mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 07:06:11 -04:00
Timothy Hutchins
ff9438a3ed
This is the start of the implementing for the Linux platform. I aim to make this as similar to the Windows platform as possible, although due to the fundamental difference in the two OS's, there will be things that need to be different. As such, I will be using the Windows platform files as a base, and reimplementing the functions with Linux equivalents. I am sure this will have bugs, which by my best attempt will be fixed when found.
112 lines
3.1 KiB
C++
112 lines
3.1 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "internal/platform/implementation/linux/file.h"
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#include <algorithm>
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#include <codecvt>
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#include <cstddef>
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#include <ios>
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#include <locale>
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#include <memory>
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#include <string>
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#include <filesystem>
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#include "absl/memory/memory.h"
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#include "absl/strings/string_view.h"
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#include "internal/platform/exception.h"
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#include "internal/platform/implementation/linux/utils.h"
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namespace nearby {
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namespace linux {
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// InputFile
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std::unique_ptr<IOFile> IOFile::CreateInputFile(
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const absl::string_view file_path, size_t size) {
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return absl::WrapUnique(new IOFile(file_path, size));
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}
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IOFile::IOFile(const absl::string_view file_path, size_t size)
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: path_(file_path) {
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// Always open input file path as wide string on Linux platform.
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file_.open(std::filesystem::path(linux::string_to_wstring(path_)), std::ios::binary | std::ios::in | std::ios::ate);
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total_size_ = file_.tellg();
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file_.seekg(0);
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}
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std::unique_ptr<IOFile> IOFile::CreateOutputFile(const absl::string_view path) {
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return std::unique_ptr<IOFile>(new IOFile(path));
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}
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IOFile::IOFile(const absl::string_view file_path)
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: file_(), path_(file_path), total_size_(0) {
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// Always open input file path as wide string on Windows platform.
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std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
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file_.open(std::filesystem::path(converter.from_bytes(path_)), std::ios::binary | std::ios::out);
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}
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ExceptionOr<ByteArray> IOFile::Read(std::int64_t size) {
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if (!file_.is_open()) {
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return ExceptionOr<ByteArray>{Exception::kIo};
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}
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if (file_.peek() == EOF) {
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return ExceptionOr<ByteArray>{ByteArray{}};
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}
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if (!file_.good()) {
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return ExceptionOr<ByteArray>{Exception::kIo};
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}
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ByteArray bytes(size);
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std::unique_ptr<char[]> read_bytes{new char[size]};
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file_.read(read_bytes.get(), static_cast<ptrdiff_t>(size));
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auto num_bytes_read = file_.gcount();
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if (num_bytes_read == 0) {
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return ExceptionOr<ByteArray>{Exception::kIo};
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}
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return ExceptionOr<ByteArray>(ByteArray(read_bytes.get(), num_bytes_read));
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}
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Exception IOFile::Close() {
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if (file_.is_open()) {
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file_.close();
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}
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return {Exception::kSuccess};
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}
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Exception IOFile::Write(const ByteArray& data) {
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if (!file_.is_open()) {
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return {Exception::kIo};
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}
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if (!file_.good()) {
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return {Exception::kIo};
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}
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file_.write(data.data(), data.size());
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file_.flush();
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return {file_.good() ? Exception::kSuccess : Exception::kIo};
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}
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Exception IOFile::Flush() {
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file_.flush();
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return {file_.good() ? Exception::kSuccess : Exception::kIo};
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}
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} // namespace linux
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} // namespace nearby
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