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Name	Type	Size	Permissions	Modified	Actions
..	Parent	-	drwxr-xr-x	2026-04-10 04:18:08	-
__phello__	Folder	-	0755	2026-04-10 04:18:08
__pycache__	Folder	-	0755	2026-04-10 04:18:08
asyncio	Folder	-	0755	2026-04-10 04:18:08
collections	Folder	-	0755	2026-04-10 04:18:08
concurrent	Folder	-	0755	2026-04-10 04:18:08
ctypes	Folder	-	0755	2026-04-10 04:18:08
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dbm	Folder	-	0755	2026-04-10 04:18:08
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logging	Folder	-	0755	2026-04-10 04:18:08
multiprocessing	Folder	-	0755	2026-04-10 04:18:08
pydoc_data	Folder	-	0755	2026-04-10 04:18:08
re	Folder	-	0755	2026-04-10 04:18:08
sqlite3	Folder	-	0755	2026-04-10 04:18:08
test	Folder	-	0755	2026-04-10 04:18:08
tomllib	Folder	-	0755	2026-04-10 04:18:08
unittest	Folder	-	0755	2026-04-10 04:18:08
urllib	Folder	-	0755	2026-04-10 04:18:08
venv	Folder	-	0755	2026-04-10 04:18:08
wsgiref	Folder	-	0755	2026-04-10 04:18:08
xml	Folder	-	0755	2026-04-10 04:18:08
xmlrpc	Folder	-	0755	2026-04-10 04:18:08
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EXTERNALLY-MANAGED	File	645 B	0644	2026-03-03 12:15:18
LICENSE.txt	File	13.61 KB	0644	2026-03-03 12:15:18
__future__.py	File	5.1 KB	0644	2026-03-03 12:15:18
__hello__.py	File	227 B	0644	2026-03-03 12:15:18
_aix_support.py	File	3.93 KB	0644	2026-03-03 12:15:18
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_compat_pickle.py	File	8.56 KB	0644	2026-03-03 12:15:18
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abc.py	File	6.38 KB	0644	2026-03-03 12:15:18
aifc.py	File	33.41 KB	0644	2026-03-03 12:15:18
antigravity.py	File	500 B	0644	2026-03-03 12:15:18
argparse.py	File	99.37 KB	0644	2026-03-03 12:15:18
ast.py	File	62.75 KB	0644	2026-03-03 12:15:18
base64.py	File	20.12 KB	0755	2026-03-03 12:15:18
bdb.py	File	31.7 KB	0644	2026-03-03 12:15:18
bisect.py	File	3.34 KB	0644	2026-03-03 12:15:18
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cProfile.py	File	6.4 KB	0755	2026-03-03 12:15:18
calendar.py	File	24.82 KB	0644	2026-03-03 12:15:18
cgi.py	File	33.61 KB	0755	2026-03-03 12:15:18
cgitb.py	File	12.13 KB	0644	2026-03-03 12:15:18
chunk.py	File	5.37 KB	0644	2026-03-03 12:15:18
cmd.py	File	14.52 KB	0644	2026-03-03 12:15:18
code.py	File	10.44 KB	0644	2026-03-03 12:15:18
codecs.py	File	36.01 KB	0644	2026-03-03 12:15:18
codeop.py	File	5.77 KB	0644	2026-03-03 12:15:18
colorsys.py	File	3.97 KB	0644	2026-03-03 12:15:18
compileall.py	File	20.12 KB	0644	2026-03-03 12:15:18
configparser.py	File	52.53 KB	0644	2026-03-03 12:15:18
contextlib.py	File	26.99 KB	0644	2026-03-03 12:15:18
contextvars.py	File	129 B	0644	2026-03-03 12:15:18
copy.py	File	8.21 KB	0644	2026-03-03 12:15:18
copyreg.py	File	7.44 KB	0644	2026-03-03 12:15:18
crypt.py	File	3.82 KB	0644	2026-03-03 12:15:18
csv.py	File	16 KB	0644	2026-03-03 12:15:18
dataclasses.py	File	60.31 KB	0644	2026-03-03 12:15:18
datetime.py	File	268 B	0644	2026-03-03 12:15:18
decimal.py	File	320 B	0644	2026-03-03 12:15:18
difflib.py	File	81.36 KB	0644	2026-03-03 12:15:18
dis.py	File	29.5 KB	0644	2026-03-03 12:15:18
doctest.py	File	103.98 KB	0644	2026-03-03 12:15:18
enum.py	File	79.72 KB	0644	2026-03-03 12:15:18
filecmp.py	File	9.95 KB	0644	2026-03-03 12:15:18
fileinput.py	File	15.35 KB	0644	2026-03-03 12:15:18
fnmatch.py	File	5.86 KB	0644	2026-03-03 12:15:18
fractions.py	File	37.17 KB	0644	2026-03-03 12:15:18
ftplib.py	File	33.92 KB	0644	2026-03-03 12:15:18
functools.py	File	37.23 KB	0644	2026-03-03 12:15:18
genericpath.py	File	5.44 KB	0644	2026-03-03 12:15:18
getopt.py	File	7.31 KB	0644	2026-03-03 12:15:18
getpass.py	File	5.85 KB	0644	2026-03-03 12:15:18
gettext.py	File	21.24 KB	0644	2026-03-03 12:15:18
glob.py	File	8.53 KB	0644	2026-03-03 12:15:18
graphlib.py	File	9.43 KB	0644	2026-03-03 12:15:18
gzip.py	File	24.28 KB	0644	2026-03-03 12:15:18
hashlib.py	File	9.13 KB	0644	2026-03-03 12:15:18
heapq.py	File	22.48 KB	0644	2026-03-03 12:15:18
hmac.py	File	7.54 KB	0644	2026-03-03 12:15:18
imaplib.py	File	52.43 KB	0644	2026-03-03 12:15:18
imghdr.py	File	4.29 KB	0644	2026-03-03 12:15:18
inspect.py	File	122.48 KB	0644	2026-03-03 12:15:18
io.py	File	3.5 KB	0644	2026-03-03 12:15:18
ipaddress.py	File	76.46 KB	0644	2026-03-03 12:15:18
keyword.py	File	1.05 KB	0644	2026-03-03 12:15:18
linecache.py	File	5.52 KB	0644	2026-03-03 12:15:18
locale.py	File	76.72 KB	0644	2026-03-03 12:15:18
lzma.py	File	12.97 KB	0644	2026-03-03 12:15:18
mailbox.py	File	77.06 KB	0644	2026-03-03 12:15:18
mailcap.py	File	9.11 KB	0644	2026-03-03 12:15:18
mimetypes.py	File	22.35 KB	0644	2026-03-03 12:15:18
modulefinder.py	File	23.14 KB	0644	2026-03-03 12:15:18
netrc.py	File	6.76 KB	0644	2026-03-03 12:15:18
nntplib.py	File	40.12 KB	0644	2026-03-03 12:15:18
ntpath.py	File	29.32 KB	0644	2026-03-03 12:15:18
nturl2path.py	File	2.82 KB	0644	2026-03-03 12:15:18
numbers.py	File	11.2 KB	0644	2026-03-03 12:15:18
opcode.py	File	12.87 KB	0644	2026-03-03 12:15:18
operator.py	File	10.71 KB	0644	2026-03-03 12:15:18
optparse.py	File	58.95 KB	0644	2026-03-03 12:15:18
os.py	File	38.85 KB	0644	2026-03-03 12:15:18
pathlib.py	File	49.95 KB	0644	2026-03-03 12:15:18
pdb.py	File	67.83 KB	0755	2026-03-03 12:15:18
pickle.py	File	63.38 KB	0644	2026-03-03 12:15:18
pickletools.py	File	91.66 KB	0644	2026-03-03 12:15:18
pipes.py	File	8.77 KB	0644	2026-03-03 12:15:18
pkgutil.py	File	17.85 KB	0644	2026-03-03 12:15:18
platform.py	File	42.32 KB	0755	2026-03-03 12:15:18
plistlib.py	File	27.91 KB	0644	2026-03-03 12:15:18
poplib.py	File	13.83 KB	0644	2026-03-03 12:15:18
posixpath.py	File	17.21 KB	0644	2026-03-03 12:15:18
pprint.py	File	23.59 KB	0644	2026-03-03 12:15:18
profile.py	File	22.55 KB	0755	2026-03-03 12:15:18
pstats.py	File	28.6 KB	0644	2026-03-03 12:15:18
pty.py	File	5.99 KB	0644	2026-03-03 12:15:18
py_compile.py	File	7.69 KB	0644	2026-03-03 12:15:18
pyclbr.py	File	11.13 KB	0644	2026-03-03 12:15:18
pydoc.py	File	110.44 KB	0755	2026-03-03 12:15:18
queue.py	File	11.23 KB	0644	2026-03-03 12:15:18
quopri.py	File	7.01 KB	0755	2026-03-03 12:15:18
random.py	File	33.87 KB	0644	2026-03-03 12:15:18
reprlib.py	File	6.42 KB	0644	2026-03-03 12:15:18
rlcompleter.py	File	7.64 KB	0644	2026-03-03 12:15:18
runpy.py	File	12.6 KB	0644	2026-03-03 12:15:18
sched.py	File	6.2 KB	0644	2026-03-03 12:15:18
secrets.py	File	1.94 KB	0644	2026-03-03 12:15:18
selectors.py	File	19.21 KB	0644	2026-03-03 12:15:18
shelve.py	File	8.36 KB	0644	2026-03-03 12:15:18
shlex.py	File	13.04 KB	0644	2026-03-03 12:15:18
shutil.py	File	56.76 KB	0644	2026-03-03 12:15:18
signal.py	File	2.44 KB	0644	2026-03-03 12:15:18
site.py	File	23.34 KB	0644	2026-03-03 12:15:18
sitecustomize.py	File	0 B	0	1970-01-01 00:00:00
smtplib.py	File	42.51 KB	0755	2026-03-03 12:15:18
sndhdr.py	File	7.27 KB	0644	2026-03-03 12:15:18
socket.py	File	36.53 KB	0644	2026-03-03 12:15:18
socketserver.py	File	27.2 KB	0644	2026-03-03 12:15:18
sre_compile.py	File	231 B	0644	2026-03-03 12:15:18
sre_constants.py	File	232 B	0644	2026-03-03 12:15:18
sre_parse.py	File	229 B	0644	2026-03-03 12:15:18
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stat.py	File	5.36 KB	0644	2026-03-03 12:15:18
statistics.py	File	49.05 KB	0644	2026-03-03 12:15:18
string.py	File	11.51 KB	0644	2026-03-03 12:15:18
stringprep.py	File	12.61 KB	0644	2026-03-03 12:15:18
struct.py	File	257 B	0644	2026-03-03 12:15:18
subprocess.py	File	86.65 KB	0644	2026-03-03 12:15:18
sunau.py	File	18.04 KB	0644	2026-03-03 12:15:18
symtable.py	File	10.5 KB	0644	2026-03-03 12:15:18
sysconfig.py	File	32 KB	0644	2026-03-03 12:15:18
tabnanny.py	File	11.26 KB	0755	2026-03-03 12:15:18
tarfile.py	File	109.92 KB	0755	2026-03-03 12:15:18
telnetlib.py	File	22.75 KB	0644	2026-03-03 12:15:18
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threading.py	File	58.71 KB	0644	2026-03-03 12:15:18
timeit.py	File	13.15 KB	0755	2026-03-03 12:15:18
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traceback.py	File	45.24 KB	0644	2026-03-03 12:15:18
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typing.py	File	114.68 KB	0644	2026-03-03 12:15:18
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warnings.py	File	21.25 KB	0644	2026-03-03 12:15:18
wave.py	File	22.24 KB	0644	2026-03-03 12:15:18
weakref.py	File	21.01 KB	0644	2026-03-03 12:15:18
webbrowser.py	File	23.07 KB	0755	2026-03-03 12:15:18
xdrlib.py	File	5.8 KB	0644	2026-03-03 12:15:18
zipapp.py	File	7.37 KB	0644	2026-03-03 12:15:18
zipimport.py	File	27.47 KB	0644	2026-03-03 12:15:18

"""Simple class to read IFF chunks.

An IFF chunk (used in formats such as AIFF, TIFF, RMFF (RealMedia File
Format)) has the following structure:

+----------------+
| ID (4 bytes)   |
+----------------+
| size (4 bytes) |
+----------------+
| data           |
| ...            |
+----------------+

The ID is a 4-byte string which identifies the type of chunk.

The size field (a 32-bit value, encoded using big-endian byte order)
gives the size of the whole chunk, including the 8-byte header.

Usually an IFF-type file consists of one or more chunks.  The proposed
usage of the Chunk class defined here is to instantiate an instance at
the start of each chunk and read from the instance until it reaches
the end, after which a new instance can be instantiated.  At the end
of the file, creating a new instance will fail with an EOFError
exception.

Usage:
while True:
    try:
        chunk = Chunk(file)
    except EOFError:
        break
    chunktype = chunk.getname()
    while True:
        data = chunk.read(nbytes)
        if not data:
            pass
        # do something with data

The interface is file-like.  The implemented methods are:
read, close, seek, tell, isatty.
Extra methods are: skip() (called by close, skips to the end of the chunk),
getname() (returns the name (ID) of the chunk)

The __init__ method has one required argument, a file-like object
(including a chunk instance), and one optional argument, a flag which
specifies whether or not chunks are aligned on 2-byte boundaries.  The
default is 1, i.e. aligned.
"""

import warnings

warnings._deprecated(__name__, remove=(3, 13))

class Chunk:
    def __init__(self, file, align=True, bigendian=True, inclheader=False):
        import struct
        self.closed = False
        self.align = align      # whether to align to word (2-byte) boundaries
        if bigendian:
            strflag = '>'
        else:
            strflag = '<'
        self.file = file
        self.chunkname = file.read(4)
        if len(self.chunkname) < 4:
            raise EOFError
        try:
            self.chunksize = struct.unpack_from(strflag+'L', file.read(4))[0]
        except struct.error:
            raise EOFError from None
        if inclheader:
            self.chunksize = self.chunksize - 8 # subtract header
        self.size_read = 0
        try:
            self.offset = self.file.tell()
        except (AttributeError, OSError):
            self.seekable = False
        else:
            self.seekable = True

def getname(self):
        """Return the name (ID) of the current chunk."""
        return self.chunkname

def getsize(self):
        """Return the size of the current chunk."""
        return self.chunksize

def close(self):
        if not self.closed:
            try:
                self.skip()
            finally:
                self.closed = True

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

def seek(self, pos, whence=0):
        """Seek to specified position into the chunk.
        Default position is 0 (start of chunk).
        If the file is not seekable, this will result in an error.
        """

if self.closed:
            raise ValueError("I/O operation on closed file")
        if not self.seekable:
            raise OSError("cannot seek")
        if whence == 1:
            pos = pos + self.size_read
        elif whence == 2:
            pos = pos + self.chunksize
        if pos < 0 or pos > self.chunksize:
            raise RuntimeError
        self.file.seek(self.offset + pos, 0)
        self.size_read = pos

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

def read(self, size=-1):
        """Read at most size bytes from the chunk.
        If size is omitted or negative, read until the end
        of the chunk.
        """

if self.closed:
            raise ValueError("I/O operation on closed file")
        if self.size_read >= self.chunksize:
            return b''
        if size < 0:
            size = self.chunksize - self.size_read
        if size > self.chunksize - self.size_read:
            size = self.chunksize - self.size_read
        data = self.file.read(size)
        self.size_read = self.size_read + len(data)
        if self.size_read == self.chunksize and \
           self.align and \
           (self.chunksize & 1):
            dummy = self.file.read(1)
            self.size_read = self.size_read + len(dummy)
        return data

def skip(self):
        """Skip the rest of the chunk.
        If you are not interested in the contents of the chunk,
        this method should be called so that the file points to
        the start of the next chunk.
        """

if self.closed:
            raise ValueError("I/O operation on closed file")
        if self.seekable:
            try:
                n = self.chunksize - self.size_read
                # maybe fix alignment
                if self.align and (self.chunksize & 1):
                    n = n + 1
                self.file.seek(n, 1)
                self.size_read = self.size_read + n
                return
            except OSError:
                pass
        while self.size_read < self.chunksize:
            n = min(8192, self.chunksize - self.size_read)
            dummy = self.read(n)
            if not dummy:
                raise EOFError

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