/*

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Open Asset Import Library (assimp)

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  copyright notice, this list of conditions and the

  following disclaimer.

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*/

/** @file aiFileIO -> IOSystem wrapper*/

#ifndef AI_CIOSYSTEM_H_INCLUDED

#define AI_CIOSYSTEM_H_INCLUDED

#include <assimp/cfileio.h>

#include <assimp/IOStream.hpp>

#include <assimp/IOSystem.hpp>

#include <assimp/ai_assert.h>

namespace Assimp {

class CIOSystemWrapper;

// ------------------------------------------------------------------------------------------------

/// @brief Custom IOStream implementation for the C-API-

// ------------------------------------------------------------------------------------------------

class CIOStreamWrapper final : public IOStream {

public:

    explicit CIOStreamWrapper(aiFile *pFile, CIOSystemWrapper *io);

    ~CIOStreamWrapper() override;

    size_t Read(void *pvBuffer, size_t pSize, size_t pCount) override;

    size_t Write(const void *pvBuffer, size_t pSize, size_t pCount) override;

    aiReturn Seek(size_t pOffset, aiOrigin pOrigin) override;

    size_t Tell(void) const override;

    size_t FileSize() const override;

    void Flush() override;

private:

    aiFile *mFile;

    CIOSystemWrapper *mIO;

};

inline CIOStreamWrapper::CIOStreamWrapper(aiFile *pFile, CIOSystemWrapper *io) :

        mFile(pFile),

        mIO(io) {

    ai_assert(io != nullptr);

}

// ------------------------------------------------------------------------------------------------

/// @brief Custom IO-System wrapper implementation for the C-API.

// ------------------------------------------------------------------------------------------------

class CIOSystemWrapper final : public IOSystem {

    friend class CIOStreamWrapper;

public:

    explicit CIOSystemWrapper(aiFileIO *pFile);

    ~CIOSystemWrapper() override = default;

    bool Exists(const char *pFile) const override;

    char getOsSeparator() const override;

    IOStream *Open(const char *pFile, const char *pMode = "rb") override;

    void Close(IOStream *pFile) override;

private:

    aiFileIO *mFileSystem;

};

inline CIOSystemWrapper::CIOSystemWrapper(aiFileIO *pFile) : mFileSystem(pFile) {

    ai_assert(pFile != nullptr);

}

} // namespace Assimp

#endif // AI_CIOSYSTEM_H_INCLUDED