Revert rev 30607 -- Zope trunk actually does still use ZODB's _Persistence.c,

although ZODB doesn't.

NEWS.txt

-What's new in ZODB3 3.4b5?
+What's new in ZODB3 3.4b4?
 ==========================
 Release date: DD-MMM-2005
 
@@ -6,7 +6,7 @@ Following is combined news from the "internal releases" (to support
 ongoing Zope 2.8 and Zope3 development) since the last public ZODB 3.4
 release.  These are the dates of the internal releases:
 
-- 3.4b4 02-Jun-2005
+- 3.4b4 DD-MMM-2005
 - 3.4b3 27-May-2005
 - 3.4b2 26-May-2005
 
@@ -33,13 +33,6 @@ Development
   ``zope.testing.testrunner``.  See the latter's documentation
   for command-line arguments.
 
-_Persistence.c
---------------
-
-- (3.4b4) The source code for this was removed from the project.  Zope (2.8)
-  has its own copy, and the C code hadn't been compiled in ZODB since before
-  ZODB 3.3.
-
 Error reporting
 ---------------
 

src/Persistence/_Persistence.c

+/*
+
+ Copyright (c) 2003 Zope Corporation and Contributors.
+ All Rights Reserved.
+
+ This software is subject to the provisions of the Zope Public License,
+ Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+ THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+ WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+ FOR A PARTICULAR PURPOSE.
+
+*/
+static char _Persistence_module_documentation[] = 
+"Persistent ExtensionClass\n"
+"\n"
+"$Id$\n"
+;
+
+#include "ExtensionClass.h"
+#include "cPersistence.h"
+
+
+/* convert_name() returns a new reference to a string name
+   or sets an exception and returns NULL.
+*/
+
+static PyObject *
+convert_name(PyObject *name)
+{
+#ifdef Py_USING_UNICODE
+    /* The Unicode to string conversion is done here because the
+       existing tp_setattro slots expect a string object as name
+       and we wouldn't want to break those. */
+    if (PyUnicode_Check(name)) {
+	name = PyUnicode_AsEncodedString(name, NULL, NULL);
+    }
+    else
+#endif
+    if (!PyString_Check(name)) {
+	PyErr_SetString(PyExc_TypeError, "attribute name must be a string");
+	return NULL;
+    } else
+	Py_INCREF(name);
+    return name;
+}
+
+/* Returns true if the object requires unghostification.
+
+   There are several special attributes that we allow access to without
+   requiring that the object be unghostified:
+   __class__
+   __del__
+   __dict__
+   __of__
+   __setstate__
+*/
+
+static int
+unghost_getattr(const char *s)
+{
+    if (*s++ != '_')
+	return 1;
+    if (*s == 'p') {
+	s++;
+	if (*s == '_')
+	    return 0; /* _p_ */
+	else
+	    return 1;
+    }
+    else if (*s == '_') {
+	s++;
+	switch (*s) {
+	case 'c':
+	    return strcmp(s, "class__");
+	case 'd':
+	    s++;
+	    if (!strcmp(s, "el__"))
+		return 0; /* __del__ */
+	    if (!strcmp(s, "ict__"))
+		return 0; /* __dict__ */
+	    return 1;
+	case 'o':
+	    return strcmp(s, "of__");
+	case 's':
+	    return strcmp(s, "setstate__");
+	default:
+	    return 1;
+	}
+    }
+    return 1;
+}
+
+static PyObject *
+P_getattr(cPersistentObject *self, PyObject *name)
+{
+  PyObject *v=NULL;
+  char *s;
+
+  name = convert_name(name);
+  if (!name)
+    return NULL;
+
+  s = PyString_AS_STRING(name);
+
+  if (*s != '_' || unghost_getattr(s)) 
+    {
+      if (PER_USE(self))
+        {
+          v = Py_FindAttr((PyObject*)self, name);
+          PER_ALLOW_DEACTIVATION(self);
+          PER_ACCESSED(self);
+        }
+    }
+  else
+    v = Py_FindAttr((PyObject*)self, name);
+
+  Py_DECREF(name);
+
+  return v;
+}
+
+
+static PyTypeObject Ptype = {
+	PyObject_HEAD_INIT(NULL)
+	/* ob_size           */ 0,
+	/* tp_name           */ "Persistence.Persistent",
+        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+        /* tp_getattro       */ (getattrofunc)P_getattr,
+        0, 0,
+        /* tp_flags          */ Py_TPFLAGS_DEFAULT
+				| Py_TPFLAGS_BASETYPE ,
+	/* tp_doc            */ "Persistent ExtensionClass",
+};
+
+static struct PyMethodDef _Persistence_methods[] = {
+	{NULL,	 (PyCFunction)NULL, 0, NULL}		/* sentinel */
+};
+
+#ifndef PyMODINIT_FUNC	/* declarations for DLL import/export */
+#define PyMODINIT_FUNC void
+#endif
+PyMODINIT_FUNC
+init_Persistence(void)
+{
+  PyObject *m;
+        
+  if (! ExtensionClassImported)
+    return;
+
+  cPersistenceCAPI = PyCObject_Import("persistent.cPersistence", "CAPI");
+  if (cPersistenceCAPI == NULL)
+    return;
+
+  Ptype.tp_bases = Py_BuildValue("OO", cPersistenceCAPI->pertype, ECBaseType);
+  if (Ptype.tp_bases == NULL)
+    return;
+  Ptype.tp_base = cPersistenceCAPI->pertype;
+  
+  Ptype.ob_type = ECExtensionClassType;
+  if (PyType_Ready(&Ptype) < 0)
+    return;
+        
+  /* Create the module and add the functions */
+  m = Py_InitModule3("_Persistence", _Persistence_methods,
+                     _Persistence_module_documentation);
+  
+  if (m == NULL)
+    return;
+  
+  /* Add types: */
+  if (PyModule_AddObject(m, "Persistent", (PyObject *)&Ptype) < 0)
+    return;
+}
+