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from ctypes import *
from test.test_ctypes import need_symbol
import unittest
class StringBufferTestCase(unittest.TestCase):
def test_buffer(self):
b = create_string_buffer(32)
self.assertEqual(len(b), 32)
self.assertEqual(sizeof(b), 32 * sizeof(c_char))
self.assertIs(type(b[0]), bytes)
b = create_string_buffer(b"abc")
self.assertEqual(len(b), 4) # trailing nul char
self.assertEqual(sizeof(b), 4 * sizeof(c_char))
self.assertIs(type(b[0]), bytes)
self.assertEqual(b[0], b"a")
self.assertEqual(b[:], b"abc\0")
self.assertEqual(b[::], b"abc\0")
self.assertEqual(b[::-1], b"\0cba")
self.assertEqual(b[::2], b"ac")
self.assertEqual(b[::5], b"a")
self.assertRaises(TypeError, create_string_buffer, "abc")
def test_buffer_interface(self):
self.assertEqual(len(bytearray(create_string_buffer(0))), 0)
self.assertEqual(len(bytearray(create_string_buffer(1))), 1)
@need_symbol('c_wchar')
def test_unicode_buffer(self):
b = create_unicode_buffer(32)
self.assertEqual(len(b), 32)
self.assertEqual(sizeof(b), 32 * sizeof(c_wchar))
self.assertIs(type(b[0]), str)
b = create_unicode_buffer("abc")
self.assertEqual(len(b), 4) # trailing nul char
self.assertEqual(sizeof(b), 4 * sizeof(c_wchar))
self.assertIs(type(b[0]), str)
self.assertEqual(b[0], "a")
self.assertEqual(b[:], "abc\0")
self.assertEqual(b[::], "abc\0")
self.assertEqual(b[::-1], "\0cba")
self.assertEqual(b[::2], "ac")
self.assertEqual(b[::5], "a")
self.assertRaises(TypeError, create_unicode_buffer, b"abc")
@need_symbol('c_wchar')
def test_unicode_conversion(self):
b = create_unicode_buffer("abc")
self.assertEqual(len(b), 4) # trailing nul char
self.assertEqual(sizeof(b), 4 * sizeof(c_wchar))
self.assertIs(type(b[0]), str)
self.assertEqual(b[0], "a")
self.assertEqual(b[:], "abc\0")
self.assertEqual(b[::], "abc\0")
self.assertEqual(b[::-1], "\0cba")
self.assertEqual(b[::2], "ac")
self.assertEqual(b[::5], "a")
@need_symbol('c_wchar')
def test_create_unicode_buffer_non_bmp(self):
expected = 5 if sizeof(c_wchar) == 2 else 3
for s in '\U00010000\U00100000', '\U00010000\U0010ffff':
b = create_unicode_buffer(s)
self.assertEqual(len(b), expected)
self.assertEqual(b[-1], '\0')
if __name__ == "__main__":
unittest.main()