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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
asyncio	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
collections	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
concurrent	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
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ctypes	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
curses	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
dbm	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
distutils	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
email	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
encodings	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
ensurepip	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
html	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
http	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
idlelib	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
importlib	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
json	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
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multiprocessing	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
pydoc_data	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
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test	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
unittest	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
urllib	[ DIR ]	drwxr-xr-x	2026-02-18 15:08
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datetime.py	84.52 KB	-rw-r--r--	2024-04-17 23:06
decimal.py	320 B	-rw-r--r--	2024-04-17 23:06
difflib.py	82.42 KB	-rw-r--r--	2024-04-17 23:06
dis.py	19.42 KB	-rw-r--r--	2024-04-17 23:06
doctest.py	102.11 KB	-rw-r--r--	2024-04-17 23:06
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enum.py	34.22 KB	-rw-r--r--	2024-04-17 23:06
filecmp.py	9.6 KB	-rw-r--r--	2024-04-17 23:06
fileinput.py	14.28 KB	-rw-r--r--	2024-04-17 23:06
fnmatch.py	3.96 KB	-rw-r--r--	2024-04-17 23:06
formatter.py	14.79 KB	-rw-r--r--	2024-04-17 23:06
fractions.py	23.2 KB	-rw-r--r--	2024-04-17 23:06
ftplib.py	34.78 KB	-rw-r--r--	2024-04-17 23:06
functools.py	32.16 KB	-rw-r--r--	2024-04-17 23:06
genericpath.py	4.8 KB	-rw-r--r--	2024-04-17 23:06
getopt.py	7.31 KB	-rw-r--r--	2024-04-17 23:06
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glob.py	5.51 KB	-rw-r--r--	2024-04-17 23:06
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hashlib.py	9.31 KB	-rw-r--r--	2024-04-17 23:06
heapq.py	22.48 KB	-rw-r--r--	2024-04-17 23:06
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imghdr.py	3.71 KB	-rw-r--r--	2024-04-17 23:06
imp.py	10.29 KB	-rw-r--r--	2024-04-17 23:06
inspect.py	114.88 KB	-rw-r--r--	2024-04-17 23:06
io.py	3.43 KB	-rw-r--r--	2024-04-17 23:06
ipaddress.py	71.85 KB	-rw-r--r--	2024-04-17 23:06
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linecache.py	5.21 KB	-rw-r--r--	2024-04-17 23:06
locale.py	76.36 KB	-rw-r--r--	2024-04-17 23:06
lzma.py	12.68 KB	-rw-r--r--	2024-04-17 23:06
macpath.py	5.98 KB	-rw-r--r--	2024-04-17 23:06
mailbox.py	76.81 KB	-rw-r--r--	2024-04-17 23:06
mailcap.py	8.85 KB	-rw-r--r--	2024-04-17 23:06
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modulefinder.py	22.5 KB	-rw-r--r--	2024-04-17 23:06
netrc.py	5.44 KB	-rw-r--r--	2024-04-17 23:06
nntplib.py	42.08 KB	-rw-r--r--	2024-04-17 23:06
ntpath.py	21.82 KB	-rw-r--r--	2024-04-17 23:06
nturl2path.py	2.52 KB	-rw-r--r--	2024-04-17 23:06
numbers.py	10 KB	-rw-r--r--	2024-04-17 23:06
opcode.py	5.69 KB	-rw-r--r--	2024-04-17 23:06
operator.py	10.61 KB	-rw-r--r--	2024-04-17 23:06
optparse.py	58.96 KB	-rw-r--r--	2024-04-17 23:06
os.py	37.01 KB	-rw-r--r--	2024-04-17 23:06
pathlib.py	49.15 KB	-rw-r--r--	2024-04-17 23:06
pdb.py	61.04 KB	-rwxr-xr-x	2024-04-17 23:06
pickle.py	56.63 KB	-rw-r--r--	2024-04-17 23:06
pickletools.py	89.08 KB	-rw-r--r--	2024-04-17 23:06
pipes.py	8.71 KB	-rw-r--r--	2024-04-17 23:06
pkgutil.py	20.96 KB	-rw-r--r--	2024-04-17 23:06
platform.py	45.89 KB	-rwxr-xr-x	2024-04-17 23:06
plistlib.py	29.99 KB	-rw-r--r--	2024-04-17 23:06
poplib.py	14.61 KB	-rw-r--r--	2024-04-17 23:06
posixpath.py	15.4 KB	-rw-r--r--	2024-04-17 23:06
pprint.py	20.39 KB	-rw-r--r--	2024-04-17 23:06
profile.py	21.97 KB	-rwxr-xr-x	2024-04-17 23:06
pstats.py	26.67 KB	-rw-r--r--	2024-04-17 23:06
pty.py	4.65 KB	-rw-r--r--	2024-04-17 23:06
py_compile.py	7.81 KB	-rw-r--r--	2024-04-17 23:06
pyclbr.py	14.78 KB	-rw-r--r--	2024-04-17 23:06
pydoc.py	103.39 KB	-rw-r--r--	2024-04-17 23:06
queue.py	11.09 KB	-rw-r--r--	2024-04-17 23:06
quopri.py	7.09 KB	-rwxr-xr-x	2024-04-17 23:06
random.py	26.91 KB	-rw-r--r--	2024-04-17 23:06
re.py	14.95 KB	-rw-r--r--	2024-04-17 23:06
reprlib.py	5.14 KB	-rw-r--r--	2024-04-17 23:06
rlcompleter.py	6.93 KB	-rw-r--r--	2024-04-17 23:06
runpy.py	11.68 KB	-rw-r--r--	2024-04-17 23:06
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signal.py	2.07 KB	-rw-r--r--	2024-04-17 23:06
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sndhdr.py	6.92 KB	-rw-r--r--	2024-04-17 23:06
socket.py	26.83 KB	-rw-r--r--	2024-04-17 23:06
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ssl.py	44.43 KB	-rw-r--r--	2024-04-17 23:06
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statistics.py	20.17 KB	-rw-r--r--	2024-04-17 23:06
string.py	11.29 KB	-rw-r--r--	2024-04-17 23:06
stringprep.py	12.61 KB	-rw-r--r--	2024-04-17 23:06
struct.py	257 B	-rw-r--r--	2024-04-17 23:06
subprocess.py	70.95 KB	-rw-r--r--	2024-04-17 23:06
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symbol.py	2.09 KB	-rwxr-xr-x	2024-04-17 23:06
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tabnanny.py	11.15 KB	-rwxr-xr-x	2024-04-17 23:06
tarfile.py	90.5 KB	-rwxr-xr-x	2024-04-17 23:06
telnetlib.py	22.59 KB	-rw-r--r--	2024-04-17 23:06
tempfile.py	26.1 KB	-rw-r--r--	2024-04-17 23:06
textwrap.py	18.95 KB	-rw-r--r--	2024-04-17 23:06
this.py	1003 B	-rw-r--r--	2024-04-17 23:06
threading.py	48.13 KB	-rw-r--r--	2024-04-17 23:06
timeit.py	13.18 KB	-rwxr-xr-x	2024-04-17 23:06
token.py	3.67 KB	-rw-r--r--	2024-04-17 23:06
tokenize.py	26.4 KB	-rw-r--r--	2024-04-17 23:06
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traceback.py	22.89 KB	-rw-r--r--	2024-04-17 23:06
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uuid.py	28.83 KB	-rw-r--r--	2024-04-17 23:06
warnings.py	19.61 KB	-rw-r--r--	2024-04-17 23:06
wave.py	17.8 KB	-rw-r--r--	2024-04-17 23:06
weakref.py	21 KB	-rw-r--r--	2024-04-17 23:06
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xdrlib.py	5.77 KB	-rw-r--r--	2024-04-17 23:06
zipapp.py	7.36 KB	-rw-r--r--	2024-04-17 23:06
zipfile.py	79.19 KB	-rw-r--r--	2024-04-17 23:06

Rename

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

from os import PathLike

__all__ = ["what"]

#-------------------------#
# 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 in JFIF or Exif format"""
    if h[6:10] in (b'JFIF', b'Exif'):
        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(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()