def test_seek_offset(self):
"""Tests the seek_offset function."""
test_source = unittest.source
if not test_source:
raise unittest.SkipTest("missing source")
vsmbr_partition = pyvsmbr.partition()
vsmbr_partition.open(test_source)
size = vsmbr_partition.get_size()
vsmbr_partition.seek_offset(16, os.SEEK_SET)
offset = vsmbr_partition.get_offset()
self.assertEqual(offset, 16)
vsmbr_partition.seek_offset(16, os.SEEK_CUR)
offset = vsmbr_partition.get_offset()
self.assertEqual(offset, 32)
vsmbr_partition.seek_offset(-16, os.SEEK_CUR)
offset = vsmbr_partition.get_offset()
self.assertEqual(offset, 16)
if size > 16:
vsmbr_partition.seek_offset(-16, os.SEEK_END)
offset = vsmbr_partition.get_offset()
self.assertEqual(offset, size - 16)
vsmbr_partition.seek_offset(16, os.SEEK_END)
offset = vsmbr_partition.get_offset()
self.assertEqual(offset, size + 16)
# TODO: change IOError into ValueError
with self.assertRaises(IOError):
vsmbr_partition.seek_offset(-1, os.SEEK_SET)
# TODO: change IOError into ValueError
with self.assertRaises(IOError):
vsmbr_partition.seek_offset(-32 - size, os.SEEK_CUR)
# TODO: change IOError into ValueError
with self.assertRaises(IOError):
vsmbr_partition.seek_offset(-32 - size, os.SEEK_END)
# TODO: change IOError into ValueError
with self.assertRaises(IOError):
vsmbr_partition.seek_offset(0, -1)
vsmbr_partition.close()
# Test the seek without open.
with self.assertRaises(IOError):
vsmbr_partition.seek_offset(16, os.SEEK_SET)
def test_get_offset(self):
"""Tests the get_offset function."""
test_source = unittest.source
if not test_source:
raise unittest.SkipTest("missing source")
vsmbr_partition = pyvsmbr.partition()
vsmbr_partition.open(test_source)
offset = vsmbr_partition.get_offset()
self.assertIsNotNone(offset)
vsmbr_partition.close()
def test_get_size(self):
"""Tests the get_size function and size property."""
test_source = unittest.source
if not test_source:
raise unittest.SkipTest("missing source")
vsmbr_partition = pyvsmbr.partition()
vsmbr_partition.open(test_source)
size = vsmbr_partition.get_size()
self.assertIsNotNone(size)
self.assertIsNotNone(vsmbr_partition.size)
vsmbr_partition.close()
def test_read_buffer_file_object(self):
"""Tests the read_buffer function on a file-like object."""
test_source = unittest.source
if not test_source:
raise unittest.SkipTest("missing source")
if not os.path.isfile(test_source):
raise unittest.SkipTest("source not a regular file")
vsmbr_partition = pyvsmbr.partition()
with open(test_source, "rb") as file_object:
vsmbr_partition.open_file_object(file_object)
size = vsmbr_partition.get_size()
# Test normal read.
data = vsmbr_partition.read_buffer(size=4096)
self.assertIsNotNone(data)
self.assertEqual(len(data), min(size, 4096))
vsmbr_partition.close()
def test_read_buffer(self):
"""Tests the read_buffer function."""
test_source = unittest.source
if not test_source:
raise unittest.SkipTest("missing source")
vsmbr_partition = pyvsmbr.partition()
vsmbr_partition.open(test_source)
size = vsmbr_partition.get_size()
if size < 4096:
# Test read without maximum size.
vsmbr_partition.seek_offset(0, os.SEEK_SET)
data = vsmbr_partition.read_buffer()
self.assertIsNotNone(data)
self.assertEqual(len(data), size)
# Test read with maximum size.
vsmbr_partition.seek_offset(0, os.SEEK_SET)
data = vsmbr_partition.read_buffer(size=4096)
self.assertIsNotNone(data)
self.assertEqual(len(data), min(size, 4096))
if size > 8:
vsmbr_partition.seek_offset(-8, os.SEEK_END)
# Read buffer on size boundary.
data = vsmbr_partition.read_buffer(size=4096)
self.assertIsNotNone(data)
self.assertEqual(len(data), 8)
# Read buffer beyond size boundary.
data = vsmbr_partition.read_buffer(size=4096)
self.assertIsNotNone(data)
self.assertEqual(len(data), 0)
# Stress test read buffer.
vsmbr_partition.seek_offset(0, os.SEEK_SET)
remaining_size = size
for _ in range(1024):
read_size = int(random.random() * 4096)
data = vsmbr_partition.read_buffer(size=read_size)
self.assertIsNotNone(data)
data_size = len(data)
if read_size > remaining_size:
read_size = remaining_size
self.assertEqual(data_size, read_size)
remaining_size -= data_size
if not remaining_size:
vsmbr_partition.seek_offset(0, os.SEEK_SET)
remaining_size = size
with self.assertRaises(ValueError):
vsmbr_partition.read_buffer(size=-1)
vsmbr_partition.close()
# Test the read without open.
with self.assertRaises(IOError):
vsmbr_partition.read_buffer(size=4096)
def test_read_buffer_at_offset(self):
"""Tests the read_buffer_at_offset function."""
test_source = unittest.source
if not test_source:
raise unittest.SkipTest("missing source")
vsmbr_partition = pyvsmbr.partition()
vsmbr_partition.open(test_source)
size = vsmbr_partition.get_size()
# Test normal read.
data = vsmbr_partition.read_buffer_at_offset(4096, 0)
self.assertIsNotNone(data)
self.assertEqual(len(data), min(size, 4096))
if size > 8:
# Read buffer on size boundary.
data = vsmbr_partition.read_buffer_at_offset(4096, size - 8)
self.assertIsNotNone(data)
self.assertEqual(len(data), 8)
# Read buffer beyond size boundary.
data = vsmbr_partition.read_buffer_at_offset(4096, size + 8)
self.assertIsNotNone(data)
self.assertEqual(len(data), 0)
# Stress test read buffer.
for _ in range(1024):
random_number = random.random()
media_offset = int(random_number * size)
read_size = int(random_number * 4096)
data = vsmbr_partition.read_buffer_at_offset(
read_size, media_offset)
self.assertIsNotNone(data)
remaining_size = size - media_offset
data_size = len(data)
if read_size > remaining_size:
read_size = remaining_size
self.assertEqual(data_size, read_size)
remaining_size -= data_size
if not remaining_size:
vsmbr_partition.seek_offset(0, os.SEEK_SET)
with self.assertRaises(ValueError):
vsmbr_partition.read_buffer_at_offset(-1, 0)
with self.assertRaises(ValueError):
vsmbr_partition.read_buffer_at_offset(4096, -1)
vsmbr_partition.close()
# Test the read without open.
with self.assertRaises(IOError):
vsmbr_partition.read_buffer_at_offset(4096, 0)