91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
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/*
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* Copyright (c) 2019 Andri Yngvason
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#pragma once
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stdbool.h>
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#define UDIV_UP(a, b) (((a) + (b) - 1) / (b))
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struct bitmap {
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size_t n_elem;
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uint64_t data[0];
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};
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static inline struct bitmap *bitmap_alloc(size_t bitlen)
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{
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size_t n_elem = UDIV_UP(bitlen, 64);
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struct bitmap *self = calloc(1, sizeof(*self) + n_elem * sizeof(*self->data));
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if (!self)
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return NULL;
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self->n_elem = n_elem;
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return self;
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}
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static inline void bitmap_clear_all(struct bitmap *self)
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{
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for (size_t i = 0; i < self->n_elem; ++i)
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self->data[i] = 0;
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}
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static inline int bitmap_is_empty(const struct bitmap *self)
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{
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for (size_t i = 0; i < self->n_elem; ++i)
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if (self->data[i])
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return 0;
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return 1;
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}
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static inline int bitmap_is_set(const struct bitmap *self, int index)
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{
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return !!(self->data[index / 64] & (1ULL << (index % 64)));
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}
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static inline void bitmap_clear(struct bitmap* self, int index)
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{
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self->data[index / 64] &= ~(1ULL << (index % 64));
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}
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static inline void bitmap_set_cond(struct bitmap* self, int index, bool cond)
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{
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self->data[index / 64] |= ((uint64_t)cond) << (index % 64);
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}
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static inline void bitmap_set(struct bitmap* self, int index)
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{
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bitmap_set_cond(self, index, true);
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}
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static inline int bitmap_runlength(const struct bitmap *self, int start)
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{
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int r = 0;
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while (bitmap_is_set(self, start + r)) ++r;
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return r;
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}
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