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#include <Python.h>
#include <Rdefines.h>
#include "rpy_rinterface.h"
#include "buffer.h"
static int
sexp_rank(SEXP sexp)
{
/* Return the number of dimensions for the buffer
* (e.g., a vector will return 1, a matrix 2, ...)
*/
SEXP dim = getAttrib(sexp, R_DimSymbol);
if (dim == R_NilValue)
return 1;
return GET_LENGTH(dim);
}
static void
sexp_shape(SEXP sexp, Py_intptr_t *shape, int nd)
{
/* Set the buffer 'shape', that is a vector of Py_intptr_t
* containing the size of each dimension (see sexp_rank).
*/
int i;
SEXP dim = getAttrib(sexp, R_DimSymbol);
if (dim == R_NilValue)
shape[0] = LENGTH(sexp);
else for (i = 0; i < nd; i++) {
shape[i] = INTEGER(dim)[i];
}
}
static void
sexp_strides(SEXP sexp, Py_intptr_t *strides, Py_ssize_t itemsize,
Py_intptr_t *shape, int nd)
{
/* Set the buffer 'strides', that is a vector or Py_intptr_t
* containing the offset (in bytes) when progressing along
* each dimension.
*/
int i;
strides[0] = itemsize;
for (i = 1; i < nd; i++) {
strides[i] = shape[i-1] * itemsize;
}
}
#if PY_VERSION_HEX >= 0x02060000
static int
VectorSexp_getbuffer(PyObject *obj, Py_buffer *view, int flags)
{
printf("getbuffer\n");
if (view == NULL) {
return 0;
}
if ((flags & PyBUF_F_CONTIGUOUS) == PyBUF_F_CONTIGUOUS) {
PyErr_SetString(PyExc_ValueError, "Only FORTRAN-style contiguous arrays allowed.");
return -1;
}
view->obj = obj;
if (obj) {
Py_INCREF(obj);
}
view->readonly = 0;
PySexpObject *self = (PySexpObject *)obj;
SEXP sexp = RPY_SEXP(self);
switch (TYPEOF(sexp)) {
case REALSXP:
view->buf = NUMERIC_POINTER(sexp);
view->len = GET_LENGTH(sexp) * sizeof(double);
view->itemsize = sizeof(double);
view->format = "f";
break;
case INTSXP:
view->buf = INTEGER_POINTER(sexp);
view->len = GET_LENGTH(sexp) * sizeof(int);
view->itemsize = sizeof(int);
view->format = "i";
break;
case LGLSXP:
view->buf = LOGICAL_POINTER(sexp);
view->len = GET_LENGTH(sexp) * sizeof(int);
view->itemsize = sizeof(int);
view->format = "i";
break;
case CPLXSXP:
view->buf = COMPLEX_POINTER(sexp);
view->len = GET_LENGTH(sexp) * sizeof(Rcomplex);
view->itemsize = sizeof(Rcomplex);
view->format = "B"; /* FIXME: correct format for complex ? */
break;
case RAWSXP:
view->buf = RAW_POINTER(sexp);
view->len = GET_LENGTH(sexp);
view->itemsize = 1;
view->format = "B";
break;
default:
PyErr_Format(PyExc_ValueError, "Buffer for this type not yet supported.");
return -1;
}
view->ndim = sexp_rank(sexp);
view->shape = NULL;
if ((flags & PyBUF_ND) == PyBUF_ND) {
view->shape = (Py_intptr_t*)PyMem_Malloc(sizeof(Py_intptr_t) * view->ndim);
sexp_shape(sexp, view->shape, view->ndim);
}
view->strides = NULL;
if ((flags & PyBUF_STRIDES) == PyBUF_STRIDES) {
view->strides = (Py_intptr_t*)PyMem_Malloc(sizeof(Py_intptr_t) * view->ndim);
sexp_strides(sexp, view->strides, view->itemsize, view->shape, view->ndim);
}
/* view->suboffsets = (Py_intptr_t*)PyMem_Malloc(sizeof(Py_intptr_t) * view->ndim); */
/* int i; */
/* for (i = 0; i < view->ndim; i++) { */
/* view->suboffsets[i] = 0; */
/* } */
view->suboffsets = NULL;
view->internal = NULL;
return 0;
}
#endif
static Py_ssize_t
VectorSexp_getsegcount(PySexpObject *self, Py_ssize_t *lenp)
{
printf("getsegcount\n");
SEXP sexp = RPY_SEXP(self);
switch (TYPEOF(sexp)) {
case REALSXP:
*lenp = GET_LENGTH(sexp) * sizeof(double);
break;
case INTSXP:
*lenp = GET_LENGTH(sexp) * sizeof(int);
break;
case LGLSXP:
*lenp = GET_LENGTH(sexp) * sizeof(int);
break;
case CPLXSXP:
*lenp = GET_LENGTH(sexp) * sizeof(Rcomplex);
break;
case RAWSXP:
*lenp = GET_LENGTH(sexp) * 1;
break;
default:
PyErr_Format(PyExc_ValueError, "Buffer for this type not yet supported.");
*lenp = 0;
return -1;
}
return 0;
}
static Py_ssize_t
VectorSexp_getreadbuf(PySexpObject *self, Py_ssize_t segment, void **ptrptr)
{
printf("getreadbuf\n");
if (segment != 0) {
PyErr_SetString(PyExc_ValueError,
"accessing non-existing data segment");
return -1;
}
SEXP sexp = RPY_SEXP(self);
Py_ssize_t len;
switch (TYPEOF(sexp)) {
case REALSXP:
*ptrptr = NUMERIC_POINTER(sexp);
len = GET_LENGTH(sexp) * sizeof(double);
break;
case INTSXP:
*ptrptr = INTEGER_POINTER(sexp);
len = GET_LENGTH(sexp) * sizeof(int);
break;
case LGLSXP:
*ptrptr = LOGICAL_POINTER(sexp);
len = GET_LENGTH(sexp) * sizeof(int);
break;
case CPLXSXP:
*ptrptr = COMPLEX_POINTER(sexp);
len = GET_LENGTH(sexp) * sizeof(Rcomplex);
break;
case RAWSXP:
*ptrptr = RAW_POINTER(sexp);
len = GET_LENGTH(sexp) * 1;
break;
default:
PyErr_Format(PyExc_ValueError, "Buffer for this type not yet supported.");
*ptrptr = NULL;
return -1;
}
return 0;
}
static Py_ssize_t
VectorSexp_getwritebuf(PySexpObject *self, Py_ssize_t segment, void **ptrptr)
{
printf("getwritebuf\n");
/*FIXME: introduce a "writeable" flag for SexpVector objects ? */
return VectorSexp_getreadbuf(self, segment, (void **)ptrptr);
}
static Py_ssize_t
VectorSexp_getcharbuf(PySexpObject *self, Py_ssize_t segment, const char **ptrptr)
{
/*FIXME: introduce a "writeable" flag for SexpVector objects ? */
return VectorSexp_getreadbuf(self, segment, (void **)ptrptr);
}
static PyBufferProcs VectorSexp_as_buffer = {
(readbufferproc)VectorSexp_getreadbuf,
(writebufferproc)VectorSexp_getwritebuf,
(segcountproc)VectorSexp_getsegcount,
(charbufferproc)VectorSexp_getcharbuf,
#if PY_VERSION_HEX >= 0x02060000
(getbufferproc)VectorSexp_getbuffer,
(releasebufferproc)0,
#endif
};
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