87 lines
2.8 KiB
Java
87 lines
2.8 KiB
Java
package protocolP2P;
|
|
import protocolP2P.Payload;
|
|
import protocolP2P.RequestResponseCode;
|
|
import localException.ProtocolError;
|
|
import localException.InternalError;
|
|
import localException.SizeError;
|
|
import localException.TransmissionError;
|
|
import tools.BytesArrayTools;
|
|
|
|
/** Representation of payload for denied response.
|
|
* @author Louis Royer
|
|
* @author Flavien Haas
|
|
* @author JS Auge
|
|
* @version 1.0
|
|
*/
|
|
public class Denied extends Payload {
|
|
private String filename;
|
|
private long offset;
|
|
static final private int OFFSET_POSITION = PAYLOAD_START_POSITION;
|
|
static final private int FILENAME_POSITION = OFFSET_POSITION + 8;
|
|
|
|
/** Constructor (typically used by server) with informations about file part to send as parameters.
|
|
* @param filename name of the file to send
|
|
* @param offset where in the file begins the part we are sending
|
|
* @throws InternalError
|
|
*/
|
|
public Denied(String filename, long offset) throws InternalError {
|
|
super(RequestResponseCode.DENIED);
|
|
/* asserts to help debugging */
|
|
assert offset >= 0 : "offset cannot be negative";
|
|
assert filename != null : "filename is required";
|
|
if (offset < 0 || filename == null) {
|
|
throw new InternalError();
|
|
}
|
|
this.filename = filename;
|
|
this.offset = offset;
|
|
}
|
|
|
|
/** Constructor (typically used by client) with Packet received as parameter.
|
|
* @param packet the full Packet received
|
|
* @throws SizeError
|
|
* @throws InternalError
|
|
* @throws TransmissionError
|
|
*/
|
|
protected Denied(byte[] packet) throws TransmissionError, SizeError, ProtocolError, InternalError {
|
|
super(packet);
|
|
int filenameSize = getPayloadSize(packet) - FILENAME_POSITION + PAYLOAD_START_POSITION;
|
|
offset = BytesArrayTools.readLong(packet, OFFSET_POSITION);
|
|
filename = BytesArrayTools.readString(packet, FILENAME_POSITION, filenameSize);
|
|
}
|
|
|
|
/** Returns a byte[] containing Packet with padding.
|
|
* This Packet is still incomplete and should not be send directly.
|
|
* ProtocolP2PPacket will use this method to generate the complete Packet.
|
|
* @return Packet with padding
|
|
* @throws InternalError
|
|
*/
|
|
protected byte[] toPacket() throws InternalError {
|
|
// compute total size
|
|
int size = FILENAME_POSITION + filename.length();
|
|
byte[] packet = new byte[size]; // java initialize all to zero
|
|
// set request/response code
|
|
packet[RequestResponseCode.RRCODE_POSITION] = requestResponseCode.codeValue;
|
|
// set Payload size
|
|
setPayloadSize(size - PAYLOAD_START_POSITION, packet);
|
|
// write offset to Packet
|
|
BytesArrayTools.write(packet, OFFSET_POSITION, offset);
|
|
// write filename to Packet
|
|
BytesArrayTools.write(packet, filename, FILENAME_POSITION);
|
|
return packet;
|
|
}
|
|
|
|
/** filename getter.
|
|
* @return String
|
|
*/
|
|
public String getFilename() {
|
|
return filename;
|
|
}
|
|
|
|
/** offset getter.
|
|
* @return offset
|
|
*/
|
|
public long getOffset() {
|
|
return offset;
|
|
}
|
|
}
|