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); 
    } 
}