python: Implement data callbacks.

* lang/python/gpgme.i (object_to_gpgme_t): Set exception on error.
* lang/python/helpers.c (pyDataReadCb): New function.
(pyDataWriteCb): Likewise.
(pyDataSeekCb): Likewise.
(pyDataReleaseCb): Likewise.
(pygpgme_data_new_from_cbs): Likewise.
* lang/python/helpers.h (pygpgme_data_new_from_cbs): New prototype.
* lang/python/pyme/core.py (Data.__init__): Fix docstring, fix read
callbacks.
(Data.__del__): Fix read callbacks.
(Data._free_readcb): Drop function.
(Data._free_datacbs): New function.
(Data.new_from_cbs): Fix setting the callbacks.
(Data.write): Raise stashed exceptions.
(Data.read): Likewise.
* lang/python/tests/t-callbacks.py: Test new functionality.
* lang/python/tests/t-data.py: Likewise.

Signed-off-by: Justus Winter <[email protected]>

1 files changed, 5 insertions, 2 deletions

diff --git a/lang/python/gpgme.i b/lang/python/gpgme.i
index 84bc6e98..5b3c193b 100644
--- a/lang/python/gpgme.i
+++ b/lang/python/gpgme.i
@@ -180,10 +180,13 @@ PyObject* object_to_gpgme_t(PyObject* input, const char* objtype, int argnum) {
 			gpgme_data_t pubkey, gpgme_data_t seckey,
 			gpgme_data_t out};
 
-// SWIG has problem interpreting ssize_t, off_t or gpgme_error_t in gpgme.h
+/* SWIG has problems interpreting ssize_t, off_t or gpgme_error_t in
+   gpgme.h.  */
+/* XXX: This is wrong at least for off_t if compiled with LFS.  */
 %typemap(out) ssize_t, off_t, gpgme_error_t, gpgme_err_code_t, gpgme_err_source_t, gpg_error_t {
   $result = PyLong_FromLong($1);
 }
+/* XXX: This is wrong at least for off_t if compiled with LFS.  */
 %typemap(in) ssize_t, off_t, gpgme_error_t, gpgme_err_code_t, gpgme_err_source_t, gpg_error_t {
   $1 = PyLong_AsLong($input);
 }
@@ -201,7 +204,7 @@ PyObject* object_to_gpgme_t(PyObject* input, const char* objtype, int argnum) {
   Py_XDECREF($result);   /* Blow away any previous result */
   if (result < 0) {      /* Check for I/O error */
     free($1);
-    return NULL;
+    return PyErr_SetFromErrno(PyExc_RuntimeError);
   }
   $result = PyBytes_FromStringAndSize($1,result);
   free($1);