Widevine MediaCas client code that works with Android R

wvutil/include/file_store.h

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+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+//
+// File - Platform independent interface for a File class
+//
+#ifndef WV_UTIL_FILE_STORE_H_
+#define WV_UTIL_FILE_STORE_H_
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "disallow_copy_and_assign.h"
+#include "platform.h"
+#include "util_common.h"
+
+namespace wvutil {
+
+// File class. The implementation is platform dependent.
+class CORE_UTIL_EXPORT File {
+ public:
+  File() {}
+  virtual ~File() {}
+  virtual ssize_t Read(char* buffer, size_t bytes) = 0;
+  virtual ssize_t Write(const char* buffer, size_t bytes) = 0;
+
+  friend class FileSystem;
+  CORE_DISALLOW_COPY_AND_ASSIGN(File);
+};
+
+class CORE_UTIL_EXPORT FileSystem {
+ public:
+  FileSystem();
+  FileSystem(const std::string& origin, void* extra_data);
+  virtual ~FileSystem();
+
+  class Impl;
+
+  // defines as bit flag
+  enum OpenFlags {
+    kNoFlags = 0,
+    kCreate = 1,
+    kReadOnly = 2,  // defaults to read and write access
+    kTruncate = 4
+  };
+
+  virtual std::unique_ptr<File> Open(const std::string& file_path, int flags);
+
+  virtual bool Exists(const std::string& file_path);
+  virtual bool Remove(const std::string& file_path);
+  virtual ssize_t FileSize(const std::string& file_path);
+
+  // Return the filenames stored at dir_path.
+  // dir_path will be stripped from the returned names.
+  virtual bool List(const std::string& dir_path,
+                    std::vector<std::string>* names);
+
+  const std::string& origin() const { return origin_; }
+  void set_origin(const std::string& origin);
+
+  const std::string& identifier() const { return identifier_; }
+  void set_identifier(const std::string& identifier);
+  bool IsGlobal() const { return identifier_.empty(); }
+
+ private:
+  std::unique_ptr<FileSystem::Impl> impl_;
+  std::string origin_;
+  std::string identifier_;
+
+  CORE_DISALLOW_COPY_AND_ASSIGN(FileSystem);
+};
+
+}  // namespace wvutil
+
+#endif  // WV_UTIL_FILE_STORE_H_