text: /*
   * 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);
  void sqfs_cache_invalidate(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
  