Atmosphere/libraries/libstratosphere/include/stratosphere/fs/fs_read_only_filesystem.hpp

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/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stratosphere/fs/fs_common.hpp>
#include <stratosphere/fs/impl/fs_newable.hpp>
#include <stratosphere/fs/fsa/fs_ifile.hpp>
#include <stratosphere/fs/fsa/fs_idirectory.hpp>
#include <stratosphere/fs/fsa/fs_ifilesystem.hpp>
namespace ams::fs {
namespace {
class ReadOnlyFile : public fsa::IFile, public impl::Newable {
NON_COPYABLE(ReadOnlyFile);
NON_MOVEABLE(ReadOnlyFile);
private:
std::unique_ptr<fsa::IFile> base_file;
public:
explicit ReadOnlyFile(std::unique_ptr<fsa::IFile> &&f) : base_file(std::move(f)) { /* ... */ }
virtual ~ReadOnlyFile() { /* ... */ }
private:
virtual Result ReadImpl(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) override final {
return this->base_file->Read(out, offset, buffer, size, option);
}
virtual Result GetSizeImpl(s64 *out) override final {
return this->base_file->GetSize(out);
}
virtual Result FlushImpl() override final {
return ResultSuccess();
}
virtual Result WriteImpl(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileA();
}
virtual Result SetSizeImpl(s64 size) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileA();
}
virtual Result OperateRangeImpl(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override final {
switch (op_id) {
case OperationId::InvalidateCache:
case OperationId::QueryRange:
return this->base_file->OperateRange(dst, dst_size, op_id, offset, size, src, src_size);
default:
return fs::ResultUnsupportedOperationInReadOnlyFileB();
}
}
public:
virtual sf::cmif::DomainObjectId GetDomainObjectId() const override {
return this->base_file->GetDomainObjectId();
}
};
}
template<typename T>
class ReadOnlyFileSystemTemplate : public fsa::IFileSystem, public impl::Newable {
NON_COPYABLE(ReadOnlyFileSystemTemplate);
NON_MOVEABLE(ReadOnlyFileSystemTemplate);
private:
T base_fs;
public:
explicit ReadOnlyFileSystemTemplate(T &&fs) : base_fs(std::move(fs)) { /* ... */ }
virtual ~ReadOnlyFileSystemTemplate() { /* ... */ }
private:
virtual Result OpenFileImpl(std::unique_ptr<fsa::IFile> *out_file, const char *path, OpenMode mode) override final {
/* Only allow opening files with mode = read. */
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R_UNLESS((mode & fs::OpenMode_All) == fs::OpenMode_Read, fs::ResultInvalidOpenMode());
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std::unique_ptr<fsa::IFile> base_file;
R_TRY(this->base_fs->OpenFile(std::addressof(base_file), path, mode));
auto read_only_file = std::make_unique<ReadOnlyFile>(std::move(base_file));
R_UNLESS(read_only_file != nullptr, fs::ResultAllocationFailureInReadOnlyFileSystemA());
*out_file = std::move(read_only_file);
return ResultSuccess();
}
virtual Result OpenDirectoryImpl(std::unique_ptr<fsa::IDirectory> *out_dir, const char *path, OpenDirectoryMode mode) override final {
return this->base_fs->OpenDirectory(out_dir, path, mode);
}
virtual Result GetEntryTypeImpl(DirectoryEntryType *out, const char *path) override final {
return this->base_fs->GetEntryType(out, path);
}
virtual Result CommitImpl() override final {
return ResultSuccess();
}
virtual Result CreateFileImpl(const char *path, s64 size, int flags) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result DeleteFileImpl(const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result CreateDirectoryImpl(const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result DeleteDirectoryImpl(const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result DeleteDirectoryRecursivelyImpl(const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result RenameFileImpl(const char *old_path, const char *new_path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result RenameDirectoryImpl(const char *old_path, const char *new_path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result CleanDirectoryRecursivelyImpl(const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateA();
}
virtual Result GetFreeSpaceSizeImpl(s64 *out, const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateB();
}
virtual Result GetTotalSpaceSizeImpl(s64 *out, const char *path) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateB();
}
virtual Result CommitProvisionallyImpl(s64 counter) override final {
return fs::ResultUnsupportedOperationInReadOnlyFileSystemTemplateC();
}
};
using ReadOnlyFileSystem = ReadOnlyFileSystemTemplate<std::unique_ptr<::ams::fs::fsa::IFileSystem>>;
using ReadOnlyFileSystemShared = ReadOnlyFileSystemTemplate<std::shared_ptr<::ams::fs::fsa::IFileSystem>>;
}