mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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155 lines
6.7 KiB
C++
155 lines
6.7 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <stratosphere/fs/impl/fs_newable.hpp>
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#include <stratosphere/fs/fs_istorage.hpp>
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namespace ams::fs {
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/* ACCURATE_TO_VERSION: Unknown */
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class SubStorage : public ::ams::fs::IStorage, public ::ams::fs::impl::Newable {
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private:
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std::shared_ptr<IStorage> m_shared_base_storage;
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fs::IStorage *m_base_storage;
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s64 m_offset;
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s64 m_size;
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bool m_resizable;
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private:
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constexpr bool IsValid() const {
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return m_base_storage != nullptr;
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}
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public:
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SubStorage() : m_shared_base_storage(), m_base_storage(nullptr), m_offset(0), m_size(0), m_resizable(false) { /* ... */ }
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SubStorage(const SubStorage &rhs) : m_shared_base_storage(rhs.m_shared_base_storage), m_base_storage(rhs.m_base_storage), m_offset(rhs.m_offset), m_size(rhs.m_size), m_resizable(rhs.m_resizable) { /* ... */}
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SubStorage &operator=(const SubStorage &rhs) {
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if (this != std::addressof(rhs)) {
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m_shared_base_storage = rhs.m_shared_base_storage;
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m_base_storage = rhs.m_base_storage;
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m_offset = rhs.m_offset;
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m_size = rhs.m_size;
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m_resizable = rhs.m_resizable;
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}
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return *this;
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}
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SubStorage(IStorage *storage, s64 o, s64 sz) : m_shared_base_storage(), m_base_storage(storage), m_offset(o), m_size(sz), m_resizable(false) {
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AMS_ABORT_UNLESS(this->IsValid());
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AMS_ABORT_UNLESS(m_offset >= 0);
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AMS_ABORT_UNLESS(m_size >= 0);
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}
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SubStorage(std::shared_ptr<IStorage> storage, s64 o, s64 sz) : m_shared_base_storage(storage), m_base_storage(storage.get()), m_offset(o), m_size(sz), m_resizable(false) {
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AMS_ABORT_UNLESS(this->IsValid());
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AMS_ABORT_UNLESS(m_offset >= 0);
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AMS_ABORT_UNLESS(m_size >= 0);
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}
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SubStorage(SubStorage *sub, s64 o, s64 sz) : m_shared_base_storage(sub->m_shared_base_storage), m_base_storage(sub->m_base_storage), m_offset(o + sub->m_offset), m_size(sz), m_resizable(false) {
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AMS_ABORT_UNLESS(this->IsValid());
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AMS_ABORT_UNLESS(m_offset >= 0);
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AMS_ABORT_UNLESS(m_size >= 0);
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AMS_ABORT_UNLESS(sub->m_size >= o + sz);
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}
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ALWAYS_INLINE ::ams::fs::IStorage *operator->() {
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return this;
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}
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public:
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void SetResizable(bool rsz) {
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m_resizable = rsz;
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}
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public:
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virtual Result Read(s64 offset, void *buffer, size_t size) override {
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/* Ensure we're initialized. */
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R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
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/* Succeed immediately on zero-sized operation. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments and read. */
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R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
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R_TRY(IStorage::CheckAccessRange(offset, size, m_size));
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R_RETURN(m_base_storage->Read(m_offset + offset, buffer, size));
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}
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virtual Result Write(s64 offset, const void *buffer, size_t size) override{
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/* Ensure we're initialized. */
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R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
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/* Succeed immediately on zero-sized operation. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments and write. */
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R_UNLESS(buffer != nullptr, fs::ResultNullptrArgument());
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R_TRY(IStorage::CheckAccessRange(offset, size, m_size));
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R_RETURN(m_base_storage->Write(m_offset + offset, buffer, size));
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}
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virtual Result Flush() override {
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R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
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R_RETURN(m_base_storage->Flush());
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}
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virtual Result SetSize(s64 size) override {
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/* Ensure we're initialized and validate arguments. */
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R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
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R_UNLESS(m_resizable, fs::ResultUnsupportedSetSizeForNotResizableSubStorage());
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R_TRY(IStorage::CheckOffsetAndSize(m_offset, size));
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/* Ensure that we're allowed to set size. */
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s64 cur_size;
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R_TRY(m_base_storage->GetSize(std::addressof(cur_size)));
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R_UNLESS(cur_size == m_offset + m_size, fs::ResultUnsupportedSetSizeForResizableSubStorage());
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/* Set the size. */
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R_TRY(m_base_storage->SetSize(m_offset + size));
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m_size = size;
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R_SUCCEED();
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}
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virtual Result GetSize(s64 *out) override {
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/* Ensure we're initialized. */
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R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
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*out = m_size;
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R_SUCCEED();
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}
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virtual Result OperateRange(void *dst, size_t dst_size, OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override {
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/* Ensure we're initialized. */
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R_UNLESS(this->IsValid(), fs::ResultNotInitialized());
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/* If we're not invalidating, sanity check arguments. */
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if (op_id != fs::OperationId::Invalidate) {
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/* Succeed immediately on zero-sized operation other than invalidate. */
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R_SUCCEED_IF(size == 0);
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/* Check access extents. */
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R_TRY(IStorage::CheckOffsetAndSize(offset, size));
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}
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/* Perform the operation. */
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R_RETURN(m_base_storage->OperateRange(dst, dst_size, op_id, m_offset + offset, size, src, src_size));
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}
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using IStorage::OperateRange;
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};
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}
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