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Tests and bugfixes for XorErasureDecoder.

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akwizgran
2012-01-20 17:02:17 +00:00
parent 2b737e7e53
commit 74dd4e277f
3 changed files with 69 additions and 1 deletions
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67
test/net/sf/briar/transport/XorErasureDecoderTest.java Normal file
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package net.sf.briar.transport;
import static net.sf.briar.api.transport.TransportConstants.FRAME_HEADER_LENGTH;
import static net.sf.briar.api.transport.TransportConstants.MAC_LENGTH;
import static net.sf.briar.api.transport.TransportConstants.MAX_FRAME_LENGTH;
import net.sf.briar.BriarTestCase;
import net.sf.briar.api.FormatException;
import net.sf.briar.api.transport.Segment;
import static org.junit.Assert.assertArrayEquals;
import org.junit.Test;
public class XorErasureDecoderTest extends BriarTestCase {
@Test
public void testMaximumLength() throws Exception {
// A frame of the maximum length should be decoded successfully
Segment[] set = encodeEmptyFrame(MAX_FRAME_LENGTH / 4, 5);
XorErasureDecoder d = new XorErasureDecoder(5);
Frame f = new Frame();
assertTrue(d.decodeFrame(f, set));
// Check the header
byte[] b = f.getBuffer();
assertEquals(0L, HeaderEncoder.getFrameNumber(b));
int payload = MAX_FRAME_LENGTH - FRAME_HEADER_LENGTH - MAC_LENGTH;
assertEquals(payload, HeaderEncoder.getPayloadLength(b));
assertEquals(0, HeaderEncoder.getPaddingLength(b));
// Check the body
assertEquals(MAX_FRAME_LENGTH, f.getLength());
for(int i = FRAME_HEADER_LENGTH; i < MAX_FRAME_LENGTH; i++) {
assertEquals(0, b[i]);
}
// A frame larger than the maximum length should not be decoded
set = encodeEmptyFrame(MAX_FRAME_LENGTH / 4 + 1, 5);
try {
d.decodeFrame(f, set);
} catch(FormatException expected) {}
}
@Test
public void testMinimumLengthIsUsed() throws Exception {
Segment[] set = encodeEmptyFrame(250, 4);
// Replace one of the pieces with a longer piece
byte[] b = set[1].getBuffer();
assertArrayEquals(new byte[250], b);
set[1] = new SegmentImpl(251);
set[1].setLength(251);
// The frame should be decoded successfully
XorErasureDecoder d = new XorErasureDecoder(4);
Frame f = new Frame();
assertTrue(d.decodeFrame(f, set));
// The minimum of the segments' lengths should have been used
assertEquals(750, f.getLength());
}
private Segment[] encodeEmptyFrame(int length, int n) {
Segment[] set = new Segment[n];
for(int i = 0; i < n; i++) {
set[i] = new SegmentImpl(length);
set[i].setLength(length);
}
int payload = length * (n - 1) - FRAME_HEADER_LENGTH - MAC_LENGTH;
HeaderEncoder.encodeHeader(set[0].getBuffer(), 0L, payload, 0);
HeaderEncoder.encodeHeader(set[n - 1].getBuffer(), 0L, payload, 0);
return set;
}
}