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Diffstat (limited to '')
-rw-r--r-- | src/contrib/ucw/heap.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/contrib/ucw/heap.h b/src/contrib/ucw/heap.h new file mode 100644 index 0000000..7419b34 --- /dev/null +++ b/src/contrib/ucw/heap.h @@ -0,0 +1,46 @@ +/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz> + * + * 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, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but 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, see <http://www.gnu.org/licenses/>. + */ + +#pragma once + +struct heap_val { + int pos; +}; + +typedef struct heap_val heap_val_t; + +struct heap { + int num; /* Number of elements */ + int max_size; /* Size of allocated memory */ + int (*cmp)(void *, void *); + heap_val_t **data; +}; /* Array follows */ + +#define INITIAL_HEAP_SIZE 512 /* initial heap size */ +#define HEAP_INCREASE_STEP 2 /* multiplier for each inflation, keep conservative */ +#define HEAP_DECREASE_THRESHOLD 2 /* threshold for deflation, keep conservative */ +#define HELEMENT(h,num) ((h)->data + (num)) +#define HHEAD(h) HELEMENT((h), 1) +#define EMPTY_HEAP(h) ((h)->num == 0) /* h->num == 0 */ + +int heap_init(struct heap *, int (*cmp)(void *, void *), int); +void heap_deinit(struct heap *); + +void heap_delmin(struct heap *); +int heap_insert(struct heap *, heap_val_t *); +int heap_find(struct heap *, heap_val_t *); +void heap_delete(struct heap *, int); +void heap_replace(struct heap *h, int pos, heap_val_t *); |