452 lines
9.7 KiB
JavaScript
452 lines
9.7 KiB
JavaScript
/**
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C-like unsigned 32 bits integers in Javascript
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Copyright (C) 2013, Pierre Curto
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MIT license
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*/
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;(function (root) {
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// Local cache for typical radices
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var radixPowerCache = {
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36: UINT32( Math.pow(36, 5) )
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, 16: UINT32( Math.pow(16, 7) )
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, 10: UINT32( Math.pow(10, 9) )
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, 2: UINT32( Math.pow(2, 30) )
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}
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var radixCache = {
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36: UINT32(36)
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, 16: UINT32(16)
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, 10: UINT32(10)
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, 2: UINT32(2)
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}
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/**
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* Represents an unsigned 32 bits integer
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* @constructor
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* @param {Number|String|Number} low bits | integer as a string | integer as a number
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* @param {Number|Number|Undefined} high bits | radix (optional, default=10)
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* @return
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*/
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function UINT32 (l, h) {
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if ( !(this instanceof UINT32) )
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return new UINT32(l, h)
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this._low = 0
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this._high = 0
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this.remainder = null
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if (typeof h == 'undefined')
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return fromNumber.call(this, l)
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if (typeof l == 'string')
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return fromString.call(this, l, h)
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fromBits.call(this, l, h)
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}
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/**
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* Set the current _UINT32_ object with its low and high bits
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* @method fromBits
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* @param {Number} low bits
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* @param {Number} high bits
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* @return ThisExpression
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*/
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function fromBits (l, h) {
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this._low = l | 0
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this._high = h | 0
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return this
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}
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UINT32.prototype.fromBits = fromBits
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/**
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* Set the current _UINT32_ object from a number
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* @method fromNumber
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* @param {Number} number
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* @return ThisExpression
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*/
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function fromNumber (value) {
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this._low = value & 0xFFFF
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this._high = value >>> 16
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return this
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}
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UINT32.prototype.fromNumber = fromNumber
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/**
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* Set the current _UINT32_ object from a string
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* @method fromString
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* @param {String} integer as a string
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* @param {Number} radix (optional, default=10)
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* @return ThisExpression
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*/
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function fromString (s, radix) {
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var value = parseInt(s, radix || 10)
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this._low = value & 0xFFFF
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this._high = value >>> 16
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return this
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}
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UINT32.prototype.fromString = fromString
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/**
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* Convert this _UINT32_ to a number
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* @method toNumber
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* @return {Number} the converted UINT32
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*/
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UINT32.prototype.toNumber = function () {
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return (this._high * 65536) + this._low
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}
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/**
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* Convert this _UINT32_ to a string
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* @method toString
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* @param {Number} radix (optional, default=10)
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* @return {String} the converted UINT32
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*/
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UINT32.prototype.toString = function (radix) {
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return this.toNumber().toString(radix || 10)
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}
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/**
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* Add two _UINT32_. The current _UINT32_ stores the result
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* @method add
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.add = function (other) {
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var a00 = this._low + other._low
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var a16 = a00 >>> 16
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a16 += this._high + other._high
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this._low = a00 & 0xFFFF
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this._high = a16 & 0xFFFF
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return this
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}
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/**
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* Subtract two _UINT32_. The current _UINT32_ stores the result
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* @method subtract
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.subtract = function (other) {
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//TODO inline
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return this.add( other.clone().negate() )
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}
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/**
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* Multiply two _UINT32_. The current _UINT32_ stores the result
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* @method multiply
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.multiply = function (other) {
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/*
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a = a00 + a16
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b = b00 + b16
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a*b = (a00 + a16)(b00 + b16)
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= a00b00 + a00b16 + a16b00 + a16b16
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a16b16 overflows the 32bits
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*/
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var a16 = this._high
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var a00 = this._low
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var b16 = other._high
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var b00 = other._low
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/* Removed to increase speed under normal circumstances (i.e. not multiplying by 0 or 1)
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// this == 0 or other == 1: nothing to do
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if ((a00 == 0 && a16 == 0) || (b00 == 1 && b16 == 0)) return this
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// other == 0 or this == 1: this = other
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if ((b00 == 0 && b16 == 0) || (a00 == 1 && a16 == 0)) {
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this._low = other._low
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this._high = other._high
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return this
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}
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*/
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var c16, c00
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c00 = a00 * b00
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c16 = c00 >>> 16
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c16 += a16 * b00
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c16 &= 0xFFFF // Not required but improves performance
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c16 += a00 * b16
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this._low = c00 & 0xFFFF
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this._high = c16 & 0xFFFF
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return this
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}
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/**
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* Divide two _UINT32_. The current _UINT32_ stores the result.
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* The remainder is made available as the _remainder_ property on
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* the _UINT32_ object. It can be null, meaning there are no remainder.
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* @method div
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.div = function (other) {
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if ( (other._low == 0) && (other._high == 0) ) throw Error('division by zero')
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// other == 1
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if (other._high == 0 && other._low == 1) {
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this.remainder = new UINT32(0)
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return this
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}
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// other > this: 0
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if ( other.gt(this) ) {
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this.remainder = this.clone()
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this._low = 0
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this._high = 0
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return this
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}
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// other == this: 1
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if ( this.eq(other) ) {
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this.remainder = new UINT32(0)
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this._low = 1
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this._high = 0
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return this
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}
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// Shift the divisor left until it is higher than the dividend
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var _other = other.clone()
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var i = -1
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while ( !this.lt(_other) ) {
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// High bit can overflow the default 16bits
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// Its ok since we right shift after this loop
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// The overflown bit must be kept though
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_other.shiftLeft(1, true)
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i++
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}
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// Set the remainder
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this.remainder = this.clone()
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// Initialize the current result to 0
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this._low = 0
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this._high = 0
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for (; i >= 0; i--) {
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_other.shiftRight(1)
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// If shifted divisor is smaller than the dividend
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// then subtract it from the dividend
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if ( !this.remainder.lt(_other) ) {
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this.remainder.subtract(_other)
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// Update the current result
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if (i >= 16) {
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this._high |= 1 << (i - 16)
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} else {
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this._low |= 1 << i
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}
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}
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}
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return this
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}
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/**
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* Negate the current _UINT32_
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* @method negate
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* @return ThisExpression
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*/
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UINT32.prototype.negate = function () {
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var v = ( ~this._low & 0xFFFF ) + 1
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this._low = v & 0xFFFF
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this._high = (~this._high + (v >>> 16)) & 0xFFFF
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return this
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}
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/**
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* Equals
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* @method eq
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* @param {Object} other UINT32
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* @return {Boolean}
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*/
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UINT32.prototype.equals = UINT32.prototype.eq = function (other) {
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return (this._low == other._low) && (this._high == other._high)
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}
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/**
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* Greater than (strict)
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* @method gt
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* @param {Object} other UINT32
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* @return {Boolean}
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*/
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UINT32.prototype.greaterThan = UINT32.prototype.gt = function (other) {
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if (this._high > other._high) return true
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if (this._high < other._high) return false
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return this._low > other._low
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}
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/**
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* Less than (strict)
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* @method lt
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* @param {Object} other UINT32
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* @return {Boolean}
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*/
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UINT32.prototype.lessThan = UINT32.prototype.lt = function (other) {
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if (this._high < other._high) return true
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if (this._high > other._high) return false
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return this._low < other._low
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}
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/**
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* Bitwise OR
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* @method or
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.or = function (other) {
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this._low |= other._low
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this._high |= other._high
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return this
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}
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/**
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* Bitwise AND
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* @method and
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.and = function (other) {
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this._low &= other._low
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this._high &= other._high
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return this
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}
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/**
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* Bitwise NOT
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* @method not
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* @return ThisExpression
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*/
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UINT32.prototype.not = function() {
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this._low = ~this._low & 0xFFFF
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this._high = ~this._high & 0xFFFF
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return this
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}
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/**
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* Bitwise XOR
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* @method xor
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* @param {Object} other UINT32
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* @return ThisExpression
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*/
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UINT32.prototype.xor = function (other) {
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this._low ^= other._low
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this._high ^= other._high
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return this
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}
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/**
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* Bitwise shift right
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* @method shiftRight
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* @param {Number} number of bits to shift
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* @return ThisExpression
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*/
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UINT32.prototype.shiftRight = UINT32.prototype.shiftr = function (n) {
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if (n > 16) {
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this._low = this._high >> (n - 16)
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this._high = 0
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} else if (n == 16) {
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this._low = this._high
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this._high = 0
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} else {
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this._low = (this._low >> n) | ( (this._high << (16-n)) & 0xFFFF )
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this._high >>= n
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}
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return this
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}
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/**
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* Bitwise shift left
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* @method shiftLeft
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* @param {Number} number of bits to shift
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* @param {Boolean} allow overflow
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* @return ThisExpression
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*/
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UINT32.prototype.shiftLeft = UINT32.prototype.shiftl = function (n, allowOverflow) {
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if (n > 16) {
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this._high = this._low << (n - 16)
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this._low = 0
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if (!allowOverflow) {
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this._high &= 0xFFFF
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}
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} else if (n == 16) {
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this._high = this._low
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this._low = 0
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} else {
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this._high = (this._high << n) | (this._low >> (16-n))
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this._low = (this._low << n) & 0xFFFF
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if (!allowOverflow) {
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// Overflow only allowed on the high bits...
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this._high &= 0xFFFF
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}
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}
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return this
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}
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/**
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* Bitwise rotate left
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* @method rotl
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* @param {Number} number of bits to rotate
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* @return ThisExpression
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*/
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UINT32.prototype.rotateLeft = UINT32.prototype.rotl = function (n) {
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var v = (this._high << 16) | this._low
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v = (v << n) | (v >>> (32 - n))
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this._low = v & 0xFFFF
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this._high = v >>> 16
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return this
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}
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/**
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* Bitwise rotate right
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* @method rotr
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* @param {Number} number of bits to rotate
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* @return ThisExpression
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*/
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UINT32.prototype.rotateRight = UINT32.prototype.rotr = function (n) {
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var v = (this._high << 16) | this._low
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v = (v >>> n) | (v << (32 - n))
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this._low = v & 0xFFFF
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this._high = v >>> 16
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return this
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}
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/**
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* Clone the current _UINT32_
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* @method clone
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* @return {Object} cloned UINT32
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*/
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UINT32.prototype.clone = function () {
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return new UINT32(this._low, this._high)
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}
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if (typeof define != 'undefined' && define.amd) {
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// AMD / RequireJS
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define([], function () {
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return UINT32
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})
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} else if (typeof module != 'undefined' && module.exports) {
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// Node.js
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module.exports = UINT32
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} else {
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// Browser
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root['UINT32'] = UINT32
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}
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})(this)
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