/***************************************************************************

 *                         Arrays of Arbitrary Bit Length

 *

 *   File    : bitarray.h

 *   Purpose : Header file for class supporting the creation and

 *             manipulation of arbitrary length arrays of bits.

 *   Author  : Michael Dipperstein

 *   Date    : July 23, 2004

 *

 ****************************************************************************

 *   HISTORY

 *

 *   $Id: bitarray.h,v 1.5 2010/02/04 03:31:43 michael Exp $

 *   $Log: bitarray.h,v $

 *   Revision 1.5  2010/02/04 03:31:43  michael

 *   Replaced vector<unsigned char> with an array of unsigned char.

 *

 *   Made updates for GCC 4.4.

 *

 *   Revision 1.4  2007/08/06 05:23:12  michael

 *   Updated for LGPL Version 3.

 *

 *   All methods that don't modify object have been made

 *   const to increase functionality of const bit_array_c.

 *

 *   All assignment operators return a reference to the object being assigned a value so that operator chaining will work.

 *

 *   Added >> and << operators.

 *

 *   Revision 1.3  2006/04/30 23:34:07  michael

 *   Improved performance by incorporating Benjamin Schindler's

 *   <bschindler@student.ethz.ch> changes to pass arguments as a reference.

 *

 *   Revision 1.2  2004/08/05 22:17:04  michael

 *   Add overloads for bitwise operators returning values.

 *   Add a more natural looking way to set bit values.

 *

 *   Revision 1.1.1.1  2004/08/04 13:28:20  michael

 *   bit_array_c

 *

 ****************************************************************************

 *

 * Bitarray: An ANSI C++ class for manipulating arbitrary length bit arrays

 * Copyright (C) 2004, 2006-2007, 2010 by

 *       Michael Dipperstein (mdipper@alumni.engr.ucsb.edu)

 *

 * This file is part of the bit array library.

 *

 * The bit array library 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.

 *

 * The bit array library 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 this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 ***************************************************************************/

 #ifndef BIT_ARRAY_H

 #define BIT_ARRAY_H

 /***************************************************************************

 *                             INCLUDED FILES

 ***************************************************************************/

 #include <ostream>

 /***************************************************************************

 *                            TYPE DEFINITIONS

 ***************************************************************************/

 class BitArray;

 /**

 */

 class BitArrayIndex

 {

     public:

         BitArrayIndex(BitArray *array, const unsigned int index);

         /* assignment */

         void operator=(const bool src);

     private:

         BitArray *m_BitArray;        /* array index applies to */

         unsigned int m_Index;           /* index of bit in array */

 };

 /**

 TODO: Derive a Bit Frame class from this one for X Y access to pixels.

 */

 class BitArray

 {

     public:

         BitArray(const int numBits);

         BitArray(unsigned char *array, const int numBits, bool aOwnsBuffer);

         virtual ~BitArray(void);

         void Dump(std::ostream &outStream);

         const unsigned int SizeInBits() { return m_NumBits; }

         const unsigned int SizeInBytes() { return m_SizeInBytes; }

         /* set/clear functions */

         void SetAll(void);

         void ClearAll(void);

         void SetBit(const unsigned int bit);

 		void SetBitValue(const unsigned int bit, bool aValue);

         void ClearBit(const unsigned int bit);

         BitArrayIndex operator()(const unsigned int bit);

         /* boolean operator */

         bool operator[](const unsigned int bit) const;

         bool operator==(const BitArray &other) const;

         bool operator!=(const BitArray &other) const;

         bool operator<(const BitArray &other) const;

         bool operator<=(const BitArray &other) const;

         bool operator>(const BitArray &other) const;

         bool operator>=(const BitArray &other) const;

         /* bitwise operators */

         BitArray operator&(const BitArray &other) const;

         BitArray operator^(const BitArray &other) const;

         BitArray operator|(const BitArray &other) const;

         BitArray operator~(void) const;

         BitArray operator<<(const unsigned int count) const;

         BitArray operator>>(const unsigned int count) const;

         /* increment/decrement */

         BitArray& operator++(void);          /* prefix */

         BitArray& operator++(int dummy);     /* postfix */

         BitArray& operator--(void);          /* prefix */

         BitArray& operator--(int dummy);     /* postfix */

         /* assignments */

         BitArray& operator=(const BitArray &src);

         BitArray& operator&=(const BitArray &src);

         BitArray& operator^=(const BitArray &src);

         BitArray& operator|=(const BitArray &src);

         BitArray& Not(void);                 /* negate (~=) */

         BitArray& operator<<=(unsigned const int shifts);

         BitArray& operator>>=(unsigned const int shifts);

 		unsigned char* Ptr(){return m_Array;}

 		const unsigned char* Ptr() const{return m_Array;}

     protected:

         unsigned int m_NumBits;                 /* number of bits in the array */

 		unsigned int m_SizeInBytes;

         unsigned char *m_Array;                 /* vector of characters */

         bool m_OwnsBuffer;

 };

 #endif  /* ndef BIT_ARRAY_H */