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test_gzip.py
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1156 lines (994 loc) · 43.7 KB
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"""Test script for the gzip module.
"""
import array
import functools
import gc
import io
import os
import struct
import sys
import unittest
from subprocess import PIPE, Popen
from test.support import catch_unraisable_exception
from test.support import force_not_colorized_test_class, import_helper
from test.support import os_helper
from test.support import _4G, bigmemtest, requires_subprocess
from test.support.script_helper import assert_python_ok, assert_python_failure
gzip = import_helper.import_module('gzip')
zlib = import_helper.import_module('zlib')
data1 = b""" int length=DEFAULTALLOC, err = Z_OK;
PyObject *RetVal;
int flushmode = Z_FINISH;
unsigned long start_total_out;
"""
data2 = b"""/* zlibmodule.c -- gzip-compatible data compression */
/* See http://www.gzip.org/zlib/
/* See http://www.winimage.com/zLibDll for Windows */
"""
TEMPDIR = os.path.abspath(os_helper.TESTFN) + '-gzdir'
class UnseekableIO(io.BytesIO):
def seekable(self):
return False
def tell(self):
raise io.UnsupportedOperation
def seek(self, *args):
raise io.UnsupportedOperation
class BaseTest(unittest.TestCase):
filename = os_helper.TESTFN
def setUp(self):
os_helper.unlink(self.filename)
def tearDown(self):
os_helper.unlink(self.filename)
class TestGzip(BaseTest):
def write_and_read_back(self, data, mode='b'):
b_data = bytes(data)
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)
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()
def test_write_read_with_pathlike_file(self):
filename = os_helper.FakePath(self.filename)
with gzip.GzipFile(filename, 'w') as f:
f.write(data1 * 50)
self.assertIsInstance(f.name, str)
self.assertEqual(f.name, self.filename)
with gzip.GzipFile(filename, 'a') as f:
f.write(data1)
with gzip.GzipFile(filename) as f:
d = f.read()
self.assertEqual(d, data1 * 51)
self.assertIsInstance(f.name, str)
self.assertEqual(f.name, self.filename)
# 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))
m = memoryview(bytes(range(256)))
data = m.cast('B', shape=[8,8,4])
self.write_and_read_back(data)
def test_write_bytearray(self):
self.write_and_read_back(bytearray(data1 * 50))
def test_write_array(self):
self.write_and_read_back(array.array('I', data1 * 40))
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(TypeError):
f.write('')
with self.assertRaises(TypeError):
f.write([])
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_read1(self):
self.test_write()
blocks = []
nread = 0
with gzip.GzipFile(self.filename, 'r') as f:
while True:
d = f.read1()
if not d:
break
blocks.append(d)
nread += len(d)
# Check that position was updated correctly (see issue10791).
self.assertEqual(f.tell(), nread)
self.assertEqual(b''.join(blocks), data1 * 50)
def test_readinto(self):
# 10MB of uncompressible data to ensure multiple reads
large_data = os.urandom(10 * 2**20)
with gzip.GzipFile(self.filename, 'wb') as f:
f.write(large_data)
buf = bytearray(len(large_data))
with gzip.GzipFile(self.filename, 'r') as f:
nbytes = f.readinto(buf)
self.assertEqual(nbytes, len(large_data))
self.assertEqual(buf, large_data)
def test_readinto1(self):
# 10MB of uncompressible data to ensure multiple reads
large_data = os.urandom(10 * 2**20)
with gzip.GzipFile(self.filename, 'wb') as f:
f.write(large_data)
nread = 0
buf = bytearray(len(large_data))
memview = memoryview(buf) # Simplifies slicing
with gzip.GzipFile(self.filename, 'r') as f:
for count in range(200):
nbytes = f.readinto1(memview[nread:])
if not nbytes:
break
nread += nbytes
self.assertEqual(f.tell(), nread)
self.assertEqual(buf, large_data)
# readinto1() should require multiple loops
self.assertGreater(count, 1)
@bigmemtest(size=_4G, memuse=1)
def test_read_large(self, size):
# Read chunk size over UINT_MAX should be supported, despite zlib's
# limitation per low-level call
compressed = gzip.compress(data1, compresslevel=1)
f = gzip.GzipFile(fileobj=io.BytesIO(compressed), mode='rb')
self.assertEqual(f.read(size), data1)
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')
fileobj = f.fileobj
self.assertFalse(fileobj.closed)
f.close()
self.assertTrue(fileobj.closed)
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')
fileobj = f.fileobj
self.assertFalse(fileobj.closed)
f.close()
self.assertTrue(fileobj.closed)
with self.assertRaises(ValueError):
f.write(b'')
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.GzipFile(self.filename, 'wb', 9) as f:
f.write(b'a')
for i in range(0, 200):
with gzip.GzipFile(self.filename, "ab", 9) as f: # append
f.write(b'a')
# Try reading the file
with gzip.GzipFile(self.filename, "rb") as zgfile:
contents = b""
while 1:
ztxt = zgfile.read(8192)
contents += ztxt
if not ztxt: break
self.assertEqual(contents, b'a'*201)
def test_exclusive_write(self):
with gzip.GzipFile(self.filename, 'xb') as f:
f.write(data1 * 50)
with gzip.GzipFile(self.filename, 'rb') as f:
self.assertEqual(f.read(), data1 * 50)
with self.assertRaises(FileExistsError):
gzip.GzipFile(self.filename, 'xb')
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(keepends=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(b'GZ\n')
def test_mode(self):
self.test_write()
with gzip.GzipFile(self.filename, 'r') as f:
self.assertEqual(f.myfileobj.mode, 'rb')
os_helper.unlink(self.filename)
with gzip.GzipFile(self.filename, 'x') as f:
self.assertEqual(f.myfileobj.mode, 'xb')
def test_1647484(self):
for mode in ('wb', 'rb'):
with gzip.GzipFile(self.filename, mode) as f:
self.assertHasAttr(f, "name")
self.assertEqual(f.name, self.filename)
def test_paddedfile_getattr(self):
self.test_write()
with gzip.GzipFile(self.filename, 'rb') as f:
self.assertHasAttr(f.fileobj, "name")
self.assertEqual(f.fileobj.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:
self.assertHasAttr(fRead, 'mtime')
self.assertIsNone(fRead.mtime)
dataRead = fRead.read()
self.assertEqual(dataRead, data1)
self.assertEqual(fRead.mtime, mtime)
def test_metadata(self):
mtime = 123456789
with gzip.GzipFile(self.filename, 'w', mtime = mtime, compresslevel = 9) 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, b'\x1f\x8b') # gzip ID
cmByte = fRead.read(1)
self.assertEqual(cmByte, b'\x08') # deflate
try:
expectedname = self.filename.encode('Latin-1') + b'\x00'
expectedflags = b'\x08' # only the FNAME flag is set
except UnicodeEncodeError:
expectedname = b''
expectedflags = b'\x00'
flagsByte = fRead.read(1)
self.assertEqual(flagsByte, expectedflags)
mtimeBytes = fRead.read(4)
self.assertEqual(mtimeBytes, struct.pack('<i', mtime)) # little-endian
xflByte = fRead.read(1)
self.assertEqual(xflByte, b'\x02') # maximum compression
osByte = fRead.read(1)
self.assertEqual(osByte, b'\xff') # OS "unknown" (OS-independent)
# Since the FNAME flag is set, the zero-terminated filename follows.
# RFC 1952 specifies that this is the name of the input file, if any.
# However, the gzip module defaults to storing the name of the output
# file in this field.
nameBytes = fRead.read(len(expectedname))
self.assertEqual(nameBytes, expectedname)
# Since no other flags were set, the header ends here.
# Rather than process the compressed data, let's seek to the trailer.
fRead.seek(os.stat(self.filename).st_size - 8)
crc32Bytes = fRead.read(4) # CRC32 of uncompressed data [data1]
self.assertEqual(crc32Bytes, b'\xaf\xd7d\x83')
isizeBytes = fRead.read(4)
self.assertEqual(isizeBytes, struct.pack('<i', len(data1)))
def test_metadata_ascii_name(self):
self.filename = os_helper.TESTFN_ASCII
self.test_metadata()
def test_compresslevel_metadata(self):
# see RFC 1952: http://www.faqs.org/rfcs/rfc1952.html
# specifically, discussion of XFL in section 2.3.1
cases = [
('fast', 1, b'\x04'),
('best', 9, b'\x02'),
('tradeoff', 6, b'\x00'),
]
xflOffset = 8
for (name, level, expectedXflByte) in cases:
with self.subTest(name):
fWrite = gzip.GzipFile(self.filename, 'w', compresslevel=level)
with fWrite:
fWrite.write(data1)
with open(self.filename, 'rb') as fRead:
fRead.seek(xflOffset)
xflByte = fRead.read(1)
self.assertEqual(xflByte, expectedXflByte)
def test_with_open(self):
# GzipFile supports the context management protocol
with gzip.GzipFile(self.filename, "wb") as f:
f.write(b"xxx")
f = gzip.GzipFile(self.filename, "rb")
f.close()
try:
with f:
pass
except ValueError:
pass
else:
self.fail("__enter__ on a closed file didn't raise an exception")
try:
with gzip.GzipFile(self.filename, "wb") as f:
1/0
except ZeroDivisionError:
pass
else:
self.fail("1/0 didn't raise an exception")
def test_zero_padded_file(self):
with gzip.GzipFile(self.filename, "wb") as f:
f.write(data1 * 50)
# Pad the file with zeroes
with open(self.filename, "ab") as f:
f.write(b"\x00" * 50)
with gzip.GzipFile(self.filename, "rb") as f:
d = f.read()
self.assertEqual(d, data1 * 50, "Incorrect data in file")
def test_gzip_BadGzipFile_exception(self):
self.assertIsSubclass(gzip.BadGzipFile, OSError)
def test_bad_gzip_file(self):
with open(self.filename, 'wb') as file:
file.write(data1 * 50)
with gzip.GzipFile(self.filename, 'r') as file:
self.assertRaises(gzip.BadGzipFile, file.readlines)
def test_non_seekable_file(self):
uncompressed = data1 * 50
buf = UnseekableIO()
with gzip.GzipFile(fileobj=buf, mode="wb") as f:
f.write(uncompressed)
compressed = buf.getvalue()
buf = UnseekableIO(compressed)
with gzip.GzipFile(fileobj=buf, mode="rb") as f:
self.assertEqual(f.read(), uncompressed)
def test_peek(self):
uncompressed = data1 * 200
with gzip.GzipFile(self.filename, "wb") as f:
f.write(uncompressed)
def sizes():
while True:
for n in range(5, 50, 10):
yield n
with gzip.GzipFile(self.filename, "rb") as f:
f.max_read_chunk = 33
nread = 0
for n in sizes():
s = f.peek(n)
if s == b'':
break
self.assertEqual(f.read(len(s)), s)
nread += len(s)
self.assertEqual(f.read(100), b'')
self.assertEqual(nread, len(uncompressed))
def test_textio_readlines(self):
# Issue #10791: TextIOWrapper.readlines() fails when wrapping GzipFile.
lines = (data1 * 50).decode("ascii").splitlines(keepends=True)
self.test_write()
with gzip.GzipFile(self.filename, 'r') as f:
with io.TextIOWrapper(f, encoding="ascii") as t:
self.assertEqual(t.readlines(), lines)
def test_fileobj_with_name(self):
with open(self.filename, "xb") as raw:
with gzip.GzipFile(fileobj=raw, mode="x") as f:
f.write(b'one')
self.assertEqual(f.name, raw.name)
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
self.assertIs(f.closed, False)
self.assertIs(f.closed, True)
self.assertEqual(f.name, raw.name)
self.assertRaises(AttributeError, f.fileno)
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
with open(self.filename, "wb") as raw:
with gzip.GzipFile(fileobj=raw, mode="w") as f:
f.write(b'two')
self.assertEqual(f.name, raw.name)
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
self.assertIs(f.closed, False)
self.assertIs(f.closed, True)
self.assertEqual(f.name, raw.name)
self.assertRaises(AttributeError, f.fileno)
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
with open(self.filename, "ab") as raw:
with gzip.GzipFile(fileobj=raw, mode="a") as f:
f.write(b'three')
self.assertEqual(f.name, raw.name)
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
self.assertIs(f.closed, False)
self.assertIs(f.closed, True)
self.assertEqual(f.name, raw.name)
self.assertRaises(AttributeError, f.fileno)
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
with open(self.filename, "rb") as raw:
with gzip.GzipFile(fileobj=raw, mode="r") as f:
self.assertEqual(f.read(), b'twothree')
self.assertEqual(f.name, raw.name)
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.mode, gzip.READ)
self.assertIs(f.readable(), True)
self.assertIs(f.writable(), False)
self.assertIs(f.seekable(), True)
self.assertIs(f.closed, False)
self.assertIs(f.closed, True)
self.assertEqual(f.name, raw.name)
self.assertRaises(AttributeError, f.fileno)
self.assertEqual(f.mode, gzip.READ)
self.assertIs(f.readable(), True)
self.assertIs(f.writable(), False)
self.assertIs(f.seekable(), True)
def test_fileobj_from_fdopen(self):
# Issue #13781: Opening a GzipFile for writing fails when using a
# fileobj created with os.fdopen().
fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT | os.O_EXCL)
with os.fdopen(fd, "xb") as raw:
with gzip.GzipFile(fileobj=raw, mode="x") as f:
f.write(b'one')
self.assertEqual(f.name, '')
self.assertEqual(f.fileno(), raw.fileno())
self.assertIs(f.closed, True)
self.assertEqual(f.name, '')
self.assertRaises(AttributeError, f.fileno)
fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT | os.O_TRUNC)
with os.fdopen(fd, "wb") as raw:
with gzip.GzipFile(fileobj=raw, mode="w") as f:
f.write(b'two')
self.assertEqual(f.name, '')
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.name, '')
self.assertRaises(AttributeError, f.fileno)
fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT | os.O_APPEND)
with os.fdopen(fd, "ab") as raw:
with gzip.GzipFile(fileobj=raw, mode="a") as f:
f.write(b'three')
self.assertEqual(f.name, '')
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.name, '')
self.assertRaises(AttributeError, f.fileno)
fd = os.open(self.filename, os.O_RDONLY)
with os.fdopen(fd, "rb") as raw:
with gzip.GzipFile(fileobj=raw, mode="r") as f:
self.assertEqual(f.read(), b'twothree')
self.assertEqual(f.name, '')
self.assertEqual(f.fileno(), raw.fileno())
self.assertEqual(f.name, '')
self.assertRaises(AttributeError, f.fileno)
def test_fileobj_mode(self):
self.assertEqual(gzip.READ, 'rb')
self.assertEqual(gzip.WRITE, 'wb')
gzip.GzipFile(self.filename, "wb").close()
with open(self.filename, "r+b") as f:
with gzip.GzipFile(fileobj=f, mode='r') as g:
self.assertEqual(g.mode, gzip.READ)
with gzip.GzipFile(fileobj=f, mode='w') as g:
self.assertEqual(g.mode, gzip.WRITE)
with gzip.GzipFile(fileobj=f, mode='a') as g:
self.assertEqual(g.mode, gzip.WRITE)
with gzip.GzipFile(fileobj=f, mode='x') as g:
self.assertEqual(g.mode, gzip.WRITE)
with self.assertRaises(ValueError):
gzip.GzipFile(fileobj=f, mode='z')
for mode in "rb", "r+b":
with open(self.filename, mode) as f:
with gzip.GzipFile(fileobj=f) as g:
self.assertEqual(g.mode, gzip.READ)
for mode in "wb", "ab", "xb", "wb+", "ab+", "xb+":
if "x" in mode:
os_helper.unlink(self.filename)
with open(self.filename, mode) as f:
with self.assertWarns(FutureWarning):
g = gzip.GzipFile(fileobj=f)
with g:
self.assertEqual(g.mode, gzip.WRITE)
def test_bytes_filename(self):
str_filename = self.filename
bytes_filename = os.fsencode(str_filename)
with gzip.GzipFile(bytes_filename, "wb") as f:
f.write(data1 * 50)
self.assertEqual(f.name, bytes_filename)
with gzip.GzipFile(bytes_filename, "rb") as f:
self.assertEqual(f.read(), data1 * 50)
self.assertEqual(f.name, bytes_filename)
# Sanity check that we are actually operating on the right file.
with gzip.GzipFile(str_filename, "rb") as f:
self.assertEqual(f.read(), data1 * 50)
self.assertEqual(f.name, str_filename)
def test_fileobj_without_name(self):
bio = io.BytesIO()
with gzip.GzipFile(fileobj=bio, mode='wb') as f:
f.write(data1 * 50)
self.assertEqual(f.name, '')
self.assertRaises(io.UnsupportedOperation, f.fileno)
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
self.assertIs(f.closed, False)
self.assertIs(f.closed, True)
self.assertEqual(f.name, '')
self.assertRaises(AttributeError, f.fileno)
self.assertEqual(f.mode, gzip.WRITE)
self.assertIs(f.readable(), False)
self.assertIs(f.writable(), True)
self.assertIs(f.seekable(), True)
bio.seek(0)
with gzip.GzipFile(fileobj=bio, mode='rb') as f:
self.assertEqual(f.read(), data1 * 50)
self.assertEqual(f.name, '')
self.assertRaises(io.UnsupportedOperation, f.fileno)
self.assertEqual(f.mode, gzip.READ)
self.assertIs(f.readable(), True)
self.assertIs(f.writable(), False)
self.assertIs(f.seekable(), True)
self.assertIs(f.closed, False)
self.assertIs(f.closed, True)
self.assertEqual(f.name, '')
self.assertRaises(AttributeError, f.fileno)
self.assertEqual(f.mode, gzip.READ)
self.assertIs(f.readable(), True)
self.assertIs(f.writable(), False)
self.assertIs(f.seekable(), True)
def test_fileobj_and_filename(self):
filename2 = self.filename + 'new'
with (open(self.filename, 'wb') as fileobj,
gzip.GzipFile(fileobj=fileobj, filename=filename2, mode='wb') as f):
f.write(data1 * 50)
self.assertEqual(f.name, filename2)
with (open(self.filename, 'rb') as fileobj,
gzip.GzipFile(fileobj=fileobj, filename=filename2, mode='rb') as f):
self.assertEqual(f.read(), data1 * 50)
self.assertEqual(f.name, filename2)
# Sanity check that we are actually operating on the right file.
with gzip.GzipFile(self.filename, 'rb') as f:
self.assertEqual(f.read(), data1 * 50)
self.assertEqual(f.name, self.filename)
def test_decompress_limited(self):
"""Decompressed data buffering should be limited"""
bomb = gzip.compress(b'\0' * int(2e6), compresslevel=9)
self.assertLess(len(bomb), io.DEFAULT_BUFFER_SIZE)
bomb = io.BytesIO(bomb)
decomp = gzip.GzipFile(fileobj=bomb)
self.assertEqual(decomp.read(1), b'\0')
max_decomp = 1 + io.DEFAULT_BUFFER_SIZE
self.assertLessEqual(decomp._buffer.raw.tell(), max_decomp,
"Excessive amount of data was decompressed")
# Testing compress/decompress shortcut functions
def test_compress(self):
for data in [data1, data2]:
for args in [(), (1,), (6,), (9,)]:
datac = gzip.compress(data, *args)
self.assertEqual(type(datac), bytes)
with gzip.GzipFile(fileobj=io.BytesIO(datac), mode="rb") as f:
self.assertEqual(f.read(), data)
def test_compress_mtime(self):
mtime = 123456789
for data in [data1, data2]:
for args in [(), (1,), (6,), (9,)]:
with self.subTest(data=data, args=args):
datac = gzip.compress(data, *args, mtime=mtime)
self.assertEqual(type(datac), bytes)
with gzip.GzipFile(fileobj=io.BytesIO(datac), mode="rb") as f:
f.read(1) # to set mtime attribute
self.assertEqual(f.mtime, mtime)
def test_compress_mtime_default(self):
# test for gh-125260
datac = gzip.compress(data1, mtime=0)
datac2 = gzip.compress(data1)
self.assertEqual(datac, datac2)
datac3 = gzip.compress(data1, mtime=None)
self.assertNotEqual(datac, datac3)
with gzip.GzipFile(fileobj=io.BytesIO(datac3), mode="rb") as f:
f.read(1) # to set mtime attribute
self.assertGreater(f.mtime, 1)
def test_compress_correct_level(self):
for mtime in (0, 42):
with self.subTest(mtime=mtime):
nocompress = gzip.compress(data1, compresslevel=0, mtime=mtime)
yescompress = gzip.compress(data1, compresslevel=1, mtime=mtime)
self.assertIn(data1, nocompress)
self.assertNotIn(data1, yescompress)
def test_issue112346(self):
# The OS byte should be 255, this should not change between Python versions.
for mtime in (0, 42):
with self.subTest(mtime=mtime):
compress = gzip.compress(data1, compresslevel=1, mtime=mtime)
self.assertEqual(
struct.unpack("<IxB", compress[4:10]),
(mtime, 255),
"Gzip header does not properly set either mtime or OS byte."
)
def test_decompress(self):
for data in (data1, data2):
buf = io.BytesIO()
with gzip.GzipFile(fileobj=buf, mode="wb") as f:
f.write(data)
self.assertEqual(gzip.decompress(buf.getvalue()), data)
# Roundtrip with compress
datac = gzip.compress(data)
self.assertEqual(gzip.decompress(datac), data)
def test_decompress_truncated_trailer(self):
compressed_data = gzip.compress(data1)
self.assertRaises(EOFError, gzip.decompress, compressed_data[:-4])
def test_decompress_missing_trailer(self):
compressed_data = gzip.compress(data1)
self.assertRaises(EOFError, gzip.decompress, compressed_data[:-8])
def test_read_truncated(self):
data = data1*50
# Drop the CRC (4 bytes) and file size (4 bytes).
truncated = gzip.compress(data)[:-8]
with gzip.GzipFile(fileobj=io.BytesIO(truncated)) as f:
self.assertRaises(EOFError, f.read)
with gzip.GzipFile(fileobj=io.BytesIO(truncated)) as f:
self.assertEqual(f.read(len(data)), data)
self.assertRaises(EOFError, f.read, 1)
# Incomplete 10-byte header.
for i in range(2, 10):
with gzip.GzipFile(fileobj=io.BytesIO(truncated[:i])) as f:
self.assertRaises(EOFError, f.read, 1)
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_prepend_error(self):
# See issue #20875
with gzip.open(self.filename, "wb") as f:
f.write(data1)
with gzip.open(self.filename, "rb") as f:
f._buffer.raw._fp.prepend()
def test_issue44439(self):
q = array.array('Q', [1, 2, 3, 4, 5])
LENGTH = len(q) * q.itemsize
with gzip.GzipFile(fileobj=io.BytesIO(), mode='w') as f:
self.assertEqual(f.write(q), LENGTH)
self.assertEqual(f.tell(), LENGTH)
def test_flush_flushes_compressor(self):
# See issue GH-105808.
b = io.BytesIO()
message = b"important message here."
with gzip.GzipFile(fileobj=b, mode='w') as f:
f.write(message)
f.flush()
partial_data = b.getvalue()
full_data = b.getvalue()
self.assertEqual(gzip.decompress(full_data), message)
# The partial data should contain the gzip header and the complete
# message, but not the end-of-stream markers (so we can't just
# decompress it directly).
with self.assertRaises(EOFError):
gzip.decompress(partial_data)
d = zlib.decompressobj(wbits=-zlib.MAX_WBITS)
f = io.BytesIO(partial_data)
gzip._read_gzip_header(f)
read_message = d.decompress(f.read())
self.assertEqual(read_message, message)
def test_flush_modes(self):
# Make sure the argument to flush is properly passed to the
# zlib.compressobj; see issue GH-105808.
class FakeCompressor:
def __init__(self):
self.modes = []
def compress(self, data):
return b''
def flush(self, mode=-1):
self.modes.append(mode)
return b''
b = io.BytesIO()
fc = FakeCompressor()
with gzip.GzipFile(fileobj=b, mode='w') as f:
f.compress = fc
f.flush()
f.flush(50)
f.flush(zlib_mode=100)
# The implicit close will also flush the compressor.
expected_modes = [
zlib.Z_SYNC_FLUSH,
50,
100,
-1,
]
self.assertEqual(fc.modes, expected_modes)
def test_write_seek_write(self):
# Make sure that offset is up-to-date before seeking
# See issue GH-108111
b = io.BytesIO()
message = b"important message here."
with gzip.GzipFile(fileobj=b, mode='w') as f:
f.write(message)
f.seek(len(message))
f.write(message)
data = b.getvalue()
self.assertEqual(gzip.decompress(data), message * 2)
def test_refloop_unraisable(self):
# Ensure a GzipFile referring to a temporary fileobj deletes cleanly.
# Previously an unraisable exception would occur on close because the
# fileobj would be closed before the GzipFile as the result of a
# reference loop. See issue gh-129726
with catch_unraisable_exception() as cm:
with self.assertWarns(ResourceWarning):
gzip.GzipFile(fileobj=io.BytesIO(), mode="w")
gc.collect()
self.assertIsNone(cm.unraisable)
class TestOpen(BaseTest):
def test_binary_modes(self):
uncompressed = data1 * 50
with gzip.open(self.filename, "wb") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read())
self.assertEqual(file_data, uncompressed)
with gzip.open(self.filename, "rb") as f:
self.assertEqual(f.read(), uncompressed)
with gzip.open(self.filename, "ab") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read())
self.assertEqual(file_data, uncompressed * 2)
with self.assertRaises(FileExistsError):
gzip.open(self.filename, "xb")
os_helper.unlink(self.filename)
with gzip.open(self.filename, "xb") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read())
self.assertEqual(file_data, uncompressed)
def test_pathlike_file(self):
filename = os_helper.FakePath(self.filename)
with gzip.open(filename, "wb") as f:
f.write(data1 * 50)
self.assertEqual(f.name, self.filename)
with gzip.open(filename, "ab") as f:
f.write(data1)
self.assertEqual(f.name, self.filename)
with gzip.open(filename) as f:
self.assertEqual(f.read(), data1 * 51)
self.assertEqual(f.name, self.filename)
def test_implicit_binary_modes(self):
# Test implicit binary modes (no "b" or "t" in mode string).
uncompressed = data1 * 50
with gzip.open(self.filename, "w") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read())
self.assertEqual(file_data, uncompressed)
with gzip.open(self.filename, "r") as f:
self.assertEqual(f.read(), uncompressed)
with gzip.open(self.filename, "a") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read())
self.assertEqual(file_data, uncompressed * 2)
with self.assertRaises(FileExistsError):
gzip.open(self.filename, "x")
os_helper.unlink(self.filename)
with gzip.open(self.filename, "x") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read())
self.assertEqual(file_data, uncompressed)
def test_text_modes(self):
uncompressed = data1.decode("ascii") * 50
uncompressed_raw = uncompressed.replace("\n", os.linesep)
with gzip.open(self.filename, "wt", encoding="ascii") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read()).decode("ascii")
self.assertEqual(file_data, uncompressed_raw)
with gzip.open(self.filename, "rt", encoding="ascii") as f:
self.assertEqual(f.read(), uncompressed)
with gzip.open(self.filename, "at", encoding="ascii") as f:
f.write(uncompressed)
with open(self.filename, "rb") as f:
file_data = gzip.decompress(f.read()).decode("ascii")
self.assertEqual(file_data, uncompressed_raw * 2)
def test_fileobj(self):
uncompressed_bytes = data1 * 50
uncompressed_str = uncompressed_bytes.decode("ascii")
compressed = gzip.compress(uncompressed_bytes)
with gzip.open(io.BytesIO(compressed), "r") as f:
self.assertEqual(f.read(), uncompressed_bytes)
with gzip.open(io.BytesIO(compressed), "rb") as f:
self.assertEqual(f.read(), uncompressed_bytes)
with gzip.open(io.BytesIO(compressed), "rt", encoding="ascii") as f: