2020-05-11 23:04:51 +01:00
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/*
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2021-10-04 20:59:10 +01:00
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* Copyright (c) Atmosphère-NX
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2020-05-11 23:04:51 +01:00
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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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#include <stratosphere.hpp>
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namespace ams::fssystem {
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Result SparseStorage::Read(s64 offset, void *buffer, size_t size) {
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/* Validate preconditions. */
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AMS_ASSERT(offset >= 0);
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AMS_ASSERT(this->IsInitialized());
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/* Allow zero size. */
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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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if (this->GetEntryTable().IsEmpty()) {
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R_UNLESS(this->GetEntryTable().Includes(offset, size), fs::ResultOutOfRange());
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std::memset(buffer, 0, size);
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} else {
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R_TRY(this->OperatePerEntry<false>(offset, size, [=](fs::IStorage *storage, s64 data_offset, s64 cur_offset, s64 cur_size) -> Result {
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R_TRY(storage->Read(data_offset, reinterpret_cast<u8 *>(buffer) + (cur_offset - offset), static_cast<size_t>(cur_size)));
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return ResultSuccess();
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}));
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}
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return ResultSuccess();
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}
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}
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