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/*
* LibSylph -- E-Mail client library
* Copyright (C) 1999-2005 Hiroyuki Yamamoto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <glib.h>
#include <string.h>
#include "stringtable.h"
#include "utils.h"
/* alfons - hashed string table (I wasn't content with GStringChunk;
* can't recall why :-) */
#if 0
#define XXX_DEBUG \
debug_print
#else
#define XXX_DEBUG \
if (0) debug_print
#endif
typedef struct StringEntry_ {
gint ref_count;
gchar *string;
} StringEntry;
static StringEntry *string_entry_new(const gchar *str)
{
StringEntry *entry;
entry = g_new0(StringEntry, 1);
entry->ref_count = 1;
entry->string = g_strdup(str);
return entry;
}
static void string_entry_free(StringEntry *entry)
{
g_return_if_fail(entry != NULL);
g_free(entry->string);
g_free(entry);
}
StringTable *string_table_new(void)
{
StringTable *strtable;
strtable = g_new0(StringTable, 1);
g_return_val_if_fail(strtable != NULL, NULL);
strtable->hash_table = g_hash_table_new(g_str_hash, g_str_equal);
g_return_val_if_fail(strtable->hash_table, NULL);
return strtable;
}
gchar *string_table_lookup_string(StringTable *table, const gchar *str)
{
StringEntry *entry;
entry = g_hash_table_lookup(table->hash_table, str);
if (entry) {
return entry->string;
} else {
return NULL;
}
}
gchar *string_table_insert_string(StringTable *table, const gchar *str)
{
StringEntry *entry;
entry = g_hash_table_lookup(table->hash_table, str);
if (entry) {
entry->ref_count++;
XXX_DEBUG ("ref++ for %s (%d)\n", entry->string,
entry->ref_count);
} else {
entry = string_entry_new(str);
XXX_DEBUG ("inserting %s\n", str);
/* insert entry->string instead of str, since it can be
* invalid pointer after this. */
g_hash_table_insert(table->hash_table, entry->string, entry);
}
return entry->string;
}
void string_table_free_string(StringTable *table, const gchar *str)
{
StringEntry *entry;
entry = g_hash_table_lookup(table->hash_table, str);
if (entry) {
entry->ref_count--;
if (entry->ref_count <= 0) {
XXX_DEBUG ("refcount of string %s dropped to zero\n",
entry->string);
g_hash_table_remove(table->hash_table, str);
string_entry_free(entry);
} else {
XXX_DEBUG ("ref-- for %s (%d)\n", entry->string,
entry->ref_count);
}
}
}
static gboolean string_table_remove_for_each_fn(gchar *key, StringEntry *entry,
gpointer user_data)
{
g_return_val_if_fail(key != NULL, TRUE);
g_return_val_if_fail(entry != NULL, TRUE);
string_entry_free(entry);
return TRUE;
}
void string_table_free(StringTable *table)
{
g_return_if_fail(table != NULL);
g_return_if_fail(table->hash_table != NULL);
g_hash_table_foreach_remove(table->hash_table,
(GHRFunc)string_table_remove_for_each_fn,
NULL);
g_hash_table_destroy(table->hash_table);
g_free(table);
}
static void string_table_stats_for_each_fn(gchar *key, StringEntry *entry,
guint *totals)
{
if (entry->ref_count > 1) {
*totals += strlen(key) * (entry->ref_count - 1);
}
}
void string_table_get_stats(StringTable *table)
{
guint totals = 0;
g_hash_table_foreach(table->hash_table,
(GHFunc)string_table_stats_for_each_fn, &totals);
XXX_DEBUG ("TOTAL UNSPILLED %d (%dK)\n", totals, totals / 1024);
}
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