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Diffstat (limited to 'node.d/node_modules/node-int64.js')
| -rw-r--r-- | node.d/node_modules/node-int64.js | 268 |
1 files changed, 0 insertions, 268 deletions
diff --git a/node.d/node_modules/node-int64.js b/node.d/node_modules/node-int64.js deleted file mode 100644 index f870a2a94..000000000 --- a/node.d/node_modules/node-int64.js +++ /dev/null @@ -1,268 +0,0 @@ -// 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(' ') + ']'; - } -}; |