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Expose the encryption and authentication overhead without breaking

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encapsulation.

This should allow callers to calculate maximum packet sizes without
knowing the details of the transport protocol.
This commit is contained in:
akwizgran
2011-09-21 15:22:25 +01:00
parent 7e58b25618
commit 10c3b21726
10 changed files with 115 additions and 35 deletions
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28
test/net/sf/briar/transport/ConnectionWriterImplTest.java
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@@ -100,4 +100,32 @@ public class ConnectionWriterImplTest extends TransportTest {
byte[] actual = out.toByteArray();
assertTrue(Arrays.equals(expected, actual));
}
@Test
public void testGetCapacity() throws Exception {
int overheadPerFrame = 4 + mac.getMacLength();
ByteArrayOutputStream out = new ByteArrayOutputStream();
ConnectionEncrypter e = new NullConnectionEncrypter(out);
ConnectionWriterImpl w = new ConnectionWriterImpl(e, mac);
// Full frame
long capacity = w.getCapacity(MAX_FRAME_LENGTH);
assertEquals(MAX_FRAME_LENGTH - overheadPerFrame, capacity);
// Partial frame
capacity = w.getCapacity(overheadPerFrame + 1);
assertEquals(1, capacity);
// Full frame and partial frame
capacity = w.getCapacity(MAX_FRAME_LENGTH + 1);
assertEquals(MAX_FRAME_LENGTH + 1 - 2 * overheadPerFrame, capacity);
// Buffer some output
w.getOutputStream().write(0);
// Full frame minus buffered frame
capacity = w.getCapacity(MAX_FRAME_LENGTH);
assertEquals(MAX_FRAME_LENGTH - 1 - 2 * overheadPerFrame, capacity);
// Flush the buffer
w.flush();
assertEquals(1 + overheadPerFrame, out.size());
// Back to square one
capacity = w.getCapacity(MAX_FRAME_LENGTH);
assertEquals(MAX_FRAME_LENGTH - overheadPerFrame, capacity);
}
}

4
test/net/sf/briar/transport/NullConnectionEncrypter.java
View File

@@ -19,4 +19,8 @@ class NullConnectionEncrypter implements ConnectionEncrypter {
public void writeMac(byte[] mac) throws IOException {
out.write(mac);
}
public long getCapacity(long capacity) {
return capacity;
}
}

28
test/net/sf/briar/transport/PaddedConnectionWriterTest.java
View File

@@ -160,4 +160,32 @@ public class PaddedConnectionWriterTest extends TransportTest {
assertEquals(1, ByteUtils.readUint16(frame, 0)); // Payload length
assertEquals(maxPayloadLength - 1, ByteUtils.readUint16(frame, 2));
}
@Test
public void testGetCapacity() throws Exception {
int overheadPerFrame = 4 + mac.getMacLength();
ByteArrayOutputStream out = new ByteArrayOutputStream();
ConnectionEncrypter e = new NullConnectionEncrypter(out);
PaddedConnectionWriter w = new PaddedConnectionWriter(e, mac);
// Full frame
long capacity = w.getCapacity(MAX_FRAME_LENGTH);
assertEquals(MAX_FRAME_LENGTH - overheadPerFrame, capacity);
// Partial frame
capacity = w.getCapacity(overheadPerFrame + 1);
assertEquals(1, capacity);
// Full frame and partial frame
capacity = w.getCapacity(MAX_FRAME_LENGTH + 1);
assertEquals(MAX_FRAME_LENGTH + 1 - 2 * overheadPerFrame, capacity);
// Buffer some output
w.getOutputStream().write(0);
// Full frame minus buffered frame
capacity = w.getCapacity(MAX_FRAME_LENGTH);
assertEquals(MAX_FRAME_LENGTH - 1 - 2 * overheadPerFrame, capacity);
// Flush the buffer
w.writeFullFrame();
assertEquals(MAX_FRAME_LENGTH, out.size());
// Back to square one
capacity = w.getCapacity(MAX_FRAME_LENGTH);
assertEquals(MAX_FRAME_LENGTH - overheadPerFrame, capacity);
}
}