98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
/* See http://www.python-ldap.org/ for details.
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* $Id: berval.c,v 1.1 2009/08/17 01:49:47 leonard Exp $ */
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#include "common.h"
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#include "berval.h"
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/*
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* Converts a Python object into a data for a berval structure.
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*
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* New memory is allocated, and the content of the object is copied into it.
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* Then the (pre-existing) berval structure's field are filled in with pointer
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* and length data.
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*
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* The source object must implement the buffer interface, or be None.
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* If the source object is None, bv->bv_val will be set to NULL and bv_len to 0.
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* Otherwise, bv->bv_val will be non-NULL (even for zero-length data).
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* This allows the caller to distinguish a None argument as something special.
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*
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* Returns 0 on failure, leaving *bv unchanged, and setting an error.
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* Returns 1 on success: the berval must be freed with LDAPberval_release().
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*/
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int
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LDAPberval_from_object(PyObject *obj, struct berval *bv)
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{
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const void *data;
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char *datacp;
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Py_ssize_t len;
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if (PyNone_Check(obj)) {
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bv->bv_len = 0;
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bv->bv_val = NULL;
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return 1;
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}
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if (!PyObject_AsReadBuffer(obj, &data, &len))
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return 0;
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datacp = PyMem_MALLOC(len ? len : 1);
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if (!datacp) {
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PyErr_NoMemory();
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return 0;
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}
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memcpy(datacp, data, len);
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bv->bv_len = len;
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bv->bv_val = datacp;
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return 1;
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}
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/*
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* Returns true if the object could be used to initialize a berval structure
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* with LDAPberval_from_object()
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*/
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int
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LDAPberval_from_object_check(PyObject *obj)
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{
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return PyNone_Check(obj) ||
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PyObject_CheckReadBuffer(obj);
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}
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/*
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* Releases memory allocated by LDAPberval_from_object().
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* Has no effect if the berval pointer is NULL or the berval data is NULL.
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*/
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void
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LDAPberval_release(struct berval *bv) {
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if (bv && bv->bv_val) {
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PyMem_FREE(bv->bv_val);
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bv->bv_len = 0;
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bv->bv_val = NULL;
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}
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}
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/*
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* Copies out the data from a berval, and returns it as a new Python object,
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* Returns None if the berval pointer is NULL.
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*
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* Note that this function is not the exact inverse of LDAPberval_from_object
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* with regards to the NULL/None conversion.
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*
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* Returns a new Python object on success, or NULL on failure.
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*/
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PyObject *
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LDAPberval_to_object(const struct berval *bv)
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{
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PyObject *ret = NULL;
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if (!bv) {
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ret = Py_None;
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Py_INCREF(ret);
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}
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else {
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ret = PyString_FromStringAndSize(bv->bv_val, bv->bv_len);
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}
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return ret;
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}
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