#ifndef HASHMAP_H

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# define HASHMAP_H

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# include <stdlib.h>

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# include <stdint.h>

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#ifndef __GNUC_PREREQ

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#if defined(__GNUC__) && defined(__GNUC_MINOR__)

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#define __GNUC_PREREQ(maj, min) \

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((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))

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#else

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#define __GNUC_PREREQ(maj, min) 0

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#endif

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#endif

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struct ext2fs_hashmap {

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uint32_t size;

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uint32_t(*hash)(const void *key, size_t len);

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void(*free)(void*);

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struct ext2fs_hashmap_entry *first;

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struct ext2fs_hashmap_entry *last;

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struct ext2fs_hashmap_entry {

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void *data;

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const void *key;

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size_t key_len;

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struct ext2fs_hashmap_entry *next;

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struct ext2fs_hashmap_entry *list_next;

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struct ext2fs_hashmap_entry *list_prev;

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#if __GNUC_PREREQ (4, 8)

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#pragma GCC diagnostic push

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#pragma GCC diagnostic ignored "-Wpedantic"

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#endif

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} *entries[0];

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#if __GNUC_PREREQ (4, 8)

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#pragma GCC diagnostic pop

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#endif

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};

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struct ext2fs_hashmap *ext2fs_hashmap_create(

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uint32_t(*hash_fct)(const void*, size_t),

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void(*free_fct)(void*), size_t size);

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void ext2fs_hashmap_add(struct ext2fs_hashmap *h, void *data, const void *key,

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size_t key_len);

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void *ext2fs_hashmap_lookup(struct ext2fs_hashmap *h, const void *key,

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size_t key_len);

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void *ext2fs_hashmap_iter_in_order(struct ext2fs_hashmap *h,

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struct ext2fs_hashmap_entry **it);

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void ext2fs_hashmap_del(struct ext2fs_hashmap *h,

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struct ext2fs_hashmap_entry *e);

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void ext2fs_hashmap_free(struct ext2fs_hashmap *h);

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uint32_t ext2fs_djb2_hash(const void *str, size_t size);

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#endif /* !HASHMAP_H */

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