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#pragma once
#include <iostream>
namespace DB
{
/// StdIStreamFromMemory is used in WriteBufferFromS3 as a stream which is passed to the S3::Client
/// It provides istream interface (only reading) over the memory.
/// However S3::Client requires iostream interface it only reads from the stream
class StdIStreamFromMemory : public std::iostream
{
struct MemoryBuf: std::streambuf
{
MemoryBuf(char * begin_, size_t size_);
int_type underflow() override;
pos_type seekoff(off_type off, std::ios_base::seekdir way,
std::ios_base::openmode mode) override;
pos_type seekpos(pos_type sp,
std::ios_base::openmode mode) override;
char * begin = nullptr;
size_t size = 0;
};
MemoryBuf mem_buf;
public:
StdIStreamFromMemory(char * begin_, size_t size_);
};
}
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