import ffi solution from TVM

src/runtime/file_util.h

+/*!
+ *  Copyright (c) 2017 by Contributors
+ * \file file_util.h
+ * \brief Minimum file manipulation util for runtime.
+ */
+#ifndef TVM_RUNTIME_FILE_UTIL_H_
+#define TVM_RUNTIME_FILE_UTIL_H_
+
+#include <string>
+#include "meta_data.h"
+
+namespace tvm {
+namespace runtime {
+/*!
+ * \brief Get file format from given file name or format argument.
+ * \param file_name The name of the file.
+ * \param format The format of the file.
+ */
+std::string GetFileFormat(const std::string& file_name,
+                          const std::string& format);
+
+/*!
+ * \return the directory in which TVM stores cached files.
+ *         May be set using TVM_CACHE_DIR; defaults to system locations.
+ */
+std::string GetCacheDir();
+
+/*!
+ * \brief Get meta file path given file name and format.
+ * \param file_name The name of the file.
+ */
+std::string GetMetaFilePath(const std::string& file_name);
+
+/*!
+ * \brief Get file basename (i.e. without leading directories)
+ * \param file_name The name of the file.
+ * \return the base name
+ */
+std::string GetFileBasename(const std::string& file_name);
+
+/*!
+ * \brief Load binary file into a in-memory buffer.
+ * \param file_name The name of the file.
+ * \param data The data to be loaded.
+ */
+void LoadBinaryFromFile(const std::string& file_name,
+                        std::string* data);
+
+/*!
+ * \brief Load binary file into a in-memory buffer.
+ * \param file_name The name of the file.
+ * \param data The binary data to be saved.
+ */
+void SaveBinaryToFile(const std::string& file_name,
+                      const std::string& data);
+
+/*!
+ * \brief Save meta data to file.
+ * \param file_name The name of the file.
+ * \param fmap The function info map.
+ */
+void SaveMetaDataToFile(
+    const std::string& file_name,
+    const std::unordered_map<std::string, FunctionInfo>& fmap);
+
+/*!
+ * \brief Load meta data to file.
+ * \param file_name The name of the file.
+ * \param fmap The function info map.
+ */
+void LoadMetaDataFromFile(
+    const std::string& file_name,
+    std::unordered_map<std::string, FunctionInfo>* fmap);
+}  // namespace runtime
+}  // namespace tvm
+#endif  // TVM_RUNTIME_FILE_UTIL_H_

dlpack @ bee4d1dd

+Subproject commit bee4d1dd8dc1ee4a1fd8fa6a96476c2f8b7492a3

dmlc-core @ ee773cd6

+Subproject commit ee773cd6ab2a32c07cf3f09ebaf9205ddf0a616e