mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-11-14 17:16:36 +00:00
145 lines
5.2 KiB
C++
145 lines
5.2 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 <exosphere.hpp>
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#include "fusee_fs_api.hpp"
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namespace ams::fs {
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class IStorage {
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public:
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virtual Result Read(s64 offset, void *buffer, size_t size) = 0;
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virtual Result Write(s64 offset, const void *buffer, size_t size) = 0;
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virtual Result Flush() = 0;
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virtual Result SetSize(s64 size) = 0;
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virtual Result GetSize(s64 *out) = 0;
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public:
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static inline bool CheckAccessRange(s64 offset, s64 size, s64 total_size) {
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return offset >= 0 &&
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size >= 0 &&
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size <= total_size &&
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offset <= (total_size - size);
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}
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static inline bool CheckAccessRange(s64 offset, size_t size, s64 total_size) {
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return CheckAccessRange(offset, static_cast<s64>(size), total_size);
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}
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static inline bool CheckOffsetAndSize(s64 offset, s64 size) {
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return offset >= 0 &&
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size >= 0 &&
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offset <= (offset + size);
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}
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static inline bool CheckOffsetAndSize(s64 offset, size_t size) {
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return CheckOffsetAndSize(offset, static_cast<s64>(size));
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}
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};
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class ReadOnlyStorageAdapter : public IStorage {
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private:
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IStorage &m_storage;
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public:
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ReadOnlyStorageAdapter(IStorage &s) : m_storage(s) { /* ... */ }
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virtual Result Read(s64 offset, void *buffer, size_t size) override {
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return m_storage.Read(offset, buffer, size);
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}
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virtual Result Flush() override {
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return m_storage.Flush();
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}
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virtual Result GetSize(s64 *out) override {
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return m_storage.GetSize(out);
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}
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virtual Result Write(s64 offset, const void *buffer, size_t size) override {
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return fs::ResultUnsupportedOperation();
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}
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virtual Result SetSize(s64 size) override {
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return fs::ResultUnsupportedOperation();
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}
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};
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class SubStorage : public IStorage {
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private:
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IStorage &m_storage;
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s64 m_offset;
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s64 m_size;
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public:
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SubStorage(IStorage &s, s64 o, s64 sz) : m_storage(s), m_offset(o), m_size(sz) { /* ... */ }
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virtual Result Read(s64 offset, void *buffer, size_t size) override {
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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_UNLESS(IStorage::CheckAccessRange(offset, size, m_size), fs::ResultOutOfRange());
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return m_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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/* 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_UNLESS(IStorage::CheckAccessRange(offset, size, m_size), fs::ResultOutOfRange());
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return m_storage.Write(m_offset + offset, buffer, size);
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}
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virtual Result Flush() override {
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return m_storage.Flush();
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}
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virtual Result GetSize(s64 *out) override {
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*out = m_size;
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return ResultSuccess();
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}
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virtual Result SetSize(s64 size) override {
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return fs::ResultUnsupportedOperationInSubStorageA();
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}
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};
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class FileHandleStorage : public IStorage {
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private:
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static constexpr s64 InvalidSize = -1;
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private:
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FileHandle m_handle;
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s64 m_size;
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public:
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constexpr explicit FileHandleStorage(FileHandle handle) : m_handle(handle), m_size(InvalidSize) { /* ... */ }
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~FileHandleStorage() { fs::CloseFile(m_handle); }
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protected:
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Result UpdateSize();
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public:
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virtual Result Read(s64 offset, void *buffer, size_t size) override;
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virtual Result Write(s64 offset, const void *buffer, size_t size) override;
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virtual Result Flush() override;
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virtual Result GetSize(s64 *out_size) override;
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virtual Result SetSize(s64 size) override;
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};
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}
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