Validate peer state response content against the hash. (#190)

src/hpfs/hpfs.hpp

@@ -18,6 +18,9 @@ namespace hpfs
         }
     };
 
+    // File block size;
+    constexpr size_t BLOCK_SIZE = 4194304; // 4MB
+
     int start_merge_process(pid_t &hpfs_pid);
     int start_ro_rw_process(pid_t &hpfs_pid, std::string &mount_dir, const bool readonly,
                             const bool hash_map_enabled, const bool auto_start_session, const uint16_t timeout = 4000);