121 lines
3.5 KiB
JavaScript
121 lines
3.5 KiB
JavaScript
"use strict";
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/*
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Copyright (C) 2012 by Jeremy P. White <jwhite@codeweavers.com>
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This file is part of spice-html5.
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spice-html5 is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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spice-html5 is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with spice-html5. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*----------------------------------------------------------------------------
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** SpiceDataView
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** FIXME FIXME
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** This is used because Firefox does not have DataView yet.
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** We should use DataView if we have it, because it *has* to
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** be faster than this code
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**--------------------------------------------------------------------------*/
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function SpiceDataView(buffer, byteOffset, byteLength)
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{
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if (byteOffset !== undefined)
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{
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if (byteLength !== undefined)
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this.u8 = new Uint8Array(buffer, byteOffset, byteLength);
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else
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this.u8 = new Uint8Array(buffer, byteOffset);
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}
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else
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this.u8 = new Uint8Array(buffer);
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};
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SpiceDataView.prototype = {
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getUint8: function(byteOffset)
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{
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return this.u8[byteOffset];
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},
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getUint16: function(byteOffset, littleEndian)
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{
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var low = 1, high = 0;
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if (littleEndian)
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{
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low = 0;
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high = 1;
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}
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return (this.u8[byteOffset + high] << 8) | this.u8[byteOffset + low];
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},
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getUint32: function(byteOffset, littleEndian)
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{
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var low = 2, high = 0;
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if (littleEndian)
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{
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low = 0;
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high = 2;
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}
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return (this.getUint16(byteOffset + high, littleEndian) << 16) |
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this.getUint16(byteOffset + low, littleEndian);
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},
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getUint64: function (byteOffset, littleEndian)
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{
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var low = 4, high = 0;
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if (littleEndian)
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{
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low = 0;
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high = 4;
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}
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return (this.getUint32(byteOffset + high, littleEndian) << 32) |
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this.getUint32(byteOffset + low, littleEndian);
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},
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setUint8: function(byteOffset, b)
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{
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this.u8[byteOffset] = (b & 0xff);
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},
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setUint16: function(byteOffset, i, littleEndian)
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{
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var low = 1, high = 0;
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if (littleEndian)
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{
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low = 0;
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high = 1;
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}
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this.u8[byteOffset + high] = (i & 0xffff) >> 8;
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this.u8[byteOffset + low] = (i & 0x00ff);
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},
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setUint32: function(byteOffset, w, littleEndian)
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{
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var low = 2, high = 0;
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if (littleEndian)
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{
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low = 0;
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high = 2;
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}
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this.setUint16(byteOffset + high, (w & 0xffffffff) >> 16, littleEndian);
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this.setUint16(byteOffset + low, (w & 0x0000ffff), littleEndian);
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},
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setUint64: function(byteOffset, w, littleEndian)
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{
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var low = 4, high = 0;
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if (littleEndian)
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{
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low = 0;
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high = 4;
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}
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this.setUint32(byteOffset + high, (w & 0xffffffffffffffff) >> 32, littleEndian);
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this.setUint32(byteOffset + low, (w & 0x00000000ffffffff), littleEndian);
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},
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}
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