Add base64 and base64pad implementation

Author: ianopolous

src/main/java/io/ipfs/multibase/Multibase.java

@@ -1,6 +1,7 @@
 package io.ipfs.multibase;
 
 import io.ipfs.multibase.binary.*;
+import io.ipfs.multibase.binary.Base64;
 
 import java.util.*;
 
@@ -17,7 +18,9 @@ public enum Base {
         Base32Hex('v'),
         Base32HexUpper('V'),
         Base58Flickr('Z'),
-        Base58BTC('z');
+        Base58BTC('z'),
+        Base64('m'),
+        Base64Pad('M');
 
         public char prefix;
 
@@ -52,6 +55,10 @@ public static String encode(Base b, byte[] data) {
                 return b.prefix + new String(new Base32(true).encode(data)).toLowerCase().replaceAll("=", "");
             case Base32HexUpper:
                 return b.prefix + new String(new Base32(true).encode(data)).replaceAll("=", "");
+            case Base64:
+                return b.prefix + Base64.encodeBase64String(data).replaceAll("=", "");
+            case Base64Pad:
+                return b.prefix + Base64.encodeBase64String(data);
             default:
                 throw new IllegalStateException("Unsupported base encoding: " + b.name());
         }
@@ -77,6 +84,9 @@ public static byte[] decode(String data) {
                 return new Base32(true).decode(rest);
             case Base32HexUpper:
                 return new Base32(true).decode(rest.toLowerCase());
+            case Base64Pad:
+            case Base64:
+                return Base64.decodeBase64(rest);
             default:
                 throw new IllegalStateException("Unsupported base encoding: " + b.name());
         }

src/test/java/io/ipfs/multibase/MultibaseTest.java

@@ -49,6 +49,8 @@ public static Collection<Object[]> data() {
                 {Multibase.Base.Base32Hex, hexToBytes("446563656e7472616c697a652065766572797468696e67212121"), "v8him6pbeehp62r39f9ii0pbmclp7it38d5n6e89144"},
                 {Multibase.Base.Base32HexUpper, hexToBytes("446563656e7472616c697a652065766572797468696e67212121"), "V8HIM6PBEEHP62R39F9II0PBMCLP7IT38D5N6E89144"},
                 {Multibase.Base.Base58BTC, hexToBytes("446563656e7472616c697a652065766572797468696e67212121"), "z36UQrhJq9fNDS7DiAHM9YXqDHMPfr4EMArvt"},
+                {Multibase.Base.Base64, hexToBytes("446563656e7472616c697a652065766572797468696e67212121"), "mRGVjZW50cmFsaXplIGV2ZXJ5dGhpbmchISE"},
+                {Multibase.Base.Base64Pad, hexToBytes("446563656e7472616c697a652065766572797468696e67212121"), "MRGVjZW50cmFsaXplIGV2ZXJ5dGhpbmchISE="},
         });
     }