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Convert connection windows to and from bitmaps.

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This commit is contained in:
akwizgran
2012-10-13 23:59:11 +01:00
parent 7739bcdd06
commit 79c3ef572d
2 changed files with 56 additions and 11 deletions
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34
test/net/sf/briar/transport/ConnectionWindowTest.java
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@@ -1,5 +1,9 @@
package net.sf.briar.transport;
import static net.sf.briar.api.transport.TransportConstants.CONNECTION_WINDOW_SIZE;
import static net.sf.briar.util.ByteUtils.MAX_32_BIT_UNSIGNED;
import static org.junit.Assert.assertArrayEquals;
import java.util.Collection;
import net.sf.briar.BriarTestCase;
@@ -40,6 +44,29 @@ public class ConnectionWindowTest extends BriarTestCase {
w.setSeen(48);
fail();
} catch(IllegalArgumentException expected) {}
// Centre is max - 1, highest value in window is max
byte[] bitmap = new byte[CONNECTION_WINDOW_SIZE / 8];
w = new ConnectionWindow(MAX_32_BIT_UNSIGNED - 1, bitmap);
assertFalse(w.isSeen(MAX_32_BIT_UNSIGNED - 1));
assertFalse(w.isSeen(MAX_32_BIT_UNSIGNED));
// Values greater than max should never be allowed
try {
w.setSeen(MAX_32_BIT_UNSIGNED + 1);
fail();
} catch(IllegalArgumentException expected) {}
w.setSeen(MAX_32_BIT_UNSIGNED);
assertTrue(w.isSeen(MAX_32_BIT_UNSIGNED));
// Centre should have moved to max + 1
assertEquals(MAX_32_BIT_UNSIGNED + 1, w.getCentre());
// The bit corresponding to max should be set
byte[] expectedBitmap = new byte[CONNECTION_WINDOW_SIZE / 8];
expectedBitmap[expectedBitmap.length / 2 - 1] = 1; // 00000001
assertArrayEquals(expectedBitmap, w.getBitmap());
// Values greater than max should never be allowed even if centre > max
try {
w.setSeen(MAX_32_BIT_UNSIGNED + 1);
fail();
} catch(IllegalArgumentException expected) {}
}
@Test
@@ -70,6 +97,13 @@ public class ConnectionWindowTest extends BriarTestCase {
w.setSeen(9);
fail();
} catch(IllegalArgumentException expected) {}
// Centre should still be 26
assertEquals(26, w.getCentre());
// The bits corresponding to 10, 15, 16 and 25 should be set
byte[] expectedBitmap = new byte[CONNECTION_WINDOW_SIZE / 8];
expectedBitmap[0] = (byte) 134; // 10000110
expectedBitmap[1] = 1; // 00000001
assertArrayEquals(expectedBitmap, w.getBitmap());
}
@Test