blob: 2f5ecee57cc87b1c538ae1af595176c3f5c16f15 [file] [log] [blame]
//
// Copyright (C) 2009 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include "update_engine/file_writer.h"
#include <errno.h>
namespace chromeos_update_engine {
int DirectFileWriter::Open(const char* path, int flags, mode_t mode) {
CHECK_EQ(fd_, -1);
fd_ = open(path, flags, mode);
if (fd_ < 0)
return -errno;
return 0;
}
bool DirectFileWriter::Write(const void* bytes, size_t count) {
CHECK_GE(fd_, 0);
const char* char_bytes = reinterpret_cast<const char*>(bytes);
size_t bytes_written = 0;
while (bytes_written < count) {
ssize_t rc = write(fd_, char_bytes + bytes_written,
count - bytes_written);
if (rc < 0)
return false;
bytes_written += rc;
}
CHECK_EQ(bytes_written, count);
return bytes_written == count;
}
int DirectFileWriter::Close() {
CHECK_GE(fd_, 0);
int rc = close(fd_);
// This can be any negative number that's not -1. This way, this FileWriter
// won't be used again for another file.
fd_ = -2;
if (rc < 0)
return -errno;
return rc;
}
} // namespace chromeos_update_engine