mirror of
https://github.com/photonstorm/phaser
synced 2024-11-27 23:20:59 +00:00
460 lines
No EOL
13 KiB
JavaScript
460 lines
No EOL
13 KiB
JavaScript
/*
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* By Benvie https://gist.github.com/Benvie/5020656
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*/
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void function(global){
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if ('DataView' in global && 'ArrayBuffer' in global) {
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return;
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}
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var hide = (function(){
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// check if we're in ES5
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if (typeof Object.getOwnPropertyNames === 'function' && !('prototype' in Object.getOwnPropertyNames)) {
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var hidden = { enumerable: false };
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return function(object, key){
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Object.defineProperty(object, key, hidden);
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};
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}
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// noop for ES3
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return function(){};
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})();
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function define(object, props){
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for (var key in props) {
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object[key] = props[key];
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}
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}
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var ArrayBuffer = global.ArrayBuffer = (function(){
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var min = Math.min,
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max = Math.max,
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char = String.fromCharCode;
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var chars = {},
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indices = [];
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// create cached mapping of characters to char codes and back
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void function(){
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for (var i = 0; i < 0x100; ++i) {
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chars[indices[i] = char(i)] = i;
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if (i >= 0x80) {
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chars[char(0xf700 + i)] = i;
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}
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}
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}();
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// read a string into an array of bytes
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function readString(string){
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var array = [],
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cycles = string.length % 8,
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index = 0;
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while (cycles--) {
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array[index] = chars[string[index++]];
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}
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cycles = string.length >> 3;
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while (cycles--) {
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array.push(
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chars[string[index]],
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chars[string[index+1]],
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chars[string[index+2]],
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chars[string[index+3]],
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chars[string[index+4]],
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chars[string[index+5]],
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chars[string[index+6]],
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chars[string[index+7]]
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);
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index += 8;
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}
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return array;
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}
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// write an array of bytes to a string
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function writeString(array){
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try { return char.apply(null, array) } catch (e) {}
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var string = '',
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cycles = array.length % 8,
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index = 0;
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while (cycles--) {
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string += indices[array[index++]];
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}
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cycles = array.length >> 3;
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while (cycles--) {
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string +=
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indices[array[index]] +
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indices[array[index+1]] +
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indices[array[index+2]] +
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indices[array[index+3]] +
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indices[array[index+4]] +
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indices[array[index+5]] +
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indices[array[index+6]] +
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indices[array[index+7]];
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index += 8;
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}
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return string;
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}
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// create a new array of given size where each element is 0
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function zerodArray(size){
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var data = new Array(size);
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for (var i=0; i < size; i++) {
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data[i] = 0;
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}
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return data;
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}
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// ###################
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// ### ArrayBuffer ###
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// ###################
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function ArrayBuffer(length){
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if (length instanceof ArrayBuffer) {
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this._data = length._data.slice();
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} else if (typeof length === 'string') {
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this._data = readString(length);
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} else {
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if ((length >>= 0) < 0) {
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throw new RangeError('ArrayBuffer length must be non-negative');
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}
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this._data = zerodArray(length);
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}
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this.byteLength = this._data.length;
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hide(this, '_data');
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}
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define(ArrayBuffer, {
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toByteString: function toByteString(arraybuffer){
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if (!(arraybuffer instanceof ArrayBuffer)) {
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throw new TypeError('ArrayBuffer.toByteString requires an ArrayBuffer');
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}
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return writeString(arraybuffer._data);
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}
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});
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define(ArrayBuffer.prototype, {
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slice: function slice(begin, end){
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var arraybuffer = new ArrayBuffer(0);
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arraybuffer._data = this._data.slice(begin, end);
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arraybuffer.byteLength = arraybuffer._data.length;
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return arraybuffer;
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}
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});
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return ArrayBuffer;
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})();
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global.DataView = (function(){
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var log = Math.log,
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pow = Math.pow,
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LN2 = Math.LN2;
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// Joyent copyright applies to readFloat and writeFloat
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// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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function readFloat(dataview, offset, littleEndian, mLen, bytes){
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var buffer = dataview.buffer._data,
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offset = dataview.byteOffset + offset,
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e, m,
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eLen = bytes * 8 - mLen - 1,
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eMax = (1 << eLen) - 1,
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eBias = eMax >> 1,
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nBits = -7,
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i = littleEndian ? bytes - 1 : 0 ,
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d = littleEndian ? -1 : 1,
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s = buffer[offset + i];
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i += d;
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e = s & ((1 << (-nBits)) - 1);
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s >>= (-nBits);
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nBits += eLen;
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for (; nBits > 0; e = e * 0x100 + buffer[offset + i], i += d, nBits -= 8);
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m = e & ((1 << (-nBits)) - 1);
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e >>= (-nBits);
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nBits += mLen;
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for (; nBits > 0; m = m * 0x100 + buffer[offset + i], i += d, nBits -= 8);
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if (e === 0) {
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e = 1 - eBias;
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} else if (e === eMax) {
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return m ? NaN : s ? -Infinity : Infinity;
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} else {
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m = m + pow(2, mLen);
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e = e - eBias;
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}
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return (s ? -1 : 1) * m * pow(2, e - mLen);
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}
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function writeFloat(dataview, offset, value, littleEndian, mLen, bytes){
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var buffer = dataview.buffer._data,
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offset = dataview.byteOffset + offset,
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e, m, c,
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eLen = bytes * 8 - mLen - 1,
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eMax = (1 << eLen) - 1,
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eBias = eMax >> 1,
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rt = (mLen === 23 ? pow(2, -24) - pow(2, -77) : 0),
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i = littleEndian ? 0 : bytes - 1,
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d = littleEndian ? 1 : -1,
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s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;
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value < 0 && (value = -value);
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if (value !== value || value === Infinity) {
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m = value !== value ? 1 : 0;
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e = eMax;
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} else {
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e = (log(value) / LN2) | 0;
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if (value * (c = pow(2, -e)) < 1) {
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e--;
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c *= 2;
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}
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if (e + eBias >= 1) {
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value += rt / c;
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} else {
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value += rt * pow(2, 1 - eBias);
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}
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if (value * c >= 2) {
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e++;
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c /= 2;
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}
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if (e + eBias >= eMax) {
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m = 0;
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e = eMax;
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} else if (e + eBias >= 1) {
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m = (value * c - 1) * pow(2, mLen);
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e = e + eBias;
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} else {
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m = value * pow(2, eBias - 1) * pow(2, mLen);
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e = 0;
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}
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}
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for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 0x100, mLen -= 8);
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e = (e << mLen) | m;
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eLen += mLen;
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for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 0x100, eLen -= 8);
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buffer[offset + i - d] |= s * 0x80;
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}
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var le2 = [1, 0],
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le4 = [3, 2, 1, 0],
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be2 = [0, 1],
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be4 = [0, 1, 2, 3];
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function readUint8(dataview, byteOffset){
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var buffer = dataview.buffer._data,
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offset = byteOffset + dataview.byteOffset;
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return buffer[offset];
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}
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function readUint16(dataview, byteOffset, littleEndian){
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var buffer = dataview.buffer._data,
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offset = byteOffset + dataview.byteOffset,
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order = littleEndian ? le2 : be2;
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var b0 = buffer[offset + order[0]],
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b1 = buffer[offset + order[1]] << 8;
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return b0 | b1;
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}
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function readUint32(dataview, byteOffset, littleEndian){
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var buffer = dataview.buffer._data,
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offset = byteOffset + dataview.byteOffset,
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order = littleEndian ? le4 : be4;
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var b0 = buffer[offset + order[0]],
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b1 = buffer[offset + order[1]] << 8,
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b2 = buffer[offset + order[2]] << 16,
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b3 = buffer[offset + order[3]] << 24;
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return b0 | b1 | b2 | b3;
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}
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function boundsCheck(offset, size, max){
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if (offset < 0) {
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throw new RangeError('Tried to write to a negative index');
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} else if (offset + size > max) {
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throw new RangeError('Tried to write '+size+' bytes past the end of a buffer at index '+offset+' of '+max);
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}
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}
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function writeUint8(dataview, byteOffset, value){
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var buffer = dataview.buffer._data,
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offset = byteOffset + dataview.byteOffset;
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boundsCheck(offset, 1, buffer.length);
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buffer[offset] = value & 0xff;
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}
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function writeUint16(dataview, byteOffset, value, littleEndian){
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var buffer = dataview.buffer._data,
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order = littleEndian ? le2 : be2,
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offset = byteOffset + dataview.byteOffset;
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boundsCheck(offset, 2, buffer.length);
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buffer[offset + order[0]] = value & 0xff;
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buffer[offset + order[1]] = value >>> 8 & 0xff;
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}
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function writeUint32(dataview, byteOffset, value, littleEndian){
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var buffer = dataview.buffer._data,
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order = littleEndian ? le4 : be4,
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offset = byteOffset + dataview.byteOffset;
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boundsCheck(offset, 4, buffer.length);
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buffer[offset + order[0]] = value & 0xff;
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buffer[offset + order[1]] = value >>> 8 & 0xff;
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buffer[offset + order[2]] = value >>> 16 & 0xff;
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buffer[offset + order[3]] = value >>> 24 & 0xff;
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}
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// ################
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// ### DataView ###
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// ################
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function DataView(buffer, byteOffset, byteLength){
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if (!(buffer instanceof ArrayBuffer)) {
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throw new TypeError('DataView must be initialized with an ArrayBuffer');
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}
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if (byteOffset === undefined) {
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this.byteOffset = buffer.byteOffset >> 0;
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} else {
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this.byteOffset = byteOffset >> 0;
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}
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if (this.byteOffset < 0) {
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throw new RangeError('DataView byteOffset must be non-negative');
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}
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if (byteLength === undefined) {
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this.byteLength = (buffer.byteLength - this.byteOffset) >> 0;
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} else {
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this.byteLength = byteLength >> 0;
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}
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if (this.byteLength < 0) {
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throw new RangeError('DataView byteLength must be non-negative');
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}
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if (this.byteOffset + this.byteLength > buffer.byteLength) {
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throw new RangeError('DataView byteOffset and byteLength greater than ArrayBuffer byteLength');
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}
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this.buffer = buffer;
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}
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define(DataView.prototype, {
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getFloat32: function getFloat32(byteOffset, littleEndian){
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return readFloat(this, byteOffset, littleEndian, 23, 4);
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},
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getFloat64: function getFloat64(byteOffset, littleEndian){
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return readFloat(this, byteOffset, littleEndian, 52, 8);
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},
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getInt8: function getInt8(byteOffset){
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var n = readUint8(this, byteOffset);
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return n & 0x80 ? n ^ -0x100 : n;
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},
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getInt16: function getInt16(byteOffset, littleEndian){
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var n = readUint16(this, byteOffset, littleEndian);
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return n & 0x8000 ? n ^ -0x10000 : n;
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},
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getInt32: function getInt32(byteOffset, littleEndian){
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var n = readUint32(this, byteOffset, littleEndian);
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return n & 0x80000000 ? n ^ -0x100000000 : n;
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},
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getUint8: function getUint8(byteOffset){
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return readUint8(this, byteOffset);
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},
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getUint16: function getUint16(byteOffset, littleEndian){
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return readUint16(this, byteOffset, littleEndian);
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},
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getUint32: function getUint32(byteOffset, littleEndian){
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return readUint32(this, byteOffset, littleEndian);
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},
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setFloat32: function setFloat32(byteOffset, value, littleEndian){
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writeFloat(this, byteOffset, value, littleEndian, 23, 4);
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},
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setFloat64: function setFloat64(byteOffset, value, littleEndian){
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writeFloat(this, byteOffset, value, littleEndian, 52, 8);
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},
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setInt8: function setInt8(byteOffset, value){
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writeUint8(this, byteOffset, value < 0 ? value | 0x100 : value);
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},
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setInt16: function setInt16(byteOffset, value, littleEndian){
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writeUint16(this, byteOffset, value < 0 ? value | 0x10000 : value, littleEndian);
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},
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setInt32: function setInt32(byteOffset, value, littleEndian){
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writeUint32(this, byteOffset, value < 0 ? value | 0x100000000 : value, littleEndian);
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},
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setUint8: function setUint8(byteOffset, value){
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writeUint8(this, byteOffset, value);
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},
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setUint16: function setUint16(byteOffset, value, littleEndian){
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writeUint16(this, byteOffset, value, littleEndian);
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},
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setUint32: function setUint32(byteOffset, value, littleEndian){
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writeUint32(this, byteOffset, value, littleEndian);
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}
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});
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return DataView;
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})();
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}((0,eval)('this')); |