bpo-40302: Add pycore_byteswap.h header file (GH-19552)

Add a new internal pycore_byteswap.h header file with the following
functions:

* _Py_bswap16()
* _Py_bswap32()
* _Py_bswap64()

Use these functions in _ctypes, sha256 and sha512 modules,
and also use in the UTF-32 encoder.

sha256, sha512 and _ctypes modules are now built with the internal
C API.

1 files changed, 8 insertions, 0 deletions

diff --git a/Lib/test/test_capi.py b/Lib/test/test_capi.py
index 0243439..f9578d3 100644
--- a/Lib/test/test_capi.py
+++ b/Lib/test/test_capi.py
@@ -24,6 +24,8 @@ except ImportError:
 # Skip this test if the _testcapi module isn't available.
 _testcapi = support.import_module('_testcapi')
 
+import _testinternalcapi
+
 # Were we compiled --with-pydebug or with #define Py_DEBUG?
 Py_DEBUG = hasattr(sys, 'gettotalrefcount')
 
@@ -658,6 +660,12 @@ class Test_testcapi(unittest.TestCase):
                     if name.startswith('test_') and not name.endswith('_code'))
 
 
+class Test_testinternalcapi(unittest.TestCase):
+    locals().update((name, getattr(_testinternalcapi, name))
+                    for name in dir(_testinternalcapi)
+                    if name.startswith('test_'))
+
+
 class PyMemDebugTests(unittest.TestCase):
     PYTHONMALLOC = 'debug'
     # '0x04c06e0' or '04C06E0'