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      1 // Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
      2 // source code may only be used and distributed under the Widevine Master
      3 // License Agreement.
      4 
      5 #include <utils/Log.h>
      6 #include <string>
      7 
      8 #include "MemoryFileSystem.h"
      9 #include "Utils.h"
     10 
     11 namespace android {
     12 namespace hardware {
     13 namespace drm {
     14 namespace V1_2 {
     15 namespace clearkey {
     16 
     17 std::string MemoryFileSystem::GetFileName(const std::string& path) {
     18     size_t index = path.find_last_of("/");
     19     if (index != std::string::npos) {
     20         return path.substr(index+1);
     21     } else {
     22         return path;
     23     }
     24 }
     25 
     26 bool MemoryFileSystem::FileExists(const std::string& fileName) const {
     27     auto result = mMemoryFileSystem.find(fileName);
     28     return result != mMemoryFileSystem.end();
     29 }
     30 
     31 ssize_t MemoryFileSystem::GetFileSize(const std::string& fileName) const {
     32     auto result = mMemoryFileSystem.find(fileName);
     33     if (result != mMemoryFileSystem.end()) {
     34         return static_cast<ssize_t>(result->second.getFileSize());
     35     } else {
     36         ALOGE("Failed to get size for %s", fileName.c_str());
     37         return -1;
     38     }
     39 }
     40 
     41 std::vector<std::string> MemoryFileSystem::ListFiles() const {
     42     std::vector<std::string> list;
     43     for (const auto& filename : mMemoryFileSystem) {
     44         list.push_back(filename.first);
     45     }
     46     return list;
     47 }
     48 
     49 size_t MemoryFileSystem::Read(const std::string& path, std::string* buffer) {
     50     std::string key = GetFileName(path);
     51     auto result = mMemoryFileSystem.find(key);
     52     if (result != mMemoryFileSystem.end()) {
     53         std::string serializedHashFile = result->second.getContent();
     54         buffer->assign(serializedHashFile);
     55         return buffer->size();
     56     } else {
     57         ALOGE("Failed to read from %s", path.c_str());
     58         return -1;
     59     }
     60 }
     61 
     62 size_t MemoryFileSystem::Write(const std::string& path, const MemoryFile& memoryFile) {
     63     std::string key = GetFileName(path);
     64     auto result = mMemoryFileSystem.find(key);
     65     if (result != mMemoryFileSystem.end()) {
     66         mMemoryFileSystem.erase(key);
     67     }
     68     mMemoryFileSystem.insert(std::pair<std::string, MemoryFile>(key, memoryFile));
     69     return memoryFile.getFileSize();
     70 }
     71 
     72 bool MemoryFileSystem::RemoveFile(const std::string& fileName) {
     73     auto result = mMemoryFileSystem.find(fileName);
     74     if (result != mMemoryFileSystem.end()) {
     75         mMemoryFileSystem.erase(result);
     76         return true;
     77     } else {
     78         ALOGE("Cannot find license to remove: %s", fileName.c_str());
     79         return false;
     80     }
     81 }
     82 
     83 bool MemoryFileSystem::RemoveAllFiles() {
     84     mMemoryFileSystem.clear();
     85     return mMemoryFileSystem.empty();
     86 }
     87 
     88 } // namespace clearkey
     89 } // namespace V1_2
     90 } // namespace drm
     91 } // namespace hardware
     92 } // namespace android
     93