5)
expected = 19
fatfs.write_fat_entry(4, expected)
result = fatfs.get_cluster_value(4)
assert result == expected
# Test that we didn't damage cluster enties beside our own
value_above_now = fatfs.get_cluster_value(3)
value_below_now = fatfs.get_cluster_value(5)
assert value_above_now == value_above
assert value_below_now == value_below
fatfs.write_fat_entry(4, actual_value)
def test_get_free_cluster_fat16(self, testfs_fat_stable1):
with open(testfs_fat_stable1[1], 'rb') as img_stream:
fatfs = fat_16.FAT16(img_stream)
result = fatfs.get_free_cluster()
assert result == 17
