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Retrieve the set of unseen connection numbers from a connection

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This commit is contained in:
akwizgran
2011-08-11 13:58:11 +01:00
parent ac4521152f
commit 0e6638bad6
3 changed files with 69 additions and 8 deletions
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30
components/net/sf/briar/transport/ConnectionWindowImpl.java
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@@ -1,5 +1,8 @@
package net.sf.briar.transport;
import java.util.ArrayList;
import java.util.Collection;
import net.sf.briar.api.transport.ConnectionWindow;
class ConnectionWindowImpl implements ConnectionWindow {
@@ -28,6 +31,15 @@ class ConnectionWindowImpl implements ConnectionWindow {
return (bitmap & mask) != 0;
}
private int getOffset(long connectionNumber) {
if(connectionNumber < 0L) throw new IllegalArgumentException();
if(connectionNumber > MAX_32_BIT_UNSIGNED)
throw new IllegalArgumentException();
int offset = (int) (connectionNumber - centre) + 16;
if(offset < 0 || offset > 31) throw new IllegalArgumentException();
return offset;
}
public void setSeen(long connectionNumber) {
int offset = getOffset(connectionNumber);
int mask = 0x80000000 >>> offset;
@@ -40,12 +52,16 @@ class ConnectionWindowImpl implements ConnectionWindow {
}
}
private int getOffset(long connectionNumber) {
if(connectionNumber < 0L) throw new IllegalArgumentException();
if(connectionNumber > MAX_32_BIT_UNSIGNED)
throw new IllegalArgumentException();
int offset = (int) (connectionNumber - centre) + 16;
if(offset < 0 || offset > 31) throw new IllegalArgumentException();
return offset;
public Collection<Long> getUnseenConnectionNumbers() {
Collection<Long> unseen = new ArrayList<Long>();
for(int i = 0; i < 32; i++) {
int mask = 0x80000000 >>> i;
if((bitmap & mask) == 0) {
long c = centre - 16 + i;
if(c >= 0L && c <= MAX_32_BIT_UNSIGNED) unseen.add(c);
}
}
assert unseen.contains(centre) || centre == MAX_32_BIT_UNSIGNED + 1;
return unseen;
}
}