package com.hurlant.util{
import flash.utils.ByteArray;
public class Base64
{
private static const _encodeChars : Vector.<int> = InitEncoreChar();
private static const _decodeChars : Vector.<int> = InitDecodeChar();
public static function encodeByteArray(data : ByteArray) : String
{
var out : ByteArray = new ByteArray();
out.length = (2 + data.length - ((data.length + 2) % 3)) * 4 / 3; var i : 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++];
c = (_encodeChars[c >>> 18] << 24) | (_encodeChars[c >>> 12 & 0x3f] << 16) | (_encodeChars[c >>> 6 & 0x3f] << 8) | _encodeChars[c & 0x3f];
out.writeInt(c);
}
if (r == 1) {
c = data[i];
c = (_encodeChars[c >>> 2] << 24) | (_encodeChars[(c & 0x03) << 4] << 16) | 61 << 8 | 61;
out.writeInt(c);
}
else if (r == 2) {
c = data[i++] << 8 | data[i];
c = (_encodeChars[c >>> 10] << 24) | (_encodeChars[c >>> 4 & 0x3f] << 16) | (_encodeChars[(c & 0x0f) << 2] << 8) | 61;
out.writeInt(c);
}
out.position = 0;
return out.readUTFBytes(out.length);
}
public static function decodeToByteArray(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();
var byteString : ByteArray = new ByteArray();
byteString.writeUTFBytes(str);
while (i < len)
{
do
{
c1 = _decodeChars[byteString[i++]];
} while (i < len && c1 == -1);
if (c1 == -1) break;
do
{
c2 = _decodeChars[byteString[i++]];
} while (i < len && c2 == -1);
if (c2 == -1) break;
out.writeByte((c1 << 2) | ((c2 & 0x30) >> 4));
do
{
c3 = byteString[i++];
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));
do {
c4 = byteString[i++];
if (c4 == 61) return out;
c4 = _decodeChars[c4];
} while (i < len && c4 == -1);
if (c4 == -1) break;
out.writeByte(((c3 & 0x03) << 6) | c4);
}
out.position = 0;
return out;
}
public static function encode(data : String) : String {
var bytes : ByteArray = new ByteArray();
bytes.writeUTFBytes(data);
return encodeByteArray(bytes);
}
public static function decode(data : String) : String {
var bytes : ByteArray = decodeToByteArray(data);
return bytes.readUTFBytes(bytes.length);
}
public static function InitEncoreChar() : Vector.<int>
{
var encodeChars : Vector.<int> = new Vector.<int>();
var chars : String = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
for (var i : int = 0; i < 64; i++)
{
encodeChars.push(chars.charCodeAt(i));
}
return encodeChars;
}
public static function InitDecodeChar() : Vector.<int>
{
var decodeChars : Vector.<int> = new Vector.<int>();
decodeChars.push(-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
- 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, -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, -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);
return decodeChars;
}
}
}