17 lines
572 B
Python
17 lines
572 B
Python
|
tests = {
|
||
|
|
'webp': lambda h: h[0:4] == b'RIFF' and h[8:] == b'WEBP',
|
||
|
|
'png': lambda h: h[:8] == b'\211PNG\r\n\032\n',
|
||
|
|
'jpeg': lambda h: h[6:10] in (b'JFIF', b'Exif'),
|
||
|
|
'gif': lambda h: h[:6] in (b'GIF87a', b'GIF89a'),
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def what(file=None, h=None):
|
||
|
|
"""Detect format of image (Currently supports jpeg, png, webp, gif only)
|
||
|
|
Ref: https://github.com/python/cpython/blob/3.10/Lib/imghdr.py
|
||
|
|
"""
|
||
|
|
if h is None:
|
||
|
|
with open(file, 'rb') as f:
|
||
|
|
h = f.read(12)
|
||
|
|
return next((type_ for type_, test in tests.items() if test(h)), None)
|