mirror of https://github.com/PCSX2/pcsx2.git
41 lines
1.6 KiB
C
41 lines
1.6 KiB
C
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/*
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* bitmaskros.h
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*
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* Helper macros for large bit masks management
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*
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* Copyright (C) 2008 Jean-Philippe Meuret
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Number of bits for 1 unsigned char */
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#define nBitsPerUchar (sizeof(unsigned char) * 8)
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/* Number of unsigned chars to contain a given number of bits */
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#define nUcharsForNBits(nBits) ((((nBits)-1)/nBitsPerUchar)+1)
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/* Index=Offset of given bit in 1 unsigned char */
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#define bitOffsetInUchar(bit) ((bit)%nBitsPerUchar)
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/* Index=Offset of the unsigned char associated to the bit
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at the given index=offset */
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#define ucharIndexForBit(bit) ((bit)/nBitsPerUchar)
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/* Value of an unsigned char with bit set at given index=offset */
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#define ucharValueForBit(bit) (((unsigned char)(1))<<bitOffsetInUchar(bit))
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/* Test the bit with given index=offset in an unsigned char array */
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#define testBit(bit, array) ((array[ucharIndexForBit(bit)] >> bitOffsetInUchar(bit)) & 1)
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