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#pragma once
#include "zerocopy.h"
/**
* Zero-copy stream that simplifies implementation of derived classes.
*
* Derived classes must implement `DoUnboundedNext` method.
*/
class IWalkInput: public IZeroCopyInputFastReadTo {
public:
IWalkInput()
: Buf_(nullptr)
, Len_(0)
{
}
protected:
void DoUndo(size_t len) override;
size_t DoNext(const void** ptr, size_t len) override;
/**
* Returns the next data chunk from this input stream. There are no
* restrictions on the size of the data chunk.
*
* @param ptr[out] Pointer to the start of the data chunk.
* @returns Size of the returned data chunk, in bytes.
* Return value of zero signals end of stream.
*/
virtual size_t DoUnboundedNext(const void** ptr) = 0;
private:
const void* Buf_;
size_t Len_;
};
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