AndroidFileSystem.hpp

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/*
 *  Copyright 2019-2021 Diligent Graphics LLC
 *  Copyright 2015-2019 Egor Yusov
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  In no event and under no legal theory, whether in tort (including negligence), 
 *  contract, or otherwise, unless required by applicable law (such as deliberate 
 *  and grossly negligent acts) or agreed to in writing, shall any Contributor be
 *  liable for any damages, including any direct, indirect, special, incidental, 
 *  or consequential damages of any character arising as a result of this License or 
 *  out of the use or inability to use the software (including but not limited to damages 
 *  for loss of goodwill, work stoppage, computer failure or malfunction, or any and 
 *  all other commercial damages or losses), even if such Contributor has been advised 
 *  of the possibility of such damages.
 */
 
#pragma once
 
#include <memory>
#include <vector>
#include <fstream>
#include <android/asset_manager.h>
 
#include "../../Basic/interface/BasicFileSystem.hpp"
#include "../../../Primitives/interface/DataBlob.h"
 
struct ANativeActivity;
struct AAssetManager;
 
class AndroidFile : public BasicFile
{
public:
    AndroidFile(const FileOpenAttribs& OpenAttribs);
    ~AndroidFile();
 
    void Read(Diligent::IDataBlob* pData);
 
    bool Read(void* Data, size_t BufferSize);
 
    bool Write(const void* Data, size_t BufferSize);
 
    size_t GetSize() { return m_Size; }
 
    size_t GetPos();
 
    void SetPos(size_t Offset, FilePosOrigin Origin);
 
    static bool Open(const char* FileName, std::ifstream& IFS, AAsset*& AssetFile, size_t& Size);
 
private:
    std::ifstream m_IFS;
    AAsset*       m_AssetFile = nullptr;
    size_t        m_Size      = 0;
};
 
 
struct AndroidFileSystem : public BasicFileSystem
{
public:
 
    static void Init(struct ANativeActivity* NativeActivity,
                     const char*             NativeActivityClassName,
                     struct AAssetManager*   AssetManager);
 
 
    static AndroidFile*          OpenFile(const FileOpenAttribs& OpenAttribs);
    static inline Diligent::Char GetSlashSymbol() { return '/'; }
 
    static bool FileExists(const Diligent::Char* strFilePath);
    static bool PathExists(const Diligent::Char* strPath);
 
    static bool CreateDirectory(const Diligent::Char* strPath);
    static void ClearDirectory(const Diligent::Char* strPath);
    static void DeleteFile(const Diligent::Char* strPath);
 
    static std::vector<std::unique_ptr<FindFileData>> Search(const Diligent::Char* SearchPattern);
};