1 // 2 // Copyright (C) 2015 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 UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_ 18 #define UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_ 19 20 #include <base/macros.h> 21 22 #include <base/synchronization/lock.h> 23 #include <brillo/secure_blob.h> 24 25 namespace chromeos_update_engine { 26 27 class BlobFileWriter { 28 public: 29 // Create the BlobFileWriter object that will manage the blobs stored to 30 // |blob_fd| in a thread safe way. BlobFileWriter(int blob_fd,off_t * blob_file_size)31 BlobFileWriter(int blob_fd, off_t* blob_file_size) 32 : blob_fd_(blob_fd), 33 blob_file_size_(blob_file_size) {} 34 35 // Store the passed |blob| in the blob file. Returns the offset at which it 36 // was stored, or -1 in case of failure. 37 off_t StoreBlob(const brillo::Blob& blob); 38 39 // The number of |total_blobs| is the number of blobs that will be stored but 40 // is only used for logging purposes. If not set or set to 0, logging will be 41 // skipped. This function will also reset the number of stored blobs to 0. 42 void SetTotalBlobs(size_t total_blobs); 43 44 private: 45 size_t total_blobs_{0}; 46 size_t stored_blobs_{0}; 47 48 // The file and its size are protected with the |blob_mutex_|. 49 int blob_fd_; 50 off_t* blob_file_size_; 51 52 base::Lock blob_mutex_; 53 54 DISALLOW_COPY_AND_ASSIGN(BlobFileWriter); 55 }; 56 57 } // namespace chromeos_update_engine 58 59 #endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_ 60