add APDUCommand class and test

app/src/main/java/im/status/applet_installer_test/appletinstaller/APDUCommand.java

@@ -0,0 +1,39 @@
+package im.status.applet_installer_test.appletinstaller;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+public class APDUCommand {
+    protected int cla;
+    protected int ins;
+    protected int p1;
+    protected int p2;
+    protected int lc;
+    protected byte[] data;
+
+    public APDUCommand(int cla, int ins, int p1, int p2, byte[] data) {
+        this.cla = cla;
+        this.ins = ins;
+        this.p1 = p1;
+        this.p2 = p2;
+        this.data = data;
+    }
+
+    public byte[] serialize() throws IOException {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        out.write(this.cla);
+        out.write(this.ins);
+        out.write(this.p1);
+        out.write(this.p2);
+
+        int lc = this.data.length;
+        if (lc > 0) {
+            out.write(lc);
+            out.write(this.data);
+        }
+
+        out.write(0); // Response length
+
+        return out.toByteArray();
+    }
+}

app/src/main/java/im/status/applet_installer_test/appletinstaller/HexUtils.java

@@ -0,0 +1,30 @@
+package im.status.applet_installer_test.appletinstaller;
+
+
+public class HexUtils {
+    public static byte[] hexStringToByteArray(String s) {
+        int len = s.length();
+        byte[] data = new byte[len/2];
+
+        for(int i = 0; i < len; i+=2){
+            data[i/2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i+1), 16));
+        }
+
+        return data;
+    }
+
+    final protected static char[] hexArray = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
+
+    public static String byteArrayToHexString(byte[] bytes) {
+        char[] hexChars = new char[bytes.length * 2];
+        int v;
+
+        for(int j=0; j < bytes.length; j++) {
+            v = bytes[j] & 0xFF;
+            hexChars[j * 2] = hexArray[v>>>4];
+            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
+        }
+
+        return new String(hexChars);
+    }
+}

app/src/test/java/im/status/applet_installer_test/appletinstaller/APDUCommandTest.java

@@ -0,0 +1,24 @@
+package im.status.applet_installer_test.appletinstaller;
+
+import org.junit.Test;
+
+import java.io.IOException;
+
+import static org.junit.Assert.*;
+
+public class APDUCommandTest {
+    @Test
+    public void serialize() throws IOException {
+        int cla = 0x80;
+        int ins = 0x50;
+        int p1 = 0;
+        int p2 = 0;
+        byte[] data = HexUtils.hexStringToByteArray("84762336c5187fe8");
+
+        APDUCommand c = new APDUCommand(cla, ins, p1, p2, (byte[])data);
+
+        String expected = "805000000884762336C5187FE800";
+        String actual = HexUtils.byteArrayToHexString(c.serialize());
+        assertEquals(expected, actual);
+    }
+}