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annotate shterm.js @ 175:4dd87508fc96

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Add server-side support for watching dgamelaunch games.
author John "Elwin" Edwards
date Tue, 13 Jan 2015 20:30:10 -0500
parents c4a32007d2dc
children
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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 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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