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package org.bouncycastle.util.encoders;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.bouncycastle.util.Strings;
/**
* Utility class for converting Base64 data to bytes and back again.
*/
public class Base64
{
private static final Encoder encoder = new Base64Encoder();
public static String toBase64String(
byte[] data)
{
return toBase64String(data, 0, data.length);
}
public static String toBase64String(
byte[] data,
int off,
int length)
{
byte[] encoded = encode(data, off, length);
return Strings.fromByteArray(encoded);
}
/**
* encode the input data producing a base 64 encoded byte array.
*
* @return a byte array containing the base 64 encoded data.
*/
public static byte[] encode(
byte[] data)
{
return encode(data, 0, data.length);
}
/**
* encode the input data producing a base 64 encoded byte array.
*
* @return a byte array containing the base 64 encoded data.
*/
public static byte[] encode(
byte[] data,
int off,
int length)
{
int len = (length + 2) / 3 * 4;
ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
try
{
encoder.encode(data, off, length, bOut);
}
catch (Exception e)
{
throw new EncoderException("exception encoding base64 string: " + e.getMessage(), e);
}
return bOut.toByteArray();
}
/**
* Encode the byte data to base 64 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);
}
/**
* Encode the byte data to base 64 writing it to the given output stream.
*
* @return the number of bytes produced.
*/
public static int encode(
byte[] data,
int off,
int length,
OutputStream out)
throws IOException
{
return encoder.encode(data, off, length, out);
}
/**
* decode the base 64 encoded input data. It is assumed the input data is valid.
*
* @return a byte array representing the decoded data.
*/
public static byte[] decode(
byte[] data)
{
int len = data.length / 4 * 3;
ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
try
{
encoder.decode(data, 0, data.length, bOut);
}
catch (Exception e)
{
throw new DecoderException("unable to decode base64 data: " + e.getMessage(), e);
}
return bOut.toByteArray();
}
/**
* decode the base 64 encoded String data - whitespace will be ignored.
*
* @return a byte array representing the decoded data.
*/
public static byte[] decode(
String data)
{
int len = data.length() / 4 * 3;
ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
try
{
encoder.decode(data, bOut);
}
catch (Exception e)
{
throw new DecoderException("unable to decode base64 string: " + e.getMessage(), e);
}
return bOut.toByteArray();
}
/**
* decode the 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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