db/upnp/Object: add attribute "name"

Call titleToPathElt() only once for each object.

src/db/upnp/Directory.cxx

@@ -22,6 +22,7 @@
 #include "Util.hxx"
 #include "Expat.hxx"
 
+#include <algorithm>
 #include <string>
 #include <vector>
 
@@ -57,6 +58,19 @@ ParseDuration(const std::string &duration)
 	return atoi(v[0].c_str())*3600 + atoi(v[1].c_str())*60 + atoi(v[2].c_str());
 }
 
+/**
+ * Transform titles to turn '/' into '_' to make them acceptable path
+ * elements. There is a very slight risk of collision in doing
+ * this. Twonky returns directory names (titles) like 'Artist/Album'.
+ */
+gcc_pure
+static std::string
+titleToPathElt(std::string s)
+{
+	std::replace(s.begin(), s.end(), '/', '_');
+	return s;
+}
+
 /**
  * An XML parser which builds directory contents from DIDL lite input.
  */
@@ -125,7 +139,7 @@ protected:
 
 	bool checkobjok() {
 		if (m_tobj.m_id.empty() || m_tobj.m_pid.empty() ||
-		    m_tobj.m_title.empty() ||
+		    m_tobj.name.empty() ||
 		    (m_tobj.type == UPnPDirObject::Type::ITEM &&
 		     m_tobj.item_class == UPnPDirObject::ItemClass::UNKNOWN))
 			return false;
@@ -154,8 +168,11 @@ protected:
 		trimstring(str);
 		switch (m_path.back()[0]) {
 		case 'd':
-			if (!m_path.back().compare("dc:title"))
-				m_tobj.m_title += str;
+			if (!m_path.back().compare("dc:title")) {
+				m_tobj.m_title = str;
+				m_tobj.name = titleToPathElt(str);
+			}
+
 			break;
 		case 'r':
 			if (!m_path.back().compare("res")) {

src/db/upnp/Object.hxx

@@ -52,6 +52,12 @@ public:
 	std::string m_id; // ObjectId
 	std::string m_pid; // Parent ObjectId
 	std::string url;
+
+	/**
+	 * A copy of "dc:title" sanitized as a file name.
+	 */
+	std::string name;
+
 	std::string m_title; // dc:title. Directory name for a container.
 	Type type;
 	ItemClass item_class;
@@ -71,8 +77,8 @@ public:
 	 * @param[out] value
 	 * @return true if found.
 	 */
-	const char *getprop(const char *name) const {
-		auto it = m_props.find(name);
+	const char *getprop(const char *_name) const {
+		auto it = m_props.find(_name);
 		if (it == m_props.end())
 			return nullptr;
 		return it->second.c_str();