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 #include <utils/Log.h>
17 #include <string>
18 #include <vector>
19
20 #include "MemoryFileSystem.h"
21
22 namespace clearkeydrm {
23
GetFileName(const std::string & path)24 std::string MemoryFileSystem::GetFileName(const std::string& path) {
25 size_t index = path.find_last_of('/');
26 if (index != std::string::npos) {
27 return path.substr(index + 1);
28 } else {
29 return path;
30 }
31 }
32
FileExists(const std::string & fileName) const33 bool MemoryFileSystem::FileExists(const std::string& fileName) const {
34 auto result = mMemoryFileSystem.find(fileName);
35 return result != mMemoryFileSystem.end();
36 }
37
GetFileSize(const std::string & fileName) const38 ssize_t MemoryFileSystem::GetFileSize(const std::string& fileName) const {
39 auto result = mMemoryFileSystem.find(fileName);
40 if (result != mMemoryFileSystem.end()) {
41 return static_cast<ssize_t>(result->second.getFileSize());
42 } else {
43 ALOGE("Failed to get size for %s", fileName.c_str());
44 return -1;
45 }
46 }
47
ListFiles() const48 std::vector<std::string> MemoryFileSystem::ListFiles() const {
49 std::vector<std::string> list;
50 for (const auto& filename : mMemoryFileSystem) {
51 list.push_back(filename.first);
52 }
53 return list;
54 }
55
Read(const std::string & path,std::string * buffer)56 size_t MemoryFileSystem::Read(const std::string& path, std::string* buffer) {
57 std::string key = GetFileName(path);
58 auto result = mMemoryFileSystem.find(key);
59 if (result != mMemoryFileSystem.end()) {
60 std::string serializedHashFile = result->second.getContent();
61 buffer->assign(serializedHashFile);
62 return buffer->size();
63 } else {
64 ALOGE("Failed to read from %s", path.c_str());
65 return -1;
66 }
67 }
68
Write(const std::string & path,const MemoryFile & memoryFile)69 size_t MemoryFileSystem::Write(const std::string& path, const MemoryFile& memoryFile) {
70 std::string key = GetFileName(path);
71 auto result = mMemoryFileSystem.find(key);
72 if (result != mMemoryFileSystem.end()) {
73 mMemoryFileSystem.erase(key);
74 }
75 mMemoryFileSystem.insert(std::pair<std::string, MemoryFile>(key, memoryFile));
76 return memoryFile.getFileSize();
77 }
78
RemoveFile(const std::string & fileName)79 bool MemoryFileSystem::RemoveFile(const std::string& fileName) {
80 auto result = mMemoryFileSystem.find(fileName);
81 if (result != mMemoryFileSystem.end()) {
82 mMemoryFileSystem.erase(result);
83 return true;
84 } else {
85 ALOGE("Cannot find license to remove: %s", fileName.c_str());
86 return false;
87 }
88 }
89
RemoveAllFiles()90 bool MemoryFileSystem::RemoveAllFiles() {
91 mMemoryFileSystem.clear();
92 return mMemoryFileSystem.empty();
93 }
94
95 } // namespace clearkeydrm
96