85 lines
2.7 KiB
Java
85 lines
2.7 KiB
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.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import net.i2p.data.DataFormatException;
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import net.i2p.data.DataHelper;
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import net.i2p.util.Log;
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/**
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* Defines a message containing arbitrary bytes of data
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*
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* @author jrandom
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*/
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public class DataMessage extends I2NPMessageImpl {
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private final static Log _log = new Log(DataMessage.class);
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public final static int MESSAGE_TYPE = 20;
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private byte _data[];
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public DataMessage() {
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_data = null;
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}
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public byte[] getData() { return _data; }
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public void setData(byte data[]) { _data = data; }
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public int getSize() { return _data.length; }
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public void readMessage(InputStream in, int type) throws I2NPMessageException, IOException {
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if (type != MESSAGE_TYPE) throw new I2NPMessageException("Message type is incorrect for this message");
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try {
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int size = (int)DataHelper.readLong(in, 4);
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_data = new byte[size];
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int read = read(in, _data);
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if (read != size)
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throw new DataFormatException("Not enough bytes to read (read = " + read + ", expected = " + size + ")");
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} catch (DataFormatException dfe) {
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throw new I2NPMessageException("Unable to load the message data", dfe);
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}
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}
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protected byte[] writeMessage() throws I2NPMessageException, IOException {
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ByteArrayOutputStream os = new ByteArrayOutputStream((_data != null ? _data.length + 4 : 4));
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try {
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DataHelper.writeLong(os, 4, (_data != null ? _data.length : 0));
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os.write(_data);
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} catch (DataFormatException dfe) {
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throw new I2NPMessageException("Error writing out the message data", dfe);
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}
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return os.toByteArray();
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}
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public int getType() { return MESSAGE_TYPE; }
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public int hashCode() {
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return DataHelper.hashCode(getData());
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}
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public boolean equals(Object object) {
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if ( (object != null) && (object instanceof DataMessage) ) {
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DataMessage msg = (DataMessage)object;
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return DataHelper.eq(getData(),msg.getData());
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} else {
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return false;
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}
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}
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public String toString() {
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StringBuffer buf = new StringBuffer();
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buf.append("[DataMessage: ");
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buf.append("\n\tData: ").append(DataHelper.toString(getData(), 64));
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buf.append("]");
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return buf.toString();
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}
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}
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