mirror of https://github.com/python/cpython.git
Obsolete, now that xdrlib.py uses the new-and-improved struct module.
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Barry Warsaw
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41317d120d
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/* This module exports part of the C API to the XDR routines into Python.
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* XDR is Sun's eXternal Data Representation, as described in RFC 1014.
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* This module is used by xdrlib.py to support the float and double data
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* types which are too much of a pain to support in Python directly. It is
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* not required by xdrlib.py -- when not available, these types aren't
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* supported at the Python layer. Note that representations that can be
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* implemented solely in Python, are *not* reproduced here.
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*
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* Module version number: 1.0
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*
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* See xdrlib.py for usage notes.
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*
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* Note: this has so far, only been tested on Solaris 2.5 and IRIX 5.3. On
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* these systems, you will need to link with -lnsl for these symbols to be
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* defined.
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*/
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#include "Python.h"
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#include <rpc/rpc.h>
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#include <rpc/xdr.h>
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static PyObject* xdr_error;
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static PyObject*
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pack_float(self, args)
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PyObject* self;
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PyObject* args;
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{
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XDR xdr;
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float value;
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union { /* guarantees proper alignment */
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long dummy;
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char buffer[4];
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} addr;
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PyObject* rtn = NULL;
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if (!PyArg_ParseTuple(args, "f", &value))
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return NULL;
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xdr.x_ops = NULL;
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xdrmem_create(&xdr, addr.buffer, 4, XDR_ENCODE);
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if (xdr.x_ops == NULL)
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PyErr_SetString(xdr_error,
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"XDR stream initialization failed.");
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else if (xdr_float(&xdr, &value))
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rtn = PyString_FromStringAndSize(addr.buffer, 4);
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else
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PyErr_SetString(xdr_error, "conversion from float failed");
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xdr_destroy(&xdr);
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return rtn;
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}
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static PyObject*
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pack_double(self, args)
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PyObject* self;
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PyObject* args;
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{
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XDR xdr;
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double value;
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union { /* guarantees proper alignment */
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long dummy;
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char buffer[8];
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} addr;
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PyObject* rtn = NULL;
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if (!PyArg_ParseTuple(args, "d", &value))
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return NULL;
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xdr.x_ops = NULL;
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xdrmem_create(&xdr, addr.buffer, 8, XDR_ENCODE);
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if (xdr.x_ops == NULL)
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PyErr_SetString(xdr_error,
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"XDR stream initialization failed.");
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else if (xdr_double(&xdr, &value))
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rtn = PyString_FromStringAndSize(addr.buffer, 8);
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else
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PyErr_SetString(xdr_error, "conversion from double failed");
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xdr_destroy(&xdr);
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return rtn;
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}
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static PyObject*
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unpack_float(self, args)
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PyObject* self;
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PyObject* args;
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{
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XDR xdr;
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float value;
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char* string;
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int strlen;
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PyObject* rtn = NULL;
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if (!PyArg_ParseTuple(args, "s#", &string, &strlen))
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return NULL;
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if (strlen != 4) {
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PyErr_SetString(PyExc_ValueError, "4 byte string expected");
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return NULL;
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}
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/* Python guarantees that the string is 4 byte aligned */
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xdr.x_ops = NULL;
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xdrmem_create(&xdr, (caddr_t)string, 4, XDR_DECODE);
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if (xdr.x_ops == NULL)
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PyErr_SetString(xdr_error,
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"XDR stream initialization failed.");
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else if (xdr_float(&xdr, &value))
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rtn = Py_BuildValue("f", value);
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else
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PyErr_SetString(xdr_error, "conversion to float failed");
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xdr_destroy(&xdr);
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return rtn;
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}
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static PyObject*
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unpack_double(self, args)
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PyObject* self;
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PyObject* args;
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{
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XDR xdr;
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double value;
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char* string;
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int strlen;
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PyObject* rtn = NULL;
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if (!PyArg_ParseTuple(args, "s#", &string, &strlen))
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return NULL;
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if (strlen != 8) {
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PyErr_SetString(PyExc_ValueError, "8 byte string expected");
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return NULL;
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}
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/* Python guarantees that the string is 4 byte aligned */
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xdr.x_ops = NULL;
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xdrmem_create(&xdr, (caddr_t)string, 8, XDR_DECODE);
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if (xdr.x_ops == NULL)
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PyErr_SetString(xdr_error,
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"XDR stream initialization failed.");
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else if (xdr_double(&xdr, &value))
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rtn = Py_BuildValue("d", value);
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else
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PyErr_SetString(xdr_error, "conversion to double failed");
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xdr_destroy(&xdr);
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return rtn;
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}
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static struct PyMethodDef
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xdr_methods[] = {
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{"pack_float", pack_float, 1},
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{"pack_double", pack_double, 1},
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{"unpack_float", unpack_float, 1},
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{"unpack_double", unpack_double, 1},
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{NULL, NULL, 0} /* sentinel */
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};
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void
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init_xdr()
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{
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PyObject* module;
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PyObject* dict;
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module = Py_InitModule("_xdr", xdr_methods);
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dict = PyModule_GetDict(module);
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xdr_error = PyString_FromString("_xdr.error");
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PyDict_SetItemString(dict, "error", xdr_error);
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if (PyErr_Occurred())
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Py_FatalError("can't initialize module _xdr");
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}
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