1 // 2 // Copyright (C) 2009 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 #include "update_engine/payload_consumer/file_writer.h" 18 19 #include <errno.h> 20 21 namespace chromeos_update_engine { 22 23 int DirectFileWriter::Open(const char* path, int flags, mode_t mode) { 24 CHECK_EQ(fd_, -1); 25 fd_ = open(path, flags, mode); 26 if (fd_ < 0) 27 return -errno; 28 return 0; 29 } 30 31 bool DirectFileWriter::Write(const void* bytes, size_t count) { 32 CHECK_GE(fd_, 0); 33 const char* char_bytes = reinterpret_cast<const char*>(bytes); 34 35 size_t bytes_written = 0; 36 while (bytes_written < count) { 37 ssize_t rc = write(fd_, char_bytes + bytes_written, 38 count - bytes_written); 39 if (rc < 0) 40 return false; 41 bytes_written += rc; 42 } 43 CHECK_EQ(bytes_written, count); 44 return bytes_written == count; 45 } 46 47 int DirectFileWriter::Close() { 48 CHECK_GE(fd_, 0); 49 int rc = close(fd_); 50 51 // This can be any negative number that's not -1. This way, this FileWriter 52 // won't be used again for another file. 53 fd_ = -2; 54 55 if (rc < 0) 56 return -errno; 57 return rc; 58 } 59 60 } // namespace chromeos_update_engine 61
