UrlBase64.cs
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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);
}
}
}