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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
asyncio	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
collections	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
concurrent	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
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curses	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
dbm	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
distutils	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
email	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
encodings	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
ensurepip	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
html	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
http	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
importlib	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
json	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
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multiprocessing	[ DIR ]	drwxr-xr-x	2025-01-21 09:39
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LICENSE.txt	13.61 KB	-rw-r--r--	2024-12-03 17:27
__future__.py	5.03 KB	-rw-r--r--	2024-12-03 17:27
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datetime.py	86.02 KB	-rw-r--r--	2024-12-03 17:27
decimal.py	320 B	-rw-r--r--	2024-12-03 17:27
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fnmatch.py	6.56 KB	-rw-r--r--	2024-12-03 17:27
fractions.py	27.58 KB	-rw-r--r--	2024-12-03 17:27
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functools.py	37.18 KB	-rw-r--r--	2024-12-03 17:27
genericpath.py	4.86 KB	-rw-r--r--	2024-12-03 17:27
getopt.py	7.31 KB	-rw-r--r--	2024-12-03 17:27
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gettext.py	26.63 KB	-rw-r--r--	2024-12-03 17:27
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imghdr.py	3.72 KB	-rw-r--r--	2024-12-03 17:27
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inspect.py	121.46 KB	-rw-r--r--	2024-12-03 17:27
io.py	4.1 KB	-rw-r--r--	2024-12-03 17:27
ipaddress.py	76.71 KB	-rw-r--r--	2024-12-03 17:27
keyword.py	1.04 KB	-rw-r--r--	2024-12-03 17:27
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mailbox.py	76.95 KB	-rw-r--r--	2024-12-03 17:27
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modulefinder.py	23.83 KB	-rw-r--r--	2024-12-03 17:27
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ntpath.py	28.79 KB	-rw-r--r--	2024-12-03 17:27
nturl2path.py	2.82 KB	-rw-r--r--	2024-12-03 17:27
numbers.py	10.11 KB	-rw-r--r--	2024-12-03 17:27
opcode.py	5.76 KB	-rw-r--r--	2024-12-03 17:27
operator.py	10.5 KB	-rw-r--r--	2024-12-03 17:27
optparse.py	58.95 KB	-rw-r--r--	2024-12-03 17:27
os.py	38.63 KB	-rw-r--r--	2024-12-03 17:27
pathlib.py	48.41 KB	-rw-r--r--	2024-12-03 17:27
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pickle.py	63.43 KB	-rw-r--r--	2024-12-03 17:27
pickletools.py	91.29 KB	-rw-r--r--	2024-12-03 17:27
pipes.py	8.71 KB	-rw-r--r--	2024-12-03 17:27
pkgutil.py	24 KB	-rw-r--r--	2024-12-03 17:27
platform.py	41.05 KB	-rwxr-xr-x	2024-12-03 17:27
plistlib.py	27.69 KB	-rw-r--r--	2024-12-03 17:27
poplib.py	14.84 KB	-rw-r--r--	2024-12-03 17:27
posixpath.py	15.87 KB	-rw-r--r--	2024-12-03 17:27
pprint.py	23.87 KB	-rw-r--r--	2024-12-03 17:27
profile.py	22.36 KB	-rwxr-xr-x	2024-12-03 17:27
pstats.py	28.64 KB	-rw-r--r--	2024-12-03 17:27
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pyclbr.py	11.13 KB	-rw-r--r--	2024-12-03 17:27
pydoc.py	107.03 KB	-rwxr-xr-x	2024-12-03 17:27
queue.py	11.23 KB	-rw-r--r--	2024-12-03 17:27
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random.py	32.44 KB	-rw-r--r--	2024-12-03 17:27
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reprlib.py	5.14 KB	-rw-r--r--	2024-12-03 17:27
rlcompleter.py	7.63 KB	-rw-r--r--	2024-12-03 17:27
runpy.py	12.8 KB	-rw-r--r--	2024-12-03 17:27
sched.py	6.2 KB	-rw-r--r--	2024-12-03 17:27
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signal.py	2.38 KB	-rw-r--r--	2024-12-03 17:27
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sndhdr.py	6.93 KB	-rw-r--r--	2024-12-03 17:27
socket.py	36.14 KB	-rw-r--r--	2024-12-03 17:27
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sre_compile.py	27.32 KB	-rw-r--r--	2024-12-03 17:27
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statistics.py	42.19 KB	-rw-r--r--	2024-12-03 17:27
string.py	10.32 KB	-rw-r--r--	2024-12-03 17:27
stringprep.py	12.61 KB	-rw-r--r--	2024-12-03 17:27
struct.py	257 B	-rw-r--r--	2024-12-03 17:27
subprocess.py	82.93 KB	-rw-r--r--	2024-12-03 17:27
sunau.py	17.73 KB	-rw-r--r--	2024-12-03 17:27
symtable.py	9.98 KB	-rw-r--r--	2024-12-03 17:27
sysconfig.py	26.96 KB	-rw-r--r--	2024-12-03 17:27
tabnanny.py	11.05 KB	-rwxr-xr-x	2024-12-03 17:27
tarfile.py	105.13 KB	-rwxr-xr-x	2024-12-03 17:27
telnetlib.py	22.71 KB	-rw-r--r--	2024-12-03 17:27
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textwrap.py	19.31 KB	-rw-r--r--	2024-12-03 17:27
this.py	1003 B	-rw-r--r--	2024-12-03 17:27
threading.py	55.41 KB	-rw-r--r--	2025-01-09 16:01
timeit.py	13.19 KB	-rwxr-xr-x	2024-12-03 17:27
token.py	2.33 KB	-rw-r--r--	2024-12-03 17:27
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traceback.py	25.61 KB	-rw-r--r--	2024-12-03 17:27
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warnings.py	19.23 KB	-rw-r--r--	2024-12-03 17:27
wave.py	17.58 KB	-rw-r--r--	2024-12-03 17:27
weakref.py	21.05 KB	-rw-r--r--	2024-12-03 17:27
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zipapp.py	7.36 KB	-rw-r--r--	2024-12-03 17:27
zipfile.py	88.09 KB	-rw-r--r--	2024-12-03 17:27
zipimport.py	30.17 KB	-rw-r--r--	2024-12-03 17:27

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(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()