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497 lines
17 KiB
Python
497 lines
17 KiB
Python
#! /usr/bin/env python3
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"""Test script for the gzip module.
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"""
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import unittest
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from test import support
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import os
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import io
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import struct
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gzip = support.import_module('gzip')
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data1 = b""" int length=DEFAULTALLOC, err = Z_OK;
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PyObject *RetVal;
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int flushmode = Z_FINISH;
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unsigned long start_total_out;
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"""
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data2 = b"""/* zlibmodule.c -- gzip-compatible data compression */
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/* See http://www.gzip.org/zlib/
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/* See http://www.winimage.com/zLibDll for Windows */
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"""
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class UnseekableIO(io.BytesIO):
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def seekable(self):
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return False
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def tell(self):
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raise io.UnsupportedOperation
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def seek(self, *args):
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raise io.UnsupportedOperation
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class BaseTest(unittest.TestCase):
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filename = support.TESTFN
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def setUp(self):
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support.unlink(self.filename)
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def tearDown(self):
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support.unlink(self.filename)
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class TestGzip(BaseTest):
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def test_write(self):
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with gzip.GzipFile(self.filename, 'wb') as f:
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f.write(data1 * 50)
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# Try flush and fileno.
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f.flush()
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f.fileno()
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if hasattr(os, 'fsync'):
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os.fsync(f.fileno())
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f.close()
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# Test multiple close() calls.
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f.close()
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def test_read(self):
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self.test_write()
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# Try reading.
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with gzip.GzipFile(self.filename, 'r') as f:
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d = f.read()
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self.assertEqual(d, data1*50)
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def test_read1(self):
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self.test_write()
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blocks = []
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nread = 0
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with gzip.GzipFile(self.filename, 'r') as f:
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while True:
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d = f.read1()
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if not d:
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break
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blocks.append(d)
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nread += len(d)
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# Check that position was updated correctly (see issue10791).
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self.assertEqual(f.tell(), nread)
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self.assertEqual(b''.join(blocks), data1 * 50)
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def test_io_on_closed_object(self):
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# Test that I/O operations on closed GzipFile objects raise a
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# ValueError, just like the corresponding functions on file objects.
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# Write to a file, open it for reading, then close it.
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self.test_write()
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f = gzip.GzipFile(self.filename, 'r')
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f.close()
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with self.assertRaises(ValueError):
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f.read(1)
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with self.assertRaises(ValueError):
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f.seek(0)
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with self.assertRaises(ValueError):
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f.tell()
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# Open the file for writing, then close it.
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f = gzip.GzipFile(self.filename, 'w')
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f.close()
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with self.assertRaises(ValueError):
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f.write(b'')
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with self.assertRaises(ValueError):
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f.flush()
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def test_append(self):
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self.test_write()
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# Append to the previous file
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with gzip.GzipFile(self.filename, 'ab') as f:
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f.write(data2 * 15)
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with gzip.GzipFile(self.filename, 'rb') as f:
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d = f.read()
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self.assertEqual(d, (data1*50) + (data2*15))
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def test_many_append(self):
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# Bug #1074261 was triggered when reading a file that contained
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# many, many members. Create such a file and verify that reading it
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# works.
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with gzip.GzipFile(self.filename, 'wb', 9) as f:
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f.write(b'a')
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for i in range(0, 200):
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with gzip.GzipFile(self.filename, "ab", 9) as f: # append
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f.write(b'a')
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# Try reading the file
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with gzip.GzipFile(self.filename, "rb") as zgfile:
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contents = b""
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while 1:
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ztxt = zgfile.read(8192)
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contents += ztxt
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if not ztxt: break
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self.assertEqual(contents, b'a'*201)
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def test_buffered_reader(self):
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# Issue #7471: a GzipFile can be wrapped in a BufferedReader for
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# performance.
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self.test_write()
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with gzip.GzipFile(self.filename, 'rb') as f:
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with io.BufferedReader(f) as r:
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lines = [line for line in r]
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self.assertEqual(lines, 50 * data1.splitlines(keepends=True))
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def test_readline(self):
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self.test_write()
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# Try .readline() with varying line lengths
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with gzip.GzipFile(self.filename, 'rb') as f:
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line_length = 0
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while 1:
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L = f.readline(line_length)
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if not L and line_length != 0: break
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self.assertTrue(len(L) <= line_length)
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line_length = (line_length + 1) % 50
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def test_readlines(self):
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self.test_write()
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# Try .readlines()
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with gzip.GzipFile(self.filename, 'rb') as f:
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L = f.readlines()
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with gzip.GzipFile(self.filename, 'rb') as f:
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while 1:
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L = f.readlines(150)
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if L == []: break
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def test_seek_read(self):
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self.test_write()
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# Try seek, read test
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with gzip.GzipFile(self.filename) as f:
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while 1:
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oldpos = f.tell()
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line1 = f.readline()
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if not line1: break
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newpos = f.tell()
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f.seek(oldpos) # negative seek
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if len(line1)>10:
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amount = 10
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else:
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amount = len(line1)
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line2 = f.read(amount)
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self.assertEqual(line1[:amount], line2)
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f.seek(newpos) # positive seek
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def test_seek_whence(self):
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self.test_write()
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# Try seek(whence=1), read test
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with gzip.GzipFile(self.filename) as f:
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f.read(10)
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f.seek(10, whence=1)
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y = f.read(10)
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self.assertEqual(y, data1[20:30])
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def test_seek_write(self):
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# Try seek, write test
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with gzip.GzipFile(self.filename, 'w') as f:
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for pos in range(0, 256, 16):
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f.seek(pos)
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f.write(b'GZ\n')
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def test_mode(self):
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self.test_write()
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with gzip.GzipFile(self.filename, 'r') as f:
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self.assertEqual(f.myfileobj.mode, 'rb')
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def test_1647484(self):
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for mode in ('wb', 'rb'):
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with gzip.GzipFile(self.filename, mode) as f:
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self.assertTrue(hasattr(f, "name"))
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self.assertEqual(f.name, self.filename)
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def test_paddedfile_getattr(self):
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self.test_write()
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with gzip.GzipFile(self.filename, 'rb') as f:
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self.assertTrue(hasattr(f.fileobj, "name"))
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self.assertEqual(f.fileobj.name, self.filename)
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def test_mtime(self):
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mtime = 123456789
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with gzip.GzipFile(self.filename, 'w', mtime = mtime) as fWrite:
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fWrite.write(data1)
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with gzip.GzipFile(self.filename) as fRead:
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dataRead = fRead.read()
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self.assertEqual(dataRead, data1)
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self.assertTrue(hasattr(fRead, 'mtime'))
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self.assertEqual(fRead.mtime, mtime)
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def test_metadata(self):
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mtime = 123456789
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with gzip.GzipFile(self.filename, 'w', mtime = mtime) as fWrite:
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fWrite.write(data1)
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with open(self.filename, 'rb') as fRead:
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# see RFC 1952: http://www.faqs.org/rfcs/rfc1952.html
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idBytes = fRead.read(2)
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self.assertEqual(idBytes, b'\x1f\x8b') # gzip ID
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cmByte = fRead.read(1)
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self.assertEqual(cmByte, b'\x08') # deflate
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flagsByte = fRead.read(1)
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self.assertEqual(flagsByte, b'\x08') # only the FNAME flag is set
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mtimeBytes = fRead.read(4)
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self.assertEqual(mtimeBytes, struct.pack('<i', mtime)) # little-endian
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xflByte = fRead.read(1)
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self.assertEqual(xflByte, b'\x02') # maximum compression
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osByte = fRead.read(1)
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self.assertEqual(osByte, b'\xff') # OS "unknown" (OS-independent)
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# Since the FNAME flag is set, the zero-terminated filename follows.
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# RFC 1952 specifies that this is the name of the input file, if any.
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# However, the gzip module defaults to storing the name of the output
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# file in this field.
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expected = self.filename.encode('Latin-1') + b'\x00'
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nameBytes = fRead.read(len(expected))
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self.assertEqual(nameBytes, expected)
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# Since no other flags were set, the header ends here.
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# Rather than process the compressed data, let's seek to the trailer.
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fRead.seek(os.stat(self.filename).st_size - 8)
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crc32Bytes = fRead.read(4) # CRC32 of uncompressed data [data1]
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self.assertEqual(crc32Bytes, b'\xaf\xd7d\x83')
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isizeBytes = fRead.read(4)
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self.assertEqual(isizeBytes, struct.pack('<i', len(data1)))
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def test_with_open(self):
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# GzipFile supports the context management protocol
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with gzip.GzipFile(self.filename, "wb") as f:
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f.write(b"xxx")
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f = gzip.GzipFile(self.filename, "rb")
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f.close()
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try:
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with f:
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pass
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except ValueError:
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pass
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else:
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self.fail("__enter__ on a closed file didn't raise an exception")
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try:
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with gzip.GzipFile(self.filename, "wb") as f:
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1/0
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except ZeroDivisionError:
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pass
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else:
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self.fail("1/0 didn't raise an exception")
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def test_zero_padded_file(self):
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with gzip.GzipFile(self.filename, "wb") as f:
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f.write(data1 * 50)
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# Pad the file with zeroes
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with open(self.filename, "ab") as f:
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f.write(b"\x00" * 50)
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with gzip.GzipFile(self.filename, "rb") as f:
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d = f.read()
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self.assertEqual(d, data1 * 50, "Incorrect data in file")
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def test_non_seekable_file(self):
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uncompressed = data1 * 50
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buf = UnseekableIO()
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with gzip.GzipFile(fileobj=buf, mode="wb") as f:
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f.write(uncompressed)
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compressed = buf.getvalue()
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buf = UnseekableIO(compressed)
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with gzip.GzipFile(fileobj=buf, mode="rb") as f:
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self.assertEqual(f.read(), uncompressed)
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def test_peek(self):
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uncompressed = data1 * 200
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with gzip.GzipFile(self.filename, "wb") as f:
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f.write(uncompressed)
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def sizes():
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while True:
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for n in range(5, 50, 10):
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yield n
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with gzip.GzipFile(self.filename, "rb") as f:
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f.max_read_chunk = 33
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nread = 0
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for n in sizes():
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s = f.peek(n)
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if s == b'':
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break
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self.assertEqual(f.read(len(s)), s)
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nread += len(s)
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self.assertEqual(f.read(100), b'')
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self.assertEqual(nread, len(uncompressed))
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def test_textio_readlines(self):
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# Issue #10791: TextIOWrapper.readlines() fails when wrapping GzipFile.
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lines = (data1 * 50).decode("ascii").splitlines(keepends=True)
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self.test_write()
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with gzip.GzipFile(self.filename, 'r') as f:
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with io.TextIOWrapper(f, encoding="ascii") as t:
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self.assertEqual(t.readlines(), lines)
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def test_fileobj_from_fdopen(self):
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# Issue #13781: Opening a GzipFile for writing fails when using a
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# fileobj created with os.fdopen().
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fd = os.open(self.filename, os.O_WRONLY | os.O_CREAT)
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with os.fdopen(fd, "wb") as f:
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with gzip.GzipFile(fileobj=f, mode="w") as g:
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pass
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def test_bytes_filename(self):
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str_filename = self.filename
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try:
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bytes_filename = str_filename.encode("ascii")
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except UnicodeEncodeError:
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self.skipTest("Temporary file name needs to be ASCII")
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with gzip.GzipFile(bytes_filename, "wb") as f:
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f.write(data1 * 50)
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with gzip.GzipFile(bytes_filename, "rb") as f:
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self.assertEqual(f.read(), data1 * 50)
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# Sanity check that we are actually operating on the right file.
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with gzip.GzipFile(str_filename, "rb") as f:
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self.assertEqual(f.read(), data1 * 50)
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# Testing compress/decompress shortcut functions
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def test_compress(self):
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for data in [data1, data2]:
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for args in [(), (1,), (6,), (9,)]:
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datac = gzip.compress(data, *args)
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self.assertEqual(type(datac), bytes)
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with gzip.GzipFile(fileobj=io.BytesIO(datac), mode="rb") as f:
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self.assertEqual(f.read(), data)
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def test_decompress(self):
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for data in (data1, data2):
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buf = io.BytesIO()
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with gzip.GzipFile(fileobj=buf, mode="wb") as f:
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f.write(data)
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self.assertEqual(gzip.decompress(buf.getvalue()), data)
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# Roundtrip with compress
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datac = gzip.compress(data)
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self.assertEqual(gzip.decompress(datac), data)
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class TestOpen(BaseTest):
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def test_binary_modes(self):
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uncompressed = data1 * 50
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with gzip.open(self.filename, "wb") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read())
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self.assertEqual(file_data, uncompressed)
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with gzip.open(self.filename, "rb") as f:
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self.assertEqual(f.read(), uncompressed)
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with gzip.open(self.filename, "ab") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read())
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self.assertEqual(file_data, uncompressed * 2)
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def test_implicit_binary_modes(self):
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# Test implicit binary modes (no "b" or "t" in mode string).
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uncompressed = data1 * 50
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with gzip.open(self.filename, "w") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read())
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self.assertEqual(file_data, uncompressed)
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with gzip.open(self.filename, "r") as f:
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self.assertEqual(f.read(), uncompressed)
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with gzip.open(self.filename, "a") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read())
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self.assertEqual(file_data, uncompressed * 2)
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def test_text_modes(self):
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uncompressed = data1.decode("ascii") * 50
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uncompressed_raw = uncompressed.replace("\n", os.linesep)
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with gzip.open(self.filename, "wt") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read()).decode("ascii")
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self.assertEqual(file_data, uncompressed_raw)
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with gzip.open(self.filename, "rt") as f:
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self.assertEqual(f.read(), uncompressed)
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with gzip.open(self.filename, "at") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read()).decode("ascii")
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self.assertEqual(file_data, uncompressed_raw * 2)
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def test_fileobj(self):
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uncompressed_bytes = data1 * 50
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uncompressed_str = uncompressed_bytes.decode("ascii")
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compressed = gzip.compress(uncompressed_bytes)
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with gzip.open(io.BytesIO(compressed), "r") as f:
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self.assertEqual(f.read(), uncompressed_bytes)
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with gzip.open(io.BytesIO(compressed), "rb") as f:
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self.assertEqual(f.read(), uncompressed_bytes)
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with gzip.open(io.BytesIO(compressed), "rt") as f:
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self.assertEqual(f.read(), uncompressed_str)
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def test_bad_params(self):
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# Test invalid parameter combinations.
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with self.assertRaises(TypeError):
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gzip.open(123.456)
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with self.assertRaises(ValueError):
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gzip.open(self.filename, "wbt")
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with self.assertRaises(ValueError):
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gzip.open(self.filename, "rb", encoding="utf-8")
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with self.assertRaises(ValueError):
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gzip.open(self.filename, "rb", errors="ignore")
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with self.assertRaises(ValueError):
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gzip.open(self.filename, "rb", newline="\n")
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def test_encoding(self):
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# Test non-default encoding.
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uncompressed = data1.decode("ascii") * 50
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uncompressed_raw = uncompressed.replace("\n", os.linesep)
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with gzip.open(self.filename, "wt", encoding="utf-16") as f:
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f.write(uncompressed)
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with open(self.filename, "rb") as f:
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file_data = gzip.decompress(f.read()).decode("utf-16")
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self.assertEqual(file_data, uncompressed_raw)
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with gzip.open(self.filename, "rt", encoding="utf-16") as f:
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self.assertEqual(f.read(), uncompressed)
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def test_encoding_error_handler(self):
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# Test with non-default encoding error handler.
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with gzip.open(self.filename, "wb") as f:
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f.write(b"foo\xffbar")
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with gzip.open(self.filename, "rt", encoding="ascii", errors="ignore") \
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as f:
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self.assertEqual(f.read(), "foobar")
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def test_newline(self):
|
|
# Test with explicit newline (universal newline mode disabled).
|
|
uncompressed = data1.decode("ascii") * 50
|
|
with gzip.open(self.filename, "wt", newline="\n") as f:
|
|
f.write(uncompressed)
|
|
with gzip.open(self.filename, "rt", newline="\r") as f:
|
|
self.assertEqual(f.readlines(), [uncompressed])
|
|
|
|
def test_main(verbose=None):
|
|
support.run_unittest(TestGzip, TestOpen)
|
|
|
|
if __name__ == "__main__":
|
|
test_main(verbose=True)
|