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