Add toBytes() and BufferProtocol

VoidPtr:
Add toBytes() method that return a char* representation
of the void* pointer.

QByteArray:
The current implementation only provided the Buffer Protocol
for Python2, this patch includes the getbuffer implementation
for Python3.

Having a BufferProtocol implementation for Python3 allows the
initialization of VoidPtr to get access to the internal content,
so one can go back and forward with the representation of it:

    ba = QByteArray(b"Hello World")
    vp = VoidPtr(ba, ba.size())
    vp.toBytes() # b"Hello World"

The BufferProtocol was also changed for Python2 including the new
buffer protocol (Py_TPFLAGS_HAVE_NEWBUFFER) function `bf_getbuffer`.

A test case was included.

Fixes: PYSIDE-934
Change-Id: I8936966da91b2dcc879c582cfc35e6a35f7a60b6
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

1 files changed, 15 insertions, 3 deletions

diff --git a/sources/pyside2/tests/support/voidptr_test.py b/sources/pyside2/tests/support/voidptr_test.py
index 330788c63..c04022489 100644
--- a/sources/pyside2/tests/support/voidptr_test.py
+++ b/sources/pyside2/tests/support/voidptr_test.py
@@ -38,9 +38,21 @@ class PySide2Support(unittest.TestCase):
         # a C++ object, a wrapped Shiboken Object type,
         # an object implementing the Python Buffer interface,
         # or another VoidPtr object.
-        ba = QByteArray(b"Hello world")
-        voidptr = VoidPtr(ba)
-        self.assertIsInstance(voidptr, shiboken.VoidPtr)
+
+        # Original content
+        b = b"Hello world"
+        ba = QByteArray(b)
+        vp = VoidPtr(ba, ba.size())
+        self.assertIsInstance(vp, shiboken.VoidPtr)
+
+        # Create QByteArray from voidptr byte interpretation
+        nba = QByteArray.fromRawData(vp.toBytes())
+        # Compare original bytes to toBytes()
+        self.assertTrue(b, vp.toBytes())
+        # Compare original with new QByteArray data
+        self.assertTrue(b, nba.data())
+        # Convert original and new to str
+        self.assertTrue(str(b), str(nba))
 
 if __name__ == '__main__':
     unittest.main()