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Atmosphere/libraries/libstratosphere/source/ncm/ncm_placeholder_accessor.hpp
2022-03-23 09:10:50 -07:00

78 lines
3.4 KiB
C++

/*
* 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/>.
*/
#pragma once
#include <stratosphere.hpp>
namespace ams::ncm {
class PlaceHolderAccessor {
private:
struct CacheEntry {
PlaceHolderId id;
fs::FileHandle handle;
u64 counter;
};
static constexpr size_t MaxCacheEntries = 0x2;
private:
std::array<CacheEntry, MaxCacheEntries> m_caches;
PathString *m_root_path;
u64 m_cur_counter;
os::SdkMutex m_cache_mutex;
MakePlaceHolderPathFunction m_make_placeholder_path_func;
bool m_delay_flush;
private:
Result Open(fs::FileHandle *out_handle, PlaceHolderId placeholder_id);
bool LoadFromCache(fs::FileHandle *out_handle, PlaceHolderId placeholder_id);
void StoreToCache(PlaceHolderId placeholder_id, fs::FileHandle handle);
void Invalidate(CacheEntry *entry);
CacheEntry *FindInCache(PlaceHolderId placeholder_id);
CacheEntry *GetFreeEntry();;
public:
PlaceHolderAccessor() : m_root_path(nullptr), m_cur_counter(0), m_cache_mutex(), m_make_placeholder_path_func(nullptr), m_delay_flush(false) {
for (size_t i = 0; i < MaxCacheEntries; i++) {
m_caches[i].id = InvalidPlaceHolderId;
}
}
~PlaceHolderAccessor() { this->InvalidateAll(); }
static void MakeBaseDirectoryPath(PathString *out, const char *root_path);
static Result GetPlaceHolderIdFromFileName(PlaceHolderId *out, const char *name);
public:
/* API. */
void Initialize(PathString *root, MakePlaceHolderPathFunction path_func, bool delay_flush) {
m_root_path = root;
m_make_placeholder_path_func = path_func;
m_delay_flush = delay_flush;
}
Result CreatePlaceHolderFile(PlaceHolderId placeholder_id, s64 size);
Result DeletePlaceHolderFile(PlaceHolderId placeholder_id);
Result WritePlaceHolderFile(PlaceHolderId placeholder_id, s64 offset, const void *buffer, size_t size);
Result SetPlaceHolderFileSize(PlaceHolderId placeholder_id, s64 size);
Result TryGetPlaceHolderFileSize(bool *out_found, s64 *out_size, PlaceHolderId placeholder_id);
void GetPath(PathString *out_placeholder_path, PlaceHolderId placeholder_id);
void MakePath(PathString *out_placeholder_path, PlaceHolderId placeholder_id) const;
void InvalidateAll();
Result EnsurePlaceHolderDirectory(PlaceHolderId placeholder_id);
size_t GetHierarchicalDirectoryDepth() const { return GetHierarchicalPlaceHolderDirectoryDepth(m_make_placeholder_path_func); }
};
}