155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/*
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* e-poolv.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) version 3.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with the program; if not, see <http://www.gnu.org/licenses/>
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "e-poolv.h"
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#include <string.h>
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#include <camel/camel.h>
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struct _EPoolv {
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guchar length;
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gchar *s[1];
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};
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static GHashTable *poolv_pool;
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static CamelMemPool *poolv_mempool;
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G_LOCK_DEFINE_STATIC (poolv);
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/**
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* e_poolv_new:
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* @size: The number of elements in the poolv, maximum of 254 elements.
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*
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* Create a new #EPoolv: a string vector which shares a global string
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* pool. An #EPoolv can be used to work with arrays of strings which
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* save memory by eliminating duplicated allocations of the same string.
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*
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* This is useful when you have a log of read-only strings that do not
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* go away and are duplicated a lot, such as email headers.
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*
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* Returns: a new #EPoolv
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**/
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EPoolv *
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e_poolv_new (guint size)
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{
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EPoolv *poolv;
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g_return_val_if_fail (size < 255, NULL);
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poolv = g_malloc0 (sizeof (*poolv) + (size - 1) * sizeof (gchar *));
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poolv->length = size;
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G_LOCK (poolv);
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if (!poolv_pool)
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poolv_pool = g_hash_table_new (g_str_hash, g_str_equal);
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if (!poolv_mempool)
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poolv_mempool = camel_mempool_new (
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32 * 1024, 512, CAMEL_MEMPOOL_ALIGN_BYTE);
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G_UNLOCK (poolv);
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return poolv;
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}
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/**
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* e_poolv_set:
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* @poolv: pooled string vector
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* @index: index in vector of string
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* @str: string to set
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* @freeit: whether the caller is releasing its reference to the
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* string
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*
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* Set a string vector reference. If the caller will no longer be
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* referencing the string, freeit should be TRUE. Otherwise, this
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* will duplicate the string if it is not found in the pool.
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*
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* Returns: @poolv
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**/
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EPoolv *
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e_poolv_set (EPoolv *poolv,
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gint index,
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gchar *str,
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gint freeit)
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{
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g_return_val_if_fail (poolv != NULL, NULL);
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g_return_val_if_fail (index >= 0 && index < poolv->length, NULL);
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if (!str) {
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poolv->s[index] = NULL;
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return poolv;
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}
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G_LOCK (poolv);
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if ((poolv->s[index] = g_hash_table_lookup (poolv_pool, str)) != NULL) {
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} else {
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poolv->s[index] = camel_mempool_strdup (poolv_mempool, str);
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g_hash_table_insert (poolv_pool, poolv->s[index], poolv->s[index]);
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}
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G_UNLOCK (poolv);
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if (freeit)
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g_free (str);
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return poolv;
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}
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/**
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* e_poolv_get:
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* @poolv: pooled string vector
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* @index: index in vector of string
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*
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* Retrieve a string by index. This could possibly just be a macro.
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*
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* Since the pool is never freed, this string does not need to be
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* duplicated, but should not be modified.
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*
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* Returns: string at that index.
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**/
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const gchar *
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e_poolv_get (EPoolv *poolv,
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gint index)
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{
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g_return_val_if_fail (poolv != NULL, NULL);
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g_return_val_if_fail (index >= 0 && index < poolv->length, NULL);
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return poolv->s[index] ? poolv->s[index] : "";
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}
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/**
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* e_poolv_destroy:
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* @poolv: pooled string vector to free
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*
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* Free a pooled string vector. This doesn't free the strings from
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* the vector, however.
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**/
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void
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e_poolv_destroy (EPoolv *poolv)
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{
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g_return_if_fail (poolv != NULL);
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g_free (poolv);
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}
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