71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
//
|
|
// Copyright (C) 2014 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 "shill/protobuf_lite_streams.h"
|
|
|
|
#include <fcntl.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <base/files/file_util.h>
|
|
#include <base/posix/eintr_wrapper.h>
|
|
|
|
using google::protobuf::io::CopyingInputStream;
|
|
using google::protobuf::io::CopyingInputStreamAdaptor;
|
|
using std::string;
|
|
|
|
namespace shill {
|
|
|
|
CopyingInputStreamAdaptor* protobuf_lite_file_input_stream(
|
|
const string& file_path) {
|
|
int fd = HANDLE_EINTR(open(file_path.c_str(), O_RDONLY));
|
|
if (fd == -1) {
|
|
PLOG(ERROR) << __func__ << ": "
|
|
<< "Could not load protobuf file [" << file_path << "] ";
|
|
return nullptr;
|
|
}
|
|
|
|
auto* file_stream(new ProtobufLiteCopyingFileInputStream(fd));
|
|
auto* adaptor(new CopyingInputStreamAdaptor(
|
|
static_cast<CopyingInputStream*>(file_stream)));
|
|
// Pass ownership of |file_stream|.
|
|
adaptor->SetOwnsCopyingStream(true);
|
|
return adaptor;
|
|
}
|
|
|
|
|
|
ProtobufLiteCopyingFileInputStream::ProtobufLiteCopyingFileInputStream(int fd)
|
|
: fd_(fd),
|
|
scoped_fd_closer_(fd_),
|
|
previous_seek_failed_(false) {}
|
|
|
|
ProtobufLiteCopyingFileInputStream::~ProtobufLiteCopyingFileInputStream() {}
|
|
|
|
int ProtobufLiteCopyingFileInputStream::Read(void* buffer, int size) {
|
|
return HANDLE_EINTR(read(fd_, buffer, size));
|
|
}
|
|
|
|
int ProtobufLiteCopyingFileInputStream::Skip(int count) {
|
|
if (!previous_seek_failed_ &&
|
|
lseek(fd_, count, SEEK_CUR) != static_cast<off_t>(-1)) {
|
|
// seek succeeded.
|
|
return count;
|
|
}
|
|
// Let's not attempt to seek again later.
|
|
previous_seek_failed_ = true;
|
|
return CopyingInputStream::Skip(count);
|
|
}
|
|
|
|
} // namespace shill
|