Mercurial > hg > rlgwebd
annotate shterm.js @ 13:bf7c26d0b66d
webtty: switch upward protocol to JSON
Switch the client-to-server messages from the HTML forms format to
JSON (for the webtty app). Message numbers are sent but not yet used.
author | John "Elwin" Edwards <elwin@sdf.org> |
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date | Sun, 13 May 2012 20:50:13 -0700 |
parents | 9e1d83f50c9e |
children | 155f3c104759 |
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 | |
13
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5 /* The number of the next packet to send. */ |
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6 var nsend = 0; |
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7 |
0
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8 // A state machine that keeps track of polling the server. |
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9 var ajaxstate = { |
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10 state: 0, |
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11 timerID: null, |
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12 clear: function () { |
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13 if (this.timerID != null) { |
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14 window.clearTimeout(this.timerID); |
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15 this.timerID = null; |
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16 } |
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17 }, |
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18 set: function (ms) { |
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19 this.clear(); |
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20 this.timerID = window.setTimeout(getData, ms); |
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21 }, |
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22 gotdata: function () { |
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23 this.set(100); |
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24 this.state = 0; |
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25 }, |
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26 gotnothing: function () { |
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27 if (this.state == 0) { |
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28 this.set(100); |
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29 this.state = 1; |
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30 } |
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31 else if (this.state == 1) { |
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32 this.set(300); |
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33 this.state = 2; |
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34 } |
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35 else if (this.state == 2) { |
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36 this.set(1000); |
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37 this.state = 3; |
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38 } |
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39 else { |
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40 this.set(5000); |
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41 this.state = 3; |
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42 } |
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43 }, |
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44 posted: function () { |
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45 this.set(100); |
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46 this.state = 0; |
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47 } |
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48 }; |
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49 |
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50 function writeData(hexstr) { |
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51 var codenum; |
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52 var codes = []; |
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53 var nc; |
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54 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */ |
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55 var expect = 0; /* The number of 10------ bytes expected. */ |
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56 /* UTF-8 translation. */ |
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57 for (var i = 0; i < hexstr.length; i += 2) { |
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58 nc = Number("0x" + hexstr.substr(i, 2)); |
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59 if (nc < 0x7F) { |
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60 /* 0------- */ |
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61 codes.push(nc); |
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62 /* Any incomplete sequence will be discarded. */ |
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63 u8wait = 0; |
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64 expect = 0; |
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65 } |
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66 else if (nc < 0xC0) { |
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67 /* 10------ : part of a multibyte sequence */ |
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68 if (expect > 0) { |
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69 u8wait <<= 6; |
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70 u8wait += (nc & 0x3F); |
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71 expect--; |
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72 if (expect == 0) { |
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73 codes.push(u8wait); |
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74 u8wait = 0; |
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75 } |
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76 } |
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77 else { |
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78 /* Assume an initial byte was missed. */ |
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79 u8wait = 0; |
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80 } |
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81 } |
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82 /* These will all discard any incomplete sequence. */ |
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83 else if (nc < 0xE0) { |
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84 /* 110----- : introduces 2-byte sequence */ |
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85 u8wait = (nc & 0x1F); |
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86 expect = 1; |
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87 } |
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88 else if (nc < 0xF0) { |