1 files changed, 24 insertions, 0 deletions
diff --git a/Src/replicant/nu/ProgressTracker.h b/Src/replicant/nu/ProgressTracker.h
new file mode 100644
index 00000000..83f01802
--- /dev/null
+++ b/Src/replicant/nu/ProgressTracker.h
@@ -0,0 +1,24 @@
+#pragma once
+#include "foundation/types.h"
+#include <map>
+#include "nu/AutoLock.h"
+
+/* Helper class for managing valid chunks in non-sequential scenarios 
+e.g. progressive downloading */
+
+class ProgressTracker
+{
+public:
+	static const uint64_t null_position;
+	ProgressTracker();
+	void Write(uint64_t bytes_written);
+	bool Valid(uint64_t requested_position, uint64_t requested_end, uint64_t *available=0);
+	bool Seek(uint64_t requested_position, uint64_t requested_end, uint64_t *new_start, uint64_t *new_end);
+	void Dump();
+
+	typedef std::map<uint64_t, uint64_t> ChunkList;
+	ChunkList chunks;
+	uint64_t current_chunk;
+	uint64_t current_position;
+	nu::LockGuard list_guard;
+};