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MorganRamsay/zipfile.py Secret

Last active July 19, 2019 08:02
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Revisions

  1. MorganRamsay revised this gist Jun 18, 2019. 1 changed file with 1 addition and 12 deletions.
    13 changes: 1 addition & 12 deletions zipfile.py
    View file
    Original file line number Diff line number Diff line change
    @@ -1487,7 +1487,7 @@ def open(self, name, mode="r", pwd=None, *, force_zip64=False):
    if fheader[_FH_SIGNATURE] != stringFileHeader:
    raise BadZipFile("Bad magic number for file header")

    fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
    zef_file.read(fheader[_FH_FILENAME_LENGTH])
    if fheader[_FH_EXTRA_FIELD_LENGTH]:
    zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])

    @@ -1499,17 +1499,6 @@ def open(self, name, mode="r", pwd=None, *, force_zip64=False):
    # strong encryption
    raise NotImplementedError("strong encryption (flag bit 6)")

    if zinfo.flag_bits & 0x800:
    # UTF-8 filename
    fname_str = fname.decode("utf-8")
    else:
    fname_str = fname.decode("cp437")

    if fname_str != zinfo.orig_filename:
    raise BadZipFile(
    'File name in directory %r and header %r differ.'
    % (zinfo.orig_filename, fname))

    # check for encrypted flag & handle password
    is_encrypted = zinfo.flag_bits & 0x1
    zd = None
  2. MorganRamsay created this gist Jun 18, 2019.
    2,157 changes: 2,157 additions & 0 deletions zipfile.py
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,2157 @@
    """
    Read and write ZIP files.
    XXX references to utf-8 need further investigation.
    """
    import io
    import os
    import importlib.util
    import sys
    import time
    import stat
    import shutil
    import struct
    import binascii
    import threading

    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

    __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

    # 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

    _EXTRA_FIELD_STRUCT = struct.Struct('<HH')

    def _strip_extra(extra, xids):
    # Remove Extra Fields with specified IDs.
    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
    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


    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',
    )

    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. 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, "/")

    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
    # Other attributes are set by class ZipFile:
    # header_offset Byte offset to the file header
    # CRC CRC-32 of the uncompressed file
    # compress_size Size of the compressed file
    # file_size Size 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."""
    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 & 0x08:
    # 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:
    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)
    if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
    if not zip64:
    raise LargeZipFile("Filesize would require ZIP64 extensions")
    # File is larger than what fits into a 4 byte integer,
    # fall back to the ZIP64 extension
    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 | 0x800

    def _decodeExtra(self):
    # 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:
    if ln >= 24:
    counts = unpack('<QQQ', extra[4:28])
    elif ln == 16:
    counts = unpack('<QQ', extra[4:20])
    elif ln == 8:
    counts = unpack('<Q', extra[4:12])
    elif ln == 0:
    counts = ()
    else:
    raise BadZipFile("Corrupt extra field %04x (size=%d)" % (tp, ln))

    idx = 0

    # ZIP64 extension (large files and/or large archives)
    if self.file_size in (0xffffffffffffffff, 0xffffffff):
    self.file_size = counts[idx]
    idx += 1

    if self.compress_size == 0xFFFFFFFF:
    self.compress_size = counts[idx]
    idx += 1

    if self.header_offset == 0xffffffff:
    old = self.header_offset
    self.header_offset = counts[idx]
    idx+=1

    extra = extra[ln+4:]

    @classmethod
    def from_file(cls, filename, arcname=None):
    """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, os.PathLike):
    filename = os.fspath(filename)
    st = os.stat(filename)
    isdir = stat.S_ISDIR(st.st_mode)
    mtime = time.localtime(st.st_mtime)
    date_time = mtime[0:6]
    # 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, os.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."""
    return self.filename[-1] == '/'


    # 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 LZMACompressor:

    def __init__(self):
    self._comp = None

    def _init(self):
    props = lzma._encode_filter_properties({'id': lzma.FILTER_LZMA1})
    self._comp = lzma.LZMACompressor(lzma.FORMAT_RAW, filters=[
    lzma._decode_filter_properties(lzma.FILTER_LZMA1, props)
    ])
    return struct.pack('<BBH', 9, 4, len(props)) + props

    def compress(self, data):
    if self._comp is None:
    return self._init() + self._comp.compress(data)
    return self._comp.compress(data)

    def flush(self):
    if self._comp is None:
    return self._init() + self._comp.flush()
    return self._comp.flush()


    class LZMADecompressor:

    def __init__(self):
    self._decomp = None
    self._unconsumed = b''
    self.eof = False

    def decompress(self, data):
    if self._decomp is None:
    self._unconsumed += data
    if len(self._unconsumed) <= 4:
    return b''
    psize, = struct.unpack('<H', self._unconsumed[2:4])
    if len(self._unconsumed) <= 4 + psize:
    return b''

    self._decomp = lzma.LZMADecompressor(lzma.FORMAT_RAW, filters=[
    lzma._decode_filter_properties(lzma.FILTER_LZMA1,
    self._unconsumed[4:4 + psize])
    ])
    data = self._unconsumed[4 + psize:]
    del self._unconsumed

    result = self._decomp.decompress(data)
    self.eof = self._decomp.eof
    return result


    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:
    if not zlib:
    raise RuntimeError(
    "Compression requires the (missing) zlib module")
    elif compression == ZIP_BZIP2:
    if not bz2:
    raise RuntimeError(
    "Compression requires the (missing) bz2 module")
    elif compression == ZIP_LZMA:
    if not lzma:
    raise RuntimeError(
    "Compression requires the (missing) lzma module")
    else:
    raise NotImplementedError("That compression method is not supported")


    def _get_compressor(compress_type, compresslevel=None):
    if compress_type == ZIP_DEFLATED:
    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):
    if compress_type == ZIP_STORED:
    return None
    elif compress_type == ZIP_DEFLATED:
    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
    self.seekable = file.seekable
    self.tell = file.tell

    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(io.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, decrypter=None,
    close_fileobj=False):
    self._fileobj = fileobj
    self._decrypter = decrypter
    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

    # Adjust read size for encrypted files since the first 12 bytes
    # are for the encryption/password information.
    if self._decrypter is not None:
    self._compress_left -= 12

    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._seekable = True
    except AttributeError:
    pass

    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 io.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 readable(self):
    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 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:
    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):
    return self._seekable

    def seek(self, offset, whence=0):
    if not self._seekable:
    raise io.UnsupportedOperation("underlying stream is not seekable")
    curr_pos = self.tell()
    if whence == 0: # Seek from start of file
    new_pos = offset
    elif whence == 1: # Seek from current position
    new_pos = curr_pos + offset
    elif whence == 2: # Seek from EOF
    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
    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._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

    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 not self._seekable:
    raise io.UnsupportedOperation("underlying stream is not seekable")
    filepos = self._orig_file_size - self._left - len(self._readbuffer) + self._offset
    return filepos


    class _ZipWriteFile(io.BufferedIOBase):
    def __init__(self, zf, zinfo, zip64):
    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 write(self, data):
    if self.closed:
    raise ValueError('I/O operation on closed file.')
    nbytes = len(data)
    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
    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

    # Write updated header info
    if self._zinfo.flag_bits & 0x08:
    # 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:
    if not self._zip64:
    if self._file_size > ZIP64_LIMIT:
    raise RuntimeError('File size unexpectedly exceeded ZIP64 '
    'limit')
    if self._compress_size > ZIP64_LIMIT:
    raise RuntimeError('Compressed size unexpectedly exceeded '
    'ZIP64 limit')
    # 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)

    self._zipfile._writing = False

    # Successfully written: Add file to our caches
    self._zipfile.filelist.append(self._zinfo)
    self._zipfile.NameToInfo[self._zinfo.filename] = self._zinfo

    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):
    """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''

    # Check if we were passed a file-like object
    if isinstance(file, os.PathLike):
    file = os.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 = threading.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
    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])
    flags = centdir[5]
    if flags & 0x800:
    # UTF-8 file names extension
    filename = filename.decode('utf-8')
    else:
    # Historical ZIP filename encoding
    filename = filename.decode('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()
    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)


    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."""
    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:
    import warnings
    warnings.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."""
    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 not isinstance(pwd, bytes):
    raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__)
    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.read(fheader[_FH_EXTRA_FIELD_LENGTH])

    if zinfo.flag_bits & 0x20:
    # Zip 2.7: compressed patched data
    raise NotImplementedError("compressed patched data (flag bit 5)")

    if zinfo.flag_bits & 0x40:
    # strong encryption
    raise NotImplementedError("strong encryption (flag bit 6)")

    if zinfo.flag_bits & 0x800:
    # UTF-8 filename
    fname_str = fname.decode("utf-8")
    else:
    fname_str = fname.decode("cp437")

    if fname_str != zinfo.orig_filename:
    raise BadZipFile(
    'File name in directory %r and header %r differ.'
    % (zinfo.orig_filename, fname))

    # check for encrypted flag & handle password
    is_encrypted = zinfo.flag_bits & 0x1
    zd = None
    if is_encrypted:
    if not pwd:
    pwd = self.pwd
    if not pwd:
    raise RuntimeError("File %r is encrypted, password "
    "required for extraction" % name)

    zd = _ZipDecrypter(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 = zef_file.read(12)
    h = zd(header[0:12])
    if zinfo.flag_bits & 0x8:
    # compare against the file type from extended local headers
    check_byte = (zinfo._raw_time >> 8) & 0xff
    else:
    # compare against the CRC otherwise
    check_byte = (zinfo.CRC >> 24) & 0xff
    if h[11] != check_byte:
    raise RuntimeError("Bad password for file %r" % name)

    return ZipExtFile(zef_file, mode, zinfo, zd, 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.")

    # Sizes and CRC are overwritten with correct data after processing the file
    if not hasattr(zinfo, 'file_size'):
    zinfo.file_size = 0
    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 |= 0x02
    if not self._seekable:
    zinfo.flag_bits |= 0x08

    if not zinfo.external_attr:
    zinfo.external_attr = 0o600 << 16 # permissions: ?rw-------

    # Compressed size can be larger than uncompressed size
    zip64 = self._allowZip64 and \
    (force_zip64 or zinfo.file_size * 1.05 > ZIP64_LIMIT)

    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'.
    """
    if path is None:
    path = os.getcwd()
    else:
    path = os.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().
    """
    if members is None:
    members = self.namelist()

    if path is None:
    path = os.getcwd()
    else:
    path = os.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
    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 os.path.altsep:
    arcname = arcname.replace(os.path.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 = ('', os.path.curdir, os.path.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)

    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):
    os.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:
    shutil.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:
    import warnings
    warnings.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)

    if zinfo.is_dir():
    zinfo.compress_size = 0
    zinfo.CRC = 0
    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

    if zinfo.is_dir():
    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 |= 0x02

    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()
    else:
    with open(filename, "rb") as src, self.open(zinfo, 'w') as dest:
    shutil.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[-1] == '/':
    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 __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)
    try:
    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)
    except DeprecationWarning:
    print((structCentralDir, stringCentralDir, create_version,
    zinfo.create_system, extract_version, zinfo.reserved,
    zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
    zinfo.CRC, compress_size, file_size,
    len(zinfo.filename), len(extra_data), len(zinfo.comment),
    0, zinfo.internal_attr, zinfo.external_attr,
    header_offset), file=sys.stderr)
    raise
    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)
    self.fp.flush()

    def _fpclose(self, fp):
    assert self._fileRefCnt > 0
    self._fileRefCnt -= 1
    if not self._fileRefCnt and not self._filePassed:
    fp.close()


    class PyZipFile(ZipFile):
    """Class to create ZIP archives with Python library files and packages."""

    def __init__(self, file, mode="r", compression=ZIP_STORED,
    allowZip64=True, optimize=-1):
    ZipFile.__init__(self, file, mode=mode, compression=compression,
    allowZip64=allowZip64)
    self._optimize = optimize

    def writepy(self, pathname, basename="", filterfunc=None):
    """Add all files from "pathname" to the ZIP archive.
    If pathname is a package directory, search the directory and
    all package subdirectories recursively for all *.py and enter
    the modules into the archive. If pathname is a plain
    directory, listdir *.py and enter all modules. Else, pathname
    must be a Python *.py file and the module will be put into the
    archive. Added modules are always module.pyc.
    This method will compile the module.py into module.pyc if
    necessary.
    If filterfunc(pathname) is given, it is called with every argument.
    When it is False, the file or directory is skipped.
    """
    pathname = os.fspath(pathname)
    if filterfunc and not filterfunc(pathname):
    if self.debug:
    label = 'path' if os.path.isdir(pathname) else 'file'
    print('%s %r skipped by filterfunc' % (label, pathname))
    return
    dir, name = os.path.split(pathname)
    if os.path.isdir(pathname):
    initname = os.path.join(pathname, "__init__.py")
    if os.path.isfile(initname):
    # This is a package directory, add it
    if basename:
    basename = "%s/%s" % (basename, name)
    else:
    basename = name
    if self.debug:
    print("Adding package in", pathname, "as", basename)
    fname, arcname = self._get_codename(initname[0:-3], basename)
    if self.debug:
    print("Adding", arcname)
    self.write(fname, arcname)
    dirlist = sorted(os.listdir(pathname))
    dirlist.remove("__init__.py")
    # Add all *.py files and package subdirectories
    for filename in dirlist:
    path = os.path.join(pathname, filename)
    root, ext = os.path.splitext(filename)
    if os.path.isdir(path):
    if os.path.isfile(os.path.join(path, "__init__.py")):
    # This is a package directory, add it
    self.writepy(path, basename,
    filterfunc=filterfunc) # Recursive call
    elif ext == ".py":
    if filterfunc and not filterfunc(path):
    if self.debug:
    print('file %r skipped by filterfunc' % path)
    continue
    fname, arcname = self._get_codename(path[0:-3],
    basename)
    if self.debug:
    print("Adding", arcname)
    self.write(fname, arcname)
    else:
    # This is NOT a package directory, add its files at top level
    if self.debug:
    print("Adding files from directory", pathname)
    for filename in sorted(os.listdir(pathname)):
    path = os.path.join(pathname, filename)
    root, ext = os.path.splitext(filename)
    if ext == ".py":
    if filterfunc and not filterfunc(path):
    if self.debug:
    print('file %r skipped by filterfunc' % path)
    continue
    fname, arcname = self._get_codename(path[0:-3],
    basename)
    if self.debug:
    print("Adding", arcname)
    self.write(fname, arcname)
    else:
    if pathname[-3:] != ".py":
    raise RuntimeError(
    'Files added with writepy() must end with ".py"')
    fname, arcname = self._get_codename(pathname[0:-3], basename)
    if self.debug:
    print("Adding file", arcname)
    self.write(fname, arcname)

    def _get_codename(self, pathname, basename):
    """Return (filename, archivename) for the path.
    Given a module name path, return the correct file path and
    archive name, compiling if necessary. For example, given
    /python/lib/string, return (/python/lib/string.pyc, string).
    """
    def _compile(file, optimize=-1):
    import py_compile
    if self.debug:
    print("Compiling", file)
    try:
    py_compile.compile(file, doraise=True, optimize=optimize)
    except py_compile.PyCompileError as err:
    print(err.msg)
    return False
    return True

    file_py = pathname + ".py"
    file_pyc = pathname + ".pyc"
    pycache_opt0 = importlib.util.cache_from_source(file_py, optimization='')
    pycache_opt1 = importlib.util.cache_from_source(file_py, optimization=1)
    pycache_opt2 = importlib.util.cache_from_source(file_py, optimization=2)
    if self._optimize == -1:
    # legacy mode: use whatever file is present
    if (os.path.isfile(file_pyc) and
    os.stat(file_pyc).st_mtime >= os.stat(file_py).st_mtime):
    # Use .pyc file.
    arcname = fname = file_pyc
    elif (os.path.isfile(pycache_opt0) and
    os.stat(pycache_opt0).st_mtime >= os.stat(file_py).st_mtime):
    # Use the __pycache__/*.pyc file, but write it to the legacy pyc
    # file name in the archive.
    fname = pycache_opt0
    arcname = file_pyc
    elif (os.path.isfile(pycache_opt1) and
    os.stat(pycache_opt1).st_mtime >= os.stat(file_py).st_mtime):
    # Use the __pycache__/*.pyc file, but write it to the legacy pyc
    # file name in the archive.
    fname = pycache_opt1
    arcname = file_pyc
    elif (os.path.isfile(pycache_opt2) and
    os.stat(pycache_opt2).st_mtime >= os.stat(file_py).st_mtime):
    # Use the __pycache__/*.pyc file, but write it to the legacy pyc
    # file name in the archive.
    fname = pycache_opt2
    arcname = file_pyc
    else:
    # Compile py into PEP 3147 pyc file.
    if _compile(file_py):
    if sys.flags.optimize == 0:
    fname = pycache_opt0
    elif sys.flags.optimize == 1:
    fname = pycache_opt1
    else:
    fname = pycache_opt2
    arcname = file_pyc
    else:
    fname = arcname = file_py
    else:
    # new mode: use given optimization level
    if self._optimize == 0:
    fname = pycache_opt0
    arcname = file_pyc
    else:
    arcname = file_pyc
    if self._optimize == 1:
    fname = pycache_opt1
    elif self._optimize == 2:
    fname = pycache_opt2
    else:
    msg = "invalid value for 'optimize': {!r}".format(self._optimize)
    raise ValueError(msg)
    if not (os.path.isfile(fname) and
    os.stat(fname).st_mtime >= os.stat(file_py).st_mtime):
    if not _compile(file_py, optimize=self._optimize):
    fname = arcname = file_py
    archivename = os.path.split(arcname)[1]
    if basename:
    archivename = "%s/%s" % (basename, archivename)
    return (fname, archivename)


    def main(args=None):
    import argparse

    description = 'A simple command-line interface for zipfile module.'
    parser = argparse.ArgumentParser(description=description)
    group = parser.add_mutually_exclusive_group(required=True)
    group.add_argument('-l', '--list', metavar='<zipfile>',
    help='Show listing of a zipfile')
    group.add_argument('-e', '--extract', nargs=2,
    metavar=('<zipfile>', '<output_dir>'),
    help='Extract zipfile into target dir')
    group.add_argument('-c', '--create', nargs='+',
    metavar=('<name>', '<file>'),
    help='Create zipfile from sources')
    group.add_argument('-t', '--test', metavar='<zipfile>',
    help='Test if a zipfile is valid')
    args = parser.parse_args(args)

    if args.test is not None:
    src = args.test
    with ZipFile(src, 'r') as zf:
    badfile = zf.testzip()
    if badfile:
    print("The following enclosed file is corrupted: {!r}".format(badfile))
    print("Done testing")

    elif args.list is not None:
    src = args.list
    with ZipFile(src, 'r') as zf:
    zf.printdir()

    elif args.extract is not None:
    src, curdir = args.extract
    with ZipFile(src, 'r') as zf:
    zf.extractall(curdir)

    elif args.create is not None:
    zip_name = args.create.pop(0)
    files = args.create

    def addToZip(zf, path, zippath):
    if os.path.isfile(path):
    zf.write(path, zippath, ZIP_DEFLATED)
    elif os.path.isdir(path):
    if zippath:
    zf.write(path, zippath)
    for nm in sorted(os.listdir(path)):
    addToZip(zf,
    os.path.join(path, nm), os.path.join(zippath, nm))
    # else: ignore

    with ZipFile(zip_name, 'w') as zf:
    for path in files:
    zippath = os.path.basename(path)
    if not zippath:
    zippath = os.path.basename(os.path.dirname(path))
    if zippath in ('', os.curdir, os.pardir):
    zippath = ''
    addToZip(zf, path, zippath)

    if __name__ == "__main__":
    main()