基于 flash AS3.0 的BASE64编码与解码类

01? import?com.dynamicflash.utils.Base64;?????
02? //编码和解码字符串??
03? var?source: String?=? "Hello,world";?????
04? var?encoded: String?= Base64. encode(source);?????
05?trace(encoded);?????
06? var?decoded: decode(encoded);?????
07?trace(decoded);????
08? //编码和解码ByteArray??
09? var?obj: Object= {name: "Dynamic Flash",url: "http://dynamicflash.com"};??
10? ByteArray?=? new? ByteArray();??
11?source. writeObject(obj);??
12? encodeByteArray(source);??
13?trace(encoded);??
14? ByteArray?= Base64. decodeToByteArray(encoded);??
15?obj = decoded. readObject();??
16?trace(obj. name?+? "("?+ obj. url?+? ")");

ActionScript 3语言:? 临时自用代码@代码发芽网

1.? package?com.dynamicflash.util{??
2.? import?flash.utils.ByteArray;??
3.? public? class?Base64 {??
4.? private? static? const?BASE64_CHARS: String?= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";??
5.? const?version: "1.0.0";??
6.? function?encode(data: String): String?{??
7.? // Convert string to ByteArray
8.? var?bytes: 9.???????????? bytes. writeUTFBytes(data);??
10.? // Return encoded ByteArray
11.? return?encodeByteArray(bytes);??
12.???????? }??
13.? function?encodeByteArray(data: ByteArray): 14.? // Initialise output
15.? var?output: "";??
16.? // Create data and output buffers
17.? var?dataBuffer: Array;??
18.? var?outputBuffer: Array?=? Array( 4);??
19.? // Rewind ByteArray
20.???????????? data. position?=? 0;??
21.? // while there are still bytes to be processed
22.? while?(data. bytesAvailable?>? 0) {??
23.? // Create new data buffer and populate next 3 bytes from data
24.???????????????? dataBuffer =? Array();??
25.? for?( var?i: uint?=? 0; i <? 3?&& data. 0; i++) {??
26.???????????????????? dataBuffer[i] = data. readUnsignedByte();??
27.???????????????? }??
28.? // Convert to data buffer Base64 character positions and?
29.? // store in output buffer
30.???????????????? outputBuffer[ 0] = (dataBuffer[ 0] &? 0xfc) >>? 2;??
31.???????????????? outputBuffer[ 1] = ((dataBuffer[ 0x03) <<? 4) | ((dataBuffer[ 1]) >>? 32.???????????????? outputBuffer[ 2] = ((dataBuffer[ 1] &? 0x0f) <<? 2) | ((dataBuffer[ 2]) >>? 6);??
33.???????????????? outputBuffer[ 3] = dataBuffer[ 2] &? 0x3f;??
34.? // If data buffer was short (i.e not 3 characters) then set
35.? // end character indexes in data buffer to index of '=' symbol.
36.? // This is necessary because Base64 data is always a multiple of
37.? // 4 bytes and is basses with '=' symbols.
38.? var?j: uint?= dataBuffer. length; j <? 3; j++) {??
39.???????????????????? outputBuffer[j +? 1] =? 64;??
40.???????????????? }??
41.? // Loop through output buffer and add Base64 characters to?
42.? // encoded data string for each character.
43.? var?k: 0; k < outputBuffer. length; k++) {??
44.???????????????????? output += BASE64_CHARS. charAt(outputBuffer[k]);??
45.???????????????? }??
46.???????????? }??
47.? // Return encoded data
48.? return?output;??
49.???????? }??
50.? function?decode(data: 51.? // Decode data to ByteArray
52.? ByteArray?= decodeToByteArray(data);??
53.? // Convert to string and return
54.? return?bytes. readUTFBytes(bytes. length);??
55.???????? }??
56.? function?decodeToByteArray(data: ByteArray?{??
57.? // Initialise output ByteArray for decoded data
58.? 59.? 60.? 61.? 3);??
62.? // While there are data bytes left to be processed
63.? 0; i < data. length; i +=? 4) {??
64.? // Populate data buffer with position of Base64 characters for
65.? // next 4 bytes from encoded data
66.? 0; j <? 4?&& i + j < data. length; j++) {??
67.???????????????????? dataBuffer[j] = BASE64_CHARS. indexOf(data. charAt(i + j));??
68.???????????????? }??
69.? // Decode data buffer back into bytes
70.???????????????? outputBuffer[ 0] <<? 2) + ((dataBuffer[ 0x30) >>? 71.???????????????? outputBuffer[ 4) + ((dataBuffer[ 0x3c) >>? 2);??????????
72.???????????????? outputBuffer[ 6) + dataBuffer[ 3];??
73.? // Add all non-padded bytes in output buffer to decoded data
74.? 75.? if?(dataBuffer[k+ 1] ==? 64)? break;??
76.???????????????????? output. writeByte(outputBuffer[k]);??
77.???????????????? }??
78.???????????? }??
79.? // Rewind decoded data ByteArray
80.???????????? output. 81.? // Return decoded data
82.? 83.???????? }??
84.? function?Base64() ?{?
85.? throw? Error( "Base64 class is static container only");??
86.???????? }??
87.???? }??
88. }