s4-dsdb: Add context structure for dsdb_syntax conversion functions

This structure is intended to hold context-dependent data.

Syntax-conversion and object-conversion functions need
that data to convert objects and attributes from drs-to-ldb
and ldb-to-drs correctly.

For instance: ATTID value depends on whether we are converting
object from partition different that Schema partition.

2 files changed, 19 insertions, 0 deletions

diff --git a/source4/dsdb/schema/schema.h b/source4/dsdb/schema/schema.h
index 34423be809..2168202d1f 100644
--- a/source4/dsdb/schema/schema.h
+++ b/source4/dsdb/schema/schema.h
@@ -28,6 +28,12 @@ struct dsdb_attribute;
 struct dsdb_class;
 struct dsdb_schema;
 
+struct dsdb_syntax_ctx {
+	struct ldb_context *ldb;
+	const struct dsdb_schema *schema;
+};
+
+
 struct dsdb_syntax {
 	const char *name;
 	const char *ldap_oid;
diff --git a/source4/dsdb/schema/schema_syntax.c b/source4/dsdb/schema/schema_syntax.c
index 193d62dfcc..a6593b4f78 100644
--- a/source4/dsdb/schema/schema_syntax.c
+++ b/source4/dsdb/schema/schema_syntax.c
@@ -31,6 +31,19 @@
 #include "../lib/util/charset/charset.h"
 #include "librpc/ndr/libndr.h"
 
+/**
+ * Initialize dsdb_syntax_ctx with default values
+ * for common cases.
+ */
+void dsdb_syntax_ctx_init(struct dsdb_syntax_ctx *ctx,
+			  struct ldb_context *ldb,
+			  const struct dsdb_schema *schema)
+{
+	ctx->ldb 	= ldb;
+	ctx->schema 	= schema;
+}
+
+
 static WERROR dsdb_syntax_FOOBAR_drsuapi_to_ldb(struct ldb_context *ldb, 
 						const struct dsdb_schema *schema,
 						const struct dsdb_attribute *attr,