blob_file_writer.h revision 3f39d5cc753905874d8d93bef94f857b8808f19e
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 25namespace chromeos_update_engine { 26 27class BlobFileWriter { 28 public: 29 // Create the BlobFileWriter object that will manage the blobs stored to 30 // |blob_fd| in a thread safe way. 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, logging will be skipped. 41 void SetTotalBlobs(size_t total_blobs); 42 43 private: 44 size_t total_blobs_{0}; 45 size_t stored_blobs_{0}; 46 47 // The file and its size are protected with the |blob_mutex_|. 48 int blob_fd_; 49 off_t* blob_file_size_; 50 51 base::Lock blob_mutex_; 52 53 DISALLOW_COPY_AND_ASSIGN(BlobFileWriter); 54}; 55 56} // namespace chromeos_update_engine 57 58#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_ 59