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+/*
+	Adobe Systems Incorporated(r) Source Code License Agreement
+	Copyright(c) 2005 Adobe Systems Incorporated. All rights reserved.
+	
+	Please read this Source Code License Agreement carefully before using
+	the source code.
+	
+	Adobe Systems Incorporated grants to you a perpetual, worldwide, non-exclusive, 
+	no-charge, royalty-free, irrevocable copyright license, to reproduce,
+	prepare derivative works of, publicly display, publicly perform, and
+	distribute this source code and such derivative works in source or 
+	object code form without any attribution requirements.  
+	
+	The name "Adobe Systems Incorporated" must not be used to endorse or promote products
+	derived from the source code without prior written permission.
+	
+	You agree to indemnify, hold harmless and defend Adobe Systems Incorporated from and
+	against any loss, damage, claims or lawsuits, including attorney's 
+	fees that arise or result from your use or distribution of the source 
+	code.
+	
+	THIS SOURCE CODE IS PROVIDED "AS IS" AND "WITH ALL FAULTS", WITHOUT 
+	ANY TECHNICAL SUPPORT OR ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING,
+	BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+	FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  ALSO, THERE IS NO WARRANTY OF 
+	NON-INFRINGEMENT, TITLE OR QUIET ENJOYMENT.  IN NO EVENT SHALL MACROMEDIA
+	OR ITS SUPPLIERS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+	EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
+	PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+	OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+	WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
+	OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOURCE CODE, EVEN IF
+	ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+package com.adobe.net
+{
+	import flash.utils.ByteArray;
+	
+	/**
+	 * This class implements an efficient lookup table for URI
+	 * character escaping.  This class is only needed if you
+	 * create a derived class of URI to handle custom URI
+	 * syntax.  This class is used internally by URI.
+	 * 
+	 * @langversion ActionScript 3.0
+	 * @playerversion Flash 9.0* 
+	 */
+	public class URIEncodingBitmap extends ByteArray
+	{
+		/**
+		 * Constructor.  Creates an encoding bitmap using the given
+		 * string of characters as the set of characters that need
+		 * to be URI escaped.
+		 * 
+		 * @langversion ActionScript 3.0
+		 * @playerversion Flash 9.0
+		 */
+		public function URIEncodingBitmap(charsToEscape:String) : void
+		{
+			var i:int;
+			var data:ByteArray = new ByteArray();
+			
+			// Initialize our 128 bits (16 bytes) to zero
+			for (i = 0; i < 16; i++)
+				this.writeByte(0);
+				
+			data.writeUTFBytes(charsToEscape);
+			data.position = 0;
+			
+			while (data.bytesAvailable)
+			{
+				var c:int = data.readByte();
+				
+				if (c > 0x7f)
+					continue;  // only escape low bytes
+					
+				var enc:int;
+				this.position = (c >> 3);
+				enc = this.readByte();
+				enc |= 1 << (c & 0x7);
+				this.position = (c >> 3);
+				this.writeByte(enc);
+			}
+		}
+		
+		/**
+		 * Based on the data table contained in this object, check
+		 * if the given character should be escaped.
+		 * 
+		 * @param char	the character to be escaped.  Only the first
+		 * character in the string is used.  Any other characters
+		 * are ignored.
+		 * 
+		 * @return	the integer value of the raw UTF8 character.  For
+		 * example, if '%' is given, the return value is 37 (0x25).
+		 * If the character given does not need to be escaped, the
+		 * return value is zero.
+		 * 
+		 * @langversion ActionScript 3.0
+		 * @playerversion Flash 9.0 
+		 */
+		public function ShouldEscape(char:String) : int
+		{
+			var data:ByteArray = new ByteArray();
+			var c:int, mask:int;
+			
+			// write the character into a ByteArray so
+			// we can pull it out as a raw byte value.
+			data.writeUTFBytes(char);
+			data.position = 0;
+			c = data.readByte();
+			
+			if (c & 0x80)
+			{
+				// don't escape high byte characters.  It can make international
+				// URI's unreadable.  We just want to escape characters that would
+				// make URI syntax ambiguous.
+				return 0;
+			}
+			else if ((c < 0x1f) || (c == 0x7f))
+			{
+				// control characters must be escaped.
+				return c;
+			}
+			
+			this.position = (c >> 3);
+			mask = this.readByte();
+			
+			if (mask & (1 << (c & 0x7)))
+			{
+				// we need to escape this, return the numeric value
+				// of the character
+				return c;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+	}
+}