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////////////////////////////////////////////////////////////////////////////////
//
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You under the Apache License, Version 2.0
// (the "License"); you may not use this file except in compliance with
// the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////////
package mx.utils
{
import flash.utils.ByteArray;
import mx.resources.IResourceManager;
import mx.resources.ResourceManager;
[ResourceBundle("utils")]
/**
* A utility class to decode a Base64 encoded String to a ByteArray.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public class Base64Decoder
{
//--------------------------------------------------------------------------
//
// Constructor
//
//--------------------------------------------------------------------------
/**
* Constructor.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function Base64Decoder()
{
super();
data = new ByteArray();
}
//--------------------------------------------------------------------------
//
// Methods
//
//--------------------------------------------------------------------------
/**
* Decodes a Base64 encoded String and adds the result to an internal
* buffer. Strings must be in ASCII format.
*
* <p>Subsequent calls to this method add on to the internal
* buffer. After all data have been encoded, call <code>toByteArray()</code>
* to obtain a decoded <code>flash.utils.ByteArray</code>.</p>
*
* @param encoded The Base64 encoded String to decode.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function decode(encoded:String):void
{
for (var i:uint = 0; i < encoded.length; ++i)
{
var c:Number = encoded.charCodeAt(i);
if (c == ESCAPE_CHAR_CODE)
work[count++] = -1;
else if (inverse[c] != 64)
work[count++] = inverse[c];
else
continue;
if (count == 4)
{
count = 0;
data.writeByte((work[0] << 2) | ((work[1] & 0xFF) >> 4));
filled++;
if (work[2] == -1)
break;
data.writeByte((work[1] << 4) | ((work[2] & 0xFF) >> 2));
filled++;
if (work[3] == -1)
break;
data.writeByte((work[2] << 6) | work[3]);
filled++;
}
}
}
/**
* @private
*/
public function drain():ByteArray
{
var result:ByteArray = new ByteArray();
var oldPosition:uint = data.position;
data.position = 0; // technically, shouldn't need to set this, but carrying over from previous implementation
result.writeBytes(data, 0, data.length);
data.position = oldPosition;
result.position = 0;
filled = 0;
return result;
}
/**
* @private
*/
public function flush():ByteArray
{
if (count > 0)
{
var message:String = resourceManager.getString("utils", "partialBlockDropped", [ count ]);
throw new Error(message);
}
return drain();
}
/**
* Clears all buffers and resets the decoder to its initial state.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function reset():void
{
data = new ByteArray();
count = 0;
filled = 0;
}
/**
* Returns the current buffer as a decoded <code>flash.utils.ByteArray</code>.
* Note that calling this method also clears the buffer and resets the
* decoder to its initial state.
*
* @return The decoded <code>flash.utils.ByteArray</code>.
*
* @langversion 3.0
* @playerversion Flash 9
* @playerversion AIR 1.1
* @productversion Flex 3
*/
public function toByteArray():ByteArray
{
var result:ByteArray = flush();
reset();
return result;
}
//--------------------------------------------------------------------------
//
// Private Variables
//
//--------------------------------------------------------------------------
private var count:int = 0;
private var data:ByteArray;
private var filled:int = 0;
private var work:Array = [0, 0, 0, 0];
/**
* @private
* Used for accessing localized Error messages.
*/
private var resourceManager:IResourceManager =
ResourceManager.getInstance();
private static const ESCAPE_CHAR_CODE:Number = 61; // The '=' char
private static const inverse:Array =
[
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
64, 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, 64, 64, 64, 64, 64,
64, 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, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
];
}
}