--- CBOR-XS/XS.xs	2013/11/22 05:54:07	1.25
+++ CBOR-XS/XS.xs	2013/11/23 18:30:59	1.28
@@ -21,6 +21,9 @@
 #ifndef HvNAMEUTF8
 # define HvNAMEUTF8(hv) 0
 #endif
+#ifndef SvREFCNT_dec_NN
+# define SvREFCNT_dec_NN(sv) SvREFCNT_dec (sv)
+#endif
 
 // known tags
 enum cbor_tag
@@ -81,12 +84,13 @@
 #endif
 
 static HV *cbor_stash, *types_boolean_stash, *types_error_stash, *cbor_tagged_stash; // CBOR::XS::
-static SV *types_true, *types_false, *types_error, *sv_cbor;
+static SV *types_true, *types_false, *types_error, *sv_cbor, *default_filter;
 
 typedef struct {
   U32 flags;
   U32 max_depth;
   STRLEN max_size;
+  SV *filter;
 } CBOR;
 
 ecb_inline void
@@ -96,6 +100,12 @@
   cbor->max_depth = 512;
 }
 
+ecb_inline void
+cbor_free (CBOR *cbor)
+{
+  SvREFCNT_dec (cbor->filter);
+}
+
 /////////////////////////////////////////////////////////////////////////////
 // utility functions
 
@@ -273,11 +283,6 @@
   --enc->depth;
 }
 
-ecb_inline void
-encode_he (enc_t *enc, HE *he)
-{
-}
-
 static void
 encode_hv (enc_t *enc, HV *hv)
 {
@@ -549,6 +554,7 @@
   U32 maxdepth; // recursion depth limit
   AV *shareable;
   AV *stringref;
+  SV *decode_tagged;
 } dec_t;
 
 #define ERR(reason) SB if (!dec->err) dec->err = reason; goto fail; SE
@@ -912,15 +918,42 @@
         {
           sv = decode_sv (dec);
 
-          AV *av = newAV ();
-          av_push (av, newSVuv (tag));
-          av_push (av, sv);
-
-          HV *tagged_stash  = !CBOR_SLOW || cbor_tagged_stash
-                              ? cbor_tagged_stash
-                              : gv_stashpv ("CBOR::XS::Tagged" , 1);
+          dSP;
+          ENTER; SAVETMPS; PUSHMARK (SP);
+          EXTEND (SP, 2);
+          PUSHs (newSVuv (tag));
+          PUSHs (sv);
+
+          PUTBACK;
+          int count = call_sv (dec->cbor.filter ? dec->cbor.filter : default_filter, G_ARRAY | G_EVAL);
+          SPAGAIN;
 
-          sv = sv_bless (newRV_noinc ((SV *)av), tagged_stash);
+          if (SvTRUE (ERRSV))
+            {
+              FREETMPS; LEAVE;
+              ERR (SvPVutf8_nolen (sv_2mortal (SvREFCNT_inc (ERRSV))));
+            }
+
+          if (count)
+            {
+              SvREFCNT_dec (sv);
+              sv = SvREFCNT_inc (POPs);
+            }
+          else
+            {
+              AV *av = newAV ();
+              av_push (av, newSVuv (tag));
+              av_push (av, sv);
+
+              HV *tagged_stash  = !CBOR_SLOW || cbor_tagged_stash
+                                  ? cbor_tagged_stash
+                                  : gv_stashpv ("CBOR::XS::Tagged" , 1);
+              sv = sv_bless (newRV_noinc ((SV *)av), tagged_stash);
+            }
+
+          PUTBACK;
+
+          FREETMPS; LEAVE;
         }
         break;
     }
@@ -1076,6 +1109,8 @@
         types_false = get_bool ("Types::Serialiser::false");
         types_error = get_bool ("Types::Serialiser::error");
 
+        default_filter = newSVpv ("CBOR::XS::default_filter", 0);
+
         sv_cbor = newSVpv ("CBOR", 0);
         SvREADONLY_on (sv_cbor);
 }
@@ -1148,6 +1183,18 @@
 	OUTPUT:
         RETVAL
 
+void filter (CBOR *self, SV *filter = 0)
+	PPCODE:
+        SvREFCNT_dec (self->filter);
+        self->filter = filter ? newSVsv (filter) : filter;
+        XPUSHs (ST (0));
+
+SV *get_filter (CBOR *self)
+	CODE:
+        RETVAL = self->filter ? self->filter : NEWSV (0, 0);
+	OUTPUT:
+        RETVAL
+
 void encode (CBOR *self, SV *scalar)
 	PPCODE:
         PUTBACK; scalar = encode_cbor (scalar, self); SPAGAIN;
@@ -1169,6 +1216,10 @@
         PUSHs (sv_2mortal (newSVuv (offset - SvPVX (cborstr))));
 }
 
+void DESTROY (CBOR *self)
+	PPCODE:
+	cbor_free (self);
+
 PROTOTYPES: ENABLE
 
 void encode_cbor (SV *scalar)