Merge branch 'master' of git+ssh://metalzone.distorted.org.uk/~mdw/public-git/catacomb/

[u/mdw/catacomb] / gfshare.h

diff --git a/gfshare.h b/gfshare.h
index a53d137..87c71a6 100644 (file)
--- a/gfshare.h
+++ b/gfshare.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: gfshare.h,v 1.7 2004/04/08 01:36:15 mdw Exp $
+ * $Id$
  *
  * Secret sharing over %$\gf{2^8}$%
  *
@@ -72,6 +72,8 @@ typedef struct gfshare {
 
 #define GFSHARE_INIT(t, sz) { t, 0, sz, 0 }
 
+#define GFSHARE_INDEX(s, i) ((s)->v[(i) * ((s)->sz + 1)])
+
 /*----- Functions provided ------------------------------------------------*/
 
 /* --- @gfshare_create@ --- *
@@ -133,6 +135,17 @@ extern void gfshare_mkshares(gfshare */*s*/, grand */*r*/,
 
 extern void gfshare_get(gfshare */*s*/, unsigned /*x*/, void */*buf*/);
 
+/* --- @gfshare_addedp@ --- *
+ *
+ * Arguments:  @gfshare *s@ = pointer to sharing context
+ *             @unsigned x@ = which share number to check
+ *
+ * Returns:    Nonzero if share @x@ has been added already, zero if it
+ *             hasn't.
+ */
+
+extern int gfshare_addedp(gfshare */*s*/, unsigned /*x*/);
+
 /* --- @gfshare_add@ --- *
  *
  * Arguments:  @gfshare *s@ = pointer to sharing context