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