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Directory :  /usr/local/lib/python3.6/ctypes/test/

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Current File : /usr/local/lib/python3.6/ctypes/test/test_buffers.py
from ctypes import *
from ctypes.test 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")

if __name__ == "__main__":
    unittest.main()

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