kge/File.cc

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///
/// \file File.cc
/// \author kyle
/// \created 10/11/23
/// \brief
///
/// \section COPYRIGHT
/// Copyright 2023 K. Isom <kyle@imap.cc>
///
/// Permission to use, copy, modify, and/or distribute this software for
/// any purpose with or without fee is hereby granted, provided that the
/// above copyright notice and this permission notice appear in all copies.
///
/// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
/// WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
/// WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
/// BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
/// OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
/// WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
/// ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
/// SOFTWARE.
///
#include <filesystem>
#include <utility>
#include "File.h"
File::File(std::string fPath)
: path(fPath), readOnly(false)
{
}
File::File(std::filesystem::path fPath)
: path(std::move(fPath)), readOnly(false)
{
}
const std::string File::Path()
{
return this->path.string();
}
void File::SetPath(const std::string &fPath)
{
File::path = fPath;
}
OptOutFileStream File::Flush()
{
// Exit early if we shouldn't be writing to the file.
if (this->IsReadOnly()) {
return std::nullopt;
}
if (!this->Exists()) {
if (!this->IsWriteable()) {
return std::nullopt;
}
return {new std::ofstream(this->path, std::ios::out|std::ios::trunc)};
}
return {new std::ofstream(this->path, std::ios::out)};
}
OptInFileStream
File::Refresh()
{
if (!this->Exists()) {
return std::nullopt;
}
return {new std::ifstream(this->path, std::ios::in)};
}
size_t
File::Size()
{
return std::filesystem::file_size(this->path);
}
bool
File::Exists()
{
return std::filesystem::exists(this->path);
}
static bool
checkAccess(std::filesystem::path path, std::filesystem::perms mode, bool checkParent)
{
if (!std::filesystem::exists(path) && checkParent) {
auto fullPath = std::filesystem::absolute(path);
auto parent = fullPath.parent_path();
auto dirEnt = std::filesystem::directory_entry(parent);
auto perms = dirEnt.status().permissions();
return (perms & mode) != std::filesystem::perms::none;
}
return (status(path).permissions() & mode) != std::filesystem::perms::none;
}
bool
File::IsWriteable()
{
return checkAccess(this->path, std::filesystem::perms::owner_write, true);
}
bool
File::IsReadable()
{
return checkAccess(this->path, std::filesystem::perms::owner_read, false);
}
bool
File::IsReadWriteable()
{
auto checkMode = std::filesystem::perms::owner_read | std::filesystem::perms::owner_write;
return checkAccess(this->path, checkMode, true);
}