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PIKApp/app/core/pika-internal-data.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995-2002 Spencer Kimball, Peter Mattis, and others
*
* pika-internal-data.c
* Copyright (C) 2017 Ell
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "libpikabase/pikabase.h"
#include "core-types.h"
#include "pika.h"
#include "pika-gradients.h"
#include "pika-internal-data.h"
#include "pikadata.h"
#include "pikadataloaderfactory.h"
#include "pikaerror.h"
#include "pikagradient-load.h"
#include "pika-intl.h"
#define PIKA_INTERNAL_DATA_DIRECTORY "internal-data"
typedef PikaData * (* PikaDataGetFunc) (Pika *pika);
typedef struct _PikaInternalDataFile PikaInternalDataFile;
struct _PikaInternalDataFile
{
const gchar *name;
PikaDataGetFunc get_func;
PikaDataLoadFunc load_func;
};
/* local function prototypes */
static gboolean pika_internal_data_create_directory (GError **error);
static GFile * pika_internal_data_get_file (const PikaInternalDataFile *data_file);
static gboolean pika_internal_data_load_data_file (Pika *pika,
const PikaInternalDataFile *data_file,
GError **error);
static gboolean pika_internal_data_save_data_file (Pika *pika,
const PikaInternalDataFile *data_file,
GError **error);
static gboolean pika_internal_data_delete_data_file (Pika *pika,
const PikaInternalDataFile *data_file,
GError **error);
/* static variables */
static const PikaInternalDataFile internal_data_files[] =
{
/* Custom gradient */
{
.name = "custom" PIKA_GRADIENT_FILE_EXTENSION,
.get_func = (PikaDataGetFunc) pika_gradients_get_custom,
.load_func = pika_gradient_load
}
};
/* public functions */
gboolean
pika_internal_data_load (Pika *pika,
GError **error)
{
gint i;
g_return_val_if_fail (PIKA_IS_PIKA (pika), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
for (i = 0; i < G_N_ELEMENTS (internal_data_files); i++)
{
const PikaInternalDataFile *data_file = &internal_data_files[i];
if (! pika_internal_data_load_data_file (pika, data_file, error))
return FALSE;
}
return TRUE;
}
gboolean
pika_internal_data_save (Pika *pika,
GError **error)
{
gint i;
g_return_val_if_fail (PIKA_IS_PIKA (pika), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (! pika_internal_data_create_directory (error))
return FALSE;
for (i = 0; i < G_N_ELEMENTS (internal_data_files); i++)
{
const PikaInternalDataFile *data_file = &internal_data_files[i];
if (! pika_internal_data_save_data_file (pika, data_file, error))
return FALSE;
}
return TRUE;
}
gboolean
pika_internal_data_clear (Pika *pika,
GError **error)
{
gint i;
g_return_val_if_fail (PIKA_IS_PIKA (pika), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
for (i = 0; i < G_N_ELEMENTS (internal_data_files); i++)
{
const PikaInternalDataFile *data_file = &internal_data_files[i];
if (! pika_internal_data_delete_data_file (pika, data_file, error))
return FALSE;
}
return TRUE;
}
/* private functions */
static gboolean
pika_internal_data_create_directory (GError **error)
{
GFile *directory;
GError *my_error = NULL;
gboolean success;
directory = pika_directory_file (PIKA_INTERNAL_DATA_DIRECTORY, NULL);
success = g_file_make_directory (directory, NULL, &my_error);
g_object_unref (directory);
if (! success)
{
if (my_error->code == G_IO_ERROR_EXISTS)
{
g_clear_error (&my_error);
success = TRUE;
}
else
{
g_propagate_error (error, my_error);
}
}
return success;
}
static GFile *
pika_internal_data_get_file (const PikaInternalDataFile *data_file)
{
return pika_directory_file (PIKA_INTERNAL_DATA_DIRECTORY,
data_file->name,
NULL);
}
static gboolean
pika_internal_data_load_data_file (Pika *pika,
const PikaInternalDataFile *data_file,
GError **error)
{
GFile *file;
GInputStream *input;
PikaData *data;
GList *list;
GError *my_error = NULL;
file = pika_internal_data_get_file (data_file);
if (pika->be_verbose)
g_print ("Parsing '%s'\n", pika_file_get_utf8_name (file));
input = G_INPUT_STREAM (g_file_read (file, NULL, &my_error));
if (! input)
{
g_object_unref (file);
if (my_error->code == G_IO_ERROR_NOT_FOUND)
{
g_clear_error (&my_error);
return TRUE;
}
else
{
g_propagate_error (error, my_error);
return FALSE;
}
}
list = data_file->load_func (pika->user_context, file, input, error);
g_object_unref (input);
g_object_unref (file);
if (! list)
return FALSE;
data = data_file->get_func (pika);
pika_data_copy (data, PIKA_DATA (list->data));
g_list_free_full (list, g_object_unref);
return TRUE;
}
static gboolean
pika_internal_data_save_data_file (Pika *pika,
const PikaInternalDataFile *data_file,
GError **error)
{
GFile *file;
GOutputStream *output;
PikaData *data;
gboolean success;
file = pika_internal_data_get_file (data_file);
if (pika->be_verbose)
g_print ("Writing '%s'\n", pika_file_get_utf8_name (file));
output = G_OUTPUT_STREAM (g_file_replace (file, NULL, FALSE,
G_FILE_CREATE_NONE,
NULL, error));
if (! output)
{
g_object_unref (file);
return FALSE;
}
data = data_file->get_func (pika);
/* we bypass pika_data_save() and call the data's save() virtual function
* directly, since pika_data_save() is a nop for internal data.
*
* FIXME: we save the data whether it's dirty or not, since it might not
* exist on disk. currently, we only use this for cheap data, such as
* gradients, so this is not a big concern, but if we save more expensive
* data in the future, we should fix this.
*/
pika_assert (PIKA_DATA_GET_CLASS (data)->save);
success = PIKA_DATA_GET_CLASS (data)->save (data, output, error);
if (success)
{
if (! g_output_stream_close (output, NULL, error))
{
g_prefix_error (error,
_("Error saving '%s': "),
pika_file_get_utf8_name (file));
success = FALSE;
}
}
else
{
GCancellable *cancellable = g_cancellable_new ();
g_cancellable_cancel (cancellable);
if (error && *error)
{
g_prefix_error (error,
_("Error saving '%s': "),
pika_file_get_utf8_name (file));
}
else
{
g_set_error (error, PIKA_DATA_ERROR, PIKA_DATA_ERROR_WRITE,
_("Error saving '%s'"),
pika_file_get_utf8_name (file));
}
g_output_stream_close (output, cancellable, NULL);
g_object_unref (cancellable);
}
g_object_unref (output);
g_object_unref (file);
return success;
}
static gboolean
pika_internal_data_delete_data_file (Pika *pika,
const PikaInternalDataFile *data_file,
GError **error)
{
GFile *file;
GError *my_error = NULL;
gboolean success = TRUE;
file = pika_internal_data_get_file (data_file);
if (pika->be_verbose)
g_print ("Deleting '%s'\n", pika_file_get_utf8_name (file));
if (! g_file_delete (file, NULL, &my_error) &&
my_error->code != G_IO_ERROR_NOT_FOUND)
{
success = FALSE;
g_set_error (error, PIKA_ERROR, PIKA_FAILED,
_("Deleting \"%s\" failed: %s"),
pika_file_get_utf8_name (file), my_error->message);
}
g_clear_error (&my_error);
g_object_unref (file);
return success;
}
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