initial

1 files changed, 96 insertions, 0 deletions

diff --git a/spicedataview.js b/spicedataview.js
new file mode 100644
index 0000000..ef9555d
--- /dev/null
+++ b/spicedataview.js
@@ -0,0 +1,96 @@
+"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);
+    },
+    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);
+    },
+}