diff options
Diffstat (limited to 'node_modules/node-int64')
-rw-r--r-- | node_modules/node-int64/.npmignore | 3 | ||||
-rw-r--r-- | node_modules/node-int64/Int64.js | 268 | ||||
-rw-r--r-- | node_modules/node-int64/LICENSE | 19 | ||||
-rw-r--r-- | node_modules/node-int64/README.md | 78 | ||||
-rw-r--r-- | node_modules/node-int64/package.json | 27 | ||||
-rw-r--r-- | node_modules/node-int64/test.js | 120 |
6 files changed, 515 insertions, 0 deletions
diff --git a/node_modules/node-int64/.npmignore b/node_modules/node-int64/.npmignore new file mode 100644 index 0000000..825fc67 --- /dev/null +++ b/node_modules/node-int64/.npmignore @@ -0,0 +1,3 @@ +node_modules +.DS_Store +npm-debug.log diff --git a/node_modules/node-int64/Int64.js b/node_modules/node-int64/Int64.js new file mode 100644 index 0000000..f870a2a --- /dev/null +++ b/node_modules/node-int64/Int64.js @@ -0,0 +1,268 @@ +// Int64.js +// +// Copyright (c) 2012 Robert Kieffer +// MIT License - http://opensource.org/licenses/mit-license.php + +/** + * Support for handling 64-bit int numbers in Javascript (node.js) + * + * JS Numbers are IEEE-754 binary double-precision floats, which limits the + * range of values that can be represented with integer precision to: + * + * 2^^53 <= N <= 2^53 + * + * Int64 objects wrap a node Buffer that holds the 8-bytes of int64 data. These + * objects operate directly on the buffer which means that if they are created + * using an existing buffer then setting the value will modify the Buffer, and + * vice-versa. + * + * Internal Representation + * + * The internal buffer format is Big Endian. I.e. the most-significant byte is + * at buffer[0], the least-significant at buffer[7]. For the purposes of + * converting to/from JS native numbers, the value is assumed to be a signed + * integer stored in 2's complement form. + * + * For details about IEEE-754 see: + * http://en.wikipedia.org/wiki/Double_precision_floating-point_format + */ + +// Useful masks and values for bit twiddling +var MASK31 = 0x7fffffff, VAL31 = 0x80000000; +var MASK32 = 0xffffffff, VAL32 = 0x100000000; + +// Map for converting hex octets to strings +var _HEX = []; +for (var i = 0; i < 256; i++) { + _HEX[i] = (i > 0xF ? '' : '0') + i.toString(16); +} + +// +// Int64 +// + +/** + * Constructor accepts any of the following argument types: + * + * new Int64(buffer[, offset=0]) - Existing Buffer with byte offset + * new Int64(Uint8Array[, offset=0]) - Existing Uint8Array with a byte offset + * new Int64(string) - Hex string (throws if n is outside int64 range) + * new Int64(number) - Number (throws if n is outside int64 range) + * new Int64(hi, lo) - Raw bits as two 32-bit values + */ +var Int64 = module.exports = function(a1, a2) { + if (a1 instanceof Buffer) { + this.buffer = a1; + this.offset = a2 || 0; + } else if (Object.prototype.toString.call(a1) == '[object Uint8Array]') { + // Under Browserify, Buffers can extend Uint8Arrays rather than an + // instance of Buffer. We could assume the passed in Uint8Array is actually + // a buffer but that won't handle the case where a raw Uint8Array is passed + // in. We construct a new Buffer just in case. + this.buffer = new Buffer(a1); + this.offset = a2 || 0; + } else { + this.buffer = this.buffer || new Buffer(8); + this.offset = 0; + this.setValue.apply(this, arguments); + } +}; + + +// Max integer value that JS can accurately represent +Int64.MAX_INT = Math.pow(2, 53); + +// Min integer value that JS can accurately represent +Int64.MIN_INT = -Math.pow(2, 53); + +Int64.prototype = { + + constructor: Int64, + + /** + * Do in-place 2's compliment. See + * http://en.wikipedia.org/wiki/Two's_complement + */ + _2scomp: function() { + var b = this.buffer, o = this.offset, carry = 1; + for (var i = o + 7; i >= o; i--) { + var v = (b[i] ^ 0xff) + carry; + b[i] = v & 0xff; + carry = v >> 8; + } + }, + + /** + * Set the value. Takes any of the following arguments: + * + * setValue(string) - A hexidecimal string + * setValue(number) - Number (throws if n is outside int64 range) + * setValue(hi, lo) - Raw bits as two 32-bit values + */ + setValue: function(hi, lo) { + var negate = false; + if (arguments.length == 1) { + if (typeof(hi) == 'number') { + // Simplify bitfield retrieval by using abs() value. We restore sign + // later + negate = hi < 0; + hi = Math.abs(hi); + lo = hi % VAL32; + hi = hi / VAL32; + if (hi > VAL32) throw new RangeError(hi + ' is outside Int64 range'); + hi = hi | 0; + } else if (typeof(hi) == 'string') { + hi = (hi + '').replace(/^0x/, ''); + lo = hi.substr(-8); + hi = hi.length > 8 ? hi.substr(0, hi.length - 8) : ''; + hi = parseInt(hi, 16); + lo = parseInt(lo, 16); + } else { + throw new Error(hi + ' must be a Number or String'); + } + } + + // Technically we should throw if hi or lo is outside int32 range here, but + // it's not worth the effort. Anything past the 32'nd bit is ignored. + + // Copy bytes to buffer + var b = this.buffer, o = this.offset; + for (var i = 7; i >= 0; i--) { + b[o+i] = lo & 0xff; + lo = i == 4 ? hi : lo >>> 8; + } + + // Restore sign of passed argument + if (negate) this._2scomp(); + }, + + /** + * Convert to a native JS number. + * + * WARNING: Do not expect this value to be accurate to integer precision for + * large (positive or negative) numbers! + * + * @param allowImprecise If true, no check is performed to verify the + * returned value is accurate to integer precision. If false, imprecise + * numbers (very large positive or negative numbers) will be forced to +/- + * Infinity. + */ + toNumber: function(allowImprecise) { + var b = this.buffer, o = this.offset; + + // Running sum of octets, doing a 2's complement + var negate = b[o] & 0x80, x = 0, carry = 1; + for (var i = 7, m = 1; i >= 0; i--, m *= 256) { + var v = b[o+i]; + + // 2's complement for negative numbers + if (negate) { + v = (v ^ 0xff) + carry; + carry = v >> 8; + v = v & 0xff; + } + + x += v * m; + } + + // Return Infinity if we've lost integer precision + if (!allowImprecise && x >= Int64.MAX_INT) { + return negate ? -Infinity : Infinity; + } + + return negate ? -x : x; + }, + + /** + * Convert to a JS Number. Returns +/-Infinity for values that can't be + * represented to integer precision. + */ + valueOf: function() { + return this.toNumber(false); + }, + + /** + * Return string value + * + * @param radix Just like Number#toString()'s radix + */ + toString: function(radix) { + return this.valueOf().toString(radix || 10); + }, + + /** + * Return a string showing the buffer octets, with MSB on the left. + * + * @param sep separator string. default is '' (empty string) + */ + toOctetString: function(sep) { + var out = new Array(8); + var b = this.buffer, o = this.offset; + for (var i = 0; i < 8; i++) { + out[i] = _HEX[b[o+i]]; + } + return out.join(sep || ''); + }, + + /** + * Returns the int64's 8 bytes in a buffer. + * + * @param {bool} [rawBuffer=false] If no offset and this is true, return the internal buffer. Should only be used if + * you're discarding the Int64 afterwards, as it breaks encapsulation. + */ + toBuffer: function(rawBuffer) { + if (rawBuffer && this.offset === 0) return this.buffer; + + var out = new Buffer(8); + this.buffer.copy(out, 0, this.offset, this.offset + 8); + return out; + }, + + /** + * Copy 8 bytes of int64 into target buffer at target offset. + * + * @param {Buffer} targetBuffer Buffer to copy into. + * @param {number} [targetOffset=0] Offset into target buffer. + */ + copy: function(targetBuffer, targetOffset) { + this.buffer.copy(targetBuffer, targetOffset || 0, this.offset, this.offset + 8); + }, + + /** + * Returns a number indicating whether this comes before or after or is the + * same as the other in sort order. + * + * @param {Int64} other Other Int64 to compare. + */ + compare: function(other) { + + // If sign bits differ ... + if ((this.buffer[this.offset] & 0x80) != (other.buffer[other.offset] & 0x80)) { + return other.buffer[other.offset] - this.buffer[this.offset]; + } + + // otherwise, compare bytes lexicographically + for (var i = 0; i < 8; i++) { + if (this.buffer[this.offset+i] !== other.buffer[other.offset+i]) { + return this.buffer[this.offset+i] - other.buffer[other.offset+i]; + } + } + return 0; + }, + + /** + * Returns a boolean indicating if this integer is equal to other. + * + * @param {Int64} other Other Int64 to compare. + */ + equals: function(other) { + return this.compare(other) === 0; + }, + + /** + * Pretty output in console.log + */ + inspect: function() { + return '[Int64 value:' + this + ' octets:' + this.toOctetString(' ') + ']'; + } +}; diff --git a/node_modules/node-int64/LICENSE b/node_modules/node-int64/LICENSE new file mode 100644 index 0000000..ddb6a90 --- /dev/null +++ b/node_modules/node-int64/LICENSE @@ -0,0 +1,19 @@ +Copyright (c) 2014 Robert Kieffer + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. diff --git a/node_modules/node-int64/README.md b/node_modules/node-int64/README.md new file mode 100644 index 0000000..efef18a --- /dev/null +++ b/node_modules/node-int64/README.md @@ -0,0 +1,78 @@ +JavaScript Numbers are represented as [IEEE 754 double-precision floats](http://steve.hollasch.net/cgindex/coding/ieeefloat.html). Unfortunately, this means they lose integer precision for values beyond +/- 2^^53. For projects that need to accurately handle 64-bit ints, such as [node-thrift](https://github.com/wadey/node-thrift), a performant, Number-like class is needed. Int64 is that class. + +Int64 instances look and feel much like JS-native Numbers. By way of example ... +```js +// First, let's illustrate the problem ... +> (0x123456789).toString(16) +'123456789' // <- what we expect. +> (0x123456789abcdef0).toString(16) +'123456789abcdf00' // <- Ugh! JS doesn't do big ints. :( + +// So let's create a couple Int64s using the above values ... + +// Require, of course +> Int64 = require('node-int64') + +// x's value is what we expect (the decimal value of 0x123456789) +> x = new Int64(0x123456789) +[Int64 value:4886718345 octets:00 00 00 01 23 45 67 89] + +// y's value is Infinity because it's outside the range of integer +// precision. But that's okay - it's still useful because it's internal +// representation (octets) is what we passed in +> y = new Int64('123456789abcdef0') +[Int64 value:Infinity octets:12 34 56 78 9a bc de f0] + +// Let's do some math. Int64's behave like Numbers. (Sorry, Int64 isn't +// for doing 64-bit integer arithmetic (yet) - it's just for carrying +// around int64 values +> x + 1 +4886718346 +> y + 1 +Infinity + +// Int64 string operations ... +> 'value: ' + x +'value: 4886718345' +> 'value: ' + y +'value: Infinity' +> x.toString(2) +'100100011010001010110011110001001' +> y.toString(2) +'Infinity' + +// Use JS's isFinite() method to see if the Int64 value is in the +// integer-precise range of JS values +> isFinite(x) +true +> isFinite(y) +false + +// Get an octet string representation. (Yay, y is what we put in!) +> x.toOctetString() +'0000000123456789' +> y.toOctetString() +'123456789abcdef0' + +// Finally, some other ways to create Int64s ... + +// Pass hi/lo words +> new Int64(0x12345678, 0x9abcdef0) +[Int64 value:Infinity octets:12 34 56 78 9a bc de f0] + +// Pass a Buffer +> new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])) +[Int64 value:Infinity octets:12 34 56 78 9a bc de f0] + +// Pass a Buffer and offset +> new Int64(new Buffer([0,0,0,0,0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0]), 4) +[Int64 value:Infinity octets:12 34 56 78 9a bc de f0] + +// Pull out into a buffer +> new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).toBuffer() +<Buffer 12 34 56 78 9a bc de f0> + +// Or copy into an existing one (at an offset) +> var buf = new Buffer(1024); +> new Int64(new Buffer([0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0])).copy(buf, 512); +``` diff --git a/node_modules/node-int64/package.json b/node_modules/node-int64/package.json new file mode 100644 index 0000000..3f56f5b --- /dev/null +++ b/node_modules/node-int64/package.json @@ -0,0 +1,27 @@ +{ + "name": "node-int64", + "description": "Support for representing 64-bit integers in JavaScript", + "url": "http://github.com/broofa/node-int64", + "keywords": [ + "math", + "integer", + "int64" + ], + "author": "Robert Kieffer <robert@broofa.com>", + "contributors": [], + "dependencies": {}, + "license": "MIT", + "lib": ".", + "main": "./Int64.js", + "version": "0.4.0", + "scripts": { + "test": "nodeunit test.js" + }, + "repository": { + "type": "git", + "url": "https://github.com/broofa/node-int64" + }, + "devDependencies": { + "nodeunit": "^0.9.0" + } +} diff --git a/node_modules/node-int64/test.js b/node_modules/node-int64/test.js new file mode 100644 index 0000000..cdf4303 --- /dev/null +++ b/node_modules/node-int64/test.js @@ -0,0 +1,120 @@ +var assert = require('assert'); +var Int64 = require('./Int64'); + +exports.setUp = function(done) { + done(); +}; + +exports.testBufferToString = function(test) { + var int = new Int64(0xfffaffff, 0xfffff700); + test.equal( + int.toBuffer().toString('hex'), + 'fffafffffffff700', + 'Buffer to string conversion' + ); + test.done(); +}; + +exports.testBufferCopy = function(test) { + var src = new Int64(0xfffaffff, 0xfffff700); + var dst = new Buffer(8); + + src.copy(dst); + + test.deepEqual( + dst, + new Buffer([0xff, 0xfa, 0xff, 0xff, 0xff, 0xff, 0xf7, 0x00]), + 'Copy to buffer' + ); + + test.done(); +}; + +exports.testValueRepresentation = function(test) { + var args = [ + [0], '0000000000000000', 0, + [1], '0000000000000001', 1, + [-1], 'ffffffffffffffff', -1, + [1e18], '0de0b6b3a7640000', 1e18, + ['0001234500654321'], '0001234500654321', 0x1234500654321, + ['0ff1234500654321'], '0ff1234500654321', 0xff1234500654300, // Imprecise! + [0xff12345, 0x654321], '0ff1234500654321', 0xff1234500654300, // Imprecise! + [0xfffaffff, 0xfffff700],'fffafffffffff700', -0x5000000000900, + [0xafffffff, 0xfffff700],'affffffffffff700', -0x5000000000000800, // Imprecise! + ['0x0000123450654321'], '0000123450654321', 0x123450654321, + ['0xFFFFFFFFFFFFFFFF'], 'ffffffffffffffff', -1 + ]; + + // Test constructor argments + + for (var i = 0; i < args.length; i += 3) { + var a = args[i], octets = args[i+1], number = args[i+2]; + + // Create instance + var x = new Int64(); + Int64.apply(x, a); + + test.equal(x.toOctetString(), octets, 'Constuctor with ' + args.join(', ')); + test.equal(x.toNumber(true), number); + } + + test.done(); +}; + +exports.testBufferOffsets = function(test) { + var sourceBuffer = new Buffer(16); + sourceBuffer.writeUInt32BE(0xfffaffff, 2); + sourceBuffer.writeUInt32BE(0xfffff700, 6); + + var int = new Int64(sourceBuffer, 2); + assert.equal( + int.toBuffer().toString('hex'), 'fffafffffffff700', + 'Construct from offset' + ); + + var targetBuffer = new Buffer(16); + int.copy(targetBuffer, 4); + assert.equal( + targetBuffer.slice(4, 12).toString('hex'), 'fffafffffffff700', + 'Copy to offset' + ); + + test.done(); +}; + +exports.testInstanceOf = function(test) { + var x = new Int64(); + assert(x instanceof Int64, 'Variable is not instance of Int64'); + var y = {}; + assert(!(y instanceof Int64), 'Object is an instance of Int64'); + test.done(); +}; + +exports.testCompare = function(test) { + var intMin = new Int64(2147483648, 0); + var intMinPlusOne = new Int64(2147483648, 1); + var zero = new Int64(0, 0); + var intMaxMinusOne = new Int64(2147483647, 4294967294); + var intMax = new Int64(2147483647, 4294967295); + assert(intMin.compare(intMinPlusOne) < 0, "INT64_MIN is not less than INT64_MIN+1"); + assert(intMin.compare(zero) < 0, "INT64_MIN is not less than 0"); + assert(intMin.compare(zero) < intMax, "INT64_MIN is not less than INT64_MAX"); + assert(intMax.compare(intMaxMinusOne) > 0, "INT64_MAX is not greater than INT64_MAX-1"); + assert(intMax.compare(zero) > 0, "INT64_MAX is not greater than 0"); + assert(intMax.compare(intMin) > 0, "INT64_MAX is not greater than INT_MIN"); + test.done(); +}; + +exports.testEquals = function(test) { + var intMin = new Int64(2147483648, 0); + var zero = new Int64(0, 0); + var intMax = new Int64(2147483647, 4294967295); + assert(intMin.equals(intMin), "INT64_MIN !== INT64_MIN"); + assert(intMax.equals(intMax), "INT64_MAX !== INT64_MAX"); + assert(zero.equals(zero), "0 !== 0"); + assert(!intMin.equals(zero), "INT64_MIN === 0"); + assert(!intMin.equals(intMax), "INT64_MIN === INT64_MAX"); + assert(!intMax.equals(zero), "INT64_MAX === 0"); + assert(!intMax.equals(intMin), "INT64_MAX === INT64_MIN"); + test.done(); +}; |