playlist: Implement read() and write()

The file will be passed in by the deck layer, since it stores multiple
files.  I just fake up a file in test_2() that is used for storing the
playlist.

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

include/playlist.h

@@ -4,6 +4,7 @@
 #ifndef OCARINA_PLAYLIST_H
 #define OCARINA_PLAYLIST_H
 
+#include <file.h>
 #include <vector>
 
 enum playlist_flags {
@@ -20,6 +21,8 @@ private:
 public:
 	Playlist(playlist_flags);
 	~Playlist();
+	void write(File &);
+	void read(File &);
 
 	void set_flag(playlist_flags);
 	void unset_flag(playlist_flags);

lib/playlist.cpp

@@ -13,6 +13,22 @@ Playlist :: ~Playlist()
 {
 }
 
+void Playlist :: write(File &f)
+{
+	f << flags << " " << tracks.size();
+	for (unsigned int i = 0; i < tracks.size(); i++)
+		f << " " << tracks[i];
+}
+
+void Playlist :: read(File &f)
+{
+	unsigned int n;
+	f >> flags >> n;
+	tracks.resize(n);
+	for (unsigned int i = 0; i < n; i++)
+		f >> tracks[i];
+}
+
 void Playlist :: set_flag(playlist_flags f)
 {
 	flags |= f;

tests/playlist/playlist.cpp

@@ -71,11 +71,44 @@ void test_1()
 	test_add_tracks("1a", plist, 10, 49);
 	print("Test 1b: Plist size: %u\n", plist.size());
 	test_rm_tracks("1c", plist, 10);
+	print("\n");
+}
+
+/* Test read / write */
+void test_2()
+{
+	Playlist plist(PL_ENABLED);
+	Playlist plist2(PL_ENABLED);
+
+	File f("plist.lst", FILE_TYPE_DATA);
+
+	plist.set_flag(PL_RANDOM);
+	test_add_tracks("2a", plist, 0, 99);
+
+	f.open(OPEN_WRITE);
+	plist.write(f);
+	f.close();
+
+	f.open(OPEN_READ);
+	plist2.read(f);
+	f.close();
+
+	print("Test 2b: ");
+	if (plist.get_flags() != plist2.get_flags()) {
+		print("FAILED: flag mismatch\n");
+		return;
+	} else if (plist.size() != plist2.size()) {
+		print("FAILED: size mismatch\n");
+		return;
+	}
+
+	print("SUCCESS\n");
 }
 
 int main(int argc, char **argv)
 {
 	test_0();
 	test_1();
+	test_2();
 	return 0;
 }

tests/playlist/playlist.good

@@ -7,3 +7,6 @@ Test 0f: SUCCESS
 Test 1a: SUCCESS
 Test 1b: Plist size: 40
 Test 1c: SUCCESS
+
+Test 2a: SUCCESS
+Test 2b: SUCCESS