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

175 lines
7.6 KiB
C++

/*
* Copyright (c) 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> m_base_file;
public:
explicit ReadOnlyFile(std::unique_ptr<fsa::IFile> &&f) : m_base_file(std::move(f)) { AMS_ASSERT(m_base_file != nullptr); }
virtual ~ReadOnlyFile() { /* ... */ }
private:
virtual Result DoRead(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) override final {
return m_base_file->Read(out, offset, buffer, size, option);
}
virtual Result DoGetSize(s64 *out) override final {
return m_base_file->GetSize(out);
}
virtual Result DoFlush() override final {
return ResultSuccess();
}
virtual Result DoWrite(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) override final {
bool need_append;
R_TRY(this->DryWrite(std::addressof(need_append), offset, size, option, fs::OpenMode_Read));
AMS_ASSERT(!need_append);
AMS_UNUSED(buffer);
return fs::ResultUnsupportedWriteForReadOnlyFile();
}
virtual Result DoSetSize(s64 size) override final {
R_TRY(this->DrySetSize(size, fs::OpenMode_Read));
return fs::ResultUnsupportedWriteForReadOnlyFile();
}
virtual Result DoOperateRange(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::Invalidate:
case OperationId::QueryRange:
return m_base_file->OperateRange(dst, dst_size, op_id, offset, size, src, src_size);
default:
return fs::ResultUnsupportedOperateRangeForReadOnlyFile();
}
}
public:
virtual sf::cmif::DomainObjectId GetDomainObjectId() const override {
return m_base_file->GetDomainObjectId();
}
};
}
template<typename T>
class ReadOnlyFileSystemTemplate : public fsa::IFileSystem, public impl::Newable {
NON_COPYABLE(ReadOnlyFileSystemTemplate);
NON_MOVEABLE(ReadOnlyFileSystemTemplate);
private:
T m_base_fs;
public:
explicit ReadOnlyFileSystemTemplate(T &&fs) : m_base_fs(std::move(fs)) { /* ... */ }
virtual ~ReadOnlyFileSystemTemplate() { /* ... */ }
private:
virtual Result DoOpenFile(std::unique_ptr<fsa::IFile> *out_file, const fs::Path &path, OpenMode mode) override final {
/* Only allow opening files with mode = read. */
R_UNLESS((mode & fs::OpenMode_All) == fs::OpenMode_Read, fs::ResultInvalidOpenMode());
std::unique_ptr<fsa::IFile> base_file;
R_TRY(m_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 DoOpenDirectory(std::unique_ptr<fsa::IDirectory> *out_dir, const fs::Path &path, OpenDirectoryMode mode) override final {
return m_base_fs->OpenDirectory(out_dir, path, mode);
}
virtual Result DoGetEntryType(DirectoryEntryType *out, const fs::Path &path) override final {
return m_base_fs->GetEntryType(out, path);
}
virtual Result DoCommit() override final {
return ResultSuccess();
}
virtual Result DoCreateFile(const fs::Path &path, s64 size, int flags) override final {
AMS_UNUSED(path, size, flags);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoDeleteFile(const fs::Path &path) override final {
AMS_UNUSED(path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoCreateDirectory(const fs::Path &path) override final {
AMS_UNUSED(path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoDeleteDirectory(const fs::Path &path) override final {
AMS_UNUSED(path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoDeleteDirectoryRecursively(const fs::Path &path) override final {
AMS_UNUSED(path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoRenameFile(const fs::Path &old_path, const fs::Path &new_path) override final {
AMS_UNUSED(old_path, new_path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoRenameDirectory(const fs::Path &old_path, const fs::Path &new_path) override final {
AMS_UNUSED(old_path, new_path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoCleanDirectoryRecursively(const fs::Path &path) override final {
AMS_UNUSED(path);
return fs::ResultUnsupportedWriteForReadOnlyFileSystem();
}
virtual Result DoGetFreeSpaceSize(s64 *out, const fs::Path &path) override final {
AMS_UNUSED(out, path);
return fs::ResultUnsupportedCommitProvisionallyForReadOnlyFileSystem();
}
virtual Result DoGetTotalSpaceSize(s64 *out, const fs::Path &path) override final {
AMS_UNUSED(out, path);
return fs::ResultUnsupportedCommitProvisionallyForReadOnlyFileSystem();
}
virtual Result DoCommitProvisionally(s64 counter) override final {
AMS_UNUSED(counter);
return fs::ResultUnsupportedGetTotalSpaceSizeForReadOnlyFileSystem();
}
};
using ReadOnlyFileSystem = ReadOnlyFileSystemTemplate<std::unique_ptr<::ams::fs::fsa::IFileSystem>>;
using ReadOnlyFileSystemShared = ReadOnlyFileSystemTemplate<std::shared_ptr<::ams::fs::fsa::IFileSystem>>;
}