LowLevel_Test.java

package uk.ac.cam.db538.cryptosms.utils;

import junit.framework.TestCase;
import uk.ac.cam.db538.cryptosms.CustomAsserts;

public class LowLevel_Test extends TestCase {
	
	public void testGetInt() {
		byte[] data;
		long result;
		
		// CONVERSION TESTS
		
		data = new byte[] { 0x01, 0x00, 0x00, 0x00 };
		result = LowLevel.getUnsignedInt(data);
		assertEquals(16777216L, result);
		
		data = new byte[] { 0x00, 0x00, 0x00, 0x01 };
		result = LowLevel.getUnsignedInt(data);
		assertEquals(1L, result);
		
		data = new byte[] { (byte) 0xAB, (byte) 0xCD, (byte) 0xEF, (byte) 0x89 };
		result = LowLevel.getUnsignedInt(data);
		assertEquals(2882400137L, result);
	
		data = new byte[] { (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF };
		result = LowLevel.getUnsignedInt(data);
		assertEquals(4294967295L, result);

		// OFFSET TESTS

		// data somewhere in the bytes
		data = new byte[] { (byte) 0xAB, (byte) 0xCD, (byte) 0xEF, (byte) 0x89, 0x00, 0x00, 0x00, 0x01 };
		result = LowLevel.getUnsignedInt(data, 4);
		assertEquals(1L, result);

		// index greater than limit
		try {
			data = new byte[] { (byte) 0xAB, (byte) 0xCD, (byte) 0xEF, (byte) 0x89, 0x00, 0x00, 0x00, 0x01 };
			result = LowLevel.getUnsignedInt(data, 5);
			assertTrue(false);
		} catch (IndexOutOfBoundsException ex) {
		}
		
		// negative index
		try {
			data = new byte[] { (byte) 0xAB, (byte) 0xCD, (byte) 0xEF, (byte) 0x89, 0x00, 0x00, 0x00, 0x01 };
			result = LowLevel.getUnsignedInt(data, -1);
			assertTrue(false);
		} catch (IndexOutOfBoundsException ex) {
		}
	}
	
	public void testGetBytes() {
		long number;
		byte[] result, expected;
		
		// CONVERSION TESTS
		
		expected = new byte[] { (byte) 0x84, (byte) 0xD2, (byte) 0xC3, (byte) 0x6E };
		number = 2228405102L;
		result = LowLevel.getBytesUnsignedInt(number);
		CustomAsserts.assertArrayEquals(expected, result);
		
		expected = new byte[] { (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF };
		number = 4294967295L;
		result = LowLevel.getBytesUnsignedInt(number);
		CustomAsserts.assertArrayEquals(expected, result);
		
		// unsigned byte
		assertEquals(145, LowLevel.getUnsignedByte((byte)0x91));
		assertEquals(21, LowLevel.getUnsignedByte((byte)0x15));
		assertEquals((byte)0x91, LowLevel.getBytesUnsignedByte(145));
		assertEquals((byte)0x15, LowLevel.getBytesUnsignedByte(21));
	}

}