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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';
// MAIN //
/**
* Computes the maximum linear index in an underlying data buffer accessible to an array view.
*
* @param {NonNegativeIntegerArray} shape - array shape
* @param {IntegerArray} strides - stride array
* @param {NonNegativeInteger} offset - index offset
* @returns {NonNegativeInteger} linear index
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ 10, 1 ];
* var offset = 0;
*
* var idx = maxViewBufferIndex( shape, strides, offset );
* // returns 99
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ -10, -1 ];
* var offset = 99;
*
* var idx = maxViewBufferIndex( shape, strides, offset );
* // returns 99
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ 1, 10 ];
* var offset = 0;
*
* var idx = maxViewBufferIndex( shape, strides, offset );
* // returns 99
*
* @example
* var shape = [ 10, 10 ];
* var strides = [ -1, -10 ];
* var offset = 99;
*
* var idx = maxViewBufferIndex( shape, strides, offset );
* // returns 99
*/
function maxViewBufferIndex( shape, strides, offset ) {
var ndims;
var idx;
var i;
ndims = shape.length;
idx = offset;
for ( i = 0; i < ndims; i++ ) {
if ( shape[ i ] === 0 ) {
return offset;
}
if ( strides[ i ] > 0 ) {
idx += strides[ i ] * ( shape[ i ] - 1 );
}
}
return idx;
}
// EXPORTS //
module.exports = maxViewBufferIndex;
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