Adds string to byte array converter

teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TString.java

@@ -15,12 +15,10 @@
  */
 package org.teavm.classlib.java.lang;
 
-import org.teavm.classlib.impl.charset.ByteBuffer;
+import org.teavm.classlib.impl.charset.*;
-import org.teavm.classlib.impl.charset.CharBuffer;
-import org.teavm.classlib.impl.charset.Charset;
-import org.teavm.classlib.impl.charset.UTF16Helper;
 import org.teavm.classlib.java.io.TSerializable;
 import org.teavm.classlib.java.io.TUnsupportedEncodingException;
+import org.teavm.classlib.java.util.TArrays;
 import org.teavm.javascript.ni.GeneratedBy;
 import org.teavm.javascript.ni.Rename;
 
@@ -63,7 +61,7 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
     }
 
     public TString(byte[] bytes, int offset, int length) {
-        initWithBytes(bytes, offset, length, Charset.get("UTF-8"));
+        initWithBytes(bytes, offset, length, new UTF8Charset());
     }
 
     public TString(byte[] bytes) {
@@ -487,6 +485,37 @@ public class TString extends TObject implements TSerializable, TComparable<TStri
         return true;
     }
 
+    public byte[] getBytes(TString charsetName) throws TUnsupportedEncodingException {
+        Charset charset = Charset.get(charsetName.toString());
+        if (charset == null) {
+            throw new TUnsupportedEncodingException(TString.wrap("Unsupported encoding: " + charsetName));
+        }
+        return getBytes(charset);
+    }
+
+    public byte[] getBytes() {
+        return getBytes(new UTF8Charset());
+    }
+
+    private byte[] getBytes(Charset charset) {
+        byte[] result = new byte[length() * 2];
+        int resultLength = 0;
+        byte[] destArray = new byte[TMath.max(16, TMath.min(length() * 2, 4096))];
+        ByteBuffer dest = new ByteBuffer(destArray);
+        CharBuffer src = new CharBuffer(characters);
+        while (!src.end()) {
+            charset.encode(src, dest);
+            if (resultLength + dest.position() > result.length) {
+                result = TArrays.copyOf(result, result.length * 2);
+            }
+            for (int i = 0; i < dest.position(); ++i) {
+                result[resultLength++] = destArray[i];
+            }
+            dest.rewind(0);
+        }
+        return TArrays.copyOf(result, resultLength);
+    }
+
     @Override
     public int hashCode() {
         if (hashCode == 0) {

teavm-classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java

@@ -15,6 +15,7 @@
  */
 package org.teavm.classlib.java.util;
 
+import org.teavm.classlib.java.lang.TMath;
 import org.teavm.classlib.java.lang.TObject;
 
 /**
@@ -24,7 +25,16 @@ import org.teavm.classlib.java.lang.TObject;
 public class TArrays extends TObject {
     public static char[] copyOf(char[] array, int length) {
         char[] result = new char[length];
-        int sz = Math.min(length, array.length);
+        int sz = TMath.min(length, array.length);
+        for (int i = 0; i < sz; ++i) {
+            result[i] = array[i];
+        }
+        return result;
+    }
+
+    public static byte[] copyOf(byte[] array, int length) {
+        byte[] result = new byte[length];
+        int sz = TMath.min(length, array.length);
         for (int i = 0; i < sz; ++i) {
             result[i] = array[i];
         }

teavm-classlib/src/test/java/org/teavm/classlib/java/lang/StringTest.java

@@ -218,4 +218,56 @@ public class StringTest {
         byte[] bytes = { 65, -62, -69, -32, -82, -69, -16, -66, -78, -69 };
         assertEquals("A\u00BB\u0BBB\uD8BB\uDCBB", new String(bytes, "UTF-8"));
     }
+
+    @Test
+    public void createFromLongUTF8ByteArray() throws UnsupportedEncodingException {
+        byte[] bytes = new byte[16384];
+        for (int i = 0; i < bytes.length;) {
+             bytes[i++] = -16;
+             bytes[i++] = -66;
+             bytes[i++] = -78;
+             bytes[i++] = -69;
+        }
+        String str = new String(bytes, "UTF-8");
+        assertEquals('\uD8BB', str.charAt(8190));
+        assertEquals('\uDCBB', str.charAt(8191));
+    }
+
+    @Test
+    public void getByteArray() throws UnsupportedEncodingException {
+        byte[] bytes = "123".getBytes("UTF-8");
+        assertEquals(49, bytes[0]);
+        assertEquals(50, bytes[1]);
+        assertEquals(51, bytes[2]);
+        assertEquals(3, bytes.length);
+    }
+
+    @Test
+    public void getUTF8ByteArray() throws UnsupportedEncodingException {
+        byte[] bytes = "A\u00BB\u0BBB\uD8BB\uDCBB".getBytes("UTF-8");
+        assertEquals(65, bytes[0]);
+        assertEquals(-62, bytes[1]);
+        assertEquals(-69, bytes[2]);
+        assertEquals(-32, bytes[3]);
+        assertEquals(-82, bytes[4]);
+        assertEquals(-69, bytes[5]);
+        assertEquals(-16, bytes[6]);
+        assertEquals(-66, bytes[7]);
+        assertEquals(-78, bytes[8]);
+        assertEquals(-69, bytes[9]);
+    }
+
+    @Test
+    public void getUTF8ByteArrayOfLongString() throws UnsupportedEncodingException {
+        char[] chars = new char[8192];
+        for (int i = 0; i < chars.length;) {
+             chars[i++] = '\uD8BB';
+             chars[i++] = '\uDCBB';
+        }
+        byte[] bytes = new String(chars).getBytes("UTF-8");
+        assertEquals(-16, bytes[16380]);
+        assertEquals(-66, bytes[16381]);
+        assertEquals(-78, bytes[16382]);
+        assertEquals(-69, bytes[16383]);
+    }
 }