X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=lib%2Fofpbuf.h;h=442c90c9134f1224625bbeed7a7aa58ccdc4feef;hb=9b45d7f5d;hp=bd668c1e3f08f8030f810a3ee88260d8da607feb;hpb=78090f6300df053914954794301e44a2df1f6d57;p=sliver-openvswitch.git

diff --git a/lib/ofpbuf.h b/lib/ofpbuf.h
index bd668c1e3..442c90c91 100644
--- a/lib/ofpbuf.h
+++ b/lib/ofpbuf.h
@@ -18,17 +18,26 @@
 #define OFPBUF_H 1
 
 #include <stddef.h>
+#include <stdint.h>
 #include "list.h"
+#include "util.h"
 
 #ifdef  __cplusplus
 extern "C" {
 #endif
 
+enum ofpbuf_source {
+    OFPBUF_MALLOC,              /* Obtained via malloc(). */
+    OFPBUF_STACK,               /* Stack space or static buffer. */
+    OFPBUF_CONST                /* Must not be expanded. */
+};
+
 /* Buffer for holding arbitrary data.  An ofpbuf is automatically reallocated
  * as necessary if it grows too large for the available memory. */
 struct ofpbuf {
-    void *base;                 /* First byte of area malloc()'d area. */
+    void *base;                 /* First byte of allocated space. */
     size_t allocated;           /* Number of bytes allocated. */
+    enum ofpbuf_source source;  /* Source of memory allocated as 'base'. */
 
     void *data;                 /* First byte actually in use. */
     size_t size;                /* Number of bytes in use. */
@@ -42,7 +51,12 @@ struct ofpbuf {
     void *private_p;            /* Private pointer for use by owner. */
 };
 
+/* Declares NAME as a SIZE-byte array aligned properly for storing any kind of
+ * data.  For use with ofpbuf_use_stack(). */
+#define OFPBUF_STACK_BUFFER(NAME, SIZE) uint64_t NAME[DIV_ROUND_UP(SIZE, 8)]
+
 void ofpbuf_use(struct ofpbuf *, void *, size_t);
+void ofpbuf_use_stack(struct ofpbuf *, void *, size_t);
 void ofpbuf_use_const(struct ofpbuf *, const void *, size_t);
 
 void ofpbuf_init(struct ofpbuf *, size_t);
@@ -55,6 +69,8 @@ struct ofpbuf *ofpbuf_clone(const struct ofpbuf *);
 struct ofpbuf *ofpbuf_clone_with_headroom(const struct ofpbuf *,
                                           size_t headroom);
 struct ofpbuf *ofpbuf_clone_data(const void *, size_t);
+struct ofpbuf *ofpbuf_clone_data_with_headroom(const void *, size_t,
+                                               size_t headroom);
 void ofpbuf_delete(struct ofpbuf *);
 
 void *ofpbuf_at(const struct ofpbuf *, size_t offset, size_t size);