ecmfwebw.js

/*
    This file is part of Alpertron Calculators.

    Copyright 2015 Dario Alejandro Alpern

    Alpertron Calculators is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Alpertron Calculators is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Alpertron Calculators.  If not, see <http://www.gnu.org/licenses/>.
*/
  var exports, HEAPU8, wasmLoaded;
  var env =
  {
    "databack": function(data)
    {
      self.postMessage(PtrToString(data));
    },
    "tenths": function()
    {
      return Math.floor(new Date().getTime() / 100);
    },
    "getCunn": function(data)
    {
      var req = new XMLHttpRequest();
      // Web worker protocol is blob:, so we need to change that to https: as appropriate.
      req.open('GET', "https://www.alpertron.com.ar/"+PtrToString(data), false);
      req.send(null);
      if (req.status == 200)
      {
        ConvertToString(exports["getFactorsAsciiPtr"](), req.responseText);
      }
    }
  };

  var info =
  {
    "env": env
  };  

  self.onmessage = function (e)
  {
    var request;
    if (wasmLoaded)
    {
      ConvertToString(exports["getInputStringPtr"](), e.data[0]);
      exports["doWork"]();
      return;  
    }
    WebAssembly["instantiate"](e.data[1], info).then(function(results)
    {
      wasmLoaded = 1;
      exports = results["instance"]["exports"];
      HEAPU8 = new Uint8Array(exports["memory"]["buffer"]);
      ConvertToString(exports["getInputStringPtr"](), e.data[0]);
      exports["doWork"]();
      return;
    });
  }

  function PtrToString(ptr)
  {
    var t=-1;
    var i = 0;
    var str="", outString="";
    do
    {
      for (i=0; i<1024; i++)
      {
        t = HEAPU8[((ptr++)>>0)];
        if (t==0)
        {
          break;
        }
        if (t>=128)
        {
          t = ((t-192)<<6) + HEAPU8[((ptr++)>>0)] - 128;
        }
        str += String.fromCharCode(t);
      }
      outString += str;
      str = "";
    } while (t!=0);
    outString += str;
    return outString;
  }

  function ConvertToString(ptr, str)
  {
    var dest = ptr;
    var length = str.length;
    var i, t;
    for (i=0; i<length; i++)
    {
      t = str.charCodeAt(i);
      if (t<128)
      {
        HEAPU8[dest++] = t;
      }
      else
      {
        HEAPU8[dest++] = (t >> 6) + 192;
        HEAPU8[dest++] = (t & 63) + 128;
      }
    }
    HEAPU8[dest] = 0;
  }