filesystemAsset_v1.h

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//
// Copyright 2021 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
#ifndef INCLUDE_AR_FILESYSTEM_ASSET
#error This file should not be included directly. Include filesystemAsset.h instead.
#endif

#ifndef PXR_USD_AR_FILESYSTEM_ASSET_V1_H
#define PXR_USD_AR_FILESYSTEM_ASSET_V1_H


#include "pxr/pxr.h"
#include "pxr/usd/ar/api.h"
#include "pxr/usd/ar/asset.h"

#include <cstdio>
#include <memory>
#include <utility>

PXR_NAMESPACE_OPEN_SCOPE

class ArResolvedPath;

class ArFilesystemAsset
    : public ArAsset
{
public:
    AR_API
    static std::shared_ptr<ArFilesystemAsset> Open(
        const ArResolvedPath& resolvedPath);

    AR_API
    explicit ArFilesystemAsset(FILE* file);

    AR_API
    ~ArFilesystemAsset();

    AR_API
    virtual size_t GetSize() override;

    AR_API
    virtual std::shared_ptr<const char> GetBuffer() override;
    
    AR_API
    virtual size_t Read(void* buffer, size_t count, size_t offset) override;

    AR_API        
    virtual std::pair<FILE*, size_t> GetFileUnsafe() override;

private:
    FILE* _file;
};

PXR_NAMESPACE_CLOSE_SCOPE

#endif // PXR_USD_AR_FILESYSTEM_ASSET_V1_H