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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 pow = require( '@stdlib/math/base/special/pow' );
var format = require( '@stdlib/string/format' );
var toUint32 = require( '@stdlib/number/float64/base/to-uint32' );
// VARIABLES //
var NBITS = 32;
// MAIN //
/**
* Creates an unsigned 32-bit integer from a literal bit representation.
*
* @param {BinaryString} bstr - string which is a literal bit representation
* @throws {Error} must provide a string with a length equal to `32`
* @returns {uinteger32} unsigned 32-bit integer
*
* @example
* var bstr = '01010101010101010101010101010101';
* var val = fromBinaryStringUint32( bstr );
* // returns 1431655765
*
* @example
* var bstr = '00000000000000000000000000000000';
* var val = fromBinaryStringUint32( bstr );
* // returns 0
*
* @example
* var bstr = '00000000000000000000000000000010';
* var val = fromBinaryStringUint32( bstr );
* // returns 2
*
* @example
* var bstr = '11111111111111111111111111111111';
* var val = fromBinaryStringUint32( bstr );
* // returns 4294967295
*/
function fromBinaryStringUint32( bstr ) {
var sum;
var i;
if ( bstr.length !== NBITS ) {
throw new Error( format( 'invalid argument. Input string must have a length equal to %u. Value: `%s`.', NBITS, bstr ) );
}
sum = 0;
for ( i = 0; i < bstr.length; i++ ) {
if ( bstr[ i ] === '1' ) {
sum += pow( 2, (NBITS-i-1) );
}
}
return toUint32( sum );
}
// EXPORTS //
module.exports = fromBinaryStringUint32;
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