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// -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
// vim:tabstop=4:shiftwidth=4:expandtab:
/*
* Copyright (C) 2004-2008 Wu Yongwei <adah at users dot sourceforge dot net>
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any
* damages arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute
* it freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must
* not claim that you wrote the original software. If you use this
* software in a product, an acknowledgement in the product
* documentation would be appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must
* not be misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source
* distribution.
*
* This file is part of Stones of Nvwa:
* http://sourceforge.net/projects/nvwa
*
*/
/**
* @file bool_array.cpp
*
* Code for class bool_array (packed boolean array).
*
* @version 3.1, 2005/08/25
* @author Wu Yongwei
*
*/
#include <limits.h>
#include <string.h>
#include "bool_array.h"
BYTE bool_array::_S_bit_count[256] =
{
0, /* 0 */ 1, /* 1 */ 1, /* 2 */ 2, /* 3 */ 1, /* 4 */
2, /* 5 */ 2, /* 6 */ 3, /* 7 */ 1, /* 8 */ 2, /* 9 */
2, /* 10 */ 3, /* 11 */ 2, /* 12 */ 3, /* 13 */ 3, /* 14 */
4, /* 15 */ 1, /* 16 */ 2, /* 17 */ 2, /* 18 */ 3, /* 19 */
2, /* 20 */ 3, /* 21 */ 3, /* 22 */ 4, /* 23 */ 2, /* 24 */
3, /* 25 */ 3, /* 26 */ 4, /* 27 */ 3, /* 28 */ 4, /* 29 */
4, /* 30 */ 5, /* 31 */ 1, /* 32 */ 2, /* 33 */ 2, /* 34 */
3, /* 35 */ 2, /* 36 */ 3, /* 37 */ 3, /* 38 */ 4, /* 39 */
2, /* 40 */ 3, /* 41 */ 3, /* 42 */ 4, /* 43 */ 3, /* 44 */
4, /* 45 */ 4, /* 46 */ 5, /* 47 */ 2, /* 48 */ 3, /* 49 */
3, /* 50 */ 4, /* 51 */ 3, /* 52 */ 4, /* 53 */ 4, /* 54 */
5, /* 55 */ 3, /* 56 */ 4, /* 57 */ 4, /* 58 */ 5, /* 59 */
4, /* 60 */ 5, /* 61 */ 5, /* 62 */ 6, /* 63 */ 1, /* 64 */
2, /* 65 */ 2, /* 66 */ 3, /* 67 */ 2, /* 68 */ 3, /* 69 */
3, /* 70 */ 4, /* 71 */ 2, /* 72 */ 3, /* 73 */ 3, /* 74 */
4, /* 75 */ 3, /* 76 */ 4, /* 77 */ 4, /* 78 */ 5, /* 79 */
2, /* 80 */ 3, /* 81 */ 3, /* 82 */ 4, /* 83 */ 3, /* 84 */
4, /* 85 */ 4, /* 86 */ 5, /* 87 */ 3, /* 88 */ 4, /* 89 */
4, /* 90 */ 5, /* 91 */ 4, /* 92 */ 5, /* 93 */ 5, /* 94 */
6, /* 95 */ 2, /* 96 */ 3, /* 97 */ 3, /* 98 */ 4, /* 99 */
3, /* 100 */ 4, /* 101 */ 4, /* 102 */ 5, /* 103 */ 3, /* 104 */
4, /* 105 */ 4, /* 106 */ 5, /* 107 */ 4, /* 108 */ 5, /* 109 */
5, /* 110 */ 6, /* 111 */ 3, /* 112 */ 4, /* 113 */ 4, /* 114 */
5, /* 115 */ 4, /* 116 */ 5, /* 117 */ 5, /* 118 */ 6, /* 119 */
4, /* 120 */ 5, /* 121 */ 5, /* 122 */ 6, /* 123 */ 5, /* 124 */
6, /* 125 */ 6, /* 126 */ 7, /* 127 */ 1, /* 128 */ 2, /* 129 */
2, /* 130 */ 3, /* 131 */ 2, /* 132 */ 3, /* 133 */ 3, /* 134 */
4, /* 135 */ 2, /* 136 */ 3, /* 137 */ 3, /* 138 */ 4, /* 139 */
3, /* 140 */ 4, /* 141 */ 4, /* 142 */ 5, /* 143 */ 2, /* 144 */
3, /* 145 */ 3, /* 146 */ 4, /* 147 */ 3, /* 148 */ 4, /* 149 */
4, /* 150 */ 5, /* 151 */ 3, /* 152 */ 4, /* 153 */ 4, /* 154 */
5, /* 155 */ 4, /* 156 */ 5, /* 157 */ 5, /* 158 */ 6, /* 159 */
2, /* 160 */ 3, /* 161 */ 3, /* 162 */ 4, /* 163 */ 3, /* 164 */
4, /* 165 */ 4, /* 166 */ 5, /* 167 */ 3, /* 168 */ 4, /* 169 */
4, /* 170 */ 5, /* 171 */ 4, /* 172 */ 5, /* 173 */ 5, /* 174 */
6, /* 175 */ 3, /* 176 */ 4, /* 177 */ 4, /* 178 */ 5, /* 179 */
4, /* 180 */ 5, /* 181 */ 5, /* 182 */ 6, /* 183 */ 4, /* 184 */
5, /* 185 */ 5, /* 186 */ 6, /* 187 */ 5, /* 188 */ 6, /* 189 */
6, /* 190 */ 7, /* 191 */ 2, /* 192 */ 3, /* 193 */ 3, /* 194 */
4, /* 195 */ 3, /* 196 */ 4, /* 197 */ 4, /* 198 */ 5, /* 199 */
3, /* 200 */ 4, /* 201 */ 4, /* 202 */ 5, /* 203 */ 4, /* 204 */
5, /* 205 */ 5, /* 206 */ 6, /* 207 */ 3, /* 208 */ 4, /* 209 */
4, /* 210 */ 5, /* 211 */ 4, /* 212 */ 5, /* 213 */ 5, /* 214 */
6, /* 215 */ 4, /* 216 */ 5, /* 217 */ 5, /* 218 */ 6, /* 219 */
5, /* 220 */ 6, /* 221 */ 6, /* 222 */ 7, /* 223 */ 3, /* 224 */
4, /* 225 */ 4, /* 226 */ 5, /* 227 */ 4, /* 228 */ 5, /* 229 */
5, /* 230 */ 6, /* 231 */ 4, /* 232 */ 5, /* 233 */ 5, /* 234 */
6, /* 235 */ 5, /* 236 */ 6, /* 237 */ 6, /* 238 */ 7, /* 239 */
4, /* 240 */ 5, /* 241 */ 5, /* 242 */ 6, /* 243 */ 5, /* 244 */
6, /* 245 */ 6, /* 246 */ 7, /* 247 */ 5, /* 248 */ 6, /* 249 */
6, /* 250 */ 7, /* 251 */ 6, /* 252 */ 7, /* 253 */ 7, /* 254 */
8 /* 255 */
}; // End _S_bit_count
/**
* Creates the packed boolean array with a specific size.
*
* @param __size size of the array
* @return \c false if \a __size equals \c 0 or is too big, or
* if memory is insufficient; \c true if \a __size has
* a suitable value and memory allocation is
* successful.
*/
bool bool_array::create(unsigned long __size)
{
if (__size == 0)
return false;
// Will be optimized away by a decent compiler if ULONG_MAX == UINT_MAX
if (ULONG_MAX > UINT_MAX && ((__size - 1) / 8 + 1) > UINT_MAX)
return false;
size_t __byte_cnt = (size_t)((__size - 1) / 8 + 1);
if (_M_byte_ptr)
free(_M_byte_ptr);
_M_length = 0;
// Uses malloc/free instead of new/delete to avoid exception handling
// differences between compilers
if (!(_M_byte_ptr = (BYTE*)malloc(__byte_cnt)))
return false;
_M_length = __size;
return true;
}
/**
* Initializes all array elements to a specific value optimally.
*
* @param value the boolean value to assign to all elements
*/
void bool_array::initialize(bool value)
{
assert(_M_byte_ptr);
size_t __byte_cnt = (size_t)((_M_length - 1) / 8) + 1;
memset(_M_byte_ptr, value ? ~0 : 0, __byte_cnt);
if (value)
{
int __valid_bits_in_last_byte = (_M_length - 1) % 8 + 1;
_M_byte_ptr[__byte_cnt - 1] &= ~(~0 << __valid_bits_in_last_byte);
}
}
/**
* Counts elements with a \c true value.
*
* @return the count of \c true elements
*/
unsigned long bool_array::count() const
{
assert(_M_byte_ptr);
unsigned long __true_cnt = 0;
size_t __byte_cnt = (size_t)((_M_length - 1) / 8) + 1;
for (size_t __i = 0; __i < __byte_cnt; ++__i)
__true_cnt += _S_bit_count[_M_byte_ptr[__i]];
return __true_cnt;
}
/**
* Counts elements with a \c true value in a specified range.
*
* @param __beg beginning of the range
* @param __end end of the range (exclusive)
* @return the count of \c true elements
*/
unsigned long bool_array::count(unsigned long __beg, unsigned long __end) const
{
assert(_M_byte_ptr);
unsigned long __true_cnt = 0;
size_t __byte_idx_beg, __byte_idx_end;
BYTE __byte_val;
if (__beg >= __end)
return 0;
if (__end > _M_length)
throw std::out_of_range("invalid bool_array subscript");
--__end;
__byte_idx_beg = (size_t)(__beg / 8);
__byte_val = _M_byte_ptr[__byte_idx_beg];
__byte_val &= ~0 << (__beg % 8);
__byte_idx_end = (size_t)(__end / 8);
if (__byte_idx_beg < __byte_idx_end)
{
__true_cnt = _S_bit_count[__byte_val];
__byte_val = _M_byte_ptr[__byte_idx_end];
}
__byte_val &= ~(~0 << (__end % 8 + 1));
__true_cnt += _S_bit_count[__byte_val];
for (++__byte_idx_beg; __byte_idx_beg < __byte_idx_end; ++__byte_idx_beg)
__true_cnt += _S_bit_count[_M_byte_ptr[__byte_idx_beg]];
return __true_cnt;
}
/**
* Changes all \c true elements to \c false, and \c false ones to \c true.
*/
void bool_array::flip()
{
assert(_M_byte_ptr);
size_t __byte_cnt = (size_t)((_M_length - 1) / 8) + 1;
for (size_t __i = 0; __i < __byte_cnt; ++__i)
_M_byte_ptr[__i] = ~_M_byte_ptr[__i];
int __valid_bits_in_last_byte = (_M_length - 1) % 8 + 1;
_M_byte_ptr[__byte_cnt - 1] &= ~(~0 << __valid_bits_in_last_byte);
}
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