library/cpp/binsaver/blob_io.h


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#pragma once

#include "bin_saver.h"
#include "buffered_io.h"

#include <util/memory/blob.h>

class TYaBlobStream: public IBinaryStream { 
    TBlob Blob;
    i64 Pos;

    int WriteImpl(const void*, int) override { 
        Y_ASSERT(0);
        return 0;
    }
    int ReadImpl(void* userBuffer, int size) override { 
        if (size == 0)
            return 0;
        i64 res = Min<i64>(Blob.Length() - Pos, size);
        if (res)
            memcpy(userBuffer, ((const char*)Blob.Data()) + Pos, res);
        Pos += res;
        return res;
    }
    bool IsValid() const override { 
        return true; 
    } 
    bool IsFailed() const override { 
        return false; 
    } 
 
public:
    TYaBlobStream(const TBlob& blob) 
        : Blob(blob) 
        , Pos(0) 
    { 
    } 
};

template <class T> 
inline void SerializeBlob(const TBlob& data, T& c) { 
    TYaBlobStream f(data);
    {
        IBinSaver bs(f, true);
        bs.Add(1, &c);
    }
}