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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.CharBuffer;
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6 import java.nio.channels.SocketChannel;
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7 import java.nio.charset.CharacterCodingException;
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8 import java.nio.charset.Charset;
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9 import java.nio.charset.CharsetDecoder;
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10 import java.nio.charset.CharsetEncoder;
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11
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12 import rep.channel.REPPack;
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13
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14 /*
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15 //+-------+--------+--------+-------+--------+---------+------+
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16 //| cmd | session| editor | seqid | lineno | textsiz | text |
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17 //| | id | id | | | | |
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18 //+-------+--------+--------+-------+--------+---------+------+
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19 //o-------header section (network order)-------------o
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20 int cmd; // command
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21 int sid; // session ID : uniqu to editing file
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22 int eid; // editor ID : owner editor ID = 1。Session に対して unique
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23 int seqno; // Sequence number : sequence number はエディタごとに管理
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24 int lineno; // line number
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25 int textsize; // textsize : bytesize
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26 byte[] text;
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27 */
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28
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29
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30 public class REPCommandPacker implements REPPack<REPCommand> {
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311
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31 private static final int TEXTSIZELIMIT = 0x7000000;
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312
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32 private static final int HEADER_SIZE = 24;
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33 // JIS/S-JIS = 2, UTF-8 = 3, UTF-?? = 5
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34 private static final int CHARSIZE = 5;
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35 private static final boolean isLogging=false;
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36
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37 Charset charset = Charset.forName("UTF-8");
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38 CharsetEncoder encoder = charset.newEncoder();
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39 CharsetDecoder decoder = charset.newDecoder();
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40
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41 /* (non-Javadoc)
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42 * @see rep.REPPack#packUConv(rep.REPCommand)
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43 */
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44 public ByteBuffer packUConv(REPCommand command){
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45 if (isLogging)
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46 System.out.println("Sending: " + command);
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47 if(command.string == null){
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48 command.setString("");
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49 }
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50 ByteBuffer buffer = ByteBuffer.allocateDirect(HEADER_SIZE+(command.string.length()*CHARSIZE));
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51 buffer.clear(); // position = 0
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52 buffer.putInt(command.cmd.id);
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53 buffer.putInt(command.sid);
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54 buffer.putInt(command.eid);
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55 buffer.putInt(command.seq);
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56 buffer.putInt(command.lineno);
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57
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58 int pos = buffer.position();
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59 buffer.putInt(0);
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60 int pos1 = buffer.position();
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61
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62 //Encode to UTF8
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63 CharBuffer cb = CharBuffer.wrap(command.string);
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64 try {
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65 encoder.encode(cb, buffer, true);
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66 } catch (IllegalStateException e) {
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67 buffer.position(pos1);
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68 }
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69
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70 //Encoded string length set
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71 int length = buffer.position() -pos1 ;
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72 buffer.putInt(pos, length);
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73 buffer.limit(HEADER_SIZE+length);
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74 buffer.rewind();
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75
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76 return buffer;
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77 }
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78
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79
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80 public REPCommand unpackUConv(SocketChannel sc) throws IOException {
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81 ByteBuffer header = ByteBuffer.allocateDirect(HEADER_SIZE);
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82 header.clear();
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83
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84 while(header.remaining()>0){
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85 if (sc.read(header)<0) throw new IOException();
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86 }
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87
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88 header.rewind(); // position = 0
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89
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90 int cmd = header.getInt();
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91 int sid = header.getInt();
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92 int eid = header.getInt();
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93 int seqid = header.getInt();
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94 int lineno = header.getInt();
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95 int textsiz = header.getInt();
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96
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97 if (textsiz>TEXTSIZELIMIT||textsiz<0) {
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98 // corrupted packet
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99 throw new IOException();
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100 }
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101 ByteBuffer textBuffer = ByteBuffer.allocateDirect(textsiz);
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102
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103 while(textBuffer.remaining()>0){
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104 if (sc.read(textBuffer)<0) throw new IOException();
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105 }
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106 textBuffer.rewind();
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107
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108 //Decode UTF-8 to System Encoding(UTF-16)
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109 String string;
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110 try {
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111 CharBuffer cb;
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112 cb = decoder.decode(textBuffer);
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113 cb.rewind();
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114 string = cb.toString();
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115 } catch (CharacterCodingException e) {
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116 string = "";
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117 }
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118 textsiz = string.length();
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119 REPCommand repcommand = new REPCommand(cmd, sid, eid, seqid, lineno, textsiz, string);
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120 if (isLogging)
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121 System.out.println("Reading: "+repcommand);
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122 return repcommand;
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123 }
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124
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125 }
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