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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 PY_SSIZE_T_CLEAN
#include "Python.h"
#include "structmember.h"
#define NPY_NO_DEPRECATED_API NPY_API_VERSION
#define _MULTIARRAYMODULE
#include <numpy/arrayobject.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 "lowlevel_strided_loops.h"
#include "alloc.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_decsrcref_transfer_function(int aligned,
npy_intp src_stride,
PyArray_Descr *src_dtype,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata,
int *out_needs_api);
/*
* Returns a transfer function which zeros out the dest values.
*
* Returns NPY_SUCCEED or NPY_FAIL.
*/
static int
get_setdstzero_transfer_function(int aligned,
npy_intp dst_stride,
PyArray_Descr *dst_dtype,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata,
int *out_needs_api);
/*
* Returns a transfer function which sets a boolean type to ones.
*
* Returns NPY_SUCCEED or NPY_FAIL.
*/
NPY_NO_EXPORT int
get_bool_setdstone_transfer_function(npy_intp dst_stride,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata,
int *NPY_UNUSED(out_needs_api));
/*************************** COPY REFERENCES *******************************/
/* Moves references from src to dst */
static int
_strided_to_strided_move_references(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
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 */
static int
_strided_to_strided_copy_references(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
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;
}
/************************** ZERO-PADDED COPY ******************************/
/* Does a zero-padded copy */
typedef struct {
NpyAuxData base;
npy_intp dst_itemsize;
} _strided_zero_pad_data;
/* zero-padded data copy function */
static NpyAuxData *_strided_zero_pad_data_clone(NpyAuxData *data)
{
_strided_zero_pad_data *newdata =
(_strided_zero_pad_data *)PyArray_malloc(
sizeof(_strided_zero_pad_data));
if (newdata == NULL) {
return NULL;
}
memcpy(newdata, data, sizeof(_strided_zero_pad_data));
return (NpyAuxData *)newdata;
}
/*
* Does a strided to strided zero-padded copy for the case where
* dst_itemsize > src_itemsize
*/
static int
_strided_to_strided_zero_pad_copy(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_zero_pad_data *d = (_strided_zero_pad_data *)data;
npy_intp dst_itemsize = d->dst_itemsize;
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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_zero_pad_data *d = (_strided_zero_pad_data *)data;
npy_intp dst_itemsize = d->dst_itemsize;
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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_zero_pad_data *d = (_strided_zero_pad_data *)data;
npy_intp dst_itemsize = d->dst_itemsize;
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,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata)
{
if ((src_itemsize == dst_itemsize) && !unicode_swap) {
*out_stransfer = PyArray_GetStridedCopyFn(aligned, src_stride,
dst_stride, src_itemsize);
*out_transferdata = NULL;
return (*out_stransfer == NULL) ? NPY_FAIL : NPY_SUCCEED;
}
else {
_strided_zero_pad_data *d = PyArray_malloc(
sizeof(_strided_zero_pad_data));
if (d == NULL) {
PyErr_NoMemory();
return NPY_FAIL;
}
d->dst_itemsize = dst_itemsize;
d->base.free = (NpyAuxData_FreeFunc *)&PyArray_free;
d->base.clone = &_strided_zero_pad_data_clone;
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;
}
*out_transferdata = (NpyAuxData *)d;
return NPY_SUCCEED;
}
}
/***************** WRAP ALIGNED CONTIGUOUS TRANSFER FUNCTION **************/
/* Wraps a transfer function + data in alignment code */
typedef struct {
NpyAuxData base;
PyArray_StridedUnaryOp *wrapped,
*tobuffer, *frombuffer;
NpyAuxData *wrappeddata, *todata, *fromdata;
npy_intp src_itemsize, dst_itemsize;
char *bufferin, *bufferout;
npy_bool init_dest, out_needs_api;
} _align_wrap_data;
/* transfer data free function */
static void _align_wrap_data_free(NpyAuxData *data)
{
_align_wrap_data *d = (_align_wrap_data *)data;
NPY_AUXDATA_FREE(d->wrappeddata);
NPY_AUXDATA_FREE(d->todata);
NPY_AUXDATA_FREE(d->fromdata);
PyArray_free(data);
}
/* transfer data copy function */
static NpyAuxData *_align_wrap_data_clone(NpyAuxData *data)
{
_align_wrap_data *d = (_align_wrap_data *)data;
_align_wrap_data *newdata;
npy_intp basedatasize, datasize;
/* Round up the structure size to 16-byte boundary */
basedatasize = (sizeof(_align_wrap_data)+15)&(-0x10);
/* Add space for two low level buffers */
datasize = basedatasize +
NPY_LOWLEVEL_BUFFER_BLOCKSIZE*d->src_itemsize +
NPY_LOWLEVEL_BUFFER_BLOCKSIZE*d->dst_itemsize;
/* Allocate the data, and populate it */
newdata = (_align_wrap_data *)PyArray_malloc(datasize);
if (newdata == NULL) {
return NULL;
}
memcpy(newdata, data, basedatasize);
newdata->bufferin = (char *)newdata + basedatasize;
newdata->bufferout = newdata->bufferin +
NPY_LOWLEVEL_BUFFER_BLOCKSIZE*newdata->src_itemsize;
if (newdata->wrappeddata != NULL) {
newdata->wrappeddata = NPY_AUXDATA_CLONE(d->wrappeddata);
if (newdata->wrappeddata == NULL) {
PyArray_free(newdata);
return NULL;
}
}
if (newdata->todata != NULL) {
newdata->todata = NPY_AUXDATA_CLONE(d->todata);
if (newdata->todata == NULL) {
NPY_AUXDATA_FREE(newdata->wrappeddata);
PyArray_free(newdata);
return NULL;
}
}
if (newdata->fromdata != NULL) {
newdata->fromdata = NPY_AUXDATA_CLONE(d->fromdata);
if (newdata->fromdata == NULL) {
NPY_AUXDATA_FREE(newdata->wrappeddata);
NPY_AUXDATA_FREE(newdata->todata);
PyArray_free(newdata);
return NULL;
}
}
newdata->init_dest = d->init_dest;
newdata->out_needs_api = d->out_needs_api;
return (NpyAuxData *)newdata;
}
static int
_strided_to_strided_contig_align_wrap(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_align_wrap_data *d = (_align_wrap_data *)data;
PyArray_StridedUnaryOp *wrapped = d->wrapped,
*tobuffer = d->tobuffer,
*frombuffer = d->frombuffer;
npy_intp inner_src_itemsize = d->src_itemsize,
dst_itemsize = d->dst_itemsize;
NpyAuxData *wrappeddata = d->wrappeddata,
*todata = d->todata,
*fromdata = d->fromdata;
char *bufferin = d->bufferin, *bufferout = d->bufferout;
npy_bool init_dest = d->init_dest;
for(;;) {
if (N > NPY_LOWLEVEL_BUFFER_BLOCKSIZE) {
if (tobuffer(
bufferin, inner_src_itemsize, src, src_stride,
NPY_LOWLEVEL_BUFFER_BLOCKSIZE, src_itemsize, todata) < 0) {
return -1;
}
if (init_dest) {
memset(bufferout, 0,
dst_itemsize*NPY_LOWLEVEL_BUFFER_BLOCKSIZE);
}
if (wrapped(bufferout, dst_itemsize, bufferin, inner_src_itemsize,
NPY_LOWLEVEL_BUFFER_BLOCKSIZE,
inner_src_itemsize, wrappeddata) < 0) {
return -1;
}
if (frombuffer(dst, dst_stride, bufferout, dst_itemsize,
NPY_LOWLEVEL_BUFFER_BLOCKSIZE,
dst_itemsize, fromdata) < 0) {
return -1;
}
N -= NPY_LOWLEVEL_BUFFER_BLOCKSIZE;
src += NPY_LOWLEVEL_BUFFER_BLOCKSIZE*src_stride;
dst += NPY_LOWLEVEL_BUFFER_BLOCKSIZE*dst_stride;
}
else {
if (tobuffer(bufferin, inner_src_itemsize, src, src_stride,
N, src_itemsize, todata) < 0) {
return -1;
}
if (init_dest) {
memset(bufferout, 0, dst_itemsize*N);
}
if (wrapped(bufferout, dst_itemsize, bufferin, inner_src_itemsize,
N, inner_src_itemsize, wrappeddata) < 0) {
return -1;
}
if (frombuffer(dst, dst_stride, bufferout, dst_itemsize,
N, dst_itemsize, fromdata) < 0) {
return -1;
}
return 0;
}
}
}
/*
* Wraps an aligned contig to contig transfer function between either
* copies or byte swaps to temporary buffers.
*
* src_itemsize/dst_itemsize - The sizes of the src and dst datatypes.
* tobuffer - copy/swap function from src to an aligned contiguous buffer.
* todata - data for tobuffer
* frombuffer - copy/swap function from an aligned contiguous buffer to dst.
* fromdata - data for frombuffer
* wrapped - contig to contig transfer function being wrapped
* wrappeddata - data for wrapped
* init_dest - 1 means to memset the dest buffer to 0 before calling wrapped.
* out_needs_api - if NPY_TRUE, check for (and break on) Python API errors.
*
* Returns NPY_SUCCEED or NPY_FAIL.
*/
NPY_NO_EXPORT int
wrap_aligned_contig_transfer_function(
npy_intp src_itemsize, npy_intp dst_itemsize,
PyArray_StridedUnaryOp *tobuffer, NpyAuxData *todata,
PyArray_StridedUnaryOp *frombuffer, NpyAuxData *fromdata,
PyArray_StridedUnaryOp *wrapped, NpyAuxData *wrappeddata,
int init_dest,
int out_needs_api,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata)
{
_align_wrap_data *data;
npy_intp basedatasize, datasize;
/* Round up the structure size to 16-byte boundary */
basedatasize = (sizeof(_align_wrap_data)+15)&(-0x10);
/* Add space for two low level buffers */
datasize = basedatasize +
NPY_LOWLEVEL_BUFFER_BLOCKSIZE*src_itemsize +
NPY_LOWLEVEL_BUFFER_BLOCKSIZE*dst_itemsize;
/* Allocate the data, and populate it */
data = (_align_wrap_data *)PyArray_malloc(datasize);
if (data == NULL) {
PyErr_NoMemory();
return NPY_FAIL;
}
data->base.free = &_align_wrap_data_free;
data->base.clone = &_align_wrap_data_clone;
data->tobuffer = tobuffer;
data->todata = todata;
data->frombuffer = frombuffer;
data->fromdata = fromdata;
data->wrapped = wrapped;
data->wrappeddata = wrappeddata;
data->src_itemsize = src_itemsize;
data->dst_itemsize = dst_itemsize;
data->bufferin = (char *)data + basedatasize;
data->bufferout = data->bufferin +
NPY_LOWLEVEL_BUFFER_BLOCKSIZE*src_itemsize;
data->init_dest = (npy_bool) init_dest;
data->out_needs_api = (npy_bool) out_needs_api;
/* Set the function and data */
*out_stransfer = &_strided_to_strided_contig_align_wrap;
*out_transferdata = (NpyAuxData *)data;
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);
PyArray_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 *)PyArray_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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp NPY_UNUSED(src_itemsize),
NpyAuxData *data)
{
_wrap_copy_swap_data *d = (_wrap_copy_swap_data *)data;
/* 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 only gets used for custom data types and for Unicode when swapping */
static int
wrap_copy_swap_function(int aligned,
npy_intp src_stride, npy_intp dst_stride,
PyArray_Descr *dtype,
int should_swap,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata)
{
_wrap_copy_swap_data *data;
npy_intp shape = 1;
/* Allocate the data for the copy swap */
data = (_wrap_copy_swap_data *)PyArray_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);
data->arr = (PyArrayObject *)PyArray_NewFromDescr_int(
&PyArray_Type, dtype,
1, &shape, NULL, NULL,
0, NULL, NULL,
0, 1);
if (data->arr == NULL) {
PyArray_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);
PyArray_free(data);
}
/* strided cast data copy function */
static NpyAuxData *_strided_cast_data_clone(NpyAuxData *data)
{
_strided_cast_data *newdata =
(_strided_cast_data *)PyArray_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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_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;
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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_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(char *dst, npy_intp NPY_UNUSED(dst_stride),
char *src, npy_intp NPY_UNUSED(src_stride),
npy_intp N, npy_intp NPY_UNUSED(itemsize),
NpyAuxData *data)
{
_strided_cast_data *d = (_strided_cast_data *)data;
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;
}
static int
get_nbo_cast_numeric_transfer_function(int aligned,
npy_intp src_stride, npy_intp dst_stride,
int src_type_num, int dst_type_num,
PyArray_StridedUnaryOp **out_stransfer,
NpyAuxData **out_transferdata)
{
/* Emit a warning if complex imaginary is being cast away */
if (PyTypeNum_ISCOMPLEX(src_type_num) &&
!PyTypeNum_ISCOMPLEX(dst_type_num) &&
!PyTypeNum_ISBOOL(dst_type_num)) {
static PyObject *cls = NULL;
int ret;
npy_cache_import("numpy.core", "ComplexWarning", &cls);
if (cls == NULL) {
return NPY_FAIL;
}
ret = PyErr_WarnEx(cls,
"Casting complex values to real discards "
"the imaginary part", 1);
if (ret < 0) {
return NPY_FAIL;
}
}
*out_stransfer = PyArray_GetStridedNumericCastFn(aligned,
src_stride, dst_stride,
src_type_num, dst_type_num);
*out_transferdata = NULL;
if (*out_stransfer == NULL) {
PyErr_SetString(PyExc_ValueError,
"unexpected error in GetStridedNumericCastFn");
return NPY_FAIL;
}
return NPY_SUCCEED;
}
/*
* 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;
PyArray_free(d->tmp_buffer);
PyArray_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 *)PyArray_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 = PyArray_malloc(newdata->src_itemsize + 1);
if (newdata->tmp_buffer == NULL) {
PyArray_free(newdata);
return NULL;
}
}
return (NpyAuxData *)newdata;
}
static int
_strided_to_strided_datetime_general_cast(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)data;
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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)data;
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(char *dst,
npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)data;
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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp NPY_UNUSED(src_itemsize),
NpyAuxData *data)
{
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)data;
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(char *dst, npy_intp dst_stride,
char *src, npy_intp src_stride,
npy_intp N, npy_intp src_itemsize,
NpyAuxData *data)
{
_strided_datetime_cast_data *d = (_strided_datetime_cast_data *)data;
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;