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annotate shterm.js @ 145:3308eaa00c91

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Use SVG for the bell icon instead of PNG. Browsers that support WebSockets tend to support SVG too. This also removes the need to install Inkscape to convert the file to PNG.
author John "Elwin" Edwards
date Thu, 31 Oct 2013 20:44:35 -0700
parents 789c094675f4
children c4a32007d2dc
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1
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1 /* shterm.js: browser-side JavaScript to handle I/O for termemu.js when it
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2 * is running a shell via the webtty.js server.
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3 */
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4
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5 var isalive = false; // Whether the session is currently active.
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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.
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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);