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File chunk.py

"""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.
"""

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
        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

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
..	DIR	-	dr-xr-xr-x	2025-10-21 10:57:26
__pycache__	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
asyncio	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
collections	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
concurrent	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
config-3.6m-x86_64-linux-gnu	DIR	-	drwxr-xr-x	2025-08-28 10:58:34
ctypes	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
curses	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
dbm	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
distutils	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
email	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
encodings	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
ensurepip	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
html	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
http	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
importlib	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
json	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
lib-dynload	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
lib2to3	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
logging	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
multiprocessing	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
pydoc_data	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
site-packages	DIR	-	drwxr-xr-x	2025-10-21 10:57:26
sqlite3	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
test	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
unittest	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
urllib	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
venv	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
wsgiref	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
xml	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
xmlrpc	DIR	-	drwxr-xr-x	2025-08-28 10:58:23
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threading.py	text/x-python	48.96 KB	-rw-r--r--	2025-08-26 08:58:55
timeit.py	text/plain	13.03 KB	-rwxr-xr-x	2018-12-23 09:37:14
token.py	text/plain	3 KB	-rw-r--r--	2018-12-23 09:37:14
tokenize.py	text/x-python	28.8 KB	-rw-r--r--	2018-12-23 09:37:14
trace.py	text/plain	28.06 KB	-rwxr-xr-x	2018-12-23 09:37:14
traceback.py	text/plain	22.91 KB	-rw-r--r--	2018-12-23 09:37:14
tracemalloc.py	text/x-python	16.27 KB	-rw-r--r--	2018-12-23 09:37:14
tty.py	text/x-python	879 B	-rw-r--r--	2018-12-23 09:37:14
types.py	text/plain	8.66 KB	-rw-r--r--	2018-12-23 09:37:14
typing.py	text/x-python	78.39 KB	-rw-r--r--	2018-12-23 09:37:14
uu.py	text/plain	6.6 KB	-rwxr-xr-x	2018-12-23 09:37:14
uuid.py	text/x-c++	23.46 KB	-rw-r--r--	2025-08-26 08:58:55
warnings.py	text/plain	18.05 KB	-rw-r--r--	2018-12-23 09:37:14
wave.py	text/x-python	17.29 KB	-rw-r--r--	2018-12-23 09:37:14
weakref.py	text/x-python	19.99 KB	-rw-r--r--	2018-12-23 09:37:14
webbrowser.py	text/plain	21.26 KB	-rwxr-xr-x	2018-12-23 09:37:14
xdrlib.py	text/x-python	5.77 KB	-rw-r--r--	2018-12-23 09:37:14
zipapp.py	text/x-python	6.99 KB	-rw-r--r--	2018-12-23 09:37:14
zipfile.py	text/plain	78.05 KB	-rw-r--r--	2025-08-26 08:58:55

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