Add new constructor for char[] with charset

fixes #8

Author: patrickfav

src/main/java/at/favre/lib/bytes/Bytes.java

@@ -454,7 +454,21 @@ public static Bytes from(CharSequence string, Charset charset) {
      * @return new instance
      */
     public static Bytes from(char[] charArray) {
-        return from(CharBuffer.wrap(charArray).toString(), StandardCharsets.UTF_8);
+        return from(charArray, StandardCharsets.UTF_8);
+    }
+
+    /**
+     * Creates a new instance from given char array. The array will be handles like an encoded string
+     *
+     * @param charArray to get the internal byte array from
+     * @param charset   charset to be used to decode the char array
+     * @return new instance
+     */
+    public static Bytes from(char[] charArray, Charset charset) {
+        ByteBuffer bb = charset.encode(CharBuffer.wrap(charArray));
+        byte[] bytes = new byte[bb.remaining()];
+        bb.get(bytes);
+        return from(bytes);
     }
 
     /**

src/test/java/at/favre/lib/bytes/BytesConstructorTests.java

@@ -264,6 +264,12 @@ public void fromCharArray() {
         checkCharArray("\t");
         checkCharArray("a");
         checkCharArray("12345678abcdefjkl");
+        checkCharArray("é_,,(8áàäöü#+_  ,,mµ");
+
+        String s1 = "oaisdj`ßß__.#äöü_-  *aé";
+        assertArrayEquals(String.valueOf(s1.toCharArray()).getBytes(StandardCharsets.ISO_8859_1), Bytes.from(s1.toCharArray(), StandardCharsets.ISO_8859_1).array());
+        assertArrayEquals(String.valueOf(s1.toCharArray()).getBytes(StandardCharsets.UTF_16), Bytes.from(s1.toCharArray(), StandardCharsets.UTF_16).array());
+        assertArrayEquals(String.valueOf(s1.toCharArray()).getBytes(StandardCharsets.UTF_8), Bytes.from(s1.toCharArray(), StandardCharsets.UTF_8).array());
     }
 
     @Test
@@ -287,8 +293,10 @@ private void checkString(String string, Charset charset) {
     }
 
     private void checkCharArray(String s) {
-        Bytes b = Bytes.from(s.toCharArray());
-        assertArrayEquals(String.valueOf(s.toCharArray()).getBytes(StandardCharsets.UTF_8), b.array());
+        Bytes b1 = Bytes.from(s.toCharArray());
+        Bytes b2 = Bytes.from(s.toCharArray(), StandardCharsets.UTF_8);
+        assertArrayEquals(String.valueOf(s.toCharArray()).getBytes(StandardCharsets.UTF_8), b1.array());
+        assertArrayEquals(String.valueOf(s.toCharArray()).getBytes(StandardCharsets.UTF_8), b2.array());
     }
 
     @Test