FM / python3.6

/snap/core18/2979/usr/lib/python3.6

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
distutils/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
lib2to3/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pydoc_data/	-	0755	rm
sqlite3/	-	0755	rm
test/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	8727	0644	edit dl rm
aifc.py	32454	0644	edit dl rm
antigravity.py	477	0644	edit dl rm
argparse.py	90568	0644	edit dl rm
ast.py	12166	0644	edit dl rm
asynchat.py	11328	0644	edit dl rm
asyncore.py	20159	0644	edit dl rm
base64.py	20378	0755	edit dl rm
bdb.py	23556	0644	edit dl rm
binhex.py	13954	0644	edit dl rm
bisect.py	2595	0644	edit dl rm
bz2.py	12478	0644	edit dl rm
calendar.py	23213	0644	edit dl rm
cgi.py	36791	0755	edit dl rm
cgitb.py	12018	0644	edit dl rm
chunk.py	5425	0644	edit dl rm
cmd.py	14860	0644	edit dl rm
code.py	10614	0644	edit dl rm
codecs.py	36276	0644	edit dl rm
codeop.py	5994	0644	edit dl rm
colorsys.py	4064	0644	edit dl rm
compileall.py	12125	0644	edit dl rm
configparser.py	53592	0644	edit dl rm
contextlib.py	13162	0644	edit dl rm
copy.py	8815	0644	edit dl rm
copyreg.py	7007	0644	edit dl rm
cProfile.py	5370	0755	edit dl rm
crypt.py	1864	0644	edit dl rm
csv.py	16180	0644	edit dl rm
datetime.py	82034	0644	edit dl rm
decimal.py	320	0644	edit dl rm
difflib.py	84377	0644	edit dl rm
dis.py	18132	0644	edit dl rm
doctest.py	104391	0644	edit dl rm
dummy_threading.py	2815	0644	edit dl rm
enum.py	33606	0644	edit dl rm
filecmp.py	9830	0644	edit dl rm
fileinput.py	14471	0644	edit dl rm
fnmatch.py	3166	0644	edit dl rm
formatter.py	15143	0644	edit dl rm
fractions.py	23639	0644	edit dl rm
ftplib.py	35617	0644	edit dl rm
functools.py	31346	0644	edit dl rm
genericpath.py	4756	0644	edit dl rm
getopt.py	7489	0644	edit dl rm
getpass.py	5994	0644	edit dl rm
gettext.py	21957	0644	edit dl rm
glob.py	5638	0644	edit dl rm
gzip.py	20334	0644	edit dl rm
hashlib.py	9533	0644	edit dl rm
heapq.py	22929	0644	edit dl rm
hmac.py	5057	0644	edit dl rm
imaplib.py	53295	0644	edit dl rm
imghdr.py	3795	0644	edit dl rm
imp.py	10669	0644	edit dl rm
inspect.py	116958	0644	edit dl rm
io.py	3517	0644	edit dl rm
ipaddress.py	74563	0644	edit dl rm
keyword.py	2209	0755	edit dl rm
LICENSE.txt	12769	0644	edit dl rm
linecache.py	5312	0644	edit dl rm
locale.py	77304	0644	edit dl rm
lzma.py	12983	0644	edit dl rm
macpath.py	5971	0644	edit dl rm
macurl2path.py	2732	0644	edit dl rm
mailbox.py	78624	0644	edit dl rm
mailcap.py	9067	0644	edit dl rm
mimetypes.py	21042	0644	edit dl rm
modulefinder.py	23027	0644	edit dl rm
netrc.py	5684	0644	edit dl rm
nntplib.py	43078	0644	edit dl rm
ntpath.py	21174	0644	edit dl rm
nturl2path.py	2444	0644	edit dl rm
numbers.py	10243	0644	edit dl rm
opcode.py	5822	0644	edit dl rm
operator.py	10863	0644	edit dl rm
optparse.py	60371	0644	edit dl rm
os.py	37526	0644	edit dl rm
pathlib.py	48982	0644	edit dl rm
pdb.py	61310	0755	edit dl rm
pickle.py	55691	0644	edit dl rm
pickletools.py	91775	0644	edit dl rm
pipes.py	8916	0644	edit dl rm
pkgutil.py	21315	0644	edit dl rm
platform.py	48198	0755	edit dl rm
plistlib.py	32787	0644	edit dl rm
poplib.py	14964	0644	edit dl rm
posixpath.py	15645	0644	edit dl rm
pprint.py	20860	0644	edit dl rm
profile.py	22019	0755	edit dl rm
pstats.py	26564	0644	edit dl rm
pty.py	4763	0644	edit dl rm
pyclbr.py	13558	0644	edit dl rm
pydoc.py	103818	0755	edit dl rm
py_compile.py	7181	0644	edit dl rm
queue.py	8780	0644	edit dl rm
quopri.py	7252	0755	edit dl rm
random.py	27442	0644	edit dl rm
re.py	15552	0644	edit dl rm
reprlib.py	5336	0644	edit dl rm
rlcompleter.py	7097	0644	edit dl rm
runpy.py	11959	0644	edit dl rm
sched.py	6511	0644	edit dl rm
secrets.py	2038	0644	edit dl rm
selectors.py	19438	0644	edit dl rm
shelve.py	8515	0644	edit dl rm
shlex.py	12956	0644	edit dl rm
shutil.py	40540	0644	edit dl rm
signal.py	2123	0644	edit dl rm
site.py	21766	0644	edit dl rm
sitecustomize.py	-	0	edit dl rm
smtpd.py	34709	0755	edit dl rm
smtplib.py	44208	0755	edit dl rm
sndhdr.py	7088	0644	edit dl rm
socket.py	27443	0644	edit dl rm
socketserver.py	27010	0644	edit dl rm
sre_compile.py	19338	0644	edit dl rm
sre_constants.py	6821	0644	edit dl rm
sre_parse.py	36536	0644	edit dl rm
ssl.py	46400	0644	edit dl rm
stat.py	5038	0644	edit dl rm
statistics.py	20673	0644	edit dl rm
string.py	11795	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	62339	0644	edit dl rm
sunau.py	18095	0644	edit dl rm
symbol.py	2109	0755	edit dl rm
symtable.py	7277	0644	edit dl rm
sysconfig.py	25057	0644	edit dl rm
tabnanny.py	11401	0755	edit dl rm
tarfile.py	94969	0755	edit dl rm
telnetlib.py	23136	0644	edit dl rm
tempfile.py	31867	0644	edit dl rm
textwrap.py	19558	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	49029	0644	edit dl rm
timeit.py	13332	0755	edit dl rm
token.py	3075	0644	edit dl rm
tokenize.py	29496	0644	edit dl rm
trace.py	28723	0755	edit dl rm
traceback.py	23458	0644	edit dl rm
tracemalloc.py	16658	0644	edit dl rm
tty.py	879	0644	edit dl rm
turtle.py	143620	0644	edit dl rm
types.py	8870	0644	edit dl rm
typing.py	80274	0644	edit dl rm
uu.py	6753	0755	edit dl rm
uuid.py	23971	0644	edit dl rm
warnings.py	18488	0644	edit dl rm
wave.py	17709	0644	edit dl rm
weakref.py	20466	0644	edit dl rm
webbrowser.py	21757	0755	edit dl rm
xdrlib.py	5913	0644	edit dl rm
zipapp.py	7157	0644	edit dl rm
zipfile.py	78184	0644	edit dl rm
_bootlocale.py	1301	0644	edit dl rm
_collections_abc.py	26392	0644	edit dl rm
_compat_pickle.py	8749	0644	edit dl rm
_compression.py	5340	0644	edit dl rm
_dummy_thread.py	5118	0644	edit dl rm
_markupbase.py	14598	0644	edit dl rm
_osx_support.py	19119	0644	edit dl rm
_pydecimal.py	230228	0644	edit dl rm
_pyio.py	88097	0644	edit dl rm
_sitebuiltins.py	3115	0644	edit dl rm
_strptime.py	24747	0644	edit dl rm
_sysconfigdata_m_linux_x86_64-linux-gnu.py	22325	0644	edit dl rm
_threading_local.py	7214	0644	edit dl rm
_weakrefset.py	5705	0644	edit dl rm
__future__.py	4841	0644	edit dl rm
__phello__.foo.py	64	0644	edit dl rm

Edit: /snap/core18/2979/usr/lib/python3.6/plistlib.py (32787B)

r"""plistlib.py -- a tool to generate and parse MacOSX .plist files.

The property list (.plist) file format is a simple XML pickle supporting
basic object types, like dictionaries, lists, numbers and strings.
Usually the top level object is a dictionary.

To write out a plist file, use the dump(value, file)
function. 'value' is the top level object, 'file' is
a (writable) file object.

To parse a plist from a file, use the load(file) function,
with a (readable) file object as the only argument. It
returns the top level object (again, usually a dictionary).

To work with plist data in bytes objects, you can use loads()
and dumps().

Values can be strings, integers, floats, booleans, tuples, lists,
dictionaries (but only with string keys), Data, bytes, bytearray, or
datetime.datetime objects.

Generate Plist example:

pl = dict(
        aString = "Doodah",
        aList = ["A", "B", 12, 32.1, [1, 2, 3]],
        aFloat = 0.1,
        anInt = 728,
        aDict = dict(
            anotherString = "<hello & hi there!>",
            aUnicodeValue = "M\xe4ssig, Ma\xdf",
            aTrueValue = True,
            aFalseValue = False,
        ),
        someData = b"<binary gunk>",
        someMoreData = b"<lots of binary gunk>" * 10,
        aDate = datetime.datetime.fromtimestamp(time.mktime(time.gmtime())),
    )
    with open(fileName, 'wb') as fp:
        dump(pl, fp)

Parse Plist example:

with open(fileName, 'rb') as fp:
        pl = load(fp)
    print(pl["aKey"])
"""
__all__ = [
    "readPlist", "writePlist", "readPlistFromBytes", "writePlistToBytes",
    "Plist", "Data", "Dict", "InvalidFileException", "FMT_XML", "FMT_BINARY",
    "load", "dump", "loads", "dumps"
]

import binascii
import codecs
import contextlib
import datetime
import enum
from io import BytesIO
import itertools
import os
import re
import struct
from warnings import warn
from xml.parsers.expat import ParserCreate

PlistFormat = enum.Enum('PlistFormat', 'FMT_XML FMT_BINARY', module=__name__)
globals().update(PlistFormat.__members__)

#
#
# Deprecated functionality
#
#

class _InternalDict(dict):

# This class is needed while Dict is scheduled for deprecation:
    # we only need to warn when a *user* instantiates Dict or when
    # the "attribute notation for dict keys" is used.
    __slots__ = ()

def __getattr__(self, attr):
        try:
            value = self[attr]
        except KeyError:
            raise AttributeError(attr)
        warn("Attribute access from plist dicts is deprecated, use d[key] "
             "notation instead", DeprecationWarning, 2)
        return value

def __setattr__(self, attr, value):
        warn("Attribute access from plist dicts is deprecated, use d[key] "
             "notation instead", DeprecationWarning, 2)
        self[attr] = value

def __delattr__(self, attr):
        try:
            del self[attr]
        except KeyError:
            raise AttributeError(attr)
        warn("Attribute access from plist dicts is deprecated, use d[key] "
             "notation instead", DeprecationWarning, 2)

class Dict(_InternalDict):

def __init__(self, **kwargs):
        warn("The plistlib.Dict class is deprecated, use builtin dict instead",
             DeprecationWarning, 2)
        super().__init__(**kwargs)

@contextlib.contextmanager
def _maybe_open(pathOrFile, mode):
    if isinstance(pathOrFile, str):
        with open(pathOrFile, mode) as fp:
            yield fp

else:
        yield pathOrFile

class Plist(_InternalDict):
    """This class has been deprecated. Use dump() and load()
    functions instead, together with regular dict objects.
    """

def __init__(self, **kwargs):
        warn("The Plist class is deprecated, use the load() and "
             "dump() functions instead", DeprecationWarning, 2)
        super().__init__(**kwargs)

@classmethod
    def fromFile(cls, pathOrFile):
        """Deprecated. Use the load() function instead."""
        with _maybe_open(pathOrFile, 'rb') as fp:
            value = load(fp)
        plist = cls()
        plist.update(value)
        return plist

def write(self, pathOrFile):
        """Deprecated. Use the dump() function instead."""
        with _maybe_open(pathOrFile, 'wb') as fp:
            dump(self, fp)

def readPlist(pathOrFile):
    """
    Read a .plist from a path or file. pathOrFile should either
    be a file name, or a readable binary file object.

This function is deprecated, use load instead.
    """
    warn("The readPlist function is deprecated, use load() instead",
        DeprecationWarning, 2)

with _maybe_open(pathOrFile, 'rb') as fp:
        return load(fp, fmt=None, use_builtin_types=False,
            dict_type=_InternalDict)

def writePlist(value, pathOrFile):
    """
    Write 'value' to a .plist file. 'pathOrFile' may either be a
    file name or a (writable) file object.

This function is deprecated, use dump instead.
    """
    warn("The writePlist function is deprecated, use dump() instead",
        DeprecationWarning, 2)
    with _maybe_open(pathOrFile, 'wb') as fp:
        dump(value, fp, fmt=FMT_XML, sort_keys=True, skipkeys=False)

def readPlistFromBytes(data):
    """
    Read a plist data from a bytes object. Return the root object.

This function is deprecated, use loads instead.
    """
    warn("The readPlistFromBytes function is deprecated, use loads() instead",
        DeprecationWarning, 2)
    return load(BytesIO(data), fmt=None, use_builtin_types=False,
        dict_type=_InternalDict)

def writePlistToBytes(value):
    """
    Return 'value' as a plist-formatted bytes object.

This function is deprecated, use dumps instead.
    """
    warn("The writePlistToBytes function is deprecated, use dumps() instead",
        DeprecationWarning, 2)
    f = BytesIO()
    dump(value, f, fmt=FMT_XML, sort_keys=True, skipkeys=False)
    return f.getvalue()

class Data:
    """
    Wrapper for binary data.

This class is deprecated, use a bytes object instead.
    """

def __init__(self, data):
        if not isinstance(data, bytes):
            raise TypeError("data must be as bytes")
        self.data = data

@classmethod
    def fromBase64(cls, data):
        # base64.decodebytes just calls binascii.a2b_base64;
        # it seems overkill to use both base64 and binascii.
        return cls(_decode_base64(data))

def asBase64(self, maxlinelength=76):
        return _encode_base64(self.data, maxlinelength)

def __eq__(self, other):
        if isinstance(other, self.__class__):
            return self.data == other.data
        elif isinstance(other, bytes):
            return self.data == other
        else:
            return NotImplemented

def __repr__(self):
        return "%s(%s)" % (self.__class__.__name__, repr(self.data))

#
#
# End of deprecated functionality
#
#

#
# XML support
#

# XML 'header'
PLISTHEADER = b"""\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
"""

# Regex to find any control chars, except for \t \n and \r
_controlCharPat = re.compile(
    r"[\x00\x01\x02\x03\x04\x05\x06\x07\x08\x0b\x0c\x0e\x0f"
    r"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f]")

def _encode_base64(s, maxlinelength=76):
    # copied from base64.encodebytes(), with added maxlinelength argument
    maxbinsize = (maxlinelength//4)*3
    pieces = []
    for i in range(0, len(s), maxbinsize):
        chunk = s[i : i + maxbinsize]
        pieces.append(binascii.b2a_base64(chunk))
    return b''.join(pieces)

def _decode_base64(s):
    if isinstance(s, str):
        return binascii.a2b_base64(s.encode("utf-8"))

else:
        return binascii.a2b_base64(s)

# Contents should conform to a subset of ISO 8601
# (in particular, YYYY '-' MM '-' DD 'T' HH ':' MM ':' SS 'Z'.  Smaller units
# may be omitted with #  a loss of precision)
_dateParser = re.compile(r"(?P<year>\d\d\d\d)(?:-(?P<month>\d\d)(?:-(?P<day>\d\d)(?:T(?P<hour>\d\d)(?::(?P<minute>\d\d)(?::(?P<second>\d\d))?)?)?)?)?Z", re.ASCII)

def _date_from_string(s):
    order = ('year', 'month', 'day', 'hour', 'minute', 'second')
    gd = _dateParser.match(s).groupdict()
    lst = []
    for key in order:
        val = gd[key]
        if val is None:
            break
        lst.append(int(val))
    return datetime.datetime(*lst)

def _date_to_string(d):
    return '%04d-%02d-%02dT%02d:%02d:%02dZ' % (
        d.year, d.month, d.day,
        d.hour, d.minute, d.second
    )

def _escape(text):
    m = _controlCharPat.search(text)
    if m is not None:
        raise ValueError("strings can't contains control characters; "
                         "use bytes instead")
    text = text.replace("\r\n", "\n")       # convert DOS line endings
    text = text.replace("\r", "\n")         # convert Mac line endings
    text = text.replace("&", "&amp;")       # escape '&'
    text = text.replace("<", "&lt;")        # escape '<'
    text = text.replace(">", "&gt;")        # escape '>'
    return text

class _PlistParser:
    def __init__(self, use_builtin_types, dict_type):
        self.stack = []
        self.current_key = None
        self.root = None
        self._use_builtin_types = use_builtin_types
        self._dict_type = dict_type

def parse(self, fileobj):
        self.parser = ParserCreate()
        self.parser.StartElementHandler = self.handle_begin_element
        self.parser.EndElementHandler = self.handle_end_element
        self.parser.CharacterDataHandler = self.handle_data
        self.parser.EntityDeclHandler = self.handle_entity_decl
        self.parser.ParseFile(fileobj)
        return self.root

def handle_entity_decl(self, entity_name, is_parameter_entity, value, base, system_id, public_id, notation_name):
        # Reject plist files with entity declarations to avoid XML vulnerabilies in expat.
        # Regular plist files don't contain those declerations, and Apple's plutil tool does not
        # accept them either.
        raise InvalidFileException("XML entity declarations are not supported in plist files")

def handle_begin_element(self, element, attrs):
        self.data = []
        handler = getattr(self, "begin_" + element, None)
        if handler is not None:
            handler(attrs)

def handle_end_element(self, element):
        handler = getattr(self, "end_" + element, None)
        if handler is not None:
            handler()

def handle_data(self, data):
        self.data.append(data)

def add_object(self, value):
        if self.current_key is not None:
            if not isinstance(self.stack[-1], type({})):
                raise ValueError("unexpected element at line %d" %
                                 self.parser.CurrentLineNumber)
            self.stack[-1][self.current_key] = value
            self.current_key = None
        elif not self.stack:
            # this is the root object
            self.root = value
        else:
            if not isinstance(self.stack[-1], type([])):
                raise ValueError("unexpected element at line %d" %
                                 self.parser.CurrentLineNumber)
            self.stack[-1].append(value)

def get_data(self):
        data = ''.join(self.data)
        self.data = []
        return data

# element handlers

def begin_dict(self, attrs):
        d = self._dict_type()
        self.add_object(d)
        self.stack.append(d)

def end_dict(self):
        if self.current_key:
            raise ValueError("missing value for key '%s' at line %d" %
                             (self.current_key,self.parser.CurrentLineNumber))
        self.stack.pop()

def end_key(self):
        if self.current_key or not isinstance(self.stack[-1], type({})):
            raise ValueError("unexpected key at line %d" %
                             self.parser.CurrentLineNumber)
        self.current_key = self.get_data()

def begin_array(self, attrs):
        a = []
        self.add_object(a)
        self.stack.append(a)

def end_array(self):
        self.stack.pop()

def end_true(self):
        self.add_object(True)

def end_false(self):
        self.add_object(False)

def end_integer(self):
        self.add_object(int(self.get_data()))

def end_real(self):
        self.add_object(float(self.get_data()))

def end_string(self):
        self.add_object(self.get_data())

def end_data(self):
        if self._use_builtin_types:
            self.add_object(_decode_base64(self.get_data()))

else:
            self.add_object(Data.fromBase64(self.get_data()))

def end_date(self):
        self.add_object(_date_from_string(self.get_data()))

class _DumbXMLWriter:
    def __init__(self, file, indent_level=0, indent="\t"):
        self.file = file
        self.stack = []
        self._indent_level = indent_level
        self.indent = indent

def begin_element(self, element):
        self.stack.append(element)
        self.writeln("<%s>" % element)
        self._indent_level += 1

def end_element(self, element):
        assert self._indent_level > 0
        assert self.stack.pop() == element
        self._indent_level -= 1
        self.writeln("</%s>" % element)

def simple_element(self, element, value=None):
        if value is not None:
            value = _escape(value)
            self.writeln("<%s>%s</%s>" % (element, value, element))

else:
            self.writeln("<%s/>" % element)

def writeln(self, line):
        if line:
            # plist has fixed encoding of utf-8

# XXX: is this test needed?
            if isinstance(line, str):
                line = line.encode('utf-8')
            self.file.write(self._indent_level * self.indent)
            self.file.write(line)
        self.file.write(b'\n')

class _PlistWriter(_DumbXMLWriter):
    def __init__(
            self, file, indent_level=0, indent=b"\t", writeHeader=1,
            sort_keys=True, skipkeys=False):

if writeHeader:
            file.write(PLISTHEADER)
        _DumbXMLWriter.__init__(self, file, indent_level, indent)
        self._sort_keys = sort_keys
        self._skipkeys = skipkeys

def write(self, value):
        self.writeln("<plist version=\"1.0\">")
        self.write_value(value)
        self.writeln("</plist>")

def write_value(self, value):
        if isinstance(value, str):
            self.simple_element("string", value)

elif value is True:
            self.simple_element("true")

elif value is False:
            self.simple_element("false")

elif isinstance(value, int):
            if -1 << 63 <= value < 1 << 64:
                self.simple_element("integer", "%d" % value)
            else:
                raise OverflowError(value)

elif isinstance(value, float):
            self.simple_element("real", repr(value))

elif isinstance(value, dict):
            self.write_dict(value)

elif isinstance(value, Data):
            self.write_data(value)

elif isinstance(value, (bytes, bytearray)):
            self.write_bytes(value)

elif isinstance(value, datetime.datetime):
            self.simple_element("date", _date_to_string(value))

elif isinstance(value, (tuple, list)):
            self.write_array(value)

else:
            raise TypeError("unsupported type: %s" % type(value))

def write_data(self, data):
        self.write_bytes(data.data)

def write_bytes(self, data):
        self.begin_element("data")
        self._indent_level -= 1
        maxlinelength = max(
            16,
            76 - len(self.indent.replace(b"\t", b" " * 8) * self._indent_level))

for line in _encode_base64(data, maxlinelength).split(b"\n"):
            if line:
                self.writeln(line)
        self._indent_level += 1
        self.end_element("data")

def write_dict(self, d):
        if d:
            self.begin_element("dict")
            if self._sort_keys:
                items = sorted(d.items())
            else:
                items = d.items()

for key, value in items:
                if not isinstance(key, str):
                    if self._skipkeys:
                        continue
                    raise TypeError("keys must be strings")
                self.simple_element("key", key)
                self.write_value(value)
            self.end_element("dict")

else:
            self.simple_element("dict")

def write_array(self, array):
        if array:
            self.begin_element("array")
            for value in array:
                self.write_value(value)
            self.end_element("array")

else:
            self.simple_element("array")

def _is_fmt_xml(header):
    prefixes = (b'<?xml', b'<plist')

for pfx in prefixes:
        if header.startswith(pfx):
            return True

# Also check for alternative XML encodings, this is slightly
    # overkill because the Apple tools (and plistlib) will not
    # generate files with these encodings.
    for bom, encoding in (
                (codecs.BOM_UTF8, "utf-8"),
                (codecs.BOM_UTF16_BE, "utf-16-be"),
                (codecs.BOM_UTF16_LE, "utf-16-le"),
                # expat does not support utf-32
                #(codecs.BOM_UTF32_BE, "utf-32-be"),
                #(codecs.BOM_UTF32_LE, "utf-32-le"),
            ):
        if not header.startswith(bom):
            continue

for start in prefixes:
            prefix = bom + start.decode('ascii').encode(encoding)
            if header[:len(prefix)] == prefix:
                return True

return False

#
# Binary Plist
#

class InvalidFileException (ValueError):
    def __init__(self, message="Invalid file"):
        ValueError.__init__(self, message)

_BINARY_FORMAT = {1: 'B', 2: 'H', 4: 'L', 8: 'Q'}

_undefined = object()

class _BinaryPlistParser:
    """
    Read or write a binary plist file, following the description of the binary
    format.  Raise InvalidFileException in case of error, otherwise return the
    root object.

see also: http://opensource.apple.com/source/CF/CF-744.18/CFBinaryPList.c
    """
    def __init__(self, use_builtin_types, dict_type):
        self._use_builtin_types = use_builtin_types
        self._dict_type = dict_type

def parse(self, fp):
        try:
            # The basic file format:
            # HEADER
            # object...
            # refid->offset...
            # TRAILER
            self._fp = fp
            self._fp.seek(-32, os.SEEK_END)
            trailer = self._fp.read(32)
            if len(trailer) != 32:
                raise InvalidFileException()
            (
                offset_size, self._ref_size, num_objects, top_object,
                offset_table_offset
            ) = struct.unpack('>6xBBQQQ', trailer)
            self._fp.seek(offset_table_offset)
            self._object_offsets = self._read_ints(num_objects, offset_size)
            self._objects = [_undefined] * num_objects
            return self._read_object(top_object)

except (OSError, IndexError, struct.error, OverflowError,
                ValueError):
            raise InvalidFileException()

def _get_size(self, tokenL):
        """ return the size of the next object."""
        if tokenL == 0xF:
            m = self._fp.read(1)[0] & 0x3
            s = 1 << m
            f = '>' + _BINARY_FORMAT[s]
            return struct.unpack(f, self._fp.read(s))[0]

return tokenL

def _read_ints(self, n, size):
        data = self._fp.read(size * n)
        if size in _BINARY_FORMAT:
            return struct.unpack(f'>{n}{_BINARY_FORMAT[size]}', data)
        else:
            if not size or len(data) != size * n:
                raise InvalidFileException()
            return tuple(int.from_bytes(data[i: i + size], 'big')
                         for i in range(0, size * n, size))

def _read_refs(self, n):
        return self._read_ints(n, self._ref_size)

def _read_object(self, ref):
        """
        read the object by reference.

May recursively read sub-objects (content of an array/dict/set)
        """
        result = self._objects[ref]
        if result is not _undefined:
            return result

offset = self._object_offsets[ref]
        self._fp.seek(offset)
        token = self._fp.read(1)[0]
        tokenH, tokenL = token & 0xF0, token & 0x0F

if token == 0x00:
            result = None

elif token == 0x08:
            result = False

elif token == 0x09:
            result = True

# The referenced source code also mentions URL (0x0c, 0x0d) and
        # UUID (0x0e), but neither can be generated using the Cocoa libraries.

elif token == 0x0f:
            result = b''

elif tokenH == 0x10:  # int
            result = int.from_bytes(self._fp.read(1 << tokenL),
                                    'big', signed=tokenL >= 3)

elif token == 0x22: # real
            result = struct.unpack('>f', self._fp.read(4))[0]

elif token == 0x23: # real
            result = struct.unpack('>d', self._fp.read(8))[0]

elif token == 0x33:  # date
            f = struct.unpack('>d', self._fp.read(8))[0]
            # timestamp 0 of binary plists corresponds to 1/1/2001
            # (year of Mac OS X 10.0), instead of 1/1/1970.
            result = (datetime.datetime(2001, 1, 1) +
                      datetime.timedelta(seconds=f))

elif tokenH == 0x40:  # data
            s = self._get_size(tokenL)
            result = self._fp.read(s)
            if len(result) != s:
                raise InvalidFileException()
            if not self._use_builtin_types:
                result = Data(result)

elif tokenH == 0x50:  # ascii string
            s = self._get_size(tokenL)
            data = self._fp.read(s)
            if len(data) != s:
                raise InvalidFileException()
            result = data.decode('ascii')

elif tokenH == 0x60:  # unicode string
            s = self._get_size(tokenL) * 2
            data = self._fp.read(s)
            if len(data) != s:
                raise InvalidFileException()
            result = data.decode('utf-16be')

# tokenH == 0x80 is documented as 'UID' and appears to be used for
        # keyed-archiving, not in plists.

elif tokenH == 0xA0:  # array
            s = self._get_size(tokenL)
            obj_refs = self._read_refs(s)
            result = []
            self._objects[ref] = result
            result.extend(self._read_object(x) for x in obj_refs)

# tokenH == 0xB0 is documented as 'ordset', but is not actually
        # implemented in the Apple reference code.

# tokenH == 0xC0 is documented as 'set', but sets cannot be used in
        # plists.

elif tokenH == 0xD0:  # dict
            s = self._get_size(tokenL)
            key_refs = self._read_refs(s)
            obj_refs = self._read_refs(s)
            result = self._dict_type()
            self._objects[ref] = result
            try:
                for k, o in zip(key_refs, obj_refs):
                    result[self._read_object(k)] = self._read_object(o)
            except TypeError:
                raise InvalidFileException()
        else:
            raise InvalidFileException()

self._objects[ref] = result
        return result

def _count_to_size(count):
    if count < 1 << 8:
        return 1

elif count < 1 << 16:
        return 2

elif count << 1 << 32:
        return 4

else:
        return 8

_scalars = (str, int, float, datetime.datetime, bytes)

class _BinaryPlistWriter (object):
    def __init__(self, fp, sort_keys, skipkeys):
        self._fp = fp
        self._sort_keys = sort_keys
        self._skipkeys = skipkeys

def write(self, value):

# Flattened object list:
        self._objlist = []

# Mappings from object->objectid
        # First dict has (type(object), object) as the key,
        # second dict is used when object is not hashable and
        # has id(object) as the key.
        self._objtable = {}
        self._objidtable = {}

# Create list of all objects in the plist
        self._flatten(value)

# Size of object references in serialized containers
        # depends on the number of objects in the plist.
        num_objects = len(self._objlist)
        self._object_offsets = [0]*num_objects
        self._ref_size = _count_to_size(num_objects)

self._ref_format = _BINARY_FORMAT[self._ref_size]

# Write file header
        self._fp.write(b'bplist00')

# Write object list
        for obj in self._objlist:
            self._write_object(obj)

# Write refnum->object offset table
        top_object = self._getrefnum(value)
        offset_table_offset = self._fp.tell()
        offset_size = _count_to_size(offset_table_offset)
        offset_format = '>' + _BINARY_FORMAT[offset_size] * num_objects
        self._fp.write(struct.pack(offset_format, *self._object_offsets))

# Write trailer
        sort_version = 0
        trailer = (
            sort_version, offset_size, self._ref_size, num_objects,
            top_object, offset_table_offset
        )
        self._fp.write(struct.pack('>5xBBBQQQ', *trailer))

def _flatten(self, value):
        # First check if the object is in the object table, not used for
        # containers to ensure that two subcontainers with the same contents
        # will be serialized as distinct values.
        if isinstance(value, _scalars):
            if (type(value), value) in self._objtable:
                return

elif isinstance(value, Data):
            if (type(value.data), value.data) in self._objtable:
                return

elif id(value) in self._objidtable:
            return

# Add to objectreference map
        refnum = len(self._objlist)
        self._objlist.append(value)
        if isinstance(value, _scalars):
            self._objtable[(type(value), value)] = refnum
        elif isinstance(value, Data):
            self._objtable[(type(value.data), value.data)] = refnum
        else:
            self._objidtable[id(value)] = refnum

# And finally recurse into containers
        if isinstance(value, dict):
            keys = []
            values = []
            items = value.items()
            if self._sort_keys:
                items = sorted(items)

for k, v in items:
                if not isinstance(k, str):
                    if self._skipkeys:
                        continue
                    raise TypeError("keys must be strings")
                keys.append(k)
                values.append(v)

for o in itertools.chain(keys, values):
                self._flatten(o)

elif isinstance(value, (list, tuple)):
            for o in value:
                self._flatten(o)

def _getrefnum(self, value):
        if isinstance(value, _scalars):
            return self._objtable[(type(value), value)]
        elif isinstance(value, Data):
            return self._objtable[(type(value.data), value.data)]
        else:
            return self._objidtable[id(value)]

def _write_size(self, token, size):
        if size < 15:
            self._fp.write(struct.pack('>B', token | size))

elif size < 1 << 8:
            self._fp.write(struct.pack('>BBB', token | 0xF, 0x10, size))

elif size < 1 << 16:
            self._fp.write(struct.pack('>BBH', token | 0xF, 0x11, size))

elif size < 1 << 32:
            self._fp.write(struct.pack('>BBL', token | 0xF, 0x12, size))

else:
            self._fp.write(struct.pack('>BBQ', token | 0xF, 0x13, size))

def _write_object(self, value):
        ref = self._getrefnum(value)
        self._object_offsets[ref] = self._fp.tell()
        if value is None:
            self._fp.write(b'\x00')

elif value is False:
            self._fp.write(b'\x08')

elif value is True:
            self._fp.write(b'\x09')

elif isinstance(value, int):
            if value < 0:
                try:
                    self._fp.write(struct.pack('>Bq', 0x13, value))
                except struct.error:
                    raise OverflowError(value) from None
            elif value < 1 << 8:
                self._fp.write(struct.pack('>BB', 0x10, value))
            elif value < 1 << 16:
                self._fp.write(struct.pack('>BH', 0x11, value))
            elif value < 1 << 32:
                self._fp.write(struct.pack('>BL', 0x12, value))
            elif value < 1 << 63:
                self._fp.write(struct.pack('>BQ', 0x13, value))
            elif value < 1 << 64:
                self._fp.write(b'\x14' + value.to_bytes(16, 'big', signed=True))
            else:
                raise OverflowError(value)

elif isinstance(value, float):
            self._fp.write(struct.pack('>Bd', 0x23, value))

elif isinstance(value, datetime.datetime):
            f = (value - datetime.datetime(2001, 1, 1)).total_seconds()
            self._fp.write(struct.pack('>Bd', 0x33, f))

elif isinstance(value, Data):
            self._write_size(0x40, len(value.data))
            self._fp.write(value.data)

elif isinstance(value, (bytes, bytearray)):
            self._write_size(0x40, len(value))
            self._fp.write(value)

elif isinstance(value, str):
            try:
                t = value.encode('ascii')
                self._write_size(0x50, len(value))
            except UnicodeEncodeError:
                t = value.encode('utf-16be')
                self._write_size(0x60, len(t) // 2)

self._fp.write(t)

elif isinstance(value, (list, tuple)):
            refs = [self._getrefnum(o) for o in value]
            s = len(refs)
            self._write_size(0xA0, s)
            self._fp.write(struct.pack('>' + self._ref_format * s, *refs))

elif isinstance(value, dict):
            keyRefs, valRefs = [], []

if self._sort_keys:
                rootItems = sorted(value.items())
            else:
                rootItems = value.items()

for k, v in rootItems:
                if not isinstance(k, str):
                    if self._skipkeys:
                        continue
                    raise TypeError("keys must be strings")
                keyRefs.append(self._getrefnum(k))
                valRefs.append(self._getrefnum(v))

s = len(keyRefs)
            self._write_size(0xD0, s)
            self._fp.write(struct.pack('>' + self._ref_format * s, *keyRefs))
            self._fp.write(struct.pack('>' + self._ref_format * s, *valRefs))

else:
            raise TypeError(value)

def _is_fmt_binary(header):
    return header[:8] == b'bplist00'

#
# Generic bits
#

_FORMATS={
    FMT_XML: dict(
        detect=_is_fmt_xml,
        parser=_PlistParser,
        writer=_PlistWriter,
    ),
    FMT_BINARY: dict(
        detect=_is_fmt_binary,
        parser=_BinaryPlistParser,
        writer=_BinaryPlistWriter,
    )
}

def load(fp, *, fmt=None, use_builtin_types=True, dict_type=dict):
    """Read a .plist file. 'fp' should be (readable) file object.
    Return the unpacked root object (which usually is a dictionary).
    """
    if fmt is None:
        header = fp.read(32)
        fp.seek(0)
        for info in _FORMATS.values():
            if info['detect'](header):
                P = info['parser']
                break

else:
            raise InvalidFileException()

else:
        P = _FORMATS[fmt]['parser']

p = P(use_builtin_types=use_builtin_types, dict_type=dict_type)
    return p.parse(fp)

def loads(value, *, fmt=None, use_builtin_types=True, dict_type=dict):
    """Read a .plist file from a bytes object.
    Return the unpacked root object (which usually is a dictionary).
    """
    fp = BytesIO(value)
    return load(
        fp, fmt=fmt, use_builtin_types=use_builtin_types, dict_type=dict_type)

def dump(value, fp, *, fmt=FMT_XML, sort_keys=True, skipkeys=False):
    """Write 'value' to a .plist file. 'fp' should be a (writable)
    file object.
    """
    if fmt not in _FORMATS:
        raise ValueError("Unsupported format: %r"%(fmt,))

writer = _FORMATS[fmt]["writer"](fp, sort_keys=sort_keys, skipkeys=skipkeys)
    writer.write(value)

def dumps(value, *, fmt=FMT_XML, skipkeys=False, sort_keys=True):
    """Return a bytes object with the contents for a .plist file.
    """
    fp = BytesIO()
    dump(value, fp, fmt=fmt, skipkeys=skipkeys, sort_keys=sort_keys)
    return fp.getvalue()

cmd: