Initial Commit

iTechSharp/srcbc/util/encoders/UrlBase64.cs

@@ -0,0 +1,127 @@
+using System;
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.Encoders
+{
+	/**
+	* Convert binary data to and from UrlBase64 encoding.  This is identical to
+	* Base64 encoding, except that the padding character is "." and the other 
+	* non-alphanumeric characters are "-" and "_" instead of "+" and "/".
+	* <p>
+	* The purpose of UrlBase64 encoding is to provide a compact encoding of binary
+	* data that is safe for use as an URL parameter. Base64 encoding does not
+	* produce encoded values that are safe for use in URLs, since "/" can be 
+	* interpreted as a path delimiter; "+" is the encoded form of a space; and
+	* "=" is used to separate a name from the corresponding value in an URL 
+	* parameter.
+	* </p>
+	*/
+	public class UrlBase64
+	{
+		private static readonly IEncoder encoder = new UrlBase64Encoder();
+
+		/**
+		* Encode the input data producing a URL safe base 64 encoded byte array.
+		*
+		* @return a byte array containing the URL safe base 64 encoded data.
+		*/
+		public static byte[] Encode(
+			byte[] data)
+		{
+			MemoryStream bOut = new MemoryStream();
+
+			try
+			{
+				encoder.Encode(data, 0, data.Length, bOut);
+			}
+			catch (IOException e)
+			{
+				throw new Exception("exception encoding URL safe base64 string: " + e.Message, e);
+			}
+
+			return bOut.ToArray();
+		}
+
+		/**
+		* Encode the byte data writing it to the given output stream.
+		*
+		* @return the number of bytes produced.
+		*/
+		public static int Encode(
+			byte[]	data,
+			Stream	outStr)
+		{
+			return encoder.Encode(data, 0, data.Length, outStr);
+		}
+
+		/**
+		* Decode the URL safe base 64 encoded input data - white space will be ignored.
+		*
+		* @return a byte array representing the decoded data.
+		*/
+		public static byte[] Decode(
+			byte[] data)
+		{
+			MemoryStream bOut = new MemoryStream();
+
+			try
+			{
+				encoder.Decode(data, 0, data.Length, bOut);
+			}
+			catch (IOException e)
+			{
+				throw new Exception("exception decoding URL safe base64 string: " + e.Message, e);
+			}
+
+			return bOut.ToArray();
+		}
+
+		/**
+		* decode the URL safe base 64 encoded byte data writing it to the given output stream,
+		* whitespace characters will be ignored.
+		*
+		* @return the number of bytes produced.
+		*/
+		public static int Decode(
+			byte[]	data,
+			Stream	outStr)
+		{
+			return encoder.Decode(data, 0, data.Length, outStr);
+		}
+
+		/**
+		* decode the URL safe base 64 encoded string data - whitespace will be ignored.
+		*
+		* @return a byte array representing the decoded data.
+		*/
+		public static byte[] Decode(
+			string data)
+		{
+			MemoryStream bOut = new MemoryStream();
+
+			try
+			{
+				encoder.DecodeString(data, bOut);
+			}
+			catch (IOException e)
+			{
+				throw new Exception("exception decoding URL safe base64 string: " + e.Message, e);
+			}
+	        
+			return bOut.ToArray();
+		}
+	    
+		/**
+		* Decode the URL safe base 64 encoded string data writing it to the given output stream,
+		* whitespace characters will be ignored.
+		*
+		* @return the number of bytes produced.
+		*/
+		public static int Decode(
+			string	data,
+			Stream	outStr)
+		{
+			return encoder.DecodeString(data, outStr);
+		}
+	}
+}