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Bug 552371 – implement struct field get/set
Add convenience functions g_field_info_set_field() and g_field_info_get_field() to set and get fields based on the offsets in GIFieldInfo. svn path=/trunk/; revision=929
This commit is contained in:
Owen Taylor
parent
5a1f29d1c9
commit
c7ae662dbe
@ -12,6 +12,7 @@ libgirepository_la_SOURCES = \
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girepository.c \
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gtypelib.h \
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gtypelib.c \
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gfield.c \
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ginfo.c \
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girffi.c \
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girffi.h \
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308
gfield.c
Normal file
308
gfield.c
Normal file
@ -0,0 +1,308 @@
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#include "girepository.h"
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/**
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* g_field_info_get_field:
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* @field_info: a #GIFieldInfo
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* @mem: pointer to a block of memory representing a C structure or union
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* @value: a #GArgument into which to store the value retrieved
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*
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* Reads a field identified by a #GFieldInfo from a C structure or
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* union. This only handles fields of simple C types. It will fail
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* for a field of a composite type like a nested structure or union
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* even if that is actually readable.
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*
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* Returns: %TRUE if reading the field succeeded, otherwise %FALSE
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*/
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gboolean
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g_field_info_get_field (GIFieldInfo *field_info,
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gpointer mem,
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GArgument *value)
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{
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int offset;
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GITypeInfo *type_info;
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gboolean result = FALSE;
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if (!g_field_info_get_flags (field_info) & GI_FIELD_IS_READABLE)
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return FALSE;
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offset = g_field_info_get_offset (field_info);
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type_info = g_field_info_get_type (field_info);
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if (g_type_info_is_pointer (type_info))
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{
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value->v_pointer = G_STRUCT_MEMBER(gpointer, mem, offset);
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result = TRUE;
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}
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else
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{
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switch (g_type_info_get_tag (type_info))
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{
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case GI_TYPE_TAG_VOID:
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g_warning("Field %s: should not be have void type",
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g_base_info_get_name ((GIBaseInfo *)field_info));
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break;
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case GI_TYPE_TAG_BOOLEAN:
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value->v_boolean = G_STRUCT_MEMBER(gboolean, mem, offset) != FALSE;
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT8:
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case GI_TYPE_TAG_UINT8:
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value->v_uint8 = G_STRUCT_MEMBER(guint8, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT16:
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case GI_TYPE_TAG_UINT16:
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value->v_uint16 = G_STRUCT_MEMBER(guint16, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT32:
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case GI_TYPE_TAG_UINT32:
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case GI_TYPE_TAG_INT:
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case GI_TYPE_TAG_UINT:
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value->v_uint32 = G_STRUCT_MEMBER(guint32, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT64:
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case GI_TYPE_TAG_UINT64:
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value->v_uint64 = G_STRUCT_MEMBER(guint64, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_LONG:
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case GI_TYPE_TAG_ULONG:
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value->v_ulong = G_STRUCT_MEMBER(gulong, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_SSIZE:
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case GI_TYPE_TAG_SIZE:
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case GI_TYPE_TAG_GTYPE:
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value->v_size = G_STRUCT_MEMBER(gsize, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_FLOAT:
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value->v_float = G_STRUCT_MEMBER(gfloat, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_DOUBLE:
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value->v_double = G_STRUCT_MEMBER(gdouble, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_TIME_T:
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value->v_long = G_STRUCT_MEMBER(time_t, mem, offset);
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result = TRUE;
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break;
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case GI_TYPE_TAG_UTF8:
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case GI_TYPE_TAG_FILENAME:
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case GI_TYPE_TAG_ARRAY:
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case GI_TYPE_TAG_GLIST:
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case GI_TYPE_TAG_GSLIST:
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case GI_TYPE_TAG_GHASH:
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g_warning("Field %s: type %s should have is_pointer set",
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g_base_info_get_name ((GIBaseInfo *)field_info),
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g_type_tag_to_string (g_type_info_get_tag (type_info)));
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break;
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case GI_TYPE_TAG_ERROR:
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/* Needs to be handled by the language binding directly */
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break;
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case GI_TYPE_TAG_INTERFACE:
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{
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GIBaseInfo *interface = g_type_info_get_interface (type_info);
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switch (g_base_info_get_type (interface))
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{
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case GI_INFO_TYPE_STRUCT:
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case GI_INFO_TYPE_UNION:
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case GI_INFO_TYPE_BOXED:
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/* Needs to be handled by the language binding directly */
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break;
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case GI_INFO_TYPE_OBJECT:
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break;
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case GI_INFO_TYPE_ENUM:
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case GI_INFO_TYPE_FLAGS:
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/* Not yet implemented */
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break;
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case GI_INFO_TYPE_VFUNC:
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case GI_INFO_TYPE_CALLBACK:
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g_warning("Field%s: Interface type %d should have is_pointer set",
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g_base_info_get_name ((GIBaseInfo *)field_info),
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g_base_info_get_type (interface));
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break;
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case GI_INFO_TYPE_INVALID:
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case GI_INFO_TYPE_INTERFACE:
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case GI_INFO_TYPE_FUNCTION:
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case GI_INFO_TYPE_CONSTANT:
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case GI_INFO_TYPE_ERROR_DOMAIN:
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case GI_INFO_TYPE_VALUE:
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case GI_INFO_TYPE_SIGNAL:
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case GI_INFO_TYPE_PROPERTY:
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case GI_INFO_TYPE_FIELD:
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case GI_INFO_TYPE_ARG:
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case GI_INFO_TYPE_TYPE:
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case GI_INFO_TYPE_UNRESOLVED:
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g_warning("Field %s: Interface type %d not expected",
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g_base_info_get_name ((GIBaseInfo *)field_info),
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g_base_info_get_type (interface));
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break;
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}
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g_base_info_unref ((GIBaseInfo *)interface);
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break;
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}
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break;
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}
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}
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g_base_info_unref ((GIBaseInfo *)field_info);
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return result;
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}
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/**
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* g_field_info_set_field:
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* @field_info: a #GIFieldInfo
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* @mem: pointer to a block of memory representing a C structure or union
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* @value: a #GArgument holding the value to store
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*
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* Writes a field identified by a #GFieldInfo to a C structure or
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* union. This only handles fields of simple C types. It will fail
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* for a field of a composite type like a nested structure or union
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* even if that is actually writable. Note also that that it will refuse
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* to write fields where memory management would by required. A field
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* with a type such as 'char *' must be set with a setter function.
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*
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* Returns: %TRUE if reading the field succeeded, otherwise %FALSE
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*/
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gboolean
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g_field_info_set_field (GIFieldInfo *field_info,
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gpointer mem,
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const GArgument *value)
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{
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int offset;
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GITypeInfo *type_info;
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gboolean result = FALSE;
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if (!g_field_info_get_flags (field_info) & GI_FIELD_IS_WRITABLE)
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return FALSE;
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offset = g_field_info_get_offset (field_info);
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type_info = g_field_info_get_type (field_info);
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if (!g_type_info_is_pointer (type_info))
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{
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switch (g_type_info_get_tag (type_info))
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{
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case GI_TYPE_TAG_VOID:
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g_warning("Field %s: should not be have void type",
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g_base_info_get_name ((GIBaseInfo *)field_info));
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break;
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case GI_TYPE_TAG_BOOLEAN:
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G_STRUCT_MEMBER(gboolean, mem, offset) = value->v_boolean != FALSE;
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT8:
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case GI_TYPE_TAG_UINT8:
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G_STRUCT_MEMBER(guint8, mem, offset) = value->v_uint8;
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT16:
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case GI_TYPE_TAG_UINT16:
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G_STRUCT_MEMBER(guint16, mem, offset) = value->v_uint16;
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT32:
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case GI_TYPE_TAG_UINT32:
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case GI_TYPE_TAG_INT:
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case GI_TYPE_TAG_UINT:
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G_STRUCT_MEMBER(guint32, mem, offset) = value->v_uint32;
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result = TRUE;
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break;
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case GI_TYPE_TAG_INT64:
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case GI_TYPE_TAG_UINT64:
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G_STRUCT_MEMBER(guint64, mem, offset) = value->v_uint64;
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result = TRUE;
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break;
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case GI_TYPE_TAG_LONG:
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case GI_TYPE_TAG_ULONG:
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G_STRUCT_MEMBER(gulong, mem, offset)= value->v_ulong;
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result = TRUE;
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break;
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case GI_TYPE_TAG_SSIZE:
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case GI_TYPE_TAG_SIZE:
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case GI_TYPE_TAG_GTYPE:
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G_STRUCT_MEMBER(gsize, mem, offset) = value->v_size;
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result = TRUE;
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break;
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case GI_TYPE_TAG_FLOAT:
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G_STRUCT_MEMBER(gfloat, mem, offset) = value->v_float;
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result = TRUE;
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break;
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case GI_TYPE_TAG_DOUBLE:
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G_STRUCT_MEMBER(gdouble, mem, offset)= value->v_double;
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result = TRUE;
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break;
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case GI_TYPE_TAG_TIME_T:
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G_STRUCT_MEMBER(time_t, mem, offset) = value->v_long;
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result = TRUE;
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break;
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case GI_TYPE_TAG_UTF8:
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case GI_TYPE_TAG_FILENAME:
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case GI_TYPE_TAG_ARRAY:
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case GI_TYPE_TAG_GLIST:
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case GI_TYPE_TAG_GSLIST:
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case GI_TYPE_TAG_GHASH:
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g_warning("Field %s: type %s should have is_pointer set",
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g_base_info_get_name ((GIBaseInfo *)field_info),
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g_type_tag_to_string (g_type_info_get_tag (type_info)));
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break;
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case GI_TYPE_TAG_ERROR:
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/* Needs to be handled by the language binding directly */
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break;
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case GI_TYPE_TAG_INTERFACE:
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{
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GIBaseInfo *interface = g_type_info_get_interface (type_info);
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switch (g_base_info_get_type (interface))
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{
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case GI_INFO_TYPE_STRUCT:
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case GI_INFO_TYPE_UNION:
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case GI_INFO_TYPE_BOXED:
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/* Needs to be handled by the language binding directly */
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break;
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case GI_INFO_TYPE_OBJECT:
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break;
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case GI_INFO_TYPE_ENUM:
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case GI_INFO_TYPE_FLAGS:
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/* Not yet implemented */
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break;
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case GI_INFO_TYPE_VFUNC:
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case GI_INFO_TYPE_CALLBACK:
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g_warning("Field%s: Interface type %d should have is_pointer set",
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g_base_info_get_name ((GIBaseInfo *)field_info),
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g_base_info_get_type (interface));
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break;
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case GI_INFO_TYPE_INVALID:
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case GI_INFO_TYPE_INTERFACE:
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case GI_INFO_TYPE_FUNCTION:
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case GI_INFO_TYPE_CONSTANT:
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case GI_INFO_TYPE_ERROR_DOMAIN:
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case GI_INFO_TYPE_VALUE:
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case GI_INFO_TYPE_SIGNAL:
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case GI_INFO_TYPE_PROPERTY:
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case GI_INFO_TYPE_FIELD:
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case GI_INFO_TYPE_ARG:
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case GI_INFO_TYPE_TYPE:
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case GI_INFO_TYPE_UNRESOLVED:
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g_warning("Field %s: Interface type %d not expected",
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g_base_info_get_name ((GIBaseInfo *)field_info),
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g_base_info_get_type (interface));
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break;
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}
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g_base_info_unref ((GIBaseInfo *)interface);
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break;
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}
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break;
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}
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}
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g_base_info_unref ((GIBaseInfo *)field_info);
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return result;
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}
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@ -356,6 +356,12 @@ gint g_field_info_get_size (GIFieldInfo *info);
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gint g_field_info_get_offset (GIFieldInfo *info);
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GITypeInfo * g_field_info_get_type (GIFieldInfo *info);
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gboolean g_field_info_get_field (GIFieldInfo *field_info,
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gpointer mem,
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GArgument *value);
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gboolean g_field_info_set_field (GIFieldInfo *field_info,
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gpointer mem,
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const GArgument *value);
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/* GIUnionInfo */
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gint g_union_info_get_n_fields (GIUnionInfo *info);
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