text: from test import support
  from test.support import bigmemtest, _4G
  
  import array
  import unittest
  from io import BytesIO, DEFAULT_BUFFER_SIZE
  import os
  import pickle
  import glob
  import tempfile
  import pathlib
  import random
  import shutil
  import subprocess
  import threading
  from test.support import import_helper
  from test.support import threading_helper
  from test.support.os_helper import unlink
  import _compression
  import sys
  
  
  # Skip tests if the bz2 module doesn't exist.
  bz2 = import_helper.import_module('bz2')
  from bz2 import BZ2File, BZ2Compressor, BZ2Decompressor
  
  has_cmdline_bunzip2 = None
  
  def ext_decompress(data):
      global has_cmdline_bunzip2
      if has_cmdline_bunzip2 is None:
          has_cmdline_bunzip2 = bool(shutil.which('bunzip2'))
      if has_cmdline_bunzip2:
          return subprocess.check_output(['bunzip2'], input=data)
      else:
          return bz2.decompress(data)
  
  class BaseTest(unittest.TestCase):
      "Base for other testcases."
  
      TEXT_LINES = [
          b'root:x:0:0:root:/root:/bin/bash\n',
          b'bin:x:1:1:bin:/bin:\n',
          b'daemon:x:2:2:daemon:/sbin:\n',
          b'adm:x:3:4:adm:/var/adm:\n',
          b'lp:x:4:7:lp:/var/spool/lpd:\n',
          b'sync:x:5:0:sync:/sbin:/bin/sync\n',
          b'shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown\n',
          b'halt:x:7:0:halt:/sbin:/sbin/halt\n',
          b'mail:x:8:12:mail:/var/spool/mail:\n',
          b'news:x:9:13:news:/var/spool/news:\n',
          b'uucp:x:10:14:uucp:/var/spool/uucp:\n',
          b'operator:x:11:0:operator:/root:\n',
          b'games:x:12:100:games:/usr/games:\n',
          b'gopher:x:13:30:gopher:/usr/lib/gopher-data:\n',
          b'ftp:x:14:50:FTP User:/var/ftp:/bin/bash\n',
          b'nobody:x:65534:65534:Nobody:/home:\n',
          b'postfix:x:100:101:postfix:/var/spool/postfix:\n',
          b'niemeyer:x:500:500::/home/niemeyer:/bin/bash\n',
          b'postgres:x:101:102:PostgreSQL Server:/var/lib/pgsql:/bin/bash\n',
          b'mysql:x:102:103:MySQL server:/var/lib/mysql:/bin/bash\n',
          b'www:x:103:104::/var/www:/bin/false\n',
          ]
      TEXT = b''.join(TEXT_LINES)
      DATA = b'BZh91AY&SY.\xc8N\x18\x00\x01>_\x80\x00\x10@\x02\xff\xf0\x01\x07n\x00?\xe7\xff\xe00\x01\x99\xaa\x00\xc0\x03F\x86\x8c#&\x83F\x9a\x03\x06\xa6\xd0\xa6\x93M\x0fQ\xa7\xa8\x06\x804hh\x12$\x11\xa4i4\xf14S\xd2<Q\xb5\x0fH\xd3\xd4\xdd\xd5\x87\xbb\xf8\x94\r\x8f\xafI\x12\xe1\xc9\xf8/E\x00pu\x89\x12]\xc9\xbbDL\nQ\x0e\t1\x12\xdf\xa0\xc0\x97\xac2O9\x89\x13\x94\x0e\x1c7\x0ed\x95I\x0c\xaaJ\xa4\x18L\x10\x05#\x9c\xaf\xba\xbc/\x97\x8a#C\xc8\xe1\x8cW\xf9\xe2\xd0\xd6M\xa7\x8bXa<e\x84t\xcbL\xb3\xa7\xd9\xcd\xd1\xcb\x84.\xaf\xb3\xab\xab\xad`n}\xa0lh\tE,\x8eZ\x15\x17VH>\x88\xe5\xcd9gd6\x0b\n\xe9\x9b\xd5\x8a\x99\xf7\x08.K\x8ev\xfb\xf7xw\xbb\xdf\xa1\x92\xf1\xdd|/";\xa2\xba\x9f\xd5\xb1#A\xb6\xf6\xb3o\xc9\xc5y\\\xebO\xe7\x85\x9a\xbc\xb6f8\x952\xd5\xd7"%\x89>V,\xf7\xa6z\xe2\x9f\xa3\xdf\x11\x11"\xd6E)I\xa9\x13^\xca\xf3r\xd0\x03U\x922\xf26\xec\xb6\xed\x8b\xc3U\x13\x9d\xc5\x170\xa4\xfa^\x92\xacDF\x8a\x97\xd6\x19\xfe\xdd\xb8\xbd\x1a\x9a\x19\xa3\x80ankR\x8b\xe5\xd83]\xa9\xc6\x08\x82f\xf6\xb9"6l$\xb8j@\xc0\x8a\xb0l1..\xbak\x83ls\x15\xbc\xf4\xc1\x13\xbe\xf8E\xb8\x9d\r\xa8\x9dk\x84\xd3n\xfa\xacQ\x07\xb1%y\xaav\xb4\x08\xe0z\x1b\x16\xf5\x04\xe9\xcc\xb9\x08z\x1en7.G\xfc]\xc9\x14\xe1B@\xbb!8`'
      EMPTY_DATA = b'BZh9\x17rE8P\x90\x00\x00\x00\x00'
      BAD_DATA = b'this is not a valid bzip2 file'
  
      # Some tests need more than one block of uncompressed data. Since one block
      # is at least 100,000 bytes, we gather some data dynamically and compress it.
      # Note that this assumes that compression works correctly, so we cannot
      # simply use the bigger test data for all tests.
      test_size = 0
      BIG_TEXT = bytearray(128*1024)
      for fname in glob.glob(os.path.join(glob.escape(os.path.dirname(__file__)), '*.py')):
          with open(fname, 'rb') as fh:
              test_size += fh.readinto(memoryview(BIG_TEXT)[test_size:])
          if test_size > 128*1024:
              break
      BIG_DATA = bz2.compress(BIG_TEXT, compresslevel=1)
  
      def setUp(self):
          fd, self.filename = tempfile.mkstemp()
          os.close(fd)
  
      def tearDown(self):
          unlink(self.filename)
  
  
  class BZ2FileTest(BaseTest):
      "Test the BZ2File class."
  
      def createTempFile(self, streams=1, suffix=b""):
          with open(self.filename, "wb") as f:
              f.write(self.DATA * streams)
              f.write(suffix)
  
      def testBadArgs(self):
          self.assertRaises(TypeError, BZ2File, 123.456)
          self.assertRaises(ValueError, BZ2File, os.devnull, "z")
          self.assertRaises(ValueError, BZ2File, os.devnull, "rx")
          self.assertRaises(ValueError, BZ2File, os.devnull, "rbt")
          self.assertRaises(ValueError, BZ2File, os.devnull, compresslevel=0)
          self.assertRaises(ValueError, BZ2File, os.devnull, compresslevel=10)
  
          # compresslevel is keyword-only
          self.assertRaises(TypeError, BZ2File, os.devnull, "r", 3)
  
      def testRead(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.read, float())
              self.assertEqual(bz2f.read(), self.TEXT)
  
      def testReadBadFile(self):
          self.createTempFile(streams=0, suffix=self.BAD_DATA)
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(OSError, bz2f.read)
  
      def testReadMultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.read, float())
              self.assertEqual(bz2f.read(), self.TEXT * 5)
  
      def testReadMonkeyMultiStream(self):
          # Test BZ2File.read() on a multi-stream archive where a stream
          # boundary coincides with the end of the raw read buffer.
          buffer_size = _compression.BUFFER_SIZE
          _compression.BUFFER_SIZE = len(self.DATA)
          try:
              self.createTempFile(streams=5)
              with BZ2File(self.filename) as bz2f:
                  self.assertRaises(TypeError, bz2f.read, float())
                  self.assertEqual(bz2f.read(), self.TEXT * 5)
          finally:
              _compression.BUFFER_SIZE = buffer_size
  
      def testReadTrailingJunk(self):
          self.createTempFile(suffix=self.BAD_DATA)
          with BZ2File(self.filename) as bz2f:
              self.assertEqual(bz2f.read(), self.TEXT)
  
      def testReadMultiStreamTrailingJunk(self):
          self.createTempFile(streams=5, suffix=self.BAD_DATA)
          with BZ2File(self.filename) as bz2f:
              self.assertEqual(bz2f.read(), self.TEXT * 5)
  
      def testRead0(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.read, float())
              self.assertEqual(bz2f.read(0), b"")
  
      def testReadChunk10(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              text = b''
              while True:
                  str = bz2f.read(10)
                  if not str:
                      break
                  text += str
              self.assertEqual(text, self.TEXT)
  
      def testReadChunk10MultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              text = b''
              while True:
                  str = bz2f.read(10)
                  if not str:
                      break
                  text += str
              self.assertEqual(text, self.TEXT * 5)
  
      def testRead100(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertEqual(bz2f.read(100), self.TEXT[:100])
  
      def testPeek(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              pdata = bz2f.peek()
              self.assertNotEqual(len(pdata), 0)
              self.assertTrue(self.TEXT.startswith(pdata))
              self.assertEqual(bz2f.read(), self.TEXT)
  
      def testReadInto(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              n = 128
              b = bytearray(n)
              self.assertEqual(bz2f.readinto(b), n)
              self.assertEqual(b, self.TEXT[:n])
              n = len(self.TEXT) - n
              b = bytearray(len(self.TEXT))
              self.assertEqual(bz2f.readinto(b), n)
              self.assertEqual(b[:n], self.TEXT[-n:])
  
      def testReadLine(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.readline, None)
              for line in self.TEXT_LINES:
                  self.assertEqual(bz2f.readline(), line)
  
      def testReadLineMultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.readline, None)
              for line in self.TEXT_LINES * 5:
                  self.assertEqual(bz2f.readline(), line)
  
      def testReadLines(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.readlines, None)
              self.assertEqual(bz2f.readlines(), self.TEXT_LINES)
  
      def testReadLinesMultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.readlines, None)
              self.assertEqual(bz2f.readlines(), self.TEXT_LINES * 5)
  
      def testIterator(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertEqual(list(iter(bz2f)), self.TEXT_LINES)
  
      def testIteratorMultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              self.assertEqual(list(iter(bz2f)), self.TEXT_LINES * 5)
  
      def testClosedIteratorDeadlock(self):
          # Issue #3309: Iteration on a closed BZ2File should release the lock.
          self.createTempFile()
          bz2f = BZ2File(self.filename)
          bz2f.close()
          self.assertRaises(ValueError, next, bz2f)
          # This call will deadlock if the above call failed to release the lock.
          self.assertRaises(ValueError, bz2f.readlines)
  
      def testWrite(self):
          with BZ2File(self.filename, "w") as bz2f:
              self.assertRaises(TypeError, bz2f.write)
              bz2f.write(self.TEXT)
          with open(self.filename, 'rb') as f:
              self.assertEqual(ext_decompress(f.read()), self.TEXT)
  
      def testWriteChunks10(self):
          with BZ2File(self.filename, "w") as bz2f:
              n = 0
              while True:
                  str = self.TEXT[n*10:(n+1)*10]
                  if not str:
                      break
                  bz2f.write(str)
                  n += 1
          with open(self.filename, 'rb') as f:
              self.assertEqual(ext_decompress(f.read()), self.TEXT)
  
      def testWriteNonDefaultCompressLevel(self):
          expected = bz2.compress(self.TEXT, compresslevel=5)
          with BZ2File(self.filename, "w", compresslevel=5) as bz2f:
              bz2f.write(self.TEXT)
          with open(self.filename, "rb") as f:
              self.assertEqual(f.read(), expected)
  
      def testWriteLines(self):
          with BZ2File(self.filename, "w") as bz2f:
              self.assertRaises(TypeError, bz2f.writelines)
              bz2f.writelines(self.TEXT_LINES)
          # Issue #1535500: Calling writelines() on a closed BZ2File
          # should raise an exception.
          self.assertRaises(ValueError, bz2f.writelines, ["a"])
          with open(self.filename, 'rb') as f:
              self.assertEqual(ext_decompress(f.read()), self.TEXT)
  
      def testWriteMethodsOnReadOnlyFile(self):
          with BZ2File(self.filename, "w") as bz2f:
              bz2f.write(b"abc")
  
          with BZ2File(self.filename, "r") as bz2f:
              self.assertRaises(OSError, bz2f.write, b"a")
              self.assertRaises(OSError, bz2f.writelines, [b"a"])
  
      def testAppend(self):
          with BZ2File(self.filename, "w") as bz2f:
              self.assertRaises(TypeError, bz2f.write)
              bz2f.write(self.TEXT)
          with BZ2File(self.filename, "a") as bz2f:
              self.assertRaises(TypeError, bz2f.write)
              bz2f.write(self.TEXT)
          with open(self.filename, 'rb') as f:
              self.assertEqual(ext_decompress(f.read()), self.TEXT * 2)
  
      def testSeekForward(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.seek)
              bz2f.seek(150)
              self.assertEqual(bz2f.read(), self.TEXT[150:])
  
      def testSeekForwardAcrossStreams(self):
          self.createTempFile(streams=2)
          with BZ2File(self.filename) as bz2f:
              self.assertRaises(TypeError, bz2f.seek)
              bz2f.seek(len(self.TEXT) + 150)
              self.assertEqual(bz2f.read(), self.TEXT[150:])
  
      def testSeekBackwards(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              bz2f.read(500)
              bz2f.seek(-150, 1)
              self.assertEqual(bz2f.read(), self.TEXT[500-150:])
  
      def testSeekBackwardsAcrossStreams(self):
          self.createTempFile(streams=2)
          with BZ2File(self.filename) as bz2f:
              readto = len(self.TEXT) + 100
              while readto > 0:
                  readto -= len(bz2f.read(readto))
              bz2f.seek(-150, 1)
              self.assertEqual(bz2f.read(), self.TEXT[100-150:] + self.TEXT)
  
      def testSeekBackwardsFromEnd(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(-150, 2)
              self.assertEqual(bz2f.read(), self.TEXT[len(self.TEXT)-150:])
  
      def testSeekBackwardsFromEndAcrossStreams(self):
          self.createTempFile(streams=2)
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(-1000, 2)
              self.assertEqual(bz2f.read(), (self.TEXT * 2)[-1000:])
  
      def testSeekPostEnd(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(150000)
              self.assertEqual(bz2f.tell(), len(self.TEXT))
              self.assertEqual(bz2f.read(), b"")
  
      def testSeekPostEndMultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(150000)
              self.assertEqual(bz2f.tell(), len(self.TEXT) * 5)
              self.assertEqual(bz2f.read(), b"")
  
      def testSeekPostEndTwice(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(150000)
              bz2f.seek(150000)
              self.assertEqual(bz2f.tell(), len(self.TEXT))
              self.assertEqual(bz2f.read(), b"")
  
      def testSeekPostEndTwiceMultiStream(self):
          self.createTempFile(streams=5)
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(150000)
              bz2f.seek(150000)
              self.assertEqual(bz2f.tell(), len(self.TEXT) * 5)
              self.assertEqual(bz2f.read(), b"")
  
      def testSeekPreStart(self):
          self.createTempFile()
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(-150)
              self.assertEqual(bz2f.tell(), 0)
              self.assertEqual(bz2f.read(), self.TEXT)
  
      def testSeekPreStartMultiStream(self):
          self.createTempFile(streams=2)
          with BZ2File(self.filename) as bz2f:
              bz2f.seek(-150)
              self.assertEqual(bz2f.tell(), 0)
              self.assertEqual(bz2f.read(), self.TEXT * 2)
  
      def testFileno(self):
          self.createTempFile()
          with open(self.filename, 'rb') as rawf:
              bz2f = BZ2File(rawf)
              try:
                  self.assertEqual(bz2f.fileno(), rawf.fileno())
              finally:
                  bz2f.close()
          self.assertRaises(ValueError, bz2f.fileno)
  
      def testSeekable(self):
          bz2f = BZ2File(BytesIO(self.DATA))
          try:
              self.assertTrue(bz2f.seekable())
              bz2f.read()
              self.assertTrue(bz2f.seekable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.seekable)
  
          bz2f = BZ2File(BytesIO(), "w")
          try:
              self.assertFalse(bz2f.seekable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.seekable)
  
          src = BytesIO(self.DATA)
          src.seekable = lambda: False
          bz2f = BZ2File(src)
          try:
              self.assertFalse(bz2f.seekable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.seekable)
  
      def testReadable(self):
          bz2f = BZ2File(BytesIO(self.DATA))
          try:
              self.assertTrue(bz2f.readable())
              bz2f.read()
              self.assertTrue(bz2f.readable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.readable)
  
          bz2f = BZ2File(BytesIO(), "w")
          try:
              self.assertFalse(bz2f.readable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.readable)
  
      def testWritable(self):
          bz2f = BZ2File(BytesIO(self.DATA))
          try:
              self.assertFalse(bz2f.writable())
              bz2f.read()
              self.assertFalse(bz2f.writable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.writable)
  
          bz2f = BZ2File(BytesIO(), "w")
          try:
              self.assertTrue(bz2f.writable())
          finally:
              bz2f.close()
          self.assertRaises(ValueError, bz2f.writable)
  
      def testOpenDel(self):
          self.createTempFile()
          for i in range(10000):
              o = BZ2File(self.filename)
              del o
  
      def testOpenNonexistent(self):
          self.assertRaises(OSError, BZ2File, "/non/existent")
  
      def testReadlinesNoNewline(self):
          # Issue #1191043: readlines() fails on a file containing no newline.
          data = b'BZh91AY&SY\xd9b\x89]\x00\x00\x00\x03\x80\x04\x00\x02\x00\x0c\x00 \x00!\x9ah3M\x13<]\xc9\x14\xe1BCe\x8a%t'
          with open(self.filename, "wb") as f:
              f.write(data)
          with BZ2File(self.filename) as bz2f:
              lines = bz2f.readlines()
          self.assertEqual(lines, [b'Test'])
          with BZ2File(self.filename) as bz2f:
              xlines = list(bz2f.readlines())
          self.assertEqual(xlines, [b'Test'])
  
      def testContextProtocol(self):
          f = None
          with BZ2File(self.filename, "wb") as f:
              f.write(b"xxx")
          f = BZ2File(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 BZ2File(self.filename, "wb") as f:
                  1/0
          except ZeroDivisionError:
              pass
          else:
              self.fail("1/0 didn't raise an exception")
  
      def testThreading(self):
          # Issue #7205: Using a BZ2File from several threads shouldn't deadlock.
          data = b"1" * 2**20
          nthreads = 10
          with BZ2File(self.filename, 'wb') as f:
              def comp():
                  for i in range(5):
                      f.write(data)
              threads = [threading.Thread(target=comp) for i in range(nthreads)]
              with threading_helper.start_threads(threads):
                  pass
  
      def testMixedIterationAndReads(self):
          self.createTempFile()
          linelen = len(self.TEXT_LINES[0])
          halflen = linelen // 2
          with BZ2File(self.filename) as bz2f:
              bz2f.read(halflen)
              self.assertEqual(next(bz2f), self.TEXT_LINES[0][halflen:])
              self.assertEqual(bz2f.read(), self.TEXT[linelen:])
          with BZ2File(self.filename) as bz2f:
              bz2f.readline()
              self.assertEqual(next(bz2f), self.TEXT_LINES[1])
              self.assertEqual(bz2f.readline(), self.TEXT_LINES[2])
          with BZ2File(self.filename) as bz2f:
              bz2f.readlines()
              self.assertRaises(StopIteration, next, bz2f)
              self.assertEqual(bz2f.readlines(), [])
  
      def testMultiStreamOrdering(self):
          # Test the ordering of streams when reading a multi-stream archive.
          data1 = b"foo" * 1000
          data2 = b"bar" * 1000
          with BZ2File(self.filename, "w") as bz2f:
              bz2f.write(data1)
          with BZ2File(self.filename, "a") as bz2f:
              bz2f.write(data2)
          with BZ2File(self.filename) as bz2f:
              self.assertEqual(bz2f.read(), data1 + data2)
  
      def testOpenBytesFilename(self):
          str_filename = self.filename
          try:
              bytes_filename = str_filename.encode("ascii")
          except UnicodeEncodeError:
              self.skipTest("Temporary file name needs to be ASCII")
          with BZ2File(bytes_filename, "wb") as f:
              f.write(self.DATA)
          with BZ2File(bytes_filename, "rb") as f:
              self.assertEqual(f.read(), self.DATA)
          # Sanity check that we are actually operating on the right file.
          with BZ2File(str_filename, "rb") as f:
              self.assertEqual(f.read(), self.DATA)
  
      def testOpenPathLikeFilename(self):
          filename = pathlib.Path(self.filename)
          with BZ2File(filename, "wb") as f:
              f.write(self.DATA)
          with BZ2File(filename, "rb") as f:
              self.assertEqual(f.read(), self.DATA)
  
      def testDecompressLimited(self):
          """Decompressed data buffering should be limited"""
          bomb = bz2.compress(b'\0' * int(2e6), compresslevel=9)
          self.assertLess(len(bomb), _compression.BUFFER_SIZE)
  
          decomp = BZ2File(BytesIO(bomb))
          self.assertEqual(decomp.read(1), b'\0')
          max_decomp = 1 + DEFAULT_BUFFER_SIZE
          self.assertLessEqual(decomp._buffer.raw.tell(), max_decomp,
              "Excessive amount of data was decompressed")
  
  
      # Tests for a BZ2File wrapping another file object:
  
      def testReadBytesIO(self):
          with BytesIO(self.DATA) as bio:
              with BZ2File(bio) as bz2f:
                  self.assertRaises(TypeError, bz2f.read, float())
                  self.assertEqual(bz2f.read(), self.TEXT)
              self.assertFalse(bio.closed)
  
      def testPeekBytesIO(self):
          with BytesIO(self.DATA) as bio:
              with BZ2File(bio) as bz2f:
                  pdata = bz2f.peek()
                  self.assertNotEqual(len(pdata), 0)
                  self.assertTrue(self.TEXT.startswith(pdata))
                  self.assertEqual(bz2f.read(), self.TEXT)
  
      def testWriteBytesIO(self):
          with BytesIO() as bio:
              with BZ2File(bio, "w") as bz2f:
                  self.assertRaises(TypeError, bz2f.write)
                  bz2f.write(self.TEXT)
              self.assertEqual(ext_decompress(bio.getvalue()), self.TEXT)
              self.assertFalse(bio.closed)
  
      def testSeekForwardBytesIO(self):
          with BytesIO(self.DATA) as bio:
              with BZ2File(bio) as bz2f:
                  self.assertRaises(TypeError, bz2f.seek)
                  bz2f.seek(150)
                  self.assertEqual(bz2f.read(), self.TEXT[150:])
  
      def testSeekBackwardsBytesIO(self):
          with BytesIO(self.DATA) as bio:
              with BZ2File(bio) as bz2f:
                  bz2f.read(500)
                  bz2f.seek(-150, 1)
                  self.assertEqual(bz2f.read(), self.TEXT[500-150:])
  
      def test_read_truncated(self):
          # Drop the eos_magic field (6 bytes) and CRC (4 bytes).
          truncated = self.DATA[:-10]
          with BZ2File(BytesIO(truncated)) as f:
              self.assertRaises(EOFError, f.read)
          with BZ2File(BytesIO(truncated)) as f:
              self.assertEqual(f.read(len(self.TEXT)), self.TEXT)
              self.assertRaises(EOFError, f.read, 1)
          # Incomplete 4-byte file header, and block header of at least 146 bits.
          for i in range(22):
              with BZ2File(BytesIO(truncated[:i])) as f:
                  self.assertRaises(EOFError, f.read, 1)
  
      def test_issue44439(self):
          q = array.array('Q', [1, 2, 3, 4, 5])
          LENGTH = len(q) * q.itemsize
  
          with BZ2File(BytesIO(), 'w') as f:
              self.assertEqual(f.write(q), LENGTH)
              self.assertEqual(f.tell(), LENGTH)
  
  
  class BZ2CompressorTest(BaseTest):
      def testCompress(self):
          bz2c = BZ2Compressor()
          self.assertRaises(TypeError, bz2c.compress)
          data = bz2c.compress(self.TEXT)
          data += bz2c.flush()
          self.assertEqual(ext_decompress(data), self.TEXT)
  
      def testCompressEmptyString(self):
          bz2c = BZ2Compressor()
          data = bz2c.compress(b'')
          data += bz2c.flush()
          self.assertEqual(data, self.EMPTY_DATA)
  
      def testCompressChunks10(self):
          bz2c = BZ2Compressor()
          n = 0
          data = b''
          while True:
              str = self.TEXT[n*10:(n+1)*10]
              if not str:
                  break
              data += bz2c.compress(str)
              n += 1
          data += bz2c.flush()
          self.assertEqual(ext_decompress(data), self.TEXT)
  
      @support.skip_if_pgo_task
      @bigmemtest(size=_4G + 100, memuse=2)
      def testCompress4G(self, size):
          # "Test BZ2Compressor.compress()/flush() with >4GiB input"
          bz2c = BZ2Compressor()
          data = b"x" * size
          try:
              compressed = bz2c.compress(data)
              compressed += bz2c.flush()
          finally:
              data = None  # Release memory
          data = bz2.decompress(compressed)
          try:
              self.assertEqual(len(data), size)
              self.assertEqual(len(data.strip(b"x")), 0)
          finally:
              data = None
  
      def testPickle(self):
          for proto in range(pickle.HIGHEST_PROTOCOL + 1):
              with self.assertRaises(TypeError):
                  pickle.dumps(BZ2Compressor(), proto)
  
  
  class BZ2DecompressorTest(BaseTest):
      def test_Constructor(self):
          self.assertRaises(TypeError, BZ2Decompressor, 42)
  
      def testDecompress(self):
          bz2d = BZ2Decompressor()
          self.assertRaises(TypeError, bz2d.decompress)
          text = bz2d.decompress(self.DATA)
          self.assertEqual(text, self.TEXT)
  
      def testDecompressChunks10(self):
          bz2d = BZ2Decompressor()
          text = b''
          n = 0
          while True:
              str = self.DATA[n*10:(n+1)*10]
              if not str:
                  break
              text += bz2d.decompress(str)
              n += 1
          self.assertEqual(text, self.TEXT)
  
      def testDecompressUnusedData(self):
          bz2d = BZ2Decompressor()
          unused_data = b"this is unused data"
          text = bz2d.decompress(self.DATA+unused_data)
          self.assertEqual(text, self.TEXT)
          self.assertEqual(bz2d.unused_data, unused_data)
  
      def testEOFError(self):
          bz2d = BZ2Decompressor()
          text = bz2d.decompress(self.DATA)
          self.assertRaises(EOFError, bz2d.decompress, b"anything")
          self.assertRaises(EOFError, bz2d.decompress, b"")
  
      @support.skip_if_pgo_task
      @bigmemtest(size=_4G + 100, memuse=3.3)
      def testDecompress4G(self, size):
          # "Test BZ2Decompressor.decompress() with >4GiB input"
          blocksize = 10 * 1024 * 1024
          block = random.randbytes(blocksize)
          try:
              data = block * (size // blocksize + 1)
              compressed = bz2.compress(data)
              bz2d = BZ2Decompressor()
              decompressed = bz2d.decompress(compressed)
              self.assertTrue(decompressed == data)
          finally:
              data = None
              compressed = None
              decompressed = None
  
      def testPickle(self):
          for proto in range(pickle.HIGHEST_PROTOCOL + 1):
              with self.assertRaises(TypeError):
                  pickle.dumps(BZ2Decompressor(), proto)
  
      def testDecompressorChunksMaxsize(self):
          bzd = BZ2Decompressor()
          max_length = 100
          out = []
  
          # Feed some input
          len_ = len(self.BIG_DATA) - 64
          out.append(bzd.decompress(self.BIG_DATA[:len_],
                                    max_length=max_length))
          self.assertFalse(bzd.needs_input)
          self.assertEqual(len(out[-1]), max_length)
  
          # Retrieve more data without providing more input
          out.append(bzd.decompress(b'', max_length=max_length))
          self.assertFalse(bzd.needs_input)
          self.assertEqual(len(out[-1]), max_length)
  
          # Retrieve more data while providing more input
          out.append(bzd.decompress(self.BIG_DATA[len_:],
                                    max_length=max_length))
          self.assertLessEqual(len(out[-1]), max_length)
  
          # Retrieve remaining uncompressed data
          while not bzd.eof:
              out.append(bzd.decompress(b'', max_length=max_length))
              self.assertLessEqual(len(out[-1]), max_length)
  
          out = b"".join(out)
          self.assertEqual(out, self.BIG_TEXT)
          self.assertEqual(bzd.unused_data, b"")
  
      def test_decompressor_inputbuf_1(self):
          # Test reusing input buffer after moving existing
          # contents to beginning
          bzd = BZ2Decompressor()
          out = []
  
          # Create input buffer and fill it
          self.assertEqual(bzd.decompress(self.DATA[:100],
                                          max_length=0), b'')
  
          # Retrieve some results, freeing capacity at beginning
          # of input buffer
          out.append(bzd.decompress(b'', 2))
  
          # Add more data that fits into input buffer after
          # moving existing data to beginning
          out.append(bzd.decompress(self.DATA[100:105], 15))
  
          # Decompress rest of data
          out.append(bzd.decompress(self.DATA[105:]))
          self.assertEqual(b''.join(out), self.TEXT)
  
      def test_decompressor_inputbuf_2(self):
          # Test reusing input buffer by appending data at the
          # end right away
          bzd = BZ2Decompressor()
          out = []
  
          # Create input buffer and empty it
          self.assertEqual(bzd.decompress(self.DATA[:200],
                                          max_length=0), b'')
          out.append(bzd.decompress(b''))
  
          # Fill buffer with new data
          out.append(bzd.decompress(self.DATA[200:280], 2))
  
          # Append some more data, not enough to require resize
          out.append(bzd.decompress(self.DATA[280:300], 2))
  
          # Decompress rest of data
          out.append(bzd.decompress(self.DATA[300:]))
          self.assertEqual(b''.join(out), self.TEXT)
  
      def test_decompressor_inputbuf_3(self):
          # Test reusing input buffer after extending it
  
          bzd = BZ2Decompressor()
          out = []
  
          # Create almost full input buffer
          out.append(bzd.decompress(self.DATA[:200], 5))
  
          # Add even more data to it, requiring resize
          out.append(bzd.decompress(self.DATA[200:300], 5))
  
          # Decompress rest of data
          out.append(bzd.decompress(self.DATA[300:]))
          self.assertEqual(b''.join(out), self.TEXT)
  
      def test_failure(self):
          bzd = BZ2Decompressor()
          self.assertRaises(Exception, bzd.decompress, self.BAD_DATA * 30)
          # Previously, a second call could crash due to internal inconsistency
          self.assertRaises(Exception, bzd.decompress, self.BAD_DATA * 30)
  
      @support.refcount_test
      def test_refleaks_in___init__(self):
          gettotalrefcount = support.get_attribute(sys, 'gettotalrefcount')
          bzd = BZ2Decompressor()
          refs_before = gettotalrefcount()
          for i in range(100):
              bzd.__init__()
          self.assertAlmostEqual(gettotalrefcount() - refs_before, 0, delta=10)
  
  
  class CompressDecompressTest(BaseTest):
      def testCompress(self):
          data = bz2.compress(self.TEXT)
          self.assertEqual(ext_decompress(data), self.TEXT)
  
      def testCompressEmptyString(self):
          text = bz2.compress(b'')
          self.assertEqual(text, self.EMPTY_DATA)
  
      def testDecompress(self):
          text = bz2.decompress(self.DATA)
          self.assertEqual(text, self.TEXT)
  
      def testDecompressEmpty(self):
          text = bz2.decompress(b"")
          self.assertEqual(text, b"")
  
      def testDecompressToEmptyString(self):
          text = bz2.decompress(self.EMPTY_DATA)
          self.assertEqual(text, b'')
  
      def testDecompressIncomplete(self):
          self.assertRaises(ValueError, bz2.decompress, self.DATA[:-10])
  
      def testDecompressBadData(self):
          self.assertRaises(OSError, bz2.decompress, self.BAD_DATA)
  
      def testDecompressMultiStream(self):
          text = bz2.decompress(self.DATA * 5)
          self.assertEqual(text, self.TEXT * 5)
  
      def testDecompressTrailingJunk(self):
          text = bz2.decompress(self.DATA + self.BAD_DATA)
          self.assertEqual(text, self.TEXT)
  
      def testDecompressMultiStreamTrailingJunk(self):
          text = bz2.decompress(self.DATA * 5 + self.BAD_DATA)
          self.assertEqual(text, self.TEXT * 5)
  
  
  class OpenTest(BaseTest):
      "Test the open function."
  
      def open(self, *args, **kwargs):
          return bz2.open(*args, **kwargs)
  
      def test_binary_modes(self):
          for mode in ("wb", "xb"):
              if mode == "xb":
                  unlink(self.filename)
              with self.open(self.filename, mode) as f:
                  f.write(self.TEXT)
              with open(self.filename, "rb") as f:
                  file_data = ext_decompress(f.read())
                  self.assertEqual(file_data, self.TEXT)
              with self.open(self.filename, "rb") as f:
                  self.assertEqual(f.read(), self.TEXT)
              with self.open(self.filename, "ab") as f:
                  f.write(self.TEXT)
              with open(self.filename, "rb") as f:
                  file_data = ext_decompress(f.read())
                  self.assertEqual(file_data, self.TEXT * 2)
  
      def test_implicit_binary_modes(self):
          # Test implicit binary modes (no "b" or "t" in mode string).
          for mode in ("w", "x"):
              if mode == "x":
                  unlink(self.filename)
              with self.open(self.filename, mode) as f:
                  f.write(self.TEXT)
              with open(self.filename, "rb") as f:
                  file_data = ext_decompress(f.read())
                  self.assertEqual(file_data, self.TEXT)
              with self.open(self.filename, "r") as f:
                  self.assertEqual(f.read(), self.TEXT)
              with self.open(self.filename, "a") as f:
                  f.write(self.TEXT)
              with open(self.filename, "rb") as f:
                  file_data = ext_decompress(f.read())
                  self.assertEqual(file_data, self.TEXT * 2)
  
      def test_text_modes(self):
          text = self.TEXT.decode("ascii")
          text_native_eol = text.replace("\n", os.linesep)
          for mode in ("wt", "xt"):
              if mode == "xt":
                  unlink(self.filename)
              with self.open(self.filename, mode, encoding="ascii") as f:
                  f.write(text)
              with open(self.filename, "rb") as f:
                  file_data = ext_decompress(f.read()).decode("ascii")
                  self.assertEqual(file_data, text_native_eol)
              with self.open(self.filename, "rt", encoding="ascii") as f:
                  self.assertEqual(f.read(), text)
              with self.open(self.filename, "at", encoding="ascii") as f:
                  f.write(text)
              with open(self.filename, "rb") as f:
                  file_data = ext_decompress(f.read()).decode("ascii")
                  self.assertEqual(file_data, text_native_eol * 2)
  
      def test_x_mode(self):
          for mode in ("x", "xb", "xt"):
              unlink(self.filename)
              encoding = "utf-8" if "t" in mode else None
              with self.open(self.filename, mode, encoding=encoding) as f:
                  pass
              with self.assertRaises(FileExistsError):
                  with self.open(self.filename, mode) as f:
                      pass
  
      def test_fileobj(self):
          with self.open(BytesIO(self.DATA), "r") as f:
              self.assertEqual(f.read(), self.TEXT)
          with self.open(BytesIO(self.DATA), "rb") as f:
              self.assertEqual(f.read(), self.TEXT)
          text = self.TEXT.decode("ascii")
          with self.open(BytesIO(self.DATA), "rt", encoding="utf-8") as f:
              self.assertEqual(f.read(), text)
  
      def test_bad_params(self):
          # Test invalid parameter combinations.
          self.assertRaises(ValueError,
                            self.open, self.filename, "wbt")
          self.assertRaises(ValueError,
                            self.open, self.filename, "xbt")
          self.assertRaises(ValueError,
                            self.open, self.filename, "rb", encoding="utf-8")
          self.assertRaises(ValueError,
                            self.open, self.filename, "rb", errors="ignore")
          self.assertRaises(ValueError,
                            self.open, self.filename, "rb", newline="\n")
  
      def test_encoding(self):
          # Test non-default encoding.
          text = self.TEXT.decode("ascii")
          text_native_eol = text.replace("\n", os.linesep)
          with self.open(self.filename, "wt", encoding="utf-16-le") as f:
              f.write(text)
          with open(self.filename, "rb") as f:
              file_data = ext_decompress(f.read()).decode("utf-16-le")
              self.assertEqual(file_data, text_native_eol)
          with self.open(self.filename, "rt", encoding="utf-16-le") as f:
              self.assertEqual(f.read(), text)
  
      def test_encoding_error_handler(self):
          # Test with non-default encoding error handler.
          with self.open(self.filename, "wb") as f:
              f.write(b"foo\xffbar")
          with self.open(self.filename, "rt", encoding="ascii", errors="ignore") \
                  as f:
              self.assertEqual(f.read(), "foobar")
  
      def test_newline(self):
          # Test with explicit newline (universal newline mode disabled).
          text = self.TEXT.decode("ascii")
          with self.open(self.filename, "wt", encoding="utf-8", newline="\n") as f:
              f.write(text)
          with self.open(self.filename, "rt", encoding="utf-8", newline="\r") as f:
              self.assertEqual(f.readlines(), [text])
  
  
  def tearDownModule():
      support.reap_children()
  
  
  if __name__ == '__main__':
      unittest.main()
  