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