mirror of
https://github.com/kidfromjupiter/nearby.git
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107 lines
2.8 KiB
C++
107 lines
2.8 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/shared/file.h"
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#include <algorithm>
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#include <cstddef>
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#include <ios>
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#include <memory>
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#include <string>
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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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namespace location {
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namespace nearby {
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namespace shared {
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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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: file_(std::string(file_path.data(), file_path.size()),
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std::ios::binary | std::ios::in | std::ios::ate),
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path_(file_path),
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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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file_.open(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 shared
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} // namespace nearby
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} // namespace location
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