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asyncio	[ DIR ]	drwxr-xr-x
collections	[ DIR ]	drwxr-xr-x
concurrent	[ DIR ]	drwxr-xr-x
config-3.6m-x86_64-linux-gnu	[ DIR ]	drwxr-xr-x
ctypes	[ DIR ]	drwxr-xr-x
curses	[ DIR ]	drwxr-xr-x
dbm	[ DIR ]	drwxr-xr-x
distutils	[ DIR ]	drwxr-xr-x
email	[ DIR ]	drwxr-xr-x
encodings	[ DIR ]	drwxr-xr-x
ensurepip	[ DIR ]	drwxr-xr-x
html	[ DIR ]	drwxr-xr-x
http	[ DIR ]	drwxr-xr-x
importlib	[ DIR ]	drwxr-xr-x
json	[ DIR ]	drwxr-xr-x
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lib2to3	[ DIR ]	drwxr-xr-x
logging	[ DIR ]	drwxr-xr-x
multiprocessing	[ DIR ]	drwxr-xr-x
pydoc_data	[ DIR ]	drwxr-xr-x
site-packages	[ DIR ]	drwxr-xr-x
sqlite3	[ DIR ]	drwxr-xr-x
test	[ DIR ]	drwxr-xr-x
unittest	[ DIR ]	drwxr-xr-x
urllib	[ DIR ]	drwxr-xr-x
venv	[ DIR ]	drwxr-xr-x
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binhex.py	13.63 KB	-rw-r--r--
bisect.py	2.53 KB	-rw-r--r--
bz2.py	12.19 KB	-rw-r--r--
cProfile.py	5.24 KB	-rwxr-xr-x
calendar.py	22.67 KB	-rw-r--r--
cgi.py	35.93 KB	-rwxr-xr-x
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cmd.py	14.51 KB	-rw-r--r--
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codeop.py	5.85 KB	-rw-r--r--
colorsys.py	3.97 KB	-rw-r--r--
compileall.py	11.84 KB	-rw-r--r--
configparser.py	52.34 KB	-rw-r--r--
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copy.py	8.61 KB	-rw-r--r--
copyreg.py	6.84 KB	-rw-r--r--
crypt.py	1.82 KB	-rw-r--r--
csv.py	15.8 KB	-rw-r--r--
datetime.py	80.11 KB	-rw-r--r--
decimal.py	320 B	-rw-r--r--
difflib.py	82.4 KB	-rw-r--r--
dis.py	17.71 KB	-rw-r--r--
doctest.py	101.94 KB	-rw-r--r--
dummy_threading.py	2.75 KB	-rw-r--r--
enum.py	32.82 KB	-rw-r--r--
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fractions.py	23.08 KB	-rw-r--r--
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functools.py	30.61 KB	-rw-r--r--
genericpath.py	4.64 KB	-rw-r--r--
getopt.py	7.31 KB	-rw-r--r--
getpass.py	5.85 KB	-rw-r--r--
gettext.py	21.03 KB	-rw-r--r--
glob.py	5.51 KB	-rw-r--r--
gzip.py	19.86 KB	-rw-r--r--
hashlib.py	8.52 KB	-rw-r--r--
heapq.py	22.39 KB	-rw-r--r--
hmac.py	6.23 KB	-rw-r--r--
imaplib.py	52.05 KB	-rw-r--r--
imghdr.py	3.71 KB	-rw-r--r--
imp.py	10.42 KB	-rw-r--r--
inspect.py	114.22 KB	-rw-r--r--
io.py	3.43 KB	-rw-r--r--
ipaddress.py	72.82 KB	-rw-r--r--
keyword.py	2.16 KB	-rwxr-xr-x
linecache.py	5.19 KB	-rw-r--r--
locale.py	75.49 KB	-rw-r--r--
lzma.py	12.68 KB	-rw-r--r--
macpath.py	5.83 KB	-rw-r--r--
macurl2path.py	2.67 KB	-rw-r--r--
mailbox.py	76.78 KB	-rw-r--r--
mailcap.py	7.91 KB	-rw-r--r--
mimetypes.py	20.55 KB	-rw-r--r--
modulefinder.py	22.49 KB	-rw-r--r--
netrc.py	5.55 KB	-rw-r--r--
nntplib.py	42.07 KB	-rw-r--r--
ntpath.py	22.55 KB	-rw-r--r--
nturl2path.py	2.39 KB	-rw-r--r--
numbers.py	10 KB	-rw-r--r--
opcode.py	5.69 KB	-rw-r--r--
operator.py	10.61 KB	-rw-r--r--
optparse.py	58.96 KB	-rw-r--r--
os.py	36.65 KB	-rw-r--r--
pathlib.py	47.83 KB	-rw-r--r--
pdb.py	59.87 KB	-rwxr-xr-x
pickle.py	54.39 KB	-rw-r--r--
pickletools.py	89.62 KB	-rw-r--r--
pipes.py	8.71 KB	-rw-r--r--
pkgutil.py	20.82 KB	-rw-r--r--
platform.py	46.08 KB	-rwxr-xr-x
plistlib.py	32.02 KB	-rw-r--r--
poplib.py	14.61 KB	-rw-r--r--
posixpath.py	15.4 KB	-rw-r--r--
pprint.py	20.37 KB	-rw-r--r--
profile.py	21.5 KB	-rwxr-xr-x
pstats.py	25.94 KB	-rw-r--r--
pty.py	4.65 KB	-rw-r--r--
py_compile.py	7.01 KB	-rw-r--r--
pyclbr.py	13.24 KB	-rw-r--r--
pydoc.py	101.8 KB	-rw-r--r--
queue.py	8.57 KB	-rw-r--r--
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random.py	26.8 KB	-rw-r--r--
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reprlib.py	5.21 KB	-rw-r--r--
rlcompleter.py	6.93 KB	-rw-r--r--
runpy.py	11.68 KB	-rw-r--r--
sched.py	6.36 KB	-rw-r--r--
secrets.py	1.99 KB	-rw-r--r--
selectors.py	18.98 KB	-rw-r--r--
shelve.py	8.32 KB	-rw-r--r--
shlex.py	12.65 KB	-rw-r--r--
shutil.py	39.59 KB	-rw-r--r--
signal.py	2.07 KB	-rw-r--r--
site.py	20.77 KB	-rw-r--r--
smtpd.py	33.9 KB	-rwxr-xr-x
smtplib.py	43.17 KB	-rwxr-xr-x
sndhdr.py	6.92 KB	-rw-r--r--
socket.py	26.8 KB	-rw-r--r--
socketserver.py	26.38 KB	-rw-r--r--
sre_compile.py	18.88 KB	-rw-r--r--
sre_constants.py	6.66 KB	-rw-r--r--
sre_parse.py	35.68 KB	-rw-r--r--
ssl.py	43.47 KB	-rw-r--r--
stat.py	4.92 KB	-rw-r--r--
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string.py	11.52 KB	-rw-r--r--
stringprep.py	12.61 KB	-rw-r--r--
struct.py	257 B	-rw-r--r--
subprocess.py	60.88 KB	-rw-r--r--
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symbol.py	2.06 KB	-rwxr-xr-x
symtable.py	7.11 KB	-rw-r--r--
sysconfig.py	24.4 KB	-rw-r--r--
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tempfile.py	27.41 KB	-rw-r--r--
textwrap.py	19.1 KB	-rw-r--r--
this.py	1003 B	-rw-r--r--
threading.py	47.88 KB	-rw-r--r--
timeit.py	13.02 KB	-rwxr-xr-x
token.py	3 KB	-rw-r--r--
tokenize.py	28.8 KB	-rw-r--r--
trace.py	28.05 KB	-rwxr-xr-x
traceback.py	22.91 KB	-rw-r--r--
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tty.py	879 B	-rw-r--r--
types.py	8.66 KB	-rw-r--r--
typing.py	78.39 KB	-rw-r--r--
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uuid.py	23.46 KB	-rw-r--r--
warnings.py	18.05 KB	-rw-r--r--
wave.py	17.29 KB	-rw-r--r--
weakref.py	19.99 KB	-rw-r--r--
webbrowser.py	21.25 KB	-rwxr-xr-x
xdrlib.py	5.77 KB	-rw-r--r--
zipapp.py	6.99 KB	-rw-r--r--
zipfile.py	74.49 KB	-rw-r--r--

Code Editor : _compression.py

"""Internal classes used by the gzip, lzma and bz2 modules"""

import io

BUFFER_SIZE = io.DEFAULT_BUFFER_SIZE  # Compressed data read chunk size

class BaseStream(io.BufferedIOBase):
    """Mode-checking helper functions."""

def _check_not_closed(self):
        if self.closed:
            raise ValueError("I/O operation on closed file")

def _check_can_read(self):
        if not self.readable():
            raise io.UnsupportedOperation("File not open for reading")

def _check_can_write(self):
        if not self.writable():
            raise io.UnsupportedOperation("File not open for writing")

def _check_can_seek(self):
        if not self.readable():
            raise io.UnsupportedOperation("Seeking is only supported "
                                          "on files open for reading")
        if not self.seekable():
            raise io.UnsupportedOperation("The underlying file object "
                                          "does not support seeking")

class DecompressReader(io.RawIOBase):
    """Adapts the decompressor API to a RawIOBase reader API"""

def readable(self):
        return True

def __init__(self, fp, decomp_factory, trailing_error=(), **decomp_args):
        self._fp = fp
        self._eof = False
        self._pos = 0  # Current offset in decompressed stream

# Set to size of decompressed stream once it is known, for SEEK_END
        self._size = -1

# Save the decompressor factory and arguments.
        # If the file contains multiple compressed streams, each
        # stream will need a separate decompressor object. A new decompressor
        # object is also needed when implementing a backwards seek().
        self._decomp_factory = decomp_factory
        self._decomp_args = decomp_args
        self._decompressor = self._decomp_factory(**self._decomp_args)

# Exception class to catch from decompressor signifying invalid
        # trailing data to ignore
        self._trailing_error = trailing_error

def close(self):
        self._decompressor = None
        return super().close()

def seekable(self):
        return self._fp.seekable()

def readinto(self, b):
        with memoryview(b) as view, view.cast("B") as byte_view:
            data = self.read(len(byte_view))
            byte_view[:len(data)] = data
        return len(data)

def read(self, size=-1):
        if size < 0:
            return self.readall()

if not size or self._eof:
            return b""
        data = None  # Default if EOF is encountered
        # Depending on the input data, our call to the decompressor may not
        # return any data. In this case, try again after reading another block.
        while True:
            if self._decompressor.eof:
                rawblock = (self._decompressor.unused_data or
                            self._fp.read(BUFFER_SIZE))
                if not rawblock:
                    break
                # Continue to next stream.
                self._decompressor = self._decomp_factory(
                    **self._decomp_args)
                try:
                    data = self._decompressor.decompress(rawblock, size)
                except self._trailing_error:
                    # Trailing data isn't a valid compressed stream; ignore it.
                    break
            else:
                if self._decompressor.needs_input:
                    rawblock = self._fp.read(BUFFER_SIZE)
                    if not rawblock:
                        raise EOFError("Compressed file ended before the "
                                       "end-of-stream marker was reached")
                else:
                    rawblock = b""
                data = self._decompressor.decompress(rawblock, size)
            if data:
                break
        if not data:
            self._eof = True
            self._size = self._pos
            return b""
        self._pos += len(data)
        return data

# Rewind the file to the beginning of the data stream.
    def _rewind(self):
        self._fp.seek(0)
        self._eof = False
        self._pos = 0
        self._decompressor = self._decomp_factory(**self._decomp_args)

def seek(self, offset, whence=io.SEEK_SET):
        # Recalculate offset as an absolute file position.
        if whence == io.SEEK_SET:
            pass
        elif whence == io.SEEK_CUR:
            offset = self._pos + offset
        elif whence == io.SEEK_END:
            # Seeking relative to EOF - we need to know the file's size.
            if self._size < 0:
                while self.read(io.DEFAULT_BUFFER_SIZE):
                    pass
            offset = self._size + offset
        else:
            raise ValueError("Invalid value for whence: {}".format(whence))

# Make it so that offset is the number of bytes to skip forward.
        if offset < self._pos:
            self._rewind()
        else:
            offset -= self._pos

# Read and discard data until we reach the desired position.
        while offset > 0:
            data = self.read(min(io.DEFAULT_BUFFER_SIZE, offset))
            if not data:
                break
            offset -= len(data)

return self._pos

def tell(self):
        """Return the current file position."""
        return self._pos