Added _xdr module
diff --git a/Modules/_xdrmodule.c b/Modules/_xdrmodule.c
new file mode 100644
index 0000000..27a8d5c
--- /dev/null
+++ b/Modules/_xdrmodule.c
@@ -0,0 +1,167 @@
+/* This module exports part of the C API to the XDR routines into Python.
+ * XDR is Sun's eXternal Data Representation, as described in RFC 1014. This
+ * module is used by xdrlib.py to support the float and double data types
+ * which are too much of a pain to support in Python directly. It is
+ * not required by xdrlib.py -- when not available, these types aren't
+ * supported at the Python layer. Note that representations that can be
+ * implemented solely in Python, are *not* reproduced here.
+ *
+ * Module version number: 1.0
+ *
+ * See xdrlib.py for usage notes.
+ *
+ * Note: this has so far, only been tested on Solaris 2.5 and SGI IRIX 5.3.
+ * On these systems, you will need to link with -lnsl for these
+ * symbols to be defined.
+ */
+
+#include "Python.h"
+
+#include <netconfig.h>
+#include <rpc/rpc.h>
+#include <rpc/xdr.h>
+
+static PyObject* xdr_error;
+
+
+
+static PyObject*
+pack_float(self, args)
+ PyObject* self;
+ PyObject* args;
+{
+ XDR xdr;
+ float value;
+ union { /* guarantees proper alignment */
+ long dummy;
+ char buffer[4];
+ } addr;
+ PyObject* rtn = NULL;
+
+ if (!PyArg_ParseTuple(args, "f", &value))
+ return NULL;
+
+ xdrmem_create(&xdr, addr.buffer, 4, XDR_ENCODE);
+ if (xdr_float(&xdr, &value))
+ rtn = PyString_FromStringAndSize(addr.buffer, 4);
+ else
+ PyErr_SetString(xdr_error, "conversion from float failed");
+
+ xdr_destroy(&xdr);
+ return rtn;
+}
+
+static PyObject*
+pack_double(self, args)
+ PyObject* self;
+ PyObject* args;
+{
+ XDR xdr;
+ double value;
+ union { /* guarantees proper alignment */
+ long dummy;
+ char buffer[8];
+ } addr;
+ PyObject* rtn = NULL;
+
+ if (!PyArg_ParseTuple(args, "d", &value))
+ return NULL;
+
+ xdrmem_create(&xdr, addr.buffer, 8, XDR_ENCODE);
+ if (xdr_double(&xdr, &value))
+ rtn = PyString_FromStringAndSize(addr.buffer, 8);
+ else
+ PyErr_SetString(xdr_error, "conversion from double failed");
+
+ xdr_destroy(&xdr);
+ return rtn;
+}
+
+
+
+static PyObject*
+unpack_float(self, args)
+ PyObject* self;
+ PyObject* args;
+{
+ XDR xdr;
+ float value;
+ char* string;
+ int strlen;
+ PyObject* rtn = NULL;
+
+ if (!PyArg_ParseTuple(args, "s#", &string, &strlen))
+ return NULL;
+
+ if (strlen != 4) {
+ PyErr_SetString(PyExc_ValueError, "4 byte string expected");
+ return NULL;
+ }
+
+ /* Python guarantees that the string is 4 byte aligned */
+ xdrmem_create(&xdr, (caddr_t)string, 4, XDR_DECODE);
+ if (xdr_float(&xdr, &value))
+ rtn = Py_BuildValue("f", value);
+ else
+ PyErr_SetString(xdr_error, "conversion to float failed");
+
+ xdr_destroy(&xdr);
+ return rtn;
+}
+
+
+static PyObject*
+unpack_double(self, args)
+ PyObject* self;
+ PyObject* args;
+{
+ XDR xdr;
+ double value;
+ char* string;
+ int strlen;
+ PyObject* rtn;
+
+ if (!PyArg_ParseTuple(args, "s#", &string, &strlen))
+ return NULL;
+
+ if (strlen != 8) {
+ PyErr_SetString(PyExc_ValueError, "8 byte string expected");
+ return NULL;
+ }
+
+ /* Python guarantees that the string is 4 byte aligned */
+ xdrmem_create(&xdr, (caddr_t)string, 8, XDR_DECODE);
+ if (xdr_double(&xdr, &value))
+ rtn = Py_BuildValue("d", value);
+ else
+ PyErr_SetString(xdr_error, "conversion to double failed");
+
+ xdr_destroy(&xdr);
+ return rtn;
+}
+
+
+
+static struct PyMethodDef
+xdr_methods[] = {
+ {"pack_float", pack_float, 1},
+ {"pack_double", pack_double, 1},
+ {"unpack_float", unpack_float, 1},
+ {"unpack_double", unpack_double, 1},
+ {NULL, NULL, 0} /* sentinel */
+};
+
+
+
+void
+init_xdr()
+{
+ PyObject* module;
+ PyObject* dict;
+
+ module = Py_InitModule("_xdr", xdr_methods);
+ dict = PyModule_GetDict(module);
+
+ xdr_error = PyString_FromString("_xdr.error");
+ PyDict_SetItemString(dict, "error", xdr_error);
+}