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42 lines
1.3 KiB
Java
42 lines
1.3 KiB
Java
package net.sf.briar.transport;
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import static org.junit.Assert.assertArrayEquals;
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import net.sf.briar.BriarTestCase;
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import net.sf.briar.api.transport.Segment;
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import org.junit.Test;
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public class XorErasureEncoderTest extends BriarTestCase {
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@Test
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public void testEncoding() {
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// Create a 100-byte frame
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Frame f = new Frame();
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f.setLength(100);
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byte[] b = f.getBuffer();
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for(int i = 0; i < 100; i++) b[i] = (byte) i;
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// Encode the frame
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XorErasureEncoder e = new XorErasureEncoder(4);
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Segment[] set = e.encodeFrame(f);
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// There should be four pieces of 34 bytes each
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assertEquals(4, set.length);
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for(int i = 0; i < 4; i++) assertEquals(34, set[i].getLength());
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// The first three pieces should contain the data, plus two zero bytes
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byte[] b1 = set[0].getBuffer();
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for(int i = 0; i < 34; i++) assertEquals(i, b1[i]);
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byte[] b2 = set[1].getBuffer();
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for(int i = 0; i < 34; i++) assertEquals(i + 34, b2[i]);
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byte[] b3 = set[2].getBuffer();
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for(int i = 0; i < 32; i++) assertEquals(i + 68, b3[i]);
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assertEquals(0, b3[32]);
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assertEquals(0, b3[33]);
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// The fourth piece should be the XOR of the other three
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byte[] b4 = set[3].getBuffer();
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byte[] expected = new byte[34];
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for(int i = 0; i < 34; i++) {
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expected[i] = (byte) (b1[i] ^ b2[i] ^ b3[i]);
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}
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assertArrayEquals(expected, b4);
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}
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}
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