forked from I2P_Developers/i2p.i2p
beginning of branch i2p.i2p.i2p
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cvs_import
274
router/java/src/net/i2p/data/i2np/DeliveryInstructions.java
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274
router/java/src/net/i2p/data/i2np/DeliveryInstructions.java
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package net.i2p.data.i2np;
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/*
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* free (adj.): unencumbered; not under the control of others
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* Written by jrandom in 2003 and released into the public domain
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* with no warranty of any kind, either expressed or implied.
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* It probably won't make your computer catch on fire, or eat
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* your children, but it might. Use at your own risk.
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*
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*/
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import net.i2p.util.Log;
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import net.i2p.data.DataHelper;
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import net.i2p.data.DataStructureImpl;
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import net.i2p.data.DataFormatException;
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import net.i2p.data.Hash;
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import net.i2p.data.SessionKey;
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import net.i2p.data.TunnelId;
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/**
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* Contains the delivery instructions
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*
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* @author jrandom
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*/
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public class DeliveryInstructions extends DataStructureImpl {
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private final static Log _log = new Log(DeliveryInstructions.class);
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private boolean _encrypted;
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private SessionKey _encryptionKey;
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private int _deliveryMode;
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public final static int DELIVERY_MODE_LOCAL = 0;
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public final static int DELIVERY_MODE_DESTINATION = 1;
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public final static int DELIVERY_MODE_ROUTER = 2;
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public final static int DELIVERY_MODE_TUNNEL = 3;
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private Hash _destinationHash;
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private Hash _routerHash;
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private TunnelId _tunnelId;
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private boolean _delayRequested;
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private long _delaySeconds;
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private final static int FLAG_MODE_LOCAL = 0;
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private final static int FLAG_MODE_DESTINATION = 1;
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private final static int FLAG_MODE_ROUTER = 2;
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private final static int FLAG_MODE_TUNNEL = 3;
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private final static long FLAG_ENCRYPTED = 128;
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private final static long FLAG_MODE = 96;
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private final static long FLAG_DELAY = 16;
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public DeliveryInstructions() {
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setEncrypted(false);
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setEncryptionKey(null);
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setDeliveryMode(-1);
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setDestination(null);
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setRouter(null);
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setTunnelId(null);
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setDelayRequested(false);
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setDelaySeconds(0);
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}
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public boolean getEncrypted() { return _encrypted; }
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public void setEncrypted(boolean encrypted) { _encrypted = encrypted; }
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public SessionKey getEncryptionKey() { return _encryptionKey; }
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public void setEncryptionKey(SessionKey key) { _encryptionKey = key; }
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public int getDeliveryMode() { return _deliveryMode; }
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public void setDeliveryMode(int mode) { _deliveryMode = mode; }
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public Hash getDestination() { return _destinationHash; }
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public void setDestination(Hash dest) { _destinationHash = dest; }
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public Hash getRouter() { return _routerHash; }
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public void setRouter(Hash router) { _routerHash = router; }
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public TunnelId getTunnelId() { return _tunnelId; }
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public void setTunnelId(TunnelId id) { _tunnelId = id; }
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public boolean getDelayRequested() { return _delayRequested; }
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public void setDelayRequested(boolean req) { _delayRequested = req; }
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public long getDelaySeconds() { return _delaySeconds; }
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public void setDelaySeconds(long seconds) { _delaySeconds = seconds; }
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public void readBytes(InputStream in) throws DataFormatException, IOException {
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long flags = DataHelper.readLong(in, 1);
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_log.debug("Read flags: " + flags + " mode: " + flagMode(flags));
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if (flagEncrypted(flags)) {
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SessionKey k = new SessionKey();
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k.readBytes(in);
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setEncryptionKey(k);
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setEncrypted(true);
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} else {
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setEncrypted(false);
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}
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setDeliveryMode(flagMode(flags));
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switch (flagMode(flags)) {
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case FLAG_MODE_LOCAL:
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break;
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case FLAG_MODE_DESTINATION:
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Hash destHash = new Hash();
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destHash.readBytes(in);
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setDestination(destHash);
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break;
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case FLAG_MODE_ROUTER:
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Hash routerHash = new Hash();
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routerHash.readBytes(in);
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setRouter(routerHash);
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break;
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case FLAG_MODE_TUNNEL:
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Hash tunnelRouterHash = new Hash();
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tunnelRouterHash.readBytes(in);
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setRouter(tunnelRouterHash);
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TunnelId id = new TunnelId();
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id.readBytes(in);
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setTunnelId(id);
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break;
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}
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if (flagDelay(flags)) {
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long delay = DataHelper.readLong(in, 4);
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setDelayRequested(true);
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setDelaySeconds(delay);
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} else {
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setDelayRequested(false);
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}
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}
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private boolean flagEncrypted(long flags) {
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return (0 != (flags & FLAG_ENCRYPTED));
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}
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private int flagMode(long flags) {
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long v = flags & FLAG_MODE;
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v >>>= 5;
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return (int)v;
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}
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private boolean flagDelay(long flags) {
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return (0 != (flags & FLAG_DELAY));
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}
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private long getFlags() {
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long val = 0L;
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if (getEncrypted())
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val = val | FLAG_ENCRYPTED;
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long fmode = 0;
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switch (getDeliveryMode()) {
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case FLAG_MODE_LOCAL:
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break;
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case FLAG_MODE_DESTINATION:
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fmode = FLAG_MODE_DESTINATION << 5;
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break;
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case FLAG_MODE_ROUTER:
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fmode = FLAG_MODE_ROUTER << 5;
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break;
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case FLAG_MODE_TUNNEL:
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fmode = FLAG_MODE_TUNNEL << 5;
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break;
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}
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val = val | fmode;
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if (getDelayRequested())
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val = val | FLAG_DELAY;
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_log.debug("getFlags() = " + val);
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return val;
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}
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private byte[] getAdditionalInfo() throws DataFormatException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream(64);
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try {
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if (getEncrypted()) {
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if (_encryptionKey == null) throw new DataFormatException("Encryption key is not set");
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_encryptionKey.writeBytes(baos);
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_log.debug("IsEncrypted");
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} else {
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_log.debug("Is NOT Encrypted");
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}
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switch (getDeliveryMode()) {
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case FLAG_MODE_LOCAL:
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_log.debug("mode = local");
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break;
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case FLAG_MODE_DESTINATION:
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if (_destinationHash == null) throw new DataFormatException("Destination hash is not set");
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_destinationHash.writeBytes(baos);
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_log.debug("mode = destination, hash = " + _destinationHash);
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break;
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case FLAG_MODE_ROUTER:
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if (_routerHash == null) throw new DataFormatException("Router hash is not set");
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_routerHash.writeBytes(baos);
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_log.debug("mode = router, routerHash = " + _routerHash);
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break;
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case FLAG_MODE_TUNNEL:
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if ( (_routerHash == null) || (_tunnelId == null) ) throw new DataFormatException("Router hash or tunnel ID is not set");
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_routerHash.writeBytes(baos);
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_tunnelId.writeBytes(baos);
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_log.debug("mode = tunnel, tunnelId = " + _tunnelId.getTunnelId() + ", routerHash = " + _routerHash);
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break;
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}
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if (getDelayRequested()) {
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_log.debug("delay requested: " + getDelaySeconds());
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DataHelper.writeLong(baos, 4, getDelaySeconds());
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} else {
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_log.debug("delay NOT requested");
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}
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} catch (IOException ioe) {
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throw new DataFormatException("Unable to write out additional info", ioe);
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}
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return baos.toByteArray();
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}
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public void writeBytes(OutputStream out) throws DataFormatException, IOException {
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if ( (_deliveryMode < 0) || (_deliveryMode > FLAG_MODE_TUNNEL) ) throw new DataFormatException("Invalid data: mode = " + _deliveryMode);
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long flags = getFlags();
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_log.debug("Write flags: " + flags + " mode: " + getDeliveryMode() + " =?= " + flagMode(flags));
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byte additionalInfo[] = getAdditionalInfo();
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DataHelper.writeLong(out, 1, flags);
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if (additionalInfo != null) {
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out.write(additionalInfo);
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out.flush();
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}
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}
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public boolean equals(Object obj) {
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if ( (obj == null) || !(obj instanceof DeliveryInstructions))
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return false;
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DeliveryInstructions instr = (DeliveryInstructions)obj;
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return (getDelayRequested() == instr.getDelayRequested()) &&
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(getDelaySeconds() == instr.getDelaySeconds()) &&
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(getDeliveryMode() == instr.getDeliveryMode()) &&
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(getEncrypted() == instr.getEncrypted()) &&
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DataHelper.eq(getDestination(), instr.getDestination()) &&
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DataHelper.eq(getEncryptionKey(), instr.getEncryptionKey()) &&
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DataHelper.eq(getRouter(), instr.getRouter()) &&
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DataHelper.eq(getTunnelId(), instr.getTunnelId());
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}
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public int hashCode() {
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return (int)getDelaySeconds() +
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getDeliveryMode() +
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DataHelper.hashCode(getDestination()) +
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DataHelper.hashCode(getEncryptionKey()) +
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DataHelper.hashCode(getRouter()) +
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DataHelper.hashCode(getTunnelId());
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}
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public String toString() {
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StringBuffer buf = new StringBuffer(128);
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buf.append("[DeliveryInstructions: ");
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buf.append("\n\tDelivery mode: ");
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switch (getDeliveryMode()) {
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case DELIVERY_MODE_LOCAL:
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buf.append("local");
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break;
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case DELIVERY_MODE_DESTINATION:
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buf.append("destination");
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break;
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case DELIVERY_MODE_ROUTER:
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buf.append("router");
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break;
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case DELIVERY_MODE_TUNNEL:
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buf.append("tunnel");
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break;
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}
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buf.append("\n\tDelay requested: ").append(getDelayRequested());
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buf.append("\n\tDelay seconds: ").append(getDelaySeconds());
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buf.append("\n\tDestination: ").append(getDestination());
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buf.append("\n\tEncrypted: ").append(getEncrypted());
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buf.append("\n\tEncryption key: ").append(getEncryptionKey());
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buf.append("\n\tRouter: ").append(getRouter());
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buf.append("\n\tTunnelId: ").append(getTunnelId());
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return buf.toString();
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}
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}
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