src/PlatformSupport/XalanBitmap.cpp

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2000 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

#include "XalanBitmap.hpp"



#include <algorithm>



// Pre-constructed masks for bit twiddling.  Update these if not using chars for storing the bits.
static const int	theSetMasks[XalanBitmap::eBitsPerUnit] = { 1, 2, 4, 8, 16, 32, 64, 128 };
static const int	theClearMasks[XalanBitmap::eBitsPerUnit] = { ~1, ~2, ~4, ~8, ~16, ~32, ~64, ~128 };



XalanBitmap::XalanBitmap(size_type	theSize) :
	m_size(theSize),
	m_bitmap(size_type((theSize + eBitsPerUnit) / eBitsPerUnit), BitmapVectorType::value_type(0))
{
}



XalanBitmap::~XalanBitmap()
{
}



bool
XalanBitmap::isSet(size_type	theBit) const
{
	if (theBit >= m_size)
	{
		return false;
	}
	else
	{
		return m_bitmap[theBit / eBitsPerUnit] & theSetMasks[theBit % eBitsPerUnit] ? true : false;
	}
}



void
XalanBitmap::set(size_type	theBit)
{
	if (theBit < m_size)
	{
		m_bitmap[theBit / eBitsPerUnit] |= theSetMasks[theBit % eBitsPerUnit];
	}
}



void
XalanBitmap::clear(size_type	theBit)
{
	if (theBit < m_size)
	{
		m_bitmap[theBit / eBitsPerUnit] &= theClearMasks[theBit % eBitsPerUnit];
	}
}



void
XalanBitmap::toggle(size_type	theBit)
{
	if (theBit < m_size)
	{
		m_bitmap[theBit / eBitsPerUnit] ^= theSetMasks[theBit % eBitsPerUnit];
	}
}



void
XalanBitmap::clearAll()
{
#if !defined(XALAN_NO_NAMESPACES)
	using std::fill;
#endif

	fill(m_bitmap.begin(), m_bitmap.end(), 0);
}