Read tmpl->target as an optional hash (breaks ABI)

blkmaker_jansson.c

@@ -241,6 +241,13 @@ const char *blktmpl_add_jansson(blktemplate_t *tmpl, const json_t *json, time_t
 		}
 	}
 	
+	if ((v = json_object_get(json, "target")) && json_is_string(v))
+	{
+		tmpl->target = malloc(sizeof(*tmpl->target));
+		if (!my_hex2bin(tmpl->target, json_string_value(v), sizeof(*tmpl->target)))
+			return "Error decoding 'target'";
+	}
+	
 	if ((v = json_object_get(json, "mutable")) && json_is_array(v))
 	{
 		for (size_t i = json_array_size(v); i--; )

blktemplate.c

@@ -121,6 +121,7 @@ void blktmpl_free(blktemplate_t *tmpl) {
 		blkaux_clean(&tmpl->auxs[i]);
 	free(tmpl->auxs);
 	free(tmpl->workid);
+	free(tmpl->target);
 	free(tmpl->lp.id);
 	free(tmpl->lp.uri);
 	free(tmpl);

blktemplate.h

@@ -116,7 +116,7 @@ typedef struct {
 	
 	// BIP 23: Basic Pool Extensions
 	int16_t expires;
-	blkhash_t target;
+	blkhash_t *target;
 	
 	// BIP 23: Mutations
 	uint32_t mutations;