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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var resolveStr = require( '@stdlib/ndarray/base/dtype-resolve-str' );
var bufferCtors = require( '@stdlib/ndarray/base/buffer-ctors' );
var allocUnsafe = require( '@stdlib/buffer/alloc-unsafe' );
var zeros = require( '@stdlib/array/base/zeros' );
var fill = require( '@stdlib/array/base/fill' );
// FUNCTIONS //
/**
* Returns a zero-filled binary buffer.
*
* @private
* @param {NonNegativeInteger} size - buffer size
* @returns {Buffer} zero-filled binary buffer
*/
function binary( size ) {
return fill( allocUnsafe( size ), 0, 0, size );
}
/**
* Returns a typed array.
*
* @private
* @param {*} dtype - data type
* @param {NonNegativeInteger} size - buffer size
* @returns {(TypedArray|null)} typed array
*/
function typedarray( dtype, size ) {
var ctor = bufferCtors( dtype );
if ( ctor ) {
return new ctor( size );
}
return null;
}
// MAIN //
/**
* Returns a contiguous linear ndarray data buffer.
*
* @param {*} dtype - data type
* @param {NonNegativeInteger} size - buffer size
* @returns {(Array|TypedArray|Buffer|null)} data buffer
*
* @example
* var buf = buffer( 'float64', 3 );
* // returns <Float64Array>[ 0.0, 0.0, 0.0 ]
*/
function buffer( dtype, size ) {
var dt = resolveStr( dtype );
if ( dt === 'generic' ) {
return zeros( size );
}
if ( dt === 'binary' ) {
return binary( size );
}
return typedarray( dtype, size );
}
// EXPORTS //
module.exports = buffer;
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