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/*
* Copyright © 2010 Codethink Limited
*
* 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 of the licence, 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Ryan Lortie <desrt@desrt.ca>
*/
#include "dconf-rebuilder.h"
#include <string.h>
#include "gvdb-reader.h"
#include "gvdb-builder.h"
typedef struct
{
const gchar *prefix;
gint prefix_len;
GHashTable *table;
const gchar *const*keys;
GVariant *const*values;
gint n_items;
gint index;
gchar name[4096];
gint name_len;
} DConfRebuilderState;
static GvdbItem *
dconf_rebuilder_get_parent (GHashTable *table,
gchar *key,
gint length)
{
GvdbItem *grandparent, *parent;
if (length == 1)
return NULL;
while (key[--length - 1] != '/');
key[length] = '\0';
parent = g_hash_table_lookup (table, key);
if (parent == NULL)
{
parent = gvdb_hash_table_insert (table, key);
grandparent = dconf_rebuilder_get_parent (table, key, length);
if (grandparent != NULL)
gvdb_item_set_parent (parent, grandparent);
}
return parent;
}
static void
dconf_rebuilder_insert (GHashTable *table,
const gchar *key,
GVariant *value)
{
GvdbItem *item;
gchar *mykey;
gint length;
length = strlen (key);
mykey = g_alloca (length);
memcpy (mykey, key, length);
g_assert (g_hash_table_lookup (table, key) == NULL);
item = gvdb_hash_table_insert (table, key);
gvdb_item_set_parent (item,
dconf_rebuilder_get_parent (table, mykey, length));
gvdb_item_set_value (item, value);
}
static void
dconf_rebuilder_put_item (DConfRebuilderState *state)
{
if (state->values[state->index] != NULL)
{
gchar *fullname;
fullname = g_strconcat (state->prefix, state->keys[state->index], NULL);
dconf_rebuilder_insert (state->table, fullname, state->values[state->index]);
g_free (fullname);
}
state->index++;
}
static gboolean
dconf_rebuilder_walk_name (DConfRebuilderState *state,
const gchar *name,
gsize name_len)
{
gint cmp;
g_assert (state->name_len + name_len < sizeof state->name - 1);
memcpy (state->name + state->name_len, name, name_len);
state->name[state->name_len + name_len] = '\0';
if (state->index == state->n_items)
return TRUE;
if (state->name_len + name_len < state->prefix_len ||
memcmp (state->name, state->prefix, state->prefix_len) != 0)
return TRUE;
while ((cmp = strcmp (state->name + state->prefix_len,
state->keys[state->index])) > 0)
{
dconf_rebuilder_put_item (state);
if (state->index == state->n_items)
return TRUE;
}
return cmp != 0;
}
static void
dconf_rebuilder_walk_value (const gchar *name,
gsize name_len,
GVariant *value,
gpointer user_data)
{
DConfRebuilderState *state = user_data;
if (dconf_rebuilder_walk_name (state, name, name_len))
dconf_rebuilder_insert (state->table, state->name, value);
else
dconf_rebuilder_put_item (state);
}
static gboolean
dconf_rebuilder_walk_open (const gchar *name,
gsize name_len,
gpointer user_data)
{
DConfRebuilderState *state = user_data;
if (dconf_rebuilder_walk_name (state, name, name_len))
{
state->name_len += name_len;
return TRUE;
}
return FALSE;
}
static void
dconf_rebuilder_walk_close (gsize name_len,
gpointer user_data)
{
DConfRebuilderState *state = user_data;
state->name_len -= name_len;
}
gboolean
dconf_rebuilder_rebuild (const gchar *filename,
const gchar *prefix,
const gchar *const*keys,
GVariant *const*values,
int n_items,
GError **error)
{
DConfRebuilderState state = { prefix, strlen (prefix),
0, keys, values, n_items };
gboolean success;
GvdbTable *old;
state.table = gvdb_hash_table_new (NULL, NULL);
if ((old = gvdb_table_new (filename, FALSE, NULL)))
{
gvdb_table_walk (old, "/",
dconf_rebuilder_walk_open,
dconf_rebuilder_walk_value,
dconf_rebuilder_walk_close,
&state);
gvdb_table_unref (old);
}
while (state.index != state.n_items)
dconf_rebuilder_put_item (&state);
success = gvdb_table_write_contents (state.table, filename, FALSE, error);
g_hash_table_unref (state.table);
return success;
}
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