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1 package rep;
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2
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3 import java.io.IOException;
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4 import java.nio.ByteBuffer;
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5 import java.nio.channels.SocketChannel;
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6
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7 public class REPPacketReceive {
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8
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9 SocketChannel socketchannel;
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10 private int HEADER_SIZE = 24;
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11
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12 public REPPacketReceive(SocketChannel sc){
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13 socketchannel = sc;
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14 }
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15
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16
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17 public REPCommand unpack() {
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18
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19 ByteBuffer header = ByteBuffer.allocateDirect(HEADER_SIZE);
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20 long len = 0;
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21 header.clear();
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22 try {
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23 len = socketchannel.read(header);
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24 if(len == -1){
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25 socketchannel.close();
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26 return null;
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27 }else if(len == 0){
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28 return null;
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29 }
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30 } catch (IOException e1) {
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31 e1.printStackTrace();
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32 } // limit = read length
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33 if (len !=HEADER_SIZE) {
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34 System.out.println("‚Ä‚·");
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35 // this can't happen
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36 }
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37 header.rewind(); // position = 0
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38
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39 String text = "";
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40 int cmd = header.getInt();
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41 int sid = header.getInt();
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42 int eid = header.getInt();
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43 int seqid = header.getInt();
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44 int lineno = header.getInt();
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45 int textsiz = header.getInt()/2;
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46
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47 ByteBuffer textBuffer = ByteBuffer.allocateDirect(textsiz*2);
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48
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49 try {
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50 len = socketchannel.read(textBuffer);
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51 } catch (IOException e1) {
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52 e1.printStackTrace();
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53 } // limit = read length
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54 if (len != textsiz * 2) {
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55 // this can't happen
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56 System.out.println("‚ ‚Æ");
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57 }
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58 textBuffer.rewind();
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59 for(int i=0;i<textsiz;i++) {
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60 text +=textBuffer.getChar();
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61 }
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62 String string = text;
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63 //System.out.println(string);
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64 REPCommand repcommand = new REPCommand(cmd, sid, eid, seqid, lineno, textsiz, string);
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65 System.out.println("received command: " + repcommand.toString());
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66 return repcommand;
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67 }
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68 }
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