def test_tell(self):
with io.BytesIO() as dst:
with EncodedFile(dst, mode='wb') as fp:
bytes_written = fp.write(b'abcde')
self.assertEqual(fp.tell(), bytes_written)
dst.seek(0) # Reset
with EncodedFile(dst) as fp:
fp.read(3)
self.assertEqual(fp.tell(), 3)
def test_readinto(self):
with io.BytesIO() as dst:
with EncodedFile(dst, mode='wb') as fp:
fp.write(b'abcde')
dst.seek(0) # Reset
with EncodedFile(dst) as fp:
a = array.array('b', b'x' * 10) # Fill with junk
n = fp.readinto(a)
try:
# Python 3
self.assertEqual(b'abcde', a.tobytes()[:n])
except AttributeError:
self.assertEqual(b'abcde', a.tostring()[:n])
def test_readline(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
lines = TEXT.splitlines()
# Could also use zip
for i, line in enumerate(iter(fp.readline, '')):
self.assertEqual(line, lines[i] + '\n')
def test_with_large_files(self):
test_sizes = [1000, 10000, 100000]
for size in test_sizes:
contents = random_string(size)
with EncodedFile(TEST_FILENAME, mode='wb') as fp:
fp.write(contents)
with EncodedFile(TEST_FILENAME) as fp:
read_str = fp.read()
if read_str != contents:
msg = ('Decoded and original file contents '
'do not match for size: {}')
self.fail(msg.format(size))
def test_seeking_forward_from_current(self):
contents = TEXT
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
self.assertEqual(fp.read(100), contents[:100])
fp.seek(50, io.SEEK_CUR) # Move 50 forwards
self.assertEqual(fp.read(100), contents[150:250])
def test_seeking_from_end_beyond_beginning(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
# Go to end to get size
size = fp.seek(0, io.SEEK_END)
# Go to beginning
self.assertNotRaises(fp.seek, -size, io.SEEK_END)
# One before beginning
self.assertRaises(IOError, fp.seek, -size - 1, io.SEEK_END)
def test_round_trip(self):
write_str = b'Testing\nAnd Stuff'
self.fp.write(write_str)
self.fp.close()
self.fp = EncodedFile(TEST_FILENAME)
self.assertEqual(self.fp.read(), write_str)
def test_remaining_data_flushed_on_close(self):
with io.BytesIO() as dst:
fp = EncodedFile(dst, mode='wb')
fp.write(TEXT)
# Not flusshed
self.assertEqual(len(dst.getvalue()), 0)
# Flush
fp.close()
self.assertTrue(len(dst.getvalue()) > 0)
def test_writelines(self):
with io.BytesIO(TEXT) as fp:
lines = fp.readlines()
with io.BytesIO() as dst:
with EncodedFile(dst, mode='wb') as fp:
fp.writelines(lines)
self.assertEqual(dst.getvalue(), COMPRESSED)
def test_cannot_write_in_read_mode(self):
# Write some junk data
self.fp.write(b'abcde')
self.fp.close()
self.fp = EncodedFile(TEST_FILENAME)
self.assertTrue(self.fp.readable())
self.assertFalse(self.fp.writable())
self.assertRaises(IOError, self.fp.write, b'abcde')
def test_operations_on_closed_file(self):
self.fp.close()
self.assertRaises(ValueError, self.fp.write, b'abcde')
self.assertRaises(ValueError, self.fp.seek, 0)
self.fp = EncodedFile(TEST_FILENAME, 'rb')
self.fp.close()
self.assertRaises(ValueError, self.fp.read)
self.assertRaises(ValueError, self.fp.seek, 0)
def test_buffered_large_files(self):
test_sizes = [1000, 10000, 100000]
for size in test_sizes:
contents = random_string(size)
with EncodedFile(TEST_FILENAME, mode='wb') as fp:
fp.write(contents)
with EncodedFile(TEST_FILENAME) as fp:
# Read small buffer sizes
read_func = functools.partial(fp.read, 512)
read_str = ''.join([s for s in iter(read_func, '')])
if read_str != contents:
msg = ('Decoded and original file contents '
'do not match for size: {}')
self.fail(msg.format(size))
def test_read_buffered(self):
READ_SIZE = 128
offset = 0
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
read_buf = functools.partial(fp.read, READ_SIZE)
for i, contents in enumerate(iter(read_buf, '')):
offset = READ_SIZE * i
self.assertEqual(contents, TEXT[offset:offset + READ_SIZE])
def test_with_file_object(self):
plain_file = open(TEST_FILENAME, 'wb')
with EncodedFile(plain_file, mode='wb') as encoded_file:
encoded_file.write(TEXT)
self.assertTrue(encoded_file.closed)
# Shouldn't close the file, as it doesn't own it
self.assertFalse(plain_file.closed)
plain_file.close()
with open(TEST_FILENAME, 'rb') as fp:
self.assertTrue(len(fp.read()) > 0)
def test_write_buffered(self):
BUFFER_SIZE = 16
# BytesIO makes it easy to buffer
text_buf = io.BytesIO(TEXT.encode('utf8'))
with io.BytesIO() as dst:
with EncodedFile(dst, mode='wb') as fp:
while True:
chunk = text_buf.read(BUFFER_SIZE)
if not chunk:
break
fp.write(chunk)
self.assertEqual(dst.getvalue(), COMPRESSED)
def test_different_compress_params(self):
# List of a tuple containing (window_sz2, lookahead_sz2)
encode_params = [
(8, 3),
(11, 6),
(4, 3),
(15, 9),
]
encoded = []
for (window_sz2, lookahead_sz2) in encode_params:
kwargs = {'window_sz2': window_sz2, 'lookahead_sz2': lookahead_sz2}
with io.BytesIO() as dst:
with EncodedFile(dst, 'wb', **kwargs) as fp:
fp.write(TEXT)
encoded.append(dst.getvalue())
# Ensure that all have different values
self.assertEqual(len(encoded), len(set(encoded)))
def test_read_one_char(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
for c in TEXT:
self.assertEqual(fp.read(1), c)
def setUp(self):
self.fp = EncodedFile(TEST_FILENAME, 'wb')
def test_seeking_backwards(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
contents = fp.read(100)
fp.seek(0)
self.assertEqual(fp.read(100), contents)
def test_invalid_modes(self):
data = io.BytesIO()
for mode in ['a+', 'w+', 'ab', 'r+', 'U', 'x', 'xb']:
with self.assertRaisesRegexp(ValueError, '^Invalid mode: .*$'):
EncodedFile(data, mode=mode)
def test_seeking_backwards_from_current(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
contents = fp.read()
fp.seek(-100, io.SEEK_CUR)
self.assertEqual(fp.read(), contents[-100:])
def test_seeking_beyond_beginning_from_current(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
self.assertRaises(IOError, fp.seek, -100, io.SEEK_CUR)
def test_readlines(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
lines = fp.readlines()
self.assertEqual(''.join(lines), TEXT)
def test_seeking_from_end(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
self.assertEqual(fp.read(100), TEXT[:100])
seeked_pos = fp.seek(-100, io.SEEK_END)
self.assertEqual(seeked_pos, len(TEXT) - 100)
self.assertEqual(fp.read(100), TEXT[-100:])
def test_readline_iterator(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
lines = TEXT.splitlines()
for file_line, original_line in zip(fp, lines):
self.assertEqual(file_line, original_line + '\n')
def test_peek(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
pdata = fp.peek()
self.assertNotEqual(len(pdata), 0)
self.assertTrue(TEXT.startswith(pdata))
self.assertEqual(fp.read(), TEXT)
def test_read1_0(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
self.assertEqual(fp.read1(0), b'')
def test_read1(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
blocks = [buf for buf in iter(fp.read1, '')]
self.assertEqual(b''.join(blocks), TEXT)
self.assertEqual(fp.read1(), b'')
def test_context_manager(self):
with EncodedFile(TEST_FILENAME, mode='wb') as fp:
fp.write(b'Testing\n')
fp.write(b'One, two...')
self.assertTrue(fp.closed)
def test_read_whole_file(self):
with EncodedFile(io.BytesIO(COMPRESSED)) as fp:
self.assertEqual(fp.read(), TEXT)