mirror of
https://github.com/Atmosphere-NX/Atmosphere-libs.git
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89 lines
3.4 KiB
C++
89 lines
3.4 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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#include <stratosphere/fs/fs_query_range.hpp>
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namespace ams::fs {
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/* ACCURATE_TO_VERSION: Unknown */
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class MemoryStorage : public ::ams::fs::IStorage, public ::ams::fs::impl::Newable {
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private:
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u8 * const m_buf;
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const s64 m_size;
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public:
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MemoryStorage(void *b, s64 sz) : m_buf(static_cast<u8 *>(b)), m_size(sz) { /* .. */ }
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public:
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virtual Result Read(s64 offset, void *buffer, size_t size) override {
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/* Succeed immediately on zero-sized read. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments. */
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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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/* Copy from memory. */
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std::memcpy(buffer, m_buf + offset, size);
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R_SUCCEED();
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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 write. */
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R_SUCCEED_IF(size == 0);
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/* Validate arguments. */
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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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/* Copy to memory. */
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std::memcpy(m_buf + offset, buffer, size);
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R_SUCCEED();
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}
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virtual Result Flush() override {
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R_SUCCEED();
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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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R_SUCCEED();
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}
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virtual Result SetSize(s64 size) override {
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AMS_UNUSED(size);
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R_THROW(fs::ResultUnsupportedSetSizeForMemoryStorage());
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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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AMS_UNUSED(offset, size, src, src_size);
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switch (op_id) {
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case OperationId::Invalidate:
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R_SUCCEED();
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case OperationId::QueryRange:
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R_UNLESS(dst != nullptr, fs::ResultNullptrArgument());
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R_UNLESS(dst_size == sizeof(QueryRangeInfo), fs::ResultInvalidSize());
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reinterpret_cast<QueryRangeInfo *>(dst)->Clear();
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R_SUCCEED();
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default:
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R_THROW(fs::ResultUnsupportedOperateRangeForMemoryStorage());
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}
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}
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};
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}
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