Atmosphere/libraries/libstratosphere/include/stratosphere/fs/fsa/fs_ifile.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 "../fs_common.hpp"
#include "../fs_file.hpp"
#include "../fs_filesystem.hpp"
#include "../fs_operate_range.hpp"
namespace ams::fs::fsa {
class IFile {
public:
virtual ~IFile() { /* ... */ }
Result Read(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) {
R_UNLESS(out != nullptr, fs::ResultNullptrArgument());
if (size == 0) {
*out = 0;
return ResultSuccess();
}
R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
R_UNLESS(offset >= 0, fs::ResultOutOfRange());
const s64 signed_size = static_cast<s64>(size);
R_UNLESS(signed_size >= 0, fs::ResultOutOfRange());
R_UNLESS((std::numeric_limits<s64>::max() - offset) >= signed_size, fs::ResultOutOfRange());
return this->ReadImpl(out, offset, buffer, size, option);
}
Result Read(size_t *out, s64 offset, void *buffer, size_t size) {
return this->Read(out, offset, buffer, size, ReadOption::None);
}
Result GetSize(s64 *out) {
R_UNLESS(out != nullptr, fs::ResultNullptrArgument());
return this->GetSizeImpl(out);
}
Result Flush() {
return this->FlushImpl();
}
Result Write(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) {
if (size == 0) {
if (option.HasFlushFlag()) {
R_TRY(this->Flush());
}
return ResultSuccess();
}
R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
R_UNLESS(offset >= 0, fs::ResultOutOfRange());
const s64 signed_size = static_cast<s64>(size);
R_UNLESS(signed_size >= 0, fs::ResultOutOfRange());
R_UNLESS((std::numeric_limits<s64>::max() - offset) >= signed_size, fs::ResultOutOfRange());
return this->WriteImpl(offset, buffer, size, option);
}
Result SetSize(s64 size) {
R_UNLESS(size >= 0, fs::ResultOutOfRange());
return this->SetSizeImpl(size);
}
Result OperateRange(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) {
return this->OperateRangeImpl(dst, dst_size, op_id, offset, size, src, src_size);
}
Result OperateRange(fs::OperationId op_id, s64 offset, s64 size) {
return this->OperateRangeImpl(nullptr, 0, op_id, offset, size, nullptr, 0);
}
public:
/* TODO: This is a hack to allow the mitm API to work. Find a better way? */
virtual sf::cmif::DomainObjectId GetDomainObjectId() const = 0;
protected:
Result DryRead(size_t *out, s64 offset, size_t size, const fs::ReadOption &option, OpenMode open_mode) {
/* Check that we can read. */
R_UNLESS((open_mode & OpenMode_Read) != 0, fs::ResultInvalidOperationForOpenMode());
/* Get the file size, and validate our offset. */
s64 file_size = 0;
R_TRY(this->GetSize(&file_size));
R_UNLESS(offset <= file_size, fs::ResultOutOfRange());
*out = static_cast<size_t>(std::min(file_size - offset, static_cast<s64>(size)));
return ResultSuccess();
}
Result DrySetSize(s64 size, OpenMode open_mode) {
/* Check that we can write. */
R_UNLESS((open_mode & OpenMode_Write) != 0, fs::ResultInvalidOperationForOpenMode());
return ResultSuccess();
}
private:
virtual Result ReadImpl(size_t *out, s64 offset, void *buffer, size_t size, const fs::ReadOption &option) = 0;
virtual Result GetSizeImpl(s64 *out) = 0;
virtual Result FlushImpl() = 0;
virtual Result WriteImpl(s64 offset, const void *buffer, size_t size, const fs::WriteOption &option) = 0;
virtual Result SetSizeImpl(s64 size) = 0;
virtual Result OperateRangeImpl(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) = 0;
};
}