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45 lines
799 B
C++
45 lines
799 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/Core/ReadBuffer.h>
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namespace DB
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{
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class ReadBufferFromIStream : public ReadBuffer
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{
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private:
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std::istream & istr;
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public:
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ReadBufferFromIStream(std::istream & istr_) : istr(istr_) {}
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bool next()
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{
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istr.read(internal_buffer, DEFAULT_READ_BUFFER_SIZE);
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pos = internal_buffer;
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working_buffer = Buffer(internal_buffer, internal_buffer + istr.gcount());
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if (working_buffer.end() == working_buffer.begin())
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{
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if (istr.eof())
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return false;
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if (!istr.good())
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throw Exception("Cannot read from istream", ErrorCodes::CANNOT_READ_FROM_ISTREAM);
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}
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return true;
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}
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};
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}
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#endif
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