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#pragma once
#include "Stream.h"
#include <functional>
namespace cru::io {
struct ProxyStreamHandlers {
std::function<Index(Index offset, Stream::SeekOrigin origin)> seek;
std::function<Index(std::byte* buffer, Index offset, Index size)> read;
std::function<Index(const std::byte* buffer, Index offset, Index size)> write;
std::function<void()> flush;
/**
* @brief This method will be only called once when `Close` is called or the
* stream is destructed.
*/
std::function<void()> close;
};
class ProxyStream : public Stream {
public:
explicit ProxyStream(ProxyStreamHandlers handlers);
CRU_DELETE_COPY(ProxyStream)
CRU_DELETE_MOVE(ProxyStream)
~ProxyStream() override;
public:
bool CanSeek() override;
Index Seek(Index offset, SeekOrigin origin = SeekOrigin::Current) override;
bool CanRead() override;
Index Read(std::byte* buffer, Index offset, Index size) override;
bool CanWrite() override;
Index Write(const std::byte* buffer, Index offset, Index size) override;
void Flush() override;
void Close() override;
private:
void DoClose();
private:
bool closed_;
ProxyStreamHandlers handlers_;
};
} // namespace cru::io
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