1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/file_cache.c	Sat Feb 20 21:18:28 2010 -0800
     1.3 @@ -0,0 +1,202 @@
     1.4 +/*
     1.5 + * $Id: file_cache.c,v 1.15 2004/03/24 06:28:16 hipnod Exp $
     1.6 + *
     1.7 + * Copyright (C) 2001-2003 giFT project (gift.sourceforge.net)
     1.8 + *
     1.9 + * This program is free software; you can redistribute it and/or modify it
    1.10 + * under the terms of the GNU General Public License as published by the
    1.11 + * Free Software Foundation; either version 2, or (at your option) any
    1.12 + * later version.
    1.13 + *
    1.14 + * This program is distributed in the hope that it will be useful, but
    1.15 + * WITHOUT ANY WARRANTY; without even the implied warranty of
    1.16 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    1.17 + * General Public License for more details.
    1.18 + */
    1.19 +
    1.20 +#include "gt_gnutella.h"
    1.21 +
    1.22 +#include "file_cache.h"
    1.23 +
    1.24 +/*****************************************************************************/
    1.25 +
    1.26 +FileCache *file_cache_new (const char *file)
    1.27 +{
    1.28 +	FileCache *file_cache;
    1.29 +
    1.30 +	if (!(file_cache = malloc (sizeof (FileCache))))
    1.31 +		return NULL;
    1.32 +
    1.33 +	memset (file_cache, 0, sizeof (FileCache));
    1.34 +
    1.35 +	file_cache->file = STRDUP (file);
    1.36 +
    1.37 +	if (!file_cache_load (file_cache))
    1.38 +		GT->DBGFN (GT, "failed loading %s", file);
    1.39 +
    1.40 +	return file_cache;
    1.41 +}
    1.42 +
    1.43 +void file_cache_free (FileCache *cache)
    1.44 +{
    1.45 +	if (!cache)
    1.46 +		return;
    1.47 +
    1.48 +	dataset_clear (cache->d);
    1.49 +
    1.50 +	free (cache->file);
    1.51 +	free (cache);
    1.52 +}
    1.53 +
    1.54 +/*****************************************************************************/
    1.55 +
    1.56 +int file_cache_load (FileCache *cache)
    1.57 +{
    1.58 +	struct stat st;
    1.59 +	time_t      mtime;
    1.60 +	char       *line  = NULL;
    1.61 +	FILE       *f;
    1.62 +	int         nlines;
    1.63 +
    1.64 +	if (!cache)
    1.65 +		return FALSE;
    1.66 +
    1.67 +	if (!(f = fopen (cache->file, "r")))
    1.68 +	{
    1.69 +		GT->DBGFN (GT, "couldnt open %s for reading: %s", cache->file,
    1.70 +		           GIFT_STRERROR ());
    1.71 +		return FALSE;
    1.72 +	}
    1.73 +
    1.74 +	mtime = 0;
    1.75 +
    1.76 +	if (file_stat (cache->file, &st))
    1.77 +		mtime = st.st_mtime;
    1.78 +
    1.79 +	dataset_clear (cache->d);
    1.80 +
    1.81 +	cache->d     = dataset_new (DATASET_HASH);
    1.82 +	cache->mtime = mtime;
    1.83 +
    1.84 +	nlines = 0;
    1.85 +
    1.86 +	while (file_read_line (f, &line))
    1.87 +	{
    1.88 +		char *key;
    1.89 +		char *value = line;
    1.90 +
    1.91 +		key = string_sep (&value, " ");
    1.92 +
    1.93 +		string_trim (key);
    1.94 +		string_trim (value);
    1.95 +
    1.96 +		if (!key)
    1.97 +			continue;
    1.98 +
    1.99 +		if (!value)
   1.100 +			value = "";
   1.101 +
   1.102 +		dataset_insertstr (&cache->d, key, value);
   1.103 +
   1.104 +		nlines++;
   1.105 +	}
   1.106 +
   1.107 +	if (fclose (f) != 0)
   1.108 +		return FALSE;
   1.109 +
   1.110 +	GT->DBGFN (GT, "loaded filecache for %s. nlines = %i", cache->file, nlines);
   1.111 +	return TRUE;
   1.112 +}
   1.113 +
   1.114 +static void sync_one (ds_data_t *key, ds_data_t *value, String *s)
   1.115 +{
   1.116 +	char *keystr   = key->data;
   1.117 +	char *valuestr = value->data;
   1.118 +
   1.119 +	string_appendf (s, "%s %s\n", keystr, valuestr);
   1.120 +}
   1.121 +
   1.122 +BOOL file_cache_sync (FileCache *cache)
   1.123 +{
   1.124 +	FILE    *f;
   1.125 +	String  *s;
   1.126 +	char     tmp_path[PATH_MAX];
   1.127 +
   1.128 +	if (!cache)
   1.129 +		return FALSE;
   1.130 +
   1.131 +	snprintf (tmp_path, sizeof (tmp_path), "%s.tmp", cache->file);
   1.132 +
   1.133 +	if (!(s = string_new (NULL, 0, 0, TRUE)))
   1.134 +		return FALSE;
   1.135 +
   1.136 +	if (!(f = fopen (tmp_path, "w")))
   1.137 +	{
   1.138 +		GT->DBGFN (GT, "couldnt write to %s: %s", tmp_path, GIFT_STRERROR ());
   1.139 +		string_free (s);
   1.140 +		return FALSE;
   1.141 +	}
   1.142 +
   1.143 +	GT->DBGFN (GT, "syncing %s to disk", tmp_path);
   1.144 +
   1.145 +	dataset_foreach (cache->d, DS_FOREACH(sync_one), s);
   1.146 +
   1.147 +	if (fwrite (s->str, 1, s->len, f) != s->len)
   1.148 +	{
   1.149 +		GT->DBGFN (GT, "failed writing %s: %s", tmp_path, GIFT_STRERROR());
   1.150 +		string_free (s);
   1.151 +		fclose (f);
   1.152 +		return FALSE;
   1.153 +	}
   1.154 +
   1.155 +	string_free (s);
   1.156 +
   1.157 +	if (fclose (f) != 0)
   1.158 +	{
   1.159 +		GT->DBGFN (GT, "failed closing %s: %s", tmp_path, GIFT_STRERROR());
   1.160 +		return FALSE;
   1.161 +	}
   1.162 +
   1.163 +	if (!file_mv (tmp_path, cache->file))
   1.164 +	{
   1.165 +		GT->DBGFN (GT, "file move %s -> %s failed", tmp_path, cache->file);
   1.166 +		return FALSE;
   1.167 +	}
   1.168 +
   1.169 +	return TRUE;
   1.170 +}
   1.171 +
   1.172 +void file_cache_flush (FileCache *cache)
   1.173 +{
   1.174 +	if (!cache)
   1.175 +		return;
   1.176 +
   1.177 +	dataset_clear (cache->d);
   1.178 +	cache->d = NULL;
   1.179 +}
   1.180 +
   1.181 +/*****************************************************************************/
   1.182 +
   1.183 +char *file_cache_lookup (FileCache *cache, const char *key)
   1.184 +{
   1.185 +	if (!cache)
   1.186 +		return NULL;
   1.187 +
   1.188 +	return dataset_lookupstr (cache->d, key);
   1.189 +}
   1.190 +
   1.191 +void file_cache_insert (FileCache *cache, const char *key, const char *value)
   1.192 +{
   1.193 +	if (!cache)
   1.194 +		return;
   1.195 +
   1.196 +	dataset_insertstr (&cache->d, key, value);
   1.197 +}
   1.198 +
   1.199 +void file_cache_remove (FileCache *cache, const char *key)
   1.200 +{
   1.201 +	if (!cache)
   1.202 +		return;
   1.203 +
   1.204 +	dataset_removestr (cache->d, key);
   1.205 +}