| 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); |
| } |
| } |