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access raw field buffer

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This commit is contained in:
Michael Davidsaver
2013-03-28 08:46:50 -04:00
parent cf079a35d2
commit 395564ad24
1 changed files with 50 additions and 0 deletions
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50
devsupApp/src/dbfield.c
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@ -164,6 +164,54 @@ static PyMethodDef pyField_methods[] = {
{NULL, NULL, 0, NULL}
};
static Py_ssize_t pyField_buf_getcount(pyField *self, Py_ssize_t *totallen)
{
if(totallen)
*totallen = self->addr.field_size * self->addr.no_elements;
return 1;
}
static Py_ssize_t pyField_buf_getbuf(pyField *self, Py_ssize_t bufid, void **data)
{
if(bufid!=0) {
PyErr_SetString(PyExc_SystemError, "Requested invalid segment");
return -1;
}
*data = self->addr.pfield;
return 0;
}
static Py_ssize_t pyField_buf_getcharbuf(pyField *self, Py_ssize_t bufid, char **data)
{
if(bufid!=0) {
PyErr_SetString(PyExc_SystemError, "Requested invalid segment");
return -1;
}
if(self->addr.field_size!=1) {
PyErr_SetString(PyExc_TypeError, "Field type must be CHAR or UCHAR");
return -1;
}
*data = self->addr.pfield;
return 0;
}
static int pyField_buf_getbufferproc(pyField *self, Py_buffer *buf, int flags)
{
return PyBuffer_FillInfo(buf, (PyObject*)self,
self->addr.pfield,
self->addr.field_size * self->addr.no_elements,
0, flags);
}
static PyBufferProcs pyField_buf_methods = {
(readbufferproc)pyField_buf_getbuf,
(writebufferproc)pyField_buf_getbuf,
(segcountproc)pyField_buf_getcount,
(charbufferproc)pyField_buf_getcharbuf,
(getbufferproc)pyField_buf_getbufferproc,
(releasebufferproc)NULL,
};
static PyTypeObject pyField_type = {
PyObject_HEAD_INIT(NULL)
@ -175,7 +223,9 @@ static PyTypeObject pyField_type = {
int pyField_prepare(void)
{
pyField_type.tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE;
pyField_type.tp_flags |= Py_TPFLAGS_HAVE_GETCHARBUFFER|Py_TPFLAGS_HAVE_NEWBUFFER;
pyField_type.tp_methods = pyField_methods;
pyField_type.tp_as_buffer = &pyField_buf_methods;
pyField_type.tp_init = (initproc)pyField_Init;
pyField_type.tp_new = PyType_GenericNew;