/**********************************************************\
| |
| The implementation of PHPRPC Protocol 3.0 |
| |
| Base64.as |
| |
| Release 3.0.0 |
| Copyright (c) 2005-2007 by Team-PHPRPC |
| |
| WebSite: http://www.phprpc.org/ |
| http://www.phprpc.net/ |
| http://www.phprpc.com/ |
| http://sourceforge.net/projects/php-rpc/ |
| |
| Authors: Ma Bingyao <[email protected]> |
| |
| This file may be distributed and/or modified under the |
| terms of the GNU Lesser General Public License (LGPL) |
| version 3.0 as published by the Free Software Foundation |
| and appearing in the included file LICENSE. |
| |
\**********************************************************/
/* Base64 library for ActionScript 3.0.
*
* Copyright (C) 2007 Ma Bingyao <[email protected]>
* Version: 1.1
* LastModified: Oct 26, 2007
* This library is free. You can redistribute it and/or modify it.
*/
/*
* interfaces:
* import org.phprpc.util.Base64;
* import flash.utils.ByteArray;
* var data:ByteArray = new ByteArray();
* data.writeUTFBytes("Hello PHPRPC");
* var b64:String = Base64.encode(data);
* trace(b64);
* trace(Base64.decode(b64));
*/
package org.phprpc.util{
import flash.utils.ByteArray;
public class Base64 {
private static const encodeChars:Array =
['A','B','C','D','E','F','G','H',
'I','J','K','L','M','N','O','P',
'Q','R','S','T','U','V','W','X',
'Y','Z','a','b','c','d','e','f',
'g','h','i','j','k','l','m','n',
'o','p','q','r','s','t','u','v',
'w','x','y','z','0','1','2','3',
'4','5','6','7','8','9','+','/'];
private static const decodeChars:Array =
[-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];
public static function encode(data:ByteArray):String {
var out:Array = [];
var i:int = 0;
var j:int = 0;
var r:int = data.length % 3;
var len:int = data.length - r;
var c:int;
while (i < len) {
c = data[i++] << 16 | data[i++] << 8 | data[i++];
out[j++] = encodeChars[c >> 18] + encodeChars[c >> 12 & 0x3f] + encodeChars[c >> 6 & 0x3f] + encodeChars[c & 0x3f];
}
if (r == 1) {
c = data[i++];
out[j++] = encodeChars[c >> 2] + encodeChars[(c & 0x03) << 4] + "==";
}
else if (r == 2) {
c = data[i++] << 8 | data[i++];
out[j++] = encodeChars[c >> 10] + encodeChars[c >> 4 & 0x3f] + encodeChars[(c & 0x0f) << 2] + "=";
}
return out.join('');
}
public static function decode(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();
while (i < len) {
// c1
do {
c1 = decodeChars[str.charCodeAt(i++) & 0xff];
} while (i < len && c1 == -1);
if (c1 == -1) {
break;
}
// c2
do {
c2 = decodeChars[str.charCodeAt(i++) & 0xff];
} while (i < len && c2 == -1);
if (c2 == -1) {
break;
}
out.writeByte((c1 << 2) | ((c2 & 0x30) >> 4));
// c3
do {
c3 = str.charCodeAt(i++) & 0xff;
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 = str.charCodeAt(i++) & 0xff;
if (c4 == 61) {
return out;
}
c4 = decodeChars[c4];
} while (i < len && c4 == -1);
if (c4 == -1) {
break;
}
out.writeByte(((c3 & 0x03) << 6) | c4);
}
return out;
}
}
}
