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Current File : /lib64/python3.6//zipfile.py
"""
Read and write ZIP files.

XXX references to utf-8 need further investigation.
"""
import io
import os
import re
import importlib.util
import sys
import time
import stat
import shutil
import struct
import binascii

try:
    import threading
except ImportError:
    import dummy_threading as 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',
        '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.  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.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._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
        # 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 tp == 1:
                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] == '/'


class _ZipDecrypter:
    """Class to handle decryption of files stored within a ZIP archive.

    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_char = zd(cypher_char)
        plain_text = map(zd, cypher_text)
    """

    def _GenerateCRCTable():
        """Generate a CRC-32 table.

        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().
        """
        poly = 0xedb88320
        table = [0] * 256
        for i in range(256):
            crc = i
            for j in range(8):
                if crc & 1:
                    crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly
                else:
                    crc = ((crc >> 1) & 0x7FFFFFFF)
            table[i] = crc
        return table
    crctable = None

    def _crc32(self, ch, crc):
        """Compute the CRC32 primitive on one byte."""
        return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ch) & 0xff]

    def __init__(self, pwd):
        if _ZipDecrypter.crctable is None:
            _ZipDecrypter.crctable = _ZipDecrypter._GenerateCRCTable()
        self.key0 = 305419896
        self.key1 = 591751049
        self.key2 = 878082192
        for p in pwd:
            self._UpdateKeys(p)

    def _UpdateKeys(self, c):
        self.key0 = self._crc32(c, self.key0)
        self.key1 = (self.key1 + (self.key0 & 255)) & 4294967295
        self.key1 = (self.key1 * 134775813 + 1) & 4294967295
        self.key2 = self._crc32((self.key1 >> 24) & 255, self.key2)

    def __call__(self, c):
        """Decrypt a single character."""
        assert isinstance(c, int)
        k = self.key2 | 2
        c = c ^ (((k * (k^1)) >> 8) & 255)
        self._UpdateKeys(c)
        return c


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):
    if compress_type == ZIP_DEFLATED:
        return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
                                zlib.DEFLATED, -15)
    elif compress_type == ZIP_BZIP2:
        return bz2.BZ2Compressor()
    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(self._pos)
            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 = bytes(map(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 = zipfile._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)
        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)

    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.

    """

    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):
        """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.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)

        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."""
        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
        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))

            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 & 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 = list(map(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):
        """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 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):
        """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
            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

        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 = 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 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 textwrap
    USAGE=textwrap.dedent("""\
        Usage:
            zipfile.py -l zipfile.zip        # Show listing of a zipfile
            zipfile.py -t zipfile.zip        # Test if a zipfile is valid
            zipfile.py -e zipfile.zip target # Extract zipfile into target dir
            zipfile.py -c zipfile.zip src ... # Create zipfile from sources
        """)
    if args is None:
        args = sys.argv[1:]

    if not args or args[0] not in ('-l', '-c', '-e', '-t'):
        print(USAGE)
        sys.exit(1)

    if args[0] == '-l':
        if len(args) != 2:
            print(USAGE)
            sys.exit(1)
        with ZipFile(args[1], 'r') as zf:
            zf.printdir()

    elif args[0] == '-t':
        if len(args) != 2:
            print(USAGE)
            sys.exit(1)
        with ZipFile(args[1], 'r') as zf:
            badfile = zf.testzip()
        if badfile:
            print("The following enclosed file is corrupted: {!r}".format(badfile))
        print("Done testing")

    elif args[0] == '-e':
        if len(args) != 3:
            print(USAGE)
            sys.exit(1)

        with ZipFile(args[1], 'r') as zf:
            zf.extractall(args[2])

    elif args[0] == '-c':
        if len(args) < 3:
            print(USAGE)
            sys.exit(1)

        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 os.listdir(path):
                    addToZip(zf,
                             os.path.join(path, nm), os.path.join(zippath, nm))
            # else: ignore

        with ZipFile(args[1], 'w') as zf:
            for path in args[2:]:
                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()

[ Back ]
Name
Size
Last Modified
Owner / Group
Permissions
Options
..
--
July 11 2025 16:48:16
root / root
0555
__pycache__
--
July 02 2025 13:48:21
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