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630 lines
21 KiB
630 lines
21 KiB
var undefined = (void 0); // Paranoia |
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// Beyond this value, index getters/setters (i.e. array[0], array[1]) are so slow to |
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// create, and consume so much memory, that the browser appears frozen. |
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var MAX_ARRAY_LENGTH = 1e5; |
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|
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// Approximations of internal ECMAScript conversion functions |
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var ECMAScript = (function() { |
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// Stash a copy in case other scripts modify these |
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var opts = Object.prototype.toString, |
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ophop = Object.prototype.hasOwnProperty; |
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return { |
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// Class returns internal [[Class]] property, used to avoid cross-frame instanceof issues: |
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Class: function(v) { return opts.call(v).replace(/^\[object *|\]$/g, ''); }, |
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HasProperty: function(o, p) { return p in o; }, |
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HasOwnProperty: function(o, p) { return ophop.call(o, p); }, |
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IsCallable: function(o) { return typeof o === 'function'; }, |
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ToInt32: function(v) { return v >> 0; }, |
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ToUint32: function(v) { return v >>> 0; } |
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}; |
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}()); |
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// Snapshot intrinsics |
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var LN2 = Math.LN2, |
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abs = Math.abs, |
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floor = Math.floor, |
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log = Math.log, |
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min = Math.min, |
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pow = Math.pow, |
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round = Math.round; |
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// ES5: lock down object properties |
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function configureProperties(obj) { |
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if (getOwnPropNames && defineProp) { |
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var props = getOwnPropNames(obj), i; |
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for (i = 0; i < props.length; i += 1) { |
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defineProp(obj, props[i], { |
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value: obj[props[i]], |
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writable: false, |
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enumerable: false, |
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configurable: false |
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}); |
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} |
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} |
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} |
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// emulate ES5 getter/setter API using legacy APIs |
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// http://blogs.msdn.com/b/ie/archive/2010/09/07/transitioning-existing-code-to-the-es5-getter-setter-apis.aspx |
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// (second clause tests for Object.defineProperty() in IE<9 that only supports extending DOM prototypes, but |
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// note that IE<9 does not support __defineGetter__ or __defineSetter__ so it just renders the method harmless) |
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var defineProp |
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if (Object.defineProperty && (function() { |
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try { |
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Object.defineProperty({}, 'x', {}); |
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return true; |
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} catch (e) { |
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return false; |
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} |
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})()) { |
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defineProp = Object.defineProperty; |
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} else { |
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defineProp = function(o, p, desc) { |
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if (!o === Object(o)) throw new TypeError("Object.defineProperty called on non-object"); |
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if (ECMAScript.HasProperty(desc, 'get') && Object.prototype.__defineGetter__) { Object.prototype.__defineGetter__.call(o, p, desc.get); } |
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if (ECMAScript.HasProperty(desc, 'set') && Object.prototype.__defineSetter__) { Object.prototype.__defineSetter__.call(o, p, desc.set); } |
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if (ECMAScript.HasProperty(desc, 'value')) { o[p] = desc.value; } |
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return o; |
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}; |
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} |
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var getOwnPropNames = Object.getOwnPropertyNames || function (o) { |
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if (o !== Object(o)) throw new TypeError("Object.getOwnPropertyNames called on non-object"); |
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var props = [], p; |
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for (p in o) { |
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if (ECMAScript.HasOwnProperty(o, p)) { |
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props.push(p); |
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} |
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} |
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return props; |
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}; |
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// ES5: Make obj[index] an alias for obj._getter(index)/obj._setter(index, value) |
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// for index in 0 ... obj.length |
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function makeArrayAccessors(obj) { |
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if (!defineProp) { return; } |
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if (obj.length > MAX_ARRAY_LENGTH) throw new RangeError("Array too large for polyfill"); |
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function makeArrayAccessor(index) { |
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defineProp(obj, index, { |
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'get': function() { return obj._getter(index); }, |
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'set': function(v) { obj._setter(index, v); }, |
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enumerable: true, |
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configurable: false |
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}); |
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} |
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var i; |
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for (i = 0; i < obj.length; i += 1) { |
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makeArrayAccessor(i); |
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} |
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} |
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// Internal conversion functions: |
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// pack<Type>() - take a number (interpreted as Type), output a byte array |
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// unpack<Type>() - take a byte array, output a Type-like number |
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function as_signed(value, bits) { var s = 32 - bits; return (value << s) >> s; } |
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function as_unsigned(value, bits) { var s = 32 - bits; return (value << s) >>> s; } |
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function packI8(n) { return [n & 0xff]; } |
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function unpackI8(bytes) { return as_signed(bytes[0], 8); } |
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function packU8(n) { return [n & 0xff]; } |
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function unpackU8(bytes) { return as_unsigned(bytes[0], 8); } |
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function packU8Clamped(n) { n = round(Number(n)); return [n < 0 ? 0 : n > 0xff ? 0xff : n & 0xff]; } |
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function packI16(n) { return [(n >> 8) & 0xff, n & 0xff]; } |
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function unpackI16(bytes) { return as_signed(bytes[0] << 8 | bytes[1], 16); } |
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function packU16(n) { return [(n >> 8) & 0xff, n & 0xff]; } |
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function unpackU16(bytes) { return as_unsigned(bytes[0] << 8 | bytes[1], 16); } |
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function packI32(n) { return [(n >> 24) & 0xff, (n >> 16) & 0xff, (n >> 8) & 0xff, n & 0xff]; } |
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function unpackI32(bytes) { return as_signed(bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3], 32); } |
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function packU32(n) { return [(n >> 24) & 0xff, (n >> 16) & 0xff, (n >> 8) & 0xff, n & 0xff]; } |
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function unpackU32(bytes) { return as_unsigned(bytes[0] << 24 | bytes[1] << 16 | bytes[2] << 8 | bytes[3], 32); } |
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function packIEEE754(v, ebits, fbits) { |
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var bias = (1 << (ebits - 1)) - 1, |
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s, e, f, ln, |
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i, bits, str, bytes; |
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function roundToEven(n) { |
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var w = floor(n), f = n - w; |
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if (f < 0.5) |
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return w; |
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if (f > 0.5) |
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return w + 1; |
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return w % 2 ? w + 1 : w; |
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} |
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// Compute sign, exponent, fraction |
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if (v !== v) { |
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// NaN |
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// http://dev.w3.org/2006/webapi/WebIDL/#es-type-mapping |
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e = (1 << ebits) - 1; f = pow(2, fbits - 1); s = 0; |
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} else if (v === Infinity || v === -Infinity) { |
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e = (1 << ebits) - 1; f = 0; s = (v < 0) ? 1 : 0; |
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} else if (v === 0) { |
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e = 0; f = 0; s = (1 / v === -Infinity) ? 1 : 0; |
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} else { |
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s = v < 0; |
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v = abs(v); |
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if (v >= pow(2, 1 - bias)) { |
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e = min(floor(log(v) / LN2), 1023); |
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f = roundToEven(v / pow(2, e) * pow(2, fbits)); |
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if (f / pow(2, fbits) >= 2) { |
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e = e + 1; |
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f = 1; |
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} |
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if (e > bias) { |
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// Overflow |
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e = (1 << ebits) - 1; |
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f = 0; |
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} else { |
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// Normalized |
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e = e + bias; |
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f = f - pow(2, fbits); |
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} |
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} else { |
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// Denormalized |
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e = 0; |
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f = roundToEven(v / pow(2, 1 - bias - fbits)); |
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} |
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} |
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// Pack sign, exponent, fraction |
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bits = []; |
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for (i = fbits; i; i -= 1) { bits.push(f % 2 ? 1 : 0); f = floor(f / 2); } |
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for (i = ebits; i; i -= 1) { bits.push(e % 2 ? 1 : 0); e = floor(e / 2); } |
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bits.push(s ? 1 : 0); |
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bits.reverse(); |
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str = bits.join(''); |
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// Bits to bytes |
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bytes = []; |
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while (str.length) { |
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bytes.push(parseInt(str.substring(0, 8), 2)); |
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str = str.substring(8); |
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} |
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return bytes; |
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} |
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function unpackIEEE754(bytes, ebits, fbits) { |
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// Bytes to bits |
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var bits = [], i, j, b, str, |
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bias, s, e, f; |
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for (i = bytes.length; i; i -= 1) { |
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b = bytes[i - 1]; |
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for (j = 8; j; j -= 1) { |
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bits.push(b % 2 ? 1 : 0); b = b >> 1; |
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} |
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} |
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bits.reverse(); |
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str = bits.join(''); |
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// Unpack sign, exponent, fraction |
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bias = (1 << (ebits - 1)) - 1; |
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s = parseInt(str.substring(0, 1), 2) ? -1 : 1; |
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e = parseInt(str.substring(1, 1 + ebits), 2); |
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f = parseInt(str.substring(1 + ebits), 2); |
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// Produce number |
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if (e === (1 << ebits) - 1) { |
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return f !== 0 ? NaN : s * Infinity; |
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} else if (e > 0) { |
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// Normalized |
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return s * pow(2, e - bias) * (1 + f / pow(2, fbits)); |
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} else if (f !== 0) { |
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// Denormalized |
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return s * pow(2, -(bias - 1)) * (f / pow(2, fbits)); |
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} else { |
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return s < 0 ? -0 : 0; |
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} |
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} |
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function unpackF64(b) { return unpackIEEE754(b, 11, 52); } |
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function packF64(v) { return packIEEE754(v, 11, 52); } |
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function unpackF32(b) { return unpackIEEE754(b, 8, 23); } |
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function packF32(v) { return packIEEE754(v, 8, 23); } |
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// |
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// 3 The ArrayBuffer Type |
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// |
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(function() { |
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/** @constructor */ |
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var ArrayBuffer = function ArrayBuffer(length) { |
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length = ECMAScript.ToInt32(length); |
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if (length < 0) throw new RangeError('ArrayBuffer size is not a small enough positive integer'); |
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this.byteLength = length; |
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this._bytes = []; |
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this._bytes.length = length; |
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var i; |
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for (i = 0; i < this.byteLength; i += 1) { |
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this._bytes[i] = 0; |
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} |
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configureProperties(this); |
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}; |
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exports.ArrayBuffer = exports.ArrayBuffer || ArrayBuffer; |
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// |
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// 4 The ArrayBufferView Type |
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// |
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// NOTE: this constructor is not exported |
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/** @constructor */ |
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var ArrayBufferView = function ArrayBufferView() { |
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//this.buffer = null; |
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//this.byteOffset = 0; |
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//this.byteLength = 0; |
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}; |
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// |
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// 5 The Typed Array View Types |
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// |
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function makeConstructor(bytesPerElement, pack, unpack) { |
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// Each TypedArray type requires a distinct constructor instance with |
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// identical logic, which this produces. |
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var ctor; |
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ctor = function(buffer, byteOffset, length) { |
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var array, sequence, i, s; |
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if (!arguments.length || typeof arguments[0] === 'number') { |
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// Constructor(unsigned long length) |
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this.length = ECMAScript.ToInt32(arguments[0]); |
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if (length < 0) throw new RangeError('ArrayBufferView size is not a small enough positive integer'); |
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this.byteLength = this.length * this.BYTES_PER_ELEMENT; |
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this.buffer = new ArrayBuffer(this.byteLength); |
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this.byteOffset = 0; |
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} else if (typeof arguments[0] === 'object' && arguments[0].constructor === ctor) { |
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// Constructor(TypedArray array) |
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array = arguments[0]; |
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this.length = array.length; |
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this.byteLength = this.length * this.BYTES_PER_ELEMENT; |
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this.buffer = new ArrayBuffer(this.byteLength); |
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this.byteOffset = 0; |
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for (i = 0; i < this.length; i += 1) { |
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this._setter(i, array._getter(i)); |
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} |
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} else if (typeof arguments[0] === 'object' && |
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!(arguments[0] instanceof ArrayBuffer || ECMAScript.Class(arguments[0]) === 'ArrayBuffer')) { |
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// Constructor(sequence<type> array) |
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sequence = arguments[0]; |
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this.length = ECMAScript.ToUint32(sequence.length); |
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this.byteLength = this.length * this.BYTES_PER_ELEMENT; |
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this.buffer = new ArrayBuffer(this.byteLength); |
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this.byteOffset = 0; |
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for (i = 0; i < this.length; i += 1) { |
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s = sequence[i]; |
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this._setter(i, Number(s)); |
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} |
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} else if (typeof arguments[0] === 'object' && |
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(arguments[0] instanceof ArrayBuffer || ECMAScript.Class(arguments[0]) === 'ArrayBuffer')) { |
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// Constructor(ArrayBuffer buffer, |
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// optional unsigned long byteOffset, optional unsigned long length) |
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this.buffer = buffer; |
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this.byteOffset = ECMAScript.ToUint32(byteOffset); |
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if (this.byteOffset > this.buffer.byteLength) { |
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throw new RangeError("byteOffset out of range"); |
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} |
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if (this.byteOffset % this.BYTES_PER_ELEMENT) { |
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// The given byteOffset must be a multiple of the element |
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// size of the specific type, otherwise an exception is raised. |
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throw new RangeError("ArrayBuffer length minus the byteOffset is not a multiple of the element size."); |
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} |
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if (arguments.length < 3) { |
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this.byteLength = this.buffer.byteLength - this.byteOffset; |
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if (this.byteLength % this.BYTES_PER_ELEMENT) { |
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throw new RangeError("length of buffer minus byteOffset not a multiple of the element size"); |
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} |
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this.length = this.byteLength / this.BYTES_PER_ELEMENT; |
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} else { |
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this.length = ECMAScript.ToUint32(length); |
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this.byteLength = this.length * this.BYTES_PER_ELEMENT; |
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} |
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if ((this.byteOffset + this.byteLength) > this.buffer.byteLength) { |
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throw new RangeError("byteOffset and length reference an area beyond the end of the buffer"); |
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} |
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} else { |
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throw new TypeError("Unexpected argument type(s)"); |
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} |
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this.constructor = ctor; |
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configureProperties(this); |
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makeArrayAccessors(this); |
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}; |
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ctor.prototype = new ArrayBufferView(); |
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ctor.prototype.BYTES_PER_ELEMENT = bytesPerElement; |
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ctor.prototype._pack = pack; |
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ctor.prototype._unpack = unpack; |
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ctor.BYTES_PER_ELEMENT = bytesPerElement; |
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// getter type (unsigned long index); |
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ctor.prototype._getter = function(index) { |
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if (arguments.length < 1) throw new SyntaxError("Not enough arguments"); |
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index = ECMAScript.ToUint32(index); |
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if (index >= this.length) { |
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return undefined; |
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} |
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var bytes = [], i, o; |
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for (i = 0, o = this.byteOffset + index * this.BYTES_PER_ELEMENT; |
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i < this.BYTES_PER_ELEMENT; |
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i += 1, o += 1) { |
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bytes.push(this.buffer._bytes[o]); |
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} |
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return this._unpack(bytes); |
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}; |
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// NONSTANDARD: convenience alias for getter: type get(unsigned long index); |
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ctor.prototype.get = ctor.prototype._getter; |
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// setter void (unsigned long index, type value); |
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ctor.prototype._setter = function(index, value) { |
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if (arguments.length < 2) throw new SyntaxError("Not enough arguments"); |
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index = ECMAScript.ToUint32(index); |
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if (index >= this.length) { |
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return undefined; |
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} |
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var bytes = this._pack(value), i, o; |
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for (i = 0, o = this.byteOffset + index * this.BYTES_PER_ELEMENT; |
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i < this.BYTES_PER_ELEMENT; |
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i += 1, o += 1) { |
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this.buffer._bytes[o] = bytes[i]; |
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} |
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}; |
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// void set(TypedArray array, optional unsigned long offset); |
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// void set(sequence<type> array, optional unsigned long offset); |
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ctor.prototype.set = function(index, value) { |
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if (arguments.length < 1) throw new SyntaxError("Not enough arguments"); |
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var array, sequence, offset, len, |
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i, s, d, |
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byteOffset, byteLength, tmp; |
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if (typeof arguments[0] === 'object' && arguments[0].constructor === this.constructor) { |
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// void set(TypedArray array, optional unsigned long offset); |
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array = arguments[0]; |
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offset = ECMAScript.ToUint32(arguments[1]); |
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if (offset + array.length > this.length) { |
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throw new RangeError("Offset plus length of array is out of range"); |
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} |
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byteOffset = this.byteOffset + offset * this.BYTES_PER_ELEMENT; |
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byteLength = array.length * this.BYTES_PER_ELEMENT; |
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if (array.buffer === this.buffer) { |
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tmp = []; |
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for (i = 0, s = array.byteOffset; i < byteLength; i += 1, s += 1) { |
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tmp[i] = array.buffer._bytes[s]; |
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} |
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for (i = 0, d = byteOffset; i < byteLength; i += 1, d += 1) { |
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this.buffer._bytes[d] = tmp[i]; |
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} |
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} else { |
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for (i = 0, s = array.byteOffset, d = byteOffset; |
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i < byteLength; i += 1, s += 1, d += 1) { |
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this.buffer._bytes[d] = array.buffer._bytes[s]; |
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} |
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} |
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} else if (typeof arguments[0] === 'object' && typeof arguments[0].length !== 'undefined') { |
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// void set(sequence<type> array, optional unsigned long offset); |
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sequence = arguments[0]; |
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len = ECMAScript.ToUint32(sequence.length); |
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offset = ECMAScript.ToUint32(arguments[1]); |
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if (offset + len > this.length) { |
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throw new RangeError("Offset plus length of array is out of range"); |
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} |
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for (i = 0; i < len; i += 1) { |
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s = sequence[i]; |
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this._setter(offset + i, Number(s)); |
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} |
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} else { |
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throw new TypeError("Unexpected argument type(s)"); |
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} |
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}; |
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// TypedArray subarray(long begin, optional long end); |
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ctor.prototype.subarray = function(start, end) { |
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function clamp(v, min, max) { return v < min ? min : v > max ? max : v; } |
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start = ECMAScript.ToInt32(start); |
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end = ECMAScript.ToInt32(end); |
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if (arguments.length < 1) { start = 0; } |
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if (arguments.length < 2) { end = this.length; } |
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if (start < 0) { start = this.length + start; } |
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if (end < 0) { end = this.length + end; } |
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start = clamp(start, 0, this.length); |
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end = clamp(end, 0, this.length); |
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var len = end - start; |
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if (len < 0) { |
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len = 0; |
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} |
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return new this.constructor( |
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this.buffer, this.byteOffset + start * this.BYTES_PER_ELEMENT, len); |
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}; |
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return ctor; |
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} |
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var Int8Array = makeConstructor(1, packI8, unpackI8); |
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var Uint8Array = makeConstructor(1, packU8, unpackU8); |
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var Uint8ClampedArray = makeConstructor(1, packU8Clamped, unpackU8); |
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var Int16Array = makeConstructor(2, packI16, unpackI16); |
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var Uint16Array = makeConstructor(2, packU16, unpackU16); |
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var Int32Array = makeConstructor(4, packI32, unpackI32); |
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var Uint32Array = makeConstructor(4, packU32, unpackU32); |
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var Float32Array = makeConstructor(4, packF32, unpackF32); |
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var Float64Array = makeConstructor(8, packF64, unpackF64); |
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exports.Int8Array = exports.Int8Array || Int8Array; |
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exports.Uint8Array = exports.Uint8Array || Uint8Array; |
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exports.Uint8ClampedArray = exports.Uint8ClampedArray || Uint8ClampedArray; |
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exports.Int16Array = exports.Int16Array || Int16Array; |
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exports.Uint16Array = exports.Uint16Array || Uint16Array; |
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exports.Int32Array = exports.Int32Array || Int32Array; |
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exports.Uint32Array = exports.Uint32Array || Uint32Array; |
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exports.Float32Array = exports.Float32Array || Float32Array; |
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exports.Float64Array = exports.Float64Array || Float64Array; |
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}()); |
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// |
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// 6 The DataView View Type |
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// |
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(function() { |
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function r(array, index) { |
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return ECMAScript.IsCallable(array.get) ? array.get(index) : array[index]; |
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} |
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var IS_BIG_ENDIAN = (function() { |
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var u16array = new(exports.Uint16Array)([0x1234]), |
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u8array = new(exports.Uint8Array)(u16array.buffer); |
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return r(u8array, 0) === 0x12; |
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}()); |
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// Constructor(ArrayBuffer buffer, |
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// optional unsigned long byteOffset, |
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// optional unsigned long byteLength) |
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/** @constructor */ |
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var DataView = function DataView(buffer, byteOffset, byteLength) { |
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if (arguments.length === 0) { |
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buffer = new exports.ArrayBuffer(0); |
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} else if (!(buffer instanceof exports.ArrayBuffer || ECMAScript.Class(buffer) === 'ArrayBuffer')) { |
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throw new TypeError("TypeError"); |
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} |
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this.buffer = buffer || new exports.ArrayBuffer(0); |
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this.byteOffset = ECMAScript.ToUint32(byteOffset); |
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if (this.byteOffset > this.buffer.byteLength) { |
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throw new RangeError("byteOffset out of range"); |
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} |
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if (arguments.length < 3) { |
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this.byteLength = this.buffer.byteLength - this.byteOffset; |
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} else { |
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this.byteLength = ECMAScript.ToUint32(byteLength); |
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} |
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if ((this.byteOffset + this.byteLength) > this.buffer.byteLength) { |
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throw new RangeError("byteOffset and length reference an area beyond the end of the buffer"); |
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} |
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configureProperties(this); |
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}; |
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function makeGetter(arrayType) { |
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return function(byteOffset, littleEndian) { |
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byteOffset = ECMAScript.ToUint32(byteOffset); |
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if (byteOffset + arrayType.BYTES_PER_ELEMENT > this.byteLength) { |
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throw new RangeError("Array index out of range"); |
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} |
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byteOffset += this.byteOffset; |
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var uint8Array = new exports.Uint8Array(this.buffer, byteOffset, arrayType.BYTES_PER_ELEMENT), |
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bytes = [], i; |
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for (i = 0; i < arrayType.BYTES_PER_ELEMENT; i += 1) { |
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bytes.push(r(uint8Array, i)); |
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} |
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if (Boolean(littleEndian) === Boolean(IS_BIG_ENDIAN)) { |
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bytes.reverse(); |
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} |
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return r(new arrayType(new exports.Uint8Array(bytes).buffer), 0); |
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}; |
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} |
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DataView.prototype.getUint8 = makeGetter(exports.Uint8Array); |
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DataView.prototype.getInt8 = makeGetter(exports.Int8Array); |
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DataView.prototype.getUint16 = makeGetter(exports.Uint16Array); |
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DataView.prototype.getInt16 = makeGetter(exports.Int16Array); |
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DataView.prototype.getUint32 = makeGetter(exports.Uint32Array); |
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DataView.prototype.getInt32 = makeGetter(exports.Int32Array); |
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DataView.prototype.getFloat32 = makeGetter(exports.Float32Array); |
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DataView.prototype.getFloat64 = makeGetter(exports.Float64Array); |
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function makeSetter(arrayType) { |
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return function(byteOffset, value, littleEndian) { |
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byteOffset = ECMAScript.ToUint32(byteOffset); |
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if (byteOffset + arrayType.BYTES_PER_ELEMENT > this.byteLength) { |
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throw new RangeError("Array index out of range"); |
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} |
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// Get bytes |
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var typeArray = new arrayType([value]), |
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byteArray = new exports.Uint8Array(typeArray.buffer), |
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bytes = [], i, byteView; |
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for (i = 0; i < arrayType.BYTES_PER_ELEMENT; i += 1) { |
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bytes.push(r(byteArray, i)); |
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} |
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// Flip if necessary |
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if (Boolean(littleEndian) === Boolean(IS_BIG_ENDIAN)) { |
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bytes.reverse(); |
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} |
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// Write them |
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byteView = new exports.Uint8Array(this.buffer, byteOffset, arrayType.BYTES_PER_ELEMENT); |
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byteView.set(bytes); |
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}; |
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} |
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DataView.prototype.setUint8 = makeSetter(exports.Uint8Array); |
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DataView.prototype.setInt8 = makeSetter(exports.Int8Array); |
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DataView.prototype.setUint16 = makeSetter(exports.Uint16Array); |
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DataView.prototype.setInt16 = makeSetter(exports.Int16Array); |
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DataView.prototype.setUint32 = makeSetter(exports.Uint32Array); |
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DataView.prototype.setInt32 = makeSetter(exports.Int32Array); |
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DataView.prototype.setFloat32 = makeSetter(exports.Float32Array); |
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DataView.prototype.setFloat64 = makeSetter(exports.Float64Array); |
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exports.DataView = exports.DataView || DataView; |
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}());
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