# Source: node_modules/bson/lib/bson/long.js

``````'use strict';
// 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
//
//
// 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.
//

/**
* Defines a Long class for representing a 64-bit two's-complement
* integer value, which faithfully simulates the behavior of a Java "Long". This
* implementation is derived from LongLib in GWT.
*
* Constructs a 64-bit two's-complement integer, given its low and high 32-bit
* values as *signed* integers.  See the from* functions below for more
* convenient ways of constructing Longs.
*
* The internal representation of a Long is the two given signed, 32-bit values.
* We use 32-bit pieces because these are the size of integers on which
* Javascript performs bit-operations.  For operations like addition and
* multiplication, we split each number into 16-bit pieces, which can easily be
* multiplied within Javascript's floating-point representation without overflow
* or change in sign.
*
* In the algorithms below, we frequently reduce the negative case to the
* positive case by negating the input(s) and then post-processing the result.
* Note that we must ALWAYS check specially whether those values are MIN_VALUE
* (-2^63) because -MIN_VALUE == MIN_VALUE (since 2^63 cannot be represented as
* a positive number, it overflows back into a negative).  Not handling this
* case would often result in infinite recursion.
*
* @class
* @param {number} low  the low (signed) 32 bits of the Long.
* @param {number} high the high (signed) 32 bits of the Long.
* @return {Long}
*/
function Long(low, high) {
if (!(this instanceof Long)) return new Long(low, high);

this._bsontype = 'Long';
/**
* @type {number}
* @ignore
*/
this.low_ = low | 0; // force into 32 signed bits.

/**
* @type {number}
* @ignore
*/
this.high_ = high | 0; // force into 32 signed bits.
}

/**
* Return the int value.
*
* @method
* @return {number} the value, assuming it is a 32-bit integer.
*/
Long.prototype.toInt = function() {
return this.low_;
};

/**
* Return the Number value.
*
* @method
* @return {number} the closest floating-point representation to this value.
*/
Long.prototype.toNumber = function() {
return this.high_ * Long.TWO_PWR_32_DBL_ + this.getLowBitsUnsigned();
};

/**
* Return the JSON value.
*
* @method
* @return {string} the JSON representation.
*/
Long.prototype.toJSON = function() {
return this.toString();
};

/**
* Return the String value.
*
* @method
* @param {number} [opt_radix] the radix in which the text should be written.
* @return {string} the textual representation of this value.
*/
Long.prototype.toString = function(opt_radix) {
if (radix < 2 || 36 < radix) {
throw Error('radix out of range: ' + radix);
}

if (this.isZero()) {
return '0';
}

if (this.isNegative()) {
if (this.equals(Long.MIN_VALUE)) {
// We need to change the Long value before it can be negated, so we remove
// the bottom-most digit in this base and then recurse to do the rest.
var div = this.div(radixLong);
var rem = div.multiply(radixLong).subtract(this);
} else {
return '-' + this.negate().toString(radix);
}
}

// Do several (6) digits each time through the loop, so as to
// minimize the calls to the very expensive emulated div.

rem = this;
var result = '';

while (!rem.isZero()) {
var remDiv = rem.div(radixToPower);
var intval = rem.subtract(remDiv.multiply(radixToPower)).toInt();
var digits = intval.toString(radix);

rem = remDiv;
if (rem.isZero()) {
return digits + result;
} else {
while (digits.length < 6) {
digits = '0' + digits;
}
result = '' + digits + result;
}
}
};

/**
* Return the high 32-bits value.
*
* @method
* @return {number} the high 32-bits as a signed value.
*/
Long.prototype.getHighBits = function() {
return this.high_;
};

/**
* Return the low 32-bits value.
*
* @method
* @return {number} the low 32-bits as a signed value.
*/
Long.prototype.getLowBits = function() {
return this.low_;
};

/**
* Return the low unsigned 32-bits value.
*
* @method
* @return {number} the low 32-bits as an unsigned value.
*/
Long.prototype.getLowBitsUnsigned = function() {
return this.low_ >= 0 ? this.low_ : Long.TWO_PWR_32_DBL_ + this.low_;
};

/**
* Returns the number of bits needed to represent the absolute value of this Long.
*
* @method
* @return {number} Returns the number of bits needed to represent the absolute value of this Long.
*/
Long.prototype.getNumBitsAbs = function() {
if (this.isNegative()) {
if (this.equals(Long.MIN_VALUE)) {
return 64;
} else {
return this.negate().getNumBitsAbs();
}
} else {
var val = this.high_ !== 0 ? this.high_ : this.low_;
for (var bit = 31; bit > 0; bit--) {
if ((val & (1 << bit)) !== 0) {
break;
}
}
return this.high_ !== 0 ? bit + 33 : bit + 1;
}
};

/**
* Return whether this value is zero.
*
* @method
* @return {boolean} whether this value is zero.
*/
Long.prototype.isZero = function() {
return this.high_ === 0 && this.low_ === 0;
};

/**
* Return whether this value is negative.
*
* @method
* @return {boolean} whether this value is negative.
*/
Long.prototype.isNegative = function() {
return this.high_ < 0;
};

/**
* Return whether this value is odd.
*
* @method
* @return {boolean} whether this value is odd.
*/
Long.prototype.isOdd = function() {
return (this.low_ & 1) === 1;
};

/**
* Return whether this Long equals the other
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} whether this Long equals the other
*/
Long.prototype.equals = function(other) {
return this.high_ === other.high_ && this.low_ === other.low_;
};

/**
* Return whether this Long does not equal the other.
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} whether this Long does not equal the other.
*/
Long.prototype.notEquals = function(other) {
return this.high_ !== other.high_ || this.low_ !== other.low_;
};

/**
* Return whether this Long is less than the other.
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} whether this Long is less than the other.
*/
Long.prototype.lessThan = function(other) {
return this.compare(other) < 0;
};

/**
* Return whether this Long is less than or equal to the other.
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} whether this Long is less than or equal to the other.
*/
Long.prototype.lessThanOrEqual = function(other) {
return this.compare(other) <= 0;
};

/**
* Return whether this Long is greater than the other.
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} whether this Long is greater than the other.
*/
Long.prototype.greaterThan = function(other) {
return this.compare(other) > 0;
};

/**
* Return whether this Long is greater than or equal to the other.
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} whether this Long is greater than or equal to the other.
*/
Long.prototype.greaterThanOrEqual = function(other) {
return this.compare(other) >= 0;
};

/**
* Compares this Long with the given one.
*
* @method
* @param {Long} other Long to compare against.
* @return {boolean} 0 if they are the same, 1 if the this is greater, and -1 if the given one is greater.
*/
Long.prototype.compare = function(other) {
if (this.equals(other)) {
return 0;
}

var thisNeg = this.isNegative();
var otherNeg = other.isNegative();
if (thisNeg && !otherNeg) {
return -1;
}
if (!thisNeg && otherNeg) {
return 1;
}

// at this point, the signs are the same, so subtraction will not overflow
if (this.subtract(other).isNegative()) {
return -1;
} else {
return 1;
}
};

/**
* The negation of this value.
*
* @method
* @return {Long} the negation of this value.
*/
Long.prototype.negate = function() {
if (this.equals(Long.MIN_VALUE)) {
return Long.MIN_VALUE;
} else {
}
};

/**
* Returns the sum of this and the given Long.
*
* @method
* @param {Long} other Long to add to this one.
* @return {Long} the sum of this and the given Long.
*/
Long.prototype.add = function(other) {
// Divide each number into 4 chunks of 16 bits, and then sum the chunks.

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 + b16;
c32 += c16 >>> 16;
c16 &= 0xffff;
c32 += a32 + b32;
c48 += c32 >>> 16;
c32 &= 0xffff;
c48 += a48 + b48;
c48 &= 0xffff;
return Long.fromBits((c16 << 16) | c00, (c48 << 16) | c32);
};

/**
* Returns the difference of this and the given Long.
*
* @method
* @param {Long} other Long to subtract from this.
* @return {Long} the difference of this and the given Long.
*/
Long.prototype.subtract = function(other) {
};

/**
* Returns the product of this and the given Long.
*
* @method
* @param {Long} other Long to multiply with this.
* @return {Long} the product of this and the other.
*/
Long.prototype.multiply = function(other) {
if (this.isZero()) {
return Long.ZERO;
} else if (other.isZero()) {
return Long.ZERO;
}

if (this.equals(Long.MIN_VALUE)) {
return other.isOdd() ? Long.MIN_VALUE : Long.ZERO;
} else if (other.equals(Long.MIN_VALUE)) {
return this.isOdd() ? Long.MIN_VALUE : Long.ZERO;
}

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(Long.TWO_PWR_24_) && other.lessThan(Long.TWO_PWR_24_)) {
return 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 Long.fromBits((c16 << 16) | c00, (c48 << 16) | c32);
};

/**
* Returns this Long divided by the given one.
*
* @method
* @param {Long} other Long by which to divide.
* @return {Long} this Long divided by the given one.
*/
Long.prototype.div = function(other) {
if (other.isZero()) {
throw Error('division by zero');
} else if (this.isZero()) {
return Long.ZERO;
}

if (this.equals(Long.MIN_VALUE)) {
if (other.equals(Long.ONE) || other.equals(Long.NEG_ONE)) {
return Long.MIN_VALUE; // recall that -MIN_VALUE == MIN_VALUE
} else if (other.equals(Long.MIN_VALUE)) {
return Long.ONE;
} 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(Long.ZERO)) {
return other.isNegative() ? Long.ONE : Long.NEG_ONE;
} else {
var rem = this.subtract(other.multiply(approx));
var result = approx.add(rem.div(other));
return result;
}
}
} else if (other.equals(Long.MIN_VALUE)) {
return Long.ZERO;
}

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 = Long.ZERO;
rem = this;
while (rem.greaterThanOrEqual(other)) {
// Approximate the result of division. This may be a little greater or
// smaller than the actual value.
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 = Long.fromNumber(approx);
var approxRem = approxRes.multiply(other);
while (approxRem.isNegative() || approxRem.greaterThan(rem)) {
approx -= delta;
approxRes = 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 = Long.ONE;
}

rem = rem.subtract(approxRem);
}
return res;
};

/**
* Returns this Long modulo the given one.
*
* @method
* @param {Long} other Long by which to mod.
* @return {Long} this Long modulo the given one.
*/
Long.prototype.modulo = function(other) {
return this.subtract(this.div(other).multiply(other));
};

/**
* The bitwise-NOT of this value.
*
* @method
* @return {Long} the bitwise-NOT of this value.
*/
Long.prototype.not = function() {
return Long.fromBits(~this.low_, ~this.high_);
};

/**
* Returns the bitwise-AND of this Long and the given one.
*
* @method
* @param {Long} other the Long with which to AND.
* @return {Long} the bitwise-AND of this and the other.
*/
Long.prototype.and = function(other) {
return Long.fromBits(this.low_ & other.low_, this.high_ & other.high_);
};

/**
* Returns the bitwise-OR of this Long and the given one.
*
* @method
* @param {Long} other the Long with which to OR.
* @return {Long} the bitwise-OR of this and the other.
*/
Long.prototype.or = function(other) {
return Long.fromBits(this.low_ | other.low_, this.high_ | other.high_);
};

/**
* Returns the bitwise-XOR of this Long and the given one.
*
* @method
* @param {Long} other the Long with which to XOR.
* @return {Long} the bitwise-XOR of this and the other.
*/
Long.prototype.xor = function(other) {
return Long.fromBits(this.low_ ^ other.low_, this.high_ ^ other.high_);
};

/**
* Returns this Long with bits shifted to the left by the given amount.
*
* @method
* @param {number} numBits the number of bits by which to shift.
* @return {Long} this shifted to the left by the given amount.
*/
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 Long.fromBits(low << numBits, (high << numBits) | (low >>> (32 - numBits)));
} else {
return Long.fromBits(0, low << (numBits - 32));
}
}
};

/**
* Returns this Long with bits shifted to the right by the given amount.
*
* @method
* @param {number} numBits the number of bits by which to shift.
* @return {Long} this shifted to the right by the given amount.
*/
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 Long.fromBits((low >>> numBits) | (high << (32 - numBits)), high >> numBits);
} else {
return Long.fromBits(high >> (numBits - 32), high >= 0 ? 0 : -1);
}
}
};

/**
* Returns this Long with bits shifted to the right by the given amount, with the new top bits matching the current sign bit.
*
* @method
* @param {number} numBits the number of bits by which to shift.
* @return {Long} this shifted to the right by the given amount, with zeros placed into the new leading bits.
*/
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 Long.fromBits((low >>> numBits) | (high << (32 - numBits)), high >>> numBits);
} else if (numBits === 32) {
return Long.fromBits(high, 0);
} else {
return Long.fromBits(high >>> (numBits - 32), 0);
}
}
};

/**
* Returns a Long representing the given (32-bit) integer value.
*
* @method
* @param {number} value the 32-bit integer in question.
* @return {Long} the corresponding Long value.
*/
Long.fromInt = function(value) {
if (-128 <= value && value < 128) {
var cachedObj = Long.INT_CACHE_[value];
if (cachedObj) {
return cachedObj;
}
}

var obj = new Long(value | 0, value < 0 ? -1 : 0);
if (-128 <= value && value < 128) {
Long.INT_CACHE_[value] = obj;
}
return obj;
};

/**
* Returns a Long representing the given value, provided that it is a finite number. Otherwise, zero is returned.
*
* @method
* @param {number} value the number in question.
* @return {Long} the corresponding Long value.
*/
Long.fromNumber = function(value) {
if (isNaN(value) || !isFinite(value)) {
return Long.ZERO;
} else if (value <= -Long.TWO_PWR_63_DBL_) {
return Long.MIN_VALUE;
} else if (value + 1 >= Long.TWO_PWR_63_DBL_) {
return Long.MAX_VALUE;
} else if (value < 0) {
return Long.fromNumber(-value).negate();
} else {
return new Long((value % Long.TWO_PWR_32_DBL_) | 0, (value / Long.TWO_PWR_32_DBL_) | 0);
}
};

/**
* Returns a Long representing the 64-bit integer that comes by concatenating the given high and low bits. Each is assumed to use 32 bits.
*
* @method
* @param {number} lowBits the low 32-bits.
* @param {number} highBits the high 32-bits.
* @return {Long} the corresponding Long value.
*/
Long.fromBits = function(lowBits, highBits) {
return new Long(lowBits, highBits);
};

/**
* Returns a Long representation of the given string, written using the given radix.
*
* @method
* @param {string} str the textual representation of the Long.
* @param {number} opt_radix the radix in which the text is written.
* @return {Long} the corresponding Long value.
*/
Long.fromString = function(str, opt_radix) {
if (str.length === 0) {
throw Error('number format error: empty string');
}

if (radix < 2 || 36 < radix) {
throw Error('radix out of range: ' + radix);
}

if (str.charAt(0) === '-') {
} else if (str.indexOf('-') >= 0) {
throw Error('number format error: interior "-" character: ' + str);
}

// Do several (8) digits each time through the loop, so as to
// minimize the calls to the very expensive emulated div.

var result = Long.ZERO;
for (var i = 0; i < str.length; i += 8) {
var size = Math.min(8, str.length - i);
var value = parseInt(str.substring(i, i + size), radix);
if (size < 8) {
var power = Long.fromNumber(Math.pow(radix, size));
} else {
}
}
return result;
};

// NOTE: Common constant values ZERO, ONE, NEG_ONE, etc. are defined below the
// from* methods on which they depend.

/**
* A cache of the Long representations of small integer values.
* @type {Object}
* @ignore
*/
Long.INT_CACHE_ = {};

// NOTE: the compiler should inline these constant values below and then remove
// these variables, so there should be no runtime penalty for these.

/**
* Number used repeated below in calculations.  This must appear before the
* first call to any from* function below.
* @type {number}
* @ignore
*/
Long.TWO_PWR_16_DBL_ = 1 << 16;

/**
* @type {number}
* @ignore
*/
Long.TWO_PWR_24_DBL_ = 1 << 24;

/**
* @type {number}
* @ignore
*/
Long.TWO_PWR_32_DBL_ = Long.TWO_PWR_16_DBL_ * Long.TWO_PWR_16_DBL_;

/**
* @type {number}
* @ignore
*/
Long.TWO_PWR_31_DBL_ = Long.TWO_PWR_32_DBL_ / 2;

/**
* @type {number}
* @ignore
*/
Long.TWO_PWR_48_DBL_ = Long.TWO_PWR_32_DBL_ * Long.TWO_PWR_16_DBL_;

/**
* @type {number}
* @ignore
*/
Long.TWO_PWR_64_DBL_ = Long.TWO_PWR_32_DBL_ * Long.TWO_PWR_32_DBL_;

/**
* @type {number}
* @ignore
*/
Long.TWO_PWR_63_DBL_ = Long.TWO_PWR_64_DBL_ / 2;

/** @type {Long} */
Long.ZERO = Long.fromInt(0);

/** @type {Long} */
Long.ONE = Long.fromInt(1);

/** @type {Long} */
Long.NEG_ONE = Long.fromInt(-1);

/** @type {Long} */
Long.MAX_VALUE = Long.fromBits(0xffffffff | 0, 0x7fffffff | 0);

/** @type {Long} */
Long.MIN_VALUE = Long.fromBits(0, 0x80000000 | 0);

/**
* @type {Long}
* @ignore
*/
Long.TWO_PWR_24_ = Long.fromInt(1 << 24);

/**
* Expose.
*/
module.exports = Long;
module.exports.Long = Long;
``````