mirror of
https://github.com/RustPython/RustPython.git
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Jeong, YunWon
c603eb7c9a
* Implement PEP 688 __buffer__ and __release_buffer__ A Python class could not export a buffer: the slot machinery had no bf_getbuffer or bf_releasebuffer, and every consumer acquired buffers as PyBUF_FULL_RO through a module of PyBUF_* constants. Add both slots. PyBuffer::release now runs a Python __release_buffer__ before the exporter's own release, once per acquisition, which PyBuffer tracks with an `acquired` flag that clones do not inherit. An export made by a Python __buffer__ is held by a _buffer_wrapper payload that counts its exports and drops the returned memoryview with the last one, and the view handed to __release_buffer__ is a _buffer_window that owns no export, so releasing it inside the hook is inert instead of re-entering it. Replace the PyBUF_* constants with a BufferFlags bitflags type whose composite requests are supersets of the simpler ones, so `contains` answers the REQ_* questions, and pass the request to PyBuffer::from_object. Each consumer now asks for what its counterpart asks for: y* arguments for SIMPLE, w* for WRITABLE, BytesIO.write for CONTIG_RO, bytes(), bytearray() and memoryview() for FULL_RO. memoryview checks the request in memory_getbuf, and array.array and mmap.mmap expose __release_buffer__. Test buffer support with PyObject::check_buffer (PyObject_CheckBuffer) instead of attempting an acquisition, so an exception raised by __buffer__ is no longer reported as the object not being bytes-like, and a __buffer__ with side effects runs once. PyBytesInner becomes a y* conversion as a result: bytes and bytearray methods no longer accept iterables of ints, and find, index, count and __contains__ take the arguments parse_args_finds_byte and bytes_contains describe. A view exports its start offset in the descriptor rather than in its window, which fixes a panic when collecting from a negative-stride view. BytesIO.write rechecks closed after acquiring its buffer, which __buffer__ can close in between. Assisted-by: Claude Code:claude-opus-5 * Rework the buffer protocol around managed exports and view offsets Give `PyBuffer` the `_PyManagedBufferObject` shape: one `bf_getbuffer` acquisition is shared by every handle taken from it, cloning takes another share instead of re-acquiring, and the exporter's release runs once when the last share goes away. Remove `retain`, the unsafe `drop_without_release`, the three `impl Drop`s and the `ManuallyDrop` that stood in for this. Add `abort_acquisition` so a failed request does not run `bf_releasebuffer`. Move the view start into `BufferDescriptor::offset`, the `Py_buffer.buf` analogue, and drop the separate `start` fields on `PyMemoryView` and `PyBufferWrapper`. Slicing goes through `SaturatedSlice::adjust_indices_start`, which reproduces `PySlice_AdjustIndices` and keeps the adjusted start. Fix `zip_eq` to take its contiguous fast path only when both last dimensions are contiguous, and make `for_each_segment` and `zip_eq` handle zero-length and zero-dimensional views. Add `BufferDescriptor::projected` so a request without `PyBUF_ND`, `PyBUF_STRIDES` or `PyBUF_FORMAT` receives a correspondingly reduced descriptor, and reject a request without `PyBUF_INDIRECT` against an exporter that has suboffsets. Copy the source first in `memoryview` slice assignment when both sides reach the same root exporter. Hold the export across the resize in `bytearray.extend`, take `y*` in `marshal.loads`, stop probing the buffer protocol in `FsPath`, rewrite `ord` over the concrete string types, fold `array`'s buffer slot into one `slot_as_buffer`, take `w*`/`y*` in `_overlapped`, and thread the new `offset` field through the `_ctypes` descriptors. Assisted-by: Claude * Re-check a memoryview after a conversion and tighten cast and release `pack_single` and `unpack_single` addressed the buffer with a position taken before `__index__` ran, so releasing the view from that conversion read or wrote outside the exporter's storage, panicking when it had also shrunk. Check the released flag again once the conversion is done, as `CHECK_RELEASED_AGAIN` does. Reject a cast to a format that is not a single native format character with an optional `@` in front of it. An empty format reached a division by its item size of zero. get_native_fmtchar Report a second `__release_buffer__` on the same view as a `ValueError` rather than accepting it, and check that the view belongs to the object first; the silent case is a view that exports nothing. wrap_releasebuffer Compare against another memoryview by reading its view where it lies instead of acquiring a buffer from it, so the restricted view handed to `__release_buffer__` compares equal rather than unequal in one direction only. memory_richcompare Name the type in the unraisable an exception from `__release_buffer__` reports, as `releasebuffer_call_python` does, instead of reporting the exporter object. Assisted-by: Claude * Re-check the destination of a memoryview slice assignment Acquiring the source runs `__buffer__`, which can release the destination view, so check the released flag again once the source is in hand and before the structures are compared, as `copy_single` does. Build the sliced destination as a view that counts as no export, the way a `Py_buffer dest = *view` copy does. Holding one kept the exporter unresizable for the length of the assignment, so a source that released the view and then resized the exporter met a `BufferError` instead of the assignment reporting the released view. Assisted-by: Claude * Answer the memoryview contiguity getsets with the layout `f_contiguous` reported the row-major answer for one dimension and False for any more, so a view laid out both ways, such as one of shape (1, 8), reported False while `check_buffer_request` accepted a `F_CONTIGUOUS` request on it. `contiguous` answered row-major order alone. Move the Fortran-order test from `PyMemoryView` to `BufferDescriptor`, next to the row-major one it differs from only in iteration order, and answer all three getsets with it. Assisted-by: Claude
1091 lines
45 KiB
Python
Vendored
1091 lines
45 KiB
Python
Vendored
from collections import abc
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from itertools import combinations
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import array
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import gc
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import math
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import operator
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import unittest
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import struct
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import sys
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import weakref
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from test import support
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from test.support import import_helper
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from test.support.script_helper import assert_python_ok
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from test.support.testcase import ComplexesAreIdenticalMixin
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ISBIGENDIAN = sys.byteorder == "big"
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integer_codes = 'b', 'B', 'h', 'H', 'i', 'I', 'l', 'L', 'q', 'Q', 'n', 'N'
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byteorders = '', '@', '=', '<', '>', '!'
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INF = float('inf')
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NAN = float('nan')
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def iter_integer_formats(byteorders=byteorders):
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for code in integer_codes:
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for byteorder in byteorders:
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if (byteorder not in ('', '@') and code in ('n', 'N')):
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continue
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yield code, byteorder
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def string_reverse(s):
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return s[::-1]
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def bigendian_to_native(value):
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if ISBIGENDIAN:
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return value
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else:
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return string_reverse(value)
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class StructTest(ComplexesAreIdenticalMixin, unittest.TestCase):
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def test_isbigendian(self):
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self.assertEqual((struct.pack('=i', 1)[0] == 0), ISBIGENDIAN)
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def test_consistence(self):
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self.assertRaises(struct.error, struct.calcsize, 'Z')
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sz = struct.calcsize('i')
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self.assertEqual(sz * 3, struct.calcsize('iii'))
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fmt = 'cbxxxxxxhhhhiillffd?'
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fmt3 = '3c3b18x12h6i6l6f3d3?'
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sz = struct.calcsize(fmt)
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sz3 = struct.calcsize(fmt3)
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self.assertEqual(sz * 3, sz3)
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self.assertRaises(struct.error, struct.pack, 'iii', 3)
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self.assertRaises(struct.error, struct.pack, 'i', 3, 3, 3)
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self.assertRaises((TypeError, struct.error), struct.pack, 'i', 'foo')
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self.assertRaises((TypeError, struct.error), struct.pack, 'P', 'foo')
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self.assertRaises(struct.error, struct.unpack, 'd', b'flap')
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s = struct.pack('ii', 1, 2)
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self.assertRaises(struct.error, struct.unpack, 'iii', s)
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self.assertRaises(struct.error, struct.unpack, 'i', s)
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def test_transitiveness(self):
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c = b'a'
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b = 1
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h = 255
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i = 65535
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l = 65536
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f = 3.1415
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d = 3.1415
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t = True
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for prefix in ('', '@', '<', '>', '=', '!'):
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for format in ('xcbhilfd?', 'xcBHILfd?'):
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format = prefix + format
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s = struct.pack(format, c, b, h, i, l, f, d, t)
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cp, bp, hp, ip, lp, fp, dp, tp = struct.unpack(format, s)
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self.assertEqual(cp, c)
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self.assertEqual(bp, b)
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self.assertEqual(hp, h)
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self.assertEqual(ip, i)
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self.assertEqual(lp, l)
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self.assertEqual(int(100 * fp), int(100 * f))
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self.assertEqual(int(100 * dp), int(100 * d))
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self.assertEqual(tp, t)
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def test_new_features(self):
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# Test some of the new features in detail
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# (format, argument, big-endian result, little-endian result, asymmetric)
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tests = [
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('c', b'a', b'a', b'a', 0),
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('xc', b'a', b'\0a', b'\0a', 0),
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('cx', b'a', b'a\0', b'a\0', 0),
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('s', b'a', b'a', b'a', 0),
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('0s', b'helloworld', b'', b'', 1),
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('1s', b'helloworld', b'h', b'h', 1),
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('9s', b'helloworld', b'helloworl', b'helloworl', 1),
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('10s', b'helloworld', b'helloworld', b'helloworld', 0),
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('11s', b'helloworld', b'helloworld\0', b'helloworld\0', 1),
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('20s', b'helloworld', b'helloworld'+10*b'\0', b'helloworld'+10*b'\0', 1),
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('0p', b'helloworld', b'', b'', 1),
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('1p', b'helloworld', b'\x00', b'\x00', 1),
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('2p', b'helloworld', b'\x01h', b'\x01h', 1),
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('10p', b'helloworld', b'\x09helloworl', b'\x09helloworl', 1),
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('11p', b'helloworld', b'\x0Ahelloworld', b'\x0Ahelloworld', 0),
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('12p', b'helloworld', b'\x0Ahelloworld\0', b'\x0Ahelloworld\0', 1),
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('20p', b'helloworld', b'\x0Ahelloworld'+9*b'\0', b'\x0Ahelloworld'+9*b'\0', 1),
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('b', 7, b'\7', b'\7', 0),
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('b', -7, b'\371', b'\371', 0),
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('B', 7, b'\7', b'\7', 0),
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('B', 249, b'\371', b'\371', 0),
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('h', 700, b'\002\274', b'\274\002', 0),
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('h', -700, b'\375D', b'D\375', 0),
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('H', 700, b'\002\274', b'\274\002', 0),
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('H', 0x10000-700, b'\375D', b'D\375', 0),
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('i', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('i', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('I', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('I', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('l', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('l', -70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('L', 70000000, b'\004,\035\200', b'\200\035,\004', 0),
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('L', 0x100000000-70000000, b'\373\323\342\200', b'\200\342\323\373', 0),
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('f', 2.0, b'@\000\000\000', b'\000\000\000@', 0),
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('d', 2.0, b'@\000\000\000\000\000\000\000',
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b'\000\000\000\000\000\000\000@', 0),
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('f', -2.0, b'\300\000\000\000', b'\000\000\000\300', 0),
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('d', -2.0, b'\300\000\000\000\000\000\000\000',
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b'\000\000\000\000\000\000\000\300', 0),
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('?', 0, b'\0', b'\0', 0),
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('?', 3, b'\1', b'\1', 1),
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('?', True, b'\1', b'\1', 0),
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('?', [], b'\0', b'\0', 1),
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('?', (1,), b'\1', b'\1', 1),
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]
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for fmt, arg, big, lil, asy in tests:
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for (xfmt, exp) in [('>'+fmt, big), ('!'+fmt, big), ('<'+fmt, lil),
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('='+fmt, ISBIGENDIAN and big or lil)]:
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res = struct.pack(xfmt, arg)
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self.assertEqual(res, exp)
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self.assertEqual(struct.calcsize(xfmt), len(res))
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rev = struct.unpack(xfmt, res)[0]
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if rev != arg:
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self.assertTrue(asy)
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def test_calcsize(self):
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expected_size = {
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'b': 1, 'B': 1,
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'h': 2, 'H': 2,
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'i': 4, 'I': 4,
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'l': 4, 'L': 4,
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'q': 8, 'Q': 8,
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}
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# standard integer sizes
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for code, byteorder in iter_integer_formats(('=', '<', '>', '!')):
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format = byteorder+code
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size = struct.calcsize(format)
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self.assertEqual(size, expected_size[code])
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# native integer sizes
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native_pairs = 'bB', 'hH', 'iI', 'lL', 'nN', 'qQ'
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for format_pair in native_pairs:
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for byteorder in '', '@':
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signed_size = struct.calcsize(byteorder + format_pair[0])
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unsigned_size = struct.calcsize(byteorder + format_pair[1])
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self.assertEqual(signed_size, unsigned_size)
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# bounds for native integer sizes
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self.assertEqual(struct.calcsize('b'), 1)
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self.assertLessEqual(2, struct.calcsize('h'))
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self.assertLessEqual(4, struct.calcsize('l'))
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self.assertLessEqual(struct.calcsize('h'), struct.calcsize('i'))
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self.assertLessEqual(struct.calcsize('i'), struct.calcsize('l'))
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self.assertLessEqual(8, struct.calcsize('q'))
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self.assertLessEqual(struct.calcsize('l'), struct.calcsize('q'))
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self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('i'))
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self.assertGreaterEqual(struct.calcsize('n'), struct.calcsize('P'))
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def test_integers(self):
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# Integer tests (bBhHiIlLqQnN).
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import binascii
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class IntTester(unittest.TestCase):
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def __init__(self, format):
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super(IntTester, self).__init__(methodName='test_one')
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self.format = format
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self.code = format[-1]
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self.byteorder = format[:-1]
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if not self.byteorder in byteorders:
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raise ValueError("unrecognized packing byteorder: %s" %
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self.byteorder)
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self.bytesize = struct.calcsize(format)
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self.bitsize = self.bytesize * 8
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if self.code in tuple('bhilqn'):
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self.signed = True
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self.min_value = -(2**(self.bitsize-1))
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self.max_value = 2**(self.bitsize-1) - 1
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elif self.code in tuple('BHILQN'):
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self.signed = False
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self.min_value = 0
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self.max_value = 2**self.bitsize - 1
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else:
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raise ValueError("unrecognized format code: %s" %
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self.code)
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def test_one(self, x, pack=struct.pack,
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unpack=struct.unpack,
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unhexlify=binascii.unhexlify):
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format = self.format
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if self.min_value <= x <= self.max_value:
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expected = x
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if self.signed and x < 0:
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expected += 1 << self.bitsize
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self.assertGreaterEqual(expected, 0)
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expected = '%x' % expected
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if len(expected) & 1:
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expected = "0" + expected
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expected = expected.encode('ascii')
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expected = unhexlify(expected)
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expected = (b"\x00" * (self.bytesize - len(expected)) +
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expected)
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if (self.byteorder == '<' or
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self.byteorder in ('', '@', '=') and not ISBIGENDIAN):
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expected = string_reverse(expected)
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self.assertEqual(len(expected), self.bytesize)
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# Pack work?
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got = pack(format, x)
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self.assertEqual(got, expected)
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# Unpack work?
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retrieved = unpack(format, got)[0]
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self.assertEqual(x, retrieved)
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# Adding any byte should cause a "too big" error.
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self.assertRaises((struct.error, TypeError), unpack, format,
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b'\x01' + got)
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else:
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# x is out of range -- verify pack realizes that.
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self.assertRaises((OverflowError, ValueError, struct.error),
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pack, format, x)
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def run(self):
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from random import randrange
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# Create all interesting powers of 2.
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values = []
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for exp in range(self.bitsize + 3):
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values.append(1 << exp)
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# Add some random values.
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for i in range(self.bitsize):
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val = 0
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for j in range(self.bytesize):
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val = (val << 8) | randrange(256)
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values.append(val)
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# Values absorbed from other tests
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values.extend([300, 700000, sys.maxsize*4])
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# Try all those, and their negations, and +-1 from
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# them. Note that this tests all power-of-2
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# boundaries in range, and a few out of range, plus
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# +-(2**n +- 1).
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for base in values:
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for val in -base, base:
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for incr in -1, 0, 1:
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x = val + incr
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self.test_one(x)
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# Some error cases.
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class NotAnInt:
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def __int__(self):
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return 42
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# Objects with an '__index__' method should be allowed
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# to pack as integers. That is assuming the implemented
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# '__index__' method returns an 'int'.
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class Indexable(object):
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def __init__(self, value):
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self._value = value
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def __index__(self):
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return self._value
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# If the '__index__' method raises a type error, then
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# '__int__' should be used with a deprecation warning.
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class BadIndex(object):
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def __index__(self):
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raise TypeError
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def __int__(self):
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return 42
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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"a string")
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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randrange)
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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3+42j)
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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NotAnInt())
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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BadIndex())
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# Check for legitimate values from '__index__'.
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for obj in (Indexable(0), Indexable(10), Indexable(17),
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Indexable(42), Indexable(100), Indexable(127)):
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try:
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struct.pack(format, obj)
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except:
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self.fail("integer code pack failed on object "
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"with '__index__' method")
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# Check for bogus values from '__index__'.
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for obj in (Indexable(b'a'), Indexable('b'), Indexable(None),
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Indexable({'a': 1}), Indexable([1, 2, 3])):
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self.assertRaises((TypeError, struct.error),
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struct.pack, self.format,
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obj)
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for code, byteorder in iter_integer_formats():
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format = byteorder+code
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t = IntTester(format)
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t.run()
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def test_nN_code(self):
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# n and N don't exist in standard sizes
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def assertStructError(func, *args, **kwargs):
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with self.assertRaises(struct.error) as cm:
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func(*args, **kwargs)
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self.assertIn("bad char in struct format", str(cm.exception))
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for code in 'nN':
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for byteorder in ('=', '<', '>', '!'):
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format = byteorder+code
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assertStructError(struct.calcsize, format)
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assertStructError(struct.pack, format, 0)
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assertStructError(struct.unpack, format, b"")
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def test_p_code(self):
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# Test p ("Pascal string") code.
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for code, input, expected, expectedback in [
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('0p', b'abc', b'', b''),
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('p', b'abc', b'\x00', b''),
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('1p', b'abc', b'\x00', b''),
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('2p', b'abc', b'\x01a', b'a'),
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('3p', b'abc', b'\x02ab', b'ab'),
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('4p', b'abc', b'\x03abc', b'abc'),
|
|
('5p', b'abc', b'\x03abc\x00', b'abc'),
|
|
('6p', b'abc', b'\x03abc\x00\x00', b'abc'),
|
|
('1000p', b'x'*1000, b'\xff' + b'x'*999, b'x'*255)]:
|
|
got = struct.pack(code, input)
|
|
self.assertEqual(got, expected)
|
|
(got,) = struct.unpack(code, got)
|
|
self.assertEqual(got, expectedback)
|
|
|
|
def test_705836(self):
|
|
# SF bug 705836. "<f" and ">f" had a severe rounding bug, where a carry
|
|
# from the low-order discarded bits could propagate into the exponent
|
|
# field, causing the result to be wrong by a factor of 2.
|
|
for base in range(1, 33):
|
|
# smaller <- largest representable float less than base.
|
|
delta = 0.5
|
|
while base - delta / 2.0 != base:
|
|
delta /= 2.0
|
|
smaller = base - delta
|
|
# Packing this rounds away a solid string of trailing 1 bits.
|
|
packed = struct.pack("<f", smaller)
|
|
unpacked = struct.unpack("<f", packed)[0]
|
|
# This failed at base = 2, 4, and 32, with unpacked = 1, 2, and
|
|
# 16, respectively.
|
|
self.assertEqual(base, unpacked)
|
|
bigpacked = struct.pack(">f", smaller)
|
|
self.assertEqual(bigpacked, string_reverse(packed))
|
|
unpacked = struct.unpack(">f", bigpacked)[0]
|
|
self.assertEqual(base, unpacked)
|
|
|
|
# Largest finite IEEE single.
|
|
big = (1 << 24) - 1
|
|
big = math.ldexp(big, 127 - 23)
|
|
packed = struct.pack(">f", big)
|
|
unpacked = struct.unpack(">f", packed)[0]
|
|
self.assertEqual(big, unpacked)
|
|
|
|
# The same, but tack on a 1 bit so it rounds up to infinity.
|
|
big = (1 << 25) - 1
|
|
big = math.ldexp(big, 127 - 24)
|
|
self.assertRaises(OverflowError, struct.pack, ">f", big)
|
|
self.assertRaises(OverflowError, struct.pack, "<f", big)
|
|
# same for native format, see gh-145633
|
|
self.assertRaises(OverflowError, struct.pack, "f", big)
|
|
|
|
# And for half-floats
|
|
big = (1 << 11) - 1
|
|
big = math.ldexp(big, 15 - 10)
|
|
packed = struct.pack(">e", big)
|
|
unpacked = struct.unpack(">e", packed)[0]
|
|
self.assertEqual(big, unpacked)
|
|
big = (1 << 12) - 1
|
|
big = math.ldexp(big, 15 - 11)
|
|
self.assertRaises(OverflowError, struct.pack, ">e", big)
|
|
self.assertRaises(OverflowError, struct.pack, "<e", big)
|
|
self.assertRaises(OverflowError, struct.pack, "e", big)
|
|
|
|
def test_1530559(self):
|
|
for code, byteorder in iter_integer_formats():
|
|
format = byteorder + code
|
|
self.assertRaises(struct.error, struct.pack, format, 1.0)
|
|
self.assertRaises(struct.error, struct.pack, format, 1.5)
|
|
self.assertRaises(struct.error, struct.pack, 'P', 1.0)
|
|
self.assertRaises(struct.error, struct.pack, 'P', 1.5)
|
|
|
|
def test_unpack_from(self):
|
|
test_string = b'abcd01234'
|
|
fmt = '4s'
|
|
s = struct.Struct(fmt)
|
|
for cls in (bytes, bytearray):
|
|
data = cls(test_string)
|
|
self.assertEqual(s.unpack_from(data), (b'abcd',))
|
|
self.assertEqual(s.unpack_from(data, 2), (b'cd01',))
|
|
self.assertEqual(s.unpack_from(data, 4), (b'0123',))
|
|
for i in range(6):
|
|
self.assertEqual(s.unpack_from(data, i), (data[i:i+4],))
|
|
for i in range(6, len(test_string) + 1):
|
|
self.assertRaises(struct.error, s.unpack_from, data, i)
|
|
for cls in (bytes, bytearray):
|
|
data = cls(test_string)
|
|
self.assertEqual(struct.unpack_from(fmt, data), (b'abcd',))
|
|
self.assertEqual(struct.unpack_from(fmt, data, 2), (b'cd01',))
|
|
self.assertEqual(struct.unpack_from(fmt, data, 4), (b'0123',))
|
|
for i in range(6):
|
|
self.assertEqual(struct.unpack_from(fmt, data, i), (data[i:i+4],))
|
|
for i in range(6, len(test_string) + 1):
|
|
self.assertRaises(struct.error, struct.unpack_from, fmt, data, i)
|
|
|
|
# keyword arguments
|
|
self.assertEqual(s.unpack_from(buffer=test_string, offset=2),
|
|
(b'cd01',))
|
|
|
|
def _test_pack_into(self, pack_into):
|
|
test_string = b'Reykjavik rocks, eow!'
|
|
writable_buf = memoryview(array.array('b', b' '*100))
|
|
|
|
# Test without offset
|
|
pack_into(writable_buf, 0, test_string)
|
|
from_buf = writable_buf.tobytes()[:len(test_string)]
|
|
self.assertEqual(from_buf, test_string)
|
|
|
|
# Test with offset.
|
|
pack_into(writable_buf, 10, test_string)
|
|
from_buf = writable_buf.tobytes()[:len(test_string)+10]
|
|
self.assertEqual(from_buf, test_string[:10] + test_string)
|
|
|
|
# Test with negative offset.
|
|
pack_into(writable_buf, -30, test_string)
|
|
from_buf = writable_buf.tobytes()[-30:-30+len(test_string)]
|
|
self.assertEqual(from_buf, test_string)
|
|
|
|
# Go beyond boundaries.
|
|
small_buf = array.array('b', b' '*10)
|
|
with self.assertRaises((ValueError, struct.error)):
|
|
pack_into(small_buf, 0, test_string)
|
|
with self.assertRaises((ValueError, struct.error)):
|
|
pack_into(writable_buf, 90, test_string)
|
|
with self.assertRaises((ValueError, struct.error)):
|
|
pack_into(writable_buf, -10, test_string)
|
|
with self.assertRaises((ValueError, struct.error)):
|
|
pack_into(writable_buf, 150, test_string)
|
|
with self.assertRaises((ValueError, struct.error)):
|
|
pack_into(writable_buf, -150, test_string)
|
|
|
|
# Test invalid buffer.
|
|
self.assertRaises(TypeError, pack_into, b' '*100, 0, test_string)
|
|
self.assertRaises(TypeError, pack_into, ' '*100, 0, test_string)
|
|
self.assertRaises(TypeError, pack_into, [0]*100, 0, test_string)
|
|
self.assertRaises(TypeError, pack_into, None, 0, test_string)
|
|
self.assertRaises(TypeError, pack_into, writable_buf[::2], 0, test_string)
|
|
self.assertRaises(TypeError, pack_into, writable_buf[::-1], 0, test_string)
|
|
|
|
# Test bogus offset (issue bpo-3694)
|
|
with self.assertRaises(TypeError):
|
|
pack_into(writable_buf, None, test_string)
|
|
with self.assertRaises(TypeError):
|
|
pack_into(writable_buf, 0.0, test_string)
|
|
with self.assertRaises((IndexError, OverflowError)):
|
|
pack_into(writable_buf, 2**1000, test_string)
|
|
with self.assertRaises((IndexError, OverflowError)):
|
|
pack_into(writable_buf, -2**1000, test_string)
|
|
|
|
def test_pack_into(self):
|
|
s = struct.Struct('21s')
|
|
self._test_pack_into(s.pack_into)
|
|
|
|
def test_pack_into_fn(self):
|
|
pack_into = lambda *args: struct.pack_into('21s', *args)
|
|
self._test_pack_into(pack_into)
|
|
|
|
def test_unpack_with_buffer(self):
|
|
# SF bug 1563759: struct.unpack doesn't support buffer protocol objects
|
|
data1 = array.array('B', b'\x12\x34\x56\x78')
|
|
data2 = memoryview(b'\x12\x34\x56\x78') # XXX b'......XXXX......', 6, 4
|
|
for data in [data1, data2]:
|
|
value, = struct.unpack('>I', data)
|
|
self.assertEqual(value, 0x12345678)
|
|
|
|
def test_bool(self):
|
|
class ExplodingBool(object):
|
|
def __bool__(self):
|
|
raise OSError
|
|
for prefix in tuple("<>!=")+('',):
|
|
false = (), [], [], '', 0
|
|
true = [1], 'test', 5, -1, 0xffffffff+1, 0xffffffff/2
|
|
|
|
falseFormat = prefix + '?' * len(false)
|
|
packedFalse = struct.pack(falseFormat, *false)
|
|
unpackedFalse = struct.unpack(falseFormat, packedFalse)
|
|
|
|
trueFormat = prefix + '?' * len(true)
|
|
packedTrue = struct.pack(trueFormat, *true)
|
|
unpackedTrue = struct.unpack(trueFormat, packedTrue)
|
|
|
|
self.assertEqual(len(true), len(unpackedTrue))
|
|
self.assertEqual(len(false), len(unpackedFalse))
|
|
|
|
for t in unpackedFalse:
|
|
self.assertFalse(t)
|
|
for t in unpackedTrue:
|
|
self.assertTrue(t)
|
|
|
|
packed = struct.pack(prefix+'?', 1)
|
|
|
|
self.assertEqual(len(packed), struct.calcsize(prefix+'?'))
|
|
|
|
if len(packed) != 1:
|
|
self.assertFalse(prefix, msg='encoded bool is not one byte: %r'
|
|
%packed)
|
|
|
|
try:
|
|
struct.pack(prefix + '?', ExplodingBool())
|
|
except OSError:
|
|
pass
|
|
else:
|
|
self.fail("Expected OSError: struct.pack(%r, "
|
|
"ExplodingBool())" % (prefix + '?'))
|
|
|
|
for c in [b'\x01', b'\x7f', b'\xff', b'\x0f', b'\xf0']:
|
|
self.assertTrue(struct.unpack('>?', c)[0])
|
|
self.assertTrue(struct.unpack('<?', c)[0])
|
|
self.assertTrue(struct.unpack('=?', c)[0])
|
|
self.assertTrue(struct.unpack('@?', c)[0])
|
|
|
|
def test_count_overflow(self):
|
|
hugecount = '{}b'.format(sys.maxsize+1)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount)
|
|
|
|
hugecount2 = '{}b{}H'.format(sys.maxsize//2, sys.maxsize//2)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount2)
|
|
|
|
hugecount3 = '{}i{}q'.format(sys.maxsize // 4, sys.maxsize // 8)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount3)
|
|
|
|
hugecount4 = '{}?s'.format(sys.maxsize)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount4)
|
|
|
|
hugecount5 = '{}?p'.format(sys.maxsize)
|
|
self.assertRaises(struct.error, struct.calcsize, hugecount5)
|
|
|
|
def test_trailing_counter(self):
|
|
store = array.array('b', b' '*100)
|
|
|
|
# format lists containing only count spec should result in an error
|
|
self.assertRaises(struct.error, struct.pack, '12345')
|
|
self.assertRaises(struct.error, struct.unpack, '12345', b'')
|
|
self.assertRaises(struct.error, struct.pack_into, '12345', store, 0)
|
|
self.assertRaises(struct.error, struct.unpack_from, '12345', store, 0)
|
|
|
|
# Format lists with trailing count spec should result in an error
|
|
self.assertRaises(struct.error, struct.pack, 'c12345', 'x')
|
|
self.assertRaises(struct.error, struct.unpack, 'c12345', b'x')
|
|
self.assertRaises(struct.error, struct.pack_into, 'c12345', store, 0,
|
|
'x')
|
|
self.assertRaises(struct.error, struct.unpack_from, 'c12345', store,
|
|
0)
|
|
|
|
# Mixed format tests
|
|
self.assertRaises(struct.error, struct.pack, '14s42', 'spam and eggs')
|
|
self.assertRaises(struct.error, struct.unpack, '14s42',
|
|
b'spam and eggs')
|
|
self.assertRaises(struct.error, struct.pack_into, '14s42', store, 0,
|
|
'spam and eggs')
|
|
self.assertRaises(struct.error, struct.unpack_from, '14s42', store, 0)
|
|
|
|
@unittest.expectedFailure # TODO: RUSTPYTHON; AssertionError: '>h' != '>hh'
|
|
def test_Struct_reinitialization(self):
|
|
# Issue 9422: there was a memory leak when reinitializing a
|
|
# Struct instance. This test can be used to detect the leak
|
|
# when running with regrtest -L.
|
|
s = struct.Struct('>h')
|
|
s.__init__('>hh')
|
|
self.assertEqual(s.format, '>hh')
|
|
packed = b'\x00\x01\x00\x02'
|
|
self.assertEqual(s.pack(1, 2), packed)
|
|
self.assertEqual(s.unpack(packed), (1, 2))
|
|
|
|
with self.assertRaises(UnicodeEncodeError):
|
|
s.__init__('\udc00')
|
|
self.assertEqual(s.format, '>hh')
|
|
self.assertEqual(s.pack(1, 2), packed)
|
|
self.assertEqual(s.unpack(packed), (1, 2))
|
|
|
|
with self.assertRaises(struct.error):
|
|
s.__init__('$')
|
|
self.assertEqual(s.format, '>hh')
|
|
self.assertEqual(s.pack(1, 2), packed)
|
|
self.assertEqual(s.unpack(packed), (1, 2))
|
|
|
|
def check_sizeof(self, format_str, number_of_codes):
|
|
# The size of 'PyStructObject'
|
|
totalsize = support.calcobjsize('2n3P')
|
|
# The size taken up by the 'formatcode' dynamic array
|
|
totalsize += struct.calcsize('P3n0P') * (number_of_codes + 1)
|
|
support.check_sizeof(self, struct.Struct(format_str), totalsize)
|
|
|
|
@support.cpython_only
|
|
def test__sizeof__(self):
|
|
for code in integer_codes:
|
|
self.check_sizeof(code, 1)
|
|
self.check_sizeof('BHILfdspP', 9)
|
|
self.check_sizeof('B' * 1234, 1234)
|
|
self.check_sizeof('fd', 2)
|
|
self.check_sizeof('xxxxxxxxxxxxxx', 0)
|
|
self.check_sizeof('100H', 1)
|
|
self.check_sizeof('187s', 1)
|
|
self.check_sizeof('20p', 1)
|
|
self.check_sizeof('0s', 1)
|
|
self.check_sizeof('0p', 1)
|
|
self.check_sizeof('0c', 0)
|
|
|
|
def test_boundary_error_message(self):
|
|
regex1 = (
|
|
r'pack_into requires a buffer of at least 6 '
|
|
r'bytes for packing 1 bytes at offset 5 '
|
|
r'\(actual buffer size is 1\)'
|
|
)
|
|
with self.assertRaisesRegex(struct.error, regex1):
|
|
struct.pack_into('b', bytearray(1), 5, 1)
|
|
|
|
regex2 = (
|
|
r'unpack_from requires a buffer of at least 6 '
|
|
r'bytes for unpacking 1 bytes at offset 5 '
|
|
r'\(actual buffer size is 1\)'
|
|
)
|
|
with self.assertRaisesRegex(struct.error, regex2):
|
|
struct.unpack_from('b', bytearray(1), 5)
|
|
|
|
def test_boundary_error_message_with_negative_offset(self):
|
|
byte_list = bytearray(10)
|
|
with self.assertRaisesRegex(
|
|
struct.error,
|
|
r'no space to pack 4 bytes at offset -2'):
|
|
struct.pack_into('<I', byte_list, -2, 123)
|
|
|
|
with self.assertRaisesRegex(
|
|
struct.error,
|
|
'offset -11 out of range for 10-byte buffer'):
|
|
struct.pack_into('<B', byte_list, -11, 123)
|
|
|
|
with self.assertRaisesRegex(
|
|
struct.error,
|
|
r'not enough data to unpack 4 bytes at offset -2'):
|
|
struct.unpack_from('<I', byte_list, -2)
|
|
|
|
with self.assertRaisesRegex(
|
|
struct.error,
|
|
"offset -11 out of range for 10-byte buffer"):
|
|
struct.unpack_from('<B', byte_list, -11)
|
|
|
|
def test_boundary_error_message_with_large_offset(self):
|
|
# Test overflows cause by large offset and value size (issue 30245)
|
|
regex1 = (
|
|
r'pack_into requires a buffer of at least ' + str(sys.maxsize + 4) +
|
|
r' bytes for packing 4 bytes at offset ' + str(sys.maxsize) +
|
|
r' \(actual buffer size is 10\)'
|
|
)
|
|
with self.assertRaisesRegex(struct.error, regex1):
|
|
struct.pack_into('<I', bytearray(10), sys.maxsize, 1)
|
|
|
|
regex2 = (
|
|
r'unpack_from requires a buffer of at least ' + str(sys.maxsize + 4) +
|
|
r' bytes for unpacking 4 bytes at offset ' + str(sys.maxsize) +
|
|
r' \(actual buffer size is 10\)'
|
|
)
|
|
with self.assertRaisesRegex(struct.error, regex2):
|
|
struct.unpack_from('<I', bytearray(10), sys.maxsize)
|
|
|
|
def test_issue29802(self):
|
|
# When the second argument of struct.unpack() was of wrong type
|
|
# the Struct object was decrefed twice and the reference to
|
|
# deallocated object was left in a cache.
|
|
with self.assertRaises(TypeError):
|
|
struct.unpack('b', 0)
|
|
# Shouldn't crash.
|
|
self.assertEqual(struct.unpack('b', b'a'), (b'a'[0],))
|
|
|
|
def test_format_attr(self):
|
|
s = struct.Struct('=i2H')
|
|
self.assertEqual(s.format, '=i2H')
|
|
|
|
# use a bytes string
|
|
s2 = struct.Struct(s.format.encode())
|
|
self.assertEqual(s2.format, s.format)
|
|
|
|
@unittest.expectedFailure # TODO: RUSTPYTHON
|
|
def test_struct_cleans_up_at_runtime_shutdown(self):
|
|
code = """if 1:
|
|
import struct
|
|
|
|
class C:
|
|
def __init__(self):
|
|
self.pack = struct.pack
|
|
def __del__(self):
|
|
self.pack('I', -42)
|
|
|
|
struct.x = C()
|
|
"""
|
|
rc, stdout, stderr = assert_python_ok("-c", code)
|
|
self.assertEqual(rc, 0)
|
|
self.assertEqual(stdout.rstrip(), b"")
|
|
self.assertIn(b"Exception ignored while calling deallocator", stderr)
|
|
self.assertIn(b"C.__del__", stderr)
|
|
|
|
def test__struct_reference_cycle_cleaned_up(self):
|
|
# Regression test for python/cpython#94207.
|
|
|
|
# When we create a new struct module, trigger use of its cache,
|
|
# and then delete it ...
|
|
_struct_module = import_helper.import_fresh_module("_struct")
|
|
module_ref = weakref.ref(_struct_module)
|
|
_struct_module.calcsize("b")
|
|
del _struct_module
|
|
|
|
# Then the module should have been garbage collected.
|
|
gc.collect()
|
|
self.assertIsNone(
|
|
module_ref(), "_struct module was not garbage collected")
|
|
|
|
@support.cpython_only
|
|
def test__struct_types_immutable(self):
|
|
# See https://github.com/python/cpython/issues/94254
|
|
|
|
Struct = struct.Struct
|
|
unpack_iterator = type(struct.iter_unpack("b", b'x'))
|
|
for cls in (Struct, unpack_iterator):
|
|
with self.subTest(cls=cls):
|
|
with self.assertRaises(TypeError):
|
|
cls.x = 1
|
|
|
|
|
|
def test_issue35714(self):
|
|
# Embedded null characters should not be allowed in format strings.
|
|
for s in '\0', '2\0i', b'\0':
|
|
with self.assertRaisesRegex(struct.error,
|
|
'embedded null character'):
|
|
struct.calcsize(s)
|
|
|
|
@support.cpython_only
|
|
def test_issue98248(self):
|
|
def test_error_msg(prefix, int_type, is_unsigned):
|
|
fmt_str = prefix + int_type
|
|
size = struct.calcsize(fmt_str)
|
|
if is_unsigned:
|
|
max_ = 2 ** (size * 8) - 1
|
|
min_ = 0
|
|
else:
|
|
max_ = 2 ** (size * 8 - 1) - 1
|
|
min_ = -2 ** (size * 8 - 1)
|
|
error_msg = f"'{int_type}' format requires {min_} <= number <= {max_}"
|
|
for number in [int(-1e50), min_ - 1, max_ + 1, int(1e50)]:
|
|
with self.subTest(format_str=fmt_str, number=number):
|
|
with self.assertRaisesRegex(struct.error, error_msg):
|
|
struct.pack(fmt_str, number)
|
|
error_msg = "required argument is not an integer"
|
|
not_number = ""
|
|
with self.subTest(format_str=fmt_str, number=not_number):
|
|
with self.assertRaisesRegex(struct.error, error_msg):
|
|
struct.pack(fmt_str, not_number)
|
|
|
|
for prefix in '@=<>':
|
|
for int_type in 'BHILQ':
|
|
test_error_msg(prefix, int_type, True)
|
|
for int_type in 'bhilq':
|
|
test_error_msg(prefix, int_type, False)
|
|
|
|
int_type = 'N'
|
|
test_error_msg('@', int_type, True)
|
|
|
|
int_type = 'n'
|
|
test_error_msg('@', int_type, False)
|
|
|
|
@support.cpython_only
|
|
def test_issue98248_error_propagation(self):
|
|
class Div0:
|
|
def __index__(self):
|
|
1 / 0
|
|
|
|
def test_error_propagation(fmt_str):
|
|
with self.subTest(format_str=fmt_str, exception="ZeroDivisionError"):
|
|
with self.assertRaises(ZeroDivisionError):
|
|
struct.pack(fmt_str, Div0())
|
|
|
|
for prefix in '@=<>':
|
|
for int_type in 'BHILQbhilq':
|
|
test_error_propagation(prefix + int_type)
|
|
|
|
test_error_propagation('N')
|
|
test_error_propagation('n')
|
|
|
|
@unittest.expectedFailure # TODO: RUSTPYTHON
|
|
def test_struct_subclass_instantiation(self):
|
|
# Regression test for https://github.com/python/cpython/issues/112358
|
|
class MyStruct(struct.Struct):
|
|
def __init__(self):
|
|
super().__init__('>h')
|
|
|
|
my_struct = MyStruct()
|
|
self.assertEqual(my_struct.pack(12345), b'\x30\x39')
|
|
|
|
def test_repr(self):
|
|
s = struct.Struct('=i2H')
|
|
self.assertEqual(repr(s), f'Struct({s.format!r})')
|
|
|
|
@unittest.expectedFailure # TODO: RUSTPYTHON
|
|
def test_c_complex_round_trip(self):
|
|
values = [complex(*_) for _ in combinations([1, -1, 0.0, -0.0, 2,
|
|
-3, INF, -INF, NAN], 2)]
|
|
for z in values:
|
|
for f in ['F', 'D', '>F', '>D', '<F', '<D']:
|
|
with self.subTest(z=z, format=f):
|
|
round_trip = struct.unpack(f, struct.pack(f, z))[0]
|
|
self.assertComplexesAreIdentical(z, round_trip)
|
|
|
|
@unittest.skipIf(
|
|
support.is_android or support.is_apple_mobile,
|
|
"Subinterpreters are not supported on Android and iOS"
|
|
)
|
|
def test_endian_table_init_subinterpreters(self):
|
|
# Verify that the _struct extension module can be initialized
|
|
# concurrently in subinterpreters (gh-140260).
|
|
try:
|
|
from concurrent.futures import InterpreterPoolExecutor
|
|
except ImportError:
|
|
raise unittest.SkipTest("InterpreterPoolExecutor not available")
|
|
|
|
code = "import struct"
|
|
with InterpreterPoolExecutor(max_workers=5) as executor:
|
|
results = executor.map(exec, [code] * 5)
|
|
self.assertListEqual(list(results), [None] * 5)
|
|
|
|
@unittest.expectedFailure # TODO: RUSTPYTHON; TypeError: expected at least 1 arguments, got 0
|
|
def test_operations_on_half_initialized_Struct(self):
|
|
S = struct.Struct.__new__(struct.Struct)
|
|
|
|
spam = array.array('b', b' ')
|
|
self.assertRaises(RuntimeError, S.iter_unpack, spam)
|
|
self.assertRaises(RuntimeError, S.pack, 1)
|
|
self.assertRaises(RuntimeError, S.pack_into, spam, 1)
|
|
self.assertRaises(RuntimeError, S.unpack, spam)
|
|
self.assertRaises(RuntimeError, S.unpack_from, spam)
|
|
self.assertRaises(RuntimeError, getattr, S, 'format')
|
|
self.assertRaises(RuntimeError, S.__sizeof__)
|
|
self.assertRaises(RuntimeError, repr, S)
|
|
self.assertEqual(S.size, -1)
|
|
|
|
def test_float_round_trip(self):
|
|
for format in (
|
|
"f", "<f", ">f",
|
|
"d", "<d", ">d",
|
|
"e", "<e", ">e",
|
|
):
|
|
with self.subTest(format=format):
|
|
f = struct.unpack(format, struct.pack(format, 1.5))[0]
|
|
self.assertEqual(f, 1.5)
|
|
f = struct.unpack(format, struct.pack(format, NAN))[0]
|
|
self.assertTrue(math.isnan(f), f)
|
|
f = struct.unpack(format, struct.pack(format, INF))[0]
|
|
self.assertTrue(math.isinf(f), f)
|
|
self.assertEqual(math.copysign(1.0, f), 1.0)
|
|
f = struct.unpack(format, struct.pack(format, -INF))[0]
|
|
self.assertTrue(math.isinf(f), f)
|
|
self.assertEqual(math.copysign(1.0, f), -1.0)
|
|
|
|
|
|
class UnpackIteratorTest(unittest.TestCase):
|
|
"""
|
|
Tests for iterative unpacking (struct.Struct.iter_unpack).
|
|
"""
|
|
|
|
def test_construct(self):
|
|
def _check_iterator(it):
|
|
self.assertIsInstance(it, abc.Iterator)
|
|
self.assertIsInstance(it, abc.Iterable)
|
|
s = struct.Struct('>ibcp')
|
|
it = s.iter_unpack(b"")
|
|
_check_iterator(it)
|
|
it = s.iter_unpack(b"1234567")
|
|
_check_iterator(it)
|
|
# Wrong bytes length
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"123456")
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"12345678")
|
|
# Zero-length struct
|
|
s = struct.Struct('>')
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"")
|
|
with self.assertRaises(struct.error):
|
|
s.iter_unpack(b"12")
|
|
|
|
def test_uninstantiable(self):
|
|
iter_unpack_type = type(struct.Struct(">ibcp").iter_unpack(b""))
|
|
self.assertRaises(TypeError, iter_unpack_type)
|
|
|
|
def test_iterate(self):
|
|
s = struct.Struct('>IB')
|
|
b = bytes(range(1, 16))
|
|
it = s.iter_unpack(b)
|
|
self.assertEqual(next(it), (0x01020304, 5))
|
|
self.assertEqual(next(it), (0x06070809, 10))
|
|
self.assertEqual(next(it), (0x0b0c0d0e, 15))
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertRaises(StopIteration, next, it)
|
|
|
|
def test_arbitrary_buffer(self):
|
|
s = struct.Struct('>IB')
|
|
b = bytes(range(1, 11))
|
|
it = s.iter_unpack(memoryview(b))
|
|
self.assertEqual(next(it), (0x01020304, 5))
|
|
self.assertEqual(next(it), (0x06070809, 10))
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertRaises(StopIteration, next, it)
|
|
|
|
def test_length_hint(self):
|
|
lh = operator.length_hint
|
|
s = struct.Struct('>IB')
|
|
b = bytes(range(1, 16))
|
|
it = s.iter_unpack(b)
|
|
self.assertEqual(lh(it), 3)
|
|
next(it)
|
|
self.assertEqual(lh(it), 2)
|
|
next(it)
|
|
self.assertEqual(lh(it), 1)
|
|
next(it)
|
|
self.assertEqual(lh(it), 0)
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertEqual(lh(it), 0)
|
|
|
|
def test_module_func(self):
|
|
# Sanity check for the global struct.iter_unpack()
|
|
it = struct.iter_unpack('>IB', bytes(range(1, 11)))
|
|
self.assertEqual(next(it), (0x01020304, 5))
|
|
self.assertEqual(next(it), (0x06070809, 10))
|
|
self.assertRaises(StopIteration, next, it)
|
|
self.assertRaises(StopIteration, next, it)
|
|
|
|
def test_half_float(self):
|
|
_testcapi = import_helper.import_module('_testcapi')
|
|
# Little-endian examples from:
|
|
# http://en.wikipedia.org/wiki/Half_precision_floating-point_format
|
|
format_bits_float__cleanRoundtrip_list = [
|
|
(b'\x00\x3c', 1.0),
|
|
(b'\x00\xc0', -2.0),
|
|
(b'\xff\x7b', 65504.0), # (max half precision)
|
|
(b'\x00\x04', 2**-14), # ~= 6.10352 * 10**-5 (min pos normal)
|
|
(b'\x01\x00', 2**-24), # ~= 5.96046 * 10**-8 (min pos subnormal)
|
|
(b'\x00\x00', 0.0),
|
|
(b'\x00\x80', -0.0),
|
|
(b'\x00\x7c', float('+inf')),
|
|
(b'\x00\xfc', float('-inf')),
|
|
(b'\x55\x35', 0.333251953125), # ~= 1/3
|
|
]
|
|
|
|
for le_bits, f in format_bits_float__cleanRoundtrip_list:
|
|
be_bits = le_bits[::-1]
|
|
self.assertEqual(f, struct.unpack('<e', le_bits)[0])
|
|
self.assertEqual(le_bits, struct.pack('<e', f))
|
|
self.assertEqual(f, struct.unpack('>e', be_bits)[0])
|
|
self.assertEqual(be_bits, struct.pack('>e', f))
|
|
if sys.byteorder == 'little':
|
|
self.assertEqual(f, struct.unpack('e', le_bits)[0])
|
|
self.assertEqual(le_bits, struct.pack('e', f))
|
|
else:
|
|
self.assertEqual(f, struct.unpack('e', be_bits)[0])
|
|
self.assertEqual(be_bits, struct.pack('e', f))
|
|
|
|
# Check for NaN handling:
|
|
format_bits__nan_list = [
|
|
('<e', b'\x01\xfc'),
|
|
('<e', b'\x00\xfe'),
|
|
('<e', b'\xff\xff'),
|
|
('<e', b'\x01\x7c'),
|
|
('<e', b'\x00\x7e'),
|
|
('<e', b'\xff\x7f'),
|
|
]
|
|
|
|
for formatcode, bits in format_bits__nan_list:
|
|
self.assertTrue(math.isnan(struct.unpack('<e', bits)[0]))
|
|
self.assertTrue(math.isnan(struct.unpack('>e', bits[::-1])[0]))
|
|
|
|
# Check that packing produces a bit pattern representing a quiet NaN:
|
|
# all exponent bits and the msb of the fraction should all be 1.
|
|
if _testcapi.nan_msb_is_signaling:
|
|
# HP PA RISC and some MIPS CPUs use 0 for quiet, see:
|
|
# https://en.wikipedia.org/wiki/NaN#Encoding
|
|
expected = 0x7c
|
|
else:
|
|
expected = 0x7e
|
|
|
|
packed = struct.pack('<e', math.nan)
|
|
self.assertEqual(packed[1] & 0x7e, expected)
|
|
packed = struct.pack('<e', -math.nan)
|
|
self.assertEqual(packed[1] & 0x7e, expected)
|
|
|
|
# Checks for round-to-even behavior
|
|
format_bits_float__rounding_list = [
|
|
('>e', b'\x00\x01', 2.0**-25 + 2.0**-35), # Rounds to minimum subnormal
|
|
('>e', b'\x00\x00', 2.0**-25), # Underflows to zero (nearest even mode)
|
|
('>e', b'\x00\x00', 2.0**-26), # Underflows to zero
|
|
('>e', b'\x03\xff', 2.0**-14 - 2.0**-24), # Largest subnormal.
|
|
('>e', b'\x03\xff', 2.0**-14 - 2.0**-25 - 2.0**-65),
|
|
('>e', b'\x04\x00', 2.0**-14 - 2.0**-25),
|
|
('>e', b'\x04\x00', 2.0**-14), # Smallest normal.
|
|
('>e', b'\x3c\x01', 1.0+2.0**-11 + 2.0**-16), # rounds to 1.0+2**(-10)
|
|
('>e', b'\x3c\x00', 1.0+2.0**-11), # rounds to 1.0 (nearest even mode)
|
|
('>e', b'\x3c\x00', 1.0+2.0**-12), # rounds to 1.0
|
|
('>e', b'\x7b\xff', 65504), # largest normal
|
|
('>e', b'\x7b\xff', 65519), # rounds to 65504
|
|
('>e', b'\x80\x01', -2.0**-25 - 2.0**-35), # Rounds to minimum subnormal
|
|
('>e', b'\x80\x00', -2.0**-25), # Underflows to zero (nearest even mode)
|
|
('>e', b'\x80\x00', -2.0**-26), # Underflows to zero
|
|
('>e', b'\xbc\x01', -1.0-2.0**-11 - 2.0**-16), # rounds to 1.0+2**(-10)
|
|
('>e', b'\xbc\x00', -1.0-2.0**-11), # rounds to 1.0 (nearest even mode)
|
|
('>e', b'\xbc\x00', -1.0-2.0**-12), # rounds to 1.0
|
|
('>e', b'\xfb\xff', -65519), # rounds to 65504
|
|
]
|
|
|
|
for formatcode, bits, f in format_bits_float__rounding_list:
|
|
self.assertEqual(bits, struct.pack(formatcode, f))
|
|
|
|
# This overflows, and so raises an error
|
|
format_bits_float__roundingError_list = [
|
|
# Values that round to infinity.
|
|
('>e', 65520.0),
|
|
('>e', 65536.0),
|
|
('>e', 1e300),
|
|
('>e', -65520.0),
|
|
('>e', -65536.0),
|
|
('>e', -1e300),
|
|
('<e', 65520.0),
|
|
('<e', 65536.0),
|
|
('<e', 1e300),
|
|
('<e', -65520.0),
|
|
('<e', -65536.0),
|
|
('<e', -1e300),
|
|
]
|
|
|
|
for formatcode, f in format_bits_float__roundingError_list:
|
|
self.assertRaises(OverflowError, struct.pack, formatcode, f)
|
|
|
|
# Double rounding
|
|
format_bits_float__doubleRoundingError_list = [
|
|
('>e', b'\x67\xff', 0x1ffdffffff * 2**-26), # should be 2047, if double-rounded 64>32>16, becomes 2048
|
|
]
|
|
|
|
for formatcode, bits, f in format_bits_float__doubleRoundingError_list:
|
|
self.assertEqual(bits, struct.pack(formatcode, f))
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|