844 lines
24 KiB
JavaScript
844 lines
24 KiB
JavaScript
// Copyright 2009 The Closure Library Authors. All Rights Reserved.
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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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* @fileoverview Defines a Long class for representing a 64-bit two's-complement
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* integer value, which faithfully simulates the behavior of a Java "long". This
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* implementation is derived from LongLib in GWT.
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*
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*/
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goog.provide('goog.math.Long');
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goog.require('goog.reflect');
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/**
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* Constructs a 64-bit two's-complement integer, given its low and high 32-bit
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* values as *signed* integers. See the from* functions below for more
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* convenient ways of constructing Longs.
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*
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* The internal representation of a long is the two given signed, 32-bit values.
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* We use 32-bit pieces because these are the size of integers on which
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* Javascript performs bit-operations. For operations like addition and
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* multiplication, we split each number into 16-bit pieces, which can easily be
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* multiplied within Javascript's floating-point representation without overflow
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* or change in sign.
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*
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* In the algorithms below, we frequently reduce the negative case to the
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* positive case by negating the input(s) and then post-processing the result.
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* Note that we must ALWAYS check specially whether those values are MIN_VALUE
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* (-2^63) because -MIN_VALUE == MIN_VALUE (since 2^63 cannot be represented as
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* a positive number, it overflows back into a negative). Not handling this
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* case would often result in infinite recursion.
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*
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* @param {number} low The low (signed) 32 bits of the long.
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* @param {number} high The high (signed) 32 bits of the long.
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* @struct
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* @constructor
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* @final
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*/
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goog.math.Long = function(low, high) {
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/**
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* @type {number}
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* @private
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*/
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this.low_ = low | 0; // force into 32 signed bits.
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/**
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* @type {number}
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* @private
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*/
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this.high_ = high | 0; // force into 32 signed bits.
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};
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// NOTE: Common constant values ZERO, ONE, NEG_ONE, etc. are defined below the
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// from* methods on which they depend.
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/**
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* A cache of the Long representations of small integer values.
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* @type {!Object<number, !goog.math.Long>}
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* @private
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*/
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goog.math.Long.IntCache_ = {};
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/**
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* A cache of the Long representations of common values.
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* @type {!Object<goog.math.Long.ValueCacheId_, !goog.math.Long>}
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* @private
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*/
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goog.math.Long.valueCache_ = {};
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/**
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* Returns a Long representing the given (32-bit) integer value.
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* @param {number} value The 32-bit integer in question.
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* @return {!goog.math.Long} The corresponding Long value.
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*/
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goog.math.Long.fromInt = function(value) {
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if (-128 <= value && value < 128) {
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return goog.reflect.cache(goog.math.Long.IntCache_, value, function(val) {
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return new goog.math.Long(val | 0, val < 0 ? -1 : 0);
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});
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} else {
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return new goog.math.Long(value | 0, value < 0 ? -1 : 0);
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}
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};
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/**
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* Returns a Long representing the given value.
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* NaN will be returned as zero. Infinity is converted to max value and
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* -Infinity to min value.
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* @param {number} value The number in question.
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* @return {!goog.math.Long} The corresponding Long value.
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*/
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goog.math.Long.fromNumber = function(value) {
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if (isNaN(value)) {
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return goog.math.Long.getZero();
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} else if (value <= -goog.math.Long.TWO_PWR_63_DBL_) {
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return goog.math.Long.getMinValue();
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} else if (value + 1 >= goog.math.Long.TWO_PWR_63_DBL_) {
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return goog.math.Long.getMaxValue();
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} else if (value < 0) {
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return goog.math.Long.fromNumber(-value).negate();
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} else {
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return new goog.math.Long(
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(value % goog.math.Long.TWO_PWR_32_DBL_) | 0,
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(value / goog.math.Long.TWO_PWR_32_DBL_) | 0);
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}
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};
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/**
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* Returns a Long representing the 64-bit integer that comes by concatenating
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* the given high and low bits. Each is assumed to use 32 bits.
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* @param {number} lowBits The low 32-bits.
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* @param {number} highBits The high 32-bits.
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* @return {!goog.math.Long} The corresponding Long value.
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*/
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goog.math.Long.fromBits = function(lowBits, highBits) {
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return new goog.math.Long(lowBits, highBits);
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};
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/**
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* Returns a Long representation of the given string, written using the given
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* radix.
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* @param {string} str The textual representation of the Long.
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* @param {number=} opt_radix The radix in which the text is written.
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* @return {!goog.math.Long} The corresponding Long value.
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*/
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goog.math.Long.fromString = function(str, opt_radix) {
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if (str.length == 0) {
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throw Error('number format error: empty string');
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}
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var radix = opt_radix || 10;
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if (radix < 2 || 36 < radix) {
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throw Error('radix out of range: ' + radix);
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}
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if (str.charAt(0) == '-') {
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return goog.math.Long.fromString(str.substring(1), radix).negate();
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} else if (str.indexOf('-') >= 0) {
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throw Error('number format error: interior "-" character: ' + str);
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}
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// Do several (8) digits each time through the loop, so as to
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// minimize the calls to the very expensive emulated div.
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var radixToPower = goog.math.Long.fromNumber(Math.pow(radix, 8));
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var result = goog.math.Long.getZero();
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for (var i = 0; i < str.length; i += 8) {
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var size = Math.min(8, str.length - i);
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var value = parseInt(str.substring(i, i + size), radix);
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if (size < 8) {
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var power = goog.math.Long.fromNumber(Math.pow(radix, size));
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result = result.multiply(power).add(goog.math.Long.fromNumber(value));
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} else {
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result = result.multiply(radixToPower);
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result = result.add(goog.math.Long.fromNumber(value));
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}
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}
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return result;
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};
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// NOTE: the compiler should inline these constant values below and then remove
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// these variables, so there should be no runtime penalty for these.
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/**
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* Number used repeated below in calculations. This must appear before the
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* first call to any from* function below.
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* @type {number}
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* @private
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*/
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goog.math.Long.TWO_PWR_16_DBL_ = 1 << 16;
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/**
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* @type {number}
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* @private
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*/
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goog.math.Long.TWO_PWR_32_DBL_ =
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goog.math.Long.TWO_PWR_16_DBL_ * goog.math.Long.TWO_PWR_16_DBL_;
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/**
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* @type {number}
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* @private
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*/
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goog.math.Long.TWO_PWR_64_DBL_ =
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goog.math.Long.TWO_PWR_32_DBL_ * goog.math.Long.TWO_PWR_32_DBL_;
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/**
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* @type {number}
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* @private
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*/
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goog.math.Long.TWO_PWR_63_DBL_ = goog.math.Long.TWO_PWR_64_DBL_ / 2;
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/**
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* @return {!goog.math.Long}
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* @public
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*/
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goog.math.Long.getZero = function() {
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return goog.reflect.cache(
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goog.math.Long.valueCache_, goog.math.Long.ValueCacheId_.ZERO,
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function() { return goog.math.Long.fromInt(0); });
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};
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/**
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* @return {!goog.math.Long}
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* @public
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*/
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goog.math.Long.getOne = function() {
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return goog.reflect.cache(
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goog.math.Long.valueCache_, goog.math.Long.ValueCacheId_.ONE,
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function() { return goog.math.Long.fromInt(1); });
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};
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/**
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* @return {!goog.math.Long}
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* @public
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*/
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goog.math.Long.getNegOne = function() {
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return goog.reflect.cache(
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goog.math.Long.valueCache_, goog.math.Long.ValueCacheId_.NEG_ONE,
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function() { return goog.math.Long.fromInt(-1); });
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};
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/**
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* @return {!goog.math.Long}
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* @public
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*/
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goog.math.Long.getMaxValue = function() {
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return goog.reflect.cache(
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goog.math.Long.valueCache_, goog.math.Long.ValueCacheId_.MAX_VALUE,
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function() {
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return goog.math.Long.fromBits(0xFFFFFFFF | 0, 0x7FFFFFFF | 0);
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});
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};
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/**
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* @return {!goog.math.Long}
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* @public
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*/
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goog.math.Long.getMinValue = function() {
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return goog.reflect.cache(
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goog.math.Long.valueCache_, goog.math.Long.ValueCacheId_.MIN_VALUE,
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function() { return goog.math.Long.fromBits(0, 0x80000000 | 0); });
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};
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/**
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* @return {!goog.math.Long}
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* @public
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*/
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goog.math.Long.getTwoPwr24 = function() {
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return goog.reflect.cache(
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goog.math.Long.valueCache_, goog.math.Long.ValueCacheId_.TWO_PWR_24,
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function() { return goog.math.Long.fromInt(1 << 24); });
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};
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/** @return {number} The value, assuming it is a 32-bit integer. */
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goog.math.Long.prototype.toInt = function() {
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return this.low_;
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};
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/** @return {number} The closest floating-point representation to this value. */
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goog.math.Long.prototype.toNumber = function() {
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return this.high_ * goog.math.Long.TWO_PWR_32_DBL_ +
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this.getLowBitsUnsigned();
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};
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/**
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* @param {number=} opt_radix The radix in which the text should be written.
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* @return {string} The textual representation of this value.
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* @override
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*/
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goog.math.Long.prototype.toString = function(opt_radix) {
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var radix = opt_radix || 10;
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if (radix < 2 || 36 < radix) {
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throw Error('radix out of range: ' + radix);
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}
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if (this.isZero()) {
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return '0';
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}
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if (this.isNegative()) {
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if (this.equals(goog.math.Long.getMinValue())) {
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// We need to change the Long value before it can be negated, so we remove
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// the bottom-most digit in this base and then recurse to do the rest.
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var radixLong = goog.math.Long.fromNumber(radix);
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var div = this.div(radixLong);
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var rem = div.multiply(radixLong).subtract(this);
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return div.toString(radix) + rem.toInt().toString(radix);
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} else {
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return '-' + this.negate().toString(radix);
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}
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}
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// Do several (6) digits each time through the loop, so as to
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// minimize the calls to the very expensive emulated div.
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var radixToPower = goog.math.Long.fromNumber(Math.pow(radix, 6));
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var rem = this;
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var result = '';
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while (true) {
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var remDiv = rem.div(radixToPower);
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// The right shifting fixes negative values in the case when
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// intval >= 2^31; for more details see
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// https://github.com/google/closure-library/pull/498
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var intval = rem.subtract(remDiv.multiply(radixToPower)).toInt() >>> 0;
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var digits = intval.toString(radix);
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rem = remDiv;
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if (rem.isZero()) {
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return digits + result;
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} else {
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while (digits.length < 6) {
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digits = '0' + digits;
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}
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result = '' + digits + result;
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}
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}
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};
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/** @return {number} The high 32-bits as a signed value. */
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goog.math.Long.prototype.getHighBits = function() {
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return this.high_;
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};
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/** @return {number} The low 32-bits as a signed value. */
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goog.math.Long.prototype.getLowBits = function() {
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return this.low_;
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};
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/** @return {number} The low 32-bits as an unsigned value. */
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goog.math.Long.prototype.getLowBitsUnsigned = function() {
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return (this.low_ >= 0) ? this.low_ :
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goog.math.Long.TWO_PWR_32_DBL_ + this.low_;
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};
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/**
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* @return {number} Returns the number of bits needed to represent the absolute
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* value of this Long.
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*/
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goog.math.Long.prototype.getNumBitsAbs = function() {
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if (this.isNegative()) {
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if (this.equals(goog.math.Long.getMinValue())) {
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return 64;
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} else {
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return this.negate().getNumBitsAbs();
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}
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} else {
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var val = this.high_ != 0 ? this.high_ : this.low_;
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for (var bit = 31; bit > 0; bit--) {
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if ((val & (1 << bit)) != 0) {
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break;
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}
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}
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return this.high_ != 0 ? bit + 33 : bit + 1;
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}
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};
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/** @return {boolean} Whether this value is zero. */
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goog.math.Long.prototype.isZero = function() {
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return this.high_ == 0 && this.low_ == 0;
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};
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/** @return {boolean} Whether this value is negative. */
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goog.math.Long.prototype.isNegative = function() {
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return this.high_ < 0;
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};
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/** @return {boolean} Whether this value is odd. */
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goog.math.Long.prototype.isOdd = function() {
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return (this.low_ & 1) == 1;
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};
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/**
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* @param {goog.math.Long} other Long to compare against.
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* @return {boolean} Whether this Long equals the other.
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*/
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goog.math.Long.prototype.equals = function(other) {
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return (this.high_ == other.high_) && (this.low_ == other.low_);
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};
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/**
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* @param {goog.math.Long} other Long to compare against.
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* @return {boolean} Whether this Long does not equal the other.
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*/
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goog.math.Long.prototype.notEquals = function(other) {
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return (this.high_ != other.high_) || (this.low_ != other.low_);
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};
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/**
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* @param {goog.math.Long} other Long to compare against.
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* @return {boolean} Whether this Long is less than the other.
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*/
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goog.math.Long.prototype.lessThan = function(other) {
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return this.compare(other) < 0;
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};
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/**
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* @param {goog.math.Long} other Long to compare against.
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* @return {boolean} Whether this Long is less than or equal to the other.
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*/
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goog.math.Long.prototype.lessThanOrEqual = function(other) {
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return this.compare(other) <= 0;
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};
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/**
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* @param {goog.math.Long} other Long to compare against.
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* @return {boolean} Whether this Long is greater than the other.
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*/
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goog.math.Long.prototype.greaterThan = function(other) {
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return this.compare(other) > 0;
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};
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/**
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* @param {goog.math.Long} other Long to compare against.
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* @return {boolean} Whether this Long is greater than or equal to the other.
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*/
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goog.math.Long.prototype.greaterThanOrEqual = function(other) {
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return this.compare(other) >= 0;
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};
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/**
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* Compares this Long with the given one.
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* @param {goog.math.Long} other Long to compare against.
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* @return {number} 0 if they are the same, 1 if the this is greater, and -1
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* if the given one is greater.
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*/
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goog.math.Long.prototype.compare = function(other) {
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if (this.equals(other)) {
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return 0;
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}
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var thisNeg = this.isNegative();
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var otherNeg = other.isNegative();
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if (thisNeg && !otherNeg) {
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return -1;
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}
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if (!thisNeg && otherNeg) {
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return 1;
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}
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// at this point, the signs are the same, so subtraction will not overflow
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if (this.subtract(other).isNegative()) {
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return -1;
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} else {
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return 1;
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}
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};
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/** @return {!goog.math.Long} The negation of this value. */
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goog.math.Long.prototype.negate = function() {
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if (this.equals(goog.math.Long.getMinValue())) {
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return goog.math.Long.getMinValue();
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} else {
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return this.not().add(goog.math.Long.getOne());
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}
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};
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/**
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* Returns the sum of this and the given Long.
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* @param {goog.math.Long} other Long to add to this one.
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* @return {!goog.math.Long} The sum of this and the given Long.
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*/
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goog.math.Long.prototype.add = function(other) {
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// Divide each number into 4 chunks of 16 bits, and then sum the chunks.
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var a48 = this.high_ >>> 16;
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var a32 = this.high_ & 0xFFFF;
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var a16 = this.low_ >>> 16;
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var a00 = this.low_ & 0xFFFF;
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var b48 = other.high_ >>> 16;
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var b32 = other.high_ & 0xFFFF;
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var b16 = other.low_ >>> 16;
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var b00 = other.low_ & 0xFFFF;
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|
|
var c48 = 0, c32 = 0, c16 = 0, c00 = 0;
|
|
c00 += a00 + b00;
|
|
c16 += c00 >>> 16;
|
|
c00 &= 0xFFFF;
|
|
c16 += a16 + b16;
|
|
c32 += c16 >>> 16;
|
|
c16 &= 0xFFFF;
|
|
c32 += a32 + b32;
|
|
c48 += c32 >>> 16;
|
|
c32 &= 0xFFFF;
|
|
c48 += a48 + b48;
|
|
c48 &= 0xFFFF;
|
|
return goog.math.Long.fromBits((c16 << 16) | c00, (c48 << 16) | c32);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the difference of this and the given Long.
|
|
* @param {goog.math.Long} other Long to subtract from this.
|
|
* @return {!goog.math.Long} The difference of this and the given Long.
|
|
*/
|
|
goog.math.Long.prototype.subtract = function(other) {
|
|
return this.add(other.negate());
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the product of this and the given long.
|
|
* @param {goog.math.Long} other Long to multiply with this.
|
|
* @return {!goog.math.Long} The product of this and the other.
|
|
*/
|
|
goog.math.Long.prototype.multiply = function(other) {
|
|
if (this.isZero()) {
|
|
return goog.math.Long.getZero();
|
|
} else if (other.isZero()) {
|
|
return goog.math.Long.getZero();
|
|
}
|
|
|
|
if (this.equals(goog.math.Long.getMinValue())) {
|
|
return other.isOdd() ? goog.math.Long.getMinValue() :
|
|
goog.math.Long.getZero();
|
|
} else if (other.equals(goog.math.Long.getMinValue())) {
|
|
return this.isOdd() ? goog.math.Long.getMinValue() :
|
|
goog.math.Long.getZero();
|
|
}
|
|
|
|
if (this.isNegative()) {
|
|
if (other.isNegative()) {
|
|
return this.negate().multiply(other.negate());
|
|
} else {
|
|
return this.negate().multiply(other).negate();
|
|
}
|
|
} else if (other.isNegative()) {
|
|
return this.multiply(other.negate()).negate();
|
|
}
|
|
|
|
// If both longs are small, use float multiplication
|
|
if (this.lessThan(goog.math.Long.getTwoPwr24()) &&
|
|
other.lessThan(goog.math.Long.getTwoPwr24())) {
|
|
return goog.math.Long.fromNumber(this.toNumber() * other.toNumber());
|
|
}
|
|
|
|
// Divide each long into 4 chunks of 16 bits, and then add up 4x4 products.
|
|
// We can skip products that would overflow.
|
|
|
|
var a48 = this.high_ >>> 16;
|
|
var a32 = this.high_ & 0xFFFF;
|
|
var a16 = this.low_ >>> 16;
|
|
var a00 = this.low_ & 0xFFFF;
|
|
|
|
var b48 = other.high_ >>> 16;
|
|
var b32 = other.high_ & 0xFFFF;
|
|
var b16 = other.low_ >>> 16;
|
|
var b00 = other.low_ & 0xFFFF;
|
|
|
|
var c48 = 0, c32 = 0, c16 = 0, c00 = 0;
|
|
c00 += a00 * b00;
|
|
c16 += c00 >>> 16;
|
|
c00 &= 0xFFFF;
|
|
c16 += a16 * b00;
|
|
c32 += c16 >>> 16;
|
|
c16 &= 0xFFFF;
|
|
c16 += a00 * b16;
|
|
c32 += c16 >>> 16;
|
|
c16 &= 0xFFFF;
|
|
c32 += a32 * b00;
|
|
c48 += c32 >>> 16;
|
|
c32 &= 0xFFFF;
|
|
c32 += a16 * b16;
|
|
c48 += c32 >>> 16;
|
|
c32 &= 0xFFFF;
|
|
c32 += a00 * b32;
|
|
c48 += c32 >>> 16;
|
|
c32 &= 0xFFFF;
|
|
c48 += a48 * b00 + a32 * b16 + a16 * b32 + a00 * b48;
|
|
c48 &= 0xFFFF;
|
|
return goog.math.Long.fromBits((c16 << 16) | c00, (c48 << 16) | c32);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns this Long divided by the given one.
|
|
* @param {goog.math.Long} other Long by which to divide.
|
|
* @return {!goog.math.Long} This Long divided by the given one.
|
|
*/
|
|
goog.math.Long.prototype.div = function(other) {
|
|
if (other.isZero()) {
|
|
throw Error('division by zero');
|
|
} else if (this.isZero()) {
|
|
return goog.math.Long.getZero();
|
|
}
|
|
|
|
if (this.equals(goog.math.Long.getMinValue())) {
|
|
if (other.equals(goog.math.Long.getOne()) ||
|
|
other.equals(goog.math.Long.getNegOne())) {
|
|
return goog.math.Long.getMinValue(); // recall -MIN_VALUE == MIN_VALUE
|
|
} else if (other.equals(goog.math.Long.getMinValue())) {
|
|
return goog.math.Long.getOne();
|
|
} else {
|
|
// At this point, we have |other| >= 2, so |this/other| < |MIN_VALUE|.
|
|
var halfThis = this.shiftRight(1);
|
|
var approx = halfThis.div(other).shiftLeft(1);
|
|
if (approx.equals(goog.math.Long.getZero())) {
|
|
return other.isNegative() ? goog.math.Long.getOne() :
|
|
goog.math.Long.getNegOne();
|
|
} else {
|
|
var rem = this.subtract(other.multiply(approx));
|
|
var result = approx.add(rem.div(other));
|
|
return result;
|
|
}
|
|
}
|
|
} else if (other.equals(goog.math.Long.getMinValue())) {
|
|
return goog.math.Long.getZero();
|
|
}
|
|
|
|
if (this.isNegative()) {
|
|
if (other.isNegative()) {
|
|
return this.negate().div(other.negate());
|
|
} else {
|
|
return this.negate().div(other).negate();
|
|
}
|
|
} else if (other.isNegative()) {
|
|
return this.div(other.negate()).negate();
|
|
}
|
|
|
|
// Repeat the following until the remainder is less than other: find a
|
|
// floating-point that approximates remainder / other *from below*, add this
|
|
// into the result, and subtract it from the remainder. It is critical that
|
|
// the approximate value is less than or equal to the real value so that the
|
|
// remainder never becomes negative.
|
|
var res = goog.math.Long.getZero();
|
|
var rem = this;
|
|
while (rem.greaterThanOrEqual(other)) {
|
|
// Approximate the result of division. This may be a little greater or
|
|
// smaller than the actual value.
|
|
var approx = Math.max(1, Math.floor(rem.toNumber() / other.toNumber()));
|
|
|
|
// We will tweak the approximate result by changing it in the 48-th digit or
|
|
// the smallest non-fractional digit, whichever is larger.
|
|
var log2 = Math.ceil(Math.log(approx) / Math.LN2);
|
|
var delta = (log2 <= 48) ? 1 : Math.pow(2, log2 - 48);
|
|
|
|
// Decrease the approximation until it is smaller than the remainder. Note
|
|
// that if it is too large, the product overflows and is negative.
|
|
var approxRes = goog.math.Long.fromNumber(approx);
|
|
var approxRem = approxRes.multiply(other);
|
|
while (approxRem.isNegative() || approxRem.greaterThan(rem)) {
|
|
approx -= delta;
|
|
approxRes = goog.math.Long.fromNumber(approx);
|
|
approxRem = approxRes.multiply(other);
|
|
}
|
|
|
|
// We know the answer can't be zero... and actually, zero would cause
|
|
// infinite recursion since we would make no progress.
|
|
if (approxRes.isZero()) {
|
|
approxRes = goog.math.Long.getOne();
|
|
}
|
|
|
|
res = res.add(approxRes);
|
|
rem = rem.subtract(approxRem);
|
|
}
|
|
return res;
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns this Long modulo the given one.
|
|
* @param {goog.math.Long} other Long by which to mod.
|
|
* @return {!goog.math.Long} This Long modulo the given one.
|
|
*/
|
|
goog.math.Long.prototype.modulo = function(other) {
|
|
return this.subtract(this.div(other).multiply(other));
|
|
};
|
|
|
|
|
|
/** @return {!goog.math.Long} The bitwise-NOT of this value. */
|
|
goog.math.Long.prototype.not = function() {
|
|
return goog.math.Long.fromBits(~this.low_, ~this.high_);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the bitwise-AND of this Long and the given one.
|
|
* @param {goog.math.Long} other The Long with which to AND.
|
|
* @return {!goog.math.Long} The bitwise-AND of this and the other.
|
|
*/
|
|
goog.math.Long.prototype.and = function(other) {
|
|
return goog.math.Long.fromBits(
|
|
this.low_ & other.low_, this.high_ & other.high_);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the bitwise-OR of this Long and the given one.
|
|
* @param {goog.math.Long} other The Long with which to OR.
|
|
* @return {!goog.math.Long} The bitwise-OR of this and the other.
|
|
*/
|
|
goog.math.Long.prototype.or = function(other) {
|
|
return goog.math.Long.fromBits(
|
|
this.low_ | other.low_, this.high_ | other.high_);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns the bitwise-XOR of this Long and the given one.
|
|
* @param {goog.math.Long} other The Long with which to XOR.
|
|
* @return {!goog.math.Long} The bitwise-XOR of this and the other.
|
|
*/
|
|
goog.math.Long.prototype.xor = function(other) {
|
|
return goog.math.Long.fromBits(
|
|
this.low_ ^ other.low_, this.high_ ^ other.high_);
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns this Long with bits shifted to the left by the given amount.
|
|
* @param {number} numBits The number of bits by which to shift.
|
|
* @return {!goog.math.Long} This shifted to the left by the given amount.
|
|
*/
|
|
goog.math.Long.prototype.shiftLeft = function(numBits) {
|
|
numBits &= 63;
|
|
if (numBits == 0) {
|
|
return this;
|
|
} else {
|
|
var low = this.low_;
|
|
if (numBits < 32) {
|
|
var high = this.high_;
|
|
return goog.math.Long.fromBits(
|
|
low << numBits, (high << numBits) | (low >>> (32 - numBits)));
|
|
} else {
|
|
return goog.math.Long.fromBits(0, low << (numBits - 32));
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns this Long with bits shifted to the right by the given amount.
|
|
* The new leading bits match the current sign bit.
|
|
* @param {number} numBits The number of bits by which to shift.
|
|
* @return {!goog.math.Long} This shifted to the right by the given amount.
|
|
*/
|
|
goog.math.Long.prototype.shiftRight = function(numBits) {
|
|
numBits &= 63;
|
|
if (numBits == 0) {
|
|
return this;
|
|
} else {
|
|
var high = this.high_;
|
|
if (numBits < 32) {
|
|
var low = this.low_;
|
|
return goog.math.Long.fromBits(
|
|
(low >>> numBits) | (high << (32 - numBits)), high >> numBits);
|
|
} else {
|
|
return goog.math.Long.fromBits(
|
|
high >> (numBits - 32), high >= 0 ? 0 : -1);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* Returns this Long with bits shifted to the right by the given amount, with
|
|
* zeros placed into the new leading bits.
|
|
* @param {number} numBits The number of bits by which to shift.
|
|
* @return {!goog.math.Long} This shifted to the right by the given amount, with
|
|
* zeros placed into the new leading bits.
|
|
*/
|
|
goog.math.Long.prototype.shiftRightUnsigned = function(numBits) {
|
|
numBits &= 63;
|
|
if (numBits == 0) {
|
|
return this;
|
|
} else {
|
|
var high = this.high_;
|
|
if (numBits < 32) {
|
|
var low = this.low_;
|
|
return goog.math.Long.fromBits(
|
|
(low >>> numBits) | (high << (32 - numBits)), high >>> numBits);
|
|
} else if (numBits == 32) {
|
|
return goog.math.Long.fromBits(high, 0);
|
|
} else {
|
|
return goog.math.Long.fromBits(high >>> (numBits - 32), 0);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* @enum {number} Ids of commonly requested Long instances.
|
|
* @private
|
|
*/
|
|
goog.math.Long.ValueCacheId_ = {
|
|
MAX_VALUE: 1,
|
|
MIN_VALUE: 2,
|
|
ZERO: 3,
|
|
ONE: 4,
|
|
NEG_ONE: 5,
|
|
TWO_PWR_24: 6
|
|
};
|