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array.c
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array.c
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/** @file array.h
** @brief Array
** @author Andrea Vedaldi
**/
#include "array.h"
#include <string.h>
/** @brief Get number of elements in array
** @param self array.
** @return number of elements.
**/
VL_EXPORT vl_size
vl_array_get_num_elements (VlArray const * self)
{
vl_size numElements = 1 ;
vl_uindex k ;
if (self->numDimensions == 0) {
return 0 ;
}
for (k = 0 ; k < self->numDimensions ; ++k) {
numElements *= self->dimensions[k] ;
}
return numElements ;
}
/* ---------------------------------------------------------------- */
/* init & dealloc */
/* ---------------------------------------------------------------- */
/** @brief New numeric array
** @param self array to initialize.
** @param type data type.
** @param numDimensions number of dimensions.
** @param dimensions dimensions.
**
** The function initializes the specified array and allocates
** the necessary memory for storage.
**/
VL_EXPORT VlArray *
vl_array_init (VlArray* self, vl_type type,
vl_size numDimensions, vl_size const * dimensions)
{
assert (numDimensions <= VL_ARRAY_MAX_NUM_DIMENSIONS) ;
self->type = type ;
self->numDimensions = numDimensions ;
memcpy(self->dimensions, dimensions, sizeof(vl_size) * numDimensions) ;
self->data = vl_malloc(vl_get_type_size(type) * vl_array_get_num_elements (self)) ;
self->isEnvelope = VL_FALSE ;
self->isSparse = VL_FALSE ;
return self ;
}
/** @brief New numeric array envelope
** @param self array to initialize.
** @param data data to envelople.
** @param type data type.
** @param numDimensions number of dimensions.
** @param dimensions dimensions.
**
** The function initializes the specified array wrapping the
** specified buffer.
**/
VL_EXPORT VlArray *
vl_array_init_envelope (VlArray * self, void * data, vl_type type,
vl_size numDimensions, vl_size const * dimensions)
{
assert (numDimensions <= VL_ARRAY_MAX_NUM_DIMENSIONS) ;
self->type = type ;
self->numDimensions = numDimensions ;
memcpy(self->dimensions, dimensions, sizeof(vl_size) * numDimensions) ;
self->data = data ;
self->isEnvelope = VL_TRUE ;
self->isSparse = VL_FALSE ;
return self ;
}
/** @brief New numeric array with matrix shape
** @param self array to initialize.
** @param type type.
** @param numRows number of rows.
** @param numColumns number of columns.
**/
VL_EXPORT VlArray *
vl_array_init_matrix (VlArray * self, vl_type type, vl_size numRows, vl_size numColumns)
{
vl_size dimensions [2] = {numRows, numColumns} ;
return vl_array_init (self, type, 2, dimensions) ;
}
/** @brief New numeric array envelpe with matrix shape
** @param self array to initialize.
** @param data data to envelope.
** @param type type.
** @param numRows number of rows.
** @param numColumns number of columns.
**/
VL_EXPORT VlArray *
vl_array_init_matrix_envelope (VlArray * self, void * data,
vl_type type, vl_size numRows, vl_size numColumns)
{
vl_size dimensions [2] = {numRows, numColumns} ;
return vl_array_init_envelope (self, data, type, 2, dimensions) ;
}
/** @brief Delete array
** @param self array.
**/
VL_EXPORT void
vl_array_dealloc (VlArray * self)
{
if (! self->isEnvelope) {
if (self->data) {
vl_free(self->data) ;
self->data = NULL ;
}
}
}
/* ---------------------------------------------------------------- */
/* new & delete */
/* ---------------------------------------------------------------- */
/** @brief New numeric array
** @param type data type.
** @param numDimensions number of dimensions.
** @param dimensions dimensions.
**
** The function creates a new VLArray instance and allocates
** the necessary memory for storage.
**/
VL_EXPORT VlArray *
vl_array_new (vl_type type, vl_size numDimensions, vl_size const * dimensions)
{
VlArray * self = vl_malloc(sizeof(VlArray)) ;
return vl_array_init(self, type, numDimensions, dimensions) ;
}
/** @brief New numeric array with matrix shape
** @param type type.
** @param numRows number of rows.
** @param numColumns number of columns.
**/
VL_EXPORT VlArray *
vl_array_new_matrix (vl_type type, vl_size numRows, vl_size numColumns)
{
vl_size dimensions [2] = {numRows, numColumns} ;
return vl_array_new (type, 2, dimensions) ;
}
/** @brief New numeric array envelope
** @param data data to envelople.
** @param type data type.
** @param numDimensions number of dimensions.
** @param dimensions dimensions.
**/
VL_EXPORT VlArray *
vl_array_new_envelope (void * data, vl_type type,
vl_size numDimensions, vl_size const * dimensions)
{
VlArray * self = vl_malloc(sizeof(VlArray)) ;
return vl_array_init_envelope(self, data, type, numDimensions, dimensions) ;
}
/** @brief New numeric array envelpe with matrix shape
** @param data data to envelope.
** @param type type.
** @param numRows number of rows.
** @param numColumns number of columns.
**/
VL_EXPORT VlArray *
vl_array_new_matrix_envelope (void * data, vl_type type, vl_size numRows, vl_size numColumns)
{
vl_size dimensions [2] = {numRows, numColumns} ;
return vl_array_new_envelope (data, type, 2, dimensions) ;
}
/** @brief Delete array
** @param self array.
**/
VL_EXPORT void
vl_array_delete (VlArray * self)
{
vl_array_dealloc(self) ;
vl_free(self) ;
}