aureooms-js-integer/lib/1-new/arithmetic/sub/_sub.js

integer code bricks for JavaScript

"use strict";

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports._sub = _sub;

/**
 * Subtracts two big endian arrays, k >= i >= j
 * wraps
 *
 * @param {int} r base (radix)
 * @param {array} a first operand
 * @param {int} ai a left
 * @param {int} aj a right
 * @param {array} b second operand
 * @param {int} bi b left
 * @param {int} bj b right
 * @param {array} c result, must be 0 initialized
 * @param {int} ci c left
 * @param {int} cj c right
 */

function _sub(r, a, ai, aj, b, bi, bj, c, ci, cj) {
	var T,
	    C = 0;

	while (--bj >= bi) {
		--aj;--cj;
		T = C;
		C = a[aj] < b[bj] + T;
		c[cj] = a[aj] - b[bj] + (C * r - T);
	}

	while (--aj >= ai) {
		--cj;
		T = C;
		C = a[aj] < T;
		c[cj] = a[aj] + (C * r - T);
	}

	if (C) {
		while (--cj >= ci) {
			c[cj] = r - 1;
		}
	}
}
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