Mercurial > hg > rlgwebd
annotate shterm.js @ 141:1a156a7746a7
RLGWebD: use NODE_PATH to find modules.
author | John "Elwin" Edwards |
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date | Wed, 14 Aug 2013 08:04:36 -0700 |
parents | 789c094675f4 |
children | c4a32007d2dc |
rev | line source |
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1 | 1 /* shterm.js: browser-side JavaScript to handle I/O for termemu.js when it |
2 * is running a shell via the webtty.js server. | |
3 */ | |
4 | |
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5 var isalive = false; // Whether the session is currently active. |
14
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6 var nsend = 0; // The number of the next packet to send. |
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7 var nrecv = 0; // The next packet expected. |
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8 var msgQ = []; // Queue for out-of-order messages. |
140 | 9 var conn = null; // WebSocket |
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10 |
0
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11 // A state machine that keeps track of polling the server. |
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12 var ajaxstate = { |
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13 state: 0, |
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14 timerID: null, |
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15 clear: function () { |
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16 if (this.timerID != null) { |
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17 window.clearTimeout(this.timerID); |
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18 this.timerID = null; |
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19 } |
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20 }, |
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21 set: function (ms) { |
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22 this.clear(); |
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23 this.timerID = window.setTimeout(getData, ms); |
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24 }, |
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25 gotdata: function () { |
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26 this.set(100); |
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27 this.state = 0; |
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28 }, |
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29 gotnothing: function () { |
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30 if (this.state == 0) { |
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31 this.set(100); |
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32 this.state = 1; |
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33 } |
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34 else if (this.state == 1) { |
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35 this.set(300); |
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36 this.state = 2; |
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37 } |
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38 else if (this.state == 2) { |
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39 this.set(1000); |
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40 this.state = 3; |
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41 } |
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42 else { |
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43 this.set(5000); |
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44 this.state = 3; |
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45 } |
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46 }, |
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47 posted: function () { |
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48 this.set(100); |
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49 this.state = 0; |
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50 } |
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51 }; |
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52 |
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53 function writeData(hexstr) { |
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54 var codenum; |
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55 var codes = []; |
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56 var nc; |
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57 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */ |
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58 var expect = 0; /* The number of 10------ bytes expected. */ |
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59 /* UTF-8 translation. */ |
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60 for (var i = 0; i < hexstr.length; i += 2) { |
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61 nc = Number("0x" + hexstr.substr(i, 2)); |
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62 if (nc < 0x7F) { |
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63 /* 0------- */ |
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64 codes.push(nc); |
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65 /* Any incomplete sequence will be discarded. */ |
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66 u8wait = 0; |
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67 expect = 0; |
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68 } |
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69 else if (nc < 0xC0) { |
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70 /* 10------ : part of a multibyte sequence */ |
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71 if (expect > 0) { |
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72 u8wait <<= 6; |
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73 u8wait += (nc & 0x3F); |
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74 expect--; |
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75 if (expect == 0) { |
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76 codes.push(u8wait); |
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77 u8wait = 0; |
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78 } |
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79 } |
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80 else { |
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81 /* Assume an initial byte was missed. */ |
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82 u8wait = 0; |
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83 } |
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84 } |
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85 /* These will all discard any incomplete sequence. */ |
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86 else if (nc < 0xE0) { |
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87 /* 110----- : introduces 2-byte sequence */ |
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88 u8wait = (nc & 0x1F); |