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glib/gfield.c

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C
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#include <string.h>
#include "girepository.h"
#include "girffi.h"
#include "config.h"
/**
* g_field_info_get_field:
* @field_info: a #GIFieldInfo
* @mem: pointer to a block of memory representing a C structure or union
* @value: a #GArgument into which to store the value retrieved
*
* Reads a field identified by a #GFieldInfo from a C structure or
* union. This only handles fields of simple C types. It will fail
* for a field of a composite type like a nested structure or union
* even if that is actually readable.
*
* Returns: %TRUE if reading the field succeeded, otherwise %FALSE
*/
gboolean
g_field_info_get_field (GIFieldInfo *field_info,
gpointer mem,
GArgument *value)
{
int offset;
GITypeInfo *type_info;
gboolean result = FALSE;
if ((g_field_info_get_flags (field_info) & GI_FIELD_IS_READABLE) == 0)
return FALSE;
offset = g_field_info_get_offset (field_info);
type_info = g_field_info_get_type (field_info);
if (g_type_info_is_pointer (type_info))
{
value->v_pointer = G_STRUCT_MEMBER(gpointer, mem, offset);
result = TRUE;
}
else
{
switch (g_type_info_get_tag (type_info))
{
case GI_TYPE_TAG_VOID:
g_warning("Field %s: should not be have void type",
g_base_info_get_name ((GIBaseInfo *)field_info));
break;
case GI_TYPE_TAG_BOOLEAN:
value->v_boolean = G_STRUCT_MEMBER(gboolean, mem, offset) != FALSE;
result = TRUE;
break;
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
value->v_uint8 = G_STRUCT_MEMBER(guint8, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
case GI_TYPE_TAG_SHORT:
case GI_TYPE_TAG_USHORT:
value->v_uint16 = G_STRUCT_MEMBER(guint16, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_INT:
case GI_TYPE_TAG_UINT:
value->v_uint32 = G_STRUCT_MEMBER(guint32, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
value->v_uint64 = G_STRUCT_MEMBER(guint64, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_LONG:
case GI_TYPE_TAG_ULONG:
value->v_ulong = G_STRUCT_MEMBER(gulong, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_SSIZE:
case GI_TYPE_TAG_SIZE:
case GI_TYPE_TAG_GTYPE:
value->v_size = G_STRUCT_MEMBER(gsize, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_FLOAT:
value->v_float = G_STRUCT_MEMBER(gfloat, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_DOUBLE:
value->v_double = G_STRUCT_MEMBER(gdouble, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_TIME_T:
#if SIZEOF_TIME_T == 4
value->v_int32 = G_STRUCT_MEMBER(time_t, mem, offset);
#elif SIZEOF_TIME_T == 8
value->v_int64 = G_STRUCT_MEMBER(time_t, mem, offset);
#else
# error "Unexpected size for time_t: not 4 or 8"
#endif
result = TRUE;
break;
case GI_TYPE_TAG_UTF8:
case GI_TYPE_TAG_FILENAME:
case GI_TYPE_TAG_ARRAY:
case GI_TYPE_TAG_GLIST:
case GI_TYPE_TAG_GSLIST:
case GI_TYPE_TAG_GHASH:
g_warning("Field %s: type %s should have is_pointer set",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_type_tag_to_string (g_type_info_get_tag (type_info)));
break;
case GI_TYPE_TAG_ERROR:
/* Needs to be handled by the language binding directly */
break;
case GI_TYPE_TAG_INTERFACE:
{
GIBaseInfo *interface = g_type_info_get_interface (type_info);
switch (g_base_info_get_type (interface))
{
case GI_INFO_TYPE_STRUCT:
case GI_INFO_TYPE_UNION:
case GI_INFO_TYPE_BOXED:
/* Needs to be handled by the language binding directly */
break;
case GI_INFO_TYPE_OBJECT:
break;
case GI_INFO_TYPE_ENUM:
case GI_INFO_TYPE_FLAGS:
{
/* FIXME: there's a mismatch here between the value->v_int we use
* here and the glong result returned from g_value_info_get_value().
* But to switch this to glong, we'd have to make g_function_info_invoke()
* translate value->v_long to the proper ABI for an enum function
* call parameter, which will usually be int, and then fix up language
* bindings.
*/
GITypeTag storage_type = g_enum_info_get_storage_type ((GIEnumInfo *)interface);
switch (storage_type)
{
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
value->v_int = (gint)G_STRUCT_MEMBER(guint8, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
case GI_TYPE_TAG_SHORT:
case GI_TYPE_TAG_USHORT:
value->v_int = (gint)G_STRUCT_MEMBER(guint16, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_INT:
case GI_TYPE_TAG_UINT:
value->v_int = (gint)G_STRUCT_MEMBER(guint32, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
value->v_int = (gint)G_STRUCT_MEMBER(guint64, mem, offset);
result = TRUE;
break;
case GI_TYPE_TAG_LONG:
case GI_TYPE_TAG_ULONG:
value->v_int = (gint)G_STRUCT_MEMBER(gulong, mem, offset);
result = TRUE;
break;
default:
g_warning("Field %s: Unexpected enum storage type %s",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_type_tag_to_string (storage_type));
break;
}
break;
}
case GI_INFO_TYPE_VFUNC:
case GI_INFO_TYPE_CALLBACK:
g_warning("Field %s: Interface type %d should have is_pointer set",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_base_info_get_type (interface));
break;
case GI_INFO_TYPE_INVALID:
case GI_INFO_TYPE_INTERFACE:
case GI_INFO_TYPE_FUNCTION:
case GI_INFO_TYPE_CONSTANT:
case GI_INFO_TYPE_ERROR_DOMAIN:
case GI_INFO_TYPE_VALUE:
case GI_INFO_TYPE_SIGNAL:
case GI_INFO_TYPE_PROPERTY:
case GI_INFO_TYPE_FIELD:
case GI_INFO_TYPE_ARG:
case GI_INFO_TYPE_TYPE:
case GI_INFO_TYPE_UNRESOLVED:
g_warning("Field %s: Interface type %d not expected",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_base_info_get_type (interface));
break;
}
g_base_info_unref ((GIBaseInfo *)interface);
break;
}
break;
}
}
g_base_info_unref ((GIBaseInfo *)type_info);
return result;
}
/**
* g_field_info_set_field:
* @field_info: a #GIFieldInfo
* @mem: pointer to a block of memory representing a C structure or union
* @value: a #GArgument holding the value to store
*
* Writes a field identified by a #GFieldInfo to a C structure or
* union. This only handles fields of simple C types. It will fail
* for a field of a composite type like a nested structure or union
* even if that is actually writable. Note also that that it will refuse
* to write fields where memory management would by required. A field
* with a type such as 'char *' must be set with a setter function.
*
* Returns: %TRUE if writing the field succeeded, otherwise %FALSE
*/
gboolean
g_field_info_set_field (GIFieldInfo *field_info,
gpointer mem,
const GArgument *value)
{
int offset;
GITypeInfo *type_info;
gboolean result = FALSE;
if ((g_field_info_get_flags (field_info) & GI_FIELD_IS_WRITABLE) == 0)
return FALSE;
offset = g_field_info_get_offset (field_info);
type_info = g_field_info_get_type (field_info);
if (!g_type_info_is_pointer (type_info))
{
switch (g_type_info_get_tag (type_info))
{
case GI_TYPE_TAG_VOID:
g_warning("Field %s: should not be have void type",
g_base_info_get_name ((GIBaseInfo *)field_info));
break;
case GI_TYPE_TAG_BOOLEAN:
G_STRUCT_MEMBER(gboolean, mem, offset) = value->v_boolean != FALSE;
result = TRUE;
break;
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
G_STRUCT_MEMBER(guint8, mem, offset) = value->v_uint8;
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
case GI_TYPE_TAG_SHORT:
case GI_TYPE_TAG_USHORT:
G_STRUCT_MEMBER(guint16, mem, offset) = value->v_uint16;
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_INT:
case GI_TYPE_TAG_UINT:
G_STRUCT_MEMBER(guint32, mem, offset) = value->v_uint32;
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
G_STRUCT_MEMBER(guint64, mem, offset) = value->v_uint64;
result = TRUE;
break;
case GI_TYPE_TAG_LONG:
case GI_TYPE_TAG_ULONG:
G_STRUCT_MEMBER(gulong, mem, offset)= value->v_ulong;
result = TRUE;
break;
case GI_TYPE_TAG_SSIZE:
case GI_TYPE_TAG_SIZE:
case GI_TYPE_TAG_GTYPE:
G_STRUCT_MEMBER(gsize, mem, offset) = value->v_size;
result = TRUE;
break;
case GI_TYPE_TAG_FLOAT:
G_STRUCT_MEMBER(gfloat, mem, offset) = value->v_float;
result = TRUE;
break;
case GI_TYPE_TAG_DOUBLE:
G_STRUCT_MEMBER(gdouble, mem, offset)= value->v_double;
result = TRUE;
break;
case GI_TYPE_TAG_TIME_T:
#if SIZEOF_TIME_T == 4
G_STRUCT_MEMBER(time_t, mem, offset) = value->v_int32;
#elif SIZEOF_TIME_T == 8
G_STRUCT_MEMBER(time_t, mem, offset) = value->v_int64;
#else
# error "Unexpected size for time_t: not 4 or 8"
#endif
result = TRUE;
break;
case GI_TYPE_TAG_UTF8:
case GI_TYPE_TAG_FILENAME:
case GI_TYPE_TAG_ARRAY:
case GI_TYPE_TAG_GLIST:
case GI_TYPE_TAG_GSLIST:
case GI_TYPE_TAG_GHASH:
g_warning("Field %s: type %s should have is_pointer set",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_type_tag_to_string (g_type_info_get_tag (type_info)));
break;
case GI_TYPE_TAG_ERROR:
/* Needs to be handled by the language binding directly */
break;
case GI_TYPE_TAG_INTERFACE:
{
GIBaseInfo *interface = g_type_info_get_interface (type_info);
switch (g_base_info_get_type (interface))
{
case GI_INFO_TYPE_STRUCT:
case GI_INFO_TYPE_UNION:
case GI_INFO_TYPE_BOXED:
/* Needs to be handled by the language binding directly */
break;
case GI_INFO_TYPE_OBJECT:
break;
case GI_INFO_TYPE_ENUM:
case GI_INFO_TYPE_FLAGS:
{
/* See FIXME above
*/
GITypeTag storage_type = g_enum_info_get_storage_type ((GIEnumInfo *)interface);
switch (storage_type)
{
case GI_TYPE_TAG_INT8:
case GI_TYPE_TAG_UINT8:
G_STRUCT_MEMBER(guint8, mem, offset) = (guint8)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_INT16:
case GI_TYPE_TAG_UINT16:
case GI_TYPE_TAG_SHORT:
case GI_TYPE_TAG_USHORT:
G_STRUCT_MEMBER(guint16, mem, offset) = (guint16)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_INT32:
case GI_TYPE_TAG_UINT32:
case GI_TYPE_TAG_INT:
case GI_TYPE_TAG_UINT:
G_STRUCT_MEMBER(guint32, mem, offset) = (guint32)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_INT64:
case GI_TYPE_TAG_UINT64:
G_STRUCT_MEMBER(guint64, mem, offset) = (guint64)value->v_int;
result = TRUE;
break;
case GI_TYPE_TAG_LONG:
case GI_TYPE_TAG_ULONG:
G_STRUCT_MEMBER(gulong, mem, offset) = (gulong)value->v_int;
result = TRUE;
break;
default:
g_warning("Field %s: Unexpected enum storage type %s",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_type_tag_to_string (storage_type));
break;
}
break;
}
break;
case GI_INFO_TYPE_VFUNC:
case GI_INFO_TYPE_CALLBACK:
g_warning("Field%s: Interface type %d should have is_pointer set",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_base_info_get_type (interface));
break;
case GI_INFO_TYPE_INVALID:
case GI_INFO_TYPE_INTERFACE:
case GI_INFO_TYPE_FUNCTION:
case GI_INFO_TYPE_CONSTANT:
case GI_INFO_TYPE_ERROR_DOMAIN:
case GI_INFO_TYPE_VALUE:
case GI_INFO_TYPE_SIGNAL:
case GI_INFO_TYPE_PROPERTY:
case GI_INFO_TYPE_FIELD:
case GI_INFO_TYPE_ARG:
case GI_INFO_TYPE_TYPE:
case GI_INFO_TYPE_UNRESOLVED:
g_warning("Field %s: Interface type %d not expected",
g_base_info_get_name ((GIBaseInfo *)field_info),
g_base_info_get_type (interface));
break;
}
g_base_info_unref ((GIBaseInfo *)interface);
break;
}
break;
}
}
g_base_info_unref ((GIBaseInfo *)type_info);
return result;
}
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