General Purpose library for Freestanding C++ and POSIX systems
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2.5 KiB

#pragma once
#include "gp_config.hpp"
#include "gp/allocator/aggregator.hpp"
#include "gp/buffer.hpp"
#include "gp/optional.hpp"
#include "gp/variant.hpp"
#include "gp/vfs/fs_types.hpp"
#include <stddef.h>
namespace gp {
class vfs {
private:
struct virtual_fs
{
virtual ~virtual_fs() = default;
virtual fs::open_return open(buffer<char>, fs::file_flags, fs::file_permissions) = 0;
virtual fs::read_return read(gp_config::file_descriptor_t, buffer<char>) = 0;
virtual fs::write_return write(gp_config::file_descriptor_t, buffer<char>, size_t) = 0;
virtual fs::close_return close(gp_config::file_descriptor_t) = 0;
};
template<typename concrete>
class abstract_fs final : public virtual_fs{
concrete internal_representation;
public:
abstract_fs(abstract_fs& v) = delete;
abstract_fs(abstract_fs&& v)
: internal_representation{v.internal_representation}
{}
abstract_fs(concrete& v) = delete;
abstract_fs(concrete&& v)
: internal_representation{v}
{}
virtual ~abstract_fs() override = default;
virtual fs::open_return open(buffer<char> path, fs::file_flags flags, fs::file_permissions perms) override {
return internal_representation.open(path, flags, perms);
}
virtual fs::read_return read(gp_config::file_descriptor_t fd, buffer<char> buff) override {
return internal_representation.read(fd, buff);
}
virtual fs::write_return write(gp_config::file_descriptor_t fd, buffer<char> buff, size_t offset) override {
return internal_representation.write(fd, buff, offset);
}
virtual fs::close_return close(gp_config::file_descriptor_t fd) override {
return internal_representation.close(fd);
}
};
reference_wrapper<aggregator> allocator;
virtual_fs* file_system;
public:
template<typename T>
vfs(T&& v, reference_wrapper<aggregator> _ref)
: allocator{_ref}
, file_system{new(allocator.get().allocate(sizeof(T))) T(gp::move(v))}
{}
fs::open_return open(buffer<char> path, fs::file_flags flags, fs::file_permissions perms) {
return file_system->open(path, flags, perms);
}
fs::read_return read(gp_config::file_descriptor_t fd, buffer<char> buff) {
return file_system->read(fd, buff);
}
fs::write_return write(gp_config::file_descriptor_t fd, buffer<char> buff, size_t offset) {
return file_system->write(fd, buff, offset);
}
fs::close_return close(gp_config::file_descriptor_t fd) {
return file_system->close(fd);
}
~vfs() {
file_system->~virtual_fs();
allocator.get().deallocate(file_system);
}
};
}