library/cpp/blockcodecs/core/stream.h


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#pragma once

#include <util/stream/walk.h>
#include <util/stream/input.h>
#include <util/stream/output.h>
#include <util/stream/zerocopy.h>
#include <util/generic/buffer.h>

namespace NBlockCodecs {
    struct ICodec;

    class TCodedOutput: public IOutputStream { 
    public:
        TCodedOutput(IOutputStream* out, const ICodec* c, size_t bufLen); 
        ~TCodedOutput() override;

    private:
        void DoWrite(const void* buf, size_t len) override;
        void DoFlush() override;
        void DoFinish() override;

        bool FlushImpl();

    private:
        const ICodec* C_;
        TBuffer D_;
        TBuffer O_;
        IOutputStream* S_; 
    };

    class TDecodedInput: public IWalkInput { 
    public:
        TDecodedInput(IInputStream* in); 
        TDecodedInput(IInputStream* in, const ICodec* codec);

        ~TDecodedInput() override;

    private:
        size_t DoUnboundedNext(const void** ptr) override;

    private:
        TBuffer D_;
        IInputStream* S_; 
        const ICodec* C_;
    };
}