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////////////////////////////////////////////////////////////////////////////////
//
// ADOBE SYSTEMS INCORPORATED
// Copyright 2004-2007 Adobe Systems Incorporated
// All Rights Reserved.
//
// NOTICE: Adobe permits you to use, modify, and distribute this file
// in accordance with the terms of the license agreement accompanying it.
//
////////////////////////////////////////////////////////////////////////////////
package mx.utils
{
import flash.utils.ByteArray;
/**
* A utility class to encode a String or ByteArray as a Base64 encoded String.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public class Base64Encoder
{
//--------------------------------------------------------------------------
//
// Static Class Variables
//
//--------------------------------------------------------------------------
/**
* Constant definition for the string "UTF-8".
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public static const CHARSET_UTF_8:String = "UTF-8";
/**
* The character codepoint to be inserted into the encoded output to
* denote a new line if <code>insertNewLines</code> is true.
*
* The default is <code>10</code> to represent the line feed <code>\n</code>.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public static var newLine:int = 10;
//--------------------------------------------------------------------------
//
// Constructor
//
//--------------------------------------------------------------------------
/**
* Constructor.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function Base64Encoder()
{
super();
reset();
}
//--------------------------------------------------------------------------
//
// Variables
//
//--------------------------------------------------------------------------
/**
* A Boolean flag to control whether the sequence of characters specified
* for <code>Base64Encoder.newLine</code> are inserted every 76 characters
* to wrap the encoded output.
*
* The default is true.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public var insertNewLines:Boolean = true;
//--------------------------------------------------------------------------
//
// Public Methods
//
//--------------------------------------------------------------------------
/**
* @private
*/
public function drain():String
{
var result:String = "";
for (var i:uint = 0; i < _buffers.length; i++)
{
var buffer:Array = _buffers[i] as Array;
result += String.fromCharCode.apply(null, buffer);
}
_buffers = [];
_buffers.push([]);
return result;
}
/**
* Encodes the characters of a String in Base64 and adds the result to
* an internal buffer. Subsequent calls to this method add on to the
* internal buffer. After all data have been encoded, call
* <code>toString()</code> to obtain a Base64 encoded String.
*
* @param data The String to encode.
* @param offset The character position from which to start encoding.
* @param length The number of characters to encode from the offset.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function encode(data:String, offset:uint=0, length:uint=0):void
{
if (length == 0)
length = data.length;
var currentIndex:uint = offset;
var endIndex:uint = offset + length;
if (endIndex > data.length)
endIndex = data.length;
while (currentIndex < endIndex)
{
_work[_count] = data.charCodeAt(currentIndex);
_count++;
if (_count == _work.length || endIndex - currentIndex == 1)
{
encodeBlock();
_count = 0;
_work[0] = 0;
_work[1] = 0;
_work[2] = 0;
}
currentIndex++;
}
}
/**
* Encodes the UTF-8 bytes of a String in Base64 and adds the result to an
* internal buffer. The UTF-8 information does not contain a length prefix.
* Subsequent calls to this method add on to the internal buffer. After all
* data have been encoded, call <code>toString()</code> to obtain a Base64
* encoded String.
*
* @param data The String to encode.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function encodeUTFBytes(data:String):void
{
var bytes:ByteArray = new ByteArray();
bytes.writeUTFBytes(data);
bytes.position = 0;
encodeBytes(bytes);
}
/**
* Encodes a ByteArray in Base64 and adds the result to an internal buffer.
* Subsequent calls to this method add on to the internal buffer. After all
* data have been encoded, call <code>toString()</code> to obtain a
* Base64 encoded String.
*
* @param data The ByteArray to encode.
* @param offset The index from which to start encoding.
* @param length The number of bytes to encode from the offset.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function encodeBytes(data:ByteArray, offset:uint=0, length:uint=0):void
{
if (length == 0)
length = data.length;
var oldPosition:uint = data.position;
data.position = offset;
var currentIndex:uint = offset;
var endIndex:uint = offset + length;
if (endIndex > data.length)
endIndex = data.length;
while (currentIndex < endIndex)
{
_work[_count] = data[currentIndex];
_count++;
if (_count == _work.length || endIndex - currentIndex == 1)
{
encodeBlock();
_count = 0;
_work[0] = 0;
_work[1] = 0;
_work[2] = 0;
}
currentIndex++;
}
data.position = oldPosition;
}
/**
* @private
*/
public function flush():String
{
if (_count > 0)
encodeBlock();
var result:String = drain();
reset();
return result;
}
/**
* Clears all buffers and resets the encoder to its initial state.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function reset():void
{
_buffers = [];
_buffers.push([]);
_count = 0;
_line = 0;
_work[0] = 0;
_work[1] = 0;
_work[2] = 0;
}
/**
* Returns the current buffer as a Base64 encoded String. Note that
* calling this method also clears the buffer and resets the
* encoder to its initial state.
*
* @return The Base64 encoded String.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function toString():String
{
return flush();
}
//--------------------------------------------------------------------------
//
// Private Methods
//
//--------------------------------------------------------------------------
/**
* @private
*/
private function encodeBlock():void
{
var currentBuffer:Array = _buffers[_buffers.length - 1] as Array;
if (currentBuffer.length >= MAX_BUFFER_SIZE)
{
currentBuffer = [];
_buffers.push(currentBuffer);
}
currentBuffer.push(ALPHABET_CHAR_CODES[(_work[0] & 0xFF) >> 2]);
currentBuffer.push(ALPHABET_CHAR_CODES[((_work[0] & 0x03) << 4) | ((_work[1] & 0xF0) >> 4)]);
if (_count > 1)
currentBuffer.push(ALPHABET_CHAR_CODES[((_work[1] & 0x0F) << 2) | ((_work[2] & 0xC0) >> 6) ]);
else
currentBuffer.push(ESCAPE_CHAR_CODE);
if (_count > 2)
currentBuffer.push(ALPHABET_CHAR_CODES[_work[2] & 0x3F]);
else
currentBuffer.push(ESCAPE_CHAR_CODE);
if (insertNewLines)
{
if ((_line += 4) == 76)
{
currentBuffer.push(newLine);
_line = 0;
}
}
}
//--------------------------------------------------------------------------
//
// Private Variables
//
//--------------------------------------------------------------------------
/**
* An Array of buffer Arrays.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
private var _buffers:Array;
private var _count:uint;
private var _line:uint;
private var _work:Array = [ 0, 0, 0 ];
/**
* This value represents a safe number of characters (i.e. arguments) that
* can be passed to String.fromCharCode.apply() without exceeding the AVM+
* stack limit.
*
* @private
*/
public static const MAX_BUFFER_SIZE:uint = 32767;
private static const ESCAPE_CHAR_CODE:Number = 61; // The '=' char
/*
'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 ALPHABET_CHAR_CODES:Array =
[
65, 66, 67, 68, 69, 70, 71, 72,
73, 74, 75, 76, 77, 78, 79, 80,
81, 82, 83, 84, 85, 86, 87, 88,
89, 90, 97, 98, 99, 100, 101, 102,
103, 104, 105, 106, 107, 108, 109, 110,
111, 112, 113, 114, 115, 116, 117, 118,
119, 120, 121, 122, 48, 49, 50, 51,
52, 53, 54, 55, 56, 57, 43, 47
];
}
}
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