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31 lines
681 B
C++
31 lines
681 B
C++
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#pragma once
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#include <string>
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#include <fcntl.h>
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#include <DB/IO/WriteBuffer.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 WriteBufferFromFileBase : public BufferWithOwnMemory<WriteBuffer>
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{
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public:
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WriteBufferFromFileBase(size_t buf_size, char * existing_memory, size_t alignment);
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virtual ~WriteBufferFromFileBase();
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off_t seek(off_t off, int whence = SEEK_SET);
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void truncate(off_t length = 0);
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virtual off_t getPositionInFile() = 0;
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virtual void sync() = 0;
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virtual std::string getFileName() const = 0;
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virtual int getFD() const = 0;
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protected:
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virtual off_t doSeek(off_t off, int whence) = 0;
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virtual void doTruncate(off_t length) = 0;
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};
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}
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