AS2的base64函数代码,ActionScript代码库,德仔网

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【ActionScript】 AS2的base64函数
作者: / 发布于2011/1/3/ 2097
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            <pre style="line-height: 150%; font-family: Verdana, Monospace; font-size: 12px; font-weight: bold; margin-right: 10px"><span style="font-style: italic; color: #808080">/**</span>
<span style="font-style: italic; color: #808080">* Decodes a base64 string</span>
<span style="font-style: italic; color: #808080">*/</span>
<span style="color: #0000ff">function</span> decode<span style="color: #66cc66">(</span>src:<span style="color: blue">String</span><span style="color: #66cc66">)</span>:<span style="color: blue">String</span> <span style="color: #66cc66">{</span>
<span style="color: #0000ff">var</span> base64chars:<span style="color: blue">String</span> = <span style="color: #ff0000">"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="</span>;
<span style="color: #0000ff">var</span> i:<span style="color: blue">Number</span> = <span style="color: #cc66cc">0</span>;
<span style="color: #0000ff">var</span> output:<span style="color: blue">String</span> = <span style="color: #0000ff">new</span> <span style="color: blue">String</span><span style="color: #66cc66">(</span><span style="color: #ff0000">""</span><span style="color: #66cc66">)</span>;
<span style="color: #0000ff">var</span> chr1:<span style="color: blue">Number</span>, chr2:<span style="color: blue">Number</span>, chr3:<span style="color: blue">Number</span>;
<span style="color: #0000ff">var</span> enc1:<span style="color: blue">Number</span>, enc2:<span style="color: blue">Number</span>, enc3:<span style="color: blue">Number</span>, enc4:<span style="color: blue">Number</span>;
<span style="color: #0099cc">while</span> <span style="color: #66cc66">(</span>i<span style="color: #66cc66"><</span>src.<span style="color: blue">length</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 enc1 = base64chars.<span style="color: blue">indexOf</span><span style="color: #66cc66">(</span>src.<span style="color: blue">charAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 enc2 = base64chars.<span style="color: blue">indexOf</span><span style="color: #66cc66">(</span>src.<span style="color: blue">charAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 enc3 = base64chars.<span style="color: blue">indexOf</span><span style="color: #66cc66">(</span>src.<span style="color: blue">charAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 enc4 = base64chars.<span style="color: blue">indexOf</span><span style="color: #66cc66">(</span>src.<span style="color: blue">charAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 chr1 = <span style="color: #66cc66">(</span>enc1 <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">2</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span>enc2 <span style="color: #66cc66">>></span> <span style="color: #cc66cc">4</span><span style="color: #66cc66">)</span>;
 chr2 = <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>enc2 <span style="color: #66cc66">&</span> <span style="color: #cc66cc">15</span><span style="color: #66cc66">)</span> <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">4</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span>enc3 <span style="color: #66cc66">>></span> <span style="color: #cc66cc">2</span><span style="color: #66cc66">)</span>;
 chr3 = <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>enc3 <span style="color: #66cc66">&</span> <span style="color: #cc66cc">3</span><span style="color: #66cc66">)</span> <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">6</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">|</span> enc4;
 output += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>chr1<span style="color: #66cc66">)</span>;
 <span style="color: #0099cc">if</span> <span style="color: #66cc66">(</span>enc3 <span style="color: #66cc66">!</span>= <span style="color: #cc66cc">64</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 output = output+<span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>chr2<span style="color: #66cc66">)</span>;
 <span style="color: #66cc66">}</span>
 <span style="color: #0099cc">if</span> <span style="color: #66cc66">(</span>enc4 <span style="color: #66cc66">!</span>= <span style="color: #cc66cc">64</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 output = output+<span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>chr3<span style="color: #66cc66">)</span>;
 <span style="color: #66cc66">}</span>
<span style="color: #66cc66">}</span>
<span style="color: #0099cc">return</span> utf8to16<span style="color: #66cc66">(</span>output<span style="color: #66cc66">)</span>;
<span style="color: #66cc66">}</span>

<span style="color: #0000ff">function</span> utf16to8<span style="color: #66cc66">(</span>str<span style="color: #66cc66">)</span>:<span style="color: blue">String</span> <span style="color: #66cc66">{</span>
<span style="color: #0000ff">var</span> out, i, len, c;
out = <span style="color: #ff0000">""</span>;
len = str.<span style="color: blue">length</span>;
<span style="color: #0099cc">for</span> <span style="color: #66cc66">(</span>i=<span style="color: #cc66cc">0</span>; i<span style="color: #66cc66"><</span>len; i++<span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 c = str.<span style="color: blue">charCodeAt</span><span style="color: #66cc66">(</span>i<span style="color: #66cc66">)</span>;
 <span style="color: #0099cc">if</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c<span style="color: #66cc66">></span>=0x0001<span style="color: #66cc66">)</span> <span style="color: #66cc66">&&</span> <span style="color: #66cc66">(</span>c<span style="color: #66cc66"><</span>=0x007F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 out += str.<span style="color: blue">charAt</span><span style="color: #66cc66">(</span>i<span style="color: #66cc66">)</span>;
 <span style="color: #66cc66">}</span> <span style="color: #0099cc">else</span> <span style="color: #0099cc">if</span> <span style="color: #66cc66">(</span>c<span style="color: #66cc66">></span>0x07FF<span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>0xE0 <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">>></span> <span style="color: #cc66cc">12</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">&</span> 0x0F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>0x80 <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">>></span> <span style="color: #cc66cc">6</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">&</span> 0x3F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>0x80 <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">>></span> <span style="color: #cc66cc">0</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">&</span> 0x3F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 <span style="color: #66cc66">}</span> <span style="color: #0099cc">else</span> <span style="color: #66cc66">{</span>
 out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>0xC0 <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">>></span> <span style="color: #cc66cc">6</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">&</span> 0x1F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span>0x80 <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">>></span> <span style="color: #cc66cc">0</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">&</span> 0x3F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
 <span style="color: #66cc66">}</span>
<span style="color: #66cc66">}</span>
<span style="color: #0099cc">return</span> out;
<span style="color: #66cc66">}</span>
<span style="color: #0000ff">function</span> utf8to16<span style="color: #66cc66">(</span>str<span style="color: #66cc66">)</span>:<span style="color: blue">String</span> <span style="color: #66cc66">{</span>
<span style="color: #0000ff">var</span> out, i, len, c;
<span style="color: #0000ff">var</span> char2, char3;
out = <span style="color: #ff0000">""</span>;
len = str.<span style="color: blue">length</span>;
i = <span style="color: #cc66cc">0</span>;
<span style="color: #0099cc">while</span> <span style="color: #66cc66">(</span>i<span style="color: #66cc66"><</span>len<span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 c = str.<span style="color: blue">charCodeAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span>;
 <span style="color: #0099cc">switch</span> <span style="color: #66cc66">(</span>c <span style="color: #66cc66">>></span> <span style="color: #cc66cc">4</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">{</span>
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">0</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">1</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">2</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">3</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">4</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">5</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">6</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">7</span> :

  out += str.<span style="color: blue">charAt</span><span style="color: #66cc66">(</span>i-<span style="color: #cc66cc">1</span><span style="color: #66cc66">)</span>;
  <span style="color: #0099cc">break</span>;
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">12</span> :
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">13</span> :

  char2 = str.<span style="color: blue">charCodeAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span>;
  out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span><span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">&</span> 0x1F<span style="color: #66cc66">)</span> <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">6</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span>char2 <span style="color: #66cc66">&</span> 0x3F<span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
  <span style="color: #0099cc">break</span>;
 <span style="color: #0099cc">case</span> <span style="color: #cc66cc">14</span> :

  char2 = str.<span style="color: blue">charCodeAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span>;
  char3 = str.<span style="color: blue">charCodeAt</span><span style="color: #66cc66">(</span>i++<span style="color: #66cc66">)</span>;
  out += <span style="color: blue">String</span>.<span style="color: blue">fromCharCode</span><span style="color: #66cc66">(</span><span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>c <span style="color: #66cc66">&</span> 0x0F<span style="color: #66cc66">)</span> <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">12</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>char2 <span style="color: #66cc66">&</span> 0x3F<span style="color: #66cc66">)</span> <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">6</span><span style="color: #66cc66">)</span> <span style="color: #66cc66">|</span> <span style="color: #66cc66">(</span><span style="color: #66cc66">(</span>char3 <span style="color: #66cc66">&</span> 0x3F<span style="color: #66cc66">)</span> <span style="color: #66cc66"><<</span> <span style="color: #cc66cc">0</span><span style="color: #66cc66">)</span><span style="color: #66cc66">)</span>;
  <span style="color: #0099cc">break</span>;
 <span style="color: #66cc66">}</span>
<span style="color: #66cc66">}</span>
<span style="color: #0099cc">return</span> out;
<span style="color: #66cc66">}</span></pre>
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