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package org.bouncycastle.util.encoders;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* 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.
*/
public class UrlBase64
{
private static final Encoder 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)
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
try
{
encoder.encode(data, 0, data.length, bOut);
}
catch (Exception e)
{
throw new EncoderException("exception encoding URL safe base64 data: " + e.getMessage(), e);
}
return bOut.toByteArray();
}
/**
* Encode the byte data writing it to the given output stream.
*
* @return the number of bytes produced.
*/
public static int encode(
byte[] data,
OutputStream out)
throws IOException
{
return encoder.encode(data, 0, data.length, out);
}
/**
* 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)
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
try
{
encoder.decode(data, 0, data.length, bOut);
}
catch (Exception e)
{
throw new DecoderException("exception decoding URL safe base64 string: " + e.getMessage(), e);
}
return bOut.toByteArray();
}
/**
* 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,
OutputStream out)
throws IOException
{
return encoder.decode(data, 0, data.length, out);
}
/**
* 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)
{
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
try
{
encoder.decode(data, bOut);
}
catch (Exception e)
{
throw new DecoderException("exception decoding URL safe base64 string: " + e.getMessage(), e);
}
return bOut.toByteArray();
}
/**
* 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,
OutputStream out)
throws IOException
{
return encoder.decode(data, out);
}
}
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