1 files changed, 13 insertions, 0 deletions
diff --git a/src/data.h b/src/data.h
index 063187a6..d8cd1fe6 100644
--- a/src/data.h
+++ b/src/data.h
@@ -48,6 +48,19 @@
 namespace dcp {
 
 
+class ConstantData
+{
+public:
+	virtual ~ConstantData() {}
+
+	void write (boost::filesystem::path file) const;
+	void write_via_temp (boost::filesystem::path temp, boost::filesystem::path final) const;
+
+	virtual uint8_t const * data () const = 0;
+	virtual int size () const = 0;
+};
+
+
 class Data
 {
 public: