Add ability to query libxml version number

Author: jonathangreen

Diff for: src/main.c

@@ -121,11 +121,18 @@ static PyObject* PyXmlSec_PyShutdown(PyObject* self) {
 
 static char PyXmlSec_GetLibXmlSecVersion__doc__[] = \
     "get_libxmlsec_version() -> tuple\n"
-    "Returns Version tuple of wrapped libxml library.";
+    "Returns Version tuple of wrapped libxmlsec library.";
 static PyObject* PyXmlSec_GetLibXmlSecVersion() {
     return Py_BuildValue("(iii)", XMLSEC_VERSION_MAJOR, XMLSEC_VERSION_MINOR, XMLSEC_VERSION_SUBMINOR);
 }
 
+static char PyXmlSec_GetLibXmlVersion__doc__[] = \
+    "get_libxml_version() -> tuple\n"
+    "Returns Version tuple of wrapped libxml library.";
+static PyObject* PyXmlSec_GetLibXmlVersion() {
+    return Py_BuildValue("(iii)", XMLSEC_LIBXML_VERSION_MAJOR, XMLSEC_LIBXML_VERSION_MINOR, XMLSEC_LIBXML_VERSION_PATCH);
+}
+
 static char PyXmlSec_PyEnableDebugOutput__doc__[] = \
     "enable_debug_trace(enabled) -> None\n"
     "Enables or disables calling LibXML2 callback from the default errors callback.\n\n"
@@ -399,6 +406,12 @@ static PyMethodDef PyXmlSec_MainMethods[] = {
         METH_NOARGS,
         PyXmlSec_GetLibXmlSecVersion__doc__
     },
+    {
+        "get_libxml_version",
+        (PyCFunction)PyXmlSec_GetLibXmlVersion,
+        METH_NOARGS,
+        PyXmlSec_GetLibXmlVersion__doc__
+    },
     {
         "enable_debug_trace",
         (PyCFunction)PyXmlSec_PyEnableDebugOutput,

Diff for: src/platform.h

@@ -12,13 +12,20 @@
 
 #define PY_SSIZE_T_CLEAN 1
 
+#include <libxml/xmlversion.h>
 #include <xmlsec/version.h>
 #include <Python.h>
 
 #ifdef MS_WIN32
 #include <windows.h>
 #endif /* MS_WIN32 */
 
+#define XMLSEC_EXTRACT_VERSION(x, y) ((x / (y)) % 100)
+
+#define XMLSEC_LIBXML_VERSION_MAJOR XMLSEC_EXTRACT_VERSION(LIBXML_VERSION, 100 * 100)
+#define XMLSEC_LIBXML_VERSION_MINOR XMLSEC_EXTRACT_VERSION(LIBXML_VERSION, 100)
+#define XMLSEC_LIBXML_VERSION_PATCH XMLSEC_EXTRACT_VERSION(LIBXML_VERSION, 1)
+
 #define XMLSEC_VERSION_HEX ((XMLSEC_VERSION_MAJOR << 16) | (XMLSEC_VERSION_MINOR << 8) | (XMLSEC_VERSION_SUBMINOR))
 
 // XKMS support was removed in version 1.2.21