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cache.h
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cache.h
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/*
* Copyright (c) 2012 Dave Vasilevsky <dave@vasilevsky.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SQFS_CACHE_H
#define SQFS_CACHE_H
#include "common.h"
/* Really simplistic cache
* - Linear search
* - Linear eviction
* - No thread safety
* - Misses are caller's responsibility
*/
#define SQFS_CACHE_IDX_INVALID 0
typedef uint64_t sqfs_cache_idx;
typedef void (*sqfs_cache_dispose)(void* data);
typedef struct {
sqfs_cache_idx *idxs;
uint8_t *buf;
sqfs_cache_dispose dispose;
size_t size, count;
size_t next; /* next block to evict */
} sqfs_cache;
sqfs_err sqfs_cache_init(sqfs_cache *cache, size_t size, size_t count,
sqfs_cache_dispose dispose);
void sqfs_cache_destroy(sqfs_cache *cache);
void *sqfs_cache_get(sqfs_cache *cache, sqfs_cache_idx idx);
void *sqfs_cache_add(sqfs_cache *cache, sqfs_cache_idx idx);
typedef struct {
sqfs_block *block;
size_t data_size;
} sqfs_block_cache_entry;
sqfs_err sqfs_block_cache_init(sqfs_cache *cache, size_t count);
#endif