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40 lines
865 B
C++
40 lines
865 B
C++
#pragma once
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#include <fcntl.h>
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#include <DB/IO/ReadBufferFromFileDescriptor.h>
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namespace DB
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{
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/** Принимает имя файла. Самостоятельно открывает и закрывает файл.
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*/
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class ReadBufferFromFile : public ReadBufferFromFileDescriptor
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{
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private:
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std::string file_name;
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public:
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ReadBufferFromFile(const std::string & file_name_, size_t buf_size = DBMS_DEFAULT_BUFFER_SIZE, char * existing_memory = NULL)
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: ReadBufferFromFileDescriptor(-1, buf_size, existing_memory), file_name(file_name_)
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{
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fd = open(file_name.c_str(), O_RDONLY);
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if (-1 == fd)
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throwFromErrno("Cannot open file " + file_name, errno == ENOENT ? ErrorCodes::FILE_DOESNT_EXIST : ErrorCodes::CANNOT_OPEN_FILE);
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}
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virtual ~ReadBufferFromFile()
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{
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close(fd);
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}
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virtual std::string getFileName()
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{
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return file_name;
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}
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};
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}
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