greenplumn CFileReader 源码
greenplumn CFileReader 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/io/CFileReader.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CFileReader.h
//
// @doc:
// File Reader
//---------------------------------------------------------------------------
#ifndef GPOS_CFileReader_H
#define GPOS_CFileReader_H
#include <fcntl.h>
#include "gpos/io/CFileDescriptor.h"
namespace gpos
{
//---------------------------------------------------------------------------
// @class:
// CFileReader
//
// @doc:
// Implementation of file handler for raw input;
// does not provide thread-safety
//
//---------------------------------------------------------------------------
class CFileReader : public CFileDescriptor
{
private:
// file size
ULLONG m_file_size{0};
// read size
ULLONG m_file_read_size{0};
public:
CFileReader(const CFileReader &) = delete;
// ctor
CFileReader();
// dtor
~CFileReader() override;
// get file size
ULLONG FileSize() const;
// get file read size
ULLONG FileReadSize() const;
// open file for reading
void Open(const CHAR *file_path, const ULONG permission_bits = S_IRUSR);
// close file
void Close();
// read bytes to buffer
ULONG_PTR ReadBytesToBuffer(BYTE *read_buffer,
const ULONG_PTR file_read_size);
}; // class CFileReader
} // namespace gpos
#endif // !GPOS_CFileReader_H
// EOF
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