diff options
Diffstat (limited to 'Lib/test/test_gzip.py')
| -rw-r--r-- | Lib/test/test_gzip.py | 266 |
1 files changed, 190 insertions, 76 deletions
diff --git a/Lib/test/test_gzip.py b/Lib/test/test_gzip.py index 105882abbc..573879e522 100644 --- a/Lib/test/test_gzip.py +++ b/Lib/test/test_gzip.py @@ -5,8 +5,9 @@ import unittest from test import test_support import os -import gzip - +import io +import struct +gzip = test_support.import_module('gzip') data1 = """ int length=DEFAULTALLOC, err = Z_OK; PyObject *RetVal; @@ -32,14 +33,15 @@ class TestGzip(unittest.TestCase): def test_write(self): - f = gzip.GzipFile(self.filename, 'wb') ; f.write(data1 * 50) - - # Try flush and fileno. - f.flush() - f.fileno() - if hasattr(os, 'fsync'): - os.fsync(f.fileno()) - f.close() + 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() @@ -47,118 +49,230 @@ class TestGzip(unittest.TestCase): def test_read(self): self.test_write() # Try reading. - f = gzip.GzipFile(self.filename, 'r') ; d = f.read() ; f.close() + with gzip.GzipFile(self.filename, 'r') 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 - f = gzip.GzipFile(self.filename, 'ab') ; f.write(data2 * 15) ; f.close() + with gzip.GzipFile(self.filename, 'ab') as f: + f.write(data2 * 15) - f = gzip.GzipFile(self.filename, 'rb') ; d = f.read() ; f.close() + 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. - f = gzip.open(self.filename, 'wb', 9) - f.write('a') - f.close() - for i in range(0,200): - f = gzip.open(self.filename, "ab", 9) # append + with gzip.open(self.filename, 'wb', 9) as f: f.write('a') - f.close() + for i in range(0, 200): + with gzip.open(self.filename, "ab", 9) as f: # append + f.write('a') # Try reading the file - zgfile = gzip.open(self.filename, "rb") - contents = "" - while 1: - ztxt = zgfile.read(8192) - contents += ztxt - if not ztxt: break - zgfile.close() - self.assertEquals(contents, 'a'*201) + 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 - f = gzip.GzipFile(self.filename, 'rb') - line_length = 0 - while 1: - L = f.readline(line_length) - if L == "" and line_length != 0: break - self.assert_(len(L) <= line_length) - line_length = (line_length + 1) % 50 - f.close() + 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() - f = gzip.GzipFile(self.filename, 'rb') - L = f.readlines() - f.close() + with gzip.GzipFile(self.filename, 'rb') as f: + L = f.readlines() - f = gzip.GzipFile(self.filename, 'rb') - while 1: - L = f.readlines(150) - if L == []: break - f.close() + 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 - f = gzip.GzipFile(self.filename) - 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 - f.close() + 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 - f = gzip.GzipFile(self.filename) - f.read(10) - f.seek(10, whence=1) - y = f.read(10) - f.close() - self.assertEquals(y, data1[20:30]) + 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 - f = gzip.GzipFile(self.filename, 'w') - for pos in range(0, 256, 16): - f.seek(pos) - f.write('GZ\n') - f.close() + 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() - f = gzip.GzipFile(self.filename, 'r') - self.assertEqual(f.myfileobj.mode, 'rb') - f.close() + with gzip.GzipFile(self.filename, 'r') as f: + self.assertEqual(f.myfileobj.mode, 'rb') def test_1647484(self): for mode in ('wb', 'rb'): - f = gzip.GzipFile(self.filename, mode) - self.assert_(hasattr(f, "name")) - self.assertEqual(f.name, self.filename) - f.close() + 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('<i', mtime)) # little-endian + + xflByte = fRead.read(1) + self.assertEqual(xflByte, '\x02') # maximum compression + + osByte = fRead.read(1) + self.assertEqual(osByte, '\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. + expected = self.filename.encode('Latin-1') + '\x00' + nameBytes = fRead.read(len(expected)) + self.assertEqual(nameBytes, expected) + + # 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, '\xaf\xd7d\x83') + + isizeBytes = fRead.read(4) + self.assertEqual(isizeBytes, struct.pack('<i', len(data1))) + + 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("\x00" * 50) + + with gzip.GzipFile(self.filename, "rb") as f: + d = f.read() + self.assertEqual(d, data1 * 50, "Incorrect data in file") def test_main(verbose=None): test_support.run_unittest(TestGzip) |