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static/plugins/spice-html5/spicedataview.js 3.51 KB
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831eac332   zhuzhenchao   add file 
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  "use strict";
  /*
     Copyright (C) 2012 by Jeremy P. White <jwhite@codeweavers.com>
  
     This file is part of spice-html5.
  
     spice-html5 is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     spice-html5 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 Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public License
     along with spice-html5.  If not, see <http://www.gnu.org/licenses/>.
  */
  
  /*----------------------------------------------------------------------------
  **  SpiceDataView
  ** FIXME FIXME 
  **    This is used because Firefox does not have DataView yet.
  **    We should use DataView if we have it, because it *has* to 
  **    be faster than this code 
  **--------------------------------------------------------------------------*/
  function SpiceDataView(buffer, byteOffset, byteLength)
  {
      if (byteOffset !== undefined)
      {
          if (byteLength !== undefined)
              this.u8 = new Uint8Array(buffer, byteOffset, byteLength);
          else
              this.u8 = new Uint8Array(buffer, byteOffset);
      }
      else
          this.u8 = new Uint8Array(buffer);
  };
  
  SpiceDataView.prototype = {
      getUint8:  function(byteOffset)
      {
          return this.u8[byteOffset];
      },
      getUint16:  function(byteOffset, littleEndian)
      {
          var low = 1, high = 0;
          if (littleEndian)
          {
              low = 0;
              high = 1;
          }
  
          return (this.u8[byteOffset + high] << 8) | this.u8[byteOffset + low];
      },
      getUint32:  function(byteOffset, littleEndian)
      {
          var low = 2, high = 0;
          if (littleEndian)
          {
              low = 0;
              high = 2;
          }
  
          return (this.getUint16(byteOffset + high, littleEndian) << 16) | 
                  this.getUint16(byteOffset + low, littleEndian);
      },
      getUint64: function (byteOffset, littleEndian)
      {
          var low = 4, high = 0;
          if (littleEndian)
          {
              low = 0;
              high = 4;
          }
  
          return (this.getUint32(byteOffset + high, littleEndian) << 32) |
                  this.getUint32(byteOffset + low, littleEndian);
      },
      setUint8:  function(byteOffset, b)
      {
          this.u8[byteOffset] = (b & 0xff);
      },
      setUint16:  function(byteOffset, i, littleEndian)
      {
          var low = 1, high = 0;
          if (littleEndian)
          {
              low = 0;
              high = 1;
          }
          this.u8[byteOffset + high] = (i & 0xffff) >> 8;
          this.u8[byteOffset + low]  = (i & 0x00ff);
      },
      setUint32:  function(byteOffset, w, littleEndian)
      {
          var low = 2, high = 0;
          if (littleEndian)
          {
              low = 0;
              high = 2;
          }
  
          this.setUint16(byteOffset + high, (w & 0xffffffff) >> 16, littleEndian);
          this.setUint16(byteOffset + low,  (w & 0x0000ffff), littleEndian);
      },
      setUint64:  function(byteOffset, w, littleEndian)
      {
          var low = 4, high = 0;
          if (littleEndian)
          {
              low = 0;
              high = 4;
          }
  
          this.setUint32(byteOffset + high, (w & 0xffffffffffffffff) >> 32, littleEndian);
          this.setUint32(byteOffset + low,  (w & 0x00000000ffffffff), littleEndian);
      },
  }