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46 lines
1021 B
C++
46 lines
1021 B
C++
#pragma once
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#include <DB/IO/BufferWithOwnMemory.h>
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#include <DB/IO/WriteBuffer.h>
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/// Так как HexWriteBuffer часто создаётся во внутреннем цикле, сделаем у него размер буфера маленьким.
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#define DBMS_HEX_WRITE_BUFFER_SIZE 32
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namespace DB
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{
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/** Всё что в него пишут, переводит в HEX (большими буквами) и пишет в другой WriteBuffer.
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*/
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class HexWriteBuffer : public WriteBuffer
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{
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protected:
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char buf[DBMS_HEX_WRITE_BUFFER_SIZE];
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WriteBuffer & out;
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void nextImpl()
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{
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if (!offset())
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return;
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for (Position p = working_buffer.begin(); p != pos; ++p)
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{
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out.write("0123456789ABCDEF"[static_cast<unsigned char>(*p) >> 4]);
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out.write("0123456789ABCDEF"[static_cast<unsigned char>(*p) & 0xF]);
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}
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}
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public:
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HexWriteBuffer(WriteBuffer & out_) : WriteBuffer(buf, sizeof(buf)), out(out_) {}
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~HexWriteBuffer()
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{
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if (!std::uncaught_exception())
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nextImpl();
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}
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};
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}
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