Tag: add methods RemoveAll(), RemoveType()

src/tag/Tag.cxx

@@ -223,3 +223,23 @@ Tag::AddItem(TagType type, const char *value)
 {
 	AddItem(type, value, strlen(value));
 }
+
+void
+Tag::RemoveType(TagType type)
+{
+	auto dest = items, src = items, end = items + num_items;
+
+	tag_pool_lock.lock();
+	while (src != end) {
+		TagItem *item = *src++;
+		if (item->type == type)
+			/* remove it */
+			tag_pool_put_item(item);
+		else
+			/* keep it */
+			*dest++ = item;
+	}
+	tag_pool_lock.unlock();
+
+	num_items = dest - items;
+}

src/tag/Tag.hxx

@@ -122,6 +122,18 @@ struct Tag {
 	void AddItem(TagType type, const char *value);
 
 	/**
+	 * Removes all tag items.
+	 */
+	void RemoveAll() {
+		num_items = 0;
+	}
+
+	/**
+	 * Removes all tag items of the specified type.
+	 */
+	void RemoveType(TagType type);
+
+	/**
 	 * Merges the data from two tags.  If both tags share data for the
 	 * same TagType, only data from "add" is used.
 	 *