106 lines
4.0 KiB
ActionScript
106 lines
4.0 KiB
ActionScript
package com.foxarc.util{
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import flash.utils.ByteArray;
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public class Base64 {
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private static const encodeChars:Array =
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['A','B','C','D','E','F','G','H',
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'I','J','K','L','M','N','O','P',
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'Q','R','S','T','U','V','W','X',
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'Y','Z','a','b','c','d','e','f',
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'g','h','i','j','k','l','m','n',
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'o','p','q','r','s','t','u','v',
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'w','x','y','z','0','1','2','3',
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'4','5','6','7','8','9','+','/'];
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private static const decodeChars:Array =
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[-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, -1, -1, -1, -1, -1,
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-1, -1, -1, 62, -1, -1, -1, 63,
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52, 53, 54, 55, 56, 57, 58, 59,
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60, 61, -1, -1, -1, -1, -1, -1,
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-1, 0, 1, 2, 3, 4, 5, 6,
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7, 8, 9, 10, 11, 12, 13, 14,
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15, 16, 17, 18, 19, 20, 21, 22,
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23, 24, 25, -1, -1, -1, -1, -1,
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-1, 26, 27, 28, 29, 30, 31, 32,
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33, 34, 35, 36, 37, 38, 39, 40,
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41, 42, 43, 44, 45, 46, 47, 48,
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49, 50, 51, -1, -1, -1, -1, -1];
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public static function encode(data:ByteArray):String {
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var out:Array = [];
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var i:int = 0;
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var j:int = 0;
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var r:int = data.length % 3;
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var len:int = data.length - r;
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var c:int;
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while (i < len) {
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c = data[i++] << 16 | data[i++] << 8 | data[i++];
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out[j++] = encodeChars[c >> 18] + encodeChars[c >> 12 & 0x3f] + encodeChars[c >> 6 & 0x3f] + encodeChars[c & 0x3f];
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}
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if (r == 1) {
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c = data[i++];
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out[j++] = encodeChars[c >> 2] + encodeChars[(c & 0x03) << 4] + "==";
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}
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else if (r == 2) {
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c = data[i++] << 8 | data[i++];
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out[j++] = encodeChars[c >> 10] + encodeChars[c >> 4 & 0x3f] + encodeChars[(c & 0x0f) << 2] + "=";
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}
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return out.join('');
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}
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public static function decode(str:String):ByteArray {
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var c1:int;
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var c2:int;
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var c3:int;
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var c4:int;
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var i:int;
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var len:int;
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var out:ByteArray;
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len = str.length;
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i = 0;
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out = new ByteArray();
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while (i < len) {
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// c1
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do {
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c1 = decodeChars[str.charCodeAt(i++) & 0xff];
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} while (i < len && c1 == -1);
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if (c1 == -1) {
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break;
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}
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// c2
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do {
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c2 = decodeChars[str.charCodeAt(i++) & 0xff];
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} while (i < len && c2 == -1);
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if (c2 == -1) {
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break;
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}
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out.writeByte((c1 << 2) | ((c2 & 0x30) >> 4));
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// c3
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do {
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c3 = str.charCodeAt(i++) & 0xff;
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if (c3 == 61) {
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return out;
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}
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c3 = decodeChars[c3];
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} while (i < len && c3 == -1);
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if (c3 == -1) {
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break;
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}
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out.writeByte(((c2 & 0x0f) << 4) | ((c3 & 0x3c) >> 2));
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// c4
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do {
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c4 = str.charCodeAt(i++) & 0xff;
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if (c4 == 61) {
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return out;
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}
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c4 = decodeChars[c4];
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} while (i < len && c4 == -1);
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if (c4 == -1) {
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break;
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}
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out.writeByte(((c3 & 0x03) << 6) | c4);
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}
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return out;
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}
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}
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} |