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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
asyncio	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
collections	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
concurrent	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
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curses	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
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distutils	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
email	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
encodings	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
ensurepip	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
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idlelib	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
importlib	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
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test	[ DIR ]	drwxr-xr-x	2026-05-05 23:07
tkinter	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
tomllib	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
turtledemo	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
unittest	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
urllib	[ DIR ]	drwxr-xr-x	2026-05-05 23:06
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__future__.py	5.1 KB	-rw-r--r--	2026-03-03 04:22
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datetime.py	89.68 KB	-rw-r--r--	2026-03-03 04:22
decimal.py	320 B	-rw-r--r--	2026-03-03 04:22
difflib.py	81.36 KB	-rw-r--r--	2026-03-03 04:22
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doctest.py	103.81 KB	-rw-r--r--	2026-03-03 04:22
enum.py	77.72 KB	-rw-r--r--	2026-03-03 04:22
filecmp.py	9.94 KB	-rw-r--r--	2026-03-03 04:22
fileinput.py	15.35 KB	-rw-r--r--	2026-03-03 04:22
fnmatch.py	5.86 KB	-rw-r--r--	2026-03-03 04:22
fractions.py	28 KB	-rw-r--r--	2026-03-03 04:22
ftplib.py	34.98 KB	-rw-r--r--	2026-03-03 04:22
functools.py	37.51 KB	-rw-r--r--	2026-03-03 04:22
genericpath.py	5.12 KB	-rw-r--r--	2026-03-03 04:22
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gettext.py	20.82 KB	-rw-r--r--	2026-03-03 04:22
glob.py	8.53 KB	-rw-r--r--	2026-03-03 04:22
graphlib.py	9.43 KB	-rw-r--r--	2026-03-03 04:22
gzip.py	23.51 KB	-rw-r--r--	2026-03-03 04:22
hashlib.py	11.49 KB	-rw-r--r--	2026-03-03 04:22
heapq.py	22.48 KB	-rw-r--r--	2026-03-03 04:22
hmac.py	7.54 KB	-rw-r--r--	2026-03-03 04:22
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imghdr.py	3.86 KB	-rw-r--r--	2026-03-03 04:22
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linecache.py	5.52 KB	-rw-r--r--	2026-03-03 04:22
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mailbox.py	76.98 KB	-rw-r--r--	2026-03-03 04:22
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modulefinder.py	23.14 KB	-rw-r--r--	2026-03-03 04:22
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ntpath.py	28.09 KB	-rw-r--r--	2026-03-03 04:22
nturl2path.py	2.82 KB	-rw-r--r--	2026-03-03 04:22
numbers.py	10.11 KB	-rw-r--r--	2026-03-03 04:22
opcode.py	10.2 KB	-rw-r--r--	2026-03-03 04:22
operator.py	10.71 KB	-rw-r--r--	2026-03-03 04:22
optparse.py	58.95 KB	-rw-r--r--	2026-03-03 04:22
os.py	38.6 KB	-rw-r--r--	2026-03-03 04:22
pathlib.py	47.43 KB	-rw-r--r--	2026-03-03 04:22
pdb.py	62.68 KB	-rwxr-xr-x	2026-03-03 04:22
pickle.py	63.61 KB	-rw-r--r--	2026-03-03 04:22
pickletools.py	91.66 KB	-rw-r--r--	2026-03-03 04:22
pipes.py	8.77 KB	-rw-r--r--	2026-03-03 04:22
pkgutil.py	24.06 KB	-rw-r--r--	2026-03-03 04:22
platform.py	41.3 KB	-rwxr-xr-x	2026-03-03 04:22
plistlib.py	27.92 KB	-rw-r--r--	2026-03-03 04:22
poplib.py	14.84 KB	-rw-r--r--	2026-03-03 04:22
posixpath.py	16.67 KB	-rw-r--r--	2026-03-03 04:22
pprint.py	24.01 KB	-rw-r--r--	2026-03-03 04:22
profile.py	22.36 KB	-rwxr-xr-x	2026-03-03 04:22
pstats.py	28.67 KB	-rw-r--r--	2026-03-03 04:22
pty.py	6.17 KB	-rw-r--r--	2026-03-03 04:22
py_compile.py	7.65 KB	-rw-r--r--	2026-03-03 04:22
pyclbr.py	11.13 KB	-rw-r--r--	2026-03-03 04:22
pydoc.py	110.02 KB	-rwxr-xr-x	2026-03-03 04:22
queue.py	11.23 KB	-rw-r--r--	2026-03-03 04:22
quopri.py	7.11 KB	-rwxr-xr-x	2026-03-03 04:22
random.py	31.41 KB	-rw-r--r--	2026-03-03 04:22
reprlib.py	5.31 KB	-rw-r--r--	2026-03-03 04:22
rlcompleter.py	7.64 KB	-rw-r--r--	2026-03-03 04:22
runpy.py	12.85 KB	-rw-r--r--	2026-03-03 04:22
sched.py	6.2 KB	-rw-r--r--	2026-03-03 04:22
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shutil.py	55.19 KB	-rw-r--r--	2026-03-03 04:22
signal.py	2.44 KB	-rw-r--r--	2026-03-03 04:22
site.py	22.45 KB	-rw-r--r--	2026-03-03 04:22
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sndhdr.py	7.27 KB	-rw-r--r--	2026-03-03 04:22
socket.py	36.68 KB	-rw-r--r--	2026-03-03 04:22
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stat.py	5.36 KB	-rw-r--r--	2026-03-03 04:22
statistics.py	46.59 KB	-rw-r--r--	2026-03-03 04:22
string.py	11.51 KB	-rw-r--r--	2026-03-03 04:22
stringprep.py	12.61 KB	-rw-r--r--	2026-03-03 04:22
struct.py	257 B	-rw-r--r--	2026-03-03 04:22
subprocess.py	86.65 KB	-rw-r--r--	2026-03-03 04:22
sunau.py	18.05 KB	-rw-r--r--	2026-03-03 04:22
symtable.py	10.13 KB	-rw-r--r--	2026-03-03 04:22
sysconfig.py	29.6 KB	-rw-r--r--	2026-03-03 04:22
tabnanny.py	11.05 KB	-rwxr-xr-x	2026-03-03 04:22
tarfile.py	109.33 KB	-rwxr-xr-x	2026-03-03 04:22
telnetlib.py	22.75 KB	-rw-r--r--	2026-03-03 04:22
tempfile.py	31.13 KB	-rw-r--r--	2026-03-03 04:22
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this.py	1003 B	-rw-r--r--	2026-03-03 04:22
threading.py	56.87 KB	-rw-r--r--	2026-03-03 04:22
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traceback.py	39.6 KB	-rw-r--r--	2026-03-03 04:22
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typing.py	118.12 KB	-rw-r--r--	2026-03-03 04:22
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uuid.py	26.95 KB	-rw-r--r--	2026-03-03 04:22
warnings.py	20.62 KB	-rw-r--r--	2026-03-03 04:22
wave.py	21.31 KB	-rw-r--r--	2026-03-03 04:22
weakref.py	21.01 KB	-rw-r--r--	2026-03-03 04:22
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zipapp.py	7.36 KB	-rw-r--r--	2026-03-03 04:22
zipfile.py	92.23 KB	-rw-r--r--	2026-03-03 04:22
zipimport.py	30.17 KB	-rw-r--r--	2026-03-03 04:22

Rename

"""Recognize image file formats based on their first few bytes."""

from os import PathLike
import warnings

__all__ = ["what"]

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

#-------------------------#
# Recognize image headers #
#-------------------------#

def what(file, h=None):
    f = None
    try:
        if h is None:
            if isinstance(file, (str, PathLike)):
                f = open(file, 'rb')
                h = f.read(32)
            else:
                location = file.tell()
                h = file.read(32)
                file.seek(location)
        for tf in tests:
            res = tf(h, f)
            if res:
                return res
    finally:
        if f: f.close()
    return None

#---------------------------------#
# Subroutines per image file type #
#---------------------------------#

tests = []

def test_jpeg(h, f):
    """JPEG data with JFIF or Exif markers; and raw JPEG"""
    if h[6:10] in (b'JFIF', b'Exif'):
        return 'jpeg'
    elif h[:4] == b'\xff\xd8\xff\xdb':
        return 'jpeg'

tests.append(test_jpeg)

def test_png(h, f):
    if h.startswith(b'\211PNG\r\n\032\n'):
        return 'png'

tests.append(test_png)

def test_gif(h, f):
    """GIF ('87 and '89 variants)"""
    if h[:6] in (b'GIF87a', b'GIF89a'):
        return 'gif'

tests.append(test_gif)

def test_tiff(h, f):
    """TIFF (can be in Motorola or Intel byte order)"""
    if h[:2] in (b'MM', b'II'):
        return 'tiff'

tests.append(test_tiff)

def test_rgb(h, f):
    """SGI image library"""
    if h.startswith(b'\001\332'):
        return 'rgb'

tests.append(test_rgb)

def test_pbm(h, f):
    """PBM (portable bitmap)"""
    if len(h) >= 3 and \
        h[0] == ord(b'P') and h[1] in b'14' and h[2] in b' \t\n\r':
        return 'pbm'

tests.append(test_pbm)

def test_pgm(h, f):
    """PGM (portable graymap)"""
    if len(h) >= 3 and \
        h[0] == ord(b'P') and h[1] in b'25' and h[2] in b' \t\n\r':
        return 'pgm'

tests.append(test_pgm)

def test_ppm(h, f):
    """PPM (portable pixmap)"""
    if len(h) >= 3 and \
        h[0] == ord(b'P') and h[1] in b'36' and h[2] in b' \t\n\r':
        return 'ppm'

tests.append(test_ppm)

def test_rast(h, f):
    """Sun raster file"""
    if h.startswith(b'\x59\xA6\x6A\x95'):
        return 'rast'

tests.append(test_rast)

def test_xbm(h, f):
    """X bitmap (X10 or X11)"""
    if h.startswith(b'#define '):
        return 'xbm'

tests.append(test_xbm)

def test_bmp(h, f):
    if h.startswith(b'BM'):
        return 'bmp'

tests.append(test_bmp)

def test_webp(h, f):
    if h.startswith(b'RIFF') and h[8:12] == b'WEBP':
        return 'webp'

tests.append(test_webp)

def test_exr(h, f):
    if h.startswith(b'\x76\x2f\x31\x01'):
        return 'exr'

tests.append(test_exr)

#--------------------#
# Small test program #
#--------------------#

def test():
    import sys
    recursive = 0
    if sys.argv[1:] and sys.argv[1] == '-r':
        del sys.argv[1:2]
        recursive = 1
    try:
        if sys.argv[1:]:
            testall(sys.argv[1:], recursive, 1)
        else:
            testall(['.'], recursive, 1)
    except KeyboardInterrupt:
        sys.stderr.write('\n[Interrupted]\n')
        sys.exit(1)

def testall(list, recursive, toplevel):
    import sys
    import os
    for filename in list:
        if os.path.isdir(filename):
            print(filename + '/:', end=' ')
            if recursive or toplevel:
                print('recursing down:')
                import glob
                names = glob.glob(os.path.join(glob.escape(filename), '*'))
                testall(names, recursive, 0)
            else:
                print('*** directory (use -r) ***')
        else:
            print(filename + ':', end=' ')
            sys.stdout.flush()
            try:
                print(what(filename))
            except OSError:
                print('*** not found ***')

if __name__ == '__main__':
    test()