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Added standard imghdr implementation to replace deleted module. #7002
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,175 @@ | ||
"""Recognize image file formats based on their first few bytes.""" | ||
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from os import PathLike | ||
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__all__ = ["what"] | ||
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#-------------------------# | ||
# Recognize image headers # | ||
#-------------------------# | ||
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def what(file, h=None): | ||
"""Return the type of image contained in a file or byte stream.""" | ||
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 | ||
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#---------------------------------# | ||
# Subroutines per image file type # | ||
#---------------------------------# | ||
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tests = [] | ||
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def test_jpeg(h, f): | ||
"""Test for 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' | ||
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tests.append(test_jpeg) | ||
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def test_png(h, f): | ||
"""Verify if the image is a PNG.""" | ||
if h.startswith(b'\211PNG\r\n\032\n'): | ||
return 'png' | ||
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tests.append(test_png) | ||
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def test_gif(h, f): | ||
"""Verify if the image is a GIF ('87 or '89 variants).""" | ||
if h[:6] in (b'GIF87a', b'GIF89a'): | ||
return 'gif' | ||
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tests.append(test_gif) | ||
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def test_tiff(h, f): | ||
"""Verify if the image is a TIFF (can be in Motorola or Intel byte order).""" | ||
if h[:2] in (b'MM', b'II'): | ||
return 'tiff' | ||
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tests.append(test_tiff) | ||
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def test_rgb(h, f): | ||
"""test for the SGI image library.""" | ||
if h.startswith(b'\001\332'): | ||
return 'rgb' | ||
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tests.append(test_rgb) | ||
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def test_pbm(h, f): | ||
"""Verify if the image is a 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' | ||
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tests.append(test_pbm) | ||
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def test_pgm(h, f): | ||
"""Verify if the image is a 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' | ||
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tests.append(test_pgm) | ||
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def test_ppm(h, f): | ||
"""Verify if the image is a 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' | ||
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tests.append(test_ppm) | ||
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def test_rast(h, f): | ||
"""test for the Sun raster file.""" | ||
if h.startswith(b'\x59\xA6\x6A\x95'): | ||
return 'rast' | ||
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tests.append(test_rast) | ||
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def test_xbm(h, f): | ||
"""Verify if the image is a X bitmap (X10 or X11).""" | ||
if h.startswith(b'#define '): | ||
return 'xbm' | ||
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tests.append(test_xbm) | ||
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def test_bmp(h, f): | ||
"""Verify if the image is a BMP file.""" | ||
if h.startswith(b'BM'): | ||
return 'bmp' | ||
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tests.append(test_bmp) | ||
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def test_webp(h, f): | ||
"""Verify if the image is a WebP.""" | ||
if h.startswith(b'RIFF') and h[8:12] == b'WEBP': | ||
return 'webp' | ||
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tests.append(test_webp) | ||
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def test_exr(h, f): | ||
"""verify is the image ia a OpenEXR fileOpenEXR.""" | ||
if h.startswith(b'\x76\x2f\x31\x01'): | ||
return 'exr' | ||
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tests.append(test_exr) | ||
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#--------------------# | ||
# Small test program # | ||
#--------------------# | ||
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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) | ||
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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 ***') | ||
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if __name__ == '__main__': | ||
test() |
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May be add a line of reference to the original library, i believe it's
https://github.com/python/cpython/blob/3.12/Lib/imghdr.py?