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package io.polaris.core.codec;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* @author Qt
* @since 1.8
*/
public class Base64 {
private static final Encoder encoder = new Base64Encoder();
public static String encodeToString(byte[] data) {
return encodeToString(data, 0, data.length);
}
public static String encodeToString(byte[] data, int off, int length) {
byte[] encoded = encode(data, off, length);
return CodecStrings.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 = encoder.getEncodedLength(length);
ByteArrayOutputStream bOut = new ByteArrayOutputStream(len);
try {
encoder.encode(data, off, length, bOut);
} catch (Exception e) {
throw new CodecException("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 CodecException("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 CodecException("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);
}
/**
* Decode to an output stream;
*
* @param base64Data The source data.
* @param start Start position.
* @param length the length.
* @param out The output stream to write to.
*/
public static int decode(byte[] base64Data, int start, int length, OutputStream out) {
try {
return encoder.decode(base64Data, start, length, out);
} catch (Exception e) {
throw new CodecException("unable to decode base64 data: " + e.getMessage(), e);
}
}
}
