[MINOR] stick_table: provide functions to return stksess data from a type

This function does the indirection job in the table to find the pointer
to the real data matching the requested type.

include/proto/stick_table.h

@@ -25,6 +25,9 @@
 
 #include <types/stick_table.h>
 
+#define stktable_data_size(type) (sizeof(((union stktable_data*)0)->type))
+#define stktable_data_cast(ptr, type) ((union stktable_data*)(ptr))->type
+
 struct stksess *stksess_new(struct stktable *t, struct stktable_key *key);
 void stksess_setkey(struct stktable *t, struct stksess *ts, struct stktable_key *key);
 void stksess_free(struct stktable *t, struct stksess *ts);
@@ -57,4 +60,21 @@ static inline int stktable_alloc_data_type(struct stktable *t, int type)
 	return 1;
 }
 
+/* return pointer for data type <type> in sticky session <ts> of table <t>, or
+ * NULL if either <ts> is NULL or the type is not stored.
+ */
+static inline void *stktable_data_ptr(struct stktable *t, struct stksess *ts, int type)
+{
+	if (type >= STKTABLE_DATA_TYPES)
+		return NULL;
+
+	if (!t->data_ofs[type]) /* type not stored */
+		return NULL;
+
+	if (!ts)
+		return NULL;
+
+	return (void *)ts + t->data_ofs[type];
+}
+
 #endif /* _PROTO_STICK_TABLE_H */

include/types/stick_table.h

@@ -50,9 +50,6 @@ union stktable_data {
 	unsigned int conn_cum;
 };
 
-#define stktable_data_size(type) (sizeof(((union stktable_data*)0)->type))
-#define stktable_data_cast(ptr, type) ((union stktable_data*)(ptr))->type
-
 /* known data types */
 struct stktable_data_type {
 	const char *name; /* name of the data type */

src/stick_table.c

@@ -22,11 +22,10 @@
 #include <ebmbtree.h>
 #include <ebsttree.h>
 
-#include <types/stick_table.h>
-
 #include <proto/pattern.h>
 #include <proto/proxy.h>
 #include <proto/session.h>
+#include <proto/stick_table.h>
 #include <proto/task.h>