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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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31 private static final int TEXTSIZELIMIT = 0x7000000;
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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
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36 Charset charset = Charset.forName("UTF-8");
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37 CharsetEncoder encoder = charset.newEncoder();
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38 CharsetDecoder decoder = charset.newDecoder();
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39
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40 /* (non-Javadoc)
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41 * @see rep.REPPack#packUConv(rep.REPCommand)
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42 */
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43 public ByteBuffer packUConv(REPCommand command){
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44 int size = 0;
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45 if (command.string!=null) size = command.string.length()*CHARSIZE;
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46 ByteBuffer buffer = ByteBuffer.allocateDirect(HEADER_SIZE+size);
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47 buffer.clear(); // position = 0
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48 buffer.putInt(command.cmd.id);
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49 buffer.putInt(command.sid);
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50 buffer.putInt(command.eid);
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51 buffer.putInt(command.seq);
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52 buffer.putInt(command.lineno);
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53
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54 int pos = buffer.position();
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55 buffer.putInt(0);
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56 int pos1 = buffer.position();
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57
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58 if (command.string!=null) {
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59 //Encode to UTF8
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60 CharBuffer cb = CharBuffer.wrap(command.string);
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61 try {
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62 encoder.encode(cb, buffer, true);
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63 } catch (IllegalStateException e) {
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64 buffer.position(pos1);
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65 }
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66 }
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67
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68 //Encoded string length set
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69 int length = buffer.position() -pos1 ;
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70 buffer.putInt(pos, length);
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71 buffer.limit(HEADER_SIZE+length);
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72 buffer.rewind();
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73
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74 return buffer;
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75 }
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76
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77
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78 public REPCommand unpackUConv(SocketChannel sc) throws IOException {
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79 ByteBuffer header = ByteBuffer.allocateDirect(HEADER_SIZE);
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80 header.clear();
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81
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82 while(header.remaining()>0){
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83 if (sc.read(header)<0) throw new IOException();
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84 }
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85
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86 header.rewind(); // position = 0
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87
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88 int cmd = header.getInt();
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89 int sid = header.getInt();
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90 int eid = header.getInt();
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91 int seqid = header.getInt();
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92 int lineno = header.getInt();
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93 int textsiz = header.getInt();
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203
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94
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95 /**
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96 * We should avoid large reading here. Large command should be
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97 * broke in smaller one. It should be easy.
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98 */
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193
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99 if (textsiz>TEXTSIZELIMIT||textsiz<0) {
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100 // corrupted packet
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101 throw new IOException();
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102 }
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103 ByteBuffer textBuffer = ByteBuffer.allocateDirect(textsiz);
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104
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105 while(textBuffer.remaining()>0){
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106 if (sc.read(textBuffer)<0) throw new IOException();
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107 }
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108 textBuffer.rewind();
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109
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110 //Decode UTF-8 to System Encoding(UTF-16)
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111 String string;
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112 try {
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113 CharBuffer cb;
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114 cb = decoder.decode(textBuffer);
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115 cb.rewind();
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116 string = cb.toString();
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117 } catch (CharacterCodingException e) {
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118 string = "";
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119 }
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120 textsiz = string.length();
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121 REPCommand repcommand = new REPCommand(cmd, sid, eid, seqid, lineno, textsiz, string);
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122 //if (isLogging)
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123 //System.out.println("Reading: "+repcommand);
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124 return repcommand;
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125 }
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126
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127 }
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