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// Copyright 2020 Google LLC
//
// 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
//
// https://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 "internal/platform/implementation/shared/file.h"
#include <cstddef>
#include <memory>
#include "absl/memory/memory.h"
#include "absl/strings/string_view.h"
#include "internal/platform/exception.h"
namespace location {
namespace nearby {
namespace shared {
// InputFile
std::unique_ptr<IOFile> IOFile::CreateInputFile(const absl::string_view path,
size_t size) {
return absl::WrapUnique(new IOFile(path, size));
}
IOFile::IOFile(const absl::string_view path, size_t size)
: file_(std::string(path.data(), path.size()),
std::ios::binary | std::ios::in),
path_(path),
total_size_(size) {}
std::unique_ptr<IOFile> IOFile::CreateOutputFile(const absl::string_view path) {
return std::unique_ptr<IOFile>(new IOFile(path));
}
IOFile::IOFile(const absl::string_view path)
: file_(std::string(path.data(), path.size()),
std::ios::binary | std::ios::out | std::ios::trunc),
total_size_(0) {}
ExceptionOr<ByteArray> IOFile::Read(std::int64_t size) {
if (!file_.is_open()) {
return ExceptionOr<ByteArray>{Exception::kIo};
}
if (file_.peek() == EOF) {
return ExceptionOr<ByteArray>{ByteArray{}};
}
if (!file_.good()) {
return ExceptionOr<ByteArray>{Exception::kIo};
}
ByteArray bytes(size);
std::unique_ptr<char[]> read_bytes{new char[size]};
file_.read(read_bytes.get(), static_cast<ptrdiff_t>(size));
auto num_bytes_read = file_.gcount();
if (num_bytes_read == 0) {
return ExceptionOr<ByteArray>{Exception::kIo};
}
return ExceptionOr<ByteArray>(ByteArray(read_bytes.get(), num_bytes_read));
}
Exception IOFile::Close() {
if (file_.is_open()) {
file_.close();
}
return {Exception::kSuccess};
}
Exception IOFile::Write(const ByteArray& data) {
if (!file_.is_open()) {
return {Exception::kIo};
}
if (!file_.good()) {
return {Exception::kIo};
}
file_.write(data.data(), data.size());
file_.flush();
return {file_.good() ? Exception::kSuccess : Exception::kIo};
}
Exception IOFile::Flush() {
file_.flush();
return {file_.good() ? Exception::kSuccess : Exception::kIo};
}
} // namespace shared
} // namespace nearby
} // namespace location
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