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