[thin_show_dups] variable_chunk_stream

thin-provisioning/variable_chunk_stream.h

@@ -0,0 +1,42 @@
+#ifndef THIN_PROVISIONING_VARIABLE_CHUNK_STREAM_H
+#define THIN_PROVISIONING_VARIABLE_CHUNK_STREAM_H
+
+#include "base/rolling_hash.h"
+#include "thin-provisioning/chunk_stream.h"
+
+//----------------------------------------------------------------
+
+namespace thin_provisioning {
+	class variable_chunk_stream : public chunk_stream {
+	public:
+		// window_size must be a power of 2
+		variable_chunk_stream(chunk_stream &stream, unsigned window_size);
+		~variable_chunk_stream();
+
+		// FIXME: we don't know in advance how many chunks we will have
+		virtual void rewind();
+		virtual bool next(bcache::block_address count = 1ull);
+		virtual bool eof() const;
+		virtual bcache::block_address index() const;
+		virtual chunk const &get();
+		virtual void put(chunk const &c);
+
+	private:
+		bool next_big_chunk();
+		bool advance_one();
+		void put_big_chunk();
+
+		bcache::block_address index_;
+		base::content_based_hash h_;
+
+		chunk_stream &stream_;
+		chunk const *big_chunk_;
+
+		uint8_t *little_b_, *little_e_;
+		chunk little_chunk_;
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif