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46 lines
782 B
C++
46 lines
782 B
C++
#ifndef DBMS_COMMON_READBUFFER_FROM_ISTREAM_H
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#define DBMS_COMMON_READBUFFER_FROM_ISTREAM_H
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#include <iostream>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/BufferWithOwnMemory.h>
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namespace DB
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{
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class ReadBufferFromIStream : public BufferWithOwnMemory<ReadBuffer>
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{
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private:
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std::istream & istr;
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bool nextImpl()
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{
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istr.read(working_buffer.begin(), working_buffer.size());
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size_t gcount = istr.gcount();
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if (!gcount)
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{
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if (istr.eof())
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return false;
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else
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throw Exception("Cannot read from istream", ErrorCodes::CANNOT_READ_FROM_ISTREAM);
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}
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else
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working_buffer.resize(gcount);
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return true;
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}
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public:
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ReadBufferFromIStream(std::istream & istr_) : istr(istr_) {}
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};
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}
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#endif
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