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/**********************************************************************
* $Id$
*
* Name: cpl_mask.h
* Project: CPL - Common Portability Library
* Purpose: Bitmask manipulation functions
* Author: Daniel Baston, dbaston@gmail.com
*
**********************************************************************
* Copyright (c) 2022, ISciences LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifndef CPL_MASK_H_INCLUDED
#define CPL_MASK_H_INCLUDED
#include "cpl_port.h"
#include "cpl_vsi.h"
#ifdef __cplusplus
#include <cstring>
/**
* Allocates a buffer to store a given number of bits
*
* @param size number of bits
* @param default_value initial value of bits
*/
inline GUInt32 *CPLMaskCreate(std::size_t size, bool default_value)
{
std::size_t nBytes = (size + 31) / 8;
void *buf = VSI_MALLOC_VERBOSE(nBytes);
if (buf == nullptr)
{
return nullptr;
}
std::memset(buf, default_value ? 0xff : 0, nBytes);
return static_cast<GUInt32 *>(buf);
}
/**
* Get the value of a bit
*
* @param mask bit mask
* @param i index of bit
* @return `true` if bit is set
*/
inline bool CPLMaskGet(GUInt32 *mask, std::size_t i)
{
return mask[i >> 5] & (0x01 << (i & 0x1f));
}
/**
* Clear the value of a bit (set to false)
*
* @param mask bit mask
* @param i index of bit to clear
*/
inline void CPLMaskClear(GUInt32 *mask, std::size_t i)
{
mask[i >> 5] &= ~(0x01 << (i & 0x1f));
}
/**
* Clear all bits in a mask
*
* @param mask bit mask
* @param size number of bits in mask
*/
inline void CPLMaskClearAll(GUInt32 *mask, std::size_t size)
{
auto nBytes = (size + 31) / 8;
std::memset(mask, 0, nBytes);
}
/**
* Set the value of a bit to true
*
* @param mask bit mask
* @param i index of bit to set
*/
inline void CPLMaskSet(GUInt32 *mask, std::size_t i)
{
mask[i >> 5] |= (0x01 << (i & 0x1f));
}
/**
* Set all bits in a mask
*
* @param mask bit mask
* @param size number of bits in mask
*/
inline void CPLMaskSetAll(GUInt32 *mask, std::size_t size)
{
auto nBytes = (size + 31) / 8;
std::memset(mask, 0xff, nBytes);
}
/**
* Set a mask to true wherever a second mask is true
*
* @param mask1 destination mask
* @param mask2 source mask
* @param n number of bits in masks (must be same)
*/
inline void CPLMaskMerge(GUInt32 *mask1, GUInt32 *mask2, std::size_t n)
{
std::size_t nBytes = (n + 31) / 8;
std::size_t nIter = nBytes / 4;
for (std::size_t i = 0; i < nIter; i++)
{
mask1[i] |= mask2[i];
}
}
#endif // __cplusplus
#endif // CPL_MASK_H
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