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annotate shterm.js @ 13:bf7c26d0b66d

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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>
date Sun, 13 May 2012 20:50:13 -0700
parents 9e1d83f50c9e
children 155f3c104759
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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
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) {