1 /* 2 * Copyright (C) 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #pragma once 17 18 #include <map> 19 #include <string> 20 21 #include "ClearKeyTypes.h" 22 23 namespace clearkeydrm { 24 25 // Using android file system requires clearkey plugin to update 26 // its sepolicy. However, we are unable to update sepolicy for 27 // older vendor partitions. To provide backward compatibility, 28 // clearkey plugin implements a very simple file system in memory. 29 // This memory file system does not support directory structure. 30 class MemoryFileSystem { 31 public: 32 struct MemoryFile { 33 std::string fileName; // excludes path 34 std::string content; 35 size_t fileSize; 36 getContentMemoryFile37 std::string getContent() const { return content; } getFileSizeMemoryFile38 size_t getFileSize() const { return fileSize; } setContentMemoryFile39 void setContent(const std::string& file) { content = file; } setFileNameMemoryFile40 void setFileName(const std::string& name) { fileName = name; } setFileSizeMemoryFile41 void setFileSize(size_t size) { 42 content.resize(size); 43 fileSize = size; 44 } 45 }; 46 MemoryFileSystem()47 MemoryFileSystem(){}; ~MemoryFileSystem()48 virtual ~MemoryFileSystem(){}; 49 50 bool FileExists(const std::string& fileName) const; 51 ssize_t GetFileSize(const std::string& fileName) const; 52 std::vector<std::string> ListFiles() const; 53 size_t Read(const std::string& pathName, std::string* buffer); 54 bool RemoveAllFiles(); 55 bool RemoveFile(const std::string& fileName); 56 size_t Write(const std::string& pathName, const MemoryFile& memoryFile); 57 58 private: 59 // License file name is made up of a unique keySetId, therefore, 60 // the filename can be used as the key to locate licenses in the 61 // memory file system. 62 std::map<std::string, MemoryFile> mMemoryFileSystem; 63 64 std::string GetFileName(const std::string& path); 65 66 CLEARKEY_DISALLOW_COPY_AND_ASSIGN(MemoryFileSystem); 67 }; 68 69 } // namespace clearkeydrm 70