Issue #2394: implement more of the memoryview API.
This commit is contained in:
Antoine Pitrou
parent
4aeec04624
commit
616d28566b
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@ -621,7 +621,7 @@ class UTF8SigTest(ReadTest):
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def test_bug1601501(self):
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# SF bug #1601501: check that the codec works with a buffer
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str(b"\xef\xbb\xbf", "utf-8-sig")
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self.assertEquals(str(b"\xef\xbb\xbf", "utf-8-sig"), "")
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def test_bom(self):
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d = codecs.getincrementaldecoder("utf-8-sig")()
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@ -5,8 +5,166 @@ XXX We need more tests! Some tests are in test_bytes
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import unittest
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import test.support
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import sys
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class MemoryviewTest(unittest.TestCase):
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class CommonMemoryTests:
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#
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# Tests common to direct memoryviews and sliced memoryviews
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#
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base_object = b"abcdef"
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def check_getitem_with_type(self, tp):
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b = tp(self.base_object)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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self.assertEquals(m[0], b"a")
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self.assert_(isinstance(m[0], bytes), type(m[0]))
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self.assertEquals(m[5], b"f")
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self.assertEquals(m[-1], b"f")
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self.assertEquals(m[-6], b"a")
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# Bounds checking
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self.assertRaises(IndexError, lambda: m[6])
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self.assertRaises(IndexError, lambda: m[-7])
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self.assertRaises(IndexError, lambda: m[sys.maxsize])
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self.assertRaises(IndexError, lambda: m[-sys.maxsize])
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# Type checking
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self.assertRaises(TypeError, lambda: m[None])
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self.assertRaises(TypeError, lambda: m[0.0])
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self.assertRaises(TypeError, lambda: m["a"])
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m = None
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self.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_getitem_readonly(self):
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self.check_getitem_with_type(bytes)
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def test_getitem_writable(self):
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self.check_getitem_with_type(bytearray)
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def test_setitem_readonly(self):
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b = self.base_object
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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def setitem(value):
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m[0] = value
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self.assertRaises(TypeError, setitem, b"a")
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self.assertRaises(TypeError, setitem, 65)
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self.assertRaises(TypeError, setitem, memoryview(b"a"))
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m = None
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self.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_setitem_writable(self):
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b = bytearray(self.base_object)
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oldrefcount = sys.getrefcount(b)
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m = self._view(b)
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m[0] = b"0"
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self._check_contents(b, b"0bcdef")
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m[1:3] = b"12"
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self._check_contents(b, b"012def")
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m[1:1] = b""
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self._check_contents(b, b"012def")
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m[:] = b"abcdef"
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self._check_contents(b, b"abcdef")
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# Overlapping copies of a view into itself
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m[0:3] = m[2:5]
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self._check_contents(b, b"cdedef")
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m[:] = b"abcdef"
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m[2:5] = m[0:3]
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self._check_contents(b, b"ababcf")
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def setitem(key, value):
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m[key] = value
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# Bounds checking
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self.assertRaises(IndexError, setitem, 6, b"a")
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self.assertRaises(IndexError, setitem, -7, b"a")
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self.assertRaises(IndexError, setitem, sys.maxsize, b"a")
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self.assertRaises(IndexError, setitem, -sys.maxsize, b"a")
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# Wrong index/slice types
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self.assertRaises(TypeError, setitem, 0.0, b"a")
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self.assertRaises(TypeError, setitem, (0,), b"a")
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self.assertRaises(TypeError, setitem, "a", b"a")
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# Trying to resize the memory object
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self.assertRaises(ValueError, setitem, 0, b"")
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self.assertRaises(ValueError, setitem, 0, b"ab")
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self.assertRaises(ValueError, setitem, slice(1,1), b"a")
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self.assertRaises(ValueError, setitem, slice(0,2), b"a")
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m = None
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self.assertEquals(sys.getrefcount(b), oldrefcount)
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def test_len(self):
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self.assertEquals(len(self._view(self.base_object)), 6)
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def test_tobytes(self):
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m = self._view(self.base_object)
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b = m.tobytes()
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self.assertEquals(b, b"abcdef")
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self.assert_(isinstance(b, bytes), type(b))
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def test_tolist(self):
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m = self._view(self.base_object)
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l = m.tolist()
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self.assertEquals(l, list(b"abcdef"))
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def test_compare(self):
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# memoryviews can compare for equality with other objects
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# having the buffer interface.
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m = self._view(self.base_object)
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for tp in (bytes, bytearray):
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self.assertTrue(m == tp(b"abcdef"))
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self.assertFalse(m != tp(b"abcdef"))
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self.assertFalse(m == tp(b"abcde"))
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self.assertTrue(m != tp(b"abcde"))
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self.assertFalse(m == tp(b"abcde1"))
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self.assertTrue(m != tp(b"abcde1"))
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self.assertTrue(m == m)
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self.assertTrue(m == m[:])
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self.assertTrue(m[0:6] == m[:])
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self.assertFalse(m[0:5] == m)
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# Comparison with objects which don't support the buffer API
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self.assertFalse(m == "abc")
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self.assertTrue(m != "abc")
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self.assertFalse("abc" == m)
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self.assertTrue("abc" != m)
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# Unordered comparisons
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for c in (m, b"abcdef"):
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self.assertRaises(TypeError, lambda: m < c)
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self.assertRaises(TypeError, lambda: c <= m)
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self.assertRaises(TypeError, lambda: m >= c)
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self.assertRaises(TypeError, lambda: c > m)
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def check_attributes_with_type(self, tp):
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b = tp(self.base_object)
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m = self._view(b)
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self.assertEquals(m.format, 'B')
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self.assertEquals(m.itemsize, 1)
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self.assertEquals(m.ndim, 1)
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self.assertEquals(m.shape, (6,))
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self.assertEquals(m.size, 6)
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self.assertEquals(m.strides, (1,))
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self.assertEquals(m.suboffsets, None)
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return m
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def test_attributes_readonly(self):
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m = self.check_attributes_with_type(bytes)
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self.assertEquals(m.readonly, True)
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def test_attributes_writable(self):
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m = self.check_attributes_with_type(bytearray)
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self.assertEquals(m.readonly, False)
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class MemoryviewTest(unittest.TestCase, CommonMemoryTests):
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def _view(self, obj):
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return memoryview(obj)
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def _check_contents(self, obj, contents):
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self.assertEquals(obj, contents)
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def test_constructor(self):
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ob = b'test'
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@ -17,8 +175,38 @@ class MemoryviewTest(unittest.TestCase):
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self.assertRaises(TypeError, memoryview, argument=ob)
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self.assertRaises(TypeError, memoryview, ob, argument=True)
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class MemorySliceTest(unittest.TestCase, CommonMemoryTests):
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base_object = b"XabcdefY"
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def _view(self, obj):
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m = memoryview(obj)
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return m[1:7]
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def _check_contents(self, obj, contents):
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self.assertEquals(obj[1:7], contents)
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def test_refs(self):
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m = memoryview(b"ab")
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oldrefcount = sys.getrefcount(m)
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m[1:2]
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self.assertEquals(sys.getrefcount(m), oldrefcount)
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class MemorySliceSliceTest(unittest.TestCase, CommonMemoryTests):
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base_object = b"XabcdefY"
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def _view(self, obj):
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m = memoryview(obj)
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return m[:7][1:]
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def _check_contents(self, obj, contents):
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self.assertEquals(obj[1:7], contents)
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def test_main():
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test.support.run_unittest(MemoryviewTest)
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test.support.run_unittest(
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MemoryviewTest, MemorySliceTest, MemorySliceSliceTest)
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if __name__ == "__main__":
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@ -12,6 +12,13 @@ What's new in Python 3.0b3?
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Core and Builtins
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-----------------
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- Issue #2394: implement more of the memoryview API, with the caveat that
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only one-dimensional contiguous buffers are supported and exercised right
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now. Slicing, slice assignment and comparison (equality and inequality)
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have been added. Also, the tolist() method has been implemented, but only
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for byte buffers. Endly, the API has been updated to return bytes objects
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wherever it used to return bytearrays.
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- Issue #3560: clean up the new C PyMemoryView API so that naming is
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internally consistent; add macros PyMemoryView_GET_BASE() and
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PyMemoryView_GET_BUFFER() to access useful properties of a memory views
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@ -13,8 +13,8 @@ memory_getbuf(PyMemoryViewObject *self, Py_buffer *view, int flags)
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}
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if (self->view.obj == NULL)
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return 0;
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return self->view.obj->ob_type->tp_as_buffer->bf_getbuffer(self->base, NULL,
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PyBUF_FULL);
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return self->view.obj->ob_type->tp_as_buffer->bf_getbuffer(
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self->view.obj, NULL, PyBUF_FULL);
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}
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static void
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@ -37,9 +37,14 @@ PyMemoryView_FromBuffer(Py_buffer *info)
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&PyMemoryView_Type);
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if (mview == NULL) return NULL;
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mview->base = NULL;
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/* XXX there should be an API to duplicate a buffer object */
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mview->view = *info;
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if (info->obj)
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Py_INCREF(mview->view.obj);
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if (info->shape == &(info->len))
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mview->view.shape = &(mview->view.len);
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if (info->strides == &(info->itemsize))
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mview->view.strides = &(mview->view.itemsize);
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/* NOTE: mview->view.obj should already have been incref'ed as
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part of PyBuffer_FillInfo(). */
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return (PyObject *)mview;
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}
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@ -258,12 +263,12 @@ PyMemoryView_GetContiguous(PyObject *obj, int buffertype, char fort)
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"for a non-contiguousobject.");
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return NULL;
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}
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bytes = PyByteArray_FromStringAndSize(NULL, view->len);
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bytes = PyBytes_FromStringAndSize(NULL, view->len);
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if (bytes == NULL) {
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PyBuffer_Release(view);
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return NULL;
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}
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dest = PyByteArray_AS_STRING(bytes);
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dest = PyBytes_AS_STRING(bytes);
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/* different copying strategy depending on whether
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or not any pointer de-referencing is needed
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*/
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@ -386,17 +391,45 @@ static PyGetSetDef memory_getsetlist[] ={
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static PyObject *
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memory_tobytes(PyMemoryViewObject *mem, PyObject *noargs)
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{
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return PyByteArray_FromObject((PyObject *)mem);
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return PyObject_CallFunctionObjArgs(
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(PyObject *) &PyBytes_Type, mem, NULL);
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}
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/* TODO: rewrite this function using the struct module to unpack
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each buffer item */
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static PyObject *
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memory_tolist(PyMemoryViewObject *mem, PyObject *noargs)
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{
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/* This should construct a (nested) list of unpacked objects
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possibly using the struct module.
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*/
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Py_INCREF(Py_NotImplemented);
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return Py_NotImplemented;
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Py_buffer *view = &(mem->view);
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Py_ssize_t i;
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PyObject *res, *item;
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char *buf;
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if (strcmp(view->format, "B") || view->itemsize != 1) {
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PyErr_SetString(PyExc_NotImplementedError,
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"tolist() only supports byte views");
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return NULL;
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}
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if (view->ndim != 1) {
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PyErr_SetString(PyExc_NotImplementedError,
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"tolist() only supports one-dimensional objects");
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return NULL;
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}
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res = PyList_New(view->len);
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if (res == NULL)
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return NULL;
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buf = view->buf;
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for (i = 0; i < view->len; i++) {
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item = PyLong_FromUnsignedLong((unsigned char) *buf);
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if (item == NULL) {
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Py_DECREF(res);
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return NULL;
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}
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PyList_SET_ITEM(res, i, item);
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buf++;
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}
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return res;
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}
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@ -412,7 +445,7 @@ static void
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memory_dealloc(PyMemoryViewObject *self)
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{
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if (self->view.obj != NULL) {
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if (PyTuple_Check(self->base)) {
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if (self->base && PyTuple_Check(self->base)) {
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/* Special case when first element is generic object
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with buffer interface and the second element is a
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contiguous "shadow" that must be copied back into
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@ -454,8 +487,8 @@ memory_str(PyMemoryViewObject *self)
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if (PyObject_GetBuffer((PyObject *)self, &view, PyBUF_FULL) < 0)
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return NULL;
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res = PyByteArray_FromStringAndSize(NULL, view.len);
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PyBuffer_ToContiguous(PyByteArray_AS_STRING(res), &view, view.len, 'C');
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res = PyBytes_FromStringAndSize(NULL, view.len);
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PyBuffer_ToContiguous(PyBytes_AS_STRING(res), &view, view.len, 'C');
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PyBuffer_Release(&view);
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return res;
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}
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@ -511,7 +544,7 @@ memory_subscript(PyMemoryViewObject *self, PyObject *key)
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if (result < 0) {
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result += view->shape[0];
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}
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if ((result < 0) || (result > view->shape[0])) {
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if ((result < 0) || (result >= view->shape[0])) {
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PyErr_SetString(PyExc_IndexError,
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"index out of bounds");
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return NULL;
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@ -525,7 +558,7 @@ memory_subscript(PyMemoryViewObject *self, PyObject *key)
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{
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ptr = *((char **)ptr) + view->suboffsets[0];
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}
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return PyByteArray_FromStringAndSize(ptr, view->itemsize);
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return PyBytes_FromStringAndSize(ptr, view->itemsize);
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}
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else {
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/* Return a new memory-view object */
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@ -537,10 +570,46 @@ memory_subscript(PyMemoryViewObject *self, PyObject *key)
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return PyMemoryView_FromBuffer(&newview);
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}
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}
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else if (PySlice_Check(key)) {
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Py_ssize_t start, stop, step, slicelength;
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/* Need to support getting a sliced view */
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Py_INCREF(Py_NotImplemented);
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return Py_NotImplemented;
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if (PySlice_GetIndicesEx((PySliceObject*)key, view->len,
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&start, &stop, &step, &slicelength) < 0) {
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return NULL;
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}
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if (step == 1 && view->ndim == 1) {
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Py_buffer newview;
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void *newbuf = (char *) view->buf
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+ start * view->itemsize;
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int newflags = view->readonly
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? PyBUF_CONTIG_RO : PyBUF_CONTIG;
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/* XXX There should be an API to create a subbuffer */
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if (view->obj != NULL) {
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if (PyObject_GetBuffer(view->obj,
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&newview, newflags) == -1)
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return NULL;
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}
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else {
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newview = *view;
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}
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newview.buf = newbuf;
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newview.len = slicelength;
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newview.format = view->format;
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if (view->shape == &(view->len))
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newview.shape = &(newview.len);
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if (view->strides == &(view->itemsize))
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newview.strides = &(newview.itemsize);
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return PyMemoryView_FromBuffer(&newview);
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}
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PyErr_SetNone(PyExc_NotImplementedError);
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return NULL;
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}
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PyErr_Format(PyExc_TypeError,
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"cannot index memory using \"%.200s\"",
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key->ob_type->tp_name);
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return NULL;
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}
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@ -548,9 +617,138 @@ memory_subscript(PyMemoryViewObject *self, PyObject *key)
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static int
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memory_ass_sub(PyMemoryViewObject *self, PyObject *key, PyObject *value)
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{
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Py_ssize_t start, len, bytelen, i;
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Py_buffer srcview;
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Py_buffer *view = &(self->view);
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char *srcbuf, *destbuf;
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if (view->readonly) {
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PyErr_SetString(PyExc_TypeError,
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"cannot modify read-only memory");
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return -1;
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}
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if (view->ndim != 1) {
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PyErr_SetNone(PyExc_NotImplementedError);
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return -1;
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}
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if (PyIndex_Check(key)) {
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start = PyNumber_AsSsize_t(key, NULL);
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if (start == -1 && PyErr_Occurred())
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return -1;
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if (start < 0) {
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start += view->shape[0];
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}
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if ((start < 0) || (start >= view->shape[0])) {
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PyErr_SetString(PyExc_IndexError,
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"index out of bounds");
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return -1;
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}
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len = 1;
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}
|
||||
else if (PySlice_Check(key)) {
|
||||
Py_ssize_t stop, step;
|
||||
|
||||
if (PySlice_GetIndicesEx((PySliceObject*)key, view->len,
|
||||
&start, &stop, &step, &len) < 0) {
|
||||
return -1;
|
||||
}
|
||||
if (step != 1) {
|
||||
PyErr_SetNone(PyExc_NotImplementedError);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
else {
|
||||
PyErr_Format(PyExc_TypeError,
|
||||
"cannot index memory using \"%.200s\"",
|
||||
key->ob_type->tp_name);
|
||||
return -1;
|
||||
}
|
||||
if (PyObject_GetBuffer(value, &srcview, PyBUF_CONTIG_RO) == -1) {
|
||||
return -1;
|
||||
}
|
||||
/* XXX should we allow assignment of different item sizes
|
||||
as long as the byte length is the same?
|
||||
(e.g. assign 2 shorts to a 4-byte slice) */
|
||||
if (srcview.itemsize != view->itemsize) {
|
||||
PyErr_Format(PyExc_TypeError,
|
||||
"mismatching item sizes for \"%.200s\" and \"%.200s\"",
|
||||
view->obj->ob_type->tp_name, srcview.obj->ob_type->tp_name);
|
||||
goto _error;
|
||||
}
|
||||
if (srcview.len != len) {
|
||||
PyErr_SetString(PyExc_ValueError,
|
||||
"cannot modify size of memoryview object");
|
||||
goto _error;
|
||||
}
|
||||
/* Do the actual copy */
|
||||
destbuf = (char *) view->buf + start * view->itemsize;
|
||||
srcbuf = (char *) srcview.buf;
|
||||
bytelen = len * view->itemsize;
|
||||
if (destbuf + bytelen < srcbuf || srcbuf + bytelen < destbuf)
|
||||
/* No overlapping */
|
||||
memcpy(destbuf, srcbuf, bytelen);
|
||||
else if (destbuf < srcbuf) {
|
||||
/* Copy in ascending order */
|
||||
for (i = 0; i < bytelen; i++)
|
||||
destbuf[i] = srcbuf[i];
|
||||
}
|
||||
else {
|
||||
/* Copy in descencing order */
|
||||
for (i = bytelen - 1; i >= 0; i--)
|
||||
destbuf[i] = srcbuf[i];
|
||||
}
|
||||
|
||||
PyBuffer_Release(&srcview);
|
||||
return 0;
|
||||
|
||||
_error:
|
||||
PyBuffer_Release(&srcview);
|
||||
return -1;
|
||||
}
|
||||
|
||||
static PyObject *
|
||||
memory_richcompare(PyObject *v, PyObject *w, int op)
|
||||
{
|
||||
Py_buffer vv, ww;
|
||||
int equal = 0;
|
||||
PyObject *res;
|
||||
|
||||
vv.obj = NULL;
|
||||
ww.obj = NULL;
|
||||
if (op != Py_EQ && op != Py_NE)
|
||||
goto _notimpl;
|
||||
if (PyObject_GetBuffer(v, &vv, PyBUF_CONTIG_RO) == -1) {
|
||||
PyErr_Clear();
|
||||
goto _notimpl;
|
||||
}
|
||||
if (PyObject_GetBuffer(w, &ww, PyBUF_CONTIG_RO) == -1) {
|
||||
PyErr_Clear();
|
||||
goto _notimpl;
|
||||
}
|
||||
|
||||
if (vv.itemsize != ww.itemsize || vv.len != ww.len)
|
||||
goto _end;
|
||||
|
||||
equal = !memcmp(vv.buf, ww.buf, vv.len * vv.itemsize);
|
||||
|
||||
_end:
|
||||
PyBuffer_Release(&vv);
|
||||
PyBuffer_Release(&ww);
|
||||
if ((equal && op == Py_EQ) || (!equal && op == Py_NE))
|
||||
res = Py_True;
|
||||
else
|
||||
res = Py_False;
|
||||
Py_INCREF(res);
|
||||
return res;
|
||||
|
||||
_notimpl:
|
||||
PyBuffer_Release(&vv);
|
||||
PyBuffer_Release(&ww);
|
||||
Py_INCREF(Py_NotImplemented);
|
||||
return Py_NotImplemented;
|
||||
}
|
||||
|
||||
|
||||
/* As mapping */
|
||||
static PyMappingMethods memory_as_mapping = {
|
||||
(lenfunc)memory_length, /*mp_length*/
|
||||
|
|
@ -591,7 +789,7 @@ PyTypeObject PyMemoryView_Type = {
|
|||
memory_doc, /* tp_doc */
|
||||
0, /* tp_traverse */
|
||||
0, /* tp_clear */
|
||||
0, /* tp_richcompare */
|
||||
memory_richcompare, /* tp_richcompare */
|
||||
0, /* tp_weaklistoffset */
|
||||
0, /* tp_iter */
|
||||
0, /* tp_iternext */
|
||||
|
|
|
|||
Loading…
Reference in New Issue