[Python-checkins] cpython (2.7): Issue #23319: Fix ctypes.BigEndianStructure, swap correctly bytes. Patch
victor.stinner
python-checkins at python.org
Wed Jul 29 14:37:33 CEST 2015
https://hg.python.org/cpython/rev/88f2c4f12b56
changeset: 97122:88f2c4f12b56
branch: 2.7
parent: 97112:8afd995802a6
user: Victor Stinner <victor.stinner at gmail.com>
date: Wed Jul 29 14:37:17 2015 +0200
summary:
Issue #23319: Fix ctypes.BigEndianStructure, swap correctly bytes. Patch
written by Matthieu Gautier.
files:
Lib/ctypes/test/test_bitfields.py | 28 +++++++++++++++++++
Misc/NEWS | 3 ++
Modules/_ctypes/cfield.c | 1 +
3 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/Lib/ctypes/test/test_bitfields.py b/Lib/ctypes/test/test_bitfields.py
--- a/Lib/ctypes/test/test_bitfields.py
+++ b/Lib/ctypes/test/test_bitfields.py
@@ -259,5 +259,33 @@
x.a = 0xFEDCBA9876543211
self.assertEqual(x.a, 0xFEDCBA9876543211)
+ @need_symbol('c_uint32')
+ def test_uint32_swap_little_endian(self):
+ # Issue #23319
+ class Little(LittleEndianStructure):
+ _fields_ = [("a", c_uint32, 24),
+ ("b", c_uint32, 4),
+ ("c", c_uint32, 4)]
+ b = bytearray(4)
+ x = Little.from_buffer(b)
+ x.a = 0xabcdef
+ x.b = 1
+ x.c = 2
+ self.assertEqual(b, b'\xef\xcd\xab\x21')
+
+ @need_symbol('c_uint32')
+ def test_uint32_swap_big_endian(self):
+ # Issue #23319
+ class Big(BigEndianStructure):
+ _fields_ = [("a", c_uint32, 24),
+ ("b", c_uint32, 4),
+ ("c", c_uint32, 4)]
+ b = bytearray(4)
+ x = Big.from_buffer(b)
+ x.a = 0xabcdef
+ x.b = 1
+ x.c = 2
+ self.assertEqual(b, b'\xab\xcd\xef\x12')
+
if __name__ == "__main__":
unittest.main()
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -34,6 +34,9 @@
Library
-------
+- Issue #23319: Fix ctypes.BigEndianStructure, swap correctly bytes. Patch
+ written by Matthieu Gautier.
+
- Issue #23254: Document how to close the TCPServer listening socket.
Patch from Martin Panter.
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -769,6 +769,7 @@
if (get_ulong(value, &val) < 0)
return NULL;
memcpy(&field, ptr, sizeof(field));
+ field = SWAP_INT(field);
field = SET(unsigned int, field, (unsigned int)val, size);
field = SWAP_INT(field);
memcpy(ptr, &field, sizeof(field));
--
Repository URL: https://hg.python.org/cpython
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