Atmosphere/fusee/program/source/fs/fusee_fs_file_storage.cpp

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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/>.
*/
#include <exosphere.hpp>
#include "fusee_fs_storage.hpp"
namespace ams::fs {
Result FileHandleStorage::UpdateSize() {
R_SUCCEED_IF(m_size != InvalidSize);
return GetFileSize(std::addressof(m_size), m_handle);
}
Result FileHandleStorage::Read(s64 offset, void *buffer, size_t size) {
/* Immediately succeed if there's nothing to read. */
R_SUCCEED_IF(size == 0);
/* Validate buffer. */
R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
/* Ensure our size is valid. */
R_TRY(this->UpdateSize());
/* Ensure our access is valid. */
R_UNLESS(IStorage::CheckAccessRange(offset, size, m_size), fs::ResultOutOfRange());
return ReadFile(m_handle, offset, buffer, size, fs::ReadOption());
}
Result FileHandleStorage::Write(s64 offset, const void *buffer, size_t size) {
/* Immediately succeed if there's nothing to write. */
R_SUCCEED_IF(size == 0);
/* Validate buffer. */
R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
/* Ensure our size is valid. */
R_TRY(this->UpdateSize());
/* Ensure our access is valid. */
R_UNLESS(IStorage::CheckAccessRange(offset, size, m_size), fs::ResultOutOfRange());
return WriteFile(m_handle, offset, buffer, size, fs::WriteOption());
}
Result FileHandleStorage::Flush() {
return FlushFile(m_handle);
}
Result FileHandleStorage::GetSize(s64 *out_size) {
R_TRY(this->UpdateSize());
*out_size = m_size;
return ResultSuccess();
}
Result FileHandleStorage::SetSize(s64 size) {
m_size = InvalidSize;
return SetFileSize(m_handle, size);
}
}