Fix base64 support

(cherry picked from commit 5da32e3a6583493a36c87bc02c8177a7740faaf7)

# Conflicts:
#	tests/src/test/java/org/teavm/classlib/java/lang/TestResourcesSupplier.java

classlib/src/main/java/org/teavm/classlib/impl/Base64.java

@@ -21,7 +21,7 @@ import java.util.Arrays;
  *
  * @author Alexey Andreev
  */
-public class Base64 {
+public final class Base64 {
     private static char[] alphabet = new char[64];
     private static int[] reverse = new int[256];
 
@@ -45,9 +45,13 @@ public class Base64 {
         }
     }
 
+    private Base64() {
+    }
+
     public static byte[] decode(String text) {
         int outputSize = ((text.length() - 1) / 4 + 1) * 3;
-        int i, j;
+        int i;
+        int j;
         for (i = text.length() - 1; i >= 0 && text.charAt(i) == '='; --i) {
             --outputSize;
         }
@@ -55,7 +59,7 @@ public class Base64 {
 
         int triples = (outputSize / 3) * 3;
         i = 0;
-        for (j = 0; i < triples;) {
+        for (j = 0; j < triples;) {
             int a = decode(text.charAt(i++));
             int b = decode(text.charAt(i++));
             int c = decode(text.charAt(i++));
@@ -63,7 +67,7 @@ public class Base64 {
             int out = (a << 18) | (b << 12) | (c << 6) | d;
             output[j++] = (byte) (out >>> 16);
             output[j++] = (byte) (out >>> 8);
-            output[j++] = (byte) (out);
+            output[j++] = (byte) out;
         }
         int rem = output.length - j;
         if (rem == 1) {

tests/src/test/java/org/teavm/classlib/java/lang/ClassLoaderTest.java

@@ -36,6 +36,7 @@ public class ClassLoaderTest {
         assertEquals("qwerty", loadResource("6"));
         assertEquals("qwertyu", loadResource("7"));
         assertEquals("qwertyui", loadResource("8"));
+        assertEquals("qwertyuiopasdfghjklzxcvbnm", loadResource("9"));
     }
 
     @Test

tests/src/test/java/org/teavm/classlib/java/lang/TestResourcesSupplier.java

@@ -21,7 +21,7 @@ import org.teavm.classlib.ResourceSupplierContext;
 public class TestResourcesSupplier implements ResourceSupplier {
     @Override
     public String[] supplyResources(ResourceSupplierContext context) {
-        String[] result = { "1", "2", "3", "4", "5", "6", "7", "8" };
+        String[] result = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
         for (int i = 0; i < result.length; ++i) {
             result[i] = "resources-for-test/" + result[i];
         }

tests/src/test/resources/resources-for-test/9

@@ -0,0 +1 @@
+qwertyuiopasdfghjklzxcvbnm