Atmosphere/libraries/libstratosphere/source/ncm/ncm_package_system_downgrade_task.cpp

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/*
* Copyright (c) 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::ncm {
Result PackageSystemDowngradeTask::PreCommit() {
constexpr size_t MaxContentMetas = 0x40;
auto &data = this->GetInstallData();
/* Count the number of content meta entries. */
s32 count;
R_TRY(data.Count(std::addressof(count)));
/* Iterate over content meta. */
for (s32 i = 0; i < count; i++) {
/* Obtain the content meta. */
InstallContentMeta content_meta;
R_TRY(data.Get(std::addressof(content_meta), i));
/* Create a reader. */
const auto reader = content_meta.GetReader();
const auto key = reader.GetKey();
/* Obtain a list of suitable storage ids. */
const auto storage_list = GetStorageList(this->GetInstallStorage());
/* Iterate over storage ids. */
for (s32 i = 0; i < storage_list.Count(); i++) {
/* Open the content meta database. */
ContentMetaDatabase meta_db;
if (R_FAILED(OpenContentMetaDatabase(std::addressof(meta_db), storage_list[i]))) {
continue;
}
/* List keys matching the type and id of the install content meta key. */
ncm::ContentMetaKey keys[MaxContentMetas];
const auto count = meta_db.ListContentMeta(keys, MaxContentMetas, key.type, { key.id });
/* Remove matching keys. */
for (auto i = 0; i < count.total; i++) {
meta_db.Remove(keys[i]);
}
}
}
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R_SUCCEED();
}
Result PackageSystemDowngradeTask::Commit() {
R_TRY(this->PreCommit());
R_RETURN(InstallTaskBase::Commit());
}
Result PackageSystemDowngradeTask::PrepareContentMetaIfLatest(const ContentMetaKey &key) {
/* Get and prepare install content meta info. We aren't concerned if our key is older. */
InstallContentMetaInfo install_content_meta_info;
R_TRY(this->GetInstallContentMetaInfo(std::addressof(install_content_meta_info), key));
R_RETURN(this->PrepareContentMeta(install_content_meta_info, key, util::nullopt));
}
}