/* ----> DO NOT REMOVE THE FOLLOWING NOTICE <---- | |
Copyright (c) 2014-2015 Datalight, Inc. | |
All Rights Reserved Worldwide. | |
This program is free software; you can redistribute it and/or modify | |
it under the terms of the GNU General Public License as published by | |
the Free Software Foundation; use version 2 of the License. | |
This program is distributed in the hope that it will be useful, | |
but "AS-IS," WITHOUT ANY WARRANTY; without even the implied warranty | |
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
GNU General Public License for more details. | |
You should have received a copy of the GNU General Public License along | |
with this program; if not, write to the Free Software Foundation, Inc., | |
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
*/ | |
/* Businesses and individuals that for commercial or other reasons cannot | |
comply with the terms of the GPLv2 license may obtain a commercial license | |
before incorporating Reliance Edge into proprietary software for | |
distribution in any form. Visit http://www.datalight.com/reliance-edge for | |
more information. | |
*/ | |
/** @file | |
@brief Implements utilities for working with bitmaps. | |
*/ | |
#include <redfs.h> | |
/** @brief Query the state of a bit in a bitmap. | |
Bits are counted from most significant to least significant. Thus, the mask | |
for bit zero is 0x80 applied to the first byte in the bitmap. | |
@param pbBitmap Pointer to the bitmap. | |
@param ulBit The bit to query. | |
@retval Whether the bit is set (true) or clear (false. | |
*/ | |
bool RedBitGet( | |
const uint8_t *pbBitmap, | |
uint32_t ulBit) | |
{ | |
bool fRet; | |
if(pbBitmap == NULL) | |
{ | |
REDERROR(); | |
fRet = false; | |
} | |
else | |
{ | |
fRet = (pbBitmap[ulBit >> 3U] & (0x80U >> (ulBit & 7U))) != 0U; | |
} | |
return fRet; | |
} | |
/** @brief Set a bit in a bitmap to one. | |
Bits are counted from most significant to least significant. Thus, the mask | |
for bit zero is 0x80 applied to the first byte in the bitmap. | |
@param pbBitmap Pointer to the bitmap. | |
@param ulBit The bit to set. | |
*/ | |
void RedBitSet( | |
uint8_t *pbBitmap, | |
uint32_t ulBit) | |
{ | |
REDASSERT(pbBitmap != NULL); | |
if(pbBitmap != NULL) | |
{ | |
pbBitmap[ulBit >> 3U] |= (0x80U >> (ulBit & 7U)); | |
} | |
} | |
/** @brief Clear a bit in a bitmap to zero. | |
Bits are counted from most significant to least significant. Thus, the mask | |
for bit zero is 0x80 applied to the first byte in the bitmap. | |
@param pbBitmap Pointer to the bitmap. | |
@param ulBit The bit to clear. | |
*/ | |
void RedBitClear( | |
uint8_t *pbBitmap, | |
uint32_t ulBit) | |
{ | |
REDASSERT(pbBitmap != NULL); | |
if(pbBitmap != NULL) | |
{ | |
pbBitmap[ulBit >> 3U] &= ~(0x80U >> (ulBit & 7U)); | |
} | |
} | |