/************************************************** File Tree Walking EntropySource Header File    ** (C) 1999-2002 The Botan Project                **************************************************/#include <botan/base.h>#ifndef BOTAN_EXT_ENTROPY_SRC_FTW__#define BOTAN_EXT_ENTROPY_SRC_FTW__namespace Botan {class FTW_EntropySource : public EntropySource   {   public:      u32bit fast_poll(byte[], u32bit);      u32bit slow_poll(byte[], u32bit);      FTW_EntropySource(const std::string& = "/proc");   private:      void do_poll(u32bit);      void gather_from_dir(const std::string&, u32bit);      void gather_from_file(const std::string&);      const std::string path;      SecureBuffer<byte, 1024> buffer;      u32bit position, files_read;   };}#endif