gtk2/gdk/gdkcontentdeserializer.c
Ernestas Kulik 96d0368290 gdk: contentdeserializer: Fix deserializer not returning
file_uri_deserializer does not return on success, only on failure. This
commit fixes clipboard reads never finishing for some types.
2018-07-19 15:55:58 +03:00

851 lines
26 KiB
C

/* GTK - The GIMP Toolkit
* Copyright (C) 2017 Benjamin Otte
*
* 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 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gio/gio.h>
#include "gdkcontentdeserializer.h"
#include "gdkcontentformats.h"
#include "gdktexture.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
/**
* SECTION:gdkcontentdeserializer
* @Short_description: Deserialize content for transfer
* @Title: GdkContentDeserializer
* @See_also: #GdkContentSerializer
*
* A GdkContentDeserializer is used to deserialize content received via
* inter-application data transfers.
*/
typedef struct _Deserializer Deserializer;
struct _Deserializer
{
const char * mime_type; /* interned */
GType type;
GdkContentDeserializeFunc deserialize;
gpointer data;
GDestroyNotify notify;
};
GQueue deserializers = G_QUEUE_INIT;
static void init (void);
#define GDK_CONTENT_DESERIALIZER_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GDK_TYPE_CONTENT_DESERIALIZER, GdkContentDeserializerClass))
#define GDK_IS_CONTENT_DESERIALIZER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GDK_TYPE_CONTENT_DESERIALIZER))
#define GDK_CONTENT_DESERIALIZER_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GDK_TYPE_CONTENT_DESERIALIZER, GdkContentDeserializerClass))
typedef struct _GdkContentDeserializerClass GdkContentDeserializerClass;
struct _GdkContentDeserializer
{
GObject parent_instance;
const char *mime_type; /* interned */
GValue value;
GInputStream *stream;
int priority;
GCancellable *cancellable;
gpointer user_data;
GAsyncReadyCallback callback;
gpointer callback_data;
gpointer task_data;
GDestroyNotify task_notify;
GError *error;
gboolean returned;
};
struct _GdkContentDeserializerClass
{
GObjectClass parent_class;
};
static gpointer
gdk_content_deserializer_async_result_get_user_data (GAsyncResult *res)
{
return GDK_CONTENT_DESERIALIZER (res)->callback_data;
}
static GObject *
gdk_content_deserializer_async_result_get_source_object (GAsyncResult *res)
{
return NULL;
}
static void
gdk_content_deserializer_async_result_iface_init (GAsyncResultIface *iface)
{
iface->get_user_data = gdk_content_deserializer_async_result_get_user_data;
iface->get_source_object = gdk_content_deserializer_async_result_get_source_object;
}
G_DEFINE_TYPE_WITH_CODE (GdkContentDeserializer, gdk_content_deserializer, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_RESULT, gdk_content_deserializer_async_result_iface_init))
static void
gdk_content_deserializer_finalize (GObject *object)
{
GdkContentDeserializer *deserializer = GDK_CONTENT_DESERIALIZER (object);
g_value_unset (&deserializer->value);
g_clear_object (&deserializer->stream);
g_clear_object (&deserializer->cancellable);
g_clear_error (&deserializer->error);
if (deserializer->task_notify)
deserializer->task_notify (deserializer->task_data);
G_OBJECT_CLASS (gdk_content_deserializer_parent_class)->finalize (object);
}
static void
gdk_content_deserializer_class_init (GdkContentDeserializerClass *content_deserializer_class)
{
GObjectClass *object_class = G_OBJECT_CLASS (content_deserializer_class);
object_class->finalize = gdk_content_deserializer_finalize;
}
static void
gdk_content_deserializer_init (GdkContentDeserializer *content_deserializer)
{
}
static void
gdk_content_deserializer_run (const char *mime_type,
GType type,
GInputStream *stream,
int priority,
GCancellable *cancellable,
GdkContentDeserializeFunc deserialize_func,
gpointer user_data,
GAsyncReadyCallback callback,
gpointer callback_data)
{
GdkContentDeserializer *deserializer;
deserializer = g_object_new (GDK_TYPE_CONTENT_DESERIALIZER, NULL);
deserializer->mime_type = mime_type;
g_value_init (&deserializer->value, type);
deserializer->stream = g_object_ref (stream);
deserializer->priority = priority;
if (cancellable)
deserializer->cancellable = g_object_ref (cancellable);
deserializer->user_data = user_data;
deserializer->callback = callback;
deserializer->callback_data = callback_data;
deserialize_func (deserializer);
}
/**
* gdk_content_deserializer_get_mime_type:
* @deserializer: a #GdkContentDeserializer
*
* Gets the mime type to deserialize from.
*
* Returns: (transfer none): the mime type for the current operation
*/
const char *
gdk_content_deserializer_get_mime_type (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->mime_type;
}
/**
* gdk_content_deserializer_get_gtype:
* @deserializer: a #GdkContentDeserializer
*
* Gets the GType to create an instance of.
*
* Returns: the GType for the current operation
*/
GType
gdk_content_deserializer_get_gtype (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), G_TYPE_INVALID);
return G_VALUE_TYPE (&deserializer->value);
}
/**
* gdk_content_deserializer_get_value:
* @deserializer: a #GdkContentDeserializer
*
* Gets the #GValue to store the deserialized object in.
*
* Returns: (transfer none): the #GValue for the current operation
*/
GValue *
gdk_content_deserializer_get_value (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return &deserializer->value;
}
/**
* gdk_content_deserializer_get_input_stream:
* @deserializer: a #GdkContentDeserializer
*
* Gets the input stream that was passed to gdk_content_deserialize_async().
*
* Returns: (transfer none): the input stream for the current operation
*/
GInputStream *
gdk_content_deserializer_get_input_stream (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->stream;
}
/**
* gdk_content_deserializer_get_priority:
* @deserializer: a #GdkContentDeserializer
*
* Gets the io priority that was passed to gdk_content_deserialize_async().
*
* Returns: the io priority for the current operation
*/
int
gdk_content_deserializer_get_priority (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), G_PRIORITY_DEFAULT);
return deserializer->priority;
}
/**
* gdk_content_deserializer_get_cancellable:
* @deserializer: a #GdkContentDeserializer
*
* Gets the cancellable that was passed to gdk_content_deserialize_async().
*
* Returns: (transfer none): the cancellable for the current operation
*/
GCancellable *
gdk_content_deserializer_get_cancellable (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->cancellable;
}
/**
* gdk_content_deserializer_get_user_data:
* @deserializer: a #GdkContentDeserializer
*
* Gets the user data that was passed when the deserializer was registered.
*
* Returns: (transfer none): the user data for this deserializer
*/
gpointer
gdk_content_deserializer_get_user_data (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->user_data;
}
/**
* gdk_content_deserializer_set_task_data:
* @deserializer: a #GdkContentDeserializer
* @data: data to associate with this operation
* @notify: destroy notify for @data
*
* Associate data with the current deserialization operation.
*/
void
gdk_content_deserializer_set_task_data (GdkContentDeserializer *deserializer,
gpointer data,
GDestroyNotify notify)
{
g_return_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer));
if (deserializer->task_notify)
deserializer->task_notify (deserializer->task_data);
deserializer->task_data = data;
deserializer->task_notify = notify;
}
/**
* gdk_content_deserializer_get_task_data:
* @deserializer: a #GdkContentDeserializer
*
* Gets the data that was associated with @deserializer via gdk_content_deserializer_set_task_data().
*
* Returns: (transfer none): the task data for @deserializer
*/
gpointer
gdk_content_deserializer_get_task_data (GdkContentDeserializer *deserializer)
{
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer), NULL);
return deserializer->task_data;
}
static gboolean
gdk_content_deserializer_emit_callback (gpointer data)
{
GdkContentDeserializer *deserializer = data;
if (deserializer->callback)
{
deserializer->callback (NULL, G_ASYNC_RESULT (deserializer), deserializer->callback_data);
}
return G_SOURCE_REMOVE;
}
/**
* gdk_content_deserializer_return_success:
* @deserializer: a #GdkContentDeserializer
*
* Indicate that the deserialization has been successfully completed.
*/
void
gdk_content_deserializer_return_success (GdkContentDeserializer *deserializer)
{
g_return_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer));
g_return_if_fail (!deserializer->returned);
deserializer->returned = TRUE;
g_idle_add_full (deserializer->priority,
gdk_content_deserializer_emit_callback,
deserializer,
g_object_unref);
/* NB: the idle will destroy our reference */
}
/**
* gdk_content_deserializer_return_error:
* @deserializer: a #GdkContentDeserializer
* @error: a #GError
*
* Indicate that the deserialization has ended with an error.
* This function consumes @error.
*/
void
gdk_content_deserializer_return_error (GdkContentDeserializer *deserializer,
GError *error)
{
g_return_if_fail (GDK_IS_CONTENT_DESERIALIZER (deserializer));
g_return_if_fail (!deserializer->returned);
g_return_if_fail (error != NULL);
deserializer->error = error;
/* FIXME: naming */
gdk_content_deserializer_return_success (deserializer);
}
/**
* gdk_content_register_deserializer:
* @mime_type: the mime type which the function can deserialize from
* @type: the type of objects that the function creates
* @deserialize: the callback
* @data: data that @deserialize can access
* @notify: destroy notify for @data
*
* Registers a function to create objects of a given @type from
* a serialized representation with the given mime type.
*/
void
gdk_content_register_deserializer (const char *mime_type,
GType type,
GdkContentDeserializeFunc deserialize,
gpointer data,
GDestroyNotify notify)
{
Deserializer *deserializer;
g_return_if_fail (mime_type != NULL);
g_return_if_fail (deserialize != NULL);
init ();
deserializer = g_slice_new0 (Deserializer);
deserializer->mime_type = g_intern_string (mime_type);
deserializer->type = type;
deserializer->deserialize = deserialize;
deserializer->data = data;
deserializer->notify = notify;
g_queue_push_tail (&deserializers, deserializer);
}
static Deserializer *
lookup_deserializer (const char *mime_type,
GType type)
{
GList *l;
g_return_val_if_fail (mime_type != NULL, NULL);
init ();
mime_type = g_intern_string (mime_type);
for (l = g_queue_peek_head_link (&deserializers); l; l = l->next)
{
Deserializer *deserializer = l->data;
if (deserializer->mime_type == mime_type &&
deserializer->type == type)
return deserializer;
}
return NULL;
}
/**
* gdk_content_formats_union_deserialize_gtypes:
* @formats: a #GdkContentFormats
*
* Add GTypes for mime types in @formats for which deserializers are
* registered.
*
* Return: a new #GdkContentFormats
*/
GdkContentFormats *
gdk_content_formats_union_deserialize_gtypes (GdkContentFormats *formats)
{
GdkContentFormatsBuilder *builder;
GList *l;
g_return_val_if_fail (formats != NULL, NULL);
init ();
builder = gdk_content_formats_builder_new ();
gdk_content_formats_builder_add_formats (builder, formats);
for (l = g_queue_peek_head_link (&deserializers); l; l = l->next)
{
Deserializer *deserializer = l->data;
if (gdk_content_formats_contain_mime_type (formats, deserializer->mime_type))
gdk_content_formats_builder_add_gtype (builder, deserializer->type);
}
gdk_content_formats_unref (formats);
return gdk_content_formats_builder_free_to_formats (builder);
}
/**
* gdk_content_formats_union_deserialize_mime_types:
* @formats: a #GdkContentFormats
*
* Add mime types for GTypes in @formats for which deserializers are
* registered.
*
* Return: a new #GdkContentFormats
*/
GdkContentFormats *
gdk_content_formats_union_deserialize_mime_types (GdkContentFormats *formats)
{
GdkContentFormatsBuilder *builder;
GList *l;
g_return_val_if_fail (formats != NULL, NULL);
init ();
builder = gdk_content_formats_builder_new ();
gdk_content_formats_builder_add_formats (builder, formats);
for (l = g_queue_peek_head_link (&deserializers); l; l = l->next)
{
Deserializer *deserializer = l->data;
if (gdk_content_formats_contain_gtype (formats, deserializer->type))
gdk_content_formats_builder_add_mime_type (builder, deserializer->mime_type);
}
gdk_content_formats_unref (formats);
return gdk_content_formats_builder_free_to_formats (builder);
}
static void
deserialize_not_found (GdkContentDeserializer *deserializer)
{
GError *error = g_error_new (G_IO_ERROR,
G_IO_ERROR_NOT_FOUND,
"Could not convert data from %s to %s",
gdk_content_deserializer_get_mime_type (deserializer),
g_type_name (gdk_content_deserializer_get_gtype (deserializer)));
gdk_content_deserializer_return_error (deserializer, error);
}
/**
* gdk_content_deserialize_async:
* @stream: a #GInputStream to read the serialized content from
* @mime_type: the mime type to deserialize from
* @type: the GType to deserialize from
* @io_priority: the io priority of the operation
* @cancellable: (nullable): optional #GCancellable object
* @callback: (scope async): callback to call when the operation is done
* @user_data: (closure): data to pass to the callback function
*
* Read content from the given input stream and deserialize it, asynchronously.
* When the operation is finished, @callback will be called. You can then
* call gdk_content_deserialize_finish() to get the result of the operation.
*/
void
gdk_content_deserialize_async (GInputStream *stream,
const char *mime_type,
GType type,
int io_priority,
GCancellable *cancellable,
GAsyncReadyCallback callback,
gpointer user_data)
{
Deserializer *deserializer;
g_return_if_fail (G_IS_INPUT_STREAM (stream));
g_return_if_fail (cancellable == NULL || G_IS_CANCELLABLE (cancellable));
g_return_if_fail (callback != NULL);
deserializer = lookup_deserializer (mime_type, type);
gdk_content_deserializer_run (mime_type,
type,
stream,
io_priority,
cancellable,
deserializer ? deserializer->deserialize : deserialize_not_found,
deserializer ? deserializer->data : NULL,
callback,
user_data);
}
/**
* gdk_content_deserialize_finish:
* @result: the #GAsyncResult
* @value: return location for the result of the operation
* @error: return location for an error
*
* Finishes a content deserialization operation.
*
* Returns: %TRUE if the operation was successful. In this case, @value is set.
* %FALSE if an error occurred. In this case, @error is set
*/
gboolean
gdk_content_deserialize_finish (GAsyncResult *result,
GValue *value,
GError **error)
{
GdkContentDeserializer *deserializer;
g_return_val_if_fail (GDK_IS_CONTENT_DESERIALIZER (result), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
deserializer = GDK_CONTENT_DESERIALIZER (result);
g_return_val_if_fail (G_VALUE_HOLDS (value, G_VALUE_TYPE (&deserializer->value)), FALSE);
if (deserializer->error)
{
if (error)
*error = g_error_copy (deserializer->error);
return FALSE;
}
g_value_copy (&deserializer->value, value);
return TRUE;
}
/*** DESERIALIZERS ***/
static void
pixbuf_deserializer_finish (GObject *source,
GAsyncResult *res,
gpointer deserializer)
{
GdkPixbuf *pixbuf;
GValue *value;
GError *error = NULL;
pixbuf = gdk_pixbuf_new_from_stream_finish (res, &error);
if (pixbuf == NULL)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
value = gdk_content_deserializer_get_value (deserializer);
if (G_VALUE_HOLDS (value, GDK_TYPE_PIXBUF))
{
g_value_take_object (value, pixbuf);
}
else if (G_VALUE_HOLDS (value, GDK_TYPE_TEXTURE))
{
GdkTexture *texture;
texture = gdk_texture_new_for_pixbuf (pixbuf);
g_object_unref (pixbuf);
g_value_take_object (value, texture);
}
else
{
g_assert_not_reached ();
}
gdk_content_deserializer_return_success (deserializer);
}
static void
pixbuf_deserializer (GdkContentDeserializer *deserializer)
{
gdk_pixbuf_new_from_stream_async (gdk_content_deserializer_get_input_stream (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
pixbuf_deserializer_finish,
deserializer);
}
static void
string_deserializer_finish (GObject *source,
GAsyncResult *result,
gpointer deserializer)
{
GOutputStream *stream = G_OUTPUT_STREAM (source);
GError *error = NULL;
gssize written;
written = g_output_stream_splice_finish (stream, result, &error);
if (written < 0)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
else if (written == 0)
{
/* Never return NULL, we only return that on error */
g_value_set_string (gdk_content_deserializer_get_value (deserializer), "");
}
else
{
g_value_take_string (gdk_content_deserializer_get_value (deserializer),
g_memory_output_stream_steal_data (G_MEMORY_OUTPUT_STREAM (
g_filter_output_stream_get_base_stream (G_FILTER_OUTPUT_STREAM (stream)))));
}
gdk_content_deserializer_return_success (deserializer);
}
static void
string_deserializer (GdkContentDeserializer *deserializer)
{
GOutputStream *output, *filter;
GCharsetConverter *converter;
GError *error = NULL;
converter = g_charset_converter_new ("utf-8",
gdk_content_deserializer_get_user_data (deserializer),
&error);
if (converter == NULL)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
g_charset_converter_set_use_fallback (converter, TRUE);
output = g_memory_output_stream_new_resizable ();
filter = g_converter_output_stream_new (output, G_CONVERTER (converter));
g_object_unref (output);
g_object_unref (converter);
g_output_stream_splice_async (filter,
gdk_content_deserializer_get_input_stream (deserializer),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE | G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
gdk_content_deserializer_get_priority (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
string_deserializer_finish,
deserializer);
g_object_unref (filter);
}
static void
file_uri_deserializer_finish (GObject *source,
GAsyncResult *result,
gpointer deserializer)
{
GOutputStream *stream = G_OUTPUT_STREAM (source);
GError *error = NULL;
gssize written;
GValue *value;
char *str;
char **uris;
written = g_output_stream_splice_finish (stream, result, &error);
if (written < 0)
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
/* write terminating NULL */
if (!g_output_stream_write (stream, "", 1, NULL, &error))
{
gdk_content_deserializer_return_error (deserializer, error);
return;
}
str = g_memory_output_stream_steal_data (G_MEMORY_OUTPUT_STREAM (stream));
uris = g_uri_list_extract_uris (str);
g_free (str);
value = gdk_content_deserializer_get_value (deserializer);
if (G_VALUE_HOLDS (value, G_TYPE_FILE))
{
if (uris[0] != NULL)
g_value_take_object (value, g_file_new_for_uri (uris[0]));
}
else
{
GSList *l = NULL;
gsize i;
for (i = 0; uris[i] != NULL; i++)
l = g_slist_prepend (l, g_file_new_for_uri (uris[i]));
g_value_take_boxed (value, g_slist_reverse (l));
}
g_strfreev (uris);
gdk_content_deserializer_return_success (deserializer);
}
static void
file_uri_deserializer (GdkContentDeserializer *deserializer)
{
GOutputStream *output;
output = g_memory_output_stream_new_resizable ();
g_output_stream_splice_async (output,
gdk_content_deserializer_get_input_stream (deserializer),
G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE | G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET,
gdk_content_deserializer_get_priority (deserializer),
gdk_content_deserializer_get_cancellable (deserializer),
file_uri_deserializer_finish,
deserializer);
g_object_unref (output);
}
static void
init (void)
{
static gboolean initialized = FALSE;
GSList *formats, *f;
const char *charset;
if (initialized)
return;
initialized = TRUE;
formats = gdk_pixbuf_get_formats ();
/* Make sure png comes first */
for (f = formats; f; f = f->next)
{
GdkPixbufFormat *fmt = f->data;
gchar *name;
name = gdk_pixbuf_format_get_name (fmt);
if (g_str_equal (name, "png"))
{
formats = g_slist_delete_link (formats, f);
formats = g_slist_prepend (formats, fmt);
g_free (name);
break;
}
g_free (name);
}
for (f = formats; f; f = f->next)
{
GdkPixbufFormat *fmt = f->data;
gchar **mimes, **m;
mimes = gdk_pixbuf_format_get_mime_types (fmt);
for (m = mimes; *m; m++)
{
gdk_content_register_deserializer (*m,
GDK_TYPE_TEXTURE,
pixbuf_deserializer,
NULL,
NULL);
gdk_content_register_deserializer (*m,
GDK_TYPE_PIXBUF,
pixbuf_deserializer,
NULL,
NULL);
}
g_strfreev (mimes);
}
g_slist_free (formats);
gdk_content_register_deserializer ("text/uri-list",
GDK_TYPE_FILE_LIST,
file_uri_deserializer,
NULL,
NULL);
gdk_content_register_deserializer ("text/uri-list",
G_TYPE_FILE,
file_uri_deserializer,
NULL,
NULL);
gdk_content_register_deserializer ("text/plain;charset=utf-8",
G_TYPE_STRING,
string_deserializer,
(gpointer) "utf-8",
NULL);
if (!g_get_charset (&charset))
{
char *mime = g_strdup_printf ("text/plain;charset=%s", charset);
gdk_content_register_deserializer (mime,
G_TYPE_STRING,
string_deserializer,
mime,
g_free);
}
gdk_content_register_deserializer ("text/plain",
G_TYPE_STRING,
string_deserializer,
(gpointer) "ASCII",
NULL);
}