1 /*
2  ** Copyright 2017, 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 
17 #ifndef ANDROID_FILE_BLOB_CACHE_H
18 #define ANDROID_FILE_BLOB_CACHE_H
19 
20 #include "BlobCache.h"
21 #include <string>
22 
23 namespace android {
24 
25 uint32_t crc32c(const uint8_t* buf, size_t len);
26 
27 class FileBlobCache : public BlobCache {
28 public:
29     // FileBlobCache attempts to load the saved cache contents from disk into
30     // BlobCache.
31     FileBlobCache(size_t maxKeySize, size_t maxValueSize, size_t maxTotalSize,
32             const std::string& filename);
33 
34     // writeToFile attempts to save the current contents of BlobCache to
35     // disk.
36     void writeToFile();
37 
38     // Return the total size of the cache
39     size_t getSize();
40 
41 private:
42     // mFilename is the name of the file for storing cache contents.
43     std::string mFilename;
44 };
45 
46 } // namespace android
47 
48 #endif // ANDROID_BLOB_CACHE_H
49