File: connected-users-websocket/node_modules/socket.io/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/util/Base64.as

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File: connected-users-websocket/node_modules/socket.io/node_modules/socket.io-client/lib/vendor/web-socket-js/flash-src/com/hurlant/util/Base64.as
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/* Base64 library for ActionScript 3.0. * Based on: Ma Bingyao code. * Optimized by: Jean-Philippe Auclair / jpauclair.wordpress.com * Copyright (C) 2007 Ma Bingyao <andot@ujn.edu.cn> * LastModified: Oct 26, 2009 * This library is free. You can redistribute it and/or modify it. */ package com.hurlant.util{ import flash.utils.ByteArray; public class Base64 { private static const _encodeChars : Vector.<int> = InitEncoreChar(); private static const _decodeChars : Vector.<int> = InitDecodeChar(); public static function encodeByteArray(data : ByteArray) : String { var out : ByteArray = new ByteArray(); //Presetting the length keep the memory smaller and optimize speed since there is no "grow" needed out.length = (2 + data.length - ((data.length + 2) % 3)) * 4 / 3; //Preset length //1.6 to 1.5 ms var i : int = 0; var r : int = data.length % 3; var len : int = data.length - r; var c : int; //read (3) character AND write (4) characters while (i < len) { //Read 3 Characters (8bit * 3 = 24 bits) c = data[i++] << 16 | data[i++] << 8 | data[i++]; //Cannot optimize this to read int because of the positioning overhead. (as3 bytearray seek is slow) //Convert to 4 Characters (6 bit * 4 = 24 bits) c = (_encodeChars[c >>> 18] << 24) | (_encodeChars[c >>> 12 & 0x3f] << 16) | (_encodeChars[c >>> 6 & 0x3f] << 8) | _encodeChars[c & 0x3f]; //Optimization: On older and slower computer, do one write Int instead of 4 write byte: 1.5 to 0.71 ms out.writeInt(c); /* out.writeByte(_encodeChars[c >> 18] ); out.writeByte(_encodeChars[c >> 12 & 0x3f]); out.writeByte(_encodeChars[c >> 6 & 0x3f]); out.writeByte(_encodeChars[c & 0x3f]); */ } if (r == 1) //Need two "=" padding { //Read one char, write two chars, write padding c = data[i]; c = (_encodeChars[c >>> 2] << 24) | (_encodeChars[(c & 0x03) << 4] << 16) | 61 << 8 | 61; out.writeInt(c); } else if (r == 2) //Need one "=" padding { c = data[i++] << 8 | data[i]; c = (_encodeChars[c >>> 10] << 24) | (_encodeChars[c >>> 4 & 0x3f] << 16) | (_encodeChars[(c & 0x0f) << 2] << 8) | 61; out.writeInt(c); } out.position = 0; return out.readUTFBytes(out.length); } public static function decodeToByteArray(str : String) : ByteArray { var c1 : int; var c2 : int; var c3 : int; var c4 : int; var i : int; var len : int; var out : ByteArray; len = str.length; i = 0; out = new ByteArray(); var byteString : ByteArray = new ByteArray(); byteString.writeUTFBytes(str); while (i < len) { //c1 do { c1 = _decodeChars[byteString[i++]]; } while (i < len && c1 == -1); if (c1 == -1) break; //c2 do { c2 = _decodeChars[byteString[i++]]; } while (i < len && c2 == -1); if (c2 == -1) break; out.writeByte((c1 << 2) | ((c2 & 0x30) >> 4)); //c3 do { c3 = byteString[i++]; if (c3 == 61) return out; c3 = _decodeChars[c3]; } while (i < len && c3 == -1); if (c3 == -1) break; out.writeByte(((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2)); //c4 do { c4 = byteString[i++]; if (c4 == 61) return out; c4 = _decodeChars[c4]; } while (i < len && c4 == -1); if (c4 == -1) break; out.writeByte(((c3 & 0x03) << 6) | c4); } out.position = 0; return out; } public static function encode(data : String) : String { // Convert string to ByteArray var bytes : ByteArray = new ByteArray(); bytes.writeUTFBytes(data); // Return encoded ByteArray return encodeByteArray(bytes); } public static function decode(data : String) : String { // Decode data to ByteArray var bytes : ByteArray = decodeToByteArray(data); // Convert to string and return return bytes.readUTFBytes(bytes.length); } public static function InitEncoreChar() : Vector.<int> { var encodeChars : Vector.<int> = new Vector.<int>(); // We could push the number directly, but i think it's nice to see the characters (with no overhead on encode/decode) var chars : String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; for (var i : int = 0; i < 64; i++) { encodeChars.push(chars.charCodeAt(i)); } /* encodeChars.push( 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 43, 47); */ return encodeChars; } public static function InitDecodeChar() : Vector.<int> { var decodeChars : Vector.<int> = new Vector.<int>(); decodeChars.push(-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 - 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1); return decodeChars; } } }