The new client can (lazily) read disks now, although nothing's actually done

with the result.

lib/reader.h

@@ -1,6 +1,37 @@
 #ifndef READER_H
 #define READER_H
 
-extern int allTracks();
+class Fluxmap;
+
+class Track
+{
+public:
+    virtual ~Track() {}
+
+    int track;
+    int side;
+
+    Fluxmap& read();
+    void forceReread();
+    virtual void reallyRead() = 0;
+
+protected:
+    bool _read = false;
+    std::unique_ptr<Fluxmap> _fluxmap;    
+};
+
+class CapturedTrack : public Track
+{
+public:
+    void reallyRead();
+};
+
+class FileTrack : public Track
+{
+public:
+    void reallyRead();
+};
+
+extern std::vector<std::unique_ptr<Track>> readTracks();
 
 #endif