calculate the correct length of the command to be transmitted for special characters like ä,ö...

src/se/vidstige/jadb/Transport.java

@@ -51,7 +51,7 @@ class Transport implements Closeable {
     }
 
     private String getCommandLength(String command) {
-        return String.format("%04x", command.length());
+        return String.format("%04x", command.getBytes().length);
     }
 
     public void send(String command) throws IOException {

test/se/vidstige/jadb/test/integration/ExecuteCmdTests.java

@@ -0,0 +1,100 @@
+package se.vidstige.jadb.test.integration;
+
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import se.vidstige.jadb.JadbConnection;
+import se.vidstige.jadb.JadbDevice;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Collection;
+
+@RunWith(Parameterized.class)
+public class ExecuteCmdTests {
+    private static JadbConnection jadb;
+    private static JadbDevice jadbDevice;
+
+    @Parameterized.Parameter
+    public String input;
+
+
+    @Parameterized.Parameters(name="Test {index} input={0}")
+    public static Collection input() {
+        return Arrays.asList(new Object[]{
+                "öäasd",
+                "asf dsa",
+                "sdf&g",
+                "sd& fg",
+                "da~f",
+                "asd'as",
+                "a¡f",
+                "asüd",
+                "adös tz",
+                "⾀",
+                "å",
+                "æ",
+                "{}"});
+    }
+
+    @BeforeClass
+    public static void connect() {
+        try {
+            jadb = new JadbConnection();
+            jadb.getHostVersion();
+            jadbDevice = jadb.getAnyDevice();
+        } catch (Exception e) {
+            org.junit.Assume.assumeNoException(e);
+        }
+    }
+
+
+    @Test
+    public void testExecuteWithSpecialChars() throws Exception {
+        InputStream response = jadbDevice.execute("echo", input);
+        ResponseReader responseReader = new ResponseReader(response);
+        responseReader.start();
+        responseReader.join(1000L);
+        String ret = responseReader.output;
+        //remove newline
+        ret = ret.replaceAll("\n$", "");
+        Assert.assertEquals(input, ret);
+    }
+
+
+    private class ResponseReader extends Thread {
+        public String output;
+        private InputStream response;
+
+        ResponseReader(InputStream response) {
+            super();
+            this.response = response;
+        }
+
+        @Override
+        public void run() {
+            try {
+                StringBuilder textBuilder = new StringBuilder();
+                try (Reader reader = new BufferedReader(new InputStreamReader
+                        (response, Charset.forName(StandardCharsets.UTF_8.name())))) {
+                    int c = 0;
+                    while ((c = reader.read()) != -1) {
+                        textBuilder.append((char) c);
+                    }
+                }
+                output = textBuilder.toString();
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+}