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extern KEY_CACHE dflt_key_cache_var, *dflt_key_cache;
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extern int init_key_cache(KEY_CACHE *keycache, uint32_t key_cache_block_size,
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extern int resize_key_cache(KEY_CACHE *keycache, uint32_t key_cache_block_size,
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extern unsigned char *key_cache_read(KEY_CACHE *keycache,
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int file, my_off_t filepos, int level,