diff --git a/internal_filesystem/apps/com.example.appstore/assets/appstore.py b/internal_filesystem/apps/com.example.appstore/assets/appstore.py
index 65475830..c7c7610c 100644
--- a/internal_filesystem/apps/com.example.appstore/assets/appstore.py
+++ b/internal_filesystem/apps/com.example.appstore/assets/appstore.py
@@ -66,6 +66,7 @@ def download_and_unzip(zip_url, dest_folder="/apps"):
         os.stat(temp_zip_path)
         print(f"Stat says: {os.stat(temp_zip_path)}")
         with zipfile.ZipFile(temp_zip_path, "r") as zip_ref:
+            print("extracting...")
             zip_ref.extractall(dest_folder)
         print("Unzipped successfully")
         # Step 3: Clean up
diff --git a/internal_filesystem/lib/zipfile.py b/internal_filesystem/lib/zipfile.py
new file mode 100644
index 00000000..bd4a06e5
--- /dev/null
+++ b/internal_filesystem/lib/zipfile.py
@@ -0,0 +1,2210 @@
+"""
+Read and write ZIP files.
+
+MicroPython implementation ported from CPython 3.12
+https://raw.githubusercontent.com/python/cpython/3.12/Lib/zipfile/__init__.py
+
+PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
+"""
+import binascii
+import io
+import os
+
+if hasattr(io, 'UnsupportedOperation'):
+    UnsupportedOperation = io.UnsupportedOperation
+else:
+    class UnsupportedOperation(OSError):
+        pass
+
+try:
+    import stat
+except ImportError:
+    pass
+
+import struct
+import sys
+
+import time
+
+SEEK_SET = 0
+SEEK_CUR = 1
+SEEK_END = 2
+
+CURDIR = '.' # os.path.curdir
+PARDIR = '..' # os.path.pardir
+ALTSEP = '/'
+
+is_cpython = sys.implementation.name != 'micropython'
+
+if is_cpython:
+    # CPython
+    from io import BufferedIOBase
+    from threading import RLock
+    from shutil import copyfileobj
+    from os import PathLike
+    from struct import Struct
+
+    os_stat = os.stat
+    from os import fspath, makedirs
+    os_path_splitdrive = os.path.splitdrive
+    
+    def warn(s, stacklevel=None):
+        import warnings
+        warnings.warn(s, stacklevel=stacklevel)
+
+    struct_error = struct.error
+
+else:
+    # MicroPython
+
+    # Dummy base class
+    class BufferedIOBase():
+        def __init__(self):
+            self.closed = False
+
+        def close(self):
+            self.closed = True
+
+        def __enter__(self):
+            return self
+
+        def __exit__(self, type, value, traceback):
+            self.close()
+
+    # Dummy lock - does nothing
+    class RLock():
+
+        def __enter__(self):
+            return self
+
+        def __exit__(self, type, value, traceback):
+            pass
+
+    def copyfileobj(fsrc, fdst, length=0):
+        """copy data from file-like object fsrc to file-like object fdst"""
+        if not length:
+            length = 1 * 1024
+        while True:
+            buf = fsrc.read(length)
+            if not buf:
+                break
+            fdst.write(buf)
+
+    # FIXME: map to pathlib.Path
+    class PathLike(object):
+        pass
+    
+    class Struct():
+        def __init__(self, format):
+            self.format = format
+
+        def pack(self, *args):
+            return struct.pack(self.format, *args)
+
+        def unpack(self, buffer):
+            return struct.unpack(self.format, buffer)
+
+    from collections import namedtuple
+    _stat_namedtuple = namedtuple("usage", ("st_mode", "st_ino", "st_dev", "st_nlink", "st_uid", "st_gid", "st_size", "st_atime", "st_mtime", "st_ctime"))
+
+    def os_stat(path):
+        tpl = os.stat(path)
+        out = _stat_namedtuple(*tpl)
+        return out
+
+    def fspath(path):
+        # TODO: support PathLike objects
+        return path
+
+    def makedirs(path):
+        parts = path.split(OS_SEP)
+        for i in range(1, len(parts)+1):
+            sub = parts[0:i]
+            p = OS_SEP.join(sub)
+            if not os.path.exists(p):
+                os.mkdir(p)
+
+    def os_path_splitdrive(p):
+        """Split a pathname into drive and path. On Posix, drive is always empty."""
+        p = fspath(p)
+        return p[:0], p
+
+    class UserWarning(Exception):
+        pass
+
+    def warn(s, stacklevel=None):
+        print('WARNING', s)
+        raise UserWarning(s)
+
+    struct_error = ValueError
+
+    UnicodeDecodeError = UnicodeError
+
+OS_SEP = os.sep if hasattr(os, 'sep') else '/'
+OS_PATH_SEP = OS_SEP
+
+
+try:
+    import zlib # We may need its compression method
+    crc32 = zlib.crc32
+except ImportError:
+    zlib = None
+    crc32 = binascii.crc32
+
+try:
+    import bz2 # We may need its compression method
+except ImportError:
+    bz2 = None
+
+try:
+    import lzma # We may need its compression method
+except ImportError:
+    lzma = None
+
+try:
+    import deflate # We may need its compression method
+except ImportError:
+    deflate = None
+
+__all__ = ["BadZipFile", "BadZipfile", "error",
+           "ZIP_STORED", "ZIP_DEFLATED", "ZIP_BZIP2", "ZIP_LZMA",
+           "is_zipfile", "ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile",
+           ]
+
+class BadZipFile(Exception):
+    pass
+
+
+class LargeZipFile(Exception):
+    """
+    Raised when writing a zipfile, the zipfile requires ZIP64 extensions
+    and those extensions are disabled.
+    """
+
+error = BadZipfile = BadZipFile      # Pre-3.2 compatibility names
+
+
+ZIP64_LIMIT = (1 << 31) - 1
+ZIP_FILECOUNT_LIMIT = (1 << 16) - 1
+ZIP_MAX_COMMENT = (1 << 16) - 1
+
+# constants for Zip file compression methods
+ZIP_STORED = 0
+ZIP_DEFLATED = 8
+ZIP_BZIP2 = 12
+ZIP_LZMA = 14
+# Other ZIP compression methods not supported
+
+DEFAULT_VERSION = 20
+ZIP64_VERSION = 45
+BZIP2_VERSION = 46
+LZMA_VERSION = 63
+# we recognize (but not necessarily support) all features up to that version
+MAX_EXTRACT_VERSION = 63
+
+# Below are some formats and associated data for reading/writing headers using
+# the struct module.  The names and structures of headers/records are those used
+# in the PKWARE description of the ZIP file format:
+#     http://www.pkware.com/documents/casestudies/APPNOTE.TXT
+# (URL valid as of January 2008)
+
+# The "end of central directory" structure, magic number, size, and indices
+# (section V.I in the format document)
+structEndArchive = b"<4s4H2LH"
+stringEndArchive = b"PK\005\006"
+sizeEndCentDir = struct.calcsize(structEndArchive)
+
+_ECD_SIGNATURE = 0
+_ECD_DISK_NUMBER = 1
+_ECD_DISK_START = 2
+_ECD_ENTRIES_THIS_DISK = 3
+_ECD_ENTRIES_TOTAL = 4
+_ECD_SIZE = 5
+_ECD_OFFSET = 6
+_ECD_COMMENT_SIZE = 7
+# These last two indices are not part of the structure as defined in the
+# spec, but they are used internally by this module as a convenience
+_ECD_COMMENT = 8
+_ECD_LOCATION = 9
+
+# The "central directory" structure, magic number, size, and indices
+# of entries in the structure (section V.F in the format document)
+structCentralDir = "<4s4B4HL2L5H2L"
+stringCentralDir = b"PK\001\002"
+sizeCentralDir = struct.calcsize(structCentralDir)
+
+# indexes of entries in the central directory structure
+_CD_SIGNATURE = 0
+_CD_CREATE_VERSION = 1
+_CD_CREATE_SYSTEM = 2
+_CD_EXTRACT_VERSION = 3
+_CD_EXTRACT_SYSTEM = 4
+_CD_FLAG_BITS = 5
+_CD_COMPRESS_TYPE = 6
+_CD_TIME = 7
+_CD_DATE = 8
+_CD_CRC = 9
+_CD_COMPRESSED_SIZE = 10
+_CD_UNCOMPRESSED_SIZE = 11
+_CD_FILENAME_LENGTH = 12
+_CD_EXTRA_FIELD_LENGTH = 13
+_CD_COMMENT_LENGTH = 14
+_CD_DISK_NUMBER_START = 15
+_CD_INTERNAL_FILE_ATTRIBUTES = 16
+_CD_EXTERNAL_FILE_ATTRIBUTES = 17
+_CD_LOCAL_HEADER_OFFSET = 18
+
+# General purpose bit flags
+# Zip Appnote: 4.4.4 general purpose bit flag: (2 bytes)
+_MASK_ENCRYPTED = 1 << 0
+# Bits 1 and 2 have different meanings depending on the compression used.
+_MASK_COMPRESS_OPTION_1 = 1 << 1
+# _MASK_COMPRESS_OPTION_2 = 1 << 2
+# _MASK_USE_DATA_DESCRIPTOR: If set, crc-32, compressed size and uncompressed
+# size are zero in the local header and the real values are written in the data
+# descriptor immediately following the compressed data.
+_MASK_USE_DATA_DESCRIPTOR = 1 << 3
+# Bit 4: Reserved for use with compression method 8, for enhanced deflating.
+# _MASK_RESERVED_BIT_4 = 1 << 4
+_MASK_COMPRESSED_PATCH = 1 << 5
+_MASK_STRONG_ENCRYPTION = 1 << 6
+# _MASK_UNUSED_BIT_7 = 1 << 7
+# _MASK_UNUSED_BIT_8 = 1 << 8
+# _MASK_UNUSED_BIT_9 = 1 << 9
+# _MASK_UNUSED_BIT_10 = 1 << 10
+_MASK_UTF_FILENAME = 1 << 11
+# Bit 12: Reserved by PKWARE for enhanced compression.
+# _MASK_RESERVED_BIT_12 = 1 << 12
+# _MASK_ENCRYPTED_CENTRAL_DIR = 1 << 13
+# Bit 14, 15: Reserved by PKWARE
+# _MASK_RESERVED_BIT_14 = 1 << 14
+# _MASK_RESERVED_BIT_15 = 1 << 15
+
+# The "local file header" structure, magic number, size, and indices
+# (section V.A in the format document)
+structFileHeader = "<4s2B4HL2L2H"
+stringFileHeader = b"PK\003\004"
+sizeFileHeader = struct.calcsize(structFileHeader)
+
+_FH_SIGNATURE = 0
+_FH_EXTRACT_VERSION = 1
+_FH_EXTRACT_SYSTEM = 2
+_FH_GENERAL_PURPOSE_FLAG_BITS = 3
+_FH_COMPRESSION_METHOD = 4
+_FH_LAST_MOD_TIME = 5
+_FH_LAST_MOD_DATE = 6
+_FH_CRC = 7
+_FH_COMPRESSED_SIZE = 8
+_FH_UNCOMPRESSED_SIZE = 9
+_FH_FILENAME_LENGTH = 10
+_FH_EXTRA_FIELD_LENGTH = 11
+
+# The "Zip64 end of central directory locator" structure, magic number, and size
+structEndArchive64Locator = "<4sLQL"
+stringEndArchive64Locator = b"PK\x06\x07"
+sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator)
+
+# The "Zip64 end of central directory" record, magic number, size, and indices
+# (section V.G in the format document)
+structEndArchive64 = "<4sQ2H2L4Q"
+stringEndArchive64 = b"PK\x06\x06"
+sizeEndCentDir64 = struct.calcsize(structEndArchive64)
+
+_CD64_SIGNATURE = 0
+_CD64_DIRECTORY_RECSIZE = 1
+_CD64_CREATE_VERSION = 2
+_CD64_EXTRACT_VERSION = 3
+_CD64_DISK_NUMBER = 4
+_CD64_DISK_NUMBER_START = 5
+_CD64_NUMBER_ENTRIES_THIS_DISK = 6
+_CD64_NUMBER_ENTRIES_TOTAL = 7
+_CD64_DIRECTORY_SIZE = 8
+_CD64_OFFSET_START_CENTDIR = 9
+
+_DD_SIGNATURE = 0x08074b50
+
+
+def _strip_extra(extra, xids):
+    # Remove Extra Fields with specified IDs.
+    _EXTRA_FIELD_STRUCT = Struct('<HH')
+    unpack = _EXTRA_FIELD_STRUCT.unpack
+    modified = False
+    buffer = []
+    start = i = 0
+    while i + 4 <= len(extra):
+        xid, xlen = unpack(extra[i : i + 4])
+        j = i + 4 + xlen
+        if xid in xids:
+            if i != start:
+                buffer.append(extra[start : i])
+            start = j
+            modified = True
+        i = j
+    if not modified:
+        return extra
+    if start != len(extra):
+        buffer.append(extra[start:])
+    return b''.join(buffer)
+
+def _check_zipfile(fp):
+    try:
+        if _EndRecData(fp):
+            return True         # file has correct magic number
+    except OSError:
+        pass
+    return False
+
+def is_zipfile(filename):
+    """Quickly see if a file is a ZIP file by checking the magic number.
+
+    The filename argument may be a file or file-like object too.
+    """
+    result = False
+    try:
+        if hasattr(filename, "read"):
+            result = _check_zipfile(fp=filename)
+        else:
+            with open(filename, "rb") as fp:
+                result = _check_zipfile(fp)
+    except OSError:
+        pass
+    return result
+
+def _EndRecData64(fpin, offset, endrec):
+    """
+    Read the ZIP64 end-of-archive records and use that to update endrec
+    """
+    try:
+        fpin.seek(offset - sizeEndCentDir64Locator, 2)
+    except OSError:
+        # If the seek fails, the file is not large enough to contain a ZIP64
+        # end-of-archive record, so just return the end record we were given.
+        return endrec
+
+    data = fpin.read(sizeEndCentDir64Locator)
+    if len(data) != sizeEndCentDir64Locator:
+        return endrec
+    sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data)
+    if sig != stringEndArchive64Locator:
+        return endrec
+
+    if diskno != 0 or disks > 1:
+        raise BadZipFile("zipfiles that span multiple disks are not supported")
+
+    # Assume no 'zip64 extensible data'
+    fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2)
+    data = fpin.read(sizeEndCentDir64)
+    if len(data) != sizeEndCentDir64:
+        return endrec
+    sig, sz, create_version, read_version, disk_num, disk_dir, \
+        dircount, dircount2, dirsize, diroffset = \
+        struct.unpack(structEndArchive64, data)
+    if sig != stringEndArchive64:
+        return endrec
+
+    # Update the original endrec using data from the ZIP64 record
+    endrec[_ECD_SIGNATURE] = sig
+    endrec[_ECD_DISK_NUMBER] = disk_num
+    endrec[_ECD_DISK_START] = disk_dir
+    endrec[_ECD_ENTRIES_THIS_DISK] = dircount
+    endrec[_ECD_ENTRIES_TOTAL] = dircount2
+    endrec[_ECD_SIZE] = dirsize
+    endrec[_ECD_OFFSET] = diroffset
+    return endrec
+
+
+def _EndRecData(fpin):
+    """Return data from the "End of Central Directory" record, or None.
+
+    The data is a list of the nine items in the ZIP "End of central dir"
+    record followed by a tenth item, the file seek offset of this record."""
+
+    # Determine file size
+    fpin.seek(0, 2)
+    filesize = fpin.tell()
+
+    # Check to see if this is ZIP file with no archive comment (the
+    # "end of central directory" structure should be the last item in the
+    # file if this is the case).
+    try:
+        fpin.seek(-sizeEndCentDir, 2)
+    except OSError:
+        return None
+    data = fpin.read()
+    if (len(data) == sizeEndCentDir and
+        data[0:4] == stringEndArchive and
+        data[-2:] == b"\000\000"):
+        # the signature is correct and there's no comment, unpack structure
+        endrec = struct.unpack(structEndArchive, data)
+        endrec=list(endrec)
+
+        # Append a blank comment and record start offset
+        endrec.append(b"")
+        endrec.append(filesize - sizeEndCentDir)
+
+        # Try to read the "Zip64 end of central directory" structure
+        return _EndRecData64(fpin, -sizeEndCentDir, endrec)
+
+    # Either this is not a ZIP file, or it is a ZIP file with an archive
+    # comment.  Search the end of the file for the "end of central directory"
+    # record signature. The comment is the last item in the ZIP file and may be
+    # up to 64K long.  It is assumed that the "end of central directory" magic
+    # number does not appear in the comment.
+    maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0)
+    fpin.seek(maxCommentStart, 0)
+    data = fpin.read()
+    start = data.rfind(stringEndArchive)
+    if start >= 0:
+        # found the magic number; attempt to unpack and interpret
+        recData = data[start:start+sizeEndCentDir]
+        if len(recData) != sizeEndCentDir:
+            # Zip file is corrupted.
+            return None
+        endrec = list(struct.unpack(structEndArchive, recData))
+        commentSize = endrec[_ECD_COMMENT_SIZE] #as claimed by the zip file
+        comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize]
+        endrec.append(comment)
+        endrec.append(maxCommentStart + start)
+
+        # Try to read the "Zip64 end of central directory" structure
+        return _EndRecData64(fpin, maxCommentStart + start - filesize,
+                             endrec)
+
+    # Unable to find a valid end of central directory structure
+    return None
+
+def _sanitize_filename(filename):
+    """Terminate the file name at the first null byte and
+    ensure paths always use forward slashes as the directory separator."""
+
+    # Terminate the file name at the first null byte.  Null bytes in file
+    # names are used as tricks by viruses in archives.
+    null_byte = filename.find(chr(0))
+    if null_byte >= 0:
+        filename = filename[0:null_byte]
+    # This is used to ensure paths in generated ZIP files always use
+    # forward slashes as the directory separator, as required by the
+    # ZIP format specification.
+    if OS_SEP != "/" and OS_SEP in filename:
+        filename = filename.replace(OS_SEP, "/")
+    if ALTSEP and ALTSEP != "/" and ALTSEP in filename:
+        filename = filename.replace(ALTSEP, "/")
+    return filename
+
+
+class ZipInfo (object):
+    """Class with attributes describing each file in the ZIP archive."""
+
+    __slots__ = (
+        'orig_filename',
+        'filename',
+        'date_time',
+        'compress_type',
+        '_compresslevel',
+        'comment',
+        'extra',
+        'create_system',
+        'create_version',
+        'extract_version',
+        'reserved',
+        'flag_bits',
+        'volume',
+        'internal_attr',
+        'external_attr',
+        'header_offset',
+        'CRC',
+        'compress_size',
+        'file_size',
+        '_raw_time',
+        '_end_offset',
+    )
+
+    def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
+        self.orig_filename = filename   # Original file name in archive
+
+        # Terminate the file name at the first null byte and
+        # ensure paths always use forward slashes as the directory separator.
+        filename = _sanitize_filename(filename)
+
+        self.filename = filename        # Normalized file name
+        self.date_time = date_time      # year, month, day, hour, min, sec
+
+        if date_time[0] < 1980:
+            raise ValueError('ZIP does not support timestamps before 1980')
+
+        # Standard values:
+        self.compress_type = ZIP_STORED # Type of compression for the file
+        self._compresslevel = None      # Level for the compressor
+        self.comment = b""              # Comment for each file
+        self.extra = b""                # ZIP extra data
+        if sys.platform == 'win32':
+            self.create_system = 0          # System which created ZIP archive
+        else:
+            # Assume everything else is unix-y
+            self.create_system = 3          # System which created ZIP archive
+        self.create_version = DEFAULT_VERSION  # Version which created ZIP archive
+        self.extract_version = DEFAULT_VERSION # Version needed to extract archive
+        self.reserved = 0               # Must be zero
+        self.flag_bits = 0              # ZIP flag bits
+        self.volume = 0                 # Volume number of file header
+        self.internal_attr = 0          # Internal attributes
+        self.external_attr = 0          # External file attributes
+        self.compress_size = 0          # Size of the compressed file
+        self.file_size = 0              # Size of the uncompressed file
+        self._end_offset = None         # Start of the next local header or central directory
+        # Other attributes are set by class ZipFile:
+        # header_offset         Byte offset to the file header
+        # CRC                   CRC-32 of the uncompressed file
+
+    def __repr__(self):
+        result = ['<%s filename=%r' % (self.__class__.__name__, self.filename)]
+        if self.compress_type != ZIP_STORED:
+            result.append(' compress_type=%s' %
+                          compressor_names.get(self.compress_type,
+                                               self.compress_type))
+        hi = self.external_attr >> 16
+        lo = self.external_attr & 0xFFFF
+        if hi:
+            result.append(' filemode=%r' % stat.filemode(hi))
+        if lo:
+            result.append(' external_attr=%#x' % lo)
+        isdir = self.is_dir()
+        if not isdir or self.file_size:
+            result.append(' file_size=%r' % self.file_size)
+        if ((not isdir or self.compress_size) and
+            (self.compress_type != ZIP_STORED or
+             self.file_size != self.compress_size)):
+            result.append(' compress_size=%r' % self.compress_size)
+        result.append('>')
+        return ''.join(result)
+
+    def FileHeader(self, zip64=None):
+        """Return the per-file header as a bytes object.
+
+        When the optional zip64 arg is None rather than a bool, we will
+        decide based upon the file_size and compress_size, if known,
+        False otherwise.
+        """
+        dt = self.date_time
+        dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
+        dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
+        if self.flag_bits & _MASK_USE_DATA_DESCRIPTOR:
+            # Set these to zero because we write them after the file data
+            CRC = compress_size = file_size = 0
+        else:
+            CRC = self.CRC
+            compress_size = self.compress_size
+            file_size = self.file_size
+
+        extra = self.extra
+
+        min_version = 0
+        if zip64 is None:
+            # We always explicitly pass zip64 within this module.... This
+            # remains for anyone using ZipInfo.FileHeader as a public API.
+            zip64 = file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT
+        if zip64:
+            fmt = '<HHQQ'
+            extra = extra + struct.pack(fmt,
+                                        1, struct.calcsize(fmt)-4, file_size, compress_size)
+            file_size = 0xffffffff
+            compress_size = 0xffffffff
+            min_version = ZIP64_VERSION
+
+        if self.compress_type == ZIP_BZIP2:
+            min_version = max(BZIP2_VERSION, min_version)
+        elif self.compress_type == ZIP_LZMA:
+            min_version = max(LZMA_VERSION, min_version)
+
+        self.extract_version = max(min_version, self.extract_version)
+        self.create_version = max(min_version, self.create_version)
+        filename, flag_bits = self._encodeFilenameFlags()
+        header = struct.pack(structFileHeader, stringFileHeader,
+                             self.extract_version, self.reserved, flag_bits,
+                             self.compress_type, dostime, dosdate, CRC,
+                             compress_size, file_size,
+                             len(filename), len(extra))
+        return header + filename + extra
+
+    def _encodeFilenameFlags(self):
+        try:
+            return self.filename.encode('ascii'), self.flag_bits
+        except UnicodeEncodeError:
+            return self.filename.encode('utf-8'), self.flag_bits | _MASK_UTF_FILENAME
+
+    def _decodeExtra(self, filename_crc):
+        # Try to decode the extra field.
+        extra = self.extra
+        unpack = struct.unpack
+        while len(extra) >= 4:
+            tp, ln = unpack('<HH', extra[:4])
+            if ln+4 > len(extra):
+                raise BadZipFile("Corrupt extra field %04x (size=%d)" % (tp, ln))
+            if tp == 0x0001:
+                data = extra[4:ln+4]
+                # ZIP64 extension (large files and/or large archives)
+                try:
+                    if self.file_size in (0xFFFF_FFFF_FFFF_FFFF, 0xFFFF_FFFF):
+                        field = "File size"
+                        self.file_size, = unpack('<Q', data[:8])
+                        data = data[8:]
+                    if self.compress_size == 0xFFFF_FFFF:
+                        field = "Compress size"
+                        self.compress_size, = unpack('<Q', data[:8])
+                        data = data[8:]
+                    if self.header_offset == 0xFFFF_FFFF:
+                        field = "Header offset"
+                        self.header_offset, = unpack('<Q', data[:8])
+                except struct_error:
+                    raise BadZipFile(f"Corrupt zip64 extra field. \n {field} not found.")
+            elif tp == 0x7075:
+                data = extra[4:ln+4]
+                # Unicode Path Extra Field
+                try:
+                    up_version, up_name_crc = unpack('<BL', data[:5])
+                    if up_version == 1 and up_name_crc == filename_crc:
+                        up_unicode_name = data[5:].decode('utf-8')
+                        if up_unicode_name:
+                            self.filename = _sanitize_filename(up_unicode_name)
+                        else:
+                            warn("Empty unicode path extra field (0x7075)", stacklevel=2)
+                except struct_error as e:
+                    raise BadZipFile("Corrupt unicode path extra field (0x7075)") from e
+                except UnicodeDecodeError as e:
+                    raise BadZipFile('Corrupt unicode path extra field (0x7075): invalid utf-8 bytes') from e
+
+            extra = extra[ln+4:]
+
+    @classmethod
+    def from_file(cls, filename, arcname=None, *, strict_timestamps=True):
+        """Construct an appropriate ZipInfo for a file on the filesystem.
+
+        filename should be the path to a file or directory on the filesystem.
+
+        arcname is the name which it will have within the archive (by default,
+        this will be the same as filename, but without a drive letter and with
+        leading path separators removed).
+        """
+        if isinstance(filename, PathLike):
+            filename = fspath(filename)
+        st = os_stat(filename)
+        isdir = stat.S_ISDIR(st.st_mode)
+        mtime = time.localtime(st.st_mtime)
+        date_time = mtime[0:6]
+        if not strict_timestamps and date_time[0] < 1980:
+            date_time = (1980, 1, 1, 0, 0, 0)
+        elif not strict_timestamps and date_time[0] > 2107:
+            date_time = (2107, 12, 31, 23, 59, 59)
+        # Create ZipInfo instance to store file information
+        if arcname is None:
+            arcname = filename
+        arcname = os.path.normpath(os_path_splitdrive(arcname)[1])
+        while arcname[0] in (OS_SEP, ALTSEP):
+            arcname = arcname[1:]
+        if isdir:
+            arcname += '/'
+        zinfo = cls(arcname, date_time)
+        zinfo.external_attr = (st.st_mode & 0xFFFF) << 16  # Unix attributes
+        if isdir:
+            zinfo.file_size = 0
+            zinfo.external_attr |= 0x10  # MS-DOS directory flag
+        else:
+            zinfo.file_size = st.st_size
+
+        return zinfo
+
+    def is_dir(self):
+        """Return True if this archive member is a directory."""
+        if self.filename.endswith('/'):
+            return True
+        # The ZIP format specification requires to use forward slashes
+        # as the directory separator, but in practice some ZIP files
+        # created on Windows can use backward slashes.  For compatibility
+        # with the extraction code which already handles this:
+        if ALTSEP:
+            return self.filename.endswith(OS_PATH_SEP) or self.filename.endswith(ALTSEP)
+        return False
+
+
+# ZIP encryption uses the CRC32 one-byte primitive for scrambling some
+# internal keys. We noticed that a direct implementation is faster than
+# relying on binascii.crc32().
+
+_crctable = None
+def _gen_crc(crc):
+    for j in range(8):
+        if crc & 1:
+            crc = (crc >> 1) ^ 0xEDB88320
+        else:
+            crc >>= 1
+    return crc
+
+# ZIP supports a password-based form of encryption. Even though known
+# plaintext attacks have been found against it, it is still useful
+# to be able to get data out of such a file.
+#
+# Usage:
+#     zd = _ZipDecrypter(mypwd)
+#     plain_bytes = zd(cypher_bytes)
+
+def _ZipDecrypter(pwd):
+    key0 = 305419896
+    key1 = 591751049
+    key2 = 878082192
+
+    global _crctable
+    if _crctable is None:
+        _crctable = list(map(_gen_crc, range(256)))
+    crctable = _crctable
+
+    def crc32(ch, crc):
+        """Compute the CRC32 primitive on one byte."""
+        return (crc >> 8) ^ crctable[(crc ^ ch) & 0xFF]
+
+    def update_keys(c):
+        nonlocal key0, key1, key2
+        key0 = crc32(c, key0)
+        key1 = (key1 + (key0 & 0xFF)) & 0xFFFFFFFF
+        key1 = (key1 * 134775813 + 1) & 0xFFFFFFFF
+        key2 = crc32(key1 >> 24, key2)
+
+    for p in pwd:
+        update_keys(p)
+
+    def decrypter(data):
+        """Decrypt a bytes object."""
+        result = bytearray()
+        append = result.append
+        for c in data:
+            k = key2 | 2
+            c ^= ((k * (k^1)) >> 8) & 0xFF
+            update_keys(c)
+            append(c)
+        return bytes(result)
+
+    return decrypter
+
+
+
+class DeflateCompressor:
+
+    def __init__(self, compresslevel=5):
+        if compresslevel is None:
+            compresslevel = 5
+        self.compresslevel = compresslevel
+
+    def compress(self, data):
+
+        # compresslevel should be 0 through 9 for DEFLATED
+        # wbits for DeflateIO is 5 through 15 inclusive
+        wbits = 5+self.compresslevel
+        stream = io.BytesIO()
+        with deflate.DeflateIO(stream, deflate.ZLIB, wbits) as d:
+            d.write(data)
+        compressed = stream.getvalue()
+        return compressed
+
+    def flush(self):
+        return b''
+
+
+class DeflateDecompressor:
+
+    def __init__(self):
+        self._decomp = None
+        self.unconsumed_tail = b''
+        self.eof = False
+
+    def decompress(self, data):
+        stream = io.BytesIO(data)
+        try:
+            with deflate.DeflateIO(stream, deflate.AUTO) as d:
+                decompressed = d.read()
+        except EOFError:
+            return b''
+        except OSError:
+            return b''
+        return decompressed
+
+
+compressor_names = {
+    0: 'store',
+    1: 'shrink',
+    2: 'reduce',
+    3: 'reduce',
+    4: 'reduce',
+    5: 'reduce',
+    6: 'implode',
+    7: 'tokenize',
+    8: 'deflate',
+    9: 'deflate64',
+    10: 'implode',
+    12: 'bzip2',
+    14: 'lzma',
+    18: 'terse',
+    19: 'lz77',
+    97: 'wavpack',
+    98: 'ppmd',
+}
+
+def _check_compression(compression):
+    if compression == ZIP_STORED:
+        pass
+    elif compression == ZIP_DEFLATED:
+        pass
+    elif compression == ZIP_BZIP2:
+        raise NotImplementedError("bzip2 not supported")
+    elif compression == ZIP_LZMA:
+        raise NotImplementedError("lzma not supported")
+    else:
+        raise NotImplementedError("That compression method is not supported")
+
+
+def _get_compressor(compress_type, compresslevel=None):
+    if compress_type == ZIP_DEFLATED:
+        if deflate:
+            return DeflateCompressor(compresslevel)
+        else:
+            # zlib/CPython
+            if compresslevel is not None:
+                return zlib.compressobj(compresslevel, zlib.DEFLATED, -15)
+            return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15)
+    elif compress_type == ZIP_BZIP2:
+        if compresslevel is not None:
+            return bz2.BZ2Compressor(compresslevel)
+        return bz2.BZ2Compressor()
+    # compresslevel is ignored for ZIP_LZMA
+    elif compress_type == ZIP_LZMA:
+        return LZMACompressor()
+    else:
+        return None
+
+
+def _get_decompressor(compress_type):
+    _check_compression(compress_type)
+    if compress_type == ZIP_STORED:
+        return None
+    elif compress_type == ZIP_DEFLATED:
+        if deflate:
+            return DeflateDecompressor()
+        else:
+            return zlib.decompressobj(-15)
+    elif compress_type == ZIP_BZIP2:
+        return bz2.BZ2Decompressor()
+    elif compress_type == ZIP_LZMA:
+        return LZMADecompressor()
+    else:
+        descr = compressor_names.get(compress_type)
+        if descr:
+            raise NotImplementedError("compression type %d (%s)" % (compress_type, descr))
+        else:
+            raise NotImplementedError("compression type %d" % (compress_type,))
+
+
+class _SharedFile:
+    def __init__(self, file, pos, close, lock, writing):
+        self._file = file
+        self._pos = pos
+        self._close = close
+        self._lock = lock
+        self._writing = writing
+
+    def seekable(self):
+        file_has_seekable = hasattr(self._file, 'seekable')
+        if file_has_seekable:
+            # CPython
+            return self._file.seekable()
+        else:
+            # seekable not implemented on MicroPython, try to infer
+            return hasattr(self._file, 'seek')
+
+    def tell(self):
+        return self._pos
+
+    def seek(self, offset, whence=0):
+        with self._lock:
+            if self._writing():
+                raise ValueError("Can't reposition in the ZIP file while "
+                        "there is an open writing handle on it. "
+                        "Close the writing handle before trying to read.")
+            self._file.seek(offset, whence)
+            self._pos = self._file.tell()
+            return self._pos
+
+    def read(self, n=-1):
+        with self._lock:
+            if self._writing():
+                raise ValueError("Can't read from the ZIP file while there "
+                        "is an open writing handle on it. "
+                        "Close the writing handle before trying to read.")
+            self._file.seek(self._pos)
+            data = self._file.read(n)
+            self._pos = self._file.tell()
+            return data
+
+    def close(self):
+        if self._file is not None:
+            fileobj = self._file
+            self._file = None
+            self._close(fileobj)
+
+# Provide the tell method for unseekable stream
+class _Tellable:
+    def __init__(self, fp):
+        self.fp = fp
+        self.offset = 0
+
+    def write(self, data):
+        n = self.fp.write(data)
+        self.offset += n
+        return n
+
+    def tell(self):
+        return self.offset
+
+    def flush(self):
+        self.fp.flush()
+
+    def close(self):
+        self.fp.close()
+
+
+class ZipExtFile(BufferedIOBase):
+    """File-like object for reading an archive member.
+       Is returned by ZipFile.open().
+    """
+
+    # Max size supported by decompressor.
+    MAX_N = 1 << 31 - 1
+
+    # Read from compressed files in 4k blocks.
+    MIN_READ_SIZE = 4096
+
+    # Chunk size to read during seek
+    MAX_SEEK_READ = 1 << 24
+
+    def __init__(self, fileobj, mode, zipinfo, pwd=None,
+                 close_fileobj=False):
+        super().__init__()
+
+        self._fileobj = fileobj
+        self._pwd = pwd
+        self._close_fileobj = close_fileobj
+
+        self._compress_type = zipinfo.compress_type
+        self._compress_left = zipinfo.compress_size
+        self._left = zipinfo.file_size
+
+        self._decompressor = _get_decompressor(self._compress_type)
+
+        self._eof = False
+        self._readbuffer = b''
+        self._offset = 0
+
+        self.newlines = None
+
+        self.mode = mode
+        self.name = zipinfo.filename
+
+        if hasattr(zipinfo, 'CRC'):
+            self._expected_crc = zipinfo.CRC
+            self._running_crc = crc32(b'')
+        else:
+            self._expected_crc = None
+
+        self._seekable = False
+        try:
+            if fileobj.seekable():
+                self._orig_compress_start = fileobj.tell()
+                self._orig_compress_size = zipinfo.compress_size
+                self._orig_file_size = zipinfo.file_size
+                self._orig_start_crc = self._running_crc
+                self._orig_crc = self._expected_crc
+                self._seekable = True
+        except AttributeError:
+            pass
+
+        self._decrypter = None
+        if pwd:
+            if zipinfo.flag_bits & _MASK_USE_DATA_DESCRIPTOR:
+                # compare against the file type from extended local headers
+                check_byte = (zipinfo._raw_time >> 8) & 0xff
+            else:
+                # compare against the CRC otherwise
+                check_byte = (zipinfo.CRC >> 24) & 0xff
+            h = self._init_decrypter()
+            if h != check_byte:
+                raise RuntimeError("Bad password for file %r" % zipinfo.orig_filename)
+
+
+    def _init_decrypter(self):
+        self._decrypter = _ZipDecrypter(self._pwd)
+        # The first 12 bytes in the cypher stream is an encryption header
+        #  used to strengthen the algorithm. The first 11 bytes are
+        #  completely random, while the 12th contains the MSB of the CRC,
+        #  or the MSB of the file time depending on the header type
+        #  and is used to check the correctness of the password.
+        header = self._fileobj.read(12)
+        self._compress_left -= 12
+        return self._decrypter(header)[11]
+
+    def __repr__(self):
+        result = ['<%s.%s' % (self.__class__.__module__,
+                              self.__class__.__qualname__)]
+        if not self.closed:
+            result.append(' name=%r mode=%r' % (self.name, self.mode))
+            if self._compress_type != ZIP_STORED:
+                result.append(' compress_type=%s' %
+                              compressor_names.get(self._compress_type,
+                                                   self._compress_type))
+        else:
+            result.append(' [closed]')
+        result.append('>')
+        return ''.join(result)
+
+    def readline(self, limit=-1):
+        """Read and return a line from the stream.
+
+        If limit is specified, at most limit bytes will be read.
+        """
+
+        if limit < 0:
+            # Shortcut common case - newline found in buffer.
+            i = self._readbuffer.find(b'\n', self._offset) + 1
+            if i > 0:
+                line = self._readbuffer[self._offset: i]
+                self._offset = i
+                return line
+
+        return BufferedIOBase.readline(self, limit)
+
+    def peek(self, n=1):
+        """Returns buffered bytes without advancing the position."""
+        if n > len(self._readbuffer) - self._offset:
+            chunk = self.read(n)
+            if len(chunk) > self._offset:
+                self._readbuffer = chunk + self._readbuffer[self._offset:]
+                self._offset = 0
+            else:
+                self._offset -= len(chunk)
+
+        # Return up to 512 bytes to reduce allocation overhead for tight loops.
+        return self._readbuffer[self._offset: self._offset + 512]
+
+    def writable(self):
+        return self.mode == 'w'
+
+    def readable(self):
+        if self.closed:
+            raise ValueError("I/O operation on closed file.")
+        return True
+
+    def read(self, n=-1):
+        """Read and return up to n bytes.
+        If the argument is omitted, None, or negative, data is read and returned until EOF is reached.
+        """
+        if self.closed:
+            raise ValueError("read from closed file.")
+        if n is None or n < 0:
+            buf = self._readbuffer[self._offset:]
+            self._readbuffer = b''
+            self._offset = 0
+            while not self._eof:
+                buf += self._read1(self.MAX_N)
+            return buf
+
+        end = n + self._offset
+        if end < len(self._readbuffer):
+            buf = self._readbuffer[self._offset:end]
+            self._offset = end
+            return buf
+
+        n = end - len(self._readbuffer)
+        buf = self._readbuffer[self._offset:]
+        self._readbuffer = b''
+        self._offset = 0
+        while n > 0 and not self._eof:
+            data = self._read1(n)
+            if n < len(data):
+                self._readbuffer = data
+                self._offset = n
+                buf += data[:n]
+                break
+            buf += data
+            n -= len(data)
+        return buf
+
+    def _update_crc(self, newdata):
+        # Update the CRC using the given data.
+        if self._expected_crc is None:
+            # No need to compute the CRC if we don't have a reference value
+            return
+        self._running_crc = crc32(newdata, self._running_crc)
+        # Check the CRC if we're at the end of the file
+        if self._eof and self._running_crc != self._expected_crc:
+            raise BadZipFile("Bad CRC-32 for file %r" % self.name)
+
+    def read1(self, n):
+        """Read up to n bytes with at most one read() system call."""
+
+        if n is None or n < 0:
+            buf = self._readbuffer[self._offset:]
+            self._readbuffer = b''
+            self._offset = 0
+            while not self._eof:
+                data = self._read1(self.MAX_N)
+                if data:
+                    buf += data
+                    break
+            return buf
+
+        end = n + self._offset
+        if end < len(self._readbuffer):
+            buf = self._readbuffer[self._offset:end]
+            self._offset = end
+            return buf
+
+        n = end - len(self._readbuffer)
+        buf = self._readbuffer[self._offset:]
+        self._readbuffer = b''
+        self._offset = 0
+        if n > 0:
+            while not self._eof:
+                data = self._read1(n)
+                if n < len(data):
+                    self._readbuffer = data
+                    self._offset = n
+                    buf += data[:n]
+                    break
+                if data:
+                    buf += data
+                    break
+        return buf
+
+    def _read1(self, n):
+        # Read up to n compressed bytes with at most one read() system call,
+        # decrypt and decompress them.
+        if self._eof or n <= 0:
+            return b''
+
+        # Read from file.
+        if self._compress_type == ZIP_DEFLATED:
+            ## Handle unconsumed data.
+            data = self._decompressor.unconsumed_tail
+            if n > len(data):
+                data += self._read2(n - len(data))
+        else:
+            data = self._read2(n)
+
+        if self._compress_type == ZIP_STORED:
+            self._eof = self._compress_left <= 0
+        elif self._compress_type == ZIP_DEFLATED and zlib:
+            n = max(n, self.MIN_READ_SIZE)
+            data = self._decompressor.decompress(data, n)
+            self._eof = (self._decompressor.eof or
+                         self._compress_left <= 0 and
+                         not self._decompressor.unconsumed_tail)
+            if self._eof:
+                data += self._decompressor.flush()
+        else:
+            data = self._decompressor.decompress(data)
+            self._eof = self._decompressor.eof or self._compress_left <= 0
+
+        data = data[:self._left]
+        self._left -= len(data)
+        if self._left <= 0:
+            self._eof = True
+        self._update_crc(data)
+        return data
+
+    def _read2(self, n):
+        if self._compress_left <= 0:
+            return b''
+
+        n = max(n, self.MIN_READ_SIZE)
+        n = min(n, self._compress_left)
+
+        data = self._fileobj.read(n)
+        self._compress_left -= len(data)
+        if not data:
+            raise EOFError
+
+        if self._decrypter is not None:
+            data = self._decrypter(data)
+        return data
+
+    def close(self):
+        try:
+            if self._close_fileobj:
+                self._fileobj.close()
+        finally:
+            super().close()
+
+    def seekable(self):
+        if self.closed:
+            raise ValueError("I/O operation on closed file.")
+        return self._seekable
+
+    def seek(self, offset, whence=SEEK_SET):
+        if self.closed:
+            raise ValueError("seek on closed file.")
+        if not self._seekable:
+            raise UnsupportedOperation("underlying stream is not seekable")
+        curr_pos = self.tell()
+        if whence == SEEK_SET:
+            new_pos = offset
+        elif whence == SEEK_CUR:
+            new_pos = curr_pos + offset
+        elif whence == SEEK_END:
+            new_pos = self._orig_file_size + offset
+        else:
+            raise ValueError("whence must be os.SEEK_SET (0), "
+                             "os.SEEK_CUR (1), or os.SEEK_END (2)")
+
+        if new_pos > self._orig_file_size:
+            new_pos = self._orig_file_size
+
+        if new_pos < 0:
+            new_pos = 0
+
+        read_offset = new_pos - curr_pos
+        buff_offset = read_offset + self._offset
+
+        if buff_offset >= 0 and buff_offset < len(self._readbuffer):
+            # Just move the _offset index if the new position is in the _readbuffer
+            self._offset = buff_offset
+            read_offset = 0
+        # Fast seek uncompressed unencrypted file
+        elif self._compress_type == ZIP_STORED and self._decrypter is None and read_offset > 0:
+            # disable CRC checking after first seeking - it would be invalid
+            self._expected_crc = None
+            # seek actual file taking already buffered data into account
+            read_offset -= len(self._readbuffer) - self._offset
+            self._fileobj.seek(read_offset, SEEK_CUR)
+            self._left -= read_offset
+            read_offset = 0
+            # flush read buffer
+            self._readbuffer = b''
+            self._offset = 0
+        elif read_offset < 0:
+            # Position is before the current position. Reset the ZipExtFile
+            self._fileobj.seek(self._orig_compress_start)
+            self._running_crc = self._orig_start_crc
+            self._expected_crc = self._orig_crc
+            self._compress_left = self._orig_compress_size
+            self._left = self._orig_file_size
+            self._readbuffer = b''
+            self._offset = 0
+            self._decompressor = _get_decompressor(self._compress_type)
+            self._eof = False
+            read_offset = new_pos
+            if self._decrypter is not None:
+                self._init_decrypter()
+
+        while read_offset > 0:
+            read_len = min(self.MAX_SEEK_READ, read_offset)
+            self.read(read_len)
+            read_offset -= read_len
+
+        return self.tell()
+
+    def tell(self):
+        if self.closed:
+            raise ValueError("tell on closed file.")
+        if not self._seekable:
+            raise UnsupportedOperation("underlying stream is not seekable")
+        filepos = self._orig_file_size - self._left - len(self._readbuffer) + self._offset
+        return filepos
+
+
+class _ZipWriteFile(BufferedIOBase):
+    def __init__(self, zf, zinfo, zip64):
+        super().__init__()
+
+        self._zinfo = zinfo
+        self._zip64 = zip64
+        self._zipfile = zf
+        self._compressor = _get_compressor(zinfo.compress_type,
+                                           zinfo._compresslevel)
+        self._file_size = 0
+        self._compress_size = 0
+        self._crc = 0
+
+    @property
+    def _fileobj(self):
+        return self._zipfile.fp
+
+    def writable(self):
+        return True
+
+    def readable(self):
+        return False
+
+    def seekable(self):
+        return False
+
+    def write(self, data):
+        if self.closed:
+            raise ValueError('I/O operation on closed file.')
+
+        # Accept any data that supports the buffer protocol
+        if isinstance(data, (bytes, bytearray)):
+            nbytes = len(data)
+        else:
+            data = memoryview(data)
+            nbytes = data.nbytes
+        self._file_size += nbytes
+
+        self._crc = crc32(data, self._crc)
+        if self._compressor:
+            data = self._compressor.compress(data)
+            self._compress_size += len(data)
+        self._fileobj.write(data)
+        return nbytes
+
+    def close(self):
+        if self.closed:
+            return
+        try:
+            super().close()
+            # Flush any data from the compressor, and update header info
+            if self._compressor:
+                buf = self._compressor.flush()
+                self._compress_size += len(buf)
+                self._fileobj.write(buf)
+                self._zinfo.compress_size = self._compress_size
+            else:
+                self._zinfo.compress_size = self._file_size
+            self._zinfo.CRC = self._crc
+            self._zinfo.file_size = self._file_size
+
+            if not self._zip64:
+                if self._file_size > ZIP64_LIMIT:
+                    raise RuntimeError("File size too large, try using force_zip64")
+                if self._compress_size > ZIP64_LIMIT:
+                    raise RuntimeError("Compressed size too large, try using force_zip64")
+
+            # Write updated header info
+            if self._zinfo.flag_bits & _MASK_USE_DATA_DESCRIPTOR:
+                # Write CRC and file sizes after the file data
+                fmt = '<LLQQ' if self._zip64 else '<LLLL'
+                self._fileobj.write(struct.pack(fmt, _DD_SIGNATURE, self._zinfo.CRC,
+                    self._zinfo.compress_size, self._zinfo.file_size))
+                self._zipfile.start_dir = self._fileobj.tell()
+            else:
+                # Seek backwards and write file header (which will now include
+                # correct CRC and file sizes)
+
+                # Preserve current position in file
+                self._zipfile.start_dir = self._fileobj.tell()
+                self._fileobj.seek(self._zinfo.header_offset)
+                self._fileobj.write(self._zinfo.FileHeader(self._zip64))
+                self._fileobj.seek(self._zipfile.start_dir)
+
+            # Successfully written: Add file to our caches
+            self._zipfile.filelist.append(self._zinfo)
+            self._zipfile.NameToInfo[self._zinfo.filename] = self._zinfo
+        finally:
+            self._zipfile._writing = False
+
+
+
+class ZipFile:
+    """ Class with methods to open, read, write, close, list zip files.
+
+    z = ZipFile(file, mode="r", compression=ZIP_STORED, allowZip64=True,
+                compresslevel=None)
+
+    file: Either the path to the file, or a file-like object.
+          If it is a path, the file will be opened and closed by ZipFile.
+    mode: The mode can be either read 'r', write 'w', exclusive create 'x',
+          or append 'a'.
+    compression: ZIP_STORED (no compression), ZIP_DEFLATED (requires zlib),
+                 ZIP_BZIP2 (requires bz2) or ZIP_LZMA (requires lzma).
+    allowZip64: if True ZipFile will create files with ZIP64 extensions when
+                needed, otherwise it will raise an exception when this would
+                be necessary.
+    compresslevel: None (default for the given compression type) or an integer
+                   specifying the level to pass to the compressor.
+                   When using ZIP_STORED or ZIP_LZMA this keyword has no effect.
+                   When using ZIP_DEFLATED integers 0 through 9 are accepted.
+                   When using ZIP_BZIP2 integers 1 through 9 are accepted.
+
+    """
+
+    fp = None                   # Set here since __del__ checks it
+    _windows_illegal_name_trans_table = None
+
+    def __init__(self, file, mode="r", compression=ZIP_STORED, allowZip64=True,
+                 compresslevel=None, *, strict_timestamps=True, metadata_encoding=None):
+        """Open the ZIP file with mode read 'r', write 'w', exclusive create 'x',
+        or append 'a'."""
+        if mode not in ('r', 'w', 'x', 'a'):
+            raise ValueError("ZipFile requires mode 'r', 'w', 'x', or 'a'")
+
+        _check_compression(compression)
+
+        self._allowZip64 = allowZip64
+        self._didModify = False
+        self.debug = 0  # Level of printing: 0 through 3
+        self.NameToInfo = {}    # Find file info given name
+        self.filelist = []      # List of ZipInfo instances for archive
+        self.compression = compression  # Method of compression
+        self.compresslevel = compresslevel
+        self.mode = mode
+        self.pwd = None
+        self._comment = b''
+        self._strict_timestamps = strict_timestamps
+        self.metadata_encoding = metadata_encoding
+
+        # Check that we don't try to write with nonconforming codecs
+        if self.metadata_encoding and mode != 'r':
+            raise ValueError(
+                "metadata_encoding is only supported for reading files")
+        if self.metadata_encoding and self.metadata_encoding not in ('ascii', 'utf-8'):
+            raise ValueError('Unsupported metadata_encoding')
+
+        # Check if we were passed a file-like object
+        if isinstance(file, PathLike):
+            file = fspath(file)
+        if isinstance(file, str):
+            # No, it's a filename
+            self._filePassed = 0
+            self.filename = file
+            modeDict = {'r' : 'rb', 'w': 'w+b', 'x': 'x+b', 'a' : 'r+b',
+                        'r+b': 'w+b', 'w+b': 'wb', 'x+b': 'xb'}
+            filemode = modeDict[mode]
+            while True:
+                try:
+                    self.fp = io.open(file, filemode)
+                except OSError:
+                    if filemode in modeDict:
+                        filemode = modeDict[filemode]
+                        continue
+                    raise
+                break
+        else:
+            self._filePassed = 1
+            self.fp = file
+            self.filename = getattr(file, 'name', None)
+        self._fileRefCnt = 1
+        self._lock = RLock()
+        self._seekable = True
+        self._writing = False
+
+        try:
+            if mode == 'r':
+                self._RealGetContents()
+            elif mode in ('w', 'x'):
+                # set the modified flag so central directory gets written
+                # even if no files are added to the archive
+                self._didModify = True
+                try:
+                    self.start_dir = self.fp.tell()
+                except (AttributeError, OSError):
+                    self.fp = _Tellable(self.fp)
+                    self.start_dir = 0
+                    self._seekable = False
+                else:
+                    # Some file-like objects can provide tell() but not seek()
+                    try:
+                        self.fp.seek(self.start_dir)
+                    except (AttributeError, OSError):
+                        self._seekable = False
+            elif mode == 'a':
+                try:
+                    # See if file is a zip file
+                    self._RealGetContents()
+                    # seek to start of directory and overwrite
+                    self.fp.seek(self.start_dir)
+                except BadZipFile:
+                    # file is not a zip file, just append
+                    self.fp.seek(0, 2)
+
+                    # set the modified flag so central directory gets written
+                    # even if no files are added to the archive
+                    self._didModify = True
+                    self.start_dir = self.fp.tell()
+            else:
+                raise ValueError("Mode must be 'r', 'w', 'x', or 'a'")
+        except:
+            fp = self.fp
+            self.fp = None
+            self._fpclose(fp)
+            raise
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type, value, traceback):
+        self.close()
+
+    def __repr__(self):
+        result = ['<%s.%s' % (self.__class__.__module__,
+                              self.__class__.__qualname__)]
+        if self.fp is not None:
+            if self._filePassed:
+                result.append(' file=%r' % self.fp)
+            elif self.filename is not None:
+                result.append(' filename=%r' % self.filename)
+            result.append(' mode=%r' % self.mode)
+        else:
+            result.append(' [closed]')
+        result.append('>')
+        return ''.join(result)
+
+    def _RealGetContents(self):
+        """Read in the table of contents for the ZIP file."""
+        fp = self.fp
+        try:
+            endrec = _EndRecData(fp)
+        except OSError:
+            raise BadZipFile("File is not a zip file")
+        if not endrec:
+            raise BadZipFile("File is not a zip file")
+        if self.debug > 1:
+            print(endrec)
+        size_cd = endrec[_ECD_SIZE]             # bytes in central directory
+        offset_cd = endrec[_ECD_OFFSET]         # offset of central directory
+        self._comment = endrec[_ECD_COMMENT]    # archive comment
+
+        # "concat" is zero, unless zip was concatenated to another file
+        concat = endrec[_ECD_LOCATION] - size_cd - offset_cd
+        if endrec[_ECD_SIGNATURE] == stringEndArchive64:
+            # If Zip64 extension structures are present, account for them
+            concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator)
+
+        if self.debug > 2:
+            inferred = concat + offset_cd
+            print("given, inferred, offset", offset_cd, inferred, concat)
+        # self.start_dir:  Position of start of central directory
+        self.start_dir = offset_cd + concat
+        if self.start_dir < 0:
+            raise BadZipFile("Bad offset for central directory")
+        fp.seek(self.start_dir, 0)
+        data = fp.read(size_cd)
+        fp = io.BytesIO(data)
+        total = 0
+        while total < size_cd:
+            centdir = fp.read(sizeCentralDir)
+            if len(centdir) != sizeCentralDir:
+                raise BadZipFile("Truncated central directory")
+            centdir = struct.unpack(structCentralDir, centdir)
+            if centdir[_CD_SIGNATURE] != stringCentralDir:
+                raise BadZipFile("Bad magic number for central directory")
+            if self.debug > 2:
+                print(centdir)
+            filename = fp.read(centdir[_CD_FILENAME_LENGTH])
+            orig_filename_crc = crc32(filename)
+            flags = centdir[_CD_FLAG_BITS]
+            if flags & _MASK_UTF_FILENAME:
+                # UTF-8 file names extension
+                filename = filename.decode('utf-8')
+            else:
+                # Historical ZIP filename encoding
+                filename = filename.decode(self.metadata_encoding or 'cp437')
+            # Create ZipInfo instance to store file information
+            x = ZipInfo(filename)
+            x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH])
+            x.comment = fp.read(centdir[_CD_COMMENT_LENGTH])
+            x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET]
+            (x.create_version, x.create_system, x.extract_version, x.reserved,
+             x.flag_bits, x.compress_type, t, d,
+             x.CRC, x.compress_size, x.file_size) = centdir[1:12]
+            if x.extract_version > MAX_EXTRACT_VERSION:
+                raise NotImplementedError("zip file version %.1f" %
+                                          (x.extract_version / 10))
+            x.volume, x.internal_attr, x.external_attr = centdir[15:18]
+            # Convert date/time code to (year, month, day, hour, min, sec)
+            x._raw_time = t
+            x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F,
+                            t>>11, (t>>5)&0x3F, (t&0x1F) * 2 )
+            x._decodeExtra(orig_filename_crc)
+            x.header_offset = x.header_offset + concat
+            self.filelist.append(x)
+            self.NameToInfo[x.filename] = x
+
+            # update total bytes read from central directory
+            total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH]
+                     + centdir[_CD_EXTRA_FIELD_LENGTH]
+                     + centdir[_CD_COMMENT_LENGTH])
+
+            if self.debug > 2:
+                print("total", total)
+
+        end_offset = self.start_dir
+        for zinfo in sorted(self.filelist,
+                            key=lambda zinfo: zinfo.header_offset,
+                            reverse=True):
+            zinfo._end_offset = end_offset
+            end_offset = zinfo.header_offset
+
+    def namelist(self):
+        """Return a list of file names in the archive."""
+        return [data.filename for data in self.filelist]
+
+    def infolist(self):
+        """Return a list of class ZipInfo instances for files in the
+        archive."""
+        return self.filelist
+
+    def printdir(self, file=None):
+        """Print a table of contents for the zip file."""
+        print("%-46s %19s %12s" % ("File Name", "Modified    ", "Size"),
+              file=file)
+        for zinfo in self.filelist:
+            date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6]
+            print("%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size),
+                  file=file)
+
+    def testzip(self):
+        """Read all the files and check the CRC.
+
+        Return None if all files could be read successfully, or the name
+        of the offending file otherwise."""
+        chunk_size = 2 ** 20
+        for zinfo in self.filelist:
+            try:
+                # Read by chunks, to avoid an OverflowError or a
+                # MemoryError with very large embedded files.
+                with self.open(zinfo.filename, "r") as f:
+                    while f.read(chunk_size):     # Check CRC-32
+                        pass
+            except BadZipFile:
+                return zinfo.filename
+
+    def getinfo(self, name):
+        """Return the instance of ZipInfo given 'name'."""
+        info = self.NameToInfo.get(name)
+        if info is None:
+            raise KeyError(
+                'There is no item named %r in the archive' % name)
+
+        return info
+
+    def setpassword(self, pwd):
+        """Set default password for encrypted files."""
+        if pwd and not isinstance(pwd, bytes):
+            raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__)
+        if pwd:
+            self.pwd = pwd
+        else:
+            self.pwd = None
+
+    @property
+    def comment(self):
+        """The comment text associated with the ZIP file."""
+        return self._comment
+
+    @comment.setter
+    def comment(self, comment):
+        if not isinstance(comment, bytes):
+            raise TypeError("comment: expected bytes, got %s" % type(comment).__name__)
+        # check for valid comment length
+        if len(comment) > ZIP_MAX_COMMENT:
+            warn('Archive comment is too long; truncating to %d bytes'
+                          % ZIP_MAX_COMMENT, stacklevel=2)
+            comment = comment[:ZIP_MAX_COMMENT]
+        self._comment = comment
+        self._didModify = True
+
+    def read(self, name, pwd=None):
+        """Return file bytes for name. 'pwd' is the password to decrypt
+        encrypted files."""
+        with self.open(name, "r", pwd) as fp:
+            return fp.read()
+
+    def open(self, name, mode="r", pwd=None, *, force_zip64=False):
+        """Return file-like object for 'name'.
+
+        name is a string for the file name within the ZIP file, or a ZipInfo
+        object.
+
+        mode should be 'r' to read a file already in the ZIP file, or 'w' to
+        write to a file newly added to the archive.
+
+        pwd is the password to decrypt files (only used for reading).
+
+        When writing, if the file size is not known in advance but may exceed
+        2 GiB, pass force_zip64 to use the ZIP64 format, which can handle large
+        files.  If the size is known in advance, it is best to pass a ZipInfo
+        instance for name, with zinfo.file_size set.
+        """
+        if mode not in {"r", "w"}:
+            raise ValueError('open() requires mode "r" or "w"')
+        if pwd and (mode == "w"):
+            raise ValueError("pwd is only supported for reading files")
+        if not self.fp:
+            raise ValueError(
+                "Attempt to use ZIP archive that was already closed")
+
+        # Make sure we have an info object
+        if isinstance(name, ZipInfo):
+            # 'name' is already an info object
+            zinfo = name
+        elif mode == 'w':
+            zinfo = ZipInfo(name)
+            zinfo.compress_type = self.compression
+            zinfo._compresslevel = self.compresslevel
+        else:
+            # Get info object for name
+            zinfo = self.getinfo(name)
+
+        if mode == 'w':
+            return self._open_to_write(zinfo, force_zip64=force_zip64)
+
+        if self._writing:
+            raise ValueError("Can't read from the ZIP file while there "
+                    "is an open writing handle on it. "
+                    "Close the writing handle before trying to read.")
+
+        # Open for reading:
+        self._fileRefCnt += 1
+        zef_file = _SharedFile(self.fp, zinfo.header_offset,
+                               self._fpclose, self._lock, lambda: self._writing)
+        try:
+            # Skip the file header:
+            fheader = zef_file.read(sizeFileHeader)
+            if len(fheader) != sizeFileHeader:
+                raise BadZipFile("Truncated file header")
+            fheader = struct.unpack(structFileHeader, fheader)
+            if fheader[_FH_SIGNATURE] != stringFileHeader:
+                raise BadZipFile("Bad magic number for file header")
+
+            fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
+            if fheader[_FH_EXTRA_FIELD_LENGTH]:
+                zef_file.seek(fheader[_FH_EXTRA_FIELD_LENGTH], whence=1)
+
+            if zinfo.flag_bits & _MASK_COMPRESSED_PATCH:
+                # Zip 2.7: compressed patched data
+                raise NotImplementedError("compressed patched data (flag bit 5)")
+
+            if zinfo.flag_bits & _MASK_STRONG_ENCRYPTION:
+                # strong encryption
+                raise NotImplementedError("strong encryption (flag bit 6)")
+
+            if fheader[_FH_GENERAL_PURPOSE_FLAG_BITS] & _MASK_UTF_FILENAME:
+                # UTF-8 filename
+                fname_str = fname.decode("utf-8")
+            else:
+                fname_str = fname.decode(self.metadata_encoding or "cp437")
+
+            if fname_str != zinfo.orig_filename:
+                raise BadZipFile(
+                    'File name in directory %r and header %r differ.'
+                    % (zinfo.orig_filename, fname))
+
+            if (zinfo._end_offset is not None and
+                zef_file.tell() + zinfo.compress_size > zinfo._end_offset):
+                raise BadZipFile(f"Overlapped entries: {zinfo.orig_filename!r} (possible zip bomb)")
+
+            # check for encrypted flag & handle password
+            is_encrypted = zinfo.flag_bits & _MASK_ENCRYPTED
+            if is_encrypted:
+                if not pwd:
+                    pwd = self.pwd
+                if pwd and not isinstance(pwd, bytes):
+                    raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__)
+                if not pwd:
+                    raise RuntimeError("File %r is encrypted, password "
+                                       "required for extraction" % name)
+            else:
+                pwd = None
+
+            return ZipExtFile(zef_file, mode, zinfo, pwd, True)
+        except:
+            zef_file.close()
+            raise
+
+    def _open_to_write(self, zinfo, force_zip64=False):
+        if force_zip64 and not self._allowZip64:
+            raise ValueError(
+                "force_zip64 is True, but allowZip64 was False when opening "
+                "the ZIP file."
+            )
+        if self._writing:
+            raise ValueError("Can't write to the ZIP file while there is "
+                             "another write handle open on it. "
+                             "Close the first handle before opening another.")
+
+        # Size and CRC are overwritten with correct data after processing the file
+        zinfo.compress_size = 0
+        zinfo.CRC = 0
+
+        zinfo.flag_bits = 0x00
+        if zinfo.compress_type == ZIP_LZMA:
+            # Compressed data includes an end-of-stream (EOS) marker
+            zinfo.flag_bits |= _MASK_COMPRESS_OPTION_1
+        if not self._seekable:
+            zinfo.flag_bits |= _MASK_USE_DATA_DESCRIPTOR
+
+        if not zinfo.external_attr:
+            zinfo.external_attr = 0o600 << 16  # permissions: ?rw-------
+
+        # Compressed size can be larger than uncompressed size
+        zip64 = force_zip64 or (zinfo.file_size * 1.05 > ZIP64_LIMIT)
+        if not self._allowZip64 and zip64:
+            raise LargeZipFile("Filesize would require ZIP64 extensions")
+
+        if self._seekable:
+            self.fp.seek(self.start_dir)
+        zinfo.header_offset = self.fp.tell()
+
+        self._writecheck(zinfo)
+        self._didModify = True
+
+        self.fp.write(zinfo.FileHeader(zip64))
+
+        self._writing = True
+        return _ZipWriteFile(self, zinfo, zip64)
+
+    def extract(self, member, path=None, pwd=None):
+        """Extract a member from the archive to the current working directory,
+           using its full name. Its file information is extracted as accurately
+           as possible. `member' may be a filename or a ZipInfo object. You can
+           specify a different directory using `path'. You can specify the
+           password to decrypt the file using 'pwd'.
+        """
+        if path is None:
+            path = os.getcwd()
+        else:
+            path = fspath(path)
+
+        return self._extract_member(member, path, pwd)
+
+    def extractall(self, path=None, members=None, pwd=None):
+        """Extract all members from the archive to the current working
+           directory. `path' specifies a different directory to extract to.
+           `members' is optional and must be a subset of the list returned
+           by namelist(). You can specify the password to decrypt all files
+           using 'pwd'.
+        """
+        if members is None:
+            members = self.namelist()
+
+        if path is None:
+            path = os.getcwd()
+        else:
+            path = fspath(path)
+
+        for zipinfo in members:
+            self._extract_member(zipinfo, path, pwd)
+
+    @classmethod
+    def _sanitize_windows_name(cls, arcname, pathsep):
+        """Replace bad characters and remove trailing dots from parts."""
+        table = cls._windows_illegal_name_trans_table
+        if not table:
+            illegal = ':<>|"?*'
+            table = str.maketrans(illegal, '_' * len(illegal))
+            cls._windows_illegal_name_trans_table = table
+        arcname = arcname.translate(table)
+        # remove trailing dots and spaces
+        arcname = (x.rstrip(' .') for x in arcname.split(pathsep))
+        # rejoin, removing empty parts.
+        arcname = pathsep.join(x for x in arcname if x)
+        return arcname
+
+    def _extract_member(self, member, targetpath, pwd):
+        """Extract the ZipInfo object 'member' to a physical
+           file on the path targetpath.
+        """
+        if not isinstance(member, ZipInfo):
+            member = self.getinfo(member)
+
+        # build the destination pathname, replacing
+        # forward slashes to platform specific separators.
+        arcname = member.filename.replace('/', OS_PATH_SEP)
+
+        if ALTSEP:
+            arcname = arcname.replace(ALTSEP, OS_PATH_SEP)
+        # interpret absolute pathname as relative, remove drive letter or
+        # UNC path, redundant separators, "." and ".." components.
+        arcname = os_path_splitdrive(arcname)[1]
+        invalid_path_parts = ('', CURDIR, PARDIR)
+        arcname = OS_PATH_SEP.join(x for x in arcname.split(OS_PATH_SEP)
+                                   if x not in invalid_path_parts)
+        if OS_PATH_SEP == '\\':
+            # filter illegal characters on Windows
+            arcname = self._sanitize_windows_name(arcname, OS_PATH_SEP)
+
+        if not arcname and not member.is_dir():
+            raise ValueError("Empty filename.")
+
+        targetpath = os.path.join(targetpath, arcname)
+        targetpath = os.path.normpath(targetpath)
+
+        # Create all upper directories if necessary.
+        upperdirs = os.path.dirname(targetpath)
+        if upperdirs and not os.path.exists(upperdirs):
+            makedirs(upperdirs)
+
+        if member.is_dir():
+            if not os.path.isdir(targetpath):
+                os.mkdir(targetpath)
+            return targetpath
+
+        with self.open(member, pwd=pwd) as source, \
+             open(targetpath, "wb") as target:
+            copyfileobj(source, target)
+
+        return targetpath
+
+    def _writecheck(self, zinfo):
+        """Check for errors before writing a file to the archive."""
+        if zinfo.filename in self.NameToInfo:
+            warn('Duplicate name: %r' % zinfo.filename, stacklevel=3)
+        if self.mode not in ('w', 'x', 'a'):
+            raise ValueError("write() requires mode 'w', 'x', or 'a'")
+        if not self.fp:
+            raise ValueError(
+                "Attempt to write ZIP archive that was already closed")
+        _check_compression(zinfo.compress_type)
+        if not self._allowZip64:
+            requires_zip64 = None
+            if len(self.filelist) >= ZIP_FILECOUNT_LIMIT:
+                requires_zip64 = "Files count"
+            elif zinfo.file_size > ZIP64_LIMIT:
+                requires_zip64 = "Filesize"
+            elif zinfo.header_offset > ZIP64_LIMIT:
+                requires_zip64 = "Zipfile size"
+            if requires_zip64:
+                raise LargeZipFile(requires_zip64 +
+                                   " would require ZIP64 extensions")
+
+    def write(self, filename, arcname=None,
+              compress_type=None, compresslevel=None):
+        """Put the bytes from filename into the archive under the name
+        arcname."""
+        if not self.fp:
+            raise ValueError(
+                "Attempt to write to ZIP archive that was already closed")
+        if self._writing:
+            raise ValueError(
+                "Can't write to ZIP archive while an open writing handle exists"
+            )
+
+        zinfo = ZipInfo.from_file(filename, arcname,
+                                  strict_timestamps=self._strict_timestamps)
+
+        if zinfo.is_dir():
+            zinfo.compress_size = 0
+            zinfo.CRC = 0
+            self.mkdir(zinfo)
+        else:
+            if compress_type is not None:
+                zinfo.compress_type = compress_type
+            else:
+                zinfo.compress_type = self.compression
+
+            if compresslevel is not None:
+                zinfo._compresslevel = compresslevel
+            else:
+                zinfo._compresslevel = self.compresslevel
+
+            with open(filename, "rb") as src, self.open(zinfo, 'w') as dest:
+                copyfileobj(src, dest, 1024*8)
+
+    def writestr(self, zinfo_or_arcname, data,
+                 compress_type=None, compresslevel=None):
+        """Write a file into the archive.  The contents is 'data', which
+        may be either a 'str' or a 'bytes' instance; if it is a 'str',
+        it is encoded as UTF-8 first.
+        'zinfo_or_arcname' is either a ZipInfo instance or
+        the name of the file in the archive."""
+        if isinstance(data, str):
+            data = data.encode("utf-8")
+        if not isinstance(zinfo_or_arcname, ZipInfo):
+            zinfo = ZipInfo(filename=zinfo_or_arcname,
+                            date_time=time.localtime(time.time())[:6])
+            zinfo.compress_type = self.compression
+            zinfo._compresslevel = self.compresslevel
+            if zinfo.filename.endswith('/'):
+                zinfo.external_attr = 0o40775 << 16   # drwxrwxr-x
+                zinfo.external_attr |= 0x10           # MS-DOS directory flag
+            else:
+                zinfo.external_attr = 0o600 << 16     # ?rw-------
+        else:
+            zinfo = zinfo_or_arcname
+
+        if not self.fp:
+            raise ValueError(
+                "Attempt to write to ZIP archive that was already closed")
+        if self._writing:
+            raise ValueError(
+                "Can't write to ZIP archive while an open writing handle exists."
+            )
+
+        if compress_type is not None:
+            zinfo.compress_type = compress_type
+
+        if compresslevel is not None:
+            zinfo._compresslevel = compresslevel
+
+        zinfo.file_size = len(data)            # Uncompressed size
+        with self._lock:
+            with self.open(zinfo, mode='w') as dest:
+                dest.write(data)
+
+    def mkdir(self, zinfo_or_directory_name, mode=511):
+        """Creates a directory inside the zip archive."""
+        if isinstance(zinfo_or_directory_name, ZipInfo):
+            zinfo = zinfo_or_directory_name
+            if not zinfo.is_dir():
+                raise ValueError("The given ZipInfo does not describe a directory")
+        elif isinstance(zinfo_or_directory_name, str):
+            directory_name = zinfo_or_directory_name
+            if not directory_name.endswith("/"):
+                directory_name += "/"
+            zinfo = ZipInfo(directory_name)
+            zinfo.compress_size = 0
+            zinfo.CRC = 0
+            zinfo.external_attr = ((0o40000 | mode) & 0xFFFF) << 16
+            zinfo.file_size = 0
+            zinfo.external_attr |= 0x10
+        else:
+            raise TypeError("Expected type str or ZipInfo")
+
+        with self._lock:
+            if self._seekable:
+                self.fp.seek(self.start_dir)
+            zinfo.header_offset = self.fp.tell()  # Start of header bytes
+            if zinfo.compress_type == ZIP_LZMA:
+            # Compressed data includes an end-of-stream (EOS) marker
+                zinfo.flag_bits |= _MASK_COMPRESS_OPTION_1
+
+            self._writecheck(zinfo)
+            self._didModify = True
+
+            self.filelist.append(zinfo)
+            self.NameToInfo[zinfo.filename] = zinfo
+            self.fp.write(zinfo.FileHeader(False))
+            self.start_dir = self.fp.tell()
+
+    def __del__(self):
+        """Call the "close()" method in case the user forgot."""
+        self.close()
+
+    def close(self):
+        """Close the file, and for mode 'w', 'x' and 'a' write the ending
+        records."""
+        if self.fp is None:
+            return
+
+        if self._writing:
+            raise ValueError("Can't close the ZIP file while there is "
+                             "an open writing handle on it. "
+                             "Close the writing handle before closing the zip.")
+
+        try:
+            if self.mode in ('w', 'x', 'a') and self._didModify: # write ending records
+                with self._lock:
+                    if self._seekable:
+                        self.fp.seek(self.start_dir)
+                    self._write_end_record()
+        finally:
+            fp = self.fp
+            self.fp = None
+            self._fpclose(fp)
+
+    def _write_end_record(self):
+        for zinfo in self.filelist:         # write central directory
+            dt = zinfo.date_time
+            dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
+            dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
+            extra = []
+            if zinfo.file_size > ZIP64_LIMIT \
+               or zinfo.compress_size > ZIP64_LIMIT:
+                extra.append(zinfo.file_size)
+                extra.append(zinfo.compress_size)
+                file_size = 0xffffffff
+                compress_size = 0xffffffff
+            else:
+                file_size = zinfo.file_size
+                compress_size = zinfo.compress_size
+
+            if zinfo.header_offset > ZIP64_LIMIT:
+                extra.append(zinfo.header_offset)
+                header_offset = 0xffffffff
+            else:
+                header_offset = zinfo.header_offset
+
+            extra_data = zinfo.extra
+            min_version = 0
+            if extra:
+                # Append a ZIP64 field to the extra's
+                extra_data = _strip_extra(extra_data, (1,))
+                extra_data = struct.pack(
+                    '<HH' + 'Q'*len(extra),
+                    1, 8*len(extra), *extra) + extra_data
+
+                min_version = ZIP64_VERSION
+
+            if zinfo.compress_type == ZIP_BZIP2:
+                min_version = max(BZIP2_VERSION, min_version)
+            elif zinfo.compress_type == ZIP_LZMA:
+                min_version = max(LZMA_VERSION, min_version)
+
+            extract_version = max(min_version, zinfo.extract_version)
+            create_version = max(min_version, zinfo.create_version)
+            filename, flag_bits = zinfo._encodeFilenameFlags()
+            centdir = struct.pack(structCentralDir,
+                                  stringCentralDir, create_version,
+                                  zinfo.create_system, extract_version, zinfo.reserved,
+                                  flag_bits, zinfo.compress_type, dostime, dosdate,
+                                  zinfo.CRC, compress_size, file_size,
+                                  len(filename), len(extra_data), len(zinfo.comment),
+                                  0, zinfo.internal_attr, zinfo.external_attr,
+                                  header_offset)
+            self.fp.write(centdir)
+            self.fp.write(filename)
+            self.fp.write(extra_data)
+            self.fp.write(zinfo.comment)
+
+        pos2 = self.fp.tell()
+        # Write end-of-zip-archive record
+        centDirCount = len(self.filelist)
+        centDirSize = pos2 - self.start_dir
+        centDirOffset = self.start_dir
+        requires_zip64 = None
+        if centDirCount > ZIP_FILECOUNT_LIMIT:
+            requires_zip64 = "Files count"
+        elif centDirOffset > ZIP64_LIMIT:
+            requires_zip64 = "Central directory offset"
+        elif centDirSize > ZIP64_LIMIT:
+            requires_zip64 = "Central directory size"
+        if requires_zip64:
+            # Need to write the ZIP64 end-of-archive records
+            if not self._allowZip64:
+                raise LargeZipFile(requires_zip64 +
+                                   " would require ZIP64 extensions")
+            zip64endrec = struct.pack(
+                structEndArchive64, stringEndArchive64,
+                44, 45, 45, 0, 0, centDirCount, centDirCount,
+                centDirSize, centDirOffset)
+            self.fp.write(zip64endrec)
+
+            zip64locrec = struct.pack(
+                structEndArchive64Locator,
+                stringEndArchive64Locator, 0, pos2, 1)
+            self.fp.write(zip64locrec)
+            centDirCount = min(centDirCount, 0xFFFF)
+            centDirSize = min(centDirSize, 0xFFFFFFFF)
+            centDirOffset = min(centDirOffset, 0xFFFFFFFF)
+
+        endrec = struct.pack(structEndArchive, stringEndArchive,
+                             0, 0, centDirCount, centDirCount,
+                             centDirSize, centDirOffset, len(self._comment))
+        self.fp.write(endrec)
+        self.fp.write(self._comment)
+        if self.mode == "a":
+            self.fp.truncate()
+        self.fp.flush()
+
+    def _fpclose(self, fp):
+        assert self._fileRefCnt > 0
+        self._fileRefCnt -= 1
+        if not self._fileRefCnt and not self._filePassed:
+            fp.close()
+
+