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authornobody <nobody@localhost>2001-07-26 10:23:33 +0800
committernobody <nobody@localhost>2001-07-26 10:23:33 +0800
commitbd56ec56c662ba26f29690524fbe8d313be6118f (patch)
tree5c64260398fbee96c8074faef3fb06bf6ce67706 /camel/camel-uid-cache.c
parent9cf5ba1797448f8a2eb28add9f6b07c6adb31495 (diff)
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Diffstat (limited to 'camel/camel-uid-cache.c')
-rw-r--r--camel/camel-uid-cache.c240
1 files changed, 0 insertions, 240 deletions
diff --git a/camel/camel-uid-cache.c b/camel/camel-uid-cache.c
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--- a/camel/camel-uid-cache.c
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-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-/* camel-uid-cache.c: UID caching code. */
-
-/*
- * Authors:
- * Dan Winship <danw@ximian.com>
- *
- * Copyright 2000 Ximian, Inc. (www.ximian.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <errno.h>
-#include <fcntl.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "camel-uid-cache.h"
-
-struct _uid_state {
- int level;
- gboolean save;
-};
-
-static void free_uid (gpointer key, gpointer value, gpointer data);
-static void maybe_write_uid (gpointer key, gpointer value, gpointer data);
-
-/**
- * camel_uid_cache_new:
- * @filename: path to load the cache from
- *
- * Creates a new UID cache, initialized from @filename. If @filename
- * doesn't already exist, the UID cache will be empty. Otherwise, if
- * it does exist but can't be read, the function will return %NULL.
- *
- * Return value: a new UID cache, or %NULL
- **/
-CamelUIDCache *
-camel_uid_cache_new (const char *filename)
-{
- CamelUIDCache *cache;
- struct stat st;
- char *buf, **uids;
- int fd, i;
-
- fd = open (filename, O_RDWR | O_CREAT, 0700);
- if (fd == -1)
- return NULL;
-
- if (fstat (fd, &st) != 0) {
- close (fd);
- return NULL;
- }
- buf = g_malloc (st.st_size + 1);
-
- if (read (fd, buf, st.st_size) == -1) {
- close (fd);
- g_free (buf);
- return NULL;
- }
- buf[st.st_size] = '\0';
-
- cache = g_new (CamelUIDCache, 1);
- cache->fd = fd;
- cache->level = 1;
- cache->uids = g_hash_table_new (g_str_hash, g_str_equal);
-
- uids = g_strsplit (buf, "\n", 0);
- g_free (buf);
- for (i = 0; uids[i]; i++) {
- struct _uid_state *state;
-
- state = g_new (struct _uid_state, 1);
- state->level = cache->level;
- state->save = TRUE;
-
- g_hash_table_insert (cache->uids, uids[i], state);
- }
- g_free (uids);
-
- return cache;
-}
-
-/**
- * camel_uid_cache_save:
- * @cache: a CamelUIDCache
- *
- * Attempts to save @cache back to disk.
- *
- * Return value: success or failure
- **/
-gboolean
-camel_uid_cache_save (CamelUIDCache *cache)
-{
- if (lseek (cache->fd, 0, SEEK_SET) != 0)
- return FALSE;
- g_hash_table_foreach (cache->uids, maybe_write_uid, cache);
- return ftruncate (cache->fd, lseek (cache->fd, 0, SEEK_CUR)) == 0;
-}
-
-static void
-maybe_write_uid (gpointer key, gpointer value, gpointer data)
-{
- CamelUIDCache *cache = data;
- struct _uid_state *state = value;
-
- if (state && state->level == cache->level && state->save) {
- write (cache->fd, key, strlen (key));
- write (cache->fd, "\n", 1);
- }
-}
-
-
-/**
- * camel_uid_cache_destroy:
- * @cache: a CamelUIDCache
- *
- * Destroys @cache and frees its data.
- **/
-void
-camel_uid_cache_destroy (CamelUIDCache *cache)
-{
- g_hash_table_foreach (cache->uids, free_uid, NULL);
- g_hash_table_destroy (cache->uids);
- close (cache->fd);
- g_free (cache);
-}
-
-static void
-free_uid (gpointer key, gpointer value, gpointer data)
-{
- g_free (key);
- g_free (value);
-}
-
-
-/**
- * camel_uid_cache_get_new_uids:
- * @cache: a CamelUIDCache
- * @uids: an array of UIDs
- *
- * Returns an array of UIDs from @uids that are not in @cache, and
- * removes UIDs from @cache that aren't in @uids.
- *
- * Return value: an array of new UIDs, which must be freed with
- * camel_uid_cache_free_uids().
- **/
-GPtrArray *
-camel_uid_cache_get_new_uids (CamelUIDCache *cache, GPtrArray *uids)
-{
- GPtrArray *new_uids;
- gpointer old_uid;
- char *uid;
- int i;
-
- new_uids = g_ptr_array_new ();
- cache->level++;
-
- for (i = 0; i < uids->len; i++) {
- struct _uid_state *state;
-
- uid = uids->pdata[i];
- if (g_hash_table_lookup_extended (cache->uids, uid, &old_uid, &state)) {
- g_hash_table_remove (cache->uids, uid);
- g_free (old_uid);
- } else {
- g_ptr_array_add (new_uids, g_strdup (uid));
- state = g_new (struct _uid_state, 1);
- state->save = FALSE;
- }
-
- state->level = cache->level;
- g_hash_table_insert (cache->uids, g_strdup (uid), state);
- }
-
- return new_uids;
-}
-
-
-/**
- * camel_uid_cache_save_uid:
- * @cache: a CamelUIDCache
- * @uid: a uid to save
- *
- * Marks a uid for saving.
- **/
-void
-camel_uid_cache_save_uid (CamelUIDCache *cache, const char *uid)
-{
- struct _uid_state *state;
- gpointer old_uid;
-
- g_return_if_fail (uid != NULL);
-
- if (g_hash_table_lookup_extended (cache->uids, uid, &old_uid, &state)) {
- state->save = TRUE;
- state->level = cache->level;
- } else {
- state = g_new (struct _uid_state, 1);
- state->save = TRUE;
- state->level = cache->level;
-
- g_hash_table_insert (cache->uids, g_strdup (uid), state);
- }
-}
-
-
-/**
- * camel_uid_cache_free_uids:
- * @uids: an array returned from camel_uid_cache_get_new_uids()
- *
- * Frees the array of UIDs.
- **/
-void
-camel_uid_cache_free_uids (GPtrArray *uids)
-{
- int i;
-
- for (i = 0; i < uids->len; i++)
- g_free (uids->pdata[i]);
- g_ptr_array_free (uids, TRUE);
-}