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dtype_transfer.c
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dtype_transfer.c
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/*
* This file contains low-level loops for data type transfers.
* In particular the function PyArray_GetDTypeTransferFunction is
* implemented here.
*
* Copyright (c) 2010 by Mark Wiebe (mwwiebe@gmail.com)
* The University of British Columbia
*
* See LICENSE.txt for the license.
*
*/
#define NPY_NO_DEPRECATED_API NPY_API_VERSION
#define _MULTIARRAYMODULE
#define _UMATHMODULE
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <structmember.h>
#include "numpy/arrayobject.h"
#include "numpy/npy_math.h"
#include "lowlevel_strided_loops.h"
#include "npy_pycompat.h"
#include "convert_datatype.h"
#include "ctors.h"
#include "_datetime.h"
#include "datetime_strings.h"
#include "descriptor.h"
#include "array_assign.h"
#include "shape.h"
#include "dtype_transfer.h"
#include "alloc.h"
#include "dtypemeta.h"
#include "array_method.h"
#include "array_coercion.h"
#include "umathmodule.h"
#define NPY_LOWLEVEL_BUFFER_BLOCKSIZE 128
/********** PRINTF DEBUG TRACING **************/
#define NPY_DT_DBG_TRACING 0
/* Tracing incref/decref can be very noisy */
#define NPY_DT_REF_DBG_TRACING 0
#if NPY_DT_REF_DBG_TRACING
#define NPY_DT_DBG_REFTRACE(msg, ref) \
printf("%-12s %20p %s%d%s\n", msg, ref, \
ref ? "(refcnt " : "", \
ref ? (int)ref->ob_refcnt : 0, \
ref ? ((ref->ob_refcnt <= 0) ? \
") <- BIG PROBLEM!!!!" : ")") : ""); \
fflush(stdout);
#else
#define NPY_DT_DBG_REFTRACE(msg, ref)
#endif
/**********************************************/
#if NPY_DT_DBG_TRACING
/*
* Thin wrapper around print that ignores exceptions
*/
static void
_safe_print(PyObject *obj)
{
if (PyObject_Print(obj, stdout, 0) < 0) {
PyErr_Clear();
printf("<error during print>");
}
}
#endif
/*
* Returns a transfer function which DECREFs any references in src_type.
*
* Returns NPY_SUCCEED or NPY_FAIL.
*/
static int
get_decref_transfer_function(int aligned,
npy_intp src_stride,
PyArray_Descr *src_dtype,
NPY_cast_info *cast_info,
int *out_needs_api);
/*************************** COPY REFERENCES *******************************/
/* Moves references from src to dst */
NPY_NO_EXPORT int
_strided_to_strided_move_references(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *NPY_UNUSED(auxdata))
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
PyObject *src_ref = NULL, *dst_ref = NULL;
while (N > 0) {
memcpy(&src_ref, src, sizeof(src_ref));
memcpy(&dst_ref, dst, sizeof(dst_ref));
/* Release the reference in dst */
NPY_DT_DBG_REFTRACE("dec dst ref", dst_ref);
Py_XDECREF(dst_ref);
/* Move the reference */
NPY_DT_DBG_REFTRACE("move src ref", src_ref);
memcpy(dst, &src_ref, sizeof(src_ref));
/* Set the source reference to NULL */
src_ref = NULL;
memcpy(src, &src_ref, sizeof(src_ref));
src += src_stride;
dst += dst_stride;
--N;
}
return 0;
}
/* Copies references from src to dst */
NPY_NO_EXPORT int
_strided_to_strided_copy_references(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *NPY_UNUSED(auxdata))
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
PyObject *src_ref = NULL, *dst_ref = NULL;
while (N > 0) {
memcpy(&src_ref, src, sizeof(src_ref));
memcpy(&dst_ref, dst, sizeof(dst_ref));
/* Copy the reference */
NPY_DT_DBG_REFTRACE("copy src ref", src_ref);
memcpy(dst, &src_ref, sizeof(src_ref));
/* Claim the reference */
Py_XINCREF(src_ref);
/* Release the reference in dst */
NPY_DT_DBG_REFTRACE("dec dst ref", dst_ref);
Py_XDECREF(dst_ref);
src += src_stride;
dst += dst_stride;
--N;
}
return 0;
}
/************************** ANY TO OBJECT *********************************/
typedef struct {
NpyAuxData base;
PyArray_GetItemFunc *getitem;
PyArrayObject_fields arr_fields;
NPY_cast_info decref_src;
} _any_to_object_auxdata;
static void
_any_to_object_auxdata_free(NpyAuxData *auxdata)
{
_any_to_object_auxdata *data = (_any_to_object_auxdata *)auxdata;
Py_DECREF(data->arr_fields.descr);
NPY_cast_info_xfree(&data->decref_src);
PyMem_Free(data);
}
static NpyAuxData *
_any_to_object_auxdata_clone(NpyAuxData *auxdata)
{
_any_to_object_auxdata *data = (_any_to_object_auxdata *)auxdata;
_any_to_object_auxdata *res = PyMem_Malloc(sizeof(_any_to_object_auxdata));
res->base = data->base;
res->getitem = data->getitem;
res->arr_fields = data->arr_fields;
Py_INCREF(res->arr_fields.descr);
if (data->decref_src.func != NULL) {
if (NPY_cast_info_copy(&res->decref_src, &data->decref_src) < 0) {
NPY_AUXDATA_FREE((NpyAuxData *)res);
return NULL;
}
}
else {
res->decref_src.func = NULL;
}
return (NpyAuxData *)res;
}
static int
_strided_to_strided_any_to_object(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_any_to_object_auxdata *data = (_any_to_object_auxdata *)auxdata;
PyObject *dst_ref = NULL;
char *orig_src = src;
while (N > 0) {
memcpy(&dst_ref, dst, sizeof(dst_ref));
Py_XDECREF(dst_ref);
dst_ref = data->getitem(src, &data->arr_fields);
memcpy(dst, &dst_ref, sizeof(PyObject *));
if (dst_ref == NULL) {
return -1;
}
src += src_stride;
dst += dst_stride;
--N;
}
if (data->decref_src.func != NULL) {
/* If necessary, clear the input buffer (`move_references`) */
if (data->decref_src.func(&data->decref_src.context,
&orig_src, &N, &src_stride, data->decref_src.auxdata) < 0) {
return -1;
}
}
return 0;
}
NPY_NO_EXPORT int
any_to_object_get_loop(
PyArrayMethod_Context *context,
int aligned, int move_references,
const npy_intp *strides,
PyArrayMethod_StridedLoop **out_loop,
NpyAuxData **out_transferdata,
NPY_ARRAYMETHOD_FLAGS *flags)
{
*flags = NPY_METH_REQUIRES_PYAPI; /* No need for floating point errors */
*out_loop = _strided_to_strided_any_to_object;
*out_transferdata = PyMem_Malloc(sizeof(_any_to_object_auxdata));
if (*out_transferdata == NULL) {
return -1;
}
_any_to_object_auxdata *data = (_any_to_object_auxdata *)*out_transferdata;
data->base.free = &_any_to_object_auxdata_free;
data->base.clone = &_any_to_object_auxdata_clone;
data->arr_fields.base = NULL;
Py_SET_TYPE(&data->arr_fields, NULL);
data->arr_fields.descr = context->descriptors[0];
Py_INCREF(data->arr_fields.descr);
data->arr_fields.flags = aligned ? NPY_ARRAY_ALIGNED : 0;
data->arr_fields.nd = 0;
data->getitem = context->descriptors[0]->f->getitem;
NPY_cast_info_init(&data->decref_src);
if (move_references && PyDataType_REFCHK(context->descriptors[0])) {
int needs_api;
if (get_decref_transfer_function(
aligned, strides[0], context->descriptors[0],
&data->decref_src,
&needs_api) == NPY_FAIL) {
NPY_AUXDATA_FREE(*out_transferdata);
*out_transferdata = NULL;
return -1;
}
}
return 0;
}
/************************** OBJECT TO ANY *********************************/
typedef struct {
NpyAuxData base;
PyArray_Descr *descr;
int move_references;
} _object_to_any_auxdata;
static void
_object_to_any_auxdata_free(NpyAuxData *auxdata)
{
_object_to_any_auxdata *data = (_object_to_any_auxdata *)auxdata;
Py_DECREF(data->descr);
PyMem_Free(data);
}
static NpyAuxData *
_object_to_any_auxdata_clone(NpyAuxData *data)
{
_object_to_any_auxdata *res = PyMem_Malloc(sizeof(*res));
if (res == NULL) {
return NULL;
}
memcpy(res, data, sizeof(*res));
Py_INCREF(res->descr);
return (NpyAuxData *)res;
}
static int
strided_to_strided_object_to_any(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_object_to_any_auxdata *data = (_object_to_any_auxdata *)auxdata;
PyObject *src_ref;
while (N > 0) {
memcpy(&src_ref, src, sizeof(src_ref));
if (PyArray_Pack(data->descr, dst, src_ref ? src_ref : Py_None) < 0) {
return -1;
}
if (data->move_references && src_ref != NULL) {
Py_DECREF(src_ref);
memset(src, 0, sizeof(src_ref));
}
N--;
dst += dst_stride;
src += src_stride;
}
return 0;
}
NPY_NO_EXPORT int
object_to_any_get_loop(
PyArrayMethod_Context *context,
int NPY_UNUSED(aligned), int move_references,
const npy_intp *NPY_UNUSED(strides),
PyArrayMethod_StridedLoop **out_loop,
NpyAuxData **out_transferdata,
NPY_ARRAYMETHOD_FLAGS *flags)
{
*flags = NPY_METH_REQUIRES_PYAPI;
/* NOTE: auxdata is only really necessary to flag `move_references` */
_object_to_any_auxdata *data = PyMem_Malloc(sizeof(*data));
if (data == NULL) {
return -1;
}
data->base.free = &_object_to_any_auxdata_free;
data->base.clone = &_object_to_any_auxdata_clone;
Py_INCREF(context->descriptors[1]);
data->descr = context->descriptors[1];
data->move_references = move_references;
*out_transferdata = (NpyAuxData *)data;
*out_loop = &strided_to_strided_object_to_any;
return 0;
}
/************************** ZERO-PADDED COPY ******************************/
/*
* Does a strided to strided zero-padded copy for the case where
* dst_itemsize > src_itemsize
*/
static int
_strided_to_strided_zero_pad_copy(
PyArrayMethod_Context *context, char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *NPY_UNUSED(auxdata))
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
npy_intp src_itemsize = context->descriptors[0]->elsize;
npy_intp dst_itemsize = context->descriptors[1]->elsize;
npy_intp zero_size = dst_itemsize-src_itemsize;
while (N > 0) {
memcpy(dst, src, src_itemsize);
memset(dst + src_itemsize, 0, zero_size);
src += src_stride;
dst += dst_stride;
--N;
}
return 0;
}
/*
* Does a strided to strided zero-padded copy for the case where
* dst_itemsize < src_itemsize
*/
static int
_strided_to_strided_truncate_copy(
PyArrayMethod_Context *context, char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *NPY_UNUSED(auxdata))
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
npy_intp dst_itemsize = context->descriptors[1]->elsize;
while (N > 0) {
memcpy(dst, src, dst_itemsize);
src += src_stride;
dst += dst_stride;
--N;
}
return 0;
}
/*
* Does a strided to strided zero-padded or truncated copy for the case where
* unicode swapping is needed.
*/
static int
_strided_to_strided_unicode_copyswap(
PyArrayMethod_Context *context, char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *NPY_UNUSED(auxdata))
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
npy_intp src_itemsize = context->descriptors[0]->elsize;
npy_intp dst_itemsize = context->descriptors[1]->elsize;
npy_intp zero_size = dst_itemsize - src_itemsize;
npy_intp copy_size = zero_size > 0 ? src_itemsize : dst_itemsize;
char *_dst;
npy_intp characters = dst_itemsize / 4;
int i;
while (N > 0) {
memcpy(dst, src, copy_size);
if (zero_size > 0) {
memset(dst + src_itemsize, 0, zero_size);
}
_dst = dst;
for (i=0; i < characters; i++) {
npy_bswap4_unaligned(_dst);
_dst += 4;
}
src += src_stride;
dst += dst_stride;
--N;
}
return 0;
}
NPY_NO_EXPORT int
PyArray_GetStridedZeroPadCopyFn(int aligned, int unicode_swap,
npy_intp src_stride, npy_intp dst_stride,
npy_intp src_itemsize, npy_intp dst_itemsize,
PyArrayMethod_StridedLoop **out_stransfer,
NpyAuxData **out_transferdata)
{
*out_transferdata = NULL;
if ((src_itemsize == dst_itemsize) && !unicode_swap) {
*out_stransfer = PyArray_GetStridedCopyFn(aligned, src_stride,
dst_stride, src_itemsize);
return (*out_stransfer == NULL) ? NPY_FAIL : NPY_SUCCEED;
}
else {
if (unicode_swap) {
*out_stransfer = &_strided_to_strided_unicode_copyswap;
}
else if (src_itemsize < dst_itemsize) {
*out_stransfer = &_strided_to_strided_zero_pad_copy;
}
else {
*out_stransfer = &_strided_to_strided_truncate_copy;
}
return NPY_SUCCEED;
}
}
/*************************** WRAP DTYPE COPY/SWAP *************************/
/* Wraps the dtype copy swap function */
typedef struct {
NpyAuxData base;
PyArray_CopySwapNFunc *copyswapn;
int swap;
PyArrayObject *arr;
} _wrap_copy_swap_data;
/* wrap copy swap data free function */
static void _wrap_copy_swap_data_free(NpyAuxData *data)
{
_wrap_copy_swap_data *d = (_wrap_copy_swap_data *)data;
Py_DECREF(d->arr);
PyMem_Free(data);
}
/* wrap copy swap data copy function */
static NpyAuxData *_wrap_copy_swap_data_clone(NpyAuxData *data)
{
_wrap_copy_swap_data *newdata =
(_wrap_copy_swap_data *)PyMem_Malloc(sizeof(_wrap_copy_swap_data));
if (newdata == NULL) {
return NULL;
}
memcpy(newdata, data, sizeof(_wrap_copy_swap_data));
Py_INCREF(newdata->arr);
return (NpyAuxData *)newdata;
}
static int
_strided_to_strided_wrap_copy_swap(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_wrap_copy_swap_data *d = (_wrap_copy_swap_data *)auxdata;
/* We assume that d->copyswapn should not be able to error. */
d->copyswapn(dst, dst_stride, src, src_stride, N, d->swap, d->arr);
return 0;
}
/*
* This function is used only via `get_wrapped_legacy_cast_function`
* when we wrap a legacy DType (or explicitly fall back to the legacy
* wrapping) for an internal cast.
*/
static int
wrap_copy_swap_function(
PyArray_Descr *dtype, int should_swap,
PyArrayMethod_StridedLoop **out_stransfer,
NpyAuxData **out_transferdata)
{
/* Allocate the data for the copy swap */
_wrap_copy_swap_data *data = PyMem_Malloc(sizeof(_wrap_copy_swap_data));
if (data == NULL) {
PyErr_NoMemory();
*out_stransfer = NULL;
*out_transferdata = NULL;
return NPY_FAIL;
}
data->base.free = &_wrap_copy_swap_data_free;
data->base.clone = &_wrap_copy_swap_data_clone;
data->copyswapn = dtype->f->copyswapn;
data->swap = should_swap;
/*
* TODO: This is a hack so the copyswap functions have an array.
* The copyswap functions shouldn't need that.
*/
Py_INCREF(dtype);
npy_intp shape = 1;
data->arr = (PyArrayObject *)PyArray_NewFromDescr_int(
&PyArray_Type, dtype,
1, &shape, NULL, NULL,
0, NULL, NULL,
0, 1);
if (data->arr == NULL) {
PyMem_Free(data);
return NPY_FAIL;
}
*out_stransfer = &_strided_to_strided_wrap_copy_swap;
*out_transferdata = (NpyAuxData *)data;
return NPY_SUCCEED;
}
/*************************** DTYPE CAST FUNCTIONS *************************/
/* Does a simple aligned cast */
typedef struct {
NpyAuxData base;
PyArray_VectorUnaryFunc *castfunc;
PyArrayObject *aip, *aop;
npy_bool needs_api;
} _strided_cast_data;
/* strided cast data free function */
static void _strided_cast_data_free(NpyAuxData *data)
{
_strided_cast_data *d = (_strided_cast_data *)data;
Py_DECREF(d->aip);
Py_DECREF(d->aop);
PyMem_Free(data);
}
/* strided cast data copy function */
static NpyAuxData *_strided_cast_data_clone(NpyAuxData *data)
{
_strided_cast_data *newdata =
(_strided_cast_data *)PyMem_Malloc(sizeof(_strided_cast_data));
if (newdata == NULL) {
return NULL;
}
memcpy(newdata, data, sizeof(_strided_cast_data));
Py_INCREF(newdata->aip);
Py_INCREF(newdata->aop);
return (NpyAuxData *)newdata;
}
static int
_aligned_strided_to_strided_cast(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_strided_cast_data *d = (_strided_cast_data *)auxdata;
PyArray_VectorUnaryFunc *castfunc = d->castfunc;
PyArrayObject *aip = d->aip, *aop = d->aop;
npy_bool needs_api = d->needs_api;
while (N > 0) {
castfunc(src, dst, 1, aip, aop);
/*
* Since error handling in ufuncs is not ideal (at the time of
* writing this, an error could be in process before calling this
* function. For most of NumPy history these checks were completely
* missing, so this is hopefully OK for the time being (until ufuncs
* are fixed).
*/
if (needs_api && PyErr_Occurred()) {
return -1;
}
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
/* This one requires src be of type NPY_OBJECT */
static int
_aligned_strided_to_strided_cast_decref_src(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_any_to_object_auxdata *data = (_any_to_object_auxdata *)auxdata;
_strided_cast_data *d = (_strided_cast_data *)data;
PyArray_VectorUnaryFunc *castfunc = d->castfunc;
PyArrayObject *aip = d->aip, *aop = d->aop;
npy_bool needs_api = d->needs_api;
PyObject *src_ref;
while (N > 0) {
castfunc(src, dst, 1, aip, aop);
/*
* See comment in `_aligned_strided_to_strided_cast`, an error could
* in principle be set before `castfunc` is called.
*/
if (needs_api && PyErr_Occurred()) {
return -1;
}
/* After casting, decrement the source ref and set it to NULL */
memcpy(&src_ref, src, sizeof(src_ref));
Py_XDECREF(src_ref);
memset(src, 0, sizeof(PyObject *));
NPY_DT_DBG_REFTRACE("dec src ref (cast object -> not object)", src_ref);
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
static int
_aligned_contig_to_contig_cast(
PyArrayMethod_Context *NPY_UNUSED(context), char * const*args,
const npy_intp *dimensions, const npy_intp *NPY_UNUSED(strides),
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
_strided_cast_data *d = (_strided_cast_data *)auxdata;
npy_bool needs_api = d->needs_api;
d->castfunc(src, dst, N, d->aip, d->aop);
/*
* See comment in `_aligned_strided_to_strided_cast`, an error could
* in principle be set before `castfunc` is called.
*/
if (needs_api && PyErr_Occurred()) {
return -1;
}
return 0;
}
/*
* Does a datetime->datetime, timedelta->timedelta,
* datetime->ascii, or ascii->datetime cast
*/
typedef struct {
NpyAuxData base;
/* The conversion fraction */
npy_int64 num, denom;
/* For the datetime -> string conversion, the dst string length */
npy_intp src_itemsize, dst_itemsize;
/*
* A buffer of size 'src_itemsize + 1', for when the input
* string is exactly of length src_itemsize with no NULL
* terminator.
*/
char *tmp_buffer;
/*
* The metadata for when dealing with Months or Years
* which behave non-linearly with respect to the other
* units.
*/
PyArray_DatetimeMetaData src_meta, dst_meta;
} _strided_datetime_cast_data;
/* strided datetime cast data free function */
static void _strided_datetime_cast_data_free(NpyAuxData *data)
{
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)data;
PyMem_Free(d->tmp_buffer);
PyMem_Free(data);
}
/* strided datetime cast data copy function */
static NpyAuxData *_strided_datetime_cast_data_clone(NpyAuxData *data)
{
_strided_datetime_cast_data *newdata =
(_strided_datetime_cast_data *)PyMem_Malloc(
sizeof(_strided_datetime_cast_data));
if (newdata == NULL) {
return NULL;
}
memcpy(newdata, data, sizeof(_strided_datetime_cast_data));
if (newdata->tmp_buffer != NULL) {
newdata->tmp_buffer = PyMem_Malloc(newdata->src_itemsize + 1);
if (newdata->tmp_buffer == NULL) {
PyMem_Free(newdata);
return NULL;
}
}
return (NpyAuxData *)newdata;
}
static int
_strided_to_strided_datetime_general_cast(
PyArrayMethod_Context *NPY_UNUSED(context), char * const*args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)auxdata;
npy_int64 dt;
npy_datetimestruct dts;
while (N > 0) {
memcpy(&dt, src, sizeof(dt));
if (convert_datetime_to_datetimestruct(&d->src_meta,
dt, &dts) < 0) {
return -1;
}
else {
if (convert_datetimestruct_to_datetime(&d->dst_meta,
&dts, &dt) < 0) {
return -1;
}
}
memcpy(dst, &dt, sizeof(dt));
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
static int
_strided_to_strided_datetime_cast(
PyArrayMethod_Context *NPY_UNUSED(context), char * const*args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)auxdata;
npy_int64 num = d->num, denom = d->denom;
npy_int64 dt;
while (N > 0) {
memcpy(&dt, src, sizeof(dt));
if (dt != NPY_DATETIME_NAT) {
/* Apply the scaling */
if (dt < 0) {
dt = (dt * num - (denom - 1)) / denom;
}
else {
dt = dt * num / denom;
}
}
memcpy(dst, &dt, sizeof(dt));
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
static int
_aligned_strided_to_strided_datetime_cast(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)auxdata;
npy_int64 num = d->num, denom = d->denom;
npy_int64 dt;
while (N > 0) {
dt = *(npy_int64 *)src;
if (dt != NPY_DATETIME_NAT) {
/* Apply the scaling */
if (dt < 0) {
dt = (dt * num - (denom - 1)) / denom;
}
else {
dt = dt * num / denom;
}
}
*(npy_int64 *)dst = dt;
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
static int
_strided_to_strided_datetime_to_string(
PyArrayMethod_Context *NPY_UNUSED(context), char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_stride = strides[0], dst_stride = strides[1];
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)auxdata;
npy_intp dst_itemsize = d->dst_itemsize;
npy_int64 dt;
npy_datetimestruct dts;
while (N > 0) {
memcpy(&dt, src, sizeof(dt));
if (convert_datetime_to_datetimestruct(&d->src_meta,
dt, &dts) < 0) {
return -1;
}
/* Initialize the destination to all zeros */
memset(dst, 0, dst_itemsize);
if (make_iso_8601_datetime(&dts, dst, dst_itemsize,
0, 0, d->src_meta.base, -1,
NPY_UNSAFE_CASTING) < 0) {
return -1;
}
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
static int
_strided_to_strided_string_to_datetime(
PyArrayMethod_Context *context, char *const *args,
const npy_intp *dimensions, const npy_intp *strides,
NpyAuxData *auxdata)
{
npy_intp N = dimensions[0];
char *src = args[0], *dst = args[1];
npy_intp src_itemsize = context->descriptors[0]->elsize;
npy_intp src_stride = strides[0], dst_stride = strides[1];
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)auxdata;
npy_datetimestruct dts;
char *tmp_buffer = d->tmp_buffer;
char *tmp;
while (N > 0) {
npy_int64 dt = ~NPY_DATETIME_NAT;
/* Replicating strnlen with memchr, because Mac OS X lacks it */
tmp = memchr(src, '\0', src_itemsize);
/* If the string is all full, use the buffer */
if (tmp == NULL) {
memcpy(tmp_buffer, src, src_itemsize);
tmp_buffer[src_itemsize] = '\0';
if (parse_iso_8601_datetime(tmp_buffer, src_itemsize,
d->dst_meta.base, NPY_SAME_KIND_CASTING,
&dts, NULL, NULL) < 0) {
return -1;
}
}
/* Otherwise parse the data in place */
else {
if (parse_iso_8601_datetime(src, tmp - src,
d->dst_meta.base, NPY_SAME_KIND_CASTING,
&dts, NULL, NULL) < 0) {
return -1;
}
}
/* Convert to the datetime */
if (dt != NPY_DATETIME_NAT &&
convert_datetimestruct_to_datetime(&d->dst_meta,
&dts, &dt) < 0) {
return -1;
}
memcpy(dst, &dt, sizeof(dt));
dst += dst_stride;
src += src_stride;
--N;
}
return 0;
}
/*
* Assumes src_dtype and dst_dtype are both datetimes or both timedeltas
*/
NPY_NO_EXPORT int
get_nbo_cast_datetime_transfer_function(int aligned,
PyArray_Descr *src_dtype, PyArray_Descr *dst_dtype,
PyArrayMethod_StridedLoop **out_stransfer,
NpyAuxData **out_transferdata)
{
PyArray_DatetimeMetaData *src_meta, *dst_meta;
npy_int64 num = 0, denom = 0;
_strided_datetime_cast_data *data;
src_meta = get_datetime_metadata_from_dtype(src_dtype);
if (src_meta == NULL) {