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annotate shterm.js @ 168:0ceaca924b4c

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Remove the TermSession 'open' event. Failure is now signaled with a TermSession.failed flag. Playing two games at the same time no longer causes crashes, but it does send the same output to both players.
author John "Elwin" Edwards
date Fri, 09 Jan 2015 08:55:38 -0500
parents c4a32007d2dc
children
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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 conn = null; // WebSocket
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7
0
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8 function writeData(hexstr) {
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9 var codenum;
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10 var codes = [];
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11 var nc;
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12 var u8wait = 0; /* Stores bits from previous bytes of multibyte sequences. */
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13 var expect = 0; /* The number of 10------ bytes expected. */
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14 /* UTF-8 translation. */
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15 for (var i = 0; i < hexstr.length; i += 2) {
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16 nc = Number("0x" + hexstr.substr(i, 2));
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17 if (nc < 0x7F) {
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18 /* 0------- */
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19 codes.push(nc);
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20 /* Any incomplete sequence will be discarded. */
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21 u8wait = 0;
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22 expect = 0;
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23 }
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24 else if (nc < 0xC0) {
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25 /* 10------ : part of a multibyte sequence */
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26 if (expect > 0) {
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27 u8wait <<= 6;
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28 u8wait += (nc & 0x3F);
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29 expect--;
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30 if (expect == 0) {
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31 codes.push(u8wait);
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32 u8wait = 0;
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33 }
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34 }
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35 else {
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36 /* Assume an initial byte was missed. */
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37 u8wait = 0;
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38 }
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39 }
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40 /* These will all discard any incomplete sequence. */
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41 else if (nc < 0xE0) {
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42 /* 110----- : introduces 2-byte sequence */
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43 u8wait = (nc & 0x1F);
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44 expect = 1;
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45 }
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46 else if (nc < 0xF0) {
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47 /* 1110---- : introduces 3-byte sequence */
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48 u8wait = (nc & 0x0F);
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49 expect = 2;
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50 }
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51 else if (nc < 0xF8) {
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52 /* 11110--- : introduces 4-byte sequence */
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53 u8wait = (nc & 0x07);
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54 expect = 3;
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55 }
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56 else if (nc < 0xFC) {
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57 /* 111110-- : introduces 5-byte sequence */
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58 u8wait = (nc & 0x03);
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59 expect = 4;
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60 }
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61 else if (nc < 0xFE) {
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62 /* 1111110- : introduces 6-byte sequence */
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63 u8wait = (nc & 0x01);
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64 expect = 5;
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65 }
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66 else {
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67 /* 1111111- : should never appear */
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68 u8wait = 0;
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69 expect = 0;
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70 }
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71 /* Supporting all 31 bits is probably overkill... */
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72 }
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73 termemu.write(codes);
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74 return;
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75 }
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76
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77 function sendback(str) {
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78 /* For responding to terminal queries. */
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79 if (conn) {
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80 var msgObj = {"t": "d", "d": str};
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81 conn.send(JSON.stringify(msgObj));
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82 }
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83 else {
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84 debug(1, "No connection: cannot send " + str);
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85 }
0
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86 return;
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87 }
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88
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