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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 isEqualDataType = require( '@stdlib/ndarray/base/assert/is-equal-data-type' );
var bufferCtors = require( '@stdlib/ndarray/base/buffer-ctors' );
var allocUnsafe = require( '@stdlib/buffer/alloc-unsafe' );
var resolveGetter = require( '@stdlib/array/base/resolve-getter' );
var resolveSetter = require( '@stdlib/array/base/resolve-setter' );
// MAIN //
/**
* Casts buffer elements by copying those elements to a buffer of another data type.
*
* @private
* @param {(Array|TypedArray|Buffer)} buffer - input buffer
* @param {NonNegativeInteger} len - number of elements to cast
* @param {*} dtype - data type
* @returns {(Array|TypedArray|Buffer)} output buffer
*
* @example
* var b = castBuffer( [ 1.0, 2.0, 3.0 ], 3, 'float64' );
* // returns <Float64Array>[ 1.0, 2.0, 3.0 ]
*/
function castBuffer( buffer, len, dtype ) {
var bget;
var oset;
var ctor;
var out;
var i;
bget = resolveGetter( buffer );
if ( isEqualDataType( dtype, 'generic' ) ) {
out = [];
for ( i = 0; i < len; i++ ) {
out.push( bget( buffer, i ) );
}
return out;
}
if ( isEqualDataType( dtype, 'binary' ) ) {
out = allocUnsafe( len );
for ( i = 0; i < len; i++ ) {
out[ i ] = bget( buffer, i );
}
return out;
}
ctor = bufferCtors( dtype );
out = new ctor( len );
oset = resolveSetter( out );
for ( i = 0; i < len; i++ ) {
oset( out, i, bget( buffer, i ) );
}
return out;
}
// EXPORTS //
module.exports = castBuffer;
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