deck: Save and restore the playlist deck

The read and write functions will be called by a higher up layer, so I
need to open the file manually in the test.

Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>

design/deck.txt

@@ -16,7 +16,7 @@ Deck: (lib/deck.cpp)
 - Deck:
 	list<Playlist> deck;
 
-	File << current_track << deck.size() << endl;
+	File << deck.size() << endl;
 	File << deck[0] << endl;
 	File << deck[N] << endl;
 

include/deck.h

@@ -9,6 +9,9 @@
 namespace deck
 {
 
+	void read(File &);
+	void write(File &);
+
 	Playlist *create();
 	void remove(unsigned int);
 	Playlist *get(unsigned int);
@@ -16,6 +19,7 @@ namespace deck
 	unsigned int next();
 
 #ifdef CONFIG_DEBUG
+	void reset();
 	void print_info();
 #endif /* CONFIG_DEBUG */
 

include/playlist.h

@@ -20,6 +20,7 @@ private:
 	unsigned int cur;
 
 public:
+	Playlist();
 	Playlist(playlist_flags);
 	~Playlist();
 	void write(File &);

lib/deck.cpp

@@ -8,6 +8,29 @@
 
 static std::list<Playlist> playlist_deck;
 
+void deck :: read(File &f)
+{
+	unsigned int num;
+	std::list<Playlist>::iterator it;
+
+	f >> num;
+	playlist_deck.resize(num);
+
+	for (it = playlist_deck.begin(); it != playlist_deck.end(); it++)
+		it->read(f);
+}
+
+void deck :: write(File &f)
+{
+	std::list<Playlist>::iterator it;
+
+	f << playlist_deck.size() << std :: endl;
+	for (it = playlist_deck.begin(); it != playlist_deck.end(); it++) {
+		it->write(f);
+		f << std::endl;
+	}
+}
+
 Playlist *deck :: create()
 {
 	playlist_deck.push_back(Playlist(PL_ENABLED));
@@ -66,6 +89,11 @@ unsigned int deck :: next()
 }
 
 #ifdef CONFIG_DEBUG
+void deck :: reset()
+{
+	playlist_deck.clear();
+}
+
 void deck :: print_info()
 {
 	unsigned int i = 0;

lib/playlist.cpp

@@ -4,6 +4,11 @@
 #include <playlist.h>
 #include <stdlib.h>
 
+Playlist :: Playlist()
+	 : flags(0), cur(-1)
+{
+}
+
 Playlist :: Playlist(playlist_flags f)
 	 : flags(f), cur(-1)
 {

tests/deck/deck.cpp

@@ -88,6 +88,35 @@ void test_4()
 		}
 	}
 
+	deck :: print_info();
+	print("\n");
+}
+
+/* Test load / save functions */
+void test_5()
+{
+	print("Test 5:\n");
+
+	deck :: get(1)->set_flag(PL_ENABLED);
+	deck :: get(2)->set_flag(PL_ENABLED);
+	deck :: get(2)->set_flag(PL_RANDOM);
+
+	File f("playlist.lst", FILE_TYPE_DATA);
+
+	print("Saving playlist deck\n");
+	f.open(OPEN_WRITE);
+	deck :: write(f);
+	f.close();
+
+	print("Clearing deck\n");
+	deck :: reset();
+	deck :: print_info();
+
+	print("Reading back playlist deck\n");
+	f.open(OPEN_READ);
+	deck :: read(f);
+	f.close();
+
 	deck :: print_info();
 }
 
@@ -98,5 +127,6 @@ int main(int argc, char **argv)
 	test_2();
 	test_3();
 	test_4();
+	test_5();
 	return 0;
 }

tests/deck/deck.good

@@ -113,3 +113,11 @@ No playable tracks!
 deck[0] = Playlist { size = 16, flags = 0 }
 deck[1] = Playlist { size = 19, flags = 0 }
 deck[2] = Playlist { size = 15, flags = 0 }
+
+Test 5:
+Saving playlist deck
+Clearing deck
+Reading back playlist deck
+deck[0] = Playlist { size = 16, flags = 0 }
+deck[1] = Playlist { size = 19, flags = 1 }
+deck[2] = Playlist { size = 15, flags = 3 }