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convert.c
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convert.c
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#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <npy_config.h>
#include "structmember.h"
#define NPY_NO_DEPRECATED_API NPY_API_VERSION
#define _MULTIARRAYMODULE
#include "array_assign.h"
#include "arrayobject.h"
#include "common.h"
#include "convert.h"
#include "ctors.h"
#include "lowlevel_strided_loops.h"
#include "mapping.h"
#include "npy_pycompat.h"
#include "numpy/arrayobject.h"
#include "numpy/arrayscalars.h"
#include "scalartypes.h"
int
fallocate(int fd, int mode, off_t offset, off_t len);
/*
* allocate nbytes of diskspace for file fp
* this allows the filesystem to make smarter allocation decisions and gives a
* fast exit on not enough free space
* returns -1 and raises exception on no space, ignores all other errors
*/
static int
npy_fallocate(npy_intp nbytes, FILE *fp)
{
/*
* unknown behavior on non-linux so don't try it
* we don't want explicit zeroing to happen
*/
#if defined(HAVE_FALLOCATE) && defined(__linux__)
int r;
/* small files not worth the system call */
if (nbytes < 16 * 1024 * 1024) {
return 0;
}
/* btrfs can take a while to allocate making release worthwhile */
NPY_BEGIN_ALLOW_THREADS;
/*
* flush in case there might be some unexpected interactions between the
* fallocate call and unwritten data in the descriptor
*/
fflush(fp);
/*
* the flag "1" (=FALLOC_FL_KEEP_SIZE) is needed for the case of files
* opened in append mode (issue #8329)
*/
r = fallocate(fileno(fp), 1, npy_ftell(fp), nbytes);
NPY_END_ALLOW_THREADS;
/*
* early exit on no space, other errors will also get found during fwrite
*/
if (r == -1 && errno == ENOSPC) {
PyErr_Format(
PyExc_IOError,
"Not enough free space to write "
"%" NPY_INTP_FMT " bytes",
nbytes);
return -1;
}
#endif
return 0;
}
/*
* Converts a subarray of 'self' into lists, with starting data pointer
* 'dataptr' and from dimension 'startdim' to the last dimension of 'self'.
*
* Returns a new reference.
*/
static PyObject *
recursive_tolist(PyArrayObject *self, char *dataptr, int startdim)
{
npy_intp i, n, stride;
PyObject *ret, *item;
/* Base case */
if (startdim >= PyArray_NDIM(self)) {
return PyArray_GETITEM(self, dataptr);
}
n = PyArray_DIM(self, startdim);
stride = PyArray_STRIDE(self, startdim);
ret = PyList_New(n);
if (ret == NULL) {
return NULL;
}
for (i = 0; i < n; ++i) {
item = recursive_tolist(self, dataptr, startdim + 1);
if (item == NULL) {
Py_DECREF(ret);
return NULL;
}
PyList_SET_ITEM(ret, i, item);
dataptr += stride;
}
return ret;
}
/*NUMPY_API
* To List
*/
NPY_NO_EXPORT PyObject *
PyArray_ToList(PyArrayObject *self)
{
return recursive_tolist(self, PyArray_DATA(self), 0);
}
/* XXX: FIXME --- add ordering argument to
Allow Fortran ordering on write
This will need the addition of a Fortran-order iterator.
*/
/*NUMPY_API
To File
*/
NPY_NO_EXPORT int
PyArray_ToFile(PyArrayObject *self, FILE *fp, char *sep, char *format)
{
npy_intp size;
npy_intp n, n2;
size_t n3, n4;
PyArrayIterObject *it;
PyObject *obj, *strobj, *tupobj, *byteobj;
n3 = (sep ? strlen((const char *)sep) : 0);
if (n3 == 0) {
/* binary data */
if (PyDataType_FLAGCHK(PyArray_DESCR(self), NPY_LIST_PICKLE)) {
PyErr_SetString(
PyExc_IOError,
"cannot write object arrays to a file in binary mode");
return -1;
}
if (PyArray_DESCR(self)->elsize == 0) {
/* For zero-width data types there's nothing to write */
return 0;
}
if (npy_fallocate(PyArray_NBYTES(self), fp) != 0) {
return -1;
}
if (PyArray_ISCONTIGUOUS(self)) {
size = PyArray_SIZE(self);
NPY_BEGIN_ALLOW_THREADS;
#if defined(_MSC_VER) && defined(_WIN64)
/* Workaround Win64 fwrite() bug. Ticket #1660 */
{
npy_intp maxsize = 2147483648 / PyArray_DESCR(self)->elsize;
npy_intp chunksize;
n = 0;
while (size > 0) {
chunksize = (size > maxsize) ? maxsize : size;
n2 = fwrite(
(const void *)((char *)PyArray_DATA(self) +
(n * PyArray_DESCR(self)->elsize)),
(size_t)PyArray_DESCR(self)->elsize,
(size_t)chunksize, fp);
if (n2 < chunksize) {
break;
}
n += n2;
size -= chunksize;
}
size = PyArray_SIZE(self);
}
#else
n = fwrite(
(const void *)PyArray_DATA(self),
(size_t)PyArray_DESCR(self)->elsize, (size_t)size, fp);
#endif
NPY_END_ALLOW_THREADS;
if (n < size) {
PyErr_Format(
PyExc_IOError, "%ld requested and %ld written",
(long)size, (long)n);
return -1;
}
}
else {
NPY_BEGIN_THREADS_DEF;
it = (PyArrayIterObject *)PyArray_IterNew((PyObject *)self);
NPY_BEGIN_THREADS;
while (it->index < it->size) {
if (fwrite((const void *)it->dataptr,
(size_t)PyArray_DESCR(self)->elsize, 1, fp) < 1) {
NPY_END_THREADS;
PyErr_Format(
PyExc_IOError,
"problem writing element %" NPY_INTP_FMT
" to file",
it->index);
Py_DECREF(it);
return -1;
}
PyArray_ITER_NEXT(it);
}
NPY_END_THREADS;
Py_DECREF(it);
}
}
else {
/*
* text data
*/
it = (PyArrayIterObject *)PyArray_IterNew((PyObject *)self);
n4 = (format ? strlen((const char *)format) : 0);
while (it->index < it->size) {
obj = PyArray_GETITEM(self, it->dataptr);
if (obj == NULL) {
Py_DECREF(it);
return -1;
}
if (n4 == 0) {
/*
* standard writing
*/
strobj = PyObject_Repr(obj);
Py_DECREF(obj);
if (strobj == NULL) {
Py_DECREF(it);
return -1;
}
}
else {
/*
* use format string
*/
tupobj = PyTuple_New(1);
if (tupobj == NULL) {
Py_DECREF(it);
return -1;
}
PyTuple_SET_ITEM(tupobj, 0, obj);
obj = PyUnicode_FromString((const char *)format);
if (obj == NULL) {
Py_DECREF(tupobj);
Py_DECREF(it);
return -1;
}
strobj = PyUnicode_Format(obj, tupobj);
Py_DECREF(obj);
Py_DECREF(tupobj);
if (strobj == NULL) {
Py_DECREF(it);
return -1;
}
}
byteobj = PyUnicode_AsASCIIString(strobj);
NPY_BEGIN_ALLOW_THREADS;
n2 = PyBytes_GET_SIZE(byteobj);
n = fwrite(PyBytes_AS_STRING(byteobj), 1, n2, fp);
NPY_END_ALLOW_THREADS;
Py_DECREF(byteobj);
if (n < n2) {
PyErr_Format(
PyExc_IOError,
"problem writing element %" NPY_INTP_FMT " to file",
it->index);
Py_DECREF(strobj);
Py_DECREF(it);
return -1;
}
/* write separator for all but last one */
if (it->index != it->size - 1) {
if (fwrite(sep, 1, n3, fp) < n3) {
PyErr_Format(
PyExc_IOError,
"problem writing separator to file");
Py_DECREF(strobj);
Py_DECREF(it);
return -1;
}
}
Py_DECREF(strobj);
PyArray_ITER_NEXT(it);
}
Py_DECREF(it);
}
return 0;
}
/*NUMPY_API*/
NPY_NO_EXPORT PyObject *
PyArray_ToString(PyArrayObject *self, NPY_ORDER order)
{
npy_intp numbytes;
npy_intp i;
char *dptr;
int elsize;
PyObject *ret;
PyArrayIterObject *it;
if (order == NPY_ANYORDER)
order = PyArray_ISFORTRAN(self);
/* if (PyArray_TYPE(self) == NPY_OBJECT) {
PyErr_SetString(PyExc_ValueError, "a string for the data" \
"in an object array is not appropriate");
return NULL;
}
*/
numbytes = PyArray_NBYTES(self);
if ((PyArray_IS_C_CONTIGUOUS(self) && (order == NPY_CORDER)) ||
(PyArray_IS_F_CONTIGUOUS(self) && (order == NPY_FORTRANORDER))) {
ret = PyBytes_FromStringAndSize(
PyArray_DATA(self), (Py_ssize_t)numbytes);
}
else {
PyObject *new;
if (order == NPY_FORTRANORDER) {
/* iterators are always in C-order */
new = PyArray_Transpose(self, NULL);
if (new == NULL) {
return NULL;
}
}
else {
Py_INCREF(self);
new = (PyObject *)self;
}
it = (PyArrayIterObject *)PyArray_IterNew(new);
Py_DECREF(new);
if (it == NULL) {
return NULL;
}
ret = PyBytes_FromStringAndSize(NULL, (Py_ssize_t)numbytes);
if (ret == NULL) {
Py_DECREF(it);
return NULL;
}
dptr = PyBytes_AS_STRING(ret);
i = it->size;
elsize = PyArray_DESCR(self)->elsize;
while (i--) {
memcpy(dptr, it->dataptr, elsize);
dptr += elsize;
PyArray_ITER_NEXT(it);
}
Py_DECREF(it);
}
return ret;
}
/*NUMPY_API*/
NPY_NO_EXPORT int
PyArray_FillWithScalar(PyArrayObject *arr, PyObject *obj)
{
PyArray_Descr *dtype = NULL;
npy_longlong value_buffer[4];
char *value = NULL;
int retcode = 0;
/*
* If 'arr' is an object array, copy the object as is unless
* 'obj' is a zero-dimensional array, in which case we copy
* the element in that array instead.
*/
if (PyArray_DESCR(arr)->type_num == NPY_OBJECT &&
!(PyArray_Check(obj) && PyArray_NDIM((PyArrayObject *)obj) == 0)) {
value = (char *)&obj;
dtype = PyArray_DescrFromType(NPY_OBJECT);
if (dtype == NULL) {
return -1;
}
}
/* NumPy scalar */
else if (PyArray_IsScalar(obj, Generic)) {
dtype = PyArray_DescrFromScalar(obj);
if (dtype == NULL) {
return -1;
}
value = scalar_value(obj, dtype);
if (value == NULL) {
Py_DECREF(dtype);
return -1;
}
}
/* Python boolean */
else if (PyBool_Check(obj)) {
value = (char *)value_buffer;
*value = (obj == Py_True);
dtype = PyArray_DescrFromType(NPY_BOOL);
if (dtype == NULL) {
return -1;
}
}
/* Python integer */
else if (PyLong_Check(obj)) {
/* Try long long before unsigned long long */
npy_longlong ll_v = PyLong_AsLongLong(obj);
if (error_converting(ll_v)) {
/* Long long failed, try unsigned long long */
npy_ulonglong ull_v;
PyErr_Clear();
ull_v = PyLong_AsUnsignedLongLong(obj);
if (ull_v == (unsigned long long)-1 && PyErr_Occurred()) {
return -1;
}
value = (char *)value_buffer;
*(npy_ulonglong *)value = ull_v;
dtype = PyArray_DescrFromType(NPY_ULONGLONG);
if (dtype == NULL) {
return -1;
}
}
else {
/* Long long succeeded */
value = (char *)value_buffer;
*(npy_longlong *)value = ll_v;
dtype = PyArray_DescrFromType(NPY_LONGLONG);
if (dtype == NULL) {
return -1;
}
}
}
/* Python float */
else if (PyFloat_Check(obj)) {
npy_double v = PyFloat_AsDouble(obj);
if (error_converting(v)) {
return -1;
}
value = (char *)value_buffer;
*(npy_double *)value = v;
dtype = PyArray_DescrFromType(NPY_DOUBLE);
if (dtype == NULL) {
return -1;
}
}
/* Python complex */
else if (PyComplex_Check(obj)) {
npy_double re, im;
re = PyComplex_RealAsDouble(obj);
if (error_converting(re)) {
return -1;
}
im = PyComplex_ImagAsDouble(obj);
if (error_converting(im)) {
return -1;
}
value = (char *)value_buffer;
((npy_double *)value)[0] = re;
((npy_double *)value)[1] = im;
dtype = PyArray_DescrFromType(NPY_CDOUBLE);
if (dtype == NULL) {
return -1;
}
}
/* Use the value pointer we got if possible */
if (value != NULL) {
/* TODO: switch to SAME_KIND casting */
retcode = PyArray_AssignRawScalar(
arr, dtype, value, NULL, NPY_UNSAFE_CASTING);
Py_DECREF(dtype);
return retcode;
}
/* Otherwise convert to an array to do the assignment */
else {
PyArrayObject *src_arr;
/**
* The dtype of the destination is used when converting
* from the pyobject, so that for example a tuple gets
* recognized as a struct scalar of the required type.
*/
Py_INCREF(PyArray_DTYPE(arr));
src_arr = (PyArrayObject *)PyArray_FromAny(
obj, PyArray_DTYPE(arr), 0, 0, 0, NULL);
if (src_arr == NULL) {
return -1;
}
if (PyArray_NDIM(src_arr) != 0) {
PyErr_SetString(
PyExc_ValueError,
"Input object to FillWithScalar is not a scalar");
Py_DECREF(src_arr);
return -1;
}
retcode = PyArray_CopyInto(arr, src_arr);
Py_DECREF(src_arr);
return retcode;
}
}
/*
* Fills an array with zeros.
*
* dst: The destination array.
* wheremask: If non-NULL, a boolean mask specifying where to set the values.
*
* Returns 0 on success, -1 on failure.
*/
NPY_NO_EXPORT int
PyArray_AssignZero(PyArrayObject *dst, PyArrayObject *wheremask)
{
npy_bool value;
PyArray_Descr *bool_dtype;
int retcode;
/* Create a raw bool scalar with the value False */
bool_dtype = PyArray_DescrFromType(NPY_BOOL);
if (bool_dtype == NULL) {
return -1;
}
value = 0;
retcode = PyArray_AssignRawScalar(
dst, bool_dtype, (char *)&value, wheremask, NPY_SAFE_CASTING);
Py_DECREF(bool_dtype);
return retcode;
}
/*NUMPY_API
* Copy an array.
*/
NPY_NO_EXPORT PyObject *
PyArray_NewCopy(PyArrayObject *obj, NPY_ORDER order)
{
PyArrayObject *ret;
ret = (PyArrayObject *)PyArray_NewLikeArray(obj, order, NULL, 1);
if (ret == NULL) {
return NULL;
}
if (PyArray_AssignArray(ret, obj, NULL, NPY_UNSAFE_CASTING) < 0) {
Py_DECREF(ret);
return NULL;
}
return (PyObject *)ret;
}
/*NUMPY_API
* View
* steals a reference to type -- accepts NULL
*/
NPY_NO_EXPORT PyObject *
PyArray_View(PyArrayObject *self, PyArray_Descr *type, PyTypeObject *pytype)
{
PyArrayObject *ret = NULL;
PyArray_Descr *dtype;
PyTypeObject *subtype;
int flags;
if (pytype) {
subtype = pytype;
}
else {
subtype = Py_TYPE(self);
}
dtype = PyArray_DESCR(self);
flags = PyArray_FLAGS(self);
Py_INCREF(dtype);
ret = (PyArrayObject *)PyArray_NewFromDescr_int(
subtype, dtype, PyArray_NDIM(self), PyArray_DIMS(self),
PyArray_STRIDES(self), PyArray_DATA(self), flags, (PyObject *)self,
(PyObject *)self, 0, 1);
if (ret == NULL) {
Py_XDECREF(type);
return NULL;
}
if (type != NULL) {
if (PyObject_SetAttrString(
(PyObject *)ret, "dtype", (PyObject *)type) < 0) {
Py_DECREF(ret);
Py_DECREF(type);
return NULL;
}
Py_DECREF(type);
}
return (PyObject *)ret;
}