as3.0 & JAVA & JS 64位编码与解码

64位编码  其是PHPRPC工程的一部分 PHPRPC 就是我们常用的RPC（ Remote Procedure Calling ） 它非常安全高效：

下面是各个版本的代码：



AS3.0版





/**********************************************************/
|                                                          |
| 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));
*/
/*

用于64位编码：其作用是使信息高效安全的传输


*/

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;
  }
}
}











JS版本：





     

<html>

  <head>

     <title>base64 Encoding/Decoding</title>

  </head>



  <script type="text/javascript">

  <!--



  var keyStr = "ABCDEFGHIJKLMNOP" +

               "QRSTUVWXYZabcdef" +

               "ghijklmnopqrstuv" +

               "wxyz0123456789+/" +

               "=";



  function encode64(input) {

     input = escape(input);

     var output = "";

     var chr1, chr2, chr3 = "";

     var enc1, enc2, enc3, enc4 = "";

     var i = 0;



     do {

        chr1 = input.charCodeAt(i++);

        chr2 = input.charCodeAt(i++);

        chr3 = input.charCodeAt(i++);



        enc1 = chr1 >> 2;

        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);

        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);

        enc4 = chr3 & 63;



        if (isNaN(chr2)) {

           enc3 = enc4 = 64;

        } else if (isNaN(chr3)) {

           enc4 = 64;

       }



        output = output +

           keyStr.charAt(enc1) +

           keyStr.charAt(enc2) +

           keyStr.charAt(enc3) +

           keyStr.charAt(enc4);

        chr1 = chr2 = chr3 = "";

        enc1 = enc2 = enc3 = enc4 = "";

     } while (i < input.length);



     return output;

  }



  function decode64(input) {

     var output = "";

     var chr1, chr2, chr3 = "";

     var enc1, enc2, enc3, enc4 = "";

     var i = 0;



     // remove all characters that are not A-Z, a-z, 0-9, +, /, or =

     var base64test = /[^A-Za-z0-9/+///=]/g;

     if (base64test.exec(input)) {

        alert("There were invalid base64 characters in the input text./n" +

              "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='/n" +

              "Expect errors in decoding.");

     }

     input = input.replace(/[^A-Za-z0-9/+///=]/g, "");



     do {

        enc1 = keyStr.indexOf(input.charAt(i++));

        enc2 = keyStr.indexOf(input.charAt(i++));

        enc3 = keyStr.indexOf(input.charAt(i++));

        enc4 = keyStr.indexOf(input.charAt(i++));



        chr1 = (enc1 << 2) | (enc2 >> 4);

        chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);

        chr3 = ((enc3 & 3) << 6) | enc4;



        output = output + String.fromCharCode(chr1);



        if (enc3 != 64) {

           output = output + String.fromCharCode(chr2);

        }

        if (enc4 != 64) {

           output = output + String.fromCharCode(chr3);

        }



        chr1 = chr2 = chr3 = "";

        enc1 = enc2 = enc3 = enc4 = "";



     } while (i < input.length);



     return unescape(output);

  }



  //--></script>



  <body>



     <form name="base64Form">



        Type in the message you want to encode in base64, or paste<br>

        base64 encoded text into the text field, select Encode or Decode, <br>

        and click the button!<br>



        <textarea name="theText" cols="40" rows="6"></textarea><br>



        <input type="button" name="encode" value="Encode to base64"

           onClick="document.base64Form.theText.value=encode64(document.base64Form.theText.value);">



        <input type="button" name="decode" value="Decode from base64"

           onClick="document.base64Form.theText.value=decode64(document.base64Form.theText.value);">



     </form>



  </body>

</html>















java 版本：












1./* Base64.java
2.*
3.* Author:       Ma Bingyao <[email protected]>
4.* Copyright:    CoolCode.CN
5.* Version:      1.5
6.* LastModified: 2006-08-09
7.* This library is free.  You can redistribute it and/or modify it.
8.* http://www.coolcode.cn/?p=203
9.*/ 
10.package org.phprpc.util; 
11.  
12.import java.lang.*; 
13.import java.io.*; 
14.  
15.public class Base64 { 
16.    private static char[] base64EncodeChars = new char[] { 
17.        'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 
18.        'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 
19.        'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 
20.        'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 
21.        'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 
22.        'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 
23.        'w', 'x', 'y', 'z', '0', '1', '2', '3', 
24.        '4', '5', '6', '7', '8', '9', '+', '/' }; 
25.  
26.    private static byte[] base64DecodeChars = new byte[] { 
27.    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
28.    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 
29.    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 
30.    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, 
31.    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 
32.    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, 
33.    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 
34.    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 }; 
35.  
36.    private Base64() {} 
37.  
38.    public static String encode(byte[] data) { 
39.        StringBuffer sb = new StringBuffer(); 
40.        int len = data.length; 
41.        int i = 0; 
42.        int b1, b2, b3; 
43.  
44.        while (i < len) { 
45.            b1 = data[i++] & 0xff; 
46.            if (i == len) { 
47.                sb.append(base64EncodeChars[b1 >>> 2]); 
48.                sb.append(base64EncodeChars[(b1 & 0x3) << 4]); 
49.                sb.append("=="); 
50.                break; 
51.            } 
52.            b2 = data[i++] & 0xff; 
53.            if (i == len) { 
54.                sb.append(base64EncodeChars[b1 >>> 2]); 
55.                sb.append( 
56.                        base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); 
57.                sb.append(base64EncodeChars[(b2 & 0x0f) << 2]); 
58.                sb.append("="); 
59.                break; 
60.            } 
61.            b3 = data[i++] & 0xff; 
62.            sb.append(base64EncodeChars[b1 >>> 2]); 
63.            sb.append( 
64.                    base64EncodeChars[((b1 & 0x03) << 4) | ((b2 & 0xf0) >>> 4)]); 
65.            sb.append( 
66.                    base64EncodeChars[((b2 & 0x0f) << 2) | ((b3 & 0xc0) >>> 6)]); 
67.            sb.append(base64EncodeChars[b3 & 0x3f]); 
68.        } 
69.        return sb.toString(); 
70.    } 
71.  
72.    public static byte[] decode(String str) { 
73.        byte[] data = str.getBytes(); 
74.        int len = data.length; 
75.        ByteArrayOutputStream buf = new ByteArrayOutputStream(len); 
76.        int i = 0; 
77.        int b1, b2, b3, b4; 
78.  
79.        while (i < len) { 
80.  
81.            /* b1 */ 
82.            do { 
83.                b1 = base64DecodeChars[data[i++]]; 
84.            } while (i < len && b1 == -1); 
85.            if (b1 == -1) { 
86.                break; 
87.            } 
88.  
89.            /* b2 */ 
90.            do { 
91.                b2 = base64DecodeChars[data[i++]]; 
92.            } while (i < len && b2 == -1); 
93.            if (b2 == -1) { 
94.                break; 
95.            } 
96.            buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4))); 
97.  
98.            /* b3 */ 
99.            do { 
100.                b3 = data[i++]; 
101.                if (b3 == 61) { 
102.                    return buf.toByteArray(); 
103.                } 
104.                b3 = base64DecodeChars[b3]; 
105.            } while (i < len && b3 == -1); 
106.            if (b3 == -1) { 
107.                break; 
108.            } 
109.            buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2))); 
110.  
111.            /* b4 */ 
112.            do { 
113.                b4 = data[i++]; 
114.                if (b4 == 61) { 
115.                    return buf.toByteArray(); 
116.                } 
117.                b4 = base64DecodeChars[b4]; 
118.            } while (i < len && b4 == -1); 
119.            if (b4 == -1) { 
120.                break; 
121.            } 
122.            buf.write((int) (((b3 & 0x03) << 6) | b4)); 
123.        } 
124.        return buf.toByteArray(); 
125.    } 
126.}