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134 lines
4.4 KiB
Python
134 lines
4.4 KiB
Python
import imghdr
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import io
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import os
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import unittest
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import warnings
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from test.support import findfile, TESTFN, unlink
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TEST_FILES = (
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('python.png', 'png'),
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('python.gif', 'gif'),
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('python.bmp', 'bmp'),
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('python.ppm', 'ppm'),
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('python.pgm', 'pgm'),
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('python.pbm', 'pbm'),
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('python.jpg', 'jpeg'),
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('python.ras', 'rast'),
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('python.sgi', 'rgb'),
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('python.tiff', 'tiff'),
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('python.xbm', 'xbm'),
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('python.webp', 'webp'),
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('python.exr', 'exr'),
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)
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class UnseekableIO(io.FileIO):
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def tell(self):
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raise io.UnsupportedOperation
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def seek(self, *args, **kwargs):
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raise io.UnsupportedOperation
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class TestImghdr(unittest.TestCase):
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@classmethod
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def setUpClass(cls):
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cls.testfile = findfile('python.png', subdir='imghdrdata')
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with open(cls.testfile, 'rb') as stream:
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cls.testdata = stream.read()
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def tearDown(self):
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unlink(TESTFN)
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def test_data(self):
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for filename, expected in TEST_FILES:
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filename = findfile(filename, subdir='imghdrdata')
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self.assertEqual(imghdr.what(filename), expected)
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with open(filename, 'rb') as stream:
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self.assertEqual(imghdr.what(stream), expected)
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with open(filename, 'rb') as stream:
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data = stream.read()
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self.assertEqual(imghdr.what(None, data), expected)
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self.assertEqual(imghdr.what(None, bytearray(data)), expected)
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def test_register_test(self):
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def test_jumbo(h, file):
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if h.startswith(b'eggs'):
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return 'ham'
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imghdr.tests.append(test_jumbo)
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self.addCleanup(imghdr.tests.pop)
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self.assertEqual(imghdr.what(None, b'eggs'), 'ham')
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def test_file_pos(self):
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with open(TESTFN, 'wb') as stream:
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stream.write(b'ababagalamaga')
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pos = stream.tell()
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stream.write(self.testdata)
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with open(TESTFN, 'rb') as stream:
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stream.seek(pos)
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self.assertEqual(imghdr.what(stream), 'png')
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self.assertEqual(stream.tell(), pos)
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def test_bad_args(self):
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with self.assertRaises(TypeError):
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imghdr.what()
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with self.assertRaises(AttributeError):
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imghdr.what(None)
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with self.assertRaises(TypeError):
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imghdr.what(self.testfile, 1)
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with self.assertRaises(AttributeError):
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imghdr.what(os.fsencode(self.testfile))
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with open(self.testfile, 'rb') as f:
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with self.assertRaises(AttributeError):
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imghdr.what(f.fileno())
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def test_invalid_headers(self):
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for header in (b'\211PN\r\n',
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b'\001\331',
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b'\x59\xA6',
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b'cutecat',
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b'000000JFI',
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b'GIF80'):
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self.assertIsNone(imghdr.what(None, header))
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def test_string_data(self):
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with warnings.catch_warnings():
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warnings.simplefilter("ignore", BytesWarning)
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for filename, _ in TEST_FILES:
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filename = findfile(filename, subdir='imghdrdata')
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with open(filename, 'rb') as stream:
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data = stream.read().decode('latin1')
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with self.assertRaises(TypeError):
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imghdr.what(io.StringIO(data))
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with self.assertRaises(TypeError):
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imghdr.what(None, data)
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def test_missing_file(self):
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with self.assertRaises(FileNotFoundError):
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imghdr.what('missing')
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def test_closed_file(self):
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stream = open(self.testfile, 'rb')
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stream.close()
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with self.assertRaises(ValueError) as cm:
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imghdr.what(stream)
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stream = io.BytesIO(self.testdata)
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stream.close()
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with self.assertRaises(ValueError) as cm:
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imghdr.what(stream)
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def test_unseekable(self):
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with open(TESTFN, 'wb') as stream:
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stream.write(self.testdata)
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with UnseekableIO(TESTFN, 'rb') as stream:
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with self.assertRaises(io.UnsupportedOperation):
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imghdr.what(stream)
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def test_output_stream(self):
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with open(TESTFN, 'wb') as stream:
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stream.write(self.testdata)
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stream.seek(0)
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with self.assertRaises(OSError) as cm:
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imghdr.what(stream)
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if __name__ == '__main__':
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unittest.main()
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