FM / python3.13

/opt/imh/python3.13/lib/python3.13

Name	Size	Mode	Actions
asyncio/	-	0755	rm
collections/	-	0755	rm
concurrent/	-	0755	rm
config-3.13-x86_64-linux-gnu/	-	0755	rm
ctypes/	-	0755	rm
curses/	-	0755	rm
dbm/	-	0755	rm
email/	-	0755	rm
encodings/	-	0755	rm
ensurepip/	-	0755	rm
html/	-	0755	rm
http/	-	0755	rm
idlelib/	-	0755	rm
importlib/	-	0755	rm
json/	-	0755	rm
lib-dynload/	-	0755	rm
logging/	-	0755	rm
multiprocessing/	-	0755	rm
pathlib/	-	0755	rm
pydoc_data/	-	0755	rm
re/	-	0755	rm
site-packages/	-	0755	rm
sqlite3/	-	0755	rm
sysconfig/	-	0755	rm
tkinter/	-	0755	rm
tomllib/	-	0755	rm
turtledemo/	-	0755	rm
unittest/	-	0755	rm
urllib/	-	0755	rm
venv/	-	0755	rm
wsgiref/	-	0755	rm
xml/	-	0755	rm
xmlrpc/	-	0755	rm
zipfile/	-	0755	rm
zoneinfo/	-	0755	rm
_pyrepl/	-	0755	rm
__phello__/	-	0755	rm
__pycache__/	-	0755	rm
abc.py	6538	0644	edit dl rm
antigravity.py	500	0644	edit dl rm
argparse.py	101661	0644	edit dl rm
ast.py	65339	0644	edit dl rm
base64.py	21630	0755	edit dl rm
bdb.py	35343	0644	edit dl rm
bisect.py	3423	0644	edit dl rm
bz2.py	11969	0644	edit dl rm
calendar.py	26077	0644	edit dl rm
cmd.py	15316	0644	edit dl rm
code.py	13170	0644	edit dl rm
codecs.py	36978	0644	edit dl rm
codeop.py	5828	0644	edit dl rm
colorsys.py	4062	0644	edit dl rm
compileall.py	20665	0644	edit dl rm
configparser.py	53831	0644	edit dl rm
contextlib.py	27801	0644	edit dl rm
contextvars.py	129	0644	edit dl rm
copy.py	8975	0644	edit dl rm
copyreg.py	7614	0644	edit dl rm
cProfile.py	6624	0755	edit dl rm
csv.py	19178	0644	edit dl rm
dataclasses.py	64545	0644	edit dl rm
datetime.py	268	0644	edit dl rm
decimal.py	2798	0644	edit dl rm
difflib.py	83367	0644	edit dl rm
dis.py	40962	0644	edit dl rm
doctest.py	109414	0644	edit dl rm
enum.py	85593	0644	edit dl rm
filecmp.py	10652	0644	edit dl rm
fileinput.py	15717	0644	edit dl rm
fnmatch.py	6180	0644	edit dl rm
fractions.py	40090	0644	edit dl rm
ftplib.py	34735	0644	edit dl rm
functools.py	39123	0644	edit dl rm
genericpath.py	6247	0644	edit dl rm
getopt.py	7488	0644	edit dl rm
getpass.py	6233	0644	edit dl rm
gettext.py	21534	0644	edit dl rm
glob.py	19720	0644	edit dl rm
graphlib.py	9648	0644	edit dl rm
gzip.py	24633	0644	edit dl rm
hashlib.py	9446	0644	edit dl rm
heapq.py	23024	0644	edit dl rm
hmac.py	7716	0644	edit dl rm
imaplib.py	54040	0644	edit dl rm
inspect.py	128276	0644	edit dl rm
io.py	3582	0644	edit dl rm
ipaddress.py	81635	0644	edit dl rm
keyword.py	1073	0644	edit dl rm
LICENSE.txt	13809	0644	edit dl rm
linecache.py	7284	0644	edit dl rm
locale.py	79033	0644	edit dl rm
lzma.py	13399	0644	edit dl rm
mailbox.py	81644	0644	edit dl rm
mimetypes.py	23851	0644	edit dl rm
modulefinder.py	23792	0644	edit dl rm
netrc.py	7031	0644	edit dl rm
ntpath.py	32806	0644	edit dl rm
nturl2path.py	2374	0644	edit dl rm
numbers.py	11769	0644	edit dl rm
opcode.py	2825	0644	edit dl rm
operator.py	10980	0644	edit dl rm
optparse.py	60369	0644	edit dl rm
os.py	41627	0644	edit dl rm
pdb.py	90925	0755	edit dl rm
pickle.py	66957	0644	edit dl rm
pickletools.py	94052	0644	edit dl rm
pkgutil.py	18281	0644	edit dl rm
platform.py	47345	0755	edit dl rm
plistlib.py	29794	0644	edit dl rm
poplib.py	14604	0644	edit dl rm
posixpath.py	18360	0644	edit dl rm
pprint.py	24158	0644	edit dl rm
profile.py	23140	0755	edit dl rm
pstats.py	29296	0644	edit dl rm
pty.py	6137	0644	edit dl rm
pyclbr.py	11396	0644	edit dl rm
pydoc.py	110064	0755	edit dl rm
py_compile.py	7837	0644	edit dl rm
queue.py	13455	0644	edit dl rm
quopri.py	7184	0755	edit dl rm
random.py	37006	0644	edit dl rm
reprlib.py	8068	0644	edit dl rm
rlcompleter.py	7918	0644	edit dl rm
runpy.py	12885	0644	edit dl rm
sched.py	6351	0644	edit dl rm
secrets.py	1984	0644	edit dl rm
selectors.py	19457	0644	edit dl rm
shelve.py	8810	0644	edit dl rm
shlex.py	13353	0644	edit dl rm
shutil.py	57463	0644	edit dl rm
signal.py	2495	0644	edit dl rm
site.py	25568	0644	edit dl rm
smtplib.py	43532	0755	edit dl rm
socket.py	37759	0644	edit dl rm
socketserver.py	28065	0644	edit dl rm
sre_compile.py	231	0644	edit dl rm
sre_constants.py	232	0644	edit dl rm
sre_parse.py	229	0644	edit dl rm
ssl.py	52706	0644	edit dl rm
stat.py	6147	0644	edit dl rm
statistics.py	61831	0644	edit dl rm
string.py	11786	0644	edit dl rm
stringprep.py	12917	0644	edit dl rm
struct.py	257	0644	edit dl rm
subprocess.py	89486	0644	edit dl rm
symtable.py	14207	0644	edit dl rm
tabnanny.py	11532	0755	edit dl rm
tarfile.py	114239	0755	edit dl rm
tempfile.py	32406	0644	edit dl rm
textwrap.py	19939	0644	edit dl rm
this.py	1003	0644	edit dl rm
threading.py	55300	0644	edit dl rm
timeit.py	13464	0755	edit dl rm
token.py	2489	0644	edit dl rm
tokenize.py	21568	0644	edit dl rm
trace.py	29714	0755	edit dl rm
traceback.py	66524	0644	edit dl rm
tracemalloc.py	18047	0644	edit dl rm
tty.py	2035	0644	edit dl rm
turtle.py	145215	0644	edit dl rm
types.py	11207	0644	edit dl rm
typing.py	132718	0644	edit dl rm
uuid.py	29458	0644	edit dl rm
warnings.py	26948	0644	edit dl rm
wave.py	23254	0644	edit dl rm
weakref.py	21513	0644	edit dl rm
webbrowser.py	24285	0755	edit dl rm
zipapp.py	8618	0644	edit dl rm
zipimport.py	32890	0644	edit dl rm
_aix_support.py	4021	0644	edit dl rm
_android_support.py	6895	0644	edit dl rm
_apple_support.py	2256	0644	edit dl rm
_collections_abc.py	32264	0644	edit dl rm
_colorize.py	2848	0644	edit dl rm
_compat_pickle.py	8735	0644	edit dl rm
_compression.py	5681	0644	edit dl rm
_ios_support.py	2672	0644	edit dl rm
_markupbase.py	14653	0644	edit dl rm
_opcode_metadata.py	9265	0644	edit dl rm
_osx_support.py	22023	0644	edit dl rm
_pydatetime.py	91983	0644	edit dl rm
_pydecimal.py	227286	0644	edit dl rm
_pyio.py	93693	0644	edit dl rm
_pylong.py	11830	0644	edit dl rm
_py_abc.py	6189	0644	edit dl rm
_sitebuiltins.py	3128	0644	edit dl rm
_strptime.py	34734	0644	edit dl rm
_sysconfigdata__linux_x86_64-linux-gnu.py	45021	0644	edit dl rm
_threading_local.py	4363	0644	edit dl rm
_weakrefset.py	5893	0644	edit dl rm
__future__.py	5218	0644	edit dl rm
__hello__.py	227	0644	edit dl rm

Edit: /opt/imh/python3.13/lib/python3.13/gzip.py (24633B)

"""Functions that read and write gzipped files.

The user of the file doesn't have to worry about the compression,
but random access is not allowed."""

# based on Andrew Kuchling's minigzip.py distributed with the zlib module

import _compression
import builtins
import io
import os
import struct
import sys
import time
import weakref
import zlib

__all__ = ["BadGzipFile", "GzipFile", "open", "compress", "decompress"]

FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16

READ = 'rb'
WRITE = 'wb'

_COMPRESS_LEVEL_FAST = 1
_COMPRESS_LEVEL_TRADEOFF = 6
_COMPRESS_LEVEL_BEST = 9

READ_BUFFER_SIZE = 128 * 1024
_WRITE_BUFFER_SIZE = 4 * io.DEFAULT_BUFFER_SIZE

def open(filename, mode="rb", compresslevel=_COMPRESS_LEVEL_BEST,
         encoding=None, errors=None, newline=None):
    """Open a gzip-compressed file in binary or text mode.

The filename argument can be an actual filename (a str or bytes object), or
    an existing file object to read from or write to.

The mode argument can be "r", "rb", "w", "wb", "x", "xb", "a" or "ab" for
    binary mode, or "rt", "wt", "xt" or "at" for text mode. The default mode is
    "rb", and the default compresslevel is 9.

For binary mode, this function is equivalent to the GzipFile constructor:
    GzipFile(filename, mode, compresslevel). In this case, the encoding, errors
    and newline arguments must not be provided.

For text mode, a GzipFile object is created, and wrapped in an
    io.TextIOWrapper instance with the specified encoding, error handling
    behavior, and line ending(s).

"""
    if "t" in mode:
        if "b" in mode:
            raise ValueError("Invalid mode: %r" % (mode,))
    else:
        if encoding is not None:
            raise ValueError("Argument 'encoding' not supported in binary mode")
        if errors is not None:
            raise ValueError("Argument 'errors' not supported in binary mode")
        if newline is not None:
            raise ValueError("Argument 'newline' not supported in binary mode")

gz_mode = mode.replace("t", "")
    if isinstance(filename, (str, bytes, os.PathLike)):
        binary_file = GzipFile(filename, gz_mode, compresslevel)
    elif hasattr(filename, "read") or hasattr(filename, "write"):
        binary_file = GzipFile(None, gz_mode, compresslevel, filename)
    else:
        raise TypeError("filename must be a str or bytes object, or a file")

if "t" in mode:
        encoding = io.text_encoding(encoding)
        return io.TextIOWrapper(binary_file, encoding, errors, newline)
    else:
        return binary_file

def write32u(output, value):
    # The L format writes the bit pattern correctly whether signed
    # or unsigned.
    output.write(struct.pack("<L", value))

class _PaddedFile:
    """Minimal read-only file object that prepends a string to the contents
    of an actual file. Shouldn't be used outside of gzip.py, as it lacks
    essential functionality."""

def __init__(self, f, prepend=b''):
        self._buffer = prepend
        self._length = len(prepend)
        self.file = f
        self._read = 0

def read(self, size):
        if self._read is None:
            return self.file.read(size)
        if self._read + size <= self._length:
            read = self._read
            self._read += size
            return self._buffer[read:self._read]
        else:
            read = self._read
            self._read = None
            return self._buffer[read:] + \
                   self.file.read(size-self._length+read)

def prepend(self, prepend=b''):
        if self._read is None:
            self._buffer = prepend
        else:  # Assume data was read since the last prepend() call
            self._read -= len(prepend)
            return
        self._length = len(self._buffer)
        self._read = 0

def seek(self, off):
        self._read = None
        self._buffer = None
        return self.file.seek(off)

def seekable(self):
        return True  # Allows fast-forwarding even in unseekable streams

class BadGzipFile(OSError):
    """Exception raised in some cases for invalid gzip files."""

class _WriteBufferStream(io.RawIOBase):
    """Minimal object to pass WriteBuffer flushes into GzipFile"""
    def __init__(self, gzip_file):
        self.gzip_file = weakref.ref(gzip_file)

def write(self, data):
        gzip_file = self.gzip_file()
        if gzip_file is None:
            raise RuntimeError("lost gzip_file")
        return gzip_file._write_raw(data)

def seekable(self):
        return False

def writable(self):
        return True

class GzipFile(_compression.BaseStream):
    """The GzipFile class simulates most of the methods of a file object with
    the exception of the truncate() method.

This class only supports opening files in binary mode. If you need to open a
    compressed file in text mode, use the gzip.open() function.

"""

# Overridden with internal file object to be closed, if only a filename
    # is passed in
    myfileobj = None

def __init__(self, filename=None, mode=None,
                 compresslevel=_COMPRESS_LEVEL_BEST, fileobj=None, mtime=None):
        """Constructor for the GzipFile class.

At least one of fileobj and filename must be given a
        non-trivial value.

The new class instance is based on fileobj, which can be a regular
        file, an io.BytesIO object, or any other object which simulates a file.
        It defaults to None, in which case filename is opened to provide
        a file object.

When fileobj is not None, the filename argument is only used to be
        included in the gzip file header, which may include the original
        filename of the uncompressed file.  It defaults to the filename of
        fileobj, if discernible; otherwise, it defaults to the empty string,
        and in this case the original filename is not included in the header.

The mode argument can be any of 'r', 'rb', 'a', 'ab', 'w', 'wb', 'x', or
        'xb' depending on whether the file will be read or written.  The default
        is the mode of fileobj if discernible; otherwise, the default is 'rb'.
        A mode of 'r' is equivalent to one of 'rb', and similarly for 'w' and
        'wb', 'a' and 'ab', and 'x' and 'xb'.

The compresslevel argument is an integer from 0 to 9 controlling the
        level of compression; 1 is fastest and produces the least compression,
        and 9 is slowest and produces the most compression. 0 is no compression
        at all. The default is 9.

The optional mtime argument is the timestamp requested by gzip. The time
        is in Unix format, i.e., seconds since 00:00:00 UTC, January 1, 1970.
        If mtime is omitted or None, the current time is used. Use mtime = 0
        to generate a compressed stream that does not depend on creation time.

"""

if mode and ('t' in mode or 'U' in mode):
            raise ValueError("Invalid mode: {!r}".format(mode))
        if mode and 'b' not in mode:
            mode += 'b'

try:
            if fileobj is None:
                fileobj = self.myfileobj = builtins.open(filename, mode or 'rb')
            if filename is None:
                filename = getattr(fileobj, 'name', '')
                if not isinstance(filename, (str, bytes)):
                    filename = ''
            else:
                filename = os.fspath(filename)
            origmode = mode
            if mode is None:
                mode = getattr(fileobj, 'mode', 'rb')

if mode.startswith('r'):
                self.mode = READ
                raw = _GzipReader(fileobj)
                self._buffer = io.BufferedReader(raw)
                self.name = filename

elif mode.startswith(('w', 'a', 'x')):
                if origmode is None:
                    import warnings
                    warnings.warn(
                        "GzipFile was opened for writing, but this will "
                        "change in future Python releases.  "
                        "Specify the mode argument for opening it for writing.",
                        FutureWarning, 2)
                self.mode = WRITE
                self._init_write(filename)
                self.compress = zlib.compressobj(compresslevel,
                                                 zlib.DEFLATED,
                                                 -zlib.MAX_WBITS,
                                                 zlib.DEF_MEM_LEVEL,
                                                 0)
                self._write_mtime = mtime
                self._buffer_size = _WRITE_BUFFER_SIZE
                self._buffer = io.BufferedWriter(_WriteBufferStream(self),
                                                 buffer_size=self._buffer_size)
            else:
                raise ValueError("Invalid mode: {!r}".format(mode))

self.fileobj = fileobj

if self.mode == WRITE:
                self._write_gzip_header(compresslevel)
        except:
            # Avoid a ResourceWarning if the write fails,
            # eg read-only file or KeyboardInterrupt
            self._close()
            raise

@property
    def mtime(self):
        """Last modification time read from stream, or None"""
        return self._buffer.raw._last_mtime

def __repr__(self):
        s = repr(self.fileobj)
        return '<gzip ' + s[1:-1] + ' ' + hex(id(self)) + '>'

def _init_write(self, filename):
        self.name = filename
        self.crc = zlib.crc32(b"")
        self.size = 0
        self.writebuf = []
        self.bufsize = 0
        self.offset = 0  # Current file offset for seek(), tell(), etc

def tell(self):
        self._check_not_closed()
        self._buffer.flush()
        return super().tell()

def _write_gzip_header(self, compresslevel):
        self.fileobj.write(b'\037\213')             # magic header
        self.fileobj.write(b'\010')                 # compression method
        try:
            # RFC 1952 requires the FNAME field to be Latin-1. Do not
            # include filenames that cannot be represented that way.
            fname = os.path.basename(self.name)
            if not isinstance(fname, bytes):
                fname = fname.encode('latin-1')
            if fname.endswith(b'.gz'):
                fname = fname[:-3]
        except UnicodeEncodeError:
            fname = b''
        flags = 0
        if fname:
            flags = FNAME
        self.fileobj.write(chr(flags).encode('latin-1'))
        mtime = self._write_mtime
        if mtime is None:
            mtime = time.time()
        write32u(self.fileobj, int(mtime))
        if compresslevel == _COMPRESS_LEVEL_BEST:
            xfl = b'\002'
        elif compresslevel == _COMPRESS_LEVEL_FAST:
            xfl = b'\004'
        else:
            xfl = b'\000'
        self.fileobj.write(xfl)
        self.fileobj.write(b'\377')
        if fname:
            self.fileobj.write(fname + b'\000')

def write(self,data):
        self._check_not_closed()
        if self.mode != WRITE:
            import errno
            raise OSError(errno.EBADF, "write() on read-only GzipFile object")

if self.fileobj is None:
            raise ValueError("write() on closed GzipFile object")

return self._buffer.write(data)

def _write_raw(self, data):
        # Called by our self._buffer underlying WriteBufferStream.
        if isinstance(data, (bytes, bytearray)):
            length = len(data)
        else:
            # accept any data that supports the buffer protocol
            data = memoryview(data)
            length = data.nbytes

if length > 0:
            self.fileobj.write(self.compress.compress(data))
            self.size += length
            self.crc = zlib.crc32(data, self.crc)
            self.offset += length

return length

def read(self, size=-1):
        self._check_not_closed()
        if self.mode != READ:
            import errno
            raise OSError(errno.EBADF, "read() on write-only GzipFile object")
        return self._buffer.read(size)

def read1(self, size=-1):
        """Implements BufferedIOBase.read1()

Reads up to a buffer's worth of data if size is negative."""
        self._check_not_closed()
        if self.mode != READ:
            import errno
            raise OSError(errno.EBADF, "read1() on write-only GzipFile object")

if size < 0:
            size = io.DEFAULT_BUFFER_SIZE
        return self._buffer.read1(size)

def peek(self, n):
        self._check_not_closed()
        if self.mode != READ:
            import errno
            raise OSError(errno.EBADF, "peek() on write-only GzipFile object")
        return self._buffer.peek(n)

@property
    def closed(self):
        return self.fileobj is None

def close(self):
        fileobj = self.fileobj
        if fileobj is None or self._buffer.closed:
            return
        try:
            if self.mode == WRITE:
                self._buffer.flush()
                fileobj.write(self.compress.flush())
                write32u(fileobj, self.crc)
                # self.size may exceed 2 GiB, or even 4 GiB
                write32u(fileobj, self.size & 0xffffffff)
            elif self.mode == READ:
                self._buffer.close()
        finally:
            self._close()

def _close(self):
        self.fileobj = None
        myfileobj = self.myfileobj
        if myfileobj is not None:
            self.myfileobj = None
            myfileobj.close()

def flush(self,zlib_mode=zlib.Z_SYNC_FLUSH):
        self._check_not_closed()
        if self.mode == WRITE:
            self._buffer.flush()
            # Ensure the compressor's buffer is flushed
            self.fileobj.write(self.compress.flush(zlib_mode))
            self.fileobj.flush()

def fileno(self):
        """Invoke the underlying file object's fileno() method.

This will raise AttributeError if the underlying file object
        doesn't support fileno().
        """
        return self.fileobj.fileno()

def rewind(self):
        '''Return the uncompressed stream file position indicator to the
        beginning of the file'''
        if self.mode != READ:
            raise OSError("Can't rewind in write mode")
        self._buffer.seek(0)

def readable(self):
        return self.mode == READ

def writable(self):
        return self.mode == WRITE

def seekable(self):
        return True

def seek(self, offset, whence=io.SEEK_SET):
        if self.mode == WRITE:
            self._check_not_closed()
            # Flush buffer to ensure validity of self.offset
            self._buffer.flush()
            if whence != io.SEEK_SET:
                if whence == io.SEEK_CUR:
                    offset = self.offset + offset
                else:
                    raise ValueError('Seek from end not supported')
            if offset < self.offset:
                raise OSError('Negative seek in write mode')
            count = offset - self.offset
            chunk = b'\0' * self._buffer_size
            for i in range(count // self._buffer_size):
                self.write(chunk)
            self.write(b'\0' * (count % self._buffer_size))
        elif self.mode == READ:
            self._check_not_closed()
            return self._buffer.seek(offset, whence)

return self.offset

def readline(self, size=-1):
        self._check_not_closed()
        return self._buffer.readline(size)

def _read_exact(fp, n):
    '''Read exactly *n* bytes from `fp`

This method is required because fp may be unbuffered,
    i.e. return short reads.
    '''
    data = fp.read(n)
    while len(data) < n:
        b = fp.read(n - len(data))
        if not b:
            raise EOFError("Compressed file ended before the "
                           "end-of-stream marker was reached")
        data += b
    return data

def _read_gzip_header(fp):
    '''Read a gzip header from `fp` and progress to the end of the header.

Returns last mtime if header was present or None otherwise.
    '''
    magic = fp.read(2)
    if magic == b'':
        return None

if magic != b'\037\213':
        raise BadGzipFile('Not a gzipped file (%r)' % magic)

(method, flag, last_mtime) = struct.unpack("<BBIxx", _read_exact(fp, 8))
    if method != 8:
        raise BadGzipFile('Unknown compression method')

if flag & FEXTRA:
        # Read & discard the extra field, if present
        extra_len, = struct.unpack("<H", _read_exact(fp, 2))
        _read_exact(fp, extra_len)
    if flag & FNAME:
        # Read and discard a null-terminated string containing the filename
        while True:
            s = fp.read(1)
            if not s or s==b'\000':
                break
    if flag & FCOMMENT:
        # Read and discard a null-terminated string containing a comment
        while True:
            s = fp.read(1)
            if not s or s==b'\000':
                break
    if flag & FHCRC:
        _read_exact(fp, 2)     # Read & discard the 16-bit header CRC
    return last_mtime

class _GzipReader(_compression.DecompressReader):
    def __init__(self, fp):
        super().__init__(_PaddedFile(fp), zlib._ZlibDecompressor,
                         wbits=-zlib.MAX_WBITS)
        # Set flag indicating start of a new member
        self._new_member = True
        self._last_mtime = None

def _init_read(self):
        self._crc = zlib.crc32(b"")
        self._stream_size = 0  # Decompressed size of unconcatenated stream

def _read_gzip_header(self):
        last_mtime = _read_gzip_header(self._fp)
        if last_mtime is None:
            return False
        self._last_mtime = last_mtime
        return True

def read(self, size=-1):
        if size < 0:
            return self.readall()
        # size=0 is special because decompress(max_length=0) is not supported
        if not size:
            return b""

# For certain input data, a single
        # call to decompress() may not return
        # any data. In this case, retry until we get some data or reach EOF.
        while True:
            if self._decompressor.eof:
                # Ending case: we've come to the end of a member in the file,
                # so finish up this member, and read a new gzip header.
                # Check the CRC and file size, and set the flag so we read
                # a new member
                self._read_eof()
                self._new_member = True
                self._decompressor = self._decomp_factory(
                    **self._decomp_args)

if self._new_member:
                # If the _new_member flag is set, we have to
                # jump to the next member, if there is one.
                self._init_read()
                if not self._read_gzip_header():
                    self._size = self._pos
                    return b""
                self._new_member = False

# Read a chunk of data from the file
            if self._decompressor.needs_input:
                buf = self._fp.read(READ_BUFFER_SIZE)
                uncompress = self._decompressor.decompress(buf, size)
            else:
                uncompress = self._decompressor.decompress(b"", size)

if self._decompressor.unused_data != b"":
                # Prepend the already read bytes to the fileobj so they can
                # be seen by _read_eof() and _read_gzip_header()
                self._fp.prepend(self._decompressor.unused_data)

if uncompress != b"":
                break
            if buf == b"":
                raise EOFError("Compressed file ended before the "
                               "end-of-stream marker was reached")

self._crc = zlib.crc32(uncompress, self._crc)
        self._stream_size += len(uncompress)
        self._pos += len(uncompress)
        return uncompress

def _read_eof(self):
        # We've read to the end of the file
        # We check that the computed CRC and size of the
        # uncompressed data matches the stored values.  Note that the size
        # stored is the true file size mod 2**32.
        crc32, isize = struct.unpack("<II", _read_exact(self._fp, 8))
        if crc32 != self._crc:
            raise BadGzipFile("CRC check failed %s != %s" % (hex(crc32),
                                                             hex(self._crc)))
        elif isize != (self._stream_size & 0xffffffff):
            raise BadGzipFile("Incorrect length of data produced")

# Gzip files can be padded with zeroes and still have archives.
        # Consume all zero bytes and set the file position to the first
        # non-zero byte. See http://www.gzip.org/#faq8
        c = b"\x00"
        while c == b"\x00":
            c = self._fp.read(1)
        if c:
            self._fp.prepend(c)

def _rewind(self):
        super()._rewind()
        self._new_member = True

def compress(data, compresslevel=_COMPRESS_LEVEL_BEST, *, mtime=None):
    """Compress data in one shot and return the compressed string.

compresslevel sets the compression level in range of 0-9.
    mtime can be used to set the modification time. The modification time is
    set to the current time by default.
    """
    # Wbits=31 automatically includes a gzip header and trailer.
    gzip_data = zlib.compress(data, level=compresslevel, wbits=31)
    if mtime is None:
        mtime = time.time()
    # Reuse gzip header created by zlib, replace mtime and OS byte for
    # consistency.
    header = struct.pack("<4sLBB", gzip_data, int(mtime), gzip_data[8], 255)
    return header + gzip_data[10:]

def decompress(data):
    """Decompress a gzip compressed string in one shot.
    Return the decompressed string.
    """
    decompressed_members = []
    while True:
        fp = io.BytesIO(data)
        if _read_gzip_header(fp) is None:
            return b"".join(decompressed_members)
        # Use a zlib raw deflate compressor
        do = zlib.decompressobj(wbits=-zlib.MAX_WBITS)
        # Read all the data except the header
        decompressed = do.decompress(data[fp.tell():])
        if not do.eof or len(do.unused_data) < 8:
            raise EOFError("Compressed file ended before the end-of-stream "
                           "marker was reached")
        crc, length = struct.unpack("<II", do.unused_data[:8])
        if crc != zlib.crc32(decompressed):
            raise BadGzipFile("CRC check failed")
        if length != (len(decompressed) & 0xffffffff):
            raise BadGzipFile("Incorrect length of data produced")
        decompressed_members.append(decompressed)
        data = do.unused_data[8:].lstrip(b"\x00")

def main():
    from argparse import ArgumentParser
    parser = ArgumentParser(description=
        "A simple command line interface for the gzip module: act like gzip, "
        "but do not delete the input file.")
    group = parser.add_mutually_exclusive_group()
    group.add_argument('--fast', action='store_true', help='compress faster')
    group.add_argument('--best', action='store_true', help='compress better')
    group.add_argument("-d", "--decompress", action="store_true",
                        help="act like gunzip instead of gzip")

parser.add_argument("args", nargs="*", default=["-"], metavar='file')
    args = parser.parse_args()

compresslevel = _COMPRESS_LEVEL_TRADEOFF
    if args.fast:
        compresslevel = _COMPRESS_LEVEL_FAST
    elif args.best:
        compresslevel = _COMPRESS_LEVEL_BEST

for arg in args.args:
        if args.decompress:
            if arg == "-":
                f = GzipFile(filename="", mode="rb", fileobj=sys.stdin.buffer)
                g = sys.stdout.buffer
            else:
                if arg[-3:] != ".gz":
                    sys.exit(f"filename doesn't end in .gz: {arg!r}")
                f = open(arg, "rb")
                g = builtins.open(arg[:-3], "wb")
        else:
            if arg == "-":
                f = sys.stdin.buffer
                g = GzipFile(filename="", mode="wb", fileobj=sys.stdout.buffer,
                             compresslevel=compresslevel)
            else:
                f = builtins.open(arg, "rb")
                g = open(arg + ".gz", "wb")
        while True:
            chunk = f.read(READ_BUFFER_SIZE)
            if not chunk:
                break
            g.write(chunk)
        if g is not sys.stdout.buffer:
            g.close()
        if f is not sys.stdin.buffer:
            f.close()

if __name__ == '__main__':
    main()

cmd: