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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
"""Test script for the gzip module.
"""
import unittest
from test import test_support
import os
import io
import struct
gzip = test_support.import_module('gzip')
data1 = """ int length=DEFAULTALLOC, err = Z_OK;
PyObject *RetVal;
int flushmode = Z_FINISH;
unsigned long start_total_out;
"""
data2 = """/* zlibmodule.c -- gzip-compatible data compression */
/* See http://www.gzip.org/zlib/
/* See http://www.winimage.com/zLibDll for Windows */
"""
class TestGzip(unittest.TestCase):
filename = test_support.TESTFN
def setUp(self):
test_support.unlink(self.filename)
def tearDown(self):
test_support.unlink(self.filename)
def write_and_read_back(self, data, mode='b'):
b_data = memoryview(data).tobytes()
with gzip.GzipFile(self.filename, 'w'+mode) as f:
l = f.write(data)
self.assertEqual(l, len(b_data))
with gzip.GzipFile(self.filename, 'r'+mode) as f:
self.assertEqual(f.read(), b_data)
@test_support.requires_unicode
def test_unicode_filename(self):
unicode_filename = test_support.TESTFN_UNICODE
try:
unicode_filename.encode(test_support.TESTFN_ENCODING)
except (UnicodeError, TypeError):
self.skipTest("Requires unicode filenames support")
self.filename = unicode_filename
with gzip.GzipFile(unicode_filename, "wb") as f:
f.write(data1 * 50)
with gzip.GzipFile(unicode_filename, "rb") as f:
self.assertEqual(f.read(), data1 * 50)
# Sanity check that we are actually operating on the right file.
with open(unicode_filename, 'rb') as fobj, \
gzip.GzipFile(fileobj=fobj, mode="rb") as f:
self.assertEqual(f.read(), data1 * 50)
def test_write(self):
with gzip.GzipFile(self.filename, 'wb') as f:
f.write(data1 * 50)
# Try flush and fileno.
f.flush()
f.fileno()
if hasattr(os, 'fsync'):
os.fsync(f.fileno())
f.close()
# Test multiple close() calls.
f.close()
# The following test_write_xy methods test that write accepts
# the corresponding bytes-like object type as input
# and that the data written equals bytes(xy) in all cases.
def test_write_memoryview(self):
self.write_and_read_back(memoryview(data1 * 50))
def test_write_incompatible_type(self):
# Test that non-bytes-like types raise TypeError.
# Issue #21560: attempts to write incompatible types
# should not affect the state of the fileobject
with gzip.GzipFile(self.filename, 'wb') as f:
with self.assertRaises(UnicodeEncodeError):
f.write(u'\xff')
with self.assertRaises(TypeError):
f.write([1])
f.write(data1)
with gzip.GzipFile(self.filename, 'rb') as f:
self.assertEqual(f.read(), data1)
def test_read(self):
self.test_write()
# Try reading.
with gzip.GzipFile(self.filename, 'r') as f:
d = f.read()
self.assertEqual(d, data1*50)
def test_read_universal_newlines(self):
# Issue #5148: Reading breaks when mode contains 'U'.
self.test_write()
with gzip.GzipFile(self.filename, 'rU') as f:
d = f.read()
self.assertEqual(d, data1*50)
def test_io_on_closed_object(self):
# Test that I/O operations on closed GzipFile objects raise a
# ValueError, just like the corresponding functions on file objects.
# Write to a file, open it for reading, then close it.
self.test_write()
f = gzip.GzipFile(self.filename, 'r')
f.close()
with self.assertRaises(ValueError):
f.read(1)
with self.assertRaises(ValueError):
f.seek(0)
with self.assertRaises(ValueError):
f.tell()
# Open the file for writing, then close it.
f = gzip.GzipFile(self.filename, 'w')
f.close()
with self.assertRaises(ValueError):
f.write('')
with self.assertRaises(ValueError):
f.flush()
def test_append(self):
self.test_write()
# Append to the previous file
with gzip.GzipFile(self.filename, 'ab') as f:
f.write(data2 * 15)
with gzip.GzipFile(self.filename, 'rb') as f:
d = f.read()
self.assertEqual(d, (data1*50) + (data2*15))
def test_many_append(self):
# Bug #1074261 was triggered when reading a file that contained
# many, many members. Create such a file and verify that reading it
# works.
with gzip.open(self.filename, 'wb', 9) as f:
f.write('a')
for i in range(0, 200):
with gzip.open(self.filename, "ab", 9) as f: # append
f.write('a')
# Try reading the file
with gzip.open(self.filename, "rb") as zgfile:
contents = ""
while 1:
ztxt = zgfile.read(8192)
contents += ztxt
if not ztxt: break
self.assertEqual(contents, 'a'*201)
def test_buffered_reader(self):
# Issue #7471: a GzipFile can be wrapped in a BufferedReader for
# performance.
self.test_write()
with gzip.GzipFile(self.filename, 'rb') as f:
with io.BufferedReader(f) as r:
lines = [line for line in r]
self.assertEqual(lines, 50 * data1.splitlines(True))
def test_readline(self):
self.test_write()
# Try .readline() with varying line lengths
with gzip.GzipFile(self.filename, 'rb') as f:
line_length = 0
while 1:
L = f.readline(line_length)
if not L and line_length != 0: break
self.assertTrue(len(L) <= line_length)
line_length = (line_length + 1) % 50
def test_readlines(self):
self.test_write()
# Try .readlines()
with gzip.GzipFile(self.filename, 'rb') as f:
L = f.readlines()
with gzip.GzipFile(self.filename, 'rb') as f:
while 1:
L = f.readlines(150)
if L == []: break
def test_seek_read(self):
self.test_write()
# Try seek, read test
with gzip.GzipFile(self.filename) as f:
while 1:
oldpos = f.tell()
line1 = f.readline()
if not line1: break
newpos = f.tell()
f.seek(oldpos) # negative seek
if len(line1)>10:
amount = 10
else:
amount = len(line1)
line2 = f.read(amount)
self.assertEqual(line1[:amount], line2)
f.seek(newpos) # positive seek
def test_seek_whence(self):
self.test_write()
# Try seek(whence=1), read test
with gzip.GzipFile(self.filename) as f:
f.read(10)
f.seek(10, whence=1)
y = f.read(10)
self.assertEqual(y, data1[20:30])
def test_seek_write(self):
# Try seek, write test
with gzip.GzipFile(self.filename, 'w') as f:
for pos in range(0, 256, 16):
f.seek(pos)
f.write('GZ\n')
def test_mode(self):
self.test_write()
with gzip.GzipFile(self.filename, 'r') as f:
self.assertEqual(f.myfileobj.mode, 'rb')
def test_1647484(self):
for mode in ('wb', 'rb'):
with gzip.GzipFile(self.filename, mode) as f:
self.assertTrue(hasattr(f, "name"))
self.assertEqual(f.name, self.filename)
def test_mtime(self):
mtime = 123456789
with gzip.GzipFile(self.filename, 'w', mtime = mtime) as fWrite:
fWrite.write(data1)
with gzip.GzipFile(self.filename) as fRead:
dataRead = fRead.read()
self.assertEqual(dataRead, data1)
self.assertTrue(hasattr(fRead, 'mtime'))
self.assertEqual(fRead.mtime, mtime)
def test_metadata(self):
mtime = 123456789
with gzip.GzipFile(self.filename, 'w', mtime = mtime) as fWrite:
fWrite.write(data1)
with open(self.filename, 'rb') as fRead:
# see RFC 1952: http://www.faqs.org/rfcs/rfc1952.html
idBytes = fRead.read(2)
self.assertEqual(idBytes, '\x1f\x8b') # gzip ID
cmByte = fRead.read(1)
self.assertEqual(cmByte, '\x08') # deflate
flagsByte = fRead.read(1)
self.assertEqual(flagsByte, '\x08') # only the FNAME flag is set
mtimeBytes = fRead.read(4)
self.assertEqual(mtimeBytes, struct.pack('" in the output file.
fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT)
with os.fdopen(fd, "wb") as f:
with gzip.GzipFile(fileobj=f, mode="w") as g:
self.assertEqual(g.name, "")
def test_read_with_extra(self):
# Gzip data with an extra field
gzdata = (b'\x1f\x8b\x08\x04\xb2\x17cQ\x02\xff'
b'\x05\x00Extra'
b'\x0bI-.\x01\x002\xd1Mx\x04\x00\x00\x00')
with gzip.GzipFile(fileobj=io.BytesIO(gzdata)) as f:
self.assertEqual(f.read(), b'Test')
def test_main(verbose=None):
test_support.run_unittest(TestGzip)
if __name__ == "__main__":
test_main(verbose=True)