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48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
#pragma once
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/* Copyright © 2010 Christoph Sünderhauf
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*
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* This file is part of Xelix.
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*
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* Xelix 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 3 of the License, or
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* (at your option) any later version.
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*
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* Xelix 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 Xelix. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "generic.h"
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typedef struct {
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uint32_t numbits;
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/* an array large enough for numbits to fit in. Might
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* (if numbits%8!=0) have some spare bits at the end
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*/
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uint32_t* bits;
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} bitmap_t;
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// creates a new bitmap.
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// CONTENT IS RANDOM! - use bitmap_clearall() to clear the bitmap.
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bitmap_t bitmap_init(uint32_t numbits);
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// returns 1 or 0
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uint8_t bitmap_get(bitmap_t bitmap, uint32_t bitnum);
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// sets a bit (to 1)
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void bitmap_set(bitmap_t bitmap, uint32_t bitnum);
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// clears a bit (to 0)
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void bitmap_clear(bitmap_t bitmap, uint32_t bitnum);
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// clears every bit to 0
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void bitmap_clearAll(bitmap_t bitmap);
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// finds the first bit set to 0 returns 0 if no cleared bit found (0 is also returned if the first bit is cleared)
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uint32_t bitmap_findFirstClear(bitmap_t bitmap);
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