[glib/wip/gvariant-kdbus: 5/9] GVariant: support serialising to GVariantVectors
- From: Ryan Lortie <desrt src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [glib/wip/gvariant-kdbus: 5/9] GVariant: support serialising to GVariantVectors
- Date: Tue, 2 Dec 2014 15:15:43 +0000 (UTC)
commit cd4009265e66dbf0248f473287234b616e8e30cc
Author: Ryan Lortie <desrt desrt ca>
Date: Fri Nov 28 17:57:30 2014 -0500
GVariant: support serialising to GVariantVectors
Add code for serialising GVariant to GVariantVectors.
Export that internally via the glib-private machanism so that we can use
it from GDBus.
glib/glib-private.c | 4 +-
glib/glib-private.h | 7 ++
glib/gvariant-core.c | 56 +++++++++++++
glib/gvariant-serialiser.c | 192 ++++++++++++++++++++++++++++++++++++++++++++
glib/gvariant-serialiser.h | 11 +++
5 files changed, 269 insertions(+), 1 deletions(-)
---
diff --git a/glib/glib-private.c b/glib/glib-private.c
index bbf879f..3c1dac6 100644
--- a/glib/glib-private.c
+++ b/glib/glib-private.c
@@ -44,7 +44,9 @@ glib__private__ (void)
g_main_context_new_with_next_id,
g_dir_open_with_errno,
- g_dir_new_from_dirp
+ g_dir_new_from_dirp,
+
+ g_variant_to_vectors
};
return &table;
diff --git a/glib/glib-private.h b/glib/glib-private.h
index 0a28008..40509b6 100644
--- a/glib/glib-private.h
+++ b/glib/glib-private.h
@@ -20,6 +20,7 @@
#include <glib.h>
#include "gwakeup.h"
+#include "gvariant-vectors.h"
#if defined(__GNUC__)
# define _g_alignof(type) (__alignof__ (type))
@@ -30,6 +31,8 @@
GMainContext * g_get_worker_context (void);
gboolean g_check_setuid (void);
GMainContext * g_main_context_new_with_next_id (guint next_id);
+void g_variant_to_vectors (GVariant *value,
+ GVariantVectors *vectors);
#ifdef G_OS_WIN32
gchar *_glib_get_dll_directory (void);
@@ -61,6 +64,10 @@ typedef struct {
guint flags);
GDir * (* g_dir_new_from_dirp) (gpointer dirp);
+ void (* g_variant_to_vectors) (GVariant *value,
+ GVariantVectors *vectors);
+
+
/* Add other private functions here, initialize them in glib-private.c */
} GLibPrivateVTable;
diff --git a/glib/gvariant-core.c b/glib/gvariant-core.c
index 4ab4238..45b876b 100644
--- a/glib/gvariant-core.c
+++ b/glib/gvariant-core.c
@@ -19,6 +19,7 @@
#include "config.h"
#include <glib/gvariant-core.h>
+#include "glib-private.h"
#include <glib/gvariant-serialiser.h>
#include <glib/gtestutils.h>
@@ -424,6 +425,61 @@ g_variant_ensure_serialised (GVariant *value)
}
}
+/* Now we have the code to recursively serialise a GVariant into a
+ * GVariantVectors structure.
+ *
+ * We want to do this in cases where the GVariant contains large chunks
+ * of serialised data in order to avoid having to copy this data.
+ *
+ * This generally works the same as normal serialising (co-recursion
+ * with the serialiser) but instead of using a callback we just hard-code
+ * the callback with the name g_variant_callback_write_to_vectors().
+ *
+ * This is a private API that will be used by GDBus.
+ */
+gsize
+g_variant_callback_write_to_vectors (GVariantVectors *vectors,
+ gpointer data,
+ GVariantTypeInfo **type_info)
+{
+ GVariant *value = data;
+
+ if (g_variant_lock_in_tree_form (value))
+ {
+ g_variant_serialiser_write_to_vectors (vectors, value->type_info, value->size,
+ (gpointer *) value->contents.tree.children,
+ value->contents.tree.n_children);
+
+ g_variant_unlock (value);
+ }
+ else
+ g_variant_vectors_append_gbytes (vectors, value->contents.serialised.bytes,
+ value->contents.serialised.data, value->size);
+
+ if (type_info)
+ *type_info = value->type_info;
+
+ return value->size;
+}
+
+/* < private >
+ * g_variant_serialise_to_vectors:
+ * @value: a #GVariant
+ * @vectors: (out): the result
+ *
+ * Serialises @value into @vectors.
+ *
+ * The caller must free @vectors.
+ */
+void
+g_variant_to_vectors (GVariant *value,
+ GVariantVectors *vectors)
+{
+ g_variant_vectors_init (vectors);
+
+ g_variant_callback_write_to_vectors (vectors, value, NULL);
+}
+
/* < private >
* g_variant_alloc:
* @type: the type of the new instance
diff --git a/glib/gvariant-serialiser.c b/glib/gvariant-serialiser.c
index 5df7fc3..c25a7be 100644
--- a/glib/gvariant-serialiser.c
+++ b/glib/gvariant-serialiser.c
@@ -292,6 +292,19 @@ gvs_fixed_sized_maybe_serialise (GVariantSerialised value,
}
}
+static gsize
+gvs_fixed_sized_maybe_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ if (!n_children)
+ return 0;
+
+ return g_variant_callback_write_to_vectors (vectors, children[0], NULL);
+}
+
static gboolean
gvs_fixed_sized_maybe_is_normal (GVariantSerialised value)
{
@@ -384,6 +397,20 @@ gvs_variable_sized_maybe_serialise (GVariantSerialised value,
}
}
+static void
+gvs_variable_sized_maybe_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ if (n_children)
+ {
+ g_variant_callback_write_to_vectors (vectors, children[0], NULL);
+ g_variant_vectors_append_copy (vectors, "", 1);
+ }
+}
+
static gboolean
gvs_variable_sized_maybe_is_normal (GVariantSerialised value)
{
@@ -482,6 +509,19 @@ gvs_fixed_sized_array_serialise (GVariantSerialised value,
}
}
+static void
+gvs_fixed_sized_array_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ gsize i;
+
+ for (i = 0; i < n_children; i++)
+ g_variant_callback_write_to_vectors (vectors, children[i], NULL);
+}
+
static gboolean
gvs_fixed_sized_array_is_normal (GVariantSerialised value)
{
@@ -747,6 +787,38 @@ gvs_variable_sized_array_serialise (GVariantSerialised value,
}
}
+static void
+gvs_variable_sized_array_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ guint offset_key;
+ guint alignment;
+ gsize offset;
+ gsize i;
+
+ if (n_children == 0)
+ return;
+
+ offset_key = g_variant_vectors_reserve_offsets (vectors, n_children, gvs_get_offset_size (size));
+ g_variant_type_info_query (type_info, &alignment, NULL);
+ offset = 0;
+
+ for (i = 0; i < n_children; i++)
+ {
+ if ((-offset) & alignment)
+ offset += g_variant_vectors_append_pad (vectors, (-offset) & alignment);
+
+ offset += g_variant_callback_write_to_vectors (vectors, children[i], NULL);
+
+ g_variant_vectors_write_to_offsets (vectors, i, offset, offset_key);
+ }
+
+ g_variant_vectors_commit_offsets (vectors, offset_key);
+}
+
static gboolean
gvs_variable_sized_array_is_normal (GVariantSerialised value)
{
@@ -1014,6 +1086,95 @@ gvs_tuple_serialise (GVariantSerialised value,
value.data[offset++] = '\0';
}
+
+static void
+gvs_tuple_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ const GVariantMemberInfo *member_info = NULL;
+ gsize fixed_size;
+ gsize offset;
+ gsize i;
+
+ if (n_children == 0)
+ {
+ g_variant_vectors_append_copy (vectors, "", 1);
+ return;
+ }
+
+ g_variant_type_info_query (type_info, NULL, &fixed_size);
+ offset = 0;
+
+ if (!fixed_size)
+ {
+ gsize n_offsets;
+
+ member_info = g_variant_type_info_member_info (type_info, n_children - 1);
+ n_offsets = member_info->i + 1;
+
+ if (n_offsets)
+ {
+ gsize offset_key = 0;
+
+ offset_key = g_variant_vectors_reserve_offsets (vectors, n_offsets, gvs_get_offset_size (size));
+
+ for (i = 0; i < n_children; i++)
+ {
+ guint alignment;
+
+ member_info = g_variant_type_info_member_info (type_info, i);
+ g_variant_type_info_query (member_info->type_info, &alignment, NULL);
+
+ if ((-offset) & alignment)
+ offset += g_variant_vectors_append_pad (vectors, (-offset) & alignment);
+
+ offset += g_variant_callback_write_to_vectors (vectors, children[i], NULL);
+
+ if (member_info->ending_type == G_VARIANT_MEMBER_ENDING_OFFSET)
+ g_variant_vectors_write_to_offsets (vectors, --n_offsets, offset, offset_key);
+ }
+
+ g_variant_vectors_commit_offsets (vectors, offset_key);
+ }
+ else
+ {
+ for (i = 0; i < n_children; i++)
+ {
+ guint alignment;
+
+ member_info = g_variant_type_info_member_info (type_info, i);
+ g_variant_type_info_query (member_info->type_info, &alignment, NULL);
+
+ if ((-offset) & alignment)
+ offset += g_variant_vectors_append_pad (vectors, (-offset) & alignment);
+
+ offset += g_variant_callback_write_to_vectors (vectors, children[i], NULL);
+ }
+ }
+ }
+ else
+ {
+ for (i = 0; i < n_children; i++)
+ {
+ guint alignment;
+
+ member_info = g_variant_type_info_member_info (type_info, i);
+ g_variant_type_info_query (member_info->type_info, &alignment, NULL);
+
+ if ((-offset) & alignment)
+ offset += g_variant_vectors_append_pad (vectors, (-offset) & alignment);
+
+ offset += g_variant_callback_write_to_vectors (vectors, children[i], NULL);
+ }
+
+ g_assert (fixed_size - offset < 8);
+ g_variant_vectors_append_pad (vectors, fixed_size - offset);
+ }
+}
+
static gboolean
gvs_tuple_is_normal (GVariantSerialised value)
{
@@ -1226,6 +1387,23 @@ gvs_variant_serialise (GVariantSerialised value,
memcpy (value.data + child.size + 1, type_string, strlen (type_string));
}
+static void
+gvs_variant_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ GVariantTypeInfo *child_type_info;
+ const gchar *type_string;
+
+ g_variant_callback_write_to_vectors (vectors, children[0], &child_type_info);
+ type_string = g_variant_type_info_get_type_string (child_type_info);
+
+ g_variant_vectors_append_copy (vectors, "", 1);
+ g_variant_vectors_append_copy (vectors, type_string, strlen (type_string));
+}
+
static inline gboolean
gvs_variant_is_normal (GVariantSerialised value)
{
@@ -1435,7 +1613,21 @@ g_variant_serialiser_needed_size (GVariantTypeInfo *type_info,
return gvs_/**/,/**/_needed_size (type_info, gvs_filler,
children, n_children);
+ )
+ g_assert_not_reached ();
+}
+
+void
+g_variant_serialiser_write_to_vectors (GVariantVectors *vectors,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize n_children)
+{
+ DISPATCH_CASES (type_info,
+ gvs_/**/,/**/_write_to_vectors (vectors, type_info, size, children, n_children);
+ return;
)
g_assert_not_reached ();
}
diff --git a/glib/gvariant-serialiser.h b/glib/gvariant-serialiser.h
index 2be3299..a558da0 100644
--- a/glib/gvariant-serialiser.h
+++ b/glib/gvariant-serialiser.h
@@ -22,6 +22,7 @@
#define __G_VARIANT_SERIALISER_H__
#include "gvarianttypeinfo.h"
+#include "gvariant-vectors.h"
typedef struct
{
@@ -70,4 +71,14 @@ GLIB_AVAILABLE_IN_ALL
gboolean g_variant_serialiser_is_signature (gconstpointer data,
gsize size);
+
+gsize g_variant_callback_write_to_vectors (GVariantVectors *vectors,
+ gpointer data,
+ GVariantTypeInfo
**type_info);
+void g_variant_serialiser_write_to_vectors (GVariantVectors *items,
+ GVariantTypeInfo *type_info,
+ gsize size,
+ const gpointer *children,
+ gsize
n_children);
+
#endif /* __G_VARIANT_SERIALISER_H__ */
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