Read Compressed UInt32
/*
This file is part of Sunlit World Scheme
http://swscheme.codeplex.com/
Copyright (c) 2010 by Edward Kiser (edkiser@gmail.com)
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace ExprObjModel
{
public static partial class Utils
{
public static uint ReadCompressedUInt32(this Stream str)
{
uint result = 0u;
int shift = 0;
while (true)
{
int x = str.ReadByte();
if (x == -1) throw new EndOfStreamException("Expected byte of a compressed UInt32");
result |= unchecked((uint)(x & 0x7F)) << shift;
if ((x & 0x80) == 0) break;
shift += 7;
}
return result;
}
}
}
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