mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-05 16:46:26 +00:00
228 lines
6.4 KiB
C++
228 lines
6.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
|
|
#ifndef _FAST_BITSET_H_
|
|
#define _FAST_BITSET_H_
|
|
|
|
#include "Fundamentals.h"
|
|
#include "Pool.h"
|
|
|
|
#define FBS_ROUNDED_WORDS(x) (((x) + 31) >> 5)
|
|
|
|
class FastBitSet
|
|
{
|
|
private:
|
|
Pool* pool;
|
|
PRUint32* words;
|
|
PRUint32 nWords;
|
|
PRUint32 nBits;
|
|
bool wordsAreMine;
|
|
|
|
inline void reserve(PRUint32 n);
|
|
inline void copy(PRUint32* src, PRUint32 size);
|
|
|
|
public:
|
|
FastBitSet() : pool(NULL), words(0), nWords(0), nBits(0), wordsAreMine(false) {}
|
|
FastBitSet(Pool& p) : pool(&p), words(0), nWords(0), nBits(0), wordsAreMine(false) {}
|
|
FastBitSet(PRUint32 n) : pool(NULL), words(0), nWords(0), nBits(n), wordsAreMine(false) {sizeToAndClear(n);}
|
|
FastBitSet(Pool& p, PRUint32 n) : pool(&p), words(0), nWords(0), nBits(n), wordsAreMine(false) {sizeToAndClear(n);}
|
|
FastBitSet(PRUint32* ptr, PRUint32 n) : pool(NULL), words(ptr), nWords(FBS_ROUNDED_WORDS(n)), nBits(n), wordsAreMine(false) {}
|
|
FastBitSet(const FastBitSet& x) : pool(x.pool), words(0), nWords(x.nWords), nBits(x.nBits), wordsAreMine(false) {sizeTo(x.nBits); copy(x.words, x.nWords);}
|
|
~FastBitSet() {if (words && wordsAreMine) delete words;}
|
|
|
|
inline PRUint32* getWords() {return words;}
|
|
|
|
inline void copyFrom(const FastBitSet& x) {copy(x.words, x.nWords);}
|
|
inline void operator = (const FastBitSet& x) {sizeTo(x.nBits); copy(x.words, x.nWords);}
|
|
inline FastBitSet& operator |= (const FastBitSet& x);
|
|
inline FastBitSet& operator &= (const FastBitSet& x);
|
|
inline FastBitSet& operator -= (const FastBitSet& x);
|
|
inline friend bool operator == (const FastBitSet& x, const FastBitSet& y);
|
|
inline friend bool operator != (const FastBitSet& x, const FastBitSet& y);
|
|
|
|
inline void sizeTo(PRUint32 n) {PR_ASSERT(n); nBits = n; if (nWords < FBS_ROUNDED_WORDS(n)) reserve(n);}
|
|
inline void sizeTo(Pool& p, PRUint32 n) {PR_ASSERT(n); pool = &p; nBits = n; if (nWords < FBS_ROUNDED_WORDS(n)) reserve(n);}
|
|
inline void sizeToAndClear(PRUint32 n) {PR_ASSERT(n); sizeTo(n); clear();}
|
|
inline void sizeToAndClear(Pool& p, PRUint32 n) {PR_ASSERT(n); sizeTo(p, n); clear();}
|
|
|
|
inline bool empty();
|
|
|
|
inline void clear();
|
|
inline void clear(PRUint32 n);
|
|
void clear(PRUint32 from, PRUint32 to);
|
|
|
|
inline void set();
|
|
inline void set(PRUint32 n);
|
|
void set(PRUint32 from, PRUint32 to);
|
|
|
|
bool setAndTest(const FastBitSet& x);
|
|
|
|
inline bool test(PRUint32 n) const;
|
|
|
|
inline PRInt32 firstOne() const {return nextOne(-1);}
|
|
PRInt32 nextOne(PRInt32 pos) const;
|
|
inline PRInt32 lastOne() const {return previousOne(nBits);}
|
|
PRInt32 previousOne(PRInt32 pos) const;
|
|
|
|
inline PRInt32 firstZero() const {return nextZero(-1);}
|
|
PRInt32 nextZero(PRInt32 pos) const;
|
|
|
|
PRUint32 countOnes();
|
|
PRUint32 countOnes(PRUint32 from, PRUint32 to);
|
|
inline PRUint32 countZeros() {return nBits - countOnes();}
|
|
|
|
#ifdef DEBUG_LOG
|
|
void printPretty(FILE *f);
|
|
void printDiff(FILE *f, const FastBitSet& x);
|
|
void printPrettyOnes(FILE *f);
|
|
void printPrettyZeros(FILE *f);
|
|
#endif
|
|
};
|
|
|
|
inline bool
|
|
operator == (const FastBitSet& x, const FastBitSet& y)
|
|
{
|
|
register PRUint32* xWords = x.words;
|
|
register PRUint32* yWords = y.words;
|
|
register int size = x.nWords-1;
|
|
|
|
do if (xWords[size] != yWords[size]) return false; while (--size >= 0);
|
|
return true;
|
|
}
|
|
|
|
inline bool
|
|
operator != (const FastBitSet& x, const FastBitSet& y)
|
|
{
|
|
return !(x==y);
|
|
}
|
|
|
|
inline FastBitSet& FastBitSet::operator |= (const FastBitSet& x)
|
|
{
|
|
register PRUint32* xWords = words;
|
|
register PRUint32* yWords = x.words;
|
|
register int size = nWords - 1;
|
|
do xWords[size] |= yWords[size]; while (--size >= 0);
|
|
return *this;
|
|
}
|
|
|
|
inline FastBitSet& FastBitSet::operator &= (const FastBitSet& x)
|
|
{
|
|
register PRUint32* xWords = words;
|
|
register PRUint32* yWords = x.words;
|
|
register int size = nWords - 1;
|
|
do xWords[size] &= yWords[size]; while (--size >= 0);
|
|
return *this;
|
|
}
|
|
|
|
inline FastBitSet& FastBitSet::operator -= (const FastBitSet& x)
|
|
{
|
|
register PRUint32* xWords = words;
|
|
register PRUint32* yWords = x.words;
|
|
register int size = nWords - 1;
|
|
do xWords[size] &= ~yWords[size]; while (--size >= 0);
|
|
return *this;
|
|
}
|
|
|
|
inline bool FastBitSet::test(PRUint32 n) const
|
|
{
|
|
register PRUint8 shift = n & 31;
|
|
register PRUint32 mask = (1 << shift);
|
|
if ((words[n >> 5] & mask) > 0)
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
inline void FastBitSet::set(PRUint32 n)
|
|
{
|
|
register PRUint8 shift = n & 31;
|
|
register PRUint32 mask = (1 << shift);
|
|
words[n >> 5] |= mask;
|
|
}
|
|
|
|
inline void FastBitSet::clear(PRUint32 n)
|
|
{
|
|
register PRUint8 shift = n & 31;
|
|
register PRUint32 mask = (1 << shift);
|
|
mask = ~mask;
|
|
words[n >> 5] &= mask;
|
|
}
|
|
|
|
inline bool FastBitSet::empty()
|
|
{
|
|
register PRUint32* ptr = words;
|
|
register int size = nWords-1;
|
|
do
|
|
if (ptr[size] != 0)
|
|
return false;
|
|
while (--size >= 0);
|
|
|
|
return true;
|
|
}
|
|
|
|
inline void FastBitSet::set()
|
|
{
|
|
register PRUint32* ptr = words;
|
|
register PRUint32 val = ~0;
|
|
register int size = nWords-1;
|
|
do ptr[size] = val; while (--size >= 0);
|
|
}
|
|
|
|
inline void FastBitSet::clear()
|
|
{
|
|
register PRUint32* ptr = words;
|
|
register PRUint32 val = 0;
|
|
register int size = nWords-1;
|
|
do ptr[size] = val; while (--size >= 0);
|
|
}
|
|
|
|
inline void FastBitSet::reserve(PRUint32 n)
|
|
{
|
|
if (words && wordsAreMine) delete words;
|
|
nWords = FBS_ROUNDED_WORDS(n);
|
|
if (pool != NULL)
|
|
{
|
|
words = new(*pool) PRUint32[nWords];
|
|
wordsAreMine = false;
|
|
}
|
|
else
|
|
{
|
|
words = new PRUint32[nWords];
|
|
wordsAreMine = true;
|
|
}
|
|
}
|
|
|
|
inline void FastBitSet::
|
|
copy(PRUint32* src, PRUint32 size)
|
|
{
|
|
PR_ASSERT(size <= nWords);
|
|
register PRUint32* ptr = words;
|
|
register int len = size-1;
|
|
src = &src[len];
|
|
do ptr[len] = *src--; while (--len >= 0);
|
|
if (size < nWords)
|
|
do ptr[size] = 0; while (++size < nWords);
|
|
}
|
|
|
|
|
|
#endif /* _FAST_BITSET_H_ */
|