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package com.fireflysource.common.codec.base64;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
public abstract class Base64Utils {
private static final Charset DEFAULT_CHARSET = StandardCharsets.UTF_8;
private static final Base64Delegate delegate = new CommonsCodecBase64Delegate();
/**
* Base64-encode the given byte array.
*
* @param src the original byte array (may be {@code null})
* @return the encoded byte array (or {@code null} if the input was
* {@code null})
*/
public static byte[] encode(byte[] src) {
return delegate.encode(src);
}
/**
* Base64-decode the given byte array.
*
* @param src the encoded byte array (may be {@code null})
* @return the original byte array (or {@code null} if the input was
* {@code null})
*/
public static byte[] decode(byte[] src) {
return delegate.decode(src);
}
/**
* Base64-encode the given byte array using the RFC 4868
* "URL and Filename Safe Alphabet".
*
* @param src the original byte array (may be {@code null})
* @return the encoded byte array (or {@code null} if the input was
* {@code null})
*/
public static byte[] encodeUrlSafe(byte[] src) {
return delegate.encodeUrlSafe(src);
}
/**
* Base64-decode the given byte array using the RFC 4868
* "URL and Filename Safe Alphabet".
*
* @param src the encoded byte array (may be {@code null})
* @return the original byte array (or {@code null} if the input was
* {@code null})
*/
public static byte[] decodeUrlSafe(byte[] src) {
return delegate.decodeUrlSafe(src);
}
/**
* Base64-encode the given byte array to a String.
*
* @param src the original byte array (may be {@code null})
* @return the encoded byte array as a UTF-8 String (or {@code null} if the
* input was {@code null})
*/
public static String encodeToString(byte[] src) {
if (src == null) {
return null;
}
if (src.length == 0) {
return "";
}
return new String(delegate.encode(src), DEFAULT_CHARSET);
}
/**
* Base64-decode the given byte array from an UTF-8 String.
*
* @param src the encoded UTF-8 String (may be {@code null})
* @return the original byte array (or {@code null} if the input was
* {@code null})
*/
public static byte[] decodeFromString(String src) {
if (src == null) {
return null;
}
if (src.length() == 0) {
return new byte[0];
}
return delegate.decode(src.getBytes(DEFAULT_CHARSET));
}
/**
* Base64-encode the given byte array to a String using the RFC 4868
* "URL and Filename Safe Alphabet".
*
* @param src the original byte array (may be {@code null})
* @return the encoded byte array as a UTF-8 String (or {@code null} if the
* input was {@code null})
*/
public static String encodeToUrlSafeString(byte[] src) {
return new String(delegate.encodeUrlSafe(src), DEFAULT_CHARSET);
}
/**
* Base64-decode the given byte array from an UTF-8 String using the RFC
* 4868 "URL and Filename Safe Alphabet".
*
* @param src the encoded UTF-8 String (may be {@code null})
* @return the original byte array (or {@code null} if the input was
* {@code null})
*/
public static byte[] decodeFromUrlSafeString(String src) {
return delegate.decodeUrlSafe(src.getBytes(DEFAULT_CHARSET));
}
interface Base64Delegate {
byte[] encode(byte[] src);
byte[] decode(byte[] src);
byte[] encodeUrlSafe(byte[] src);
byte[] decodeUrlSafe(byte[] src);
}
static class CommonsCodecBase64Delegate implements Base64Delegate {
private final Base64 base64 = new Base64();
private final Base64 base64UrlSafe = new Base64(0, null, true);
@Override
public byte[] encode(byte[] src) {
return this.base64.encode(src);
}
@Override
public byte[] decode(byte[] src) {
return this.base64.decode(src);
}
@Override
public byte[] encodeUrlSafe(byte[] src) {
return this.base64UrlSafe.encode(src);
}
@Override
public byte[] decodeUrlSafe(byte[] src) {
return this.base64UrlSafe.decode(src);
}
}
}