herrie/src/vfs_cache.c

   1 /*
   2  * Copyright (c) 2006-2011 Ed Schouten <ed@80386.nl>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26 /**
  27  * @file vfs_cache.c
  28  * @brief Virtual filesystem cache.
  29  */
  30
  31 #include "stdinc.h"
  32
  33 #include "config.h"
  34 #include "gui.h"
  35 #include "vfs.h"
  36
  37 static GHashTable *refcache = NULL;
  38
  39 static void
  40 vfs_cache_destroyvalue(gpointer data)
  41 {
  42         struct vfsref *vr = data;
  43
  44         vfs_close(vr);
  45 }
  46
  47 void
  48 vfs_cache_init(void)
  49 {
  50         if (!config_getopt_bool("vfs.cache"))
  51                 return;
  52         refcache = g_hash_table_new_full(g_str_hash, g_str_equal, NULL,
  53             vfs_cache_destroyvalue);
  54 }
  55
  56 void
  57 vfs_cache_purge(void)
  58 {
  59         if (refcache != NULL) {
  60                 g_hash_table_remove_all(refcache);
  61                 gui_msgbar_warn(_("VFS cache purged."));
  62         }
  63 }
  64
  65 void
  66 vfs_cache_add(const struct vfsref *nvr)
  67 {
  68         struct vfsref *vr;
  69
  70         if (refcache != NULL) {
  71                 vr = vfs_dup(nvr);
  72                 g_hash_table_replace(refcache, vr->ent->filename, vr);
  73         }
  74 }
  75
  76 struct vfsref *
  77 vfs_cache_lookup(const char *filename)
  78 {
  79         struct vfsref *vr;
  80
  81         if (refcache != NULL) {
  82                 vr = g_hash_table_lookup(refcache, filename);
  83                 if (vr != NULL)
  84                         return vfs_dup(vr);
  85         }
  86         return (NULL);
  87 }