Atmosphere/libraries/libstratosphere/source/fs/fs_file_storage.cpp
Adubbz 0c161a4c1b
fs: implement FileHandleStorage (#857)
* fs: implement FileHandleStorage

* fs: merge FileHandleStorage into file_storage TU

Co-authored-by: Michael Scire <SciresM@gmail.com>
2020-03-27 11:45:02 -07:00

165 lines
5.8 KiB
C++

/*
* 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 <stratosphere.hpp>
namespace ams::fs {
Result FileStorage::UpdateSize() {
R_SUCCEED_IF(this->size != InvalidSize);
return this->base_file->GetSize(&this->size);
}
Result FileStorage::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::IsRangeValid(offset, size, this->size), fs::ResultOutOfRange());
size_t read_size;
return this->base_file->Read(&read_size, offset, buffer, size);
}
Result FileStorage::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::IsRangeValid(offset, size, this->size), fs::ResultOutOfRange());
return this->base_file->Write(offset, buffer, size, fs::WriteOption());
}
Result FileStorage::Flush() {
return this->base_file->Flush();
}
Result FileStorage::GetSize(s64 *out_size) {
R_TRY(this->UpdateSize());
*out_size = this->size;
return ResultSuccess();
}
Result FileStorage::SetSize(s64 size) {
this->size = InvalidSize;
return this->base_file->SetSize(size);
}
Result FileStorage::OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) {
switch (op_id) {
case OperationId::InvalidateCache:
case OperationId::QueryRange:
if (size == 0) {
if (op_id == OperationId::QueryRange) {
R_UNLESS(dst != nullptr, fs::ResultNullptrArgument());
R_UNLESS(dst_size == sizeof(QueryRangeInfo), fs::ResultInvalidSize());
reinterpret_cast<QueryRangeInfo *>(dst)->Clear();
}
return ResultSuccess();
}
R_TRY(this->UpdateSize());
R_UNLESS(IStorage::IsOffsetAndSizeValid(offset, size), fs::ResultOutOfRange());
return this->base_file->OperateRange(dst, dst_size, op_id, offset, size, src, src_size);
default:
return fs::ResultUnsupportedOperationInFileStorageA();
}
}
Result FileHandleStorage::UpdateSize() {
R_SUCCEED_IF(this->size != InvalidSize);
return GetFileSize(std::addressof(this->size), this->handle);
}
Result FileHandleStorage::Read(s64 offset, void *buffer, size_t size) {
/* Lock the mutex. */
std::scoped_lock lk(this->mutex);
/* 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::IsRangeValid(offset, size, this->size), fs::ResultOutOfRange());
return ReadFile(this->handle, offset, buffer, size, fs::ReadOption());
}
Result FileHandleStorage::Write(s64 offset, const void *buffer, size_t size) {
/* Lock the mutex. */
std::scoped_lock lk(this->mutex);
/* 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::IsRangeValid(offset, size, this->size), fs::ResultOutOfRange());
return WriteFile(this->handle, offset, buffer, size, fs::WriteOption());
}
Result FileHandleStorage::Flush() {
return FlushFile(this->handle);
}
Result FileHandleStorage::GetSize(s64 *out_size) {
R_TRY(this->UpdateSize());
*out_size = this->size;
return ResultSuccess();
}
Result FileHandleStorage::SetSize(s64 size) {
this->size = InvalidSize;
return SetFileSize(this->handle, size);
}
Result FileHandleStorage::OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) {
switch (op_id) {
case OperationId::QueryRange:
/* Validate buffer and size. */
R_UNLESS(dst != nullptr, fs::ResultNullptrArgument());
R_UNLESS(dst_size == sizeof(QueryRangeInfo), fs::ResultInvalidSize());
return QueryRange(static_cast<QueryRangeInfo *>(dst), this->handle, offset, size);
default:
return fs::ResultUnsupportedOperationInFileStorageB();
}
}
}