X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/mLib/blobdiff_plain/db2bf4111cde36048ac66bbac58547d105bc7e80..67b5031ec6d160b5cae425466a34d1be3b211dd4:/codec/baseconv.c?ds=sidebyside

diff --git a/codec/baseconv.c b/codec/baseconv.c
index b7cb0a0..53fceb2 100644
--- a/codec/baseconv.c
+++ b/codec/baseconv.c
@@ -364,8 +364,8 @@ static int ctxn##_dodecode(ctxn##_ctx *ctx,				\
 	case PC:							\
 	  if (f & CDCF_IGNEQMID) break;					\
 	  if (f & CDCF_NOEQPAD) goto badch;				\
-	  if (st == ST_MAIN &&						\
-	      !(f & CDCF_IGNZPAD) && (a & ((1 << nb) - 1)))		\
+	  if (st == ST_MAIN && !(f & CDCF_IGNZPAD) &&			\
+	      ((nb && !(nb%wd)) || (a & ((1 << nb) - 1))))		\
 	    return (CDCERR_INVZPAD);					\
 	  st = ST_PAD;							\
 	  if (!(f & CDCF_IGNEQPAD)) {					\
@@ -387,8 +387,8 @@ static int ctxn##_dodecode(ctxn##_ctx *ctx,				\
       }									\
     }									\
   } else {								\
-    if (st == ST_MAIN &&						\
-	!(f & CDCF_IGNZPAD) && (a & ((1 << nb) - 1)))			\
+    if (st == ST_MAIN && !(f & CDCF_IGNZPAD) &&				\
+	((nb && !(nb%wd)) || (a & ((1 << nb) - 1))))			\
       return (CDCERR_INVZPAD);						\
     if (!(f & (CDCF_IGNEQPAD | CDCF_IGNEQMID | CDCF_NOEQPAD)) && nb)	\
       return (CDCERR_INVEQPAD);						\